* [PATCH][PPC32] Add PPC4xx DMA engine library
@ 2004-08-06 23:26 Matt Porter
0 siblings, 0 replies; only message in thread
From: Matt Porter @ 2004-08-06 23:26 UTC (permalink / raw)
To: akpm; +Cc: linux-kernel, linuxppc-dev
Adds a cleaned up version of the PPC4xx DMA engine library. Converted
to new DCR access method and DMA API.
Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
diff -Nru a/arch/ppc/platforms/4xx/Kconfig b/arch/ppc/platforms/4xx/Kconfig
--- a/arch/ppc/platforms/4xx/Kconfig Fri Aug 6 16:24:56 2004
+++ b/arch/ppc/platforms/4xx/Kconfig Fri Aug 6 16:24:56 2004
@@ -175,6 +175,15 @@
depends on ASH || BUBINGA || REDWOOD_5 || REDWOOD_6 || SYCAMORE || WALNUT
default y
+config PPC4xx_DMA
+ bool "PPC4xx DMA controller support"
+ depends on 4xx
+
+config PPC4xx_EDMA
+ bool
+ depends on !STB03xxx && PPC4xx_DMA
+ default y
+
config PM
bool "Power Management support (EXPERIMENTAL)"
depends on 4xx && EXPERIMENTAL
diff -Nru a/arch/ppc/syslib/Makefile b/arch/ppc/syslib/Makefile
--- a/arch/ppc/syslib/Makefile Fri Aug 6 16:24:56 2004
+++ b/arch/ppc/syslib/Makefile Fri Aug 6 16:24:56 2004
@@ -25,7 +25,8 @@
obj-$(CONFIG_4xx) += ppc4xx_pic.o
obj-$(CONFIG_40x) += ppc4xx_setup.o
obj-$(CONFIG_GEN_RTC) += todc_time.o
-obj-$(CONFIG_KGDB) += ppc4xx_kgdb.o
+obj-$(CONFIG_PPC4xx_DMA) += ppc4xx_dma.o
+obj-$(CONFIG_PPC4xx_EDMA) += ppc4xx_sgdma.o
ifeq ($(CONFIG_40x),y)
obj-$(CONFIG_KGDB) += ppc4xx_kgdb.o
obj-$(CONFIG_PCI) += indirect_pci.o pci_auto.o ppc405_pci.o
diff -Nru a/arch/ppc/syslib/ppc4xx_dma.c b/arch/ppc/syslib/ppc4xx_dma.c
--- a/arch/ppc/syslib/ppc4xx_dma.c Fri Aug 6 16:24:56 2004
+++ b/arch/ppc/syslib/ppc4xx_dma.c Fri Aug 6 16:24:56 2004
@@ -1,42 +1,427 @@
/*
- * Author: Pete Popov <ppopov@mvista.com> or source@mvista.com
+ * arch/ppc/kernel/ppc4xx_dma.c
*
- * arch/ppc/kernel/ppc405_dma.c
+ * IBM PPC4xx DMA engine core library
*
- * 2000 (c) MontaVista, Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
+ * Copyright 2000-2004 MontaVista Software Inc.
*
- * IBM 405 DMA Controller Functions
+ * Cleaned up and converted to new DCR access
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Original code by Armin Kuster <akuster@mvista.com>
+ * and Pete Popov <ppopov@mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/config.h>
#include <linux/kernel.h>
-#include <asm/system.h>
-#include <asm/io.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
#include <linux/module.h>
-#include <asm/ppc405_dma.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/ppc4xx_dma.h>
+
+ppc_dma_ch_t dma_channels[MAX_PPC4xx_DMA_CHANNELS];
+
+int
+ppc4xx_get_dma_status(void)
+{
+ return (mfdcr(DCRN_DMASR));
+}
+
+void
+ppc4xx_set_src_addr(int dmanr, phys_addr_t src_addr)
+{
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("set_src_addr: bad channel: %d\n", dmanr);
+ return;
+ }
+
+#ifdef PPC4xx_DMA64BIT
+ mtdcr(DCRN_DMASAH0 + dmanr*2, (u32)(src_addr >> 32));
+#else
+ mtdcr(DCRN_DMASA0 + dmanr*2, (u32)src_addr);
+#endif
+}
+
+void
+ppc4xx_set_dst_addr(int dmanr, phys_addr_t dst_addr)
+{
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("set_dst_addr: bad channel: %d\n", dmanr);
+ return;
+ }
+
+#ifdef PPC4xx_DMA64BIT
+ mtdcr(DCRN_DMADAH0 + dmanr*2, (u32)(dst_addr >> 32));
+#else
+ mtdcr(DCRN_DMADA0 + dmanr*2, (u32)dst_addr);
+#endif
+}
+
+void
+ppc4xx_enable_dma(unsigned int dmanr)
+{
+ unsigned int control;
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+ unsigned int status_bits[] = { DMA_CS0 | DMA_TS0 | DMA_CH0_ERR,
+ DMA_CS1 | DMA_TS1 | DMA_CH1_ERR,
+ DMA_CS2 | DMA_TS2 | DMA_CH2_ERR,
+ DMA_CS3 | DMA_TS3 | DMA_CH3_ERR};
+
+ if (p_dma_ch->in_use) {
+ printk("enable_dma: channel %d in use\n", dmanr);
+ return;
+ }
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("enable_dma: bad channel: %d\n", dmanr);
+ return;
+ }
+
+ if (p_dma_ch->mode == DMA_MODE_READ) {
+ /* peripheral to memory */
+ ppc4xx_set_src_addr(dmanr, 0);
+ ppc4xx_set_dst_addr(dmanr, p_dma_ch->addr);
+ } else if (p_dma_ch->mode == DMA_MODE_WRITE) {
+ /* memory to peripheral */
+ ppc4xx_set_src_addr(dmanr, p_dma_ch->addr);
+ ppc4xx_set_dst_addr(dmanr, 0);
+ }
+
+ /* for other xfer modes, the addresses are already set */
+ control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
+
+ control &= ~(DMA_TM_MASK | DMA_TD); /* clear all mode bits */
+ if (p_dma_ch->mode == DMA_MODE_MM) {
+ /* software initiated memory to memory */
+ control |= DMA_ETD_OUTPUT | DMA_TCE_ENABLE;
+ }
+
+ mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);
+
+ /*
+ * Clear the CS, TS, RI bits for the channel from DMASR. This
+ * has been observed to happen correctly only after the mode and
+ * ETD/DCE bits in DMACRx are set above. Must do this before
+ * enabling the channel.
+ */
+
+ mtdcr(DCRN_DMASR, status_bits[dmanr]);
+
+ /*
+ * For device-paced transfers, Terminal Count Enable apparently
+ * must be on, and this must be turned on after the mode, etc.
+ * bits are cleared above (at least on Redwood-6).
+ */
+
+ if ((p_dma_ch->mode == DMA_MODE_MM_DEVATDST) ||
+ (p_dma_ch->mode == DMA_MODE_MM_DEVATSRC))
+ control |= DMA_TCE_ENABLE;
+
+ /*
+ * Now enable the channel.
+ */
+
+ control |= (p_dma_ch->mode | DMA_CE_ENABLE);
+
+ mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);
+
+ p_dma_ch->in_use = 1;
+}
+
+void
+ppc4xx_disable_dma(unsigned int dmanr)
+{
+ unsigned int control;
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+
+ if (!p_dma_ch->in_use) {
+ printk("disable_dma: channel %d not in use\n", dmanr);
+ return;
+ }
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("disable_dma: bad channel: %d\n", dmanr);
+ return;
+ }
+
+ control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
+ control &= ~DMA_CE_ENABLE;
+ mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);
+
+ p_dma_ch->in_use = 0;
+}
+
+/*
+ * Sets the dma mode for single DMA transfers only.
+ * For scatter/gather transfers, the mode is passed to the
+ * alloc_dma_handle() function as one of the parameters.
+ *
+ * The mode is simply saved and used later. This allows
+ * the driver to call set_dma_mode() and set_dma_addr() in
+ * any order.
+ *
+ * Valid mode values are:
+ *
+ * DMA_MODE_READ peripheral to memory
+ * DMA_MODE_WRITE memory to peripheral
+ * DMA_MODE_MM memory to memory
+ * DMA_MODE_MM_DEVATSRC device-paced memory to memory, device at src
+ * DMA_MODE_MM_DEVATDST device-paced memory to memory, device at dst
+ */
+int
+ppc4xx_set_dma_mode(unsigned int dmanr, unsigned int mode)
+{
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("set_dma_mode: bad channel 0x%x\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+
+ p_dma_ch->mode = mode;
+
+ return DMA_STATUS_GOOD;
+}
+/*
+ * Sets the DMA Count register. Note that 'count' is in bytes.
+ * However, the DMA Count register counts the number of "transfers",
+ * where each transfer is equal to the bus width. Thus, count
+ * MUST be a multiple of the bus width.
+ */
+void
+ppc4xx_set_dma_count(unsigned int dmanr, unsigned int count)
+{
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+
+#ifdef DEBUG_4xxDMA
+ {
+ int error = 0;
+ switch (p_dma_ch->pwidth) {
+ case PW_8:
+ break;
+ case PW_16:
+ if (count & 0x1)
+ error = 1;
+ break;
+ case PW_32:
+ if (count & 0x3)
+ error = 1;
+ break;
+ case PW_64:
+ if (count & 0x7)
+ error = 1;
+ break;
+ default:
+ printk("set_dma_count: invalid bus width: 0x%x\n",
+ p_dma_ch->pwidth);
+ return;
+ }
+ if (error)
+ printk
+ ("Warning: set_dma_count count 0x%x bus width %d\n",
+ count, p_dma_ch->pwidth);
+ }
+#endif
+
+ count = count >> p_dma_ch->shift;
+
+ mtdcr(DCRN_DMACT0 + (dmanr * 0x8), count);
+}
/*
- * Function prototypes
+ * Returns the number of bytes left to be transfered.
+ * After a DMA transfer, this should return zero.
+ * Reading this while a DMA transfer is still in progress will return
+ * unpredictable results.
*/
+int
+ppc4xx_get_dma_residue(unsigned int dmanr)
+{
+ unsigned int count;
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-int hw_init_dma_channel(unsigned int, ppc_dma_ch_t *);
-int init_dma_channel(unsigned int);
-int get_channel_config(unsigned int, ppc_dma_ch_t *);
-int set_channel_priority(unsigned int, unsigned int);
-unsigned int get_peripheral_width(unsigned int);
-int alloc_dma_handle(sgl_handle_t *, unsigned int, unsigned int);
-void free_dma_handle(sgl_handle_t);
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_get_dma_residue: bad channel 0x%x\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+ count = mfdcr(DCRN_DMACT0 + (dmanr * 0x8));
-ppc_dma_ch_t dma_channels[MAX_405GP_DMA_CHANNELS];
+ return (count << p_dma_ch->shift);
+}
+
+/*
+ * Sets the DMA address for a memory to peripheral or peripheral
+ * to memory transfer. The address is just saved in the channel
+ * structure for now and used later in enable_dma().
+ */
+void
+ppc4xx_set_dma_addr(unsigned int dmanr, phys_addr_t addr)
+{
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_set_dma_addr: bad channel: %d\n", dmanr);
+ return;
+ }
+
+#ifdef DEBUG_4xxDMA
+ {
+ int error = 0;
+ switch (p_dma_ch->pwidth) {
+ case PW_8:
+ break;
+ case PW_16:
+ if ((unsigned) addr & 0x1)
+ error = 1;
+ break;
+ case PW_32:
+ if ((unsigned) addr & 0x3)
+ error = 1;
+ break;
+ case PW_64:
+ if ((unsigned) addr & 0x7)
+ error = 1;
+ break;
+ default:
+ printk("ppc4xx_set_dma_addr: invalid bus width: 0x%x\n",
+ p_dma_ch->pwidth);
+ return;
+ }
+ if (error)
+ printk("Warning: ppc4xx_set_dma_addr addr 0x%x bus width %d\n",
+ addr, p_dma_ch->pwidth);
+ }
+#endif
+
+ /* save dma address and program it later after we know the xfer mode */
+ p_dma_ch->addr = addr;
+}
+
+/*
+ * Sets both DMA addresses for a memory to memory transfer.
+ * For memory to peripheral or peripheral to memory transfers
+ * the function set_dma_addr() should be used instead.
+ */
+void
+ppc4xx_set_dma_addr2(unsigned int dmanr, phys_addr_t src_dma_addr,
+ phys_addr_t dst_dma_addr)
+{
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_set_dma_addr2: bad channel: %d\n", dmanr);
+ return;
+ }
+
+#ifdef DEBUG_4xxDMA
+ {
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+ int error = 0;
+ switch (p_dma_ch->pwidth) {
+ case PW_8:
+ break;
+ case PW_16:
+ if (((unsigned) src_dma_addr & 0x1) ||
+ ((unsigned) dst_dma_addr & 0x1)
+ )
+ error = 1;
+ break;
+ case PW_32:
+ if (((unsigned) src_dma_addr & 0x3) ||
+ ((unsigned) dst_dma_addr & 0x3)
+ )
+ error = 1;
+ break;
+ case PW_64:
+ if (((unsigned) src_dma_addr & 0x7) ||
+ ((unsigned) dst_dma_addr & 0x7)
+ )
+ error = 1;
+ break;
+ default:
+ printk("ppc4xx_set_dma_addr2: invalid bus width: 0x%x\n",
+ p_dma_ch->pwidth);
+ return;
+ }
+ if (error)
+ printk
+ ("Warning: ppc4xx_set_dma_addr2 src 0x%x dst 0x%x bus width %d\n",
+ src_dma_addr, dst_dma_addr, p_dma_ch->pwidth);
+ }
+#endif
+
+ ppc4xx_set_src_addr(dmanr, src_dma_addr);
+ ppc4xx_set_dst_addr(dmanr, dst_dma_addr);
+}
+
+/*
+ * Enables the channel interrupt.
+ *
+ * If performing a scatter/gatter transfer, this function
+ * MUST be called before calling alloc_dma_handle() and building
+ * the sgl list. Otherwise, interrupts will not be enabled, if
+ * they were previously disabled.
+ */
+int
+ppc4xx_enable_dma_interrupt(unsigned int dmanr)
+{
+ unsigned int control;
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_enable_dma_interrupt: bad channel: %d\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+
+ p_dma_ch->int_enable = 1;
+
+ control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
+ control |= DMA_CIE_ENABLE; /* Channel Interrupt Enable */
+ mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);
+
+ return DMA_STATUS_GOOD;
+}
+
+/*
+ * Disables the channel interrupt.
+ *
+ * If performing a scatter/gatter transfer, this function
+ * MUST be called before calling alloc_dma_handle() and building
+ * the sgl list. Otherwise, interrupts will not be disabled, if
+ * they were previously enabled.
+ */
+int
+ppc4xx_disable_dma_interrupt(unsigned int dmanr)
+{
+ unsigned int control;
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_disable_dma_interrupt: bad channel: %d\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+
+ p_dma_ch->int_enable = 0;
+
+ control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
+ control &= ~DMA_CIE_ENABLE; /* Channel Interrupt Enable */
+ mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);
+
+ return DMA_STATUS_GOOD;
+}
/*
* Configures a DMA channel, including the peripheral bus width, if a
@@ -47,166 +432,112 @@
* called from platform specific init code. The driver should not need to
* call this function.
*/
-int hw_init_dma_channel(unsigned int dmanr, ppc_dma_ch_t *p_init)
+int
+ppc4xx_init_dma_channel(unsigned int dmanr, ppc_dma_ch_t * p_init)
{
- unsigned int polarity;
- uint32_t control = 0;
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-
-#ifdef DEBUG_405DMA
- if (!p_init) {
- printk("hw_init_dma_channel: NULL p_init\n");
- return DMA_STATUS_NULL_POINTER;
- }
- if (dmanr >= MAX_405GP_DMA_CHANNELS) {
- printk("hw_init_dma_channel: bad channel %d\n", dmanr);
- return DMA_STATUS_BAD_CHANNEL;
- }
-#endif
+ unsigned int polarity;
+ uint32_t control = 0;
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+
+ DMA_MODE_READ = (unsigned long) DMA_TD; /* Peripheral to Memory */
+ DMA_MODE_WRITE = 0; /* Memory to Peripheral */
+
+ if (!p_init) {
+ printk("ppc4xx_init_dma_channel: NULL p_init\n");
+ return DMA_STATUS_NULL_POINTER;
+ }
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_init_dma_channel: bad channel %d\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
#if DCRN_POL > 0
- polarity = mfdcr(DCRN_POL);
+ polarity = mfdcr(DCRN_POL);
#else
- polarity = 0;
+ polarity = 0;
#endif
- /* Setup the control register based on the values passed to
- * us in p_init. Then, over-write the control register with this
- * new value.
- */
-
- control |= (
- SET_DMA_CIE_ENABLE(p_init->int_enable) | /* interrupt enable */
- SET_DMA_BEN(p_init->buffer_enable) | /* buffer enable */
- SET_DMA_ETD(p_init->etd_output) | /* end of transfer pin */
- SET_DMA_TCE(p_init->tce_enable) | /* terminal count enable */
- SET_DMA_PL(p_init->pl) | /* peripheral location */
- SET_DMA_DAI(p_init->dai) | /* dest addr increment */
- SET_DMA_SAI(p_init->sai) | /* src addr increment */
- SET_DMA_PRIORITY(p_init->cp) | /* channel priority */
- SET_DMA_PW(p_init->pwidth) | /* peripheral/bus width */
- SET_DMA_PSC(p_init->psc) | /* peripheral setup cycles */
- SET_DMA_PWC(p_init->pwc) | /* peripheral wait cycles */
- SET_DMA_PHC(p_init->phc) | /* peripheral hold cycles */
- SET_DMA_PREFETCH(p_init->pf) /* read prefetch */
- );
-
- switch (dmanr) {
- case 0:
- /* clear all polarity signals and then "or" in new signal levels */
- polarity &= ~(DMAReq0_ActiveLow | DMAAck0_ActiveLow | EOT0_ActiveLow);
- polarity |= p_dma_ch->polarity;
-#if DCRN_POL > 0
- mtdcr(DCRN_POL, polarity);
-#endif
- mtdcr(DCRN_DMACR0, control);
- break;
- case 1:
- polarity &= ~(DMAReq1_ActiveLow | DMAAck1_ActiveLow | EOT1_ActiveLow);
- polarity |= p_dma_ch->polarity;
+ /* Setup the control register based on the values passed to
+ * us in p_init. Then, over-write the control register with this
+ * new value.
+ */
+ control |= SET_DMA_CONTROL;
+
+ /* clear all polarity signals and then "or" in new signal levels */
+ polarity &= ~GET_DMA_POLARITY(dmanr);
+ polarity |= p_dma_ch->polarity;
#if DCRN_POL > 0
- mtdcr(DCRN_POL, polarity);
+ mtdcr(DCRN_POL, polarity);
#endif
- mtdcr(DCRN_DMACR1, control);
- break;
- case 2:
- polarity &= ~(DMAReq2_ActiveLow | DMAAck2_ActiveLow | EOT2_ActiveLow);
- polarity |= p_dma_ch->polarity;
-#if DCRN_POL > 0
- mtdcr(DCRN_POL, polarity);
-#endif
- mtdcr(DCRN_DMACR2, control);
- break;
- case 3:
- polarity &= ~(DMAReq3_ActiveLow | DMAAck3_ActiveLow | EOT3_ActiveLow);
- polarity |= p_dma_ch->polarity;
-#if DCRN_POL > 0
- mtdcr(DCRN_POL, polarity);
-#endif
- mtdcr(DCRN_DMACR3, control);
- break;
- default:
- return DMA_STATUS_BAD_CHANNEL;
- }
-
- /* save these values in our dma channel structure */
- memcpy(p_dma_ch, p_init, sizeof(ppc_dma_ch_t));
-
- /*
- * The peripheral width values written in the control register are:
- * PW_8 0
- * PW_16 1
- * PW_32 2
- * PW_64 3
- *
- * Since the DMA count register takes the number of "transfers",
- * we need to divide the count sent to us in certain
- * functions by the appropriate number. It so happens that our
- * right shift value is equal to the peripheral width value.
- */
- p_dma_ch->shift = p_init->pwidth;
-
- /*
- * Save the control word for easy access.
- */
- p_dma_ch->control = control;
-
- mtdcr(DCRN_DMASR, 0xffffffff); /* clear status register */
- return DMA_STATUS_GOOD;
-}
+ mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);
+ /* save these values in our dma channel structure */
+ memcpy(p_dma_ch, p_init, sizeof (ppc_dma_ch_t));
+ /*
+ * The peripheral width values written in the control register are:
+ * PW_8 0
+ * PW_16 1
+ * PW_32 2
+ * PW_64 3
+ *
+ * Since the DMA count register takes the number of "transfers",
+ * we need to divide the count sent to us in certain
+ * functions by the appropriate number. It so happens that our
+ * right shift value is equal to the peripheral width value.
+ */
+ p_dma_ch->shift = p_init->pwidth;
+
+ /*
+ * Save the control word for easy access.
+ */
+ p_dma_ch->control = control;
+ mtdcr(DCRN_DMASR, 0xffffffff); /* clear status register */
+ return DMA_STATUS_GOOD;
+}
/*
* This function returns the channel configuration.
*/
-int get_channel_config(unsigned int dmanr, ppc_dma_ch_t *p_dma_ch)
+int
+ppc4xx_get_channel_config(unsigned int dmanr, ppc_dma_ch_t * p_dma_ch)
{
- unsigned int polarity;
- unsigned int control;
+ unsigned int polarity;
+ unsigned int control;
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_get_channel_config: bad channel %d\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
#if DCRN_POL > 0
- polarity = mfdcr(DCRN_POL);
+ polarity = mfdcr(DCRN_POL);
#else
- polarity = 0;
+ polarity = 0;
#endif
- switch (dmanr) {
- case 0:
- p_dma_ch->polarity =
- polarity & (DMAReq0_ActiveLow | DMAAck0_ActiveLow | EOT0_ActiveLow);
- control = mfdcr(DCRN_DMACR0);
- break;
- case 1:
- p_dma_ch->polarity =
- polarity & (DMAReq1_ActiveLow | DMAAck1_ActiveLow | EOT1_ActiveLow);
- control = mfdcr(DCRN_DMACR1);
- break;
- case 2:
- p_dma_ch->polarity =
- polarity & (DMAReq2_ActiveLow | DMAAck2_ActiveLow | EOT2_ActiveLow);
- control = mfdcr(DCRN_DMACR2);
- break;
- case 3:
- p_dma_ch->polarity =
- polarity & (DMAReq3_ActiveLow | DMAAck3_ActiveLow | EOT3_ActiveLow);
- control = mfdcr(DCRN_DMACR3);
- break;
- default:
- return DMA_STATUS_BAD_CHANNEL;
- }
-
- p_dma_ch->cp = GET_DMA_PRIORITY(control);
- p_dma_ch->pwidth = GET_DMA_PW(control);
- p_dma_ch->psc = GET_DMA_PSC(control);
- p_dma_ch->pwc = GET_DMA_PWC(control);
- p_dma_ch->phc = GET_DMA_PHC(control);
- p_dma_ch->pf = GET_DMA_PREFETCH(control);
- p_dma_ch->int_enable = GET_DMA_CIE_ENABLE(control);
- p_dma_ch->shift = GET_DMA_PW(control);
+ p_dma_ch->polarity = polarity & GET_DMA_POLARITY(dmanr);
+ control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
+
+ p_dma_ch->cp = GET_DMA_PRIORITY(control);
+ p_dma_ch->pwidth = GET_DMA_PW(control);
+ p_dma_ch->psc = GET_DMA_PSC(control);
+ p_dma_ch->pwc = GET_DMA_PWC(control);
+ p_dma_ch->phc = GET_DMA_PHC(control);
+ p_dma_ch->ce = GET_DMA_CE_ENABLE(control);
+ p_dma_ch->int_enable = GET_DMA_CIE_ENABLE(control);
+ p_dma_ch->shift = GET_DMA_PW(control);
- return DMA_STATUS_GOOD;
+#ifdef CONFIG_PPC4xx_EDMA
+ p_dma_ch->pf = GET_DMA_PREFETCH(control);
+#else
+ p_dma_ch->ch_enable = GET_DMA_CH(control);
+ p_dma_ch->ece_enable = GET_DMA_ECE(control);
+ p_dma_ch->tcd_disable = GET_DMA_TCD(control);
+#endif
+ return DMA_STATUS_GOOD;
}
/*
@@ -222,50 +553,28 @@
* PRIORITY_HIGH
*
*/
-int set_channel_priority(unsigned int dmanr, unsigned int priority)
+int
+ppc4xx_set_channel_priority(unsigned int dmanr, unsigned int priority)
{
- unsigned int control;
+ unsigned int control;
-#ifdef DEBUG_405DMA
- if ( (priority != PRIORITY_LOW) &&
- (priority != PRIORITY_MID_LOW) &&
- (priority != PRIORITY_MID_HIGH) &&
- (priority != PRIORITY_HIGH)) {
- printk("set_channel_priority: bad priority: 0x%x\n", priority);
- }
-#endif
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_set_channel_priority: bad channel %d\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
- switch (dmanr) {
- case 0:
- control = mfdcr(DCRN_DMACR0);
- control|= SET_DMA_PRIORITY(priority);
- mtdcr(DCRN_DMACR0, control);
- break;
- case 1:
- control = mfdcr(DCRN_DMACR1);
- control|= SET_DMA_PRIORITY(priority);
- mtdcr(DCRN_DMACR1, control);
- break;
- case 2:
- control = mfdcr(DCRN_DMACR2);
- control|= SET_DMA_PRIORITY(priority);
- mtdcr(DCRN_DMACR2, control);
- break;
- case 3:
- control = mfdcr(DCRN_DMACR3);
- control|= SET_DMA_PRIORITY(priority);
- mtdcr(DCRN_DMACR3, control);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("set_channel_priority: bad channel: %d\n", dmanr);
-#endif
- return DMA_STATUS_BAD_CHANNEL;
- }
- return DMA_STATUS_GOOD;
-}
+ if ((priority != PRIORITY_LOW) &&
+ (priority != PRIORITY_MID_LOW) &&
+ (priority != PRIORITY_MID_HIGH) && (priority != PRIORITY_HIGH)) {
+ printk("ppc4xx_set_channel_priority: bad priority: 0x%x\n", priority);
+ }
+ control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
+ control |= SET_DMA_PRIORITY(priority);
+ mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);
+ return DMA_STATUS_GOOD;
+}
/*
* Returns the width of the peripheral attached to this channel. This assumes
@@ -280,213 +589,36 @@
*
* The function returns 0 on error.
*/
-unsigned int get_peripheral_width(unsigned int dmanr)
+unsigned int
+ppc4xx_get_peripheral_width(unsigned int dmanr)
{
- unsigned int control;
-
- switch (dmanr) {
- case 0:
- control = mfdcr(DCRN_DMACR0);
- break;
- case 1:
- control = mfdcr(DCRN_DMACR1);
- break;
- case 2:
- control = mfdcr(DCRN_DMACR2);
- break;
- case 3:
- control = mfdcr(DCRN_DMACR3);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("get_peripheral_width: bad channel: %d\n", dmanr);
-#endif
- return 0;
- }
- return(GET_DMA_PW(control));
-}
-
-
-
-
-/*
- * Create a scatter/gather list handle. This is simply a structure which
- * describes a scatter/gather list.
- *
- * A handle is returned in "handle" which the driver should save in order to
- * be able to access this list later. A chunk of memory will be allocated
- * to be used by the API for internal management purposes, including managing
- * the sg list and allocating memory for the sgl descriptors. One page should
- * be more than enough for that purpose. Perhaps it's a bit wasteful to use
- * a whole page for a single sg list, but most likely there will be only one
- * sg list per channel.
- *
- * Interrupt notes:
- * Each sgl descriptor has a copy of the DMA control word which the DMA engine
- * loads in the control register. The control word has a "global" interrupt
- * enable bit for that channel. Interrupts are further qualified by a few bits
- * in the sgl descriptor count register. In order to setup an sgl, we have to
- * know ahead of time whether or not interrupts will be enabled at the completion
- * of the transfers. Thus, enable_dma_interrupt()/disable_dma_interrupt() MUST
- * be called before calling alloc_dma_handle(). If the interrupt mode will never
- * change after powerup, then enable_dma_interrupt()/disable_dma_interrupt()
- * do not have to be called -- interrupts will be enabled or disabled based
- * on how the channel was configured after powerup by the hw_init_dma_channel()
- * function. Each sgl descriptor will be setup to interrupt if an error occurs;
- * however, only the last descriptor will be setup to interrupt. Thus, an
- * interrupt will occur (if interrupts are enabled) only after the complete
- * sgl transfer is done.
- */
-int alloc_dma_handle(sgl_handle_t *phandle, unsigned int mode, unsigned int dmanr)
-{
- sgl_list_info_t *psgl;
- dma_addr_t dma_addr;
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
- uint32_t sg_command;
- void *ret;
-
-#ifdef DEBUG_405DMA
- if (!phandle) {
- printk("alloc_dma_handle: null handle pointer\n");
- return DMA_STATUS_NULL_POINTER;
- }
- switch (mode) {
- case DMA_MODE_READ:
- case DMA_MODE_WRITE:
- case DMA_MODE_MM:
- case DMA_MODE_MM_DEVATSRC:
- case DMA_MODE_MM_DEVATDST:
- break;
- default:
- printk("alloc_dma_handle: bad mode 0x%x\n", mode);
- return DMA_STATUS_BAD_MODE;
- }
- if (dmanr >= MAX_405GP_DMA_CHANNELS) {
- printk("alloc_dma_handle: invalid channel 0x%x\n", dmanr);
- return DMA_STATUS_BAD_CHANNEL;
- }
-#endif
+ unsigned int control;
- /* Get a page of memory, which is zeroed out by pci_alloc_consistent() */
-
-/* wrong not a pci device - armin */
- /* psgl = (sgl_list_info_t *) pci_alloc_consistent(NULL, SGL_LIST_SIZE, &dma_addr);
-*/
-
- ret = consistent_alloc(GFP_ATOMIC |GFP_DMA, SGL_LIST_SIZE, &dma_addr);
- if (ret != NULL) {
- memset(ret, 0,SGL_LIST_SIZE );
- psgl = (sgl_list_info_t *) ret;
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_get_peripheral_width: bad channel %d\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
}
+ control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
- if (psgl == NULL) {
- *phandle = (sgl_handle_t)NULL;
- return DMA_STATUS_OUT_OF_MEMORY;
- }
-
- psgl->dma_addr = dma_addr;
- psgl->dmanr = dmanr;
-
- /*
- * Modify and save the control word. These word will get written to each sgl
- * descriptor. The DMA engine then loads this control word into the control
- * register every time it reads a new descriptor.
- */
- psgl->control = p_dma_ch->control;
- psgl->control &= ~(DMA_TM_MASK | DMA_TD); /* clear all "mode" bits first */
- psgl->control |= (mode | DMA_CH_ENABLE); /* save the control word along with the mode */
-
- if (p_dma_ch->int_enable) {
- psgl->control |= DMA_CIE_ENABLE; /* channel interrupt enabled */
- }
- else {
- psgl->control &= ~DMA_CIE_ENABLE;
- }
-
-#if DCRN_ASGC > 0
- sg_command = mfdcr(DCRN_ASGC);
- switch (dmanr) {
- case 0:
- sg_command |= SSG0_MASK_ENABLE;
- break;
- case 1:
- sg_command |= SSG1_MASK_ENABLE;
- break;
- case 2:
- sg_command |= SSG2_MASK_ENABLE;
- break;
- case 3:
- sg_command |= SSG3_MASK_ENABLE;
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("alloc_dma_handle: bad channel: %d\n", dmanr);
-#endif
- free_dma_handle((sgl_handle_t)psgl);
- *phandle = (sgl_handle_t)NULL;
- return DMA_STATUS_BAD_CHANNEL;
- }
-
- mtdcr(DCRN_ASGC, sg_command); /* enable writing to this channel's sgl control bits */
-#else
- (void)sg_command;
-#endif
- psgl->sgl_control = SG_ERI_ENABLE | SG_LINK; /* sgl descriptor control bits */
-
- if (p_dma_ch->int_enable) {
- if (p_dma_ch->tce_enable)
- psgl->sgl_control |= SG_TCI_ENABLE;
- else
- psgl->sgl_control |= SG_ETI_ENABLE;
- }
-
- *phandle = (sgl_handle_t)psgl;
- return DMA_STATUS_GOOD;
-}
-
-
-
-/*
- * Destroy a scatter/gather list handle that was created by alloc_dma_handle().
- * The list must be empty (contain no elements).
- */
-void free_dma_handle(sgl_handle_t handle)
-{
- sgl_list_info_t *psgl = (sgl_list_info_t *)handle;
-
- if (!handle) {
-#ifdef DEBUG_405DMA
- printk("free_dma_handle: got NULL\n");
-#endif
- return;
- }
- else if (psgl->phead) {
-#ifdef DEBUG_405DMA
- printk("free_dma_handle: list not empty\n");
-#endif
- return;
- }
- else if (!psgl->dma_addr) { /* should never happen */
-#ifdef DEBUG_405DMA
- printk("free_dma_handle: no dma address\n");
-#endif
- return;
- }
-
- /* wrong not a PCI device -armin */
- /* pci_free_consistent(NULL, SGL_LIST_SIZE, (void *)psgl, psgl->dma_addr); */
- // free_pages((unsigned long)psgl, get_order(SGL_LIST_SIZE));
- consistent_free((void *)psgl);
-
-
+ return (GET_DMA_PW(control));
}
-EXPORT_SYMBOL(hw_init_dma_channel);
-EXPORT_SYMBOL(get_channel_config);
-EXPORT_SYMBOL(set_channel_priority);
-EXPORT_SYMBOL(get_peripheral_width);
-EXPORT_SYMBOL(alloc_dma_handle);
-EXPORT_SYMBOL(free_dma_handle);
+EXPORT_SYMBOL(ppc4xx_init_dma_channel);
+EXPORT_SYMBOL(ppc4xx_get_channel_config);
+EXPORT_SYMBOL(ppc4xx_set_channel_priority);
+EXPORT_SYMBOL(ppc4xx_get_peripheral_width);
EXPORT_SYMBOL(dma_channels);
+EXPORT_SYMBOL(ppc4xx_set_src_addr);
+EXPORT_SYMBOL(ppc4xx_set_dst_addr);
+EXPORT_SYMBOL(ppc4xx_set_dma_addr);
+EXPORT_SYMBOL(ppc4xx_set_dma_addr2);
+EXPORT_SYMBOL(ppc4xx_enable_dma);
+EXPORT_SYMBOL(ppc4xx_disable_dma);
+EXPORT_SYMBOL(ppc4xx_set_dma_mode);
+EXPORT_SYMBOL(ppc4xx_set_dma_count);
+EXPORT_SYMBOL(ppc4xx_get_dma_residue);
+EXPORT_SYMBOL(ppc4xx_enable_dma_interrupt);
+EXPORT_SYMBOL(ppc4xx_disable_dma_interrupt);
+EXPORT_SYMBOL(ppc4xx_get_dma_status);
diff -Nru a/arch/ppc/syslib/ppc4xx_sgdma.c b/arch/ppc/syslib/ppc4xx_sgdma.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/arch/ppc/syslib/ppc4xx_sgdma.c Fri Aug 6 16:24:56 2004
@@ -0,0 +1,455 @@
+/*
+ * arch/ppc/kernel/ppc4xx_sgdma.c
+ *
+ * IBM PPC4xx DMA engine scatter/gather library
+ *
+ * Copyright 2002-2003 MontaVista Software Inc.
+ *
+ * Cleaned up and converted to new DCR access
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Original code by Armin Kuster <akuster@mvista.com>
+ * and Pete Popov <ppopov@mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/ppc4xx_dma.h>
+
+void
+ppc4xx_set_sg_addr(int dmanr, phys_addr_t sg_addr)
+{
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_set_sg_addr: bad channel: %d\n", dmanr);
+ return;
+ }
+
+#ifdef PPC4xx_DMA_64BIT
+ mtdcr(DCRN_ASGH0 + (dmanr * 0x8), (u32)(sg_addr >> 32));
+#endif
+ mtdcr(DCRN_ASG0 + (dmanr * 0x8), (u32)sg_addr);
+}
+
+/*
+ * Add a new sgl descriptor to the end of a scatter/gather list
+ * which was created by alloc_dma_handle().
+ *
+ * For a memory to memory transfer, both dma addresses must be
+ * valid. For a peripheral to memory transfer, one of the addresses
+ * must be set to NULL, depending on the direction of the transfer:
+ * memory to peripheral: set dst_addr to NULL,
+ * peripheral to memory: set src_addr to NULL.
+ */
+int
+ppc4xx_add_dma_sgl(sgl_handle_t handle, phys_addr_t src_addr, phys_addr_t dst_addr,
+ unsigned int count)
+{
+ sgl_list_info_t *psgl = (sgl_list_info_t *) handle;
+ ppc_dma_ch_t *p_dma_ch;
+
+ if (!handle) {
+ printk("ppc4xx_add_dma_sgl: null handle\n");
+ return DMA_STATUS_BAD_HANDLE;
+ }
+
+ if (psgl->dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_add_dma_sgl: bad channel: %d\n", psgl->dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+
+ p_dma_ch = &dma_channels[psgl->dmanr];
+
+#ifdef DEBUG_4xxDMA
+ {
+ int error = 0;
+ unsigned int aligned =
+ (unsigned) src_addr | (unsigned) dst_addr | count;
+ switch (p_dma_ch->pwidth) {
+ case PW_8:
+ break;
+ case PW_16:
+ if (aligned & 0x1)
+ error = 1;
+ break;
+ case PW_32:
+ if (aligned & 0x3)
+ error = 1;
+ break;
+ case PW_64:
+ if (aligned & 0x7)
+ error = 1;
+ break;
+ default:
+ printk("ppc4xx_add_dma_sgl: invalid bus width: 0x%x\n",
+ p_dma_ch->pwidth);
+ return DMA_STATUS_GENERAL_ERROR;
+ }
+ if (error)
+ printk
+ ("Alignment warning: ppc4xx_add_dma_sgl src 0x%x dst 0x%x count 0x%x bus width var %d\n",
+ src_addr, dst_addr, count, p_dma_ch->pwidth);
+
+ }
+#endif
+
+ if ((unsigned) (psgl->ptail + 1) >= ((unsigned) psgl + SGL_LIST_SIZE)) {
+ printk("sgl handle out of memory \n");
+ return DMA_STATUS_OUT_OF_MEMORY;
+ }
+
+ if (!psgl->ptail) {
+ psgl->phead = (ppc_sgl_t *)
+ ((unsigned) psgl + sizeof (sgl_list_info_t));
+ psgl->phead_dma = psgl->dma_addr + sizeof(sgl_list_info_t);
+ psgl->ptail = psgl->phead;
+ psgl->ptail_dma = psgl->phead_dma;
+ } else {
+ psgl->ptail->next = psgl->ptail_dma + sizeof(ppc_sgl_t);
+ psgl->ptail++;
+ psgl->ptail_dma += sizeof(ppc_sgl_t);
+ }
+
+ psgl->ptail->control = psgl->control;
+ psgl->ptail->src_addr = src_addr;
+ psgl->ptail->dst_addr = dst_addr;
+ psgl->ptail->control_count = (count >> p_dma_ch->shift) |
+ psgl->sgl_control;
+ psgl->ptail->next = (uint32_t) NULL;
+
+ return DMA_STATUS_GOOD;
+}
+
+/*
+ * Enable (start) the DMA described by the sgl handle.
+ */
+void
+ppc4xx_enable_dma_sgl(sgl_handle_t handle)
+{
+ sgl_list_info_t *psgl = (sgl_list_info_t *) handle;
+ ppc_dma_ch_t *p_dma_ch;
+ uint32_t sg_command;
+
+ if (!handle) {
+ printk("ppc4xx_enable_dma_sgl: null handle\n");
+ return;
+ } else if (psgl->dmanr > (MAX_PPC4xx_DMA_CHANNELS - 1)) {
+ printk("ppc4xx_enable_dma_sgl: bad channel in handle %d\n",
+ psgl->dmanr);
+ return;
+ } else if (!psgl->phead) {
+ printk("ppc4xx_enable_dma_sgl: sg list empty\n");
+ return;
+ }
+
+ p_dma_ch = &dma_channels[psgl->dmanr];
+ psgl->ptail->control_count &= ~SG_LINK; /* make this the last dscrptr */
+ sg_command = mfdcr(DCRN_ASGC);
+
+ ppc4xx_set_sg_addr(psgl->dmanr, psgl->phead_dma);
+
+ sg_command |= SSG_ENABLE(psgl->dmanr);
+
+ mtdcr(DCRN_ASGC, sg_command); /* start transfer */
+}
+
+/*
+ * Halt an active scatter/gather DMA operation.
+ */
+void
+ppc4xx_disable_dma_sgl(sgl_handle_t handle)
+{
+ sgl_list_info_t *psgl = (sgl_list_info_t *) handle;
+ uint32_t sg_command;
+
+ if (!handle) {
+ printk("ppc4xx_enable_dma_sgl: null handle\n");
+ return;
+ } else if (psgl->dmanr > (MAX_PPC4xx_DMA_CHANNELS - 1)) {
+ printk("ppc4xx_enable_dma_sgl: bad channel in handle %d\n",
+ psgl->dmanr);
+ return;
+ }
+
+ sg_command = mfdcr(DCRN_ASGC);
+ sg_command &= ~SSG_ENABLE(psgl->dmanr);
+ mtdcr(DCRN_ASGC, sg_command); /* stop transfer */
+}
+
+/*
+ * Returns number of bytes left to be transferred from the entire sgl list.
+ * *src_addr and *dst_addr get set to the source/destination address of
+ * the sgl descriptor where the DMA stopped.
+ *
+ * An sgl transfer must NOT be active when this function is called.
+ */
+int
+ppc4xx_get_dma_sgl_residue(sgl_handle_t handle, phys_addr_t * src_addr,
+ phys_addr_t * dst_addr)
+{
+ sgl_list_info_t *psgl = (sgl_list_info_t *) handle;
+ ppc_dma_ch_t *p_dma_ch;
+ ppc_sgl_t *pnext, *sgl_addr;
+ uint32_t count_left;
+
+ if (!handle) {
+ printk("ppc4xx_get_dma_sgl_residue: null handle\n");
+ return DMA_STATUS_BAD_HANDLE;
+ } else if (psgl->dmanr > (MAX_PPC4xx_DMA_CHANNELS - 1)) {
+ printk("ppc4xx_get_dma_sgl_residue: bad channel in handle %d\n",
+ psgl->dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+
+ sgl_addr = (ppc_sgl_t *) __va(mfdcr(DCRN_ASG0 + (psgl->dmanr * 0x8)));
+ count_left = mfdcr(DCRN_DMACT0 + (psgl->dmanr * 0x8));
+
+ if (!sgl_addr) {
+ printk("ppc4xx_get_dma_sgl_residue: sgl addr register is null\n");
+ goto error;
+ }
+
+ pnext = psgl->phead;
+ while (pnext &&
+ ((unsigned) pnext < ((unsigned) psgl + SGL_LIST_SIZE) &&
+ (pnext != sgl_addr))
+ ) {
+ pnext++;
+ }
+
+ if (pnext == sgl_addr) { /* found the sgl descriptor */
+
+ *src_addr = pnext->src_addr;
+ *dst_addr = pnext->dst_addr;
+
+ /*
+ * Now search the remaining descriptors and add their count.
+ * We already have the remaining count from this descriptor in
+ * count_left.
+ */
+ pnext++;
+
+ while ((pnext != psgl->ptail) &&
+ ((unsigned) pnext < ((unsigned) psgl + SGL_LIST_SIZE))
+ ) {
+ count_left += pnext->control_count & SG_COUNT_MASK;
+ }
+
+ if (pnext != psgl->ptail) { /* should never happen */
+ printk
+ ("ppc4xx_get_dma_sgl_residue error (1) psgl->ptail 0x%x handle 0x%x\n",
+ (unsigned int) psgl->ptail, (unsigned int) handle);
+ goto error;
+ }
+
+ /* success */
+ p_dma_ch = &dma_channels[psgl->dmanr];
+ return (count_left << p_dma_ch->shift); /* count in bytes */
+
+ } else {
+ /* this shouldn't happen */
+ printk
+ ("get_dma_sgl_residue, unable to match current address 0x%x, handle 0x%x\n",
+ (unsigned int) sgl_addr, (unsigned int) handle);
+
+ }
+
+ error:
+ *src_addr = (phys_addr_t) NULL;
+ *dst_addr = (phys_addr_t) NULL;
+ return 0;
+}
+
+/*
+ * Returns the address(es) of the buffer(s) contained in the head element of
+ * the scatter/gather list. The element is removed from the scatter/gather
+ * list and the next element becomes the head.
+ *
+ * This function should only be called when the DMA is not active.
+ */
+int
+ppc4xx_delete_dma_sgl_element(sgl_handle_t handle, phys_addr_t * src_dma_addr,
+ phys_addr_t * dst_dma_addr)
+{
+ sgl_list_info_t *psgl = (sgl_list_info_t *) handle;
+
+ if (!handle) {
+ printk("ppc4xx_delete_sgl_element: null handle\n");
+ return DMA_STATUS_BAD_HANDLE;
+ } else if (psgl->dmanr > (MAX_PPC4xx_DMA_CHANNELS - 1)) {
+ printk("ppc4xx_delete_sgl_element: bad channel in handle %d\n",
+ psgl->dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+
+ if (!psgl->phead) {
+ printk("ppc4xx_delete_sgl_element: sgl list empty\n");
+ *src_dma_addr = (phys_addr_t) NULL;
+ *dst_dma_addr = (phys_addr_t) NULL;
+ return DMA_STATUS_SGL_LIST_EMPTY;
+ }
+
+ *src_dma_addr = (phys_addr_t) psgl->phead->src_addr;
+ *dst_dma_addr = (phys_addr_t) psgl->phead->dst_addr;
+
+ if (psgl->phead == psgl->ptail) {
+ /* last descriptor on the list */
+ psgl->phead = NULL;
+ psgl->ptail = NULL;
+ } else {
+ psgl->phead++;
+ psgl->phead_dma += sizeof(ppc_sgl_t);
+ }
+
+ return DMA_STATUS_GOOD;
+}
+
+
+/*
+ * Create a scatter/gather list handle. This is simply a structure which
+ * describes a scatter/gather list.
+ *
+ * A handle is returned in "handle" which the driver should save in order to
+ * be able to access this list later. A chunk of memory will be allocated
+ * to be used by the API for internal management purposes, including managing
+ * the sg list and allocating memory for the sgl descriptors. One page should
+ * be more than enough for that purpose. Perhaps it's a bit wasteful to use
+ * a whole page for a single sg list, but most likely there will be only one
+ * sg list per channel.
+ *
+ * Interrupt notes:
+ * Each sgl descriptor has a copy of the DMA control word which the DMA engine
+ * loads in the control register. The control word has a "global" interrupt
+ * enable bit for that channel. Interrupts are further qualified by a few bits
+ * in the sgl descriptor count register. In order to setup an sgl, we have to
+ * know ahead of time whether or not interrupts will be enabled at the completion
+ * of the transfers. Thus, enable_dma_interrupt()/disable_dma_interrupt() MUST
+ * be called before calling alloc_dma_handle(). If the interrupt mode will never
+ * change after powerup, then enable_dma_interrupt()/disable_dma_interrupt()
+ * do not have to be called -- interrupts will be enabled or disabled based
+ * on how the channel was configured after powerup by the hw_init_dma_channel()
+ * function. Each sgl descriptor will be setup to interrupt if an error occurs;
+ * however, only the last descriptor will be setup to interrupt. Thus, an
+ * interrupt will occur (if interrupts are enabled) only after the complete
+ * sgl transfer is done.
+ */
+int
+ppc4xx_alloc_dma_handle(sgl_handle_t * phandle, unsigned int mode, unsigned int dmanr)
+{
+ sgl_list_info_t *psgl;
+ dma_addr_t dma_addr;
+ ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
+ uint32_t sg_command;
+ void *ret;
+
+ if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
+ printk("ppc4xx_alloc_dma_handle: invalid channel 0x%x\n", dmanr);
+ return DMA_STATUS_BAD_CHANNEL;
+ }
+
+ if (!phandle) {
+ printk("ppc4xx_alloc_dma_handle: null handle pointer\n");
+ return DMA_STATUS_NULL_POINTER;
+ }
+
+ /* Get a page of memory, which is zeroed out by consistent_alloc() */
+ ret = dma_alloc_coherent(NULL, DMA_PPC4xx_SIZE, &dma_addr, GFP_KERNEL);
+ if (ret != NULL) {
+ memset(ret, 0, DMA_PPC4xx_SIZE);
+ psgl = (sgl_list_info_t *) ret;
+ }
+
+ if (psgl == NULL) {
+ *phandle = (sgl_handle_t) NULL;
+ return DMA_STATUS_OUT_OF_MEMORY;
+ }
+
+ psgl->dma_addr = dma_addr;
+ psgl->dmanr = dmanr;
+
+ /*
+ * Modify and save the control word. These words will be
+ * written to each sgl descriptor. The DMA engine then
+ * loads this control word into the control register
+ * every time it reads a new descriptor.
+ */
+ psgl->control = p_dma_ch->control;
+ /* Clear all mode bits */
+ psgl->control &= ~(DMA_TM_MASK | DMA_TD);
+ /* Save control word and mode */
+ psgl->control |= (mode | DMA_CE_ENABLE);
+
+ /* In MM mode, we must set ETD/TCE */
+ if (mode == DMA_MODE_MM)
+ psgl->control |= DMA_ETD_OUTPUT | DMA_TCE_ENABLE;
+
+ if (p_dma_ch->int_enable) {
+ /* Enable channel interrupt */
+ psgl->control |= DMA_CIE_ENABLE;
+ } else {
+ psgl->control &= ~DMA_CIE_ENABLE;
+ }
+
+ sg_command = mfdcr(DCRN_ASGC);
+ sg_command |= SSG_MASK_ENABLE(dmanr);
+
+ /* Enable SGL control access */
+ mtdcr(DCRN_ASGC, sg_command);
+ psgl->sgl_control = SG_ERI_ENABLE | SG_LINK;
+
+ if (p_dma_ch->int_enable) {
+ if (p_dma_ch->tce_enable)
+ psgl->sgl_control |= SG_TCI_ENABLE;
+ else
+ psgl->sgl_control |= SG_ETI_ENABLE;
+ }
+
+ *phandle = (sgl_handle_t) psgl;
+ return DMA_STATUS_GOOD;
+}
+
+/*
+ * Destroy a scatter/gather list handle that was created by alloc_dma_handle().
+ * The list must be empty (contain no elements).
+ */
+void
+ppc4xx_free_dma_handle(sgl_handle_t handle)
+{
+ sgl_list_info_t *psgl = (sgl_list_info_t *) handle;
+
+ if (!handle) {
+ printk("ppc4xx_free_dma_handle: got NULL\n");
+ return;
+ } else if (psgl->phead) {
+ printk("ppc4xx_free_dma_handle: list not empty\n");
+ return;
+ } else if (!psgl->dma_addr) { /* should never happen */
+ printk("ppc4xx_free_dma_handle: no dma address\n");
+ return;
+ }
+
+ dma_free_coherent(NULL, DMA_PPC4xx_SIZE, (void *) psgl, 0);
+}
+
+EXPORT_SYMBOL(ppc4xx_alloc_dma_handle);
+EXPORT_SYMBOL(ppc4xx_free_dma_handle);
+EXPORT_SYMBOL(ppc4xx_add_dma_sgl);
+EXPORT_SYMBOL(ppc4xx_delete_dma_sgl_element);
+EXPORT_SYMBOL(ppc4xx_enable_dma_sgl);
+EXPORT_SYMBOL(ppc4xx_disable_dma_sgl);
+EXPORT_SYMBOL(ppc4xx_get_dma_sgl_residue);
diff -Nru a/include/asm-ppc/ppc405_dma.h b/include/asm-ppc/ppc405_dma.h
--- a/include/asm-ppc/ppc405_dma.h Fri Aug 6 16:24:56 2004
+++ /dev/null Wed Dec 31 16:00:00 1969
@@ -1,1271 +0,0 @@
-/*
- * Author: Pete Popov <ppopov@mvista.com>
- *
- * 2000 (c) MontaVista, Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
- *
- * Data structures specific to the IBM PowerPC 405 on-chip DMA controller
- * and API.
- */
-
-#ifdef __KERNEL__
-#ifndef __ASMPPC_405_DMA_H
-#define __ASMPPC_405_DMA_H
-
-#include <linux/types.h>
-
-/* #define DEBUG_405DMA */
-
-#define TRUE 1
-#define FALSE 0
-
-#define SGL_LIST_SIZE 4096
-/* #define PCI_ALLOC_IS_NONCONSISTENT */
-
-#define MAX_405GP_DMA_CHANNELS 4
-
-/* The maximum address that we can perform a DMA transfer to on this platform */
-/* Doesn't really apply... */
-#define MAX_DMA_ADDRESS 0xFFFFFFFF
-
-extern unsigned long ISA_DMA_THRESHOLD;
-
-#define dma_outb outb
-#define dma_inb inb
-
-
-/*
- * Function return status codes
- * These values are used to indicate whether or not the function
- * call was successful, or a bad/invalid parameter was passed.
- */
-#define DMA_STATUS_GOOD 0
-#define DMA_STATUS_BAD_CHANNEL 1
-#define DMA_STATUS_BAD_HANDLE 2
-#define DMA_STATUS_BAD_MODE 3
-#define DMA_STATUS_NULL_POINTER 4
-#define DMA_STATUS_OUT_OF_MEMORY 5
-#define DMA_STATUS_SGL_LIST_EMPTY 6
-#define DMA_STATUS_GENERAL_ERROR 7
-
-
-/*
- * These indicate status as returned from the DMA Status Register.
- */
-#define DMA_STATUS_NO_ERROR 0
-#define DMA_STATUS_CS 1 /* Count Status */
-#define DMA_STATUS_TS 2 /* Transfer Status */
-#define DMA_STATUS_DMA_ERROR 3 /* DMA Error Occurred */
-#define DMA_STATUS_DMA_BUSY 4 /* The channel is busy */
-
-
-/*
- * Transfer Modes
- * These modes are defined in a way that makes it possible to
- * simply "or" in the value in the control register.
- */
-#define DMA_MODE_READ DMA_TD /* Peripheral to Memory */
-#define DMA_MODE_WRITE 0 /* Memory to Peripheral */
-#define DMA_MODE_MM (SET_DMA_TM(TM_S_MM)) /* memory to memory */
-
- /* Device-paced memory to memory, */
- /* device is at source address */
-#define DMA_MODE_MM_DEVATSRC (DMA_TD | SET_DMA_TM(TM_D_MM))
-
- /* Device-paced memory to memory, */
- /* device is at destination address */
-#define DMA_MODE_MM_DEVATDST (SET_DMA_TM(TM_D_MM))
-
-
-/*
- * DMA Polarity Configuration Register
- */
-#define DMAReq0_ActiveLow (1<<31)
-#define DMAAck0_ActiveLow (1<<30)
-#define EOT0_ActiveLow (1<<29) /* End of Transfer */
-
-#define DMAReq1_ActiveLow (1<<28)
-#define DMAAck1_ActiveLow (1<<27)
-#define EOT1_ActiveLow (1<<26)
-
-#define DMAReq2_ActiveLow (1<<25)
-#define DMAAck2_ActiveLow (1<<24)
-#define EOT2_ActiveLow (1<<23)
-
-#define DMAReq3_ActiveLow (1<<22)
-#define DMAAck3_ActiveLow (1<<21)
-#define EOT3_ActiveLow (1<<20)
-
-/*
- * DMA Sleep Mode Register
- */
-#define SLEEP_MODE_ENABLE (1<<21)
-
-
-/*
- * DMA Status Register
- */
-#define DMA_CS0 (1<<31) /* Terminal Count has been reached */
-#define DMA_CS1 (1<<30)
-#define DMA_CS2 (1<<29)
-#define DMA_CS3 (1<<28)
-
-#define DMA_TS0 (1<<27) /* End of Transfer has been requested */
-#define DMA_TS1 (1<<26)
-#define DMA_TS2 (1<<25)
-#define DMA_TS3 (1<<24)
-
-#define DMA_CH0_ERR (1<<23) /* DMA Chanel 0 Error */
-#define DMA_CH1_ERR (1<<22)
-#define DMA_CH2_ERR (1<<21)
-#define DMA_CH3_ERR (1<<20)
-
-#define DMA_IN_DMA_REQ0 (1<<19) /* Internal DMA Request is pending */
-#define DMA_IN_DMA_REQ1 (1<<18)
-#define DMA_IN_DMA_REQ2 (1<<17)
-#define DMA_IN_DMA_REQ3 (1<<16)
-
-#define DMA_EXT_DMA_REQ0 (1<<15) /* External DMA Request is pending */
-#define DMA_EXT_DMA_REQ1 (1<<14)
-#define DMA_EXT_DMA_REQ2 (1<<13)
-#define DMA_EXT_DMA_REQ3 (1<<12)
-
-#define DMA_CH0_BUSY (1<<11) /* DMA Channel 0 Busy */
-#define DMA_CH1_BUSY (1<<10)
-#define DMA_CH2_BUSY (1<<9)
-#define DMA_CH3_BUSY (1<<8)
-
-#define DMA_SG0 (1<<7) /* DMA Channel 0 Scatter/Gather in progress */
-#define DMA_SG1 (1<<6)
-#define DMA_SG2 (1<<5)
-#define DMA_SG3 (1<<4)
-
-
-
-/*
- * DMA Channel Control Registers
- */
-#define DMA_CH_ENABLE (1<<31) /* DMA Channel Enable */
-#define SET_DMA_CH_ENABLE(x) (((x)&0x1)<<31)
-#define GET_DMA_CH_ENABLE(x) (((x)&DMA_CH_ENABLE)>>31)
-
-#define DMA_CIE_ENABLE (1<<30) /* DMA Channel Interrupt Enable */
-#define SET_DMA_CIE_ENABLE(x) (((x)&0x1)<<30)
-#define GET_DMA_CIE_ENABLE(x) (((x)&DMA_CIE_ENABLE)>>30)
-
-#define DMA_TD (1<<29)
-#define SET_DMA_TD(x) (((x)&0x1)<<29)
-#define GET_DMA_TD(x) (((x)&DMA_TD)>>29)
-
-#define DMA_PL (1<<28) /* Peripheral Location */
-#define SET_DMA_PL(x) (((x)&0x1)<<28)
-#define GET_DMA_PL(x) (((x)&DMA_PL)>>28)
-
-#define EXTERNAL_PERIPHERAL 0
-#define INTERNAL_PERIPHERAL 1
-
-
-#define SET_DMA_PW(x) (((x)&0x3)<<26) /* Peripheral Width */
-#define DMA_PW_MASK SET_DMA_PW(3)
-#define PW_8 0
-#define PW_16 1
-#define PW_32 2
-#define PW_64 3
-#define GET_DMA_PW(x) (((x)&DMA_PW_MASK)>>26)
-
-#define DMA_DAI (1<<25) /* Destination Address Increment */
-#define SET_DMA_DAI(x) (((x)&0x1)<<25)
-
-#define DMA_SAI (1<<24) /* Source Address Increment */
-#define SET_DMA_SAI(x) (((x)&0x1)<<24)
-
-#define DMA_BEN (1<<23) /* Buffer Enable */
-#define SET_DMA_BEN(x) (((x)&0x1)<<23)
-
-#define SET_DMA_TM(x) (((x)&0x3)<<21) /* Transfer Mode */
-#define DMA_TM_MASK SET_DMA_TM(3)
-#define TM_PERIPHERAL 0 /* Peripheral */
-#define TM_RESERVED 1 /* Reserved */
-#define TM_S_MM 2 /* Memory to Memory */
-#define TM_D_MM 3 /* Device Paced Memory to Memory */
-#define GET_DMA_TM(x) (((x)&DMA_TM_MASK)>>21)
-
-#define SET_DMA_PSC(x) (((x)&0x3)<<19) /* Peripheral Setup Cycles */
-#define DMA_PSC_MASK SET_DMA_PSC(3)
-#define GET_DMA_PSC(x) (((x)&DMA_PSC_MASK)>>19)
-
-#define SET_DMA_PWC(x) (((x)&0x3F)<<13) /* Peripheral Wait Cycles */
-#define DMA_PWC_MASK SET_DMA_PWC(0x3F)
-#define GET_DMA_PWC(x) (((x)&DMA_PWC_MASK)>>13)
-
-#define SET_DMA_PHC(x) (((x)&0x7)<<10) /* Peripheral Hold Cycles */
-#define DMA_PHC_MASK SET_DMA_PHC(0x7)
-#define GET_DMA_PHC(x) (((x)&DMA_PHC_MASK)>>10)
-
-#define DMA_ETD_OUTPUT (1<<9) /* EOT pin is a TC output */
-#define SET_DMA_ETD(x) (((x)&0x1)<<9)
-
-#define DMA_TCE_ENABLE (1<<8)
-#define SET_DMA_TCE(x) (((x)&0x1)<<8)
-
-#define SET_DMA_PRIORITY(x) (((x)&0x3)<<6) /* DMA Channel Priority */
-#define DMA_PRIORITY_MASK SET_DMA_PRIORITY(3)
-#define PRIORITY_LOW 0
-#define PRIORITY_MID_LOW 1
-#define PRIORITY_MID_HIGH 2
-#define PRIORITY_HIGH 3
-#define GET_DMA_PRIORITY(x) (((x)&DMA_PRIORITY_MASK)>>6)
-
-#define SET_DMA_PREFETCH(x) (((x)&0x3)<<4) /* Memory Read Prefetch */
-#define DMA_PREFETCH_MASK SET_DMA_PREFETCH(3)
-#define PREFETCH_1 0 /* Prefetch 1 Double Word */
-#define PREFETCH_2 1
-#define PREFETCH_4 2
-#define GET_DMA_PREFETCH(x) (((x)&DMA_PREFETCH_MASK)>>4)
-
-#define DMA_PCE (1<<3) /* Parity Check Enable */
-#define SET_DMA_PCE(x) (((x)&0x1)<<3)
-#define GET_DMA_PCE(x) (((x)&DMA_PCE)>>3)
-
-#define DMA_DEC (1<<2) /* Address Decrement */
-#define SET_DMA_DEC(x) (((x)&0x1)<<2)
-#define GET_DMA_DEC(x) (((x)&DMA_DEC)>>2)
-
-/*
- * DMA SG Command Register
- */
-#define SSG0_ENABLE (1<<31) /* Start Scatter Gather */
-#define SSG1_ENABLE (1<<30)
-#define SSG2_ENABLE (1<<29)
-#define SSG3_ENABLE (1<<28)
-#define SSG0_MASK_ENABLE (1<<15) /* Enable writing to SSG0 bit */
-#define SSG1_MASK_ENABLE (1<<14)
-#define SSG2_MASK_ENABLE (1<<13)
-#define SSG3_MASK_ENABLE (1<<12)
-
-
-/*
- * DMA Scatter/Gather Descriptor Bit fields
- */
-#define SG_LINK (1<<31) /* Link */
-#define SG_TCI_ENABLE (1<<29) /* Enable Terminal Count Interrupt */
-#define SG_ETI_ENABLE (1<<28) /* Enable End of Transfer Interrupt */
-#define SG_ERI_ENABLE (1<<27) /* Enable Error Interrupt */
-#define SG_COUNT_MASK 0xFFFF /* Count Field */
-
-
-
-
-typedef uint32_t sgl_handle_t;
-
-typedef struct {
-
- /*
- * Valid polarity settings:
- * DMAReq0_ActiveLow
- * DMAAck0_ActiveLow
- * EOT0_ActiveLow
- *
- * DMAReq1_ActiveLow
- * DMAAck1_ActiveLow
- * EOT1_ActiveLow
- *
- * DMAReq2_ActiveLow
- * DMAAck2_ActiveLow
- * EOT2_ActiveLow
- *
- * DMAReq3_ActiveLow
- * DMAAck3_ActiveLow
- * EOT3_ActiveLow
- */
- unsigned int polarity;
-
- char buffer_enable; /* Boolean: buffer enable */
- char tce_enable; /* Boolean: terminal count enable */
- char etd_output; /* Boolean: eot pin is a tc output */
- char pce; /* Boolean: parity check enable */
-
- /*
- * Peripheral location:
- * INTERNAL_PERIPHERAL (UART0 on the 405GP)
- * EXTERNAL_PERIPHERAL
- */
- char pl; /* internal/external peripheral */
-
- /*
- * Valid pwidth settings:
- * PW_8
- * PW_16
- * PW_32
- * PW_64
- */
- unsigned int pwidth;
-
- char dai; /* Boolean: dst address increment */
- char sai; /* Boolean: src address increment */
-
- /*
- * Valid psc settings: 0-3
- */
- unsigned int psc; /* Peripheral Setup Cycles */
-
- /*
- * Valid pwc settings:
- * 0-63
- */
- unsigned int pwc; /* Peripheral Wait Cycles */
-
- /*
- * Valid phc settings:
- * 0-7
- */
- unsigned int phc; /* Peripheral Hold Cycles */
-
- /*
- * Valid cp (channel priority) settings:
- * PRIORITY_LOW
- * PRIORITY_MID_LOW
- * PRIORITY_MID_HIGH
- * PRIORITY_HIGH
- */
- unsigned int cp; /* channel priority */
-
- /*
- * Valid pf (memory read prefetch) settings:
- *
- * PREFETCH_1
- * PREFETCH_2
- * PREFETCH_4
- */
- unsigned int pf; /* memory read prefetch */
-
- /*
- * Boolean: channel interrupt enable
- * NOTE: for sgl transfers, only the last descriptor will be setup to
- * interrupt.
- */
- char int_enable;
-
- char shift; /* easy access to byte_count shift, based on */
- /* the width of the channel */
-
- uint32_t control; /* channel control word */
-
-
- /* These variabled are used ONLY in single dma transfers */
- unsigned int mode; /* transfer mode */
- dma_addr_t addr;
-
-} ppc_dma_ch_t;
-
-
-typedef struct {
- uint32_t control;
- uint32_t src_addr;
- uint32_t dst_addr;
- uint32_t control_count;
- uint32_t next;
-} ppc_sgl_t;
-
-
-
-typedef struct {
- unsigned int dmanr;
- uint32_t control; /* channel ctrl word; loaded from each descrptr */
- uint32_t sgl_control; /* LK, TCI, ETI, and ERI bits in sgl descriptor */
- dma_addr_t dma_addr; /* dma (physical) address of this list */
- ppc_sgl_t *phead;
- ppc_sgl_t *ptail;
-
-} sgl_list_info_t;
-
-
-typedef struct {
- unsigned int *src_addr;
- unsigned int *dst_addr;
- dma_addr_t dma_src_addr;
- dma_addr_t dma_dst_addr;
-} pci_alloc_desc_t;
-
-
-extern ppc_dma_ch_t dma_channels[];
-
-/*
- *
- * DMA API inline functions
- * These functions are implemented here as inline functions for
- * performance reasons.
- *
- */
-
-static __inline__ int get_405gp_dma_status(void)
-{
- return (mfdcr(DCRN_DMASR));
-}
-
-
-static __inline__ int enable_405gp_dma(unsigned int dmanr)
-{
- unsigned int control;
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-
-#ifdef DEBUG_405DMA
- if (dmanr >= MAX_405GP_DMA_CHANNELS) {
- printk("enable_dma: bad channel: %d\n", dmanr);
- return DMA_STATUS_BAD_CHANNEL;
- }
-#endif
-
-
- switch (dmanr) {
- case 0:
- if (p_dma_ch->mode == DMA_MODE_READ) {
- /* peripheral to memory */
- mtdcr(DCRN_DMASA0, NULL);
- mtdcr(DCRN_DMADA0, p_dma_ch->addr);
- }
- else if (p_dma_ch->mode == DMA_MODE_WRITE) {
- /* memory to peripheral */
- mtdcr(DCRN_DMASA0, p_dma_ch->addr);
- mtdcr(DCRN_DMADA0, NULL);
- }
- /* for other xfer modes, the addresses are already set */
- control = mfdcr(DCRN_DMACR0);
- control &= ~(DMA_TM_MASK | DMA_TD); /* clear all mode bits */
- control |= (p_dma_ch->mode | DMA_CH_ENABLE);
- mtdcr(DCRN_DMACR0, control);
- break;
- case 1:
- if (p_dma_ch->mode == DMA_MODE_READ) {
- mtdcr(DCRN_DMASA1, NULL);
- mtdcr(DCRN_DMADA1, p_dma_ch->addr);
- } else if (p_dma_ch->mode == DMA_MODE_WRITE) {
- mtdcr(DCRN_DMASA1, p_dma_ch->addr);
- mtdcr(DCRN_DMADA1, NULL);
- }
- control = mfdcr(DCRN_DMACR1);
- control &= ~(DMA_TM_MASK | DMA_TD);
- control |= (p_dma_ch->mode | DMA_CH_ENABLE);
- mtdcr(DCRN_DMACR1, control);
- break;
- case 2:
- if (p_dma_ch->mode == DMA_MODE_READ) {
- mtdcr(DCRN_DMASA2, NULL);
- mtdcr(DCRN_DMADA2, p_dma_ch->addr);
- } else if (p_dma_ch->mode == DMA_MODE_WRITE) {
- mtdcr(DCRN_DMASA2, p_dma_ch->addr);
- mtdcr(DCRN_DMADA2, NULL);
- }
- control = mfdcr(DCRN_DMACR2);
- control &= ~(DMA_TM_MASK | DMA_TD);
- control |= (p_dma_ch->mode | DMA_CH_ENABLE);
- mtdcr(DCRN_DMACR2, control);
- break;
- case 3:
- if (p_dma_ch->mode == DMA_MODE_READ) {
- mtdcr(DCRN_DMASA3, NULL);
- mtdcr(DCRN_DMADA3, p_dma_ch->addr);
- } else if (p_dma_ch->mode == DMA_MODE_WRITE) {
- mtdcr(DCRN_DMASA3, p_dma_ch->addr);
- mtdcr(DCRN_DMADA3, NULL);
- }
- control = mfdcr(DCRN_DMACR3);
- control &= ~(DMA_TM_MASK | DMA_TD);
- control |= (p_dma_ch->mode | DMA_CH_ENABLE);
- mtdcr(DCRN_DMACR3, control);
- break;
- default:
- return DMA_STATUS_BAD_CHANNEL;
- }
- return DMA_STATUS_GOOD;
-}
-
-
-
-static __inline__ void disable_405gp_dma(unsigned int dmanr)
-{
- unsigned int control;
-
- switch (dmanr) {
- case 0:
- control = mfdcr(DCRN_DMACR0);
- control &= ~DMA_CH_ENABLE;
- mtdcr(DCRN_DMACR0, control);
- break;
- case 1:
- control = mfdcr(DCRN_DMACR1);
- control &= ~DMA_CH_ENABLE;
- mtdcr(DCRN_DMACR1, control);
- break;
- case 2:
- control = mfdcr(DCRN_DMACR2);
- control &= ~DMA_CH_ENABLE;
- mtdcr(DCRN_DMACR2, control);
- break;
- case 3:
- control = mfdcr(DCRN_DMACR3);
- control &= ~DMA_CH_ENABLE;
- mtdcr(DCRN_DMACR3, control);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("disable_dma: bad channel: %d\n", dmanr);
-#endif
- }
-}
-
-
-
-/*
- * Sets the dma mode for single DMA transfers only.
- * For scatter/gather transfers, the mode is passed to the
- * alloc_dma_handle() function as one of the parameters.
- *
- * The mode is simply saved and used later. This allows
- * the driver to call set_dma_mode() and set_dma_addr() in
- * any order.
- *
- * Valid mode values are:
- *
- * DMA_MODE_READ peripheral to memory
- * DMA_MODE_WRITE memory to peripheral
- * DMA_MODE_MM memory to memory
- * DMA_MODE_MM_DEVATSRC device-paced memory to memory, device at src
- * DMA_MODE_MM_DEVATDST device-paced memory to memory, device at dst
- */
-static __inline__ int set_405gp_dma_mode(unsigned int dmanr, unsigned int mode)
-{
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-
-#ifdef DEBUG_405DMA
- switch (mode) {
- case DMA_MODE_READ:
- case DMA_MODE_WRITE:
- case DMA_MODE_MM:
- case DMA_MODE_MM_DEVATSRC:
- case DMA_MODE_MM_DEVATDST:
- break;
- default:
- printk("set_dma_mode: bad mode 0x%x\n", mode);
- return DMA_STATUS_BAD_MODE;
- }
- if (dmanr >= MAX_405GP_DMA_CHANNELS) {
- printk("set_dma_mode: bad channel 0x%x\n", dmanr);
- return DMA_STATUS_BAD_CHANNEL;
- }
-#endif
-
- p_dma_ch->mode = mode;
- return DMA_STATUS_GOOD;
-}
-
-
-
-/*
- * Sets the DMA Count register. Note that 'count' is in bytes.
- * However, the DMA Count register counts the number of "transfers",
- * where each transfer is equal to the bus width. Thus, count
- * MUST be a multiple of the bus width.
- */
-static __inline__ void
-set_405gp_dma_count(unsigned int dmanr, unsigned int count)
-{
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-
-#ifdef DEBUG_405DMA
- {
- int error = 0;
- switch(p_dma_ch->pwidth) {
- case PW_8:
- break;
- case PW_16:
- if (count & 0x1)
- error = 1;
- break;
- case PW_32:
- if (count & 0x3)
- error = 1;
- break;
- case PW_64:
- if (count & 0x7)
- error = 1;
- break;
- default:
- printk("set_dma_count: invalid bus width: 0x%x\n",
- p_dma_ch->pwidth);
- return;
- }
- if (error)
- printk("Warning: set_dma_count count 0x%x bus width %d\n",
- count, p_dma_ch->pwidth);
- }
-#endif
-
- count = count >> p_dma_ch->shift;
- switch (dmanr) {
- case 0:
- mtdcr(DCRN_DMACT0, count);
- break;
- case 1:
- mtdcr(DCRN_DMACT1, count);
- break;
- case 2:
- mtdcr(DCRN_DMACT2, count);
- break;
- case 3:
- mtdcr(DCRN_DMACT3, count);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("set_dma_count: bad channel: %d\n", dmanr);
-#endif
- }
-}
-
-
-
-/*
- * Returns the number of bytes left to be transfered.
- * After a DMA transfer, this should return zero.
- * Reading this while a DMA transfer is still in progress will return
- * unpredictable results.
- */
-static __inline__ int get_405gp_dma_residue(unsigned int dmanr)
-{
- unsigned int count;
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-
- switch (dmanr) {
- case 0:
- count = mfdcr(DCRN_DMACT0);
- break;
- case 1:
- count = mfdcr(DCRN_DMACT1);
- break;
- case 2:
- count = mfdcr(DCRN_DMACT2);
- break;
- case 3:
- count = mfdcr(DCRN_DMACT3);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("get_dma_residue: bad channel: %d\n", dmanr);
-#endif
- return 0;
- }
-
- return (count << p_dma_ch->shift);
-}
-
-
-
-/*
- * Sets the DMA address for a memory to peripheral or peripheral
- * to memory transfer. The address is just saved in the channel
- * structure for now and used later in enable_dma().
- */
-static __inline__ void set_405gp_dma_addr(unsigned int dmanr, dma_addr_t addr)
-{
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-#ifdef DEBUG_405DMA
- {
- int error = 0;
- switch(p_dma_ch->pwidth) {
- case PW_8:
- break;
- case PW_16:
- if ((unsigned)addr & 0x1)
- error = 1;
- break;
- case PW_32:
- if ((unsigned)addr & 0x3)
- error = 1;
- break;
- case PW_64:
- if ((unsigned)addr & 0x7)
- error = 1;
- break;
- default:
- printk("set_dma_addr: invalid bus width: 0x%x\n",
- p_dma_ch->pwidth);
- return;
- }
- if (error)
- printk("Warning: set_dma_addr addr 0x%x bus width %d\n",
- addr, p_dma_ch->pwidth);
- }
-#endif
-
- /* save dma address and program it later after we know the xfer mode */
- p_dma_ch->addr = addr;
-}
-
-
-
-
-/*
- * Sets both DMA addresses for a memory to memory transfer.
- * For memory to peripheral or peripheral to memory transfers
- * the function set_dma_addr() should be used instead.
- */
-static __inline__ void
-set_405gp_dma_addr2(unsigned int dmanr, dma_addr_t src_dma_addr,
- dma_addr_t dst_dma_addr)
-{
-#ifdef DEBUG_405DMA
- {
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
- int error = 0;
- switch(p_dma_ch->pwidth) {
- case PW_8:
- break;
- case PW_16:
- if (((unsigned)src_dma_addr & 0x1) ||
- ((unsigned)dst_dma_addr & 0x1)
- )
- error = 1;
- break;
- case PW_32:
- if (((unsigned)src_dma_addr & 0x3) ||
- ((unsigned)dst_dma_addr & 0x3)
- )
- error = 1;
- break;
- case PW_64:
- if (((unsigned)src_dma_addr & 0x7) ||
- ((unsigned)dst_dma_addr & 0x7)
- )
- error = 1;
- break;
- default:
- printk("set_dma_addr2: invalid bus width: 0x%x\n",
- p_dma_ch->pwidth);
- return;
- }
- if (error)
- printk("Warning: set_dma_addr2 src 0x%x dst 0x%x bus width %d\n",
- src_dma_addr, dst_dma_addr, p_dma_ch->pwidth);
- }
-#endif
-
- switch (dmanr) {
- case 0:
- mtdcr(DCRN_DMASA0, src_dma_addr);
- mtdcr(DCRN_DMADA0, dst_dma_addr);
- break;
- case 1:
- mtdcr(DCRN_DMASA1, src_dma_addr);
- mtdcr(DCRN_DMADA1, dst_dma_addr);
- break;
- case 2:
- mtdcr(DCRN_DMASA2, src_dma_addr);
- mtdcr(DCRN_DMADA2, dst_dma_addr);
- break;
- case 3:
- mtdcr(DCRN_DMASA3, src_dma_addr);
- mtdcr(DCRN_DMADA3, dst_dma_addr);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("set_dma_addr2: bad channel: %d\n", dmanr);
-#endif
- }
-}
-
-
-
-/*
- * Enables the channel interrupt.
- *
- * If performing a scatter/gatter transfer, this function
- * MUST be called before calling alloc_dma_handle() and building
- * the sgl list. Otherwise, interrupts will not be enabled, if
- * they were previously disabled.
- */
-static __inline__ int
-enable_405gp_dma_interrupt(unsigned int dmanr)
-{
- unsigned int control;
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-
- p_dma_ch->int_enable = TRUE;
- switch (dmanr) {
- case 0:
- control = mfdcr(DCRN_DMACR0);
- control|= DMA_CIE_ENABLE; /* Channel Interrupt Enable */
- mtdcr(DCRN_DMACR0, control);
- break;
- case 1:
- control = mfdcr(DCRN_DMACR1);
- control|= DMA_CIE_ENABLE;
- mtdcr(DCRN_DMACR1, control);
- break;
- case 2:
- control = mfdcr(DCRN_DMACR2);
- control|= DMA_CIE_ENABLE;
- mtdcr(DCRN_DMACR2, control);
- break;
- case 3:
- control = mfdcr(DCRN_DMACR3);
- control|= DMA_CIE_ENABLE;
- mtdcr(DCRN_DMACR3, control);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("enable_dma_interrupt: bad channel: %d\n", dmanr);
-#endif
- return DMA_STATUS_BAD_CHANNEL;
- }
- return DMA_STATUS_GOOD;
-}
-
-
-
-/*
- * Disables the channel interrupt.
- *
- * If performing a scatter/gatter transfer, this function
- * MUST be called before calling alloc_dma_handle() and building
- * the sgl list. Otherwise, interrupts will not be disabled, if
- * they were previously enabled.
- */
-static __inline__ int
-disable_405gp_dma_interrupt(unsigned int dmanr)
-{
- unsigned int control;
- ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
-
- p_dma_ch->int_enable = TRUE;
- switch (dmanr) {
- case 0:
- control = mfdcr(DCRN_DMACR0);
- control &= ~DMA_CIE_ENABLE; /* Channel Interrupt Enable */
- mtdcr(DCRN_DMACR0, control);
- break;
- case 1:
- control = mfdcr(DCRN_DMACR1);
- control &= ~DMA_CIE_ENABLE;
- mtdcr(DCRN_DMACR1, control);
- break;
- case 2:
- control = mfdcr(DCRN_DMACR2);
- control &= ~DMA_CIE_ENABLE;
- mtdcr(DCRN_DMACR2, control);
- break;
- case 3:
- control = mfdcr(DCRN_DMACR3);
- control &= ~DMA_CIE_ENABLE;
- mtdcr(DCRN_DMACR3, control);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("enable_dma_interrupt: bad channel: %d\n", dmanr);
-#endif
- return DMA_STATUS_BAD_CHANNEL;
- }
- return DMA_STATUS_GOOD;
-}
-
-
-#ifdef DCRNCAP_DMA_SG
-
-/*
- * Add a new sgl descriptor to the end of a scatter/gather list
- * which was created by alloc_dma_handle().
- *
- * For a memory to memory transfer, both dma addresses must be
- * valid. For a peripheral to memory transfer, one of the addresses
- * must be set to NULL, depending on the direction of the transfer:
- * memory to peripheral: set dst_addr to NULL,
- * peripheral to memory: set src_addr to NULL.
- */
-static __inline__ int
-add_405gp_dma_sgl(sgl_handle_t handle, dma_addr_t src_addr, dma_addr_t dst_addr,
- unsigned int count)
-{
- sgl_list_info_t *psgl = (sgl_list_info_t *)handle;
- ppc_dma_ch_t *p_dma_ch;
-
- if (!handle) {
-#ifdef DEBUG_405DMA
- printk("add_dma_sgl: null handle\n");
-#endif
- return DMA_STATUS_BAD_HANDLE;
- }
-
-#ifdef DEBUG_405DMA
- if (psgl->dmanr >= MAX_405GP_DMA_CHANNELS) {
- printk("add_dma_sgl error: psgl->dmanr == %d\n", psgl->dmanr);
- return DMA_STATUS_BAD_CHANNEL;
- }
-#endif
-
- p_dma_ch = &dma_channels[psgl->dmanr];
-
-#ifdef DEBUG_405DMA
- {
- int error = 0;
- unsigned int aligned = (unsigned)src_addr | (unsigned)dst_addr | count;
- switch(p_dma_ch->pwidth) {
- case PW_8:
- break;
- case PW_16:
- if (aligned & 0x1)
- error = 1;
- break;
- case PW_32:
- if (aligned & 0x3)
- error = 1;
- break;
- case PW_64:
- if (aligned & 0x7)
- error = 1;
- break;
- default:
- printk("add_dma_sgl: invalid bus width: 0x%x\n",
- p_dma_ch->pwidth);
- return DMA_STATUS_GENERAL_ERROR;
- }
- if (error)
- printk("Alignment warning: add_dma_sgl src 0x%x dst 0x%x count 0x%x bus width var %d\n",
- src_addr, dst_addr, count, p_dma_ch->pwidth);
-
- }
-#endif
-
- if ((unsigned)(psgl->ptail + 1) >= ((unsigned)psgl + SGL_LIST_SIZE)) {
-#ifdef DEBUG_405DMA
- printk("sgl handle out of memory \n");
-#endif
- return DMA_STATUS_OUT_OF_MEMORY;
- }
-
-
- if (!psgl->ptail) {
- psgl->phead = (ppc_sgl_t *)
- ((unsigned)psgl + sizeof(sgl_list_info_t));
- psgl->ptail = psgl->phead;
- } else {
- psgl->ptail->next = virt_to_bus(psgl->ptail + 1);
- psgl->ptail++;
- }
-
- psgl->ptail->control = psgl->control;
- psgl->ptail->src_addr = src_addr;
- psgl->ptail->dst_addr = dst_addr;
- psgl->ptail->control_count = (count >> p_dma_ch->shift) |
- psgl->sgl_control;
- psgl->ptail->next = (uint32_t)NULL;
-
- return DMA_STATUS_GOOD;
-}
-
-
-
-/*
- * Enable (start) the DMA described by the sgl handle.
- */
-static __inline__ void enable_405gp_dma_sgl(sgl_handle_t handle)
-{
- sgl_list_info_t *psgl = (sgl_list_info_t *)handle;
- ppc_dma_ch_t *p_dma_ch;
- uint32_t sg_command;
-
-#ifdef DEBUG_405DMA
- if (!handle) {
- printk("enable_dma_sgl: null handle\n");
- return;
- } else if (psgl->dmanr > (MAX_405GP_DMA_CHANNELS - 1)) {
- printk("enable_dma_sgl: bad channel in handle %d\n",
- psgl->dmanr);
- return;
- } else if (!psgl->phead) {
- printk("enable_dma_sgl: sg list empty\n");
- return;
- }
-#endif
-
- p_dma_ch = &dma_channels[psgl->dmanr];
- psgl->ptail->control_count &= ~SG_LINK; /* make this the last dscrptr */
- sg_command = mfdcr(DCRN_ASGC);
-
- switch(psgl->dmanr) {
- case 0:
- mtdcr(DCRN_ASG0, virt_to_bus(psgl->phead));
- sg_command |= SSG0_ENABLE;
- break;
- case 1:
- mtdcr(DCRN_ASG1, virt_to_bus(psgl->phead));
- sg_command |= SSG1_ENABLE;
- break;
- case 2:
- mtdcr(DCRN_ASG2, virt_to_bus(psgl->phead));
- sg_command |= SSG2_ENABLE;
- break;
- case 3:
- mtdcr(DCRN_ASG3, virt_to_bus(psgl->phead));
- sg_command |= SSG3_ENABLE;
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("enable_dma_sgl: bad channel: %d\n", psgl->dmanr);
-#endif
- }
-
-#if 0 /* debug */
- printk("\n\nenable_dma_sgl at dma_addr 0x%x\n",
- virt_to_bus(psgl->phead));
- {
- ppc_sgl_t *pnext, *sgl_addr;
-
- pnext = psgl->phead;
- while (pnext) {
- printk("dma descriptor at 0x%x, dma addr 0x%x\n",
- (unsigned)pnext, (unsigned)virt_to_bus(pnext));
- printk("control 0x%x src 0x%x dst 0x%x c_count 0x%x, next 0x%x\n",
- (unsigned)pnext->control, (unsigned)pnext->src_addr,
- (unsigned)pnext->dst_addr,
- (unsigned)pnext->control_count, (unsigned)pnext->next);
-
- (unsigned)pnext = bus_to_virt(pnext->next);
- }
- printk("sg_command 0x%x\n", sg_command);
- }
-#endif
-
-#ifdef PCI_ALLOC_IS_NONCONSISTENT
- /*
- * This is temporary only, until pci_alloc_consistent() really does
- * return "consistent" memory.
- */
- flush_dcache_range((unsigned)handle, (unsigned)handle + SGL_LIST_SIZE);
-#endif
-
- mtdcr(DCRN_ASGC, sg_command); /* start transfer */
-}
-
-
-
-/*
- * Halt an active scatter/gather DMA operation.
- */
-static __inline__ void disable_405gp_dma_sgl(sgl_handle_t handle)
-{
- sgl_list_info_t *psgl = (sgl_list_info_t *)handle;
- uint32_t sg_command;
-
-#ifdef DEBUG_405DMA
- if (!handle) {
- printk("enable_dma_sgl: null handle\n");
- return;
- } else if (psgl->dmanr > (MAX_405GP_DMA_CHANNELS - 1)) {
- printk("enable_dma_sgl: bad channel in handle %d\n",
- psgl->dmanr);
- return;
- }
-#endif
- sg_command = mfdcr(DCRN_ASGC);
- switch(psgl->dmanr) {
- case 0:
- sg_command &= ~SSG0_ENABLE;
- break;
- case 1:
- sg_command &= ~SSG1_ENABLE;
- break;
- case 2:
- sg_command &= ~SSG2_ENABLE;
- break;
- case 3:
- sg_command &= ~SSG3_ENABLE;
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("enable_dma_sgl: bad channel: %d\n", psgl->dmanr);
-#endif
- }
-
- mtdcr(DCRN_ASGC, sg_command); /* stop transfer */
-}
-
-
-
-/*
- * Returns number of bytes left to be transferred from the entire sgl list.
- * *src_addr and *dst_addr get set to the source/destination address of
- * the sgl descriptor where the DMA stopped.
- *
- * An sgl transfer must NOT be active when this function is called.
- */
-static __inline__ int
-get_405gp_dma_sgl_residue(sgl_handle_t handle, dma_addr_t *src_addr,
- dma_addr_t *dst_addr)
-{
- sgl_list_info_t *psgl = (sgl_list_info_t *)handle;
- ppc_dma_ch_t *p_dma_ch;
- ppc_sgl_t *pnext, *sgl_addr;
- uint32_t count_left;
-
-#ifdef DEBUG_405DMA
- if (!handle) {
- printk("get_dma_sgl_residue: null handle\n");
- return DMA_STATUS_BAD_HANDLE;
- } else if (psgl->dmanr > (MAX_405GP_DMA_CHANNELS - 1)) {
- printk("get_dma_sgl_residue: bad channel in handle %d\n",
- psgl->dmanr);
- return DMA_STATUS_BAD_CHANNEL;
- }
-#endif
-
- switch(psgl->dmanr) {
- case 0:
- sgl_addr = (ppc_sgl_t *)bus_to_virt(mfdcr(DCRN_ASG0));
- count_left = mfdcr(DCRN_DMACT0);
- break;
- case 1:
- sgl_addr = (ppc_sgl_t *)bus_to_virt(mfdcr(DCRN_ASG1));
- count_left = mfdcr(DCRN_DMACT1);
- break;
- case 2:
- sgl_addr = (ppc_sgl_t *)bus_to_virt(mfdcr(DCRN_ASG2));
- count_left = mfdcr(DCRN_DMACT2);
- break;
- case 3:
- sgl_addr = (ppc_sgl_t *)bus_to_virt(mfdcr(DCRN_ASG3));
- count_left = mfdcr(DCRN_DMACT3);
- break;
- default:
-#ifdef DEBUG_405DMA
- printk("get_dma_sgl_residue: bad channel: %d\n", psgl->dmanr);
-#endif
- goto error;
- }
-
- if (!sgl_addr) {
-#ifdef DEBUG_405DMA
- printk("get_dma_sgl_residue: sgl addr register is null\n");
-#endif
- goto error;
- }
-
- pnext = psgl->phead;
- while (pnext &&
- ((unsigned)pnext < ((unsigned)psgl + SGL_LIST_SIZE) &&
- (pnext != sgl_addr))
- ) {
- pnext = pnext++;
- }
-
- if (pnext == sgl_addr) { /* found the sgl descriptor */
-
- *src_addr = pnext->src_addr;
- *dst_addr = pnext->dst_addr;
-
- /*
- * Now search the remaining descriptors and add their count.
- * We already have the remaining count from this descriptor in
- * count_left.
- */
- pnext++;
-
- while ((pnext != psgl->ptail) &&
- ((unsigned)pnext < ((unsigned)psgl + SGL_LIST_SIZE))
- ) {
- count_left += pnext->control_count & SG_COUNT_MASK;
- }
-
- if (pnext != psgl->ptail) { /* should never happen */
-#ifdef DEBUG_405DMA
- printk("get_dma_sgl_residue error (1) psgl->ptail 0x%x handle 0x%x\n",
- (unsigned int)psgl->ptail,
- (unsigned int)handle);
-#endif
- goto error;
- }
-
- /* success */
- p_dma_ch = &dma_channels[psgl->dmanr];
- return (count_left << p_dma_ch->shift); /* count in bytes */
-
- } else {
- /* this shouldn't happen */
-#ifdef DEBUG_405DMA
- printk("get_dma_sgl_residue, unable to match current address 0x%x, handle 0x%x\n",
- (unsigned int)sgl_addr, (unsigned int)handle);
-
-#endif
- }
-
-
-error:
- *src_addr = (dma_addr_t)NULL;
- *dst_addr = (dma_addr_t)NULL;
- return 0;
-}
-
-
-
-
-/*
- * Returns the address(es) of the buffer(s) contained in the head element of
- * the scatter/gather list. The element is removed from the scatter/gather
- * list and the next element becomes the head.
- *
- * This function should only be called when the DMA is not active.
- */
-static __inline__ int
-delete_405gp_dma_sgl_element(sgl_handle_t handle, dma_addr_t *src_dma_addr,
- dma_addr_t *dst_dma_addr)
-{
- sgl_list_info_t *psgl = (sgl_list_info_t *)handle;
-
-#ifdef DEBUG_405DMA
- if (!handle) {
- printk("delete_sgl_element: null handle\n");
- return DMA_STATUS_BAD_HANDLE;
- } else if (psgl->dmanr > (MAX_405GP_DMA_CHANNELS - 1)) {
- printk("delete_sgl_element: bad channel in handle %d\n",
- psgl->dmanr);
- return DMA_STATUS_BAD_CHANNEL;
- }
-#endif
-
- if (!psgl->phead) {
-#ifdef DEBUG_405DMA
- printk("delete_sgl_element: sgl list empty\n");
-#endif
- *src_dma_addr = (dma_addr_t)NULL;
- *dst_dma_addr = (dma_addr_t)NULL;
- return DMA_STATUS_SGL_LIST_EMPTY;
- }
-
- *src_dma_addr = (dma_addr_t)psgl->phead->src_addr;
- *dst_dma_addr = (dma_addr_t)psgl->phead->dst_addr;
-
- if (psgl->phead == psgl->ptail) {
- /* last descriptor on the list */
- psgl->phead = NULL;
- psgl->ptail = NULL;
- } else {
- psgl->phead++;
- }
-
- return DMA_STATUS_GOOD;
-}
-
-#endif /* DCRNCAP_DMA_SG */
-
-/*
- * The rest of the DMA API, in ppc405_dma.c
- */
-extern int hw_init_dma_channel(unsigned int, ppc_dma_ch_t *);
-extern int get_channel_config(unsigned int, ppc_dma_ch_t *);
-extern int set_channel_priority(unsigned int, unsigned int);
-extern unsigned int get_peripheral_width(unsigned int);
-extern int alloc_dma_handle(sgl_handle_t *, unsigned int, unsigned int);
-extern void free_dma_handle(sgl_handle_t);
-
-#endif
-#endif /* __KERNEL__ */
diff -Nru a/include/asm-ppc/ppc4xx_dma.h b/include/asm-ppc/ppc4xx_dma.h
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/include/asm-ppc/ppc4xx_dma.h Fri Aug 6 16:24:56 2004
@@ -0,0 +1,570 @@
+/*
+ * include/asm-ppc/ppc4xx_dma.h
+ *
+ * IBM PPC4xx DMA engine library
+ *
+ * Copyright 2000-2004 MontaVista Software Inc.
+ *
+ * Cleaned up a bit more, Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Original code by Armin Kuster <akuster@mvista.com>
+ * and Pete Popov <ppopov@mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifdef __KERNEL__
+#ifndef __ASMPPC_PPC4xx_DMA_H
+#define __ASMPPC_PPC4xx_DMA_H
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <asm/mmu.h>
+#include <asm/ibm4xx.h>
+
+#undef DEBUG_4xxDMA
+
+#define MAX_PPC4xx_DMA_CHANNELS 4
+
+/* in arch/ppc/kernel/setup.c -- Cort */
+extern unsigned long DMA_MODE_WRITE, DMA_MODE_READ;
+
+/*
+ * Function return status codes
+ * These values are used to indicate whether or not the function
+ * call was successful, or a bad/invalid parameter was passed.
+ */
+#define DMA_STATUS_GOOD 0
+#define DMA_STATUS_BAD_CHANNEL 1
+#define DMA_STATUS_BAD_HANDLE 2
+#define DMA_STATUS_BAD_MODE 3
+#define DMA_STATUS_NULL_POINTER 4
+#define DMA_STATUS_OUT_OF_MEMORY 5
+#define DMA_STATUS_SGL_LIST_EMPTY 6
+#define DMA_STATUS_GENERAL_ERROR 7
+#define DMA_STATUS_CHANNEL_NOTFREE 8
+
+#define DMA_CHANNEL_BUSY 0x80000000
+
+/*
+ * These indicate status as returned from the DMA Status Register.
+ */
+#define DMA_STATUS_NO_ERROR 0
+#define DMA_STATUS_CS 1 /* Count Status */
+#define DMA_STATUS_TS 2 /* Transfer Status */
+#define DMA_STATUS_DMA_ERROR 3 /* DMA Error Occurred */
+#define DMA_STATUS_DMA_BUSY 4 /* The channel is busy */
+
+
+/*
+ * DMA Channel Control Registers
+ */
+
+#ifdef CONFIG_44x
+#define PPC4xx_DMA_64BIT
+#define DMA_CR_OFFSET 1
+#else
+#define DMA_CR_OFFSET 0
+#endif
+
+#define DMA_CE_ENABLE (1<<31) /* DMA Channel Enable */
+#define SET_DMA_CE_ENABLE(x) (((x)&0x1)<<31)
+#define GET_DMA_CE_ENABLE(x) (((x)&DMA_CE_ENABLE)>>31)
+
+#define DMA_CIE_ENABLE (1<<30) /* DMA Channel Interrupt Enable */
+#define SET_DMA_CIE_ENABLE(x) (((x)&0x1)<<30)
+#define GET_DMA_CIE_ENABLE(x) (((x)&DMA_CIE_ENABLE)>>30)
+
+#define DMA_TD (1<<29)
+#define SET_DMA_TD(x) (((x)&0x1)<<29)
+#define GET_DMA_TD(x) (((x)&DMA_TD)>>29)
+
+#define DMA_PL (1<<28) /* Peripheral Location */
+#define SET_DMA_PL(x) (((x)&0x1)<<28)
+#define GET_DMA_PL(x) (((x)&DMA_PL)>>28)
+
+#define EXTERNAL_PERIPHERAL 0
+#define INTERNAL_PERIPHERAL 1
+
+#define SET_DMA_PW(x) (((x)&0x3)<<(26-DMA_CR_OFFSET)) /* Peripheral Width */
+#define DMA_PW_MASK SET_DMA_PW(3)
+#define PW_8 0
+#define PW_16 1
+#define PW_32 2
+#define PW_64 3
+/* FIXME: Add PW_128 support for 440GP DMA block */
+#define GET_DMA_PW(x) (((x)&DMA_PW_MASK)>>(26-DMA_CR_OFFSET))
+
+#define DMA_DAI (1<<(25-DMA_CR_OFFSET)) /* Destination Address Increment */
+#define SET_DMA_DAI(x) (((x)&0x1)<<(25-DMA_CR_OFFSET))
+
+#define DMA_SAI (1<<(24-DMA_CR_OFFSET)) /* Source Address Increment */
+#define SET_DMA_SAI(x) (((x)&0x1)<<(24-DMA_CR_OFFSET))
+
+#define DMA_BEN (1<<(23-DMA_CR_OFFSET)) /* Buffer Enable */
+#define SET_DMA_BEN(x) (((x)&0x1)<<(23-DMA_CR_OFFSET))
+
+#define SET_DMA_TM(x) (((x)&0x3)<<(21-DMA_CR_OFFSET)) /* Transfer Mode */
+#define DMA_TM_MASK SET_DMA_TM(3)
+#define TM_PERIPHERAL 0 /* Peripheral */
+#define TM_RESERVED 1 /* Reserved */
+#define TM_S_MM 2 /* Memory to Memory */
+#define TM_D_MM 3 /* Device Paced Memory to Memory */
+#define GET_DMA_TM(x) (((x)&DMA_TM_MASK)>>(21-DMA_CR_OFFSET))
+
+#define SET_DMA_PSC(x) (((x)&0x3)<<(19-DMA_CR_OFFSET)) /* Peripheral Setup Cycles */
+#define DMA_PSC_MASK SET_DMA_PSC(3)
+#define GET_DMA_PSC(x) (((x)&DMA_PSC_MASK)>>(19-DMA_CR_OFFSET))
+
+#define SET_DMA_PWC(x) (((x)&0x3F)<<(13-DMA_CR_OFFSET)) /* Peripheral Wait Cycles */
+#define DMA_PWC_MASK SET_DMA_PWC(0x3F)
+#define GET_DMA_PWC(x) (((x)&DMA_PWC_MASK)>>(13-DMA_CR_OFFSET))
+
+#define SET_DMA_PHC(x) (((x)&0x7)<<(10-DMA_CR_OFFSET)) /* Peripheral Hold Cycles */
+#define DMA_PHC_MASK SET_DMA_PHC(0x7)
+#define GET_DMA_PHC(x) (((x)&DMA_PHC_MASK)>>(10-DMA_CR_OFFSET))
+
+#define DMA_ETD_OUTPUT (1<<(9-DMA_CR_OFFSET)) /* EOT pin is a TC output */
+#define SET_DMA_ETD(x) (((x)&0x1)<<(9-DMA_CR_OFFSET))
+
+#define DMA_TCE_ENABLE (1<<(8-DMA_CR_OFFSET))
+#define SET_DMA_TCE(x) (((x)&0x1)<<(8-DMA_CR_OFFSET))
+
+#define DMA_DEC (1<<(2) /* Address Decrement */
+#define SET_DMA_DEC(x) (((x)&0x1)<<2)
+#define GET_DMA_DEC(x) (((x)&DMA_DEC)>>2)
+
+/*
+ * Transfer Modes
+ * These modes are defined in a way that makes it possible to
+ * simply "or" in the value in the control register.
+ */
+
+#define DMA_MODE_MM (SET_DMA_TM(TM_S_MM)) /* memory to memory */
+
+ /* Device-paced memory to memory, */
+ /* device is at source address */
+#define DMA_MODE_MM_DEVATSRC (DMA_TD | SET_DMA_TM(TM_D_MM))
+
+ /* Device-paced memory to memory, */
+ /* device is at destination address */
+#define DMA_MODE_MM_DEVATDST (SET_DMA_TM(TM_D_MM))
+
+/* 405gp/440gp */
+#define SET_DMA_PREFETCH(x) (((x)&0x3)<<(4-DMA_CR_OFFSET)) /* Memory Read Prefetch */
+#define DMA_PREFETCH_MASK SET_DMA_PREFETCH(3)
+#define PREFETCH_1 0 /* Prefetch 1 Double Word */
+#define PREFETCH_2 1
+#define PREFETCH_4 2
+#define GET_DMA_PREFETCH(x) (((x)&DMA_PREFETCH_MASK)>>(4-DMA_CR_OFFSET))
+
+#define DMA_PCE (1<<(3-DMA_CR_OFFSET)) /* Parity Check Enable */
+#define SET_DMA_PCE(x) (((x)&0x1)<<(3-DMA_CR_OFFSET))
+#define GET_DMA_PCE(x) (((x)&DMA_PCE)>>(3-DMA_CR_OFFSET))
+
+/* stb3x */
+
+#define DMA_ECE_ENABLE (1<<5)
+#define SET_DMA_ECE(x) (((x)&0x1)<<5)
+#define GET_DMA_ECE(x) (((x)&DMA_ECE_ENABLE)>>5)
+
+#define DMA_TCD_DISABLE (1<<4)
+#define SET_DMA_TCD(x) (((x)&0x1)<<4)
+#define GET_DMA_TCD(x) (((x)&DMA_TCD_DISABLE)>>4)
+
+typedef uint32_t sgl_handle_t;
+
+#ifdef CONFIG_PPC4xx_EDMA
+
+#define SGL_LIST_SIZE 4096
+#define DMA_PPC4xx_SIZE SGL_LIST_SIZE
+
+#define SET_DMA_PRIORITY(x) (((x)&0x3)<<(6-DMA_CR_OFFSET)) /* DMA Channel Priority */
+#define DMA_PRIORITY_MASK SET_DMA_PRIORITY(3)
+#define PRIORITY_LOW 0
+#define PRIORITY_MID_LOW 1
+#define PRIORITY_MID_HIGH 2
+#define PRIORITY_HIGH 3
+#define GET_DMA_PRIORITY(x) (((x)&DMA_PRIORITY_MASK)>>(6-DMA_CR_OFFSET))
+
+/*
+ * DMA Polarity Configuration Register
+ */
+#define DMAReq_ActiveLow(chan) (1<<(31-(chan*3)))
+#define DMAAck_ActiveLow(chan) (1<<(30-(chan*3)))
+#define EOT_ActiveLow(chan) (1<<(29-(chan*3))) /* End of Transfer */
+
+/*
+ * DMA Sleep Mode Register
+ */
+#define SLEEP_MODE_ENABLE (1<<21)
+
+/*
+ * DMA Status Register
+ */
+#define DMA_CS0 (1<<31) /* Terminal Count has been reached */
+#define DMA_CS1 (1<<30)
+#define DMA_CS2 (1<<29)
+#define DMA_CS3 (1<<28)
+
+#define DMA_TS0 (1<<27) /* End of Transfer has been requested */
+#define DMA_TS1 (1<<26)
+#define DMA_TS2 (1<<25)
+#define DMA_TS3 (1<<24)
+
+#define DMA_CH0_ERR (1<<23) /* DMA Chanel 0 Error */
+#define DMA_CH1_ERR (1<<22)
+#define DMA_CH2_ERR (1<<21)
+#define DMA_CH3_ERR (1<<20)
+
+#define DMA_IN_DMA_REQ0 (1<<19) /* Internal DMA Request is pending */
+#define DMA_IN_DMA_REQ1 (1<<18)
+#define DMA_IN_DMA_REQ2 (1<<17)
+#define DMA_IN_DMA_REQ3 (1<<16)
+
+#define DMA_EXT_DMA_REQ0 (1<<15) /* External DMA Request is pending */
+#define DMA_EXT_DMA_REQ1 (1<<14)
+#define DMA_EXT_DMA_REQ2 (1<<13)
+#define DMA_EXT_DMA_REQ3 (1<<12)
+
+#define DMA_CH0_BUSY (1<<11) /* DMA Channel 0 Busy */
+#define DMA_CH1_BUSY (1<<10)
+#define DMA_CH2_BUSY (1<<9)
+#define DMA_CH3_BUSY (1<<8)
+
+#define DMA_SG0 (1<<7) /* DMA Channel 0 Scatter/Gather in progress */
+#define DMA_SG1 (1<<6)
+#define DMA_SG2 (1<<5)
+#define DMA_SG3 (1<<4)
+
+/*
+ * DMA SG Command Register
+ */
+#define SSG_ENABLE(chan) (1<<(31-chan)) /* Start Scatter Gather */
+#define SSG_MASK_ENABLE(chan) (1<<(15-chan)) /* Enable writing to SSG0 bit */
+
+/*
+ * DMA Scatter/Gather Descriptor Bit fields
+ */
+#define SG_LINK (1<<31) /* Link */
+#define SG_TCI_ENABLE (1<<29) /* Enable Terminal Count Interrupt */
+#define SG_ETI_ENABLE (1<<28) /* Enable End of Transfer Interrupt */
+#define SG_ERI_ENABLE (1<<27) /* Enable Error Interrupt */
+#define SG_COUNT_MASK 0xFFFF /* Count Field */
+
+#define SET_DMA_CONTROL \
+ (SET_DMA_CIE_ENABLE(p_init->int_enable) | /* interrupt enable */ \
+ SET_DMA_BEN(p_init->buffer_enable) | /* buffer enable */\
+ SET_DMA_ETD(p_init->etd_output) | /* end of transfer pin */ \
+ SET_DMA_TCE(p_init->tce_enable) | /* terminal count enable */ \
+ SET_DMA_PL(p_init->pl) | /* peripheral location */ \
+ SET_DMA_DAI(p_init->dai) | /* dest addr increment */ \
+ SET_DMA_SAI(p_init->sai) | /* src addr increment */ \
+ SET_DMA_PRIORITY(p_init->cp) | /* channel priority */ \
+ SET_DMA_PW(p_init->pwidth) | /* peripheral/bus width */ \
+ SET_DMA_PSC(p_init->psc) | /* peripheral setup cycles */ \
+ SET_DMA_PWC(p_init->pwc) | /* peripheral wait cycles */ \
+ SET_DMA_PHC(p_init->phc) | /* peripheral hold cycles */ \
+ SET_DMA_PREFETCH(p_init->pf) /* read prefetch */)
+
+#define GET_DMA_POLARITY(chan) (DMAReq_ActiveLow(chan) | DMAAck_ActiveLow(chan) | EOT_ActiveLow(chan))
+
+#elif defined(CONFIG_STBXXX_DMA) /* stb03xxx */
+
+#define DMA_PPC4xx_SIZE 4096
+
+/*
+ * DMA Status Register
+ */
+
+#define SET_DMA_PRIORITY(x) (((x)&0x00800001)) /* DMA Channel Priority */
+#define DMA_PRIORITY_MASK 0x00800001
+#define PRIORITY_LOW 0x00000000
+#define PRIORITY_MID_LOW 0x00000001
+#define PRIORITY_MID_HIGH 0x00800000
+#define PRIORITY_HIGH 0x00800001
+#define GET_DMA_PRIORITY(x) (((((x)&DMA_PRIORITY_MASK) &0x00800000) >> 22 ) | (((x)&DMA_PRIORITY_MASK) &0x00000001))
+
+#define DMA_CS0 (1<<31) /* Terminal Count has been reached */
+#define DMA_CS1 (1<<30)
+#define DMA_CS2 (1<<29)
+#define DMA_CS3 (1<<28)
+
+#define DMA_TS0 (1<<27) /* End of Transfer has been requested */
+#define DMA_TS1 (1<<26)
+#define DMA_TS2 (1<<25)
+#define DMA_TS3 (1<<24)
+
+#define DMA_CH0_ERR (1<<23) /* DMA Chanel 0 Error */
+#define DMA_CH1_ERR (1<<22)
+#define DMA_CH2_ERR (1<<21)
+#define DMA_CH3_ERR (1<<20)
+
+#define DMA_CT0 (1<<19) /* Chained transfere */
+
+#define DMA_IN_DMA_REQ0 (1<<18) /* Internal DMA Request is pending */
+#define DMA_IN_DMA_REQ1 (1<<17)
+#define DMA_IN_DMA_REQ2 (1<<16)
+#define DMA_IN_DMA_REQ3 (1<<15)
+
+#define DMA_EXT_DMA_REQ0 (1<<14) /* External DMA Request is pending */
+#define DMA_EXT_DMA_REQ1 (1<<13)
+#define DMA_EXT_DMA_REQ2 (1<<12)
+#define DMA_EXT_DMA_REQ3 (1<<11)
+
+#define DMA_CH0_BUSY (1<<10) /* DMA Channel 0 Busy */
+#define DMA_CH1_BUSY (1<<9)
+#define DMA_CH2_BUSY (1<<8)
+#define DMA_CH3_BUSY (1<<7)
+
+#define DMA_CT1 (1<<6) /* Chained transfere */
+#define DMA_CT2 (1<<5)
+#define DMA_CT3 (1<<4)
+
+#define DMA_CH_ENABLE (1<<7)
+#define SET_DMA_CH(x) (((x)&0x1)<<7)
+#define GET_DMA_CH(x) (((x)&DMA_CH_ENABLE)>>7)
+
+/* STBx25xxx dma unique */
+/* enable device port on a dma channel
+ * example ext 0 on dma 1
+ */
+
+#define SSP0_RECV 15
+#define SSP0_XMIT 14
+#define EXT_DMA_0 12
+#define SC1_XMIT 11
+#define SC1_RECV 10
+#define EXT_DMA_2 9
+#define EXT_DMA_3 8
+#define SERIAL2_XMIT 7
+#define SERIAL2_RECV 6
+#define SC0_XMIT 5
+#define SC0_RECV 4
+#define SERIAL1_XMIT 3
+#define SERIAL1_RECV 2
+#define SERIAL0_XMIT 1
+#define SERIAL0_RECV 0
+
+#define DMA_CHAN_0 1
+#define DMA_CHAN_1 2
+#define DMA_CHAN_2 3
+#define DMA_CHAN_3 4
+
+/* end STBx25xx */
+
+/*
+ * Bit 30 must be one for Redwoods, otherwise transfers may receive errors.
+ */
+#define DMA_CR_MB0 0x2
+
+#define SET_DMA_CONTROL \
+ (SET_DMA_CIE_ENABLE(p_init->int_enable) | /* interrupt enable */ \
+ SET_DMA_ETD(p_init->etd_output) | /* end of transfer pin */ \
+ SET_DMA_TCE(p_init->tce_enable) | /* terminal count enable */ \
+ SET_DMA_PL(p_init->pl) | /* peripheral location */ \
+ SET_DMA_DAI(p_init->dai) | /* dest addr increment */ \
+ SET_DMA_SAI(p_init->sai) | /* src addr increment */ \
+ SET_DMA_PRIORITY(p_init->cp) | /* channel priority */ \
+ SET_DMA_PW(p_init->pwidth) | /* peripheral/bus width */ \
+ SET_DMA_PSC(p_init->psc) | /* peripheral setup cycles */ \
+ SET_DMA_PWC(p_init->pwc) | /* peripheral wait cycles */ \
+ SET_DMA_PHC(p_init->phc) | /* peripheral hold cycles */ \
+ SET_DMA_TCD(p_init->tcd_disable) | /* TC chain mode disable */ \
+ SET_DMA_ECE(p_init->ece_enable) | /* ECE chanin mode enable */ \
+ SET_DMA_CH(p_init->ch_enable) | /* Chain enable */ \
+ DMA_CR_MB0 /* must be one */)
+
+#define GET_DMA_POLARITY(chan) chan
+
+#endif
+
+typedef struct {
+ unsigned short in_use; /* set when channel is being used, clr when
+ * available.
+ */
+ /*
+ * Valid polarity settings:
+ * DMAReq_ActiveLow(n)
+ * DMAAck_ActiveLow(n)
+ * EOT_ActiveLow(n)
+ *
+ * n is 0 to max dma chans
+ */
+ unsigned int polarity;
+
+ char buffer_enable; /* Boolean: buffer enable */
+ char tce_enable; /* Boolean: terminal count enable */
+ char etd_output; /* Boolean: eot pin is a tc output */
+ char pce; /* Boolean: parity check enable */
+
+ /*
+ * Peripheral location:
+ * INTERNAL_PERIPHERAL (UART0 on the 405GP)
+ * EXTERNAL_PERIPHERAL
+ */
+ char pl; /* internal/external peripheral */
+
+ /*
+ * Valid pwidth settings:
+ * PW_8
+ * PW_16
+ * PW_32
+ * PW_64
+ */
+ unsigned int pwidth;
+
+ char dai; /* Boolean: dst address increment */
+ char sai; /* Boolean: src address increment */
+
+ /*
+ * Valid psc settings: 0-3
+ */
+ unsigned int psc; /* Peripheral Setup Cycles */
+
+ /*
+ * Valid pwc settings:
+ * 0-63
+ */
+ unsigned int pwc; /* Peripheral Wait Cycles */
+
+ /*
+ * Valid phc settings:
+ * 0-7
+ */
+ unsigned int phc; /* Peripheral Hold Cycles */
+
+ /*
+ * Valid cp (channel priority) settings:
+ * PRIORITY_LOW
+ * PRIORITY_MID_LOW
+ * PRIORITY_MID_HIGH
+ * PRIORITY_HIGH
+ */
+ unsigned int cp; /* channel priority */
+
+ /*
+ * Valid pf (memory read prefetch) settings:
+ *
+ * PREFETCH_1
+ * PREFETCH_2
+ * PREFETCH_4
+ */
+ unsigned int pf; /* memory read prefetch */
+
+ /*
+ * Boolean: channel interrupt enable
+ * NOTE: for sgl transfers, only the last descriptor will be setup to
+ * interrupt.
+ */
+ char int_enable;
+
+ char shift; /* easy access to byte_count shift, based on */
+ /* the width of the channel */
+
+ uint32_t control; /* channel control word */
+
+ /* These variabled are used ONLY in single dma transfers */
+ unsigned int mode; /* transfer mode */
+ phys_addr_t addr;
+ char ce; /* channel enable */
+#ifdef CONFIG_STB03xxx
+ char ch_enable;
+ char tcd_disable;
+ char ece_enable;
+ char td; /* transfer direction */
+#endif
+
+} ppc_dma_ch_t;
+
+/*
+ * PPC44x DMA implementations have a slightly different
+ * descriptor layout. Probably moved about due to the
+ * change to 64-bit addresses and link pointer. I don't
+ * know why they didn't just leave control_count after
+ * the dst_addr.
+ */
+#ifdef PPC4xx_DMA_64BIT
+typedef struct {
+ uint32_t control;
+ uint32_t control_count;
+ phys_addr_t src_addr;
+ phys_addr_t dst_addr;
+ phys_addr_t next;
+} ppc_sgl_t;
+#else
+typedef struct {
+ uint32_t control;
+ phys_addr_t src_addr;
+ phys_addr_t dst_addr;
+ uint32_t control_count;
+ uint32_t next;
+} ppc_sgl_t;
+#endif
+
+typedef struct {
+ unsigned int dmanr;
+ uint32_t control; /* channel ctrl word; loaded from each descrptr */
+ uint32_t sgl_control; /* LK, TCI, ETI, and ERI bits in sgl descriptor */
+ dma_addr_t dma_addr; /* dma (physical) address of this list */
+ ppc_sgl_t *phead;
+ dma_addr_t phead_dma;
+ ppc_sgl_t *ptail;
+ dma_addr_t ptail_dma;
+} sgl_list_info_t;
+
+typedef struct {
+ phys_addr_t *src_addr;
+ phys_addr_t *dst_addr;
+ phys_addr_t dma_src_addr;
+ phys_addr_t dma_dst_addr;
+} pci_alloc_desc_t;
+
+extern ppc_dma_ch_t dma_channels[];
+
+/*
+ * The DMA API are in ppc4xx_dma.c and ppc4xx_sgdma.c
+ */
+extern int ppc4xx_init_dma_channel(unsigned int, ppc_dma_ch_t *);
+extern int ppc4xx_get_channel_config(unsigned int, ppc_dma_ch_t *);
+extern int ppc4xx_set_channel_priority(unsigned int, unsigned int);
+extern unsigned int ppc4xx_get_peripheral_width(unsigned int);
+extern void ppc4xx_set_sg_addr(int, phys_addr_t);
+extern int ppc4xx_add_dma_sgl(sgl_handle_t, phys_addr_t, phys_addr_t, unsigned int);
+extern void ppc4xx_enable_dma_sgl(sgl_handle_t);
+extern void ppc4xx_disable_dma_sgl(sgl_handle_t);
+extern int ppc4xx_get_dma_sgl_residue(sgl_handle_t, phys_addr_t *, phys_addr_t *);
+extern int ppc4xx_delete_dma_sgl_element(sgl_handle_t, phys_addr_t *, phys_addr_t *);
+extern int ppc4xx_alloc_dma_handle(sgl_handle_t *, unsigned int, unsigned int);
+extern void ppc4xx_free_dma_handle(sgl_handle_t);
+extern int ppc4xx_get_dma_status(void);
+extern void ppc4xx_set_src_addr(int dmanr, phys_addr_t src_addr);
+extern void ppc4xx_set_dst_addr(int dmanr, phys_addr_t dst_addr);
+extern void ppc4xx_enable_dma(unsigned int dmanr);
+extern void ppc4xx_disable_dma(unsigned int dmanr);
+extern void ppc4xx_set_dma_count(unsigned int dmanr, unsigned int count);
+extern int ppc4xx_get_dma_residue(unsigned int dmanr);
+extern void ppc4xx_set_dma_addr2(unsigned int dmanr, phys_addr_t src_dma_addr,
+ phys_addr_t dst_dma_addr);
+extern int ppc4xx_enable_dma_interrupt(unsigned int dmanr);
+extern int ppc4xx_disable_dma_interrupt(unsigned int dmanr);
+extern int ppc4xx_clr_dma_status(unsigned int dmanr);
+extern int ppc4xx_map_dma_port(unsigned int dmanr, unsigned int ocp_dma,short dma_chan);
+extern int ppc4xx_disable_dma_port(unsigned int dmanr, unsigned int ocp_dma,short dma_chan);
+extern int ppc4xx_set_dma_mode(unsigned int dmanr, unsigned int mode);
+
+/* These are in kernel/dma.c: */
+
+/* reserve a DMA channel */
+extern int request_dma(unsigned int dmanr, const char *device_id);
+/* release it again */
+extern void free_dma(unsigned int dmanr);
+#endif
+#endif /* __KERNEL__ */
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2004-08-06 23:26 [PATCH][PPC32] Add PPC4xx DMA engine library Matt Porter
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