[PATCH net-next 18/26] net: stmmac: dwxgmac: Add Flexible PPS support

[Jose Abreu <Jose.Abreu@synopsys.com>]

Add the support for Flexible PPS in XGMAC cores.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
---
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Jose Abreu <joabreu@synopsys.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: netdev@vger.kernel.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h     | 19 ++++++++
 .../net/ethernet/stmicro/stmmac/dwxgmac2_core.c    | 56 ++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
index 067cedb48706..473d66cbfc75 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
@@ -149,6 +149,25 @@
 #define XGMAC_TXTIMESTAMP_NSEC		0x00000d30
 #define XGMAC_TXTSSTSLO			GENMASK(30, 0)
 #define XGMAC_TXTIMESTAMP_SEC		0x00000d34
+#define XGMAC_PPS_CONTROL		0x00000d70
+#define XGMAC_PPS_MAXIDX(x)		((((x) + 1) * 8) - 1)
+#define XGMAC_PPS_MINIDX(x)		((x) * 8)
+#define XGMAC_PPSx_MASK(x)		\
+	GENMASK(XGMAC_PPS_MAXIDX(x), XGMAC_PPS_MINIDX(x))
+#define XGMAC_TRGTMODSELx(x, val)	\
+	GENMASK(XGMAC_PPS_MAXIDX(x) - 1, XGMAC_PPS_MAXIDX(x) - 2) & \
+	((val) << (XGMAC_PPS_MAXIDX(x) - 2))
+#define XGMAC_PPSCMDx(x, val)		\
+	GENMASK(XGMAC_PPS_MINIDX(x) + 3, XGMAC_PPS_MINIDX(x)) & \
+	((val) << XGMAC_PPS_MINIDX(x))
+#define XGMAC_PPSCMD_START		0x2
+#define XGMAC_PPSCMD_STOP		0x5
+#define XGMAC_PPSEN0			BIT(4)
+#define XGMAC_PPSx_TARGET_TIME_SEC(x)	(0x00000d80 + (x) * 0x10)
+#define XGMAC_PPSx_TARGET_TIME_NSEC(x)	(0x00000d84 + (x) * 0x10)
+#define XGMAC_TRGTBUSY0			BIT(31)
+#define XGMAC_PPSx_INTERVAL(x)		(0x00000d88 + (x) * 0x10)
+#define XGMAC_PPSx_WIDTH(x)		(0x00000d8c + (x) * 0x10)
 
 /* MTL Registers */
 #define XGMAC_MTL_OPMODE		0x00001000
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
index 1161287d3a62..3708cdb16ff7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
@@ -8,6 +8,7 @@
 #include <linux/crc32.h>
 #include <linux/iopoll.h>
 #include "stmmac.h"
+#include "stmmac_ptp.h"
 #include "dwxgmac2.h"
 
 static void dwxgmac2_core_init(struct mac_device_info *hw,
@@ -1018,6 +1019,60 @@ static int dwxgmac2_get_mac_tx_timestamp(struct mac_device_info *hw, u64 *ts)
 	return -EBUSY;
 }
 
+static int dwxgmac2_flex_pps_config(void __iomem *ioaddr, int index,
+				    struct stmmac_pps_cfg *cfg, bool enable,
+				    u32 sub_second_inc, u32 systime_flags)
+{
+	u32 tnsec = readl(ioaddr + XGMAC_PPSx_TARGET_TIME_NSEC(index));
+	u32 val = readl(ioaddr + XGMAC_PPS_CONTROL);
+	u64 period;
+
+	if (!cfg->available)
+		return -EINVAL;
+	if (tnsec & XGMAC_TRGTBUSY0)
+		return -EBUSY;
+	if (!sub_second_inc || !systime_flags)
+		return -EINVAL;
+
+	val &= ~XGMAC_PPSx_MASK(index);
+
+	if (!enable) {
+		val |= XGMAC_PPSCMDx(index, XGMAC_PPSCMD_STOP);
+		writel(val, ioaddr + XGMAC_PPS_CONTROL);
+		return 0;
+	}
+
+	val |= XGMAC_PPSCMDx(index, XGMAC_PPSCMD_START);
+	val |= XGMAC_TRGTMODSELx(index, XGMAC_PPSCMD_START);
+	val |= XGMAC_PPSEN0;
+
+	writel(cfg->start.tv_sec, ioaddr + XGMAC_PPSx_TARGET_TIME_SEC(index));
+
+	if (!(systime_flags & PTP_TCR_TSCTRLSSR))
+		cfg->start.tv_nsec = (cfg->start.tv_nsec * 1000) / 465;
+	writel(cfg->start.tv_nsec, ioaddr + XGMAC_PPSx_TARGET_TIME_NSEC(index));
+
+	period = cfg->period.tv_sec * 1000000000;
+	period += cfg->period.tv_nsec;
+
+	do_div(period, sub_second_inc);
+
+	if (period <= 1)
+		return -EINVAL;
+
+	writel(period - 1, ioaddr + XGMAC_PPSx_INTERVAL(index));
+
+	period >>= 1;
+	if (period <= 1)
+		return -EINVAL;
+
+	writel(period - 1, ioaddr + XGMAC_PPSx_WIDTH(index));
+
+	/* Finally, activate it */
+	writel(val, ioaddr + XGMAC_PPS_CONTROL);
+	return 0;
+}
+
 const struct stmmac_ops dwxgmac210_ops = {
 	.core_init = dwxgmac2_core_init,
 	.set_mac = dwxgmac2_set_mac,
@@ -1055,6 +1110,7 @@ const struct stmmac_ops dwxgmac210_ops = {
 	.update_vlan_hash = dwxgmac2_update_vlan_hash,
 	.rxp_config = dwxgmac3_rxp_config,
 	.get_mac_tx_timestamp = dwxgmac2_get_mac_tx_timestamp,
+	.flex_pps_config = dwxgmac2_flex_pps_config,
 };
 
 int dwxgmac2_setup(struct stmmac_priv *priv)
-- 
2.7.4