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phy-exynos4210-usb2.c
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/*
* Samsung SoC USB 1.1/2.0 PHY driver - Exynos 4210 support
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Author: Kamil Debski <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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_4210_UPHYPWR 0x0
#define EXYNOS_4210_UPHYPWR_PHY0_SUSPEND BIT(0)
#define EXYNOS_4210_UPHYPWR_PHY0_PWR BIT(3)
#define EXYNOS_4210_UPHYPWR_PHY0_OTG_PWR BIT(4)
#define EXYNOS_4210_UPHYPWR_PHY0_SLEEP BIT(5)
#define EXYNOS_4210_UPHYPWR_PHY0 ( \
EXYNOS_4210_UPHYPWR_PHY0_SUSPEND | \
EXYNOS_4210_UPHYPWR_PHY0_PWR | \
EXYNOS_4210_UPHYPWR_PHY0_OTG_PWR | \
EXYNOS_4210_UPHYPWR_PHY0_SLEEP)
#define EXYNOS_4210_UPHYPWR_PHY1_SUSPEND BIT(6)
#define EXYNOS_4210_UPHYPWR_PHY1_PWR BIT(7)
#define EXYNOS_4210_UPHYPWR_PHY1_SLEEP BIT(8)
#define EXYNOS_4210_UPHYPWR_PHY1 ( \
EXYNOS_4210_UPHYPWR_PHY1_SUSPEND | \
EXYNOS_4210_UPHYPWR_PHY1_PWR | \
EXYNOS_4210_UPHYPWR_PHY1_SLEEP)
#define EXYNOS_4210_UPHYPWR_HSIC0_SUSPEND BIT(9)
#define EXYNOS_4210_UPHYPWR_HSIC0_SLEEP BIT(10)
#define EXYNOS_4210_UPHYPWR_HSIC0 ( \
EXYNOS_4210_UPHYPWR_HSIC0_SUSPEND | \
EXYNOS_4210_UPHYPWR_HSIC0_SLEEP)
#define EXYNOS_4210_UPHYPWR_HSIC1_SUSPEND BIT(11)
#define EXYNOS_4210_UPHYPWR_HSIC1_SLEEP BIT(12)
#define EXYNOS_4210_UPHYPWR_HSIC1 ( \
EXYNOS_4210_UPHYPWR_HSIC1_SUSPEND | \
EXYNOS_4210_UPHYPWR_HSIC1_SLEEP)
/* PHY clock control */
#define EXYNOS_4210_UPHYCLK 0x4
#define EXYNOS_4210_UPHYCLK_PHYFSEL_MASK (0x3 << 0)
#define EXYNOS_4210_UPHYCLK_PHYFSEL_OFFSET 0
#define EXYNOS_4210_UPHYCLK_PHYFSEL_48MHZ (0x0 << 0)
#define EXYNOS_4210_UPHYCLK_PHYFSEL_24MHZ (0x3 << 0)
#define EXYNOS_4210_UPHYCLK_PHYFSEL_12MHZ (0x2 << 0)
#define EXYNOS_4210_UPHYCLK_PHY0_ID_PULLUP BIT(2)
#define EXYNOS_4210_UPHYCLK_PHY0_COMMON_ON BIT(4)
#define EXYNOS_4210_UPHYCLK_PHY1_COMMON_ON BIT(7)
/* PHY reset control */
#define EXYNOS_4210_UPHYRST 0x8
#define EXYNOS_4210_URSTCON_PHY0 BIT(0)
#define EXYNOS_4210_URSTCON_OTG_HLINK BIT(1)
#define EXYNOS_4210_URSTCON_OTG_PHYLINK BIT(2)
#define EXYNOS_4210_URSTCON_PHY1_ALL BIT(3)
#define EXYNOS_4210_URSTCON_PHY1_P0 BIT(4)
#define EXYNOS_4210_URSTCON_PHY1_P1P2 BIT(5)
#define EXYNOS_4210_URSTCON_HOST_LINK_ALL BIT(6)
#define EXYNOS_4210_URSTCON_HOST_LINK_P0 BIT(7)
#define EXYNOS_4210_URSTCON_HOST_LINK_P1 BIT(8)
#define EXYNOS_4210_URSTCON_HOST_LINK_P2 BIT(9)
/* Isolation, configured in the power management unit */
#define EXYNOS_4210_USB_ISOL_DEVICE_OFFSET 0x704
#define EXYNOS_4210_USB_ISOL_DEVICE BIT(0)
#define EXYNOS_4210_USB_ISOL_HOST_OFFSET 0x708
#define EXYNOS_4210_USB_ISOL_HOST BIT(0)
/* USBYPHY1 Floating prevention */
#define EXYNOS_4210_UPHY1CON 0x34
#define EXYNOS_4210_UPHY1CON_FLOAT_PREVENTION 0x1
/* Mode switching SUB Device <-> Host */
#define EXYNOS_4210_MODE_SWITCH_OFFSET 0x21c
#define EXYNOS_4210_MODE_SWITCH_MASK 1
#define EXYNOS_4210_MODE_SWITCH_DEVICE 0
#define EXYNOS_4210_MODE_SWITCH_HOST 1
enum exynos4210_phy_id {
EXYNOS4210_DEVICE,
EXYNOS4210_HOST,
EXYNOS4210_HSIC0,
EXYNOS4210_HSIC1,
EXYNOS4210_NUM_PHYS,
};
/*
* exynos4210_rate_to_clk() converts the supplied clock rate to the value that
* can be written to the phy register.
*/
static int exynos4210_rate_to_clk(unsigned long rate, u32 *reg)
{
switch (rate) {
case 12 * MHZ:
*reg = EXYNOS_4210_UPHYCLK_PHYFSEL_12MHZ;
break;
case 24 * MHZ:
*reg = EXYNOS_4210_UPHYCLK_PHYFSEL_24MHZ;
break;
case 48 * MHZ:
*reg = EXYNOS_4210_UPHYCLK_PHYFSEL_48MHZ;
break;
default:
return -EINVAL;
}
return 0;
}
static void exynos4210_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 EXYNOS4210_DEVICE:
offset = EXYNOS_4210_USB_ISOL_DEVICE_OFFSET;
mask = EXYNOS_4210_USB_ISOL_DEVICE;
break;
case EXYNOS4210_HOST:
offset = EXYNOS_4210_USB_ISOL_HOST_OFFSET;
mask = EXYNOS_4210_USB_ISOL_HOST;
break;
default:
return;
};
regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 : mask);
}
static void exynos4210_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;
u32 clk;
switch (inst->cfg->id) {
case EXYNOS4210_DEVICE:
phypwr = EXYNOS_4210_UPHYPWR_PHY0;
rstbits = EXYNOS_4210_URSTCON_PHY0;
break;
case EXYNOS4210_HOST:
phypwr = EXYNOS_4210_UPHYPWR_PHY1;
rstbits = EXYNOS_4210_URSTCON_PHY1_ALL |
EXYNOS_4210_URSTCON_PHY1_P0 |
EXYNOS_4210_URSTCON_PHY1_P1P2 |
EXYNOS_4210_URSTCON_HOST_LINK_ALL |
EXYNOS_4210_URSTCON_HOST_LINK_P0;
writel(on, drv->reg_phy + EXYNOS_4210_UPHY1CON);
break;
case EXYNOS4210_HSIC0:
phypwr = EXYNOS_4210_UPHYPWR_HSIC0;
rstbits = EXYNOS_4210_URSTCON_PHY1_P1P2 |
EXYNOS_4210_URSTCON_HOST_LINK_P1;
break;
case EXYNOS4210_HSIC1:
phypwr = EXYNOS_4210_UPHYPWR_HSIC1;
rstbits = EXYNOS_4210_URSTCON_PHY1_P1P2 |
EXYNOS_4210_URSTCON_HOST_LINK_P2;
break;
};
if (on) {
clk = readl(drv->reg_phy + EXYNOS_4210_UPHYCLK);
clk &= ~EXYNOS_4210_UPHYCLK_PHYFSEL_MASK;
clk |= drv->ref_reg_val << EXYNOS_4210_UPHYCLK_PHYFSEL_OFFSET;
writel(clk, drv->reg_phy + EXYNOS_4210_UPHYCLK);
pwr = readl(drv->reg_phy + EXYNOS_4210_UPHYPWR);
pwr &= ~phypwr;
writel(pwr, drv->reg_phy + EXYNOS_4210_UPHYPWR);
rst = readl(drv->reg_phy + EXYNOS_4210_UPHYRST);
rst |= rstbits;
writel(rst, drv->reg_phy + EXYNOS_4210_UPHYRST);
udelay(10);
rst &= ~rstbits;
writel(rst, drv->reg_phy + EXYNOS_4210_UPHYRST);
/* The following delay is necessary for the reset sequence to be
* completed */
udelay(80);
} else {
pwr = readl(drv->reg_phy + EXYNOS_4210_UPHYPWR);
pwr |= phypwr;
writel(pwr, drv->reg_phy + EXYNOS_4210_UPHYPWR);
}
}
static int exynos4210_power_on(struct samsung_usb2_phy_instance *inst)
{
/* Order of initialisation is important - first power then isolation */
exynos4210_phy_pwr(inst, 1);
exynos4210_isol(inst, 0);
return 0;
}
static int exynos4210_power_off(struct samsung_usb2_phy_instance *inst)
{
exynos4210_isol(inst, 1);
exynos4210_phy_pwr(inst, 0);
return 0;
}
static const struct samsung_usb2_common_phy exynos4210_phys[] = {
{
.label = "device",
.id = EXYNOS4210_DEVICE,
.power_on = exynos4210_power_on,
.power_off = exynos4210_power_off,
},
{
.label = "host",
.id = EXYNOS4210_HOST,
.power_on = exynos4210_power_on,
.power_off = exynos4210_power_off,
},
{
.label = "hsic0",
.id = EXYNOS4210_HSIC0,
.power_on = exynos4210_power_on,
.power_off = exynos4210_power_off,
},
{
.label = "hsic1",
.id = EXYNOS4210_HSIC1,
.power_on = exynos4210_power_on,
.power_off = exynos4210_power_off,
},
{},
};
const struct samsung_usb2_phy_config exynos4210_usb2_phy_config = {
.has_mode_switch = 0,
.num_phys = EXYNOS4210_NUM_PHYS,
.phys = exynos4210_phys,
.rate_to_clk = exynos4210_rate_to_clk,
};