[PATCH v3] net: fec: add support of ethtool get_regs

[Philippe Reynes <tremyfr@gmail.com>]

This enables the ethtool's "-d" and "--register-dump"
options for fec devices.

Signed-off-by: Philippe Reynes <tremyfr@gmail.com>
---
 drivers/net/ethernet/freescale/fec_main.c |   78 +++++++++++++++++++++++++++++
 1 files changed, 78 insertions(+), 0 deletions(-)

Changelog:
v2: (thanks Russell King and David Miller for the feedback)
- don't use memcpy_fromio to copy registers
v3: (thanks David Miller for the feedback)
- only copy defined registers
- fix warning reported by checkpatch.pl

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 66d47e4..bf4cf3f 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -2118,6 +2118,82 @@ static void fec_enet_get_drvinfo(struct net_device *ndev,
 	strlcpy(info->bus_info, dev_name(&ndev->dev), sizeof(info->bus_info));
 }
 
+static int fec_enet_get_regs_len(struct net_device *ndev)
+{
+	struct fec_enet_private *fep = netdev_priv(ndev);
+	struct resource *r;
+	int s = 0;
+
+	r = platform_get_resource(fep->pdev, IORESOURCE_MEM, 0);
+	if (r)
+		s = resource_size(r);
+
+	return s;
+}
+
+/* List of registers that can be safety be read to dump them with ethtool */
+#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
+	defined(CONFIG_M520x) || defined(CONFIG_M532x) ||		\
+	defined(CONFIG_ARCH_MXC) || defined(CONFIG_SOC_IMX28)
+static u32 fec_enet_register_offset[] = {
+	FEC_IEVENT, FEC_IMASK, FEC_R_DES_ACTIVE_0, FEC_X_DES_ACTIVE_0,
+	FEC_ECNTRL, FEC_MII_DATA, FEC_MII_SPEED, FEC_MIB_CTRLSTAT, FEC_R_CNTRL,
+	FEC_X_CNTRL, FEC_ADDR_LOW, FEC_ADDR_HIGH, FEC_OPD, FEC_TXIC0, FEC_TXIC1,
+	FEC_TXIC2, FEC_RXIC0, FEC_RXIC1, FEC_RXIC2, FEC_HASH_TABLE_HIGH,
+	FEC_HASH_TABLE_LOW, FEC_GRP_HASH_TABLE_HIGH, FEC_GRP_HASH_TABLE_LOW,
+	FEC_X_WMRK, FEC_R_BOUND, FEC_R_FSTART, FEC_R_DES_START_1,
+	FEC_X_DES_START_1, FEC_R_BUFF_SIZE_1, FEC_R_DES_START_2,
+	FEC_X_DES_START_2, FEC_R_BUFF_SIZE_2, FEC_R_DES_START_0,
+	FEC_X_DES_START_0, FEC_R_BUFF_SIZE_0, FEC_R_FIFO_RSFL, FEC_R_FIFO_RSEM,
+	FEC_R_FIFO_RAEM, FEC_R_FIFO_RAFL, FEC_RACC, FEC_RCMR_1, FEC_RCMR_2,
+	FEC_DMA_CFG_1, FEC_DMA_CFG_2, FEC_R_DES_ACTIVE_1, FEC_X_DES_ACTIVE_1,
+	FEC_R_DES_ACTIVE_2, FEC_X_DES_ACTIVE_2, FEC_QOS_SCHEME,
+	RMON_T_DROP, RMON_T_PACKETS, RMON_T_BC_PKT, RMON_T_MC_PKT,
+	RMON_T_CRC_ALIGN, RMON_T_UNDERSIZE, RMON_T_OVERSIZE, RMON_T_FRAG,
+	RMON_T_JAB, RMON_T_COL, RMON_T_P64, RMON_T_P65TO127, RMON_T_P128TO255,
+	RMON_T_P256TO511, RMON_T_P512TO1023, RMON_T_P1024TO2047,
+	RMON_T_P_GTE2048, RMON_T_OCTETS,
+	IEEE_T_DROP, IEEE_T_FRAME_OK, IEEE_T_1COL, IEEE_T_MCOL, IEEE_T_DEF,
+	IEEE_T_LCOL, IEEE_T_EXCOL, IEEE_T_MACERR, IEEE_T_CSERR, IEEE_T_SQE,
+	IEEE_T_FDXFC, IEEE_T_OCTETS_OK,
+	RMON_R_PACKETS, RMON_R_BC_PKT, RMON_R_MC_PKT, RMON_R_CRC_ALIGN,
+	RMON_R_UNDERSIZE, RMON_R_OVERSIZE, RMON_R_FRAG, RMON_R_JAB,
+	RMON_R_RESVD_O, RMON_R_P64, RMON_R_P65TO127, RMON_R_P128TO255,
+	RMON_R_P256TO511, RMON_R_P512TO1023, RMON_R_P1024TO2047,
+	RMON_R_P_GTE2048, RMON_R_OCTETS,
+	IEEE_R_DROP, IEEE_R_FRAME_OK, IEEE_R_CRC, IEEE_R_ALIGN, IEEE_R_MACERR,
+	IEEE_R_FDXFC, IEEE_R_OCTETS_OK
+};
+#else
+static u32 fec_enet_register_offset[] = {
+	FEC_ECNTRL, FEC_IEVENT, FEC_IMASK, FEC_IVEC, FEC_R_DES_ACTIVE_0,
+	FEC_R_DES_ACTIVE_1, FEC_R_DES_ACTIVE_2, FEC_X_DES_ACTIVE_0,
+	FEC_X_DES_ACTIVE_1, FEC_X_DES_ACTIVE_2, FEC_MII_DATA, FEC_MII_SPEED,
+	FEC_R_BOUND, FEC_R_FSTART, FEC_X_WMRK, FEC_X_FSTART, FEC_R_CNTRL,
+	FEC_MAX_FRM_LEN, FEC_X_CNTRL, FEC_ADDR_LOW, FEC_ADDR_HIGH,
+	FEC_GRP_HASH_TABLE_HIGH, FEC_GRP_HASH_TABLE_LOW, FEC_R_DES_START_0,
+	FEC_R_DES_START_1, FEC_R_DES_START_2, FEC_X_DES_START_0,
+	FEC_X_DES_START_1, FEC_X_DES_START_2, FEC_R_BUFF_SIZE_0,
+	FEC_R_BUFF_SIZE_1, FEC_R_BUFF_SIZE_2
+};
+#endif
+
+static void fec_enet_get_regs(struct net_device *ndev,
+			      struct ethtool_regs *regs, void *regbuf)
+{
+	struct fec_enet_private *fep = netdev_priv(ndev);
+	u32 __iomem *theregs = (u32 __iomem *)fep->hwp;
+	u32 *buf = (u32 *)regbuf;
+	u32 i, off;
+
+	memset(buf, 0, regs->len);
+
+	for (i = 0; i < ARRAY_SIZE(fec_enet_register_offset); i++) {
+		off = fec_enet_register_offset[i] / 4;
+		buf[off] = readl(&theregs[off]);
+	}
+}
+
 static int fec_enet_get_ts_info(struct net_device *ndev,
 				struct ethtool_ts_info *info)
 {
@@ -2515,6 +2591,8 @@ static const struct ethtool_ops fec_enet_ethtool_ops = {
 	.get_settings		= fec_enet_get_settings,
 	.set_settings		= fec_enet_set_settings,
 	.get_drvinfo		= fec_enet_get_drvinfo,
+	.get_regs_len		= fec_enet_get_regs_len,
+	.get_regs		= fec_enet_get_regs,
 	.nway_reset		= fec_enet_nway_reset,
 	.get_link		= ethtool_op_get_link,
 	.get_coalesce		= fec_enet_get_coalesce,
-- 
1.7.4.4