/*
* Samsung SoC USB 1.1/2.0 PHY driver - S5PV210 support
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Authors: Kamil Debski <k.debski@samsung.com>
*
* 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 "phy-samsung-usb2.h"
/* Exynos USB PHY registers */
/* PHY power control */
#define S5PV210_UPHYPWR 0x0
#define S5PV210_UPHYPWR_PHY0_SUSPEND BIT(0)
#define S5PV210_UPHYPWR_PHY0_PWR BIT(3)
#define S5PV210_UPHYPWR_PHY0_OTG_PWR BIT(4)
#define S5PV210_UPHYPWR_PHY0 ( \
S5PV210_UPHYPWR_PHY0_SUSPEND | \
S5PV210_UPHYPWR_PHY0_PWR | \
S5PV210_UPHYPWR_PHY0_OTG_PWR)
#define S5PV210_UPHYPWR_PHY1_SUSPEND BIT(6)
#define S5PV210_UPHYPWR_PHY1_PWR BIT(7)
#define S5PV210_UPHYPWR_PHY1 ( \
S5PV210_UPHYPWR_PHY1_SUSPEND | \
S5PV210_UPHYPWR_PHY1_PWR)
/* PHY clock control */
#define S5PV210_UPHYCLK 0x4
#define S5PV210_UPHYCLK_PHYFSEL_MASK (0x3 << 0)
#define S5PV210_UPHYCLK_PHYFSEL_48MHZ (0x0 << 0)
#define S5PV210_UPHYCLK_PHYFSEL_24MHZ (0x3 << 0)
#define S5PV210_UPHYCLK_PHYFSEL_12MHZ (0x2 << 0)
#define S5PV210_UPHYCLK_PHY0_ID_PULLUP BIT(2)
#define S5PV210_UPHYCLK_PHY0_COMMON_ON BIT(4)
#define S5PV210_UPHYCLK_PHY1_COMMON_ON BIT(7)
/* PHY reset control */
#define S5PV210_UPHYRST 0x8
#define S5PV210_URSTCON_PHY0 BIT(0)
#define S5PV210_URSTCON_OTG_HLINK BIT(1)
#define S5PV210_URSTCON_OTG_PHYLINK BIT(2)
#define S5PV210_URSTCON_PHY1_ALL BIT(3)
#define S5PV210_URSTCON_HOST_LINK_ALL BIT(4)
/* Isolation, configured in the power management unit */
#define S5PV210_USB_ISOL_OFFSET 0x680c
#define S5PV210_USB_ISOL_DEVICE BIT(0)
#define S5PV210_USB_ISOL_HOST BIT(1)
enum s5pv210_phy_id {
S5PV210_DEVICE,
S5PV210_HOST,
S5PV210_NUM_PHYS,
};
/*
* s5pv210_rate_to_clk() converts the supplied clock rate to the value that
* can be written to the phy register.
*/
static int s5pv210_rate_to_clk(unsigned long rate, u32 *reg)
{
switch (rate) {
case 12 * MHZ:
*reg = S5PV210_UPHYCLK_PHYFSEL_12MHZ;
break;
case 24 * MHZ:
*reg = S5PV210_UPHYCLK_PHYFSEL_24MHZ;
break;
case 48 * MHZ:
*reg = S5PV210_UPHYCLK_PHYFSEL_48MHZ;
break;
default:
return -EINVAL;
}
return 0;
}
static void s5pv210_isol(struct samsung_usb2_phy_instance *inst, bool on)
{
struct samsung_usb2_phy_driver *drv = inst->drv;
u32 mask;
switch (inst->cfg->id) {
case S5PV210_DEVICE:
mask = S5PV210_USB_ISOL_DEVICE;
break;
case S5PV210_HOST:
mask = S5PV210_USB_ISOL_HOST;
break;
default:
return;
};
regmap_update_bits(drv->reg_pmu, S5PV210_USB_ISOL_OFFSET,
mask, on ? 0 : mask);
}
static void s5pv210_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 S5PV210_DEVICE:
phypwr = S5PV210_UPHYPWR_PHY0;
rstbits = S5PV210_URSTCON_PHY0;
break;
case S5PV210_HOST:
phypwr = S5PV210_UPHYPWR_PHY1;
rstbits = S5PV210_URSTCON_PHY1_ALL |
S5PV210_URSTCON_HOST_LINK_ALL;
break;
};
if (on) {
writel(drv->ref_reg_val, drv->reg_phy + S5PV210_UPHYCLK);
pwr = readl(drv->reg_phy + S5PV210_UPHYPWR);
pwr &= ~phypwr;
writel(pwr, drv->reg_phy + S5PV210_UPHYPWR);
rst = readl(drv->reg_phy + S5PV210_UPHYRST);
rst |= rstbits;
writel(rst, drv->reg_phy + S5PV210_UPHYRST);
udelay(10);
rst &= ~rstbits;
writel(rst, drv->reg_phy + S5PV210_UPHYRST);
} else {
pwr = readl(drv->reg_phy + S5PV210_UPHYPWR);
pwr |= phypwr;
writel(pwr, drv->reg_phy + S5PV210_UPHYPWR);
}
}
static int s5pv210_power_on(struct samsung_usb2_phy_instance *inst)
{
s5pv210_isol(inst, 0);
s5pv210_phy_pwr(inst, 1);
return 0;
}
static int s5pv210_power_off(struct samsung_usb2_phy_instance *inst)
{
s5pv210_phy_pwr(inst, 0);
s5pv210_isol(inst, 1);
return 0;
}
static const struct samsung_usb2_common_phy s5pv210_phys[S5PV210_NUM_PHYS] = {
[S5PV210_DEVICE] = {
.label = "device",
.id = S5PV210_DEVICE,
.power_on = s5pv210_power_on,
.power_off = s5pv210_power_off,
},
[S5PV210_HOST] = {
.label = "host",
.id = S5PV210_HOST,
.power_on = s5pv210_power_on,
.power_off = s5pv210_power_off,
},
};
const struct samsung_usb2_phy_config s5pv210_usb2_phy_config = {
.num_phys = ARRAY_SIZE(s5pv210_phys),
.phys = s5pv210_phys,
.rate_to_clk = s5pv210_rate_to_clk,
};
