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// SPDX-License-Identifier: GPL-2.0-only
/*
* Samsung SoC USB 1.1/2.0 PHY driver - Exynos 4x12 support
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Author: Kamil Debski <k.debski@samsung.com>
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include "phy-samsung-usb2.h"
/* Exynos USB PHY registers */
/* PHY power control */
#define EXYNOS_4x12_UPHYPWR 0x0
#define EXYNOS_4x12_UPHYPWR_PHY0_SUSPEND BIT(0)
#define EXYNOS_4x12_UPHYPWR_PHY0_PWR BIT(3)
#define EXYNOS_4x12_UPHYPWR_PHY0_OTG_PWR BIT(4)
#define EXYNOS_4x12_UPHYPWR_PHY0_SLEEP BIT(5)
#define EXYNOS_4x12_UPHYPWR_PHY0 ( \
EXYNOS_4x12_UPHYPWR_PHY0_SUSPEND | \
EXYNOS_4x12_UPHYPWR_PHY0_PWR | \
EXYNOS_4x12_UPHYPWR_PHY0_OTG_PWR | \
EXYNOS_4x12_UPHYPWR_PHY0_SLEEP)
#define EXYNOS_4x12_UPHYPWR_PHY1_SUSPEND BIT(6)
#define EXYNOS_4x12_UPHYPWR_PHY1_PWR BIT(7)
#define EXYNOS_4x12_UPHYPWR_PHY1_SLEEP BIT(8)
#define EXYNOS_4x12_UPHYPWR_PHY1 ( \
EXYNOS_4x12_UPHYPWR_PHY1_SUSPEND | \
EXYNOS_4x12_UPHYPWR_PHY1_PWR | \
EXYNOS_4x12_UPHYPWR_PHY1_SLEEP)
#define EXYNOS_4x12_UPHYPWR_HSIC0_SUSPEND BIT(9)
#define EXYNOS_4x12_UPHYPWR_HSIC0_PWR BIT(10)
#define EXYNOS_4x12_UPHYPWR_HSIC0_SLEEP BIT(11)
#define EXYNOS_4x12_UPHYPWR_HSIC0 ( \
EXYNOS_4x12_UPHYPWR_HSIC0_SUSPEND | \
EXYNOS_4x12_UPHYPWR_HSIC0_PWR | \
EXYNOS_4x12_UPHYPWR_HSIC0_SLEEP)
#define EXYNOS_4x12_UPHYPWR_HSIC1_SUSPEND BIT(12)
#define EXYNOS_4x12_UPHYPWR_HSIC1_PWR BIT(13)
#define EXYNOS_4x12_UPHYPWR_HSIC1_SLEEP BIT(14)
#define EXYNOS_4x12_UPHYPWR_HSIC1 ( \
EXYNOS_4x12_UPHYPWR_HSIC1_SUSPEND | \
EXYNOS_4x12_UPHYPWR_HSIC1_PWR | \
EXYNOS_4x12_UPHYPWR_HSIC1_SLEEP)
/* PHY clock control */
#define EXYNOS_4x12_UPHYCLK 0x4
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_MASK (0x7 << 0)
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_OFFSET 0
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_9MHZ6 (0x0 << 0)
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_10MHZ (0x1 << 0)
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_12MHZ (0x2 << 0)
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_19MHZ2 (0x3 << 0)
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_20MHZ (0x4 << 0)
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_24MHZ (0x5 << 0)
#define EXYNOS_4x12_UPHYCLK_PHYFSEL_50MHZ (0x7 << 0)
#define EXYNOS_3250_UPHYCLK_REFCLKSEL (0x2 << 8)
#define EXYNOS_4x12_UPHYCLK_PHY0_ID_PULLUP BIT(3)
#define EXYNOS_4x12_UPHYCLK_PHY0_COMMON_ON BIT(4)
#define EXYNOS_4x12_UPHYCLK_PHY1_COMMON_ON BIT(7)
#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_MASK (0x7f << 10)
#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_OFFSET 10
#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_12MHZ (0x24 << 10)
#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_15MHZ (0x1c << 10)
#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_16MHZ (0x1a << 10)
#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_19MHZ2 (0x15 << 10)
#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_20MHZ (0x14 << 10)
/* PHY reset control */
#define EXYNOS_4x12_UPHYRST 0x8
#define EXYNOS_4x12_URSTCON_PHY0 BIT(0)
#define EXYNOS_4x12_URSTCON_OTG_HLINK BIT(1)
#define EXYNOS_4x12_URSTCON_OTG_PHYLINK BIT(2)
#define EXYNOS_4x12_URSTCON_HOST_PHY BIT(3)
/* The following bit defines are presented in the
* order taken from the Exynos4412 reference manual.
*
* During experiments with the hardware and debugging
* it was determined that the hardware behaves contrary
* to the manual.
*
* The following bit values were chaned accordingly to the
* results of real hardware experiments.
*/
#define EXYNOS_4x12_URSTCON_PHY1 BIT(4)
#define EXYNOS_4x12_URSTCON_HSIC0 BIT(6)
#define EXYNOS_4x12_URSTCON_HSIC1 BIT(5)
#define EXYNOS_4x12_URSTCON_HOST_LINK_ALL BIT(7)
#define EXYNOS_4x12_URSTCON_HOST_LINK_P0 BIT(10)
#define EXYNOS_4x12_URSTCON_HOST_LINK_P1 BIT(9)
#define EXYNOS_4x12_URSTCON_HOST_LINK_P2 BIT(8)
/* Isolation, configured in the power management unit */
#define EXYNOS_4x12_USB_ISOL_OFFSET 0x704
#define EXYNOS_4x12_USB_ISOL_OTG BIT(0)
#define EXYNOS_4x12_USB_ISOL_HSIC0_OFFSET 0x708
#define EXYNOS_4x12_USB_ISOL_HSIC0 BIT(0)
#define EXYNOS_4x12_USB_ISOL_HSIC1_OFFSET 0x70c
#define EXYNOS_4x12_USB_ISOL_HSIC1 BIT(0)
/* Mode switching SUB Device <-> Host */
#define EXYNOS_4x12_MODE_SWITCH_OFFSET 0x21c
#define EXYNOS_4x12_MODE_SWITCH_MASK 1
#define EXYNOS_4x12_MODE_SWITCH_DEVICE 0
#define EXYNOS_4x12_MODE_SWITCH_HOST 1
enum exynos4x12_phy_id {
EXYNOS4x12_DEVICE,
EXYNOS4x12_HOST,
EXYNOS4x12_HSIC0,
EXYNOS4x12_HSIC1,
EXYNOS4x12_NUM_PHYS,
};
/*
* exynos4x12_rate_to_clk() converts the supplied clock rate to the value that
* can be written to the phy register.
*/
static int exynos4x12_rate_to_clk(unsigned long rate, u32 *reg)
{
/* EXYNOS_4x12_UPHYCLK_PHYFSEL_MASK */
switch (rate) {
case 9600 * KHZ:
*reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_9MHZ6;
break;
case 10 * MHZ:
*reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_10MHZ;
break;
case 12 * MHZ:
*reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_12MHZ;
break;
case 19200 * KHZ:
*reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_19MHZ2;
break;
case 20 * MHZ:
*reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_20MHZ;
break;
case 24 * MHZ:
*reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_24MHZ;
break;
case 50 * MHZ:
*reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_50MHZ;
break;
default:
return -EINVAL;
}
return 0;
}
static void exynos4x12_isol(struct samsung_usb2_phy_instance *inst, bool on)
{
struct samsung_usb2_phy_driver *drv = inst->drv;
u32 offset;
u32 mask;
switch (inst->cfg->id) {
case EXYNOS4x12_DEVICE:
case EXYNOS4x12_HOST:
offset = EXYNOS_4x12_USB_ISOL_OFFSET;
mask = EXYNOS_4x12_USB_ISOL_OTG;
break;
case EXYNOS4x12_HSIC0:
offset = EXYNOS_4x12_USB_ISOL_HSIC0_OFFSET;
mask = EXYNOS_4x12_USB_ISOL_HSIC0;
break;
case EXYNOS4x12_HSIC1:
offset = EXYNOS_4x12_USB_ISOL_HSIC1_OFFSET;
mask = EXYNOS_4x12_USB_ISOL_HSIC1;
break;
default:
return;
}
regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 : mask);
}
static void exynos4x12_setup_clk(struct samsung_usb2_phy_instance *inst)
{
struct samsung_usb2_phy_driver *drv = inst->drv;
u32 clk;
clk = readl(drv->reg_phy + EXYNOS_4x12_UPHYCLK);
clk &= ~EXYNOS_4x12_UPHYCLK_PHYFSEL_MASK;
if (drv->cfg->has_refclk_sel)
clk = EXYNOS_3250_UPHYCLK_REFCLKSEL;
clk |= drv->ref_reg_val << EXYNOS_4x12_UPHYCLK_PHYFSEL_OFFSET;
clk |= EXYNOS_4x12_UPHYCLK_PHY1_COMMON_ON;
writel(clk, drv->reg_phy + EXYNOS_4x12_UPHYCLK);
}
static void exynos4x12_phy_pwr(struct samsung_usb2_phy_instance *inst, bool on)
{
struct samsung_usb2_phy_driver *drv = inst->drv;
u32 rstbits = 0;
u32 phypwr = 0;
u32 rst;
u32 pwr;
switch (inst->cfg->id) {
case EXYNOS4x12_DEVICE:
phypwr = EXYNOS_4x12_UPHYPWR_PHY0;
rstbits = EXYNOS_4x12_URSTCON_PHY0;
break;
case EXYNOS4x12_HOST:
phypwr = EXYNOS_4x12_UPHYPWR_PHY1;
rstbits = EXYNOS_4x12_URSTCON_HOST_PHY |
EXYNOS_4x12_URSTCON_PHY1 |
EXYNOS_4x12_URSTCON_HOST_LINK_P0;
break;
case EXYNOS4x12_HSIC0:
phypwr = EXYNOS_4x12_UPHYPWR_HSIC0;
rstbits = EXYNOS_4x12_URSTCON_HSIC0 |
EXYNOS_4x12_URSTCON_HOST_LINK_P1;
break;
case EXYNOS4x12_HSIC1:
phypwr = EXYNOS_4x12_UPHYPWR_HSIC1;
rstbits = EXYNOS_4x12_URSTCON_HSIC1 |
EXYNOS_4x12_URSTCON_HOST_LINK_P1;
break;
}
if (on) {
pwr = readl(drv->reg_phy + EXYNOS_4x12_UPHYPWR);
pwr &= ~phypwr;
writel(pwr, drv->reg_phy + EXYNOS_4x12_UPHYPWR);
rst = readl(drv->reg_phy + EXYNOS_4x12_UPHYRST);
rst |= rstbits;
writel(rst, drv->reg_phy + EXYNOS_4x12_UPHYRST);
udelay(10);
rst &= ~rstbits;
writel(rst, drv->reg_phy + EXYNOS_4x12_UPHYRST);
/* The following delay is necessary for the reset sequence to be
* completed */
udelay(80);
} else {
pwr = readl(drv->reg_phy + EXYNOS_4x12_UPHYPWR);
pwr |= phypwr;
writel(pwr, drv->reg_phy + EXYNOS_4x12_UPHYPWR);
}
}
static void exynos4x12_power_on_int(struct samsung_usb2_phy_instance *inst)
{
if (inst->int_cnt++ > 0)
return;
exynos4x12_setup_clk(inst);
exynos4x12_isol(inst, 0);
exynos4x12_phy_pwr(inst, 1);
}
static int exynos4x12_power_on(struct samsung_usb2_phy_instance *inst)
{
struct samsung_usb2_phy_driver *drv = inst->drv;
if (inst->ext_cnt++ > 0)
return 0;
if (inst->cfg->id == EXYNOS4x12_HOST) {
regmap_update_bits(drv->reg_sys, EXYNOS_4x12_MODE_SWITCH_OFFSET,
EXYNOS_4x12_MODE_SWITCH_MASK,
EXYNOS_4x12_MODE_SWITCH_HOST);
exynos4x12_power_on_int(&drv->instances[EXYNOS4x12_DEVICE]);
}
if (inst->cfg->id == EXYNOS4x12_DEVICE && drv->cfg->has_mode_switch)
regmap_update_bits(drv->reg_sys, EXYNOS_4x12_MODE_SWITCH_OFFSET,
EXYNOS_4x12_MODE_SWITCH_MASK,
EXYNOS_4x12_MODE_SWITCH_DEVICE);
if (inst->cfg->id == EXYNOS4x12_HSIC0 ||
inst->cfg->id == EXYNOS4x12_HSIC1) {
exynos4x12_power_on_int(&drv->instances[EXYNOS4x12_DEVICE]);
exynos4x12_power_on_int(&drv->instances[EXYNOS4x12_HOST]);
}
exynos4x12_power_on_int(inst);
return 0;
}
static void exynos4x12_power_off_int(struct samsung_usb2_phy_instance *inst)
{
if (inst->int_cnt-- > 1)
return;
exynos4x12_isol(inst, 1);
exynos4x12_phy_pwr(inst, 0);
}
static int exynos4x12_power_off(struct samsung_usb2_phy_instance *inst)
{
struct samsung_usb2_phy_driver *drv = inst->drv;
if (inst->ext_cnt-- > 1)
return 0;
if (inst->cfg->id == EXYNOS4x12_DEVICE && drv->cfg->has_mode_switch)
regmap_update_bits(drv->reg_sys, EXYNOS_4x12_MODE_SWITCH_OFFSET,
EXYNOS_4x12_MODE_SWITCH_MASK,
EXYNOS_4x12_MODE_SWITCH_HOST);
if (inst->cfg->id == EXYNOS4x12_HOST)
exynos4x12_power_off_int(&drv->instances[EXYNOS4x12_DEVICE]);
if (inst->cfg->id == EXYNOS4x12_HSIC0 ||
inst->cfg->id == EXYNOS4x12_HSIC1) {
exynos4x12_power_off_int(&drv->instances[EXYNOS4x12_DEVICE]);
exynos4x12_power_off_int(&drv->instances[EXYNOS4x12_HOST]);
}
exynos4x12_power_off_int(inst);
return 0;
}
static const struct samsung_usb2_common_phy exynos4x12_phys[] = {
{
.label = "device",
.id = EXYNOS4x12_DEVICE,
.power_on = exynos4x12_power_on,
.power_off = exynos4x12_power_off,
},
{
.label = "host",
.id = EXYNOS4x12_HOST,
.power_on = exynos4x12_power_on,
.power_off = exynos4x12_power_off,
},
{
.label = "hsic0",
.id = EXYNOS4x12_HSIC0,
.power_on = exynos4x12_power_on,
.power_off = exynos4x12_power_off,
},
{
.label = "hsic1",
.id = EXYNOS4x12_HSIC1,
.power_on = exynos4x12_power_on,
.power_off = exynos4x12_power_off,
},
};
const struct samsung_usb2_phy_config exynos3250_usb2_phy_config = {
.has_refclk_sel = 1,
.num_phys = 1,
.phys = exynos4x12_phys,
.rate_to_clk = exynos4x12_rate_to_clk,
};
const struct samsung_usb2_phy_config exynos4x12_usb2_phy_config = {
.has_mode_switch = 1,
.num_phys = EXYNOS4x12_NUM_PHYS,
.phys = exynos4x12_phys,
.rate_to_clk = exynos4x12_rate_to_clk,
};