drivers/phy/ti-pipe3-phy.c - platform/external/u-boot - Gitiles

 /*
  * 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),
 };
	/*
	* 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),
	};