10b56e9a7SVivek Gautam /* 20b56e9a7SVivek Gautam * Samsung SoC USB 1.1/2.0 PHY driver - S5PV210 support 30b56e9a7SVivek Gautam * 40b56e9a7SVivek Gautam * Copyright (C) 2013 Samsung Electronics Co., Ltd. 50b56e9a7SVivek Gautam * Authors: Kamil Debski <k.debski@samsung.com> 60b56e9a7SVivek Gautam * 70b56e9a7SVivek Gautam * This program is free software; you can redistribute it and/or modify 80b56e9a7SVivek Gautam * it under the terms of the GNU General Public License version 2 as 90b56e9a7SVivek Gautam * published by the Free Software Foundation. 100b56e9a7SVivek Gautam */ 110b56e9a7SVivek Gautam 120b56e9a7SVivek Gautam #include <linux/delay.h> 130b56e9a7SVivek Gautam #include <linux/io.h> 140b56e9a7SVivek Gautam #include <linux/phy/phy.h> 150b56e9a7SVivek Gautam #include "phy-samsung-usb2.h" 160b56e9a7SVivek Gautam 170b56e9a7SVivek Gautam /* Exynos USB PHY registers */ 180b56e9a7SVivek Gautam 190b56e9a7SVivek Gautam /* PHY power control */ 200b56e9a7SVivek Gautam #define S5PV210_UPHYPWR 0x0 210b56e9a7SVivek Gautam 220b56e9a7SVivek Gautam #define S5PV210_UPHYPWR_PHY0_SUSPEND BIT(0) 230b56e9a7SVivek Gautam #define S5PV210_UPHYPWR_PHY0_PWR BIT(3) 240b56e9a7SVivek Gautam #define S5PV210_UPHYPWR_PHY0_OTG_PWR BIT(4) 250b56e9a7SVivek Gautam #define S5PV210_UPHYPWR_PHY0 ( \ 260b56e9a7SVivek Gautam S5PV210_UPHYPWR_PHY0_SUSPEND | \ 270b56e9a7SVivek Gautam S5PV210_UPHYPWR_PHY0_PWR | \ 280b56e9a7SVivek Gautam S5PV210_UPHYPWR_PHY0_OTG_PWR) 290b56e9a7SVivek Gautam 300b56e9a7SVivek Gautam #define S5PV210_UPHYPWR_PHY1_SUSPEND BIT(6) 310b56e9a7SVivek Gautam #define S5PV210_UPHYPWR_PHY1_PWR BIT(7) 320b56e9a7SVivek Gautam #define S5PV210_UPHYPWR_PHY1 ( \ 330b56e9a7SVivek Gautam S5PV210_UPHYPWR_PHY1_SUSPEND | \ 340b56e9a7SVivek Gautam S5PV210_UPHYPWR_PHY1_PWR) 350b56e9a7SVivek Gautam 360b56e9a7SVivek Gautam /* PHY clock control */ 370b56e9a7SVivek Gautam #define S5PV210_UPHYCLK 0x4 380b56e9a7SVivek Gautam 390b56e9a7SVivek Gautam #define S5PV210_UPHYCLK_PHYFSEL_MASK (0x3 << 0) 400b56e9a7SVivek Gautam #define S5PV210_UPHYCLK_PHYFSEL_48MHZ (0x0 << 0) 410b56e9a7SVivek Gautam #define S5PV210_UPHYCLK_PHYFSEL_24MHZ (0x3 << 0) 420b56e9a7SVivek Gautam #define S5PV210_UPHYCLK_PHYFSEL_12MHZ (0x2 << 0) 430b56e9a7SVivek Gautam 440b56e9a7SVivek Gautam #define S5PV210_UPHYCLK_PHY0_ID_PULLUP BIT(2) 450b56e9a7SVivek Gautam #define S5PV210_UPHYCLK_PHY0_COMMON_ON BIT(4) 460b56e9a7SVivek Gautam #define S5PV210_UPHYCLK_PHY1_COMMON_ON BIT(7) 470b56e9a7SVivek Gautam 480b56e9a7SVivek Gautam /* PHY reset control */ 490b56e9a7SVivek Gautam #define S5PV210_UPHYRST 0x8 500b56e9a7SVivek Gautam 510b56e9a7SVivek Gautam #define S5PV210_URSTCON_PHY0 BIT(0) 520b56e9a7SVivek Gautam #define S5PV210_URSTCON_OTG_HLINK BIT(1) 530b56e9a7SVivek Gautam #define S5PV210_URSTCON_OTG_PHYLINK BIT(2) 540b56e9a7SVivek Gautam #define S5PV210_URSTCON_PHY1_ALL BIT(3) 550b56e9a7SVivek Gautam #define S5PV210_URSTCON_HOST_LINK_ALL BIT(4) 560b56e9a7SVivek Gautam 570b56e9a7SVivek Gautam /* Isolation, configured in the power management unit */ 580b56e9a7SVivek Gautam #define S5PV210_USB_ISOL_OFFSET 0x680c 590b56e9a7SVivek Gautam #define S5PV210_USB_ISOL_DEVICE BIT(0) 600b56e9a7SVivek Gautam #define S5PV210_USB_ISOL_HOST BIT(1) 610b56e9a7SVivek Gautam 620b56e9a7SVivek Gautam 630b56e9a7SVivek Gautam enum s5pv210_phy_id { 640b56e9a7SVivek Gautam S5PV210_DEVICE, 650b56e9a7SVivek Gautam S5PV210_HOST, 660b56e9a7SVivek Gautam S5PV210_NUM_PHYS, 670b56e9a7SVivek Gautam }; 680b56e9a7SVivek Gautam 690b56e9a7SVivek Gautam /* 700b56e9a7SVivek Gautam * s5pv210_rate_to_clk() converts the supplied clock rate to the value that 710b56e9a7SVivek Gautam * can be written to the phy register. 720b56e9a7SVivek Gautam */ 730b56e9a7SVivek Gautam static int s5pv210_rate_to_clk(unsigned long rate, u32 *reg) 740b56e9a7SVivek Gautam { 750b56e9a7SVivek Gautam switch (rate) { 760b56e9a7SVivek Gautam case 12 * MHZ: 770b56e9a7SVivek Gautam *reg = S5PV210_UPHYCLK_PHYFSEL_12MHZ; 780b56e9a7SVivek Gautam break; 790b56e9a7SVivek Gautam case 24 * MHZ: 800b56e9a7SVivek Gautam *reg = S5PV210_UPHYCLK_PHYFSEL_24MHZ; 810b56e9a7SVivek Gautam break; 820b56e9a7SVivek Gautam case 48 * MHZ: 830b56e9a7SVivek Gautam *reg = S5PV210_UPHYCLK_PHYFSEL_48MHZ; 840b56e9a7SVivek Gautam break; 850b56e9a7SVivek Gautam default: 860b56e9a7SVivek Gautam return -EINVAL; 870b56e9a7SVivek Gautam } 880b56e9a7SVivek Gautam 890b56e9a7SVivek Gautam return 0; 900b56e9a7SVivek Gautam } 910b56e9a7SVivek Gautam 920b56e9a7SVivek Gautam static void s5pv210_isol(struct samsung_usb2_phy_instance *inst, bool on) 930b56e9a7SVivek Gautam { 940b56e9a7SVivek Gautam struct samsung_usb2_phy_driver *drv = inst->drv; 950b56e9a7SVivek Gautam u32 mask; 960b56e9a7SVivek Gautam 970b56e9a7SVivek Gautam switch (inst->cfg->id) { 980b56e9a7SVivek Gautam case S5PV210_DEVICE: 990b56e9a7SVivek Gautam mask = S5PV210_USB_ISOL_DEVICE; 1000b56e9a7SVivek Gautam break; 1010b56e9a7SVivek Gautam case S5PV210_HOST: 1020b56e9a7SVivek Gautam mask = S5PV210_USB_ISOL_HOST; 1030b56e9a7SVivek Gautam break; 1040b56e9a7SVivek Gautam default: 1050b56e9a7SVivek Gautam return; 1060b56e9a7SVivek Gautam } 1070b56e9a7SVivek Gautam 1080b56e9a7SVivek Gautam regmap_update_bits(drv->reg_pmu, S5PV210_USB_ISOL_OFFSET, 1090b56e9a7SVivek Gautam mask, on ? 0 : mask); 1100b56e9a7SVivek Gautam } 1110b56e9a7SVivek Gautam 1120b56e9a7SVivek Gautam static void s5pv210_phy_pwr(struct samsung_usb2_phy_instance *inst, bool on) 1130b56e9a7SVivek Gautam { 1140b56e9a7SVivek Gautam struct samsung_usb2_phy_driver *drv = inst->drv; 1150b56e9a7SVivek Gautam u32 rstbits = 0; 1160b56e9a7SVivek Gautam u32 phypwr = 0; 1170b56e9a7SVivek Gautam u32 rst; 1180b56e9a7SVivek Gautam u32 pwr; 1190b56e9a7SVivek Gautam 1200b56e9a7SVivek Gautam switch (inst->cfg->id) { 1210b56e9a7SVivek Gautam case S5PV210_DEVICE: 1220b56e9a7SVivek Gautam phypwr = S5PV210_UPHYPWR_PHY0; 1230b56e9a7SVivek Gautam rstbits = S5PV210_URSTCON_PHY0; 1240b56e9a7SVivek Gautam break; 1250b56e9a7SVivek Gautam case S5PV210_HOST: 1260b56e9a7SVivek Gautam phypwr = S5PV210_UPHYPWR_PHY1; 1270b56e9a7SVivek Gautam rstbits = S5PV210_URSTCON_PHY1_ALL | 1280b56e9a7SVivek Gautam S5PV210_URSTCON_HOST_LINK_ALL; 1290b56e9a7SVivek Gautam break; 1300b56e9a7SVivek Gautam } 1310b56e9a7SVivek Gautam 1320b56e9a7SVivek Gautam if (on) { 1330b56e9a7SVivek Gautam writel(drv->ref_reg_val, drv->reg_phy + S5PV210_UPHYCLK); 1340b56e9a7SVivek Gautam 1350b56e9a7SVivek Gautam pwr = readl(drv->reg_phy + S5PV210_UPHYPWR); 1360b56e9a7SVivek Gautam pwr &= ~phypwr; 1370b56e9a7SVivek Gautam writel(pwr, drv->reg_phy + S5PV210_UPHYPWR); 1380b56e9a7SVivek Gautam 1390b56e9a7SVivek Gautam rst = readl(drv->reg_phy + S5PV210_UPHYRST); 1400b56e9a7SVivek Gautam rst |= rstbits; 1410b56e9a7SVivek Gautam writel(rst, drv->reg_phy + S5PV210_UPHYRST); 1420b56e9a7SVivek Gautam udelay(10); 1430b56e9a7SVivek Gautam rst &= ~rstbits; 1440b56e9a7SVivek Gautam writel(rst, drv->reg_phy + S5PV210_UPHYRST); 1450b56e9a7SVivek Gautam } else { 1460b56e9a7SVivek Gautam pwr = readl(drv->reg_phy + S5PV210_UPHYPWR); 1470b56e9a7SVivek Gautam pwr |= phypwr; 1480b56e9a7SVivek Gautam writel(pwr, drv->reg_phy + S5PV210_UPHYPWR); 1490b56e9a7SVivek Gautam } 1500b56e9a7SVivek Gautam } 1510b56e9a7SVivek Gautam 1520b56e9a7SVivek Gautam static int s5pv210_power_on(struct samsung_usb2_phy_instance *inst) 1530b56e9a7SVivek Gautam { 1540b56e9a7SVivek Gautam s5pv210_isol(inst, 0); 1550b56e9a7SVivek Gautam s5pv210_phy_pwr(inst, 1); 1560b56e9a7SVivek Gautam 1570b56e9a7SVivek Gautam return 0; 1580b56e9a7SVivek Gautam } 1590b56e9a7SVivek Gautam 1600b56e9a7SVivek Gautam static int s5pv210_power_off(struct samsung_usb2_phy_instance *inst) 1610b56e9a7SVivek Gautam { 1620b56e9a7SVivek Gautam s5pv210_phy_pwr(inst, 0); 1630b56e9a7SVivek Gautam s5pv210_isol(inst, 1); 1640b56e9a7SVivek Gautam 1650b56e9a7SVivek Gautam return 0; 1660b56e9a7SVivek Gautam } 1670b56e9a7SVivek Gautam 1680b56e9a7SVivek Gautam static const struct samsung_usb2_common_phy s5pv210_phys[S5PV210_NUM_PHYS] = { 1690b56e9a7SVivek Gautam [S5PV210_DEVICE] = { 1700b56e9a7SVivek Gautam .label = "device", 1710b56e9a7SVivek Gautam .id = S5PV210_DEVICE, 1720b56e9a7SVivek Gautam .power_on = s5pv210_power_on, 1730b56e9a7SVivek Gautam .power_off = s5pv210_power_off, 1740b56e9a7SVivek Gautam }, 1750b56e9a7SVivek Gautam [S5PV210_HOST] = { 1760b56e9a7SVivek Gautam .label = "host", 1770b56e9a7SVivek Gautam .id = S5PV210_HOST, 1780b56e9a7SVivek Gautam .power_on = s5pv210_power_on, 1790b56e9a7SVivek Gautam .power_off = s5pv210_power_off, 1800b56e9a7SVivek Gautam }, 1810b56e9a7SVivek Gautam }; 1820b56e9a7SVivek Gautam 1830b56e9a7SVivek Gautam const struct samsung_usb2_phy_config s5pv210_usb2_phy_config = { 1840b56e9a7SVivek Gautam .num_phys = ARRAY_SIZE(s5pv210_phys), 1850b56e9a7SVivek Gautam .phys = s5pv210_phys, 1860b56e9a7SVivek Gautam .rate_to_clk = s5pv210_rate_to_clk, 1870b56e9a7SVivek Gautam }; 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