net: ethernet: ti: cpsw: introduce mac sl module api

The MAC SL submodule has a lot of common functions between many of TI SoCs
AM335x/AM437x/DRA7(AM57xx), Keystone 2 66AK2HK/E/L/G and K3 AM654, but
there are also differences especially in registers offsets and sets of
supported functions.

This patch introduces the MAC SL submodule API which is intended to provide
a common way to access the MAC SL submodule and hide HW integrations
details.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 401 insertions, 0 deletions

diff --git a/drivers/net/ethernet/ti/cpsw_sl.c b/drivers/net/ethernet/ti/cpsw_sl.c
new file mode 100644
index 000000000000..0c7531cb0f39
--- /dev/null
+++ b/drivers/net/ethernet/ti/cpsw_sl.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Texas Instruments Ethernet Switch media-access-controller (MAC) submodule/
+ * Ethernet MAC Sliver (CPGMAC_SL)
+ *
+ * Copyright (C) 2019 Texas Instruments
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+
+#include "cpsw_sl.h"
+
+#define CPSW_SL_REG_NOTUSED U16_MAX
+
+static const u16 cpsw_sl_reg_map_cpsw[] = {
+	[CPSW_SL_IDVER] = 0x00,
+	[CPSW_SL_MACCONTROL] = 0x04,
+	[CPSW_SL_MACSTATUS] = 0x08,
+	[CPSW_SL_SOFT_RESET] = 0x0c,
+	[CPSW_SL_RX_MAXLEN] = 0x10,
+	[CPSW_SL_BOFFTEST] = 0x14,
+	[CPSW_SL_RX_PAUSE] = 0x18,
+	[CPSW_SL_TX_PAUSE] = 0x1c,
+	[CPSW_SL_EMCONTROL] = 0x20,
+	[CPSW_SL_RX_PRI_MAP] = 0x24,
+	[CPSW_SL_TX_GAP] = 0x28,
+};
+
+static const u16 cpsw_sl_reg_map_66ak2hk[] = {
+	[CPSW_SL_IDVER] = 0x00,
+	[CPSW_SL_MACCONTROL] = 0x04,
+	[CPSW_SL_MACSTATUS] = 0x08,
+	[CPSW_SL_SOFT_RESET] = 0x0c,
+	[CPSW_SL_RX_MAXLEN] = 0x10,
+	[CPSW_SL_BOFFTEST] = CPSW_SL_REG_NOTUSED,
+	[CPSW_SL_RX_PAUSE] = 0x18,
+	[CPSW_SL_TX_PAUSE] = 0x1c,
+	[CPSW_SL_EMCONTROL] = 0x20,
+	[CPSW_SL_RX_PRI_MAP] = 0x24,
+	[CPSW_SL_TX_GAP] = CPSW_SL_REG_NOTUSED,
+};
+
+static const u16 cpsw_sl_reg_map_66ak2x_xgbe[] = {
+	[CPSW_SL_IDVER] = 0x00,
+	[CPSW_SL_MACCONTROL] = 0x04,
+	[CPSW_SL_MACSTATUS] = 0x08,
+	[CPSW_SL_SOFT_RESET] = 0x0c,
+	[CPSW_SL_RX_MAXLEN] = 0x10,
+	[CPSW_SL_BOFFTEST] = CPSW_SL_REG_NOTUSED,
+	[CPSW_SL_RX_PAUSE] = 0x18,
+	[CPSW_SL_TX_PAUSE] = 0x1c,
+	[CPSW_SL_EMCONTROL] = 0x20,
+	[CPSW_SL_RX_PRI_MAP] = CPSW_SL_REG_NOTUSED,
+	[CPSW_SL_TX_GAP] = 0x28,
+};
+
+static const u16 cpsw_sl_reg_map_66ak2elg_am65[] = {
+	[CPSW_SL_IDVER] = CPSW_SL_REG_NOTUSED,
+	[CPSW_SL_MACCONTROL] = 0x00,
+	[CPSW_SL_MACSTATUS] = 0x04,
+	[CPSW_SL_SOFT_RESET] = 0x08,
+	[CPSW_SL_RX_MAXLEN] = CPSW_SL_REG_NOTUSED,
+	[CPSW_SL_BOFFTEST] = 0x0c,
+	[CPSW_SL_RX_PAUSE] = 0x10,
+	[CPSW_SL_TX_PAUSE] = 0x40,
+	[CPSW_SL_EMCONTROL] = 0x70,
+	[CPSW_SL_RX_PRI_MAP] = CPSW_SL_REG_NOTUSED,
+	[CPSW_SL_TX_GAP] = 0x74,
+};
+
+#define CPSW_SL_SOFT_RESET_BIT		BIT(0)
+
+#define CPSW_SL_STATUS_PN_IDLE		BIT(31)
+#define CPSW_SL_AM65_STATUS_PN_E_IDLE	BIT(30)
+#define CPSW_SL_AM65_STATUS_PN_P_IDLE	BIT(29)
+#define CPSW_SL_AM65_STATUS_PN_TX_IDLE	BIT(28)
+
+#define CPSW_SL_STATUS_IDLE_MASK_BASE (CPSW_SL_STATUS_PN_IDLE)
+
+#define CPSW_SL_STATUS_IDLE_MASK_K3 \
+	(CPSW_SL_STATUS_IDLE_MASK_BASE | CPSW_SL_AM65_STATUS_PN_E_IDLE | \
+	 CPSW_SL_AM65_STATUS_PN_P_IDLE | CPSW_SL_AM65_STATUS_PN_TX_IDLE)
+
+#define CPSW_SL_CTL_FUNC_BASE \
+	(CPSW_SL_CTL_FULLDUPLEX |\
+	CPSW_SL_CTL_LOOPBACK |\
+	CPSW_SL_CTL_RX_FLOW_EN |\
+	CPSW_SL_CTL_TX_FLOW_EN |\
+	CPSW_SL_CTL_GMII_EN |\
+	CPSW_SL_CTL_TX_PACE |\
+	CPSW_SL_CTL_GIG |\
+	CPSW_SL_CTL_CMD_IDLE |\
+	CPSW_SL_CTL_IFCTL_A |\
+	CPSW_SL_CTL_IFCTL_B |\
+	CPSW_SL_CTL_GIG_FORCE |\
+	CPSW_SL_CTL_EXT_EN |\
+	CPSW_SL_CTL_RX_CEF_EN |\
+	CPSW_SL_CTL_RX_CSF_EN |\
+	CPSW_SL_CTL_RX_CMF_EN)
+
+struct cpsw_sl {
+	struct device *dev;
+	void __iomem *sl_base;
+	const u16 *regs;
+	u32 control_features;
+	u32 idle_mask;
+};
+
+struct cpsw_sl_dev_id {
+	const char *device_id;
+	const u16 *regs;
+	const u32 control_features;
+	const u32 regs_offset;
+	const u32 idle_mask;
+};
+
+static const struct cpsw_sl_dev_id cpsw_sl_id_match[] = {
+	{
+		.device_id = "cpsw",
+		.regs = cpsw_sl_reg_map_cpsw,
+		.control_features = CPSW_SL_CTL_FUNC_BASE |
+				    CPSW_SL_CTL_MTEST |
+				    CPSW_SL_CTL_TX_SHORT_GAP_EN |
+				    CPSW_SL_CTL_TX_SG_LIM_EN,
+		.idle_mask = CPSW_SL_STATUS_IDLE_MASK_BASE,
+	},
+	{
+		.device_id = "66ak2hk",
+		.regs = cpsw_sl_reg_map_66ak2hk,
+		.control_features = CPSW_SL_CTL_FUNC_BASE |
+				    CPSW_SL_CTL_TX_SHORT_GAP_EN,
+		.idle_mask = CPSW_SL_STATUS_IDLE_MASK_BASE,
+	},
+	{
+		.device_id = "66ak2x_xgbe",
+		.regs = cpsw_sl_reg_map_66ak2x_xgbe,
+		.control_features = CPSW_SL_CTL_FUNC_BASE |
+				    CPSW_SL_CTL_XGIG |
+				    CPSW_SL_CTL_TX_SHORT_GAP_EN |
+				    CPSW_SL_CTL_CRC_TYPE |
+				    CPSW_SL_CTL_XGMII_EN,
+		.idle_mask = CPSW_SL_STATUS_IDLE_MASK_BASE,
+	},
+	{
+		.device_id = "66ak2el",
+		.regs = cpsw_sl_reg_map_66ak2elg_am65,
+		.regs_offset = 0x330,
+		.control_features = CPSW_SL_CTL_FUNC_BASE |
+				    CPSW_SL_CTL_MTEST |
+				    CPSW_SL_CTL_TX_SHORT_GAP_EN |
+				    CPSW_SL_CTL_CRC_TYPE |
+				    CPSW_SL_CTL_EXT_EN_RX_FLO |
+				    CPSW_SL_CTL_EXT_EN_TX_FLO |
+				    CPSW_SL_CTL_TX_SG_LIM_EN,
+		.idle_mask = CPSW_SL_STATUS_IDLE_MASK_BASE,
+	},
+	{
+		.device_id = "66ak2g",
+		.regs = cpsw_sl_reg_map_66ak2elg_am65,
+		.regs_offset = 0x330,
+		.control_features = CPSW_SL_CTL_FUNC_BASE |
+				    CPSW_SL_CTL_MTEST |
+				    CPSW_SL_CTL_CRC_TYPE |
+				    CPSW_SL_CTL_EXT_EN_RX_FLO |
+				    CPSW_SL_CTL_EXT_EN_TX_FLO,
+	},
+	{
+		.device_id = "am65",
+		.regs = cpsw_sl_reg_map_66ak2elg_am65,
+		.regs_offset = 0x330,
+		.control_features = CPSW_SL_CTL_FUNC_BASE |
+				    CPSW_SL_CTL_MTEST |
+				    CPSW_SL_CTL_XGIG |
+				    CPSW_SL_CTL_TX_SHORT_GAP_EN |
+				    CPSW_SL_CTL_CRC_TYPE |
+				    CPSW_SL_CTL_XGMII_EN |
+				    CPSW_SL_CTL_EXT_EN_RX_FLO |
+				    CPSW_SL_CTL_EXT_EN_TX_FLO |
+				    CPSW_SL_CTL_TX_SG_LIM_EN |
+				    CPSW_SL_CTL_EXT_EN_XGIG,
+		.idle_mask = CPSW_SL_STATUS_IDLE_MASK_K3,
+	},
+	{ },
+};
+
+u32 cpsw_sl_reg_read(struct cpsw_sl *sl, enum cpsw_sl_regs reg)
+{
+	int val;
+
+	if (sl->regs[reg] == CPSW_SL_REG_NOTUSED) {
+		dev_err(sl->dev, "cpsw_sl: not sup r reg: %04X\n",
+			sl->regs[reg]);
+		return 0;
+	}
+
+	val = readl(sl->sl_base + sl->regs[reg]);
+	dev_dbg(sl->dev, "cpsw_sl: reg: %04X r 0x%08X\n", sl->regs[reg], val);
+	return val;
+}
+
+void cpsw_sl_reg_write(struct cpsw_sl *sl, enum cpsw_sl_regs reg, u32 val)
+{
+	if (sl->regs[reg] == CPSW_SL_REG_NOTUSED) {
+		dev_err(sl->dev, "cpsw_sl: not sup w reg: %04X\n",
+			sl->regs[reg]);
+		return;
+	}
+
+	dev_dbg(sl->dev, "cpsw_sl: reg: %04X w 0x%08X\n", sl->regs[reg], val);
+	writel(val, sl->sl_base + sl->regs[reg]);
+}
+
+static const struct cpsw_sl_dev_id *cpsw_sl_match_id(
+		const struct cpsw_sl_dev_id *id,
+		const char *device_id)
+{
+	if (!id || !device_id)
+		return NULL;
+
+	while (id->device_id) {
+		if (strcmp(device_id, id->device_id) == 0)
+			return id;
+		id++;
+	}
+	return NULL;
+}
+
+struct cpsw_sl *cpsw_sl_get(const char *device_id, struct device *dev,
+			    void __iomem *sl_base)
+{
+	const struct cpsw_sl_dev_id *sl_dev_id;
+	struct cpsw_sl *sl;
+
+	sl = devm_kzalloc(dev, sizeof(struct cpsw_sl), GFP_KERNEL);
+	if (!sl)
+		return ERR_PTR(-ENOMEM);
+	sl->dev = dev;
+	sl->sl_base = sl_base;
+
+	sl_dev_id = cpsw_sl_match_id(cpsw_sl_id_match, device_id);
+	if (!sl_dev_id) {
+		dev_err(sl->dev, "cpsw_sl: dev_id %s not found.\n", device_id);
+		return ERR_PTR(-EINVAL);
+	}
+	sl->regs = sl_dev_id->regs;
+	sl->control_features = sl_dev_id->control_features;
+	sl->idle_mask = sl_dev_id->idle_mask;
+	sl->sl_base += sl_dev_id->regs_offset;
+
+	return sl;
+}
+
+void cpsw_sl_reset(struct cpsw_sl *sl, unsigned long tmo)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(tmo);
+
+	/* Set the soft reset bit */
+	cpsw_sl_reg_write(sl, CPSW_SL_SOFT_RESET, CPSW_SL_SOFT_RESET_BIT);
+
+	/* Wait for the bit to clear */
+	do {
+		usleep_range(100, 200);
+	} while ((cpsw_sl_reg_read(sl, CPSW_SL_SOFT_RESET) &
+		  CPSW_SL_SOFT_RESET_BIT) &&
+		  time_after(timeout, jiffies));
+
+	if (cpsw_sl_reg_read(sl, CPSW_SL_SOFT_RESET) & CPSW_SL_SOFT_RESET_BIT)
+		dev_err(sl->dev, "cpsw_sl failed to soft-reset.\n");
+}
+
+u32 cpsw_sl_ctl_set(struct cpsw_sl *sl, u32 ctl_funcs)
+{
+	u32 val;
+
+	if (ctl_funcs & ~sl->control_features) {
+		dev_err(sl->dev, "cpsw_sl: unsupported func 0x%08X\n",
+			ctl_funcs & (~sl->control_features));
+		return -EINVAL;
+	}
+
+	val = cpsw_sl_reg_read(sl, CPSW_SL_MACCONTROL);
+	val |= ctl_funcs;
+	cpsw_sl_reg_write(sl, CPSW_SL_MACCONTROL, val);
+
+	return 0;
+}
+
+u32 cpsw_sl_ctl_clr(struct cpsw_sl *sl, u32 ctl_funcs)
+{
+	u32 val;
+
+	if (ctl_funcs & ~sl->control_features) {
+		dev_err(sl->dev, "cpsw_sl: unsupported func 0x%08X\n",
+			ctl_funcs & (~sl->control_features));
+		return -EINVAL;
+	}
+
+	val = cpsw_sl_reg_read(sl, CPSW_SL_MACCONTROL);
+	val &= ~ctl_funcs;
+	cpsw_sl_reg_write(sl, CPSW_SL_MACCONTROL, val);
+
+	return 0;
+}
+
+void cpsw_sl_ctl_reset(struct cpsw_sl *sl)
+{
+	cpsw_sl_reg_write(sl, CPSW_SL_MACCONTROL, 0);
+}
+
+int cpsw_sl_wait_for_idle(struct cpsw_sl *sl, unsigned long tmo)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(tmo);
+
+	do {
+		usleep_range(100, 200);
+	} while (!(cpsw_sl_reg_read(sl, CPSW_SL_MACSTATUS) &
+		  sl->idle_mask) && time_after(timeout, jiffies));
+
+	if (!(cpsw_sl_reg_read(sl, CPSW_SL_MACSTATUS) & sl->idle_mask)) {
+		dev_err(sl->dev, "cpsw_sl failed to soft-reset.\n");
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
diff --git a/drivers/net/ethernet/ti/cpsw_sl.h b/drivers/net/ethernet/ti/cpsw_sl.h
new file mode 100644
index 000000000000..a6d06a5a420f
--- /dev/null
+++ b/drivers/net/ethernet/ti/cpsw_sl.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Texas Instruments Ethernet Switch media-access-controller (MAC) submodule/
+ * Ethernet MAC Sliver (CPGMAC_SL) APIs
+ *
+ * Copyright (C) 2019 Texas Instruments
+ *
+ */
+
+#ifndef __TI_CPSW_SL_H__
+#define __TI_CPSW_SL_H__
+
+#include <linux/device.h>
+
+enum cpsw_sl_regs {
+	CPSW_SL_IDVER,
+	CPSW_SL_MACCONTROL,
+	CPSW_SL_MACSTATUS,
+	CPSW_SL_SOFT_RESET,
+	CPSW_SL_RX_MAXLEN,
+	CPSW_SL_BOFFTEST,
+	CPSW_SL_RX_PAUSE,
+	CPSW_SL_TX_PAUSE,
+	CPSW_SL_EMCONTROL,
+	CPSW_SL_RX_PRI_MAP,
+	CPSW_SL_TX_GAP,
+};
+
+enum {
+	CPSW_SL_CTL_FULLDUPLEX = BIT(0), /* Full Duplex mode */
+	CPSW_SL_CTL_LOOPBACK = BIT(1), /* Loop Back Mode */
+	CPSW_SL_CTL_MTEST = BIT(2), /* Manufacturing Test mode */
+	CPSW_SL_CTL_RX_FLOW_EN = BIT(3), /* Receive Flow Control Enable */
+	CPSW_SL_CTL_TX_FLOW_EN = BIT(4), /* Transmit Flow Control Enable */
+	CPSW_SL_CTL_GMII_EN = BIT(5), /* GMII Enable */
+	CPSW_SL_CTL_TX_PACE = BIT(6), /* Transmit Pacing Enable */
+	CPSW_SL_CTL_GIG = BIT(7), /* Gigabit Mode */
+	CPSW_SL_CTL_XGIG = BIT(8), /* 10 Gigabit Mode */
+	CPSW_SL_CTL_TX_SHORT_GAP_EN = BIT(10), /* Transmit Short Gap Enable */
+	CPSW_SL_CTL_CMD_IDLE = BIT(11), /* Command Idle */
+	CPSW_SL_CTL_CRC_TYPE = BIT(12), /* Port CRC Type */
+	CPSW_SL_CTL_XGMII_EN = BIT(13), /* XGMII Enable */
+	CPSW_SL_CTL_IFCTL_A = BIT(15), /* Interface Control A */
+	CPSW_SL_CTL_IFCTL_B = BIT(16), /* Interface Control B */
+	CPSW_SL_CTL_GIG_FORCE = BIT(17), /* Gigabit Mode Force */
+	CPSW_SL_CTL_EXT_EN = BIT(18), /* External Control Enable */
+	CPSW_SL_CTL_EXT_EN_RX_FLO = BIT(19), /* Ext RX Flow Control Enable */
+	CPSW_SL_CTL_EXT_EN_TX_FLO = BIT(20), /* Ext TX Flow Control Enable */
+	CPSW_SL_CTL_TX_SG_LIM_EN = BIT(21), /* TXt Short Gap Limit Enable */
+	CPSW_SL_CTL_RX_CEF_EN = BIT(22), /* RX Copy Error Frames Enable */
+	CPSW_SL_CTL_RX_CSF_EN = BIT(23), /* RX Copy Short Frames Enable */
+	CPSW_SL_CTL_RX_CMF_EN = BIT(24), /* RX Copy MAC Control Frames Enable */
+	CPSW_SL_CTL_EXT_EN_XGIG = BIT(25),  /* Ext XGIG Control En, k3 only */
+
+	CPSW_SL_CTL_FUNCS_COUNT
+};
+
+struct cpsw_sl;
+
+struct cpsw_sl *cpsw_sl_get(const char *device_id, struct device *dev,
+			    void __iomem *sl_base);
+
+void cpsw_sl_reset(struct cpsw_sl *sl, unsigned long tmo);
+
+u32 cpsw_sl_ctl_set(struct cpsw_sl *sl, u32 ctl_funcs);
+u32 cpsw_sl_ctl_clr(struct cpsw_sl *sl, u32 ctl_funcs);
+void cpsw_sl_ctl_reset(struct cpsw_sl *sl);
+int cpsw_sl_wait_for_idle(struct cpsw_sl *sl, unsigned long tmo);
+
+u32 cpsw_sl_reg_read(struct cpsw_sl *sl, enum cpsw_sl_regs reg);
+void cpsw_sl_reg_write(struct cpsw_sl *sl, enum cpsw_sl_regs reg, u32 val);
+
+#endif /* __TI_CPSW_SL_H__ */