u-boot/drivers/phy/ti-pipe3-phy.c

411 lines
10 KiB
C
Raw Normal View History

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
* Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
*/
#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 */
enum pipe3_mode { PIPE3_MODE_PCIE = 1,
PIPE3_MODE_SATA,
PIPE3_MODE_USBSS };
struct omap_pipe3 {
void __iomem *pll_ctrl_base;
void __iomem *power_reg;
void __iomem *pll_reset_reg;
struct pipe3_dpll_map *dpll_map;
enum pipe3_mode mode;
};
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;
};
struct pipe3_data {
enum pipe3_mode mode;
struct pipe3_dpll_map *dpll_map;
};
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 | PLL_IDLE);
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)) {
pr_err("%s: Failed to power down DPLL: PLL_STATUS 0x%x\n",
__func__, val);
return -EBUSY;
}
if (pipe3->pll_reset_reg) {
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) {
pr_err("unable to find syscon device for %s (%d)\n",
name, err);
return NULL;
}
regmap = syscon_get_regmap(syscon);
if (IS_ERR(regmap)) {
pr_err("unable to find regmap for %s (%ld)\n",
name, PTR_ERR(regmap));
return NULL;
}
cell = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), name,
&len);
if (len < 2*sizeof(fdt32_t)) {
pr_err("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);
struct pipe3_data *data;
addr = devfdt_get_addr_size_index(dev, 2, &sz);
if (addr == FDT_ADDR_T_NONE) {
pr_err("missing pll ctrl address\n");
return -EINVAL;
}
pipe3->pll_ctrl_base = map_physmem(addr, sz, MAP_NOCACHE);
if (!pipe3->pll_ctrl_base) {
pr_err("unable to remap pll ctrl\n");
return -EINVAL;
}
pipe3->power_reg = get_reg(dev, "syscon-phy-power");
if (!pipe3->power_reg)
return -EINVAL;
data = (struct pipe3_data *)dev_get_driver_data(dev);
pipe3->mode = data->mode;
pipe3->dpll_map = data->dpll_map;
if (pipe3->mode == PIPE3_MODE_SATA) {
pipe3->pll_reset_reg = get_reg(dev, "syscon-pllreset");
if (!pipe3->pll_reset_reg)
return -EINVAL;
}
return 0;
}
static struct pipe3_dpll_map dpll_map_sata[] = {
{12000000, {625, 4, 4, 6, 0} }, /* 12 MHz */
{16800000, {625, 6, 4, 7, 0} }, /* 16.8 MHz */
{19200000, {625, 7, 4, 6, 0} }, /* 19.2 MHz */
{20000000, {750, 9, 4, 6, 0} }, /* 20 MHz */
{26000000, {750, 12, 4, 6, 0} }, /* 26 MHz */
{38400000, {625, 15, 4, 6, 0} }, /* 38.4 MHz */
{ }, /* Terminator */
};
static struct pipe3_dpll_map dpll_map_usb[] = {
{12000000, {1250, 5, 4, 20, 0} }, /* 12 MHz */
{16800000, {3125, 20, 4, 20, 0} }, /* 16.8 MHz */
{19200000, {1172, 8, 4, 20, 65537} }, /* 19.2 MHz */
{20000000, {1000, 7, 4, 10, 0} }, /* 20 MHz */
{26000000, {1250, 12, 4, 20, 0} }, /* 26 MHz */
{38400000, {3125, 47, 4, 20, 92843} }, /* 38.4 MHz */
{ }, /* Terminator */
};
static struct pipe3_data data_usb = {
.mode = PIPE3_MODE_USBSS,
.dpll_map = dpll_map_usb,
};
static struct pipe3_data data_sata = {
.mode = PIPE3_MODE_SATA,
.dpll_map = dpll_map_sata,
};
static const struct udevice_id pipe3_phy_ids[] = {
{ .compatible = "ti,phy-pipe3-sata", .data = (ulong)&data_sata },
{ .compatible = "ti,omap-usb3", .data = (ulong)&data_usb},
{ }
};
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),
};