u-boot/drivers/phy/ti-pipe3-phy.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

372 lines
9.2 KiB
C

// 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 */
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)) {
pr_err("%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) {
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);
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;
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),
};