diff options
Diffstat (limited to 'drivers/phy/samsung/phy-exynos4210-usb2.c')
| -rw-r--r-- | drivers/phy/samsung/phy-exynos4210-usb2.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/phy/samsung/phy-exynos4210-usb2.c b/drivers/phy/samsung/phy-exynos4210-usb2.c new file mode 100644 index 000000000..3898a7f58 --- /dev/null +++ b/drivers/phy/samsung/phy-exynos4210-usb2.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Samsung SoC USB 1.1/2.0 PHY driver - Exynos 4210 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_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, +}; |