drivers: phy: add PIPE3 phy driver

This phy is found on omap platforms with sata capabilities.
Except for the part related to the DM and the PHY framework, the code is
basically a copy paste from arch/arm/mach-omap2/pipe3-phy.c

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

3 files changed, 392 insertions, 0 deletions

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 75f459d..a91a694 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -41,4 +41,22 @@ config PHY_SANDBOX
 	  This select a dummy sandbox PHY driver. It used only to implement
 	  the unit tests for the phy framework
 
+config PIPE3_PHY
+	bool "Support omap's PIPE3 PHY"
+	depends on PHY && ARCH_OMAP2
+	help
+	  Support for the omap PIPE3 phy for sata
+
+	  This PHY is found on omap devices supporting SATA such as dra7, am57x
+	  and omap5
+
+config SPL_PIPE3_PHY
+	bool "Support omap's PIPE3 PHY in SPL"
+	depends on SPL_PHY && ARCH_OMAP2
+	help
+	  Support for the omap PIPE3 phy for sata in SPL
+
+	  This PHY is found on omap devices supporting SATA such as dra7, am57x
+	  and omap5
+
 endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index fd037c3..6ce96d2 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -7,3 +7,4 @@
 
 obj-$(CONFIG_$(SPL_)PHY) += phy-uclass.o
 obj-$(CONFIG_PHY_SANDBOX) += sandbox-phy.o
+obj-$(CONFIG_$(SPL_)PIPE3_PHY) += ti-pipe3-phy.o
diff --git a/drivers/phy/ti-pipe3-phy.c b/drivers/phy/ti-pipe3-phy.c
new file mode 100644
index 0000000..ed80f0f
--- /dev/null
+++ b/drivers/phy/ti-pipe3-phy.c
@@ -0,0 +1,373 @@
+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device.h>
+#include <generic-phy.h>
+#include <asm/io.h>
+#include <asm/arch/sys_proto.h>
+#include <syscon.h>
+#include <regmap.h>
+
+/* PLLCTRL Registers */
+#define PLL_STATUS              0x00000004
+#define PLL_GO                  0x00000008
+#define PLL_CONFIGURATION1      0x0000000C
+#define PLL_CONFIGURATION2      0x00000010
+#define PLL_CONFIGURATION3      0x00000014
+#define PLL_CONFIGURATION4      0x00000020
+
+#define PLL_REGM_MASK           0x001FFE00
+#define PLL_REGM_SHIFT          9
+#define PLL_REGM_F_MASK         0x0003FFFF
+#define PLL_REGM_F_SHIFT        0
+#define PLL_REGN_MASK           0x000001FE
+#define PLL_REGN_SHIFT          1
+#define PLL_SELFREQDCO_MASK     0x0000000E
+#define PLL_SELFREQDCO_SHIFT    1
+#define PLL_SD_MASK             0x0003FC00
+#define PLL_SD_SHIFT            10
+#define SET_PLL_GO              0x1
+#define PLL_TICOPWDN            BIT(16)
+#define PLL_LDOPWDN             BIT(15)
+#define PLL_LOCK                0x2
+#define PLL_IDLE                0x1
+
+/* Software rest for the SATA PLL (in CTRL_CORE_SMA_SW_0 register)*/
+#define SATA_PLL_SOFT_RESET (1<<18)
+
+/* PHY POWER CONTROL Register */
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK         0x003FC000
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT        0xE
+
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK        0xFFC00000
+#define OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT       0x16
+
+#define OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON       0x3
+#define OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF      0x0
+
+
+#define PLL_IDLE_TIME   100     /* in milliseconds */
+#define PLL_LOCK_TIME   100     /* in milliseconds */
+
+struct omap_pipe3 {
+	void __iomem		*pll_ctrl_base;
+	void __iomem		*power_reg;
+	void __iomem		*pll_reset_reg;
+	struct pipe3_dpll_map	*dpll_map;
+};
+
+
+struct pipe3_dpll_params {
+	u16     m;
+	u8      n;
+	u8      freq:3;
+	u8      sd;
+	u32     mf;
+};
+
+struct pipe3_dpll_map {
+	unsigned long rate;
+	struct pipe3_dpll_params params;
+};
+
+static inline u32 omap_pipe3_readl(void __iomem *addr, unsigned offset)
+{
+	return readl(addr + offset);
+}
+
+static inline void omap_pipe3_writel(void __iomem *addr, unsigned offset,
+		u32 data)
+{
+	writel(data, addr + offset);
+}
+
+static struct pipe3_dpll_params *omap_pipe3_get_dpll_params(struct omap_pipe3
+									*pipe3)
+{
+	u32 rate;
+	struct pipe3_dpll_map *dpll_map = pipe3->dpll_map;
+
+	rate = get_sys_clk_freq();
+
+	for (; dpll_map->rate; dpll_map++) {
+		if (rate == dpll_map->rate)
+			return &dpll_map->params;
+	}
+
+	printf("%s: No DPLL configuration for %u Hz SYS CLK\n",
+	       __func__, rate);
+	return NULL;
+}
+
+static int omap_pipe3_wait_lock(struct omap_pipe3 *pipe3)
+{
+	u32 val;
+	int timeout = PLL_LOCK_TIME;
+
+	do {
+		mdelay(1);
+		val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_STATUS);
+		if (val & PLL_LOCK)
+			break;
+	} while (--timeout);
+
+	if (!(val & PLL_LOCK)) {
+		printf("%s: DPLL failed to lock\n", __func__);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int omap_pipe3_dpll_program(struct omap_pipe3 *pipe3)
+{
+	u32                     val;
+	struct pipe3_dpll_params *dpll_params;
+
+	dpll_params = omap_pipe3_get_dpll_params(pipe3);
+	if (!dpll_params) {
+		printf("%s: Invalid DPLL parameters\n", __func__);
+		return -EINVAL;
+	}
+
+	val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_CONFIGURATION1);
+	val &= ~PLL_REGN_MASK;
+	val |= dpll_params->n << PLL_REGN_SHIFT;
+	omap_pipe3_writel(pipe3->pll_ctrl_base, PLL_CONFIGURATION1, val);
+
+	val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_CONFIGURATION2);
+	val &= ~PLL_SELFREQDCO_MASK;
+	val |= dpll_params->freq << PLL_SELFREQDCO_SHIFT;
+	omap_pipe3_writel(pipe3->pll_ctrl_base, PLL_CONFIGURATION2, val);
+
+	val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_CONFIGURATION1);
+	val &= ~PLL_REGM_MASK;
+	val |= dpll_params->m << PLL_REGM_SHIFT;
+	omap_pipe3_writel(pipe3->pll_ctrl_base, PLL_CONFIGURATION1, val);
+
+	val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_CONFIGURATION4);
+	val &= ~PLL_REGM_F_MASK;
+	val |= dpll_params->mf << PLL_REGM_F_SHIFT;
+	omap_pipe3_writel(pipe3->pll_ctrl_base, PLL_CONFIGURATION4, val);
+
+	val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_CONFIGURATION3);
+	val &= ~PLL_SD_MASK;
+	val |= dpll_params->sd << PLL_SD_SHIFT;
+	omap_pipe3_writel(pipe3->pll_ctrl_base, PLL_CONFIGURATION3, val);
+
+	omap_pipe3_writel(pipe3->pll_ctrl_base, PLL_GO, SET_PLL_GO);
+
+	return omap_pipe3_wait_lock(pipe3);
+}
+
+static void omap_control_pipe3_power(struct omap_pipe3 *pipe3, int on)
+{
+	u32 val, rate;
+
+	val = readl(pipe3->power_reg);
+
+	rate = get_sys_clk_freq();
+	rate = rate/1000000;
+
+	if (on) {
+		val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
+				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK);
+		val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON <<
+			OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+		val |= rate <<
+			OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
+	} else {
+		val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
+		val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF <<
+			OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+	}
+
+	writel(val, pipe3->power_reg);
+}
+
+static int pipe3_init(struct phy *phy)
+{
+	int ret;
+	u32 val;
+	struct omap_pipe3 *pipe3 = dev_get_priv(phy->dev);
+
+	/* Program the DPLL only if not locked */
+	val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_STATUS);
+	if (!(val & PLL_LOCK)) {
+		ret = omap_pipe3_dpll_program(pipe3);
+		if (ret)
+			return ret;
+	} else {
+		/* else just bring it out of IDLE mode */
+		val = omap_pipe3_readl(pipe3->pll_ctrl_base,
+				       PLL_CONFIGURATION2);
+		if (val & PLL_IDLE) {
+			val &= ~PLL_IDLE;
+			omap_pipe3_writel(pipe3->pll_ctrl_base,
+					  PLL_CONFIGURATION2, val);
+			ret = omap_pipe3_wait_lock(pipe3);
+			if (ret)
+				return ret;
+		}
+	}
+	return 0;
+}
+
+static int pipe3_power_on(struct phy *phy)
+{
+	struct omap_pipe3 *pipe3 = dev_get_priv(phy->dev);
+
+	/* Power up the PHY */
+	omap_control_pipe3_power(pipe3, 1);
+
+	return 0;
+}
+
+static int pipe3_power_off(struct phy *phy)
+{
+	struct omap_pipe3 *pipe3 = dev_get_priv(phy->dev);
+
+	/* Power down the PHY */
+	omap_control_pipe3_power(pipe3, 0);
+
+	return 0;
+}
+
+static int pipe3_exit(struct phy *phy)
+{
+	u32 val;
+	int timeout = PLL_IDLE_TIME;
+	struct omap_pipe3 *pipe3 = dev_get_priv(phy->dev);
+
+	pipe3_power_off(phy);
+
+	/* Put DPLL in IDLE mode */
+	val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_CONFIGURATION2);
+	val |= PLL_IDLE;
+	omap_pipe3_writel(pipe3->pll_ctrl_base, PLL_CONFIGURATION2, val);
+
+	/* wait for LDO and Oscillator to power down */
+	do {
+		mdelay(1);
+		val = omap_pipe3_readl(pipe3->pll_ctrl_base, PLL_STATUS);
+		if ((val & PLL_TICOPWDN) && (val & PLL_LDOPWDN))
+			break;
+	} while (--timeout);
+
+	if (!(val & PLL_TICOPWDN) || !(val & PLL_LDOPWDN)) {
+		error("%s: Failed to power down DPLL: PLL_STATUS 0x%x\n",
+		      __func__, val);
+		return -EBUSY;
+	}
+
+	val = readl(pipe3->pll_reset_reg);
+	writel(val | SATA_PLL_SOFT_RESET, pipe3->pll_reset_reg);
+	mdelay(1);
+	writel(val & ~SATA_PLL_SOFT_RESET, pipe3->pll_reset_reg);
+	return 0;
+}
+
+static void *get_reg(struct udevice *dev, const char *name)
+{
+	struct udevice *syscon;
+	struct regmap *regmap;
+	const fdt32_t *cell;
+	int len, err;
+	void *base;
+
+	err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
+					   name, &syscon);
+	if (err) {
+		error("unable to find syscon device for %s (%d)\n",
+		      name, err);
+		return NULL;
+	}
+
+	regmap = syscon_get_regmap(syscon);
+	if (IS_ERR(regmap)) {
+		error("unable to find regmap for %s (%ld)\n",
+		      name, PTR_ERR(regmap));
+		return NULL;
+	}
+
+	cell = fdt_getprop(gd->fdt_blob, dev->of_offset, name,
+			   &len);
+	if (len < 2*sizeof(fdt32_t)) {
+		error("offset not available for %s\n", name);
+		return NULL;
+	}
+
+	base = regmap_get_range(regmap, 0);
+	if (!base)
+		return NULL;
+
+	return fdtdec_get_number(cell + 1, 1) + base;
+}
+
+static int pipe3_phy_probe(struct udevice *dev)
+{
+	fdt_addr_t addr;
+	fdt_size_t sz;
+	struct omap_pipe3 *pipe3 = dev_get_priv(dev);
+
+	addr = dev_get_addr_size_index(dev, 2, &sz);
+	if (addr == FDT_ADDR_T_NONE) {
+		error("missing pll ctrl address\n");
+		return -EINVAL;
+	}
+
+	pipe3->pll_ctrl_base = map_physmem(addr, sz, MAP_NOCACHE);
+	if (!pipe3->pll_ctrl_base) {
+		error("unable to remap pll ctrl\n");
+		return -EINVAL;
+	}
+
+	pipe3->power_reg = get_reg(dev, "syscon-phy-power");
+	if (!pipe3->power_reg)
+		return -EINVAL;
+
+	pipe3->pll_reset_reg = get_reg(dev, "syscon-pllreset");
+	if (!pipe3->pll_reset_reg)
+		return -EINVAL;
+
+	pipe3->dpll_map = (struct pipe3_dpll_map *)dev_get_driver_data(dev);
+
+	return 0;
+}
+
+static struct pipe3_dpll_map dpll_map_sata[] = {
+	{12000000, {1000, 7, 4, 6, 0} },        /* 12 MHz */
+	{16800000, {714, 7, 4, 6, 0} },         /* 16.8 MHz */
+	{19200000, {625, 7, 4, 6, 0} },         /* 19.2 MHz */
+	{20000000, {600, 7, 4, 6, 0} },         /* 20 MHz */
+	{26000000, {461, 7, 4, 6, 0} },         /* 26 MHz */
+	{38400000, {312, 7, 4, 6, 0} },         /* 38.4 MHz */
+	{ },                                    /* Terminator */
+};
+
+static const struct udevice_id pipe3_phy_ids[] = {
+	{ .compatible = "ti,phy-pipe3-sata", .data = (ulong)&dpll_map_sata },
+	{ }
+};
+
+static struct phy_ops pipe3_phy_ops = {
+	.init = pipe3_init,
+	.power_on = pipe3_power_on,
+	.power_off = pipe3_power_off,
+	.exit = pipe3_exit,
+};
+
+U_BOOT_DRIVER(pipe3_phy) = {
+	.name	= "pipe3_phy",
+	.id	= UCLASS_PHY,
+	.of_match = pipe3_phy_ids,
+	.ops = &pipe3_phy_ops,
+	.probe = pipe3_phy_probe,
+	.priv_auto_alloc_size = sizeof(struct omap_pipe3),
+};