Add a new driver for the Exynos USB PHY. The new driver uses the generic PHY framework. The driver includes support for the Exynos 4x10 and 4x12 SoC families. Signed-off-by: Kamil Debski <k.debski@xxxxxxxxxxx> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> --- .../devicetree/bindings/phy/samsung-usbphy.txt | 54 ++++ drivers/phy/Kconfig | 20 ++ drivers/phy/Makefile | 3 + drivers/phy/phy-exynos4210-usb2.c | 264 +++++++++++++++++ drivers/phy/phy-exynos4212-usb2.c | 312 ++++++++++++++++++++ drivers/phy/phy-samsung-usb2.c | 228 ++++++++++++++ drivers/phy/phy-samsung-usb2.h | 72 +++++ 7 files changed, 953 insertions(+) create mode 100644 Documentation/devicetree/bindings/phy/samsung-usbphy.txt create mode 100644 drivers/phy/phy-exynos4210-usb2.c create mode 100644 drivers/phy/phy-exynos4212-usb2.c create mode 100644 drivers/phy/phy-samsung-usb2.c create mode 100644 drivers/phy/phy-samsung-usb2.h diff --git a/Documentation/devicetree/bindings/phy/samsung-usbphy.txt b/Documentation/devicetree/bindings/phy/samsung-usbphy.txt new file mode 100644 index 0000000..cadbf70 --- /dev/null +++ b/Documentation/devicetree/bindings/phy/samsung-usbphy.txt @@ -0,0 +1,54 @@ +Samsung S5P/EXYNOS SoC series USB PHY +------------------------------------------------- + +Required properties: +- compatible : should be one of the listed compatibles: + - "samsung,exynos4210-usb2-phy" + - "samsung,exynos4212-usb2-phy" +- reg : a list of registers used by phy driver + - first and obligatory is the location of phy modules registers +- samsung,sysreg-phandle - handle to syscon used to control the system registers +- samsung,pmureg-phandle - handle to syscon used to control PMU registers +- #phy-cells : from the generic phy bindings, must be 1; +- clocks and clock-names: + - the "phy" clocks is required by the phy module + - next for each of the phys a clock has to be assidned, this clock + will be used to determine clocking frequency for the phys + (the labels are specified in the paragraph below) + +The first phandle argument in the PHY specifier identifies the PHY, its +meaning is compatible dependent. For the currently supported SoCs (Exynos 4210 +and Exynos 4212) it is as follows: + 0 - USB device ("device"), + 1 - USB host ("host"), + 2 - HSIC0 ("hsic0"), + 3 - HSIC1 ("hsic1"), + +Exynos 4210 and Exynos 4212 use mode switching and require that mode switch +register is supplied. + +Example: + +For Exynos 4412 (compatible with Exynos 4212): + +usbphy: phy@125B0000 { + compatible = "samsung,exynos4212-usb2-phy"; + reg = <0x125B0000 0x100 0x10020704 0x0c 0x1001021c 0x4>; + clocks = <&clock 305>, <&clock 2>, <&clock 2>, <&clock 2>, + <&clock 2>; + clock-names = "phy", "device", "host", "hsic0", "hsic1"; + status = "okay"; + #phy-cells = <1>; + samsung,sysreg-phandle = <&sys_reg>; + samsung,pmureg-phandle = <&pmu_reg>; +}; + +Then the PHY can be used in other nodes such as: + +phy-consumer@12340000 { + phys = <&usbphy 2>; + phy-names = "phy"; +}; + +Refer to DT bindings documentation of particular PHY consumer devices for more +information about required PHYs and the way of specification. diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index a344f3d..b29018f 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -51,4 +51,24 @@ config PHY_EXYNOS_DP_VIDEO help Support for Display Port PHY found on Samsung EXYNOS SoCs. +config PHY_SAMSUNG_USB2 + tristate "Samsung USB 2.0 PHY driver" + help + Enable this to support Samsung USB phy helper driver for Samsung SoCs. + This driver provides common interface to interact, for Samsung + USB 2.0 PHY driver. + +config PHY_EXYNOS4210_USB2 + bool "Support for Exynos 4210" + depends on PHY_SAMSUNG_USB2 + depends on CPU_EXYNOS4210 + help + Enable USB PHY support for Exynos 4210 + +config PHY_EXYNOS4212_USB2 + bool "Support for Exynos 4212" + depends on PHY_SAMSUNG_USB2 + depends on (SOC_EXYNOS4212 || SOC_EXYNOS4412) + help + Enable USB PHY support for Exynos 4212 endmenu diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index d0caae9..9f4befd 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -7,3 +7,6 @@ obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o +obj-$(CONFIG_PHY_SAMSUNG_USB2) += phy-samsung-usb2.o +obj-$(CONFIG_PHY_EXYNOS4210_USB2) += phy-exynos4210-usb2.o +obj-$(CONFIG_PHY_EXYNOS4212_USB2) += phy-exynos4212-usb2.o diff --git a/drivers/phy/phy-exynos4210-usb2.c b/drivers/phy/phy-exynos4210-usb2.c new file mode 100644 index 0000000..a02e5c2 --- /dev/null +++ b/drivers/phy/phy-exynos4210-usb2.c @@ -0,0 +1,264 @@ +/* + * Samsung SoC USB 1.1/2.0 PHY driver - Exynos 4210 support + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * Author: Kamil Debski <k.debski@xxxxxxxxxxx> + * + * 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/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/spinlock.h> +#include "phy-samsung-usb2.h" + +/* Exynos USB PHY registers */ + +/* PHY power control */ +#define EXYNOS_4210_UPHYPWR 0x0 + +#define EXYNOS_4210_UPHYPWR_PHY0_SUSPEND (1 << 0) +#define EXYNOS_4210_UPHYPWR_PHY0_PWR (1 << 3) +#define EXYNOS_4210_UPHYPWR_PHY0_OTG_PWR (1 << 4) +#define EXYNOS_4210_UPHYPWR_PHY0_SLEEP (1 << 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 (1 << 6) +#define EXYNOS_4210_UPHYPWR_PHY1_PWR (1 << 7) +#define EXYNOS_4210_UPHYPWR_PHY1_SLEEP (1 << 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_HSCI0_SUSPEND (1 << 9) +#define EXYNOS_4210_UPHYPWR_HSCI0_SLEEP (1 << 10) +#define EXYNOS_4210_UPHYPWR_HSCI0 ( \ + EXYNOS_4210_UPHYPWR_HSCI0_SUSPEND | \ + EXYNOS_4210_UPHYPWR_HSCI0_SLEEP) + +#define EXYNOS_4210_UPHYPWR_HSCI1_SUSPEND (1 << 11) +#define EXYNOS_4210_UPHYPWR_HSCI1_SLEEP (1 << 12) +#define EXYNOS_4210_UPHYPWR_HSCI1 ( \ + EXYNOS_4210_UPHYPWR_HSCI1_SUSPEND | \ + EXYNOS_4210_UPHYPWR_HSCI1_SLEEP) + +/* PHY clock control */ +#define EXYNOS_4210_UPHYCLK 0x4 + +#define EXYNOS_4210_UPHYCLK_PHYFSEL_MASK (0x3 << 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 (0x1 << 2) +#define EXYNOS_4210_UPHYCLK_PHY0_COMMON_ON (0x1 << 4) +#define EXYNOS_4210_UPHYCLK_PHY1_COMMON_ON (0x1 << 7) + +/* PHY reset control */ +#define EXYNOS_4210_UPHYRST 0x8 + +#define EXYNOS_4210_URSTCON_PHY0 (1 << 0) +#define EXYNOS_4210_URSTCON_OTG_HLINK (1 << 1) +#define EXYNOS_4210_URSTCON_OTG_PHYLINK (1 << 2) +#define EXYNOS_4210_URSTCON_PHY1_ALL (1 << 3) +#define EXYNOS_4210_URSTCON_PHY1_P0 (1 << 4) +#define EXYNOS_4210_URSTCON_PHY1_P1P2 (1 << 5) +#define EXYNOS_4210_URSTCON_HOST_LINK_ALL (1 << 6) +#define EXYNOS_4210_URSTCON_HOST_LINK_P0 (1 << 7) +#define EXYNOS_4210_URSTCON_HOST_LINK_P1 (1 << 8) +#define EXYNOS_4210_URSTCON_HOST_LINK_P2 (1 << 9) + +/* Isolation, configured in the power management unit */ +#define EXYNOS_4210_USB_ISOL_DEVICE_OFFSET 0x704 +#define EXYNOS_4210_USB_ISOL_DEVICE (1 << 0) +#define EXYNOS_4210_USB_ISOL_HOST_OFFSET 0x708 +#define EXYNOS_4210_USB_ISOL_HOST (1 << 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; + + 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_HSCI0; + rstbits = EXYNOS_4210_URSTCON_PHY1_P1P2 | + EXYNOS_4210_URSTCON_HOST_LINK_P1; + break; + case EXYNOS4210_HSIC1: + phypwr = EXYNOS_4210_UPHYPWR_HSCI1; + rstbits = EXYNOS_4210_URSTCON_PHY1_P1P2 | + EXYNOS_4210_URSTCON_HOST_LINK_P2; + break; + }; + + if (on) { + writel(inst->clk_reg_val, 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); + } 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, + .rate_to_clk = exynos4210_rate_to_clk, + .power_on = exynos4210_power_on, + .power_off = exynos4210_power_off, + }, + { + .label = "host", + .id = EXYNOS4210_HOST, + .rate_to_clk = exynos4210_rate_to_clk, + .power_on = exynos4210_power_on, + .power_off = exynos4210_power_off, + }, + { + .label = "hsic0", + .id = EXYNOS4210_HSIC0, + .rate_to_clk = exynos4210_rate_to_clk, + .power_on = exynos4210_power_on, + .power_off = exynos4210_power_off, + }, + { + .label = "hsic1", + .id = EXYNOS4210_HSIC1, + .rate_to_clk = exynos4210_rate_to_clk, + .power_on = exynos4210_power_on, + .power_off = exynos4210_power_off, + }, + {}, +}; + +const struct samsung_usb2_phy_config exynos4210_usb2_phy_config = { + .num_phys = EXYNOS4210_NUM_PHYS, + .phys = exynos4210_phys, + .has_mode_switch = 1, +}; + diff --git a/drivers/phy/phy-exynos4212-usb2.c b/drivers/phy/phy-exynos4212-usb2.c new file mode 100644 index 0000000..375ece0 --- /dev/null +++ b/drivers/phy/phy-exynos4212-usb2.c @@ -0,0 +1,312 @@ +/* + * Samsung S5P/EXYNOS SoC series USB PHY driver - Exynos 4212 support + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * Author: Kamil Debski <k.debski@xxxxxxxxxxx> + * + * 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/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/spinlock.h> +#include "phy-samsung-usb2.h" + +/* Exynos USB PHY registers */ + +/* PHY power control */ +#define EXYNOS_4212_UPHYPWR 0x0 + +#define EXYNOS_4212_UPHYPWR_DEV_SUSPEND (1 << 0) +#define EXYNOS_4212_UPHYPWR_DEV_PWR (1 << 3) +#define EXYNOS_4212_UPHYPWR_DEV_OTG_PWR (1 << 4) +#define EXYNOS_4212_UPHYPWR_DEV_SLEEP (1 << 5) +#define EXYNOS_4212_UPHYPWR_DEV ( \ + EXYNOS_4212_UPHYPWR_DEV_SUSPEND | \ + EXYNOS_4212_UPHYPWR_DEV_PWR | \ + EXYNOS_4212_UPHYPWR_DEV_OTG_PWR | \ + EXYNOS_4212_UPHYPWR_DEV_SLEEP) + +#define EXYNOS_4212_UPHYPWR_HOST_SUSPEND (1 << 6) +#define EXYNOS_4212_UPHYPWR_HOST_PWR (1 << 7) +#define EXYNOS_4212_UPHYPWR_HOST_SLEEP (1 << 8) +#define EXYNOS_4212_UPHYPWR_HOST ( \ + EXYNOS_4212_UPHYPWR_HOST_SUSPEND | \ + EXYNOS_4212_UPHYPWR_HOST_PWR | \ + EXYNOS_4212_UPHYPWR_HOST_SLEEP) + +#define EXYNOS_4212_UPHYPWR_HSCI0_SUSPEND (1 << 9) +#define EXYNOS_4212_UPHYPWR_HSCI0_PWR (1 << 10) +#define EXYNOS_4212_UPHYPWR_HSCI0_SLEEP (1 << 11) +#define EXYNOS_4212_UPHYPWR_HSCI0 ( \ + EXYNOS_4212_UPHYPWR_HSCI0_SUSPEND | \ + EXYNOS_4212_UPHYPWR_HSCI0_PWR | \ + EXYNOS_4212_UPHYPWR_HSCI0_SLEEP) + +#define EXYNOS_4212_UPHYPWR_HSCI1_SUSPEND (1 << 12) +#define EXYNOS_4212_UPHYPWR_HSCI1_PWR (1 << 13) +#define EXYNOS_4212_UPHYPWR_HSCI1_SLEEP (1 << 14) +#define EXYNOS_4212_UPHYPWR_HSCI1 ( \ + EXYNOS_4212_UPHYPWR_HSCI1_SUSPEND | \ + EXYNOS_4212_UPHYPWR_HSCI1_PWR | \ + EXYNOS_4212_UPHYPWR_HSCI1_SLEEP) + +/* PHY clock control */ +#define EXYNOS_4212_UPHYCLK 0x4 + +#define EXYNOS_4212_UPHYCLK_PHYFSEL_MASK (0x7 << 0) +#define EXYNOS_4212_UPHYCLK_PHYFSEL_9MHZ6 (0x0 << 0) +#define EXYNOS_4212_UPHYCLK_PHYFSEL_10MHZ (0x1 << 0) +#define EXYNOS_4212_UPHYCLK_PHYFSEL_12MHZ (0x2 << 0) +#define EXYNOS_4212_UPHYCLK_PHYFSEL_19MHZ2 (0x3 << 0) +#define EXYNOS_4212_UPHYCLK_PHYFSEL_20MHZ (0x4 << 0) +#define EXYNOS_4212_UPHYCLK_PHYFSEL_24MHZ (0x5 << 0) +#define EXYNOS_4212_UPHYCLK_PHYFSEL_50MHZ (0x7 << 0) + +#define EXYNOS_4212_UPHYCLK_PHY0_ID_PULLUP (0x1 << 3) +#define EXYNOS_4212_UPHYCLK_PHY0_COMMON_ON (0x1 << 4) +#define EXYNOS_4212_UPHYCLK_PHY1_COMMON_ON (0x1 << 7) + +#define EXYNOS_4212_UPHYCLK_HSIC_REFCLK_MASK (0x7f << 10) +#define EXYNOS_4212_UPHYCLK_HSIC_REFCLK_12MHZ (0x24 << 10) +#define EXYNOS_4212_UPHYCLK_HSIC_REFCLK_15MHZ (0x1c << 10) +#define EXYNOS_4212_UPHYCLK_HSIC_REFCLK_16MHZ (0x1a << 10) +#define EXYNOS_4212_UPHYCLK_HSIC_REFCLK_19MHZ2 (0x15 << 10) +#define EXYNOS_4212_UPHYCLK_HSIC_REFCLK_20MHZ (0x14 << 10) + +/* PHY reset control */ +#define EXYNOS_4212_UPHYRST 0x8 + +#define EXYNOS_4212_URSTCON_DEVICE (1 << 0) +#define EXYNOS_4212_URSTCON_OTG_HLINK (1 << 1) +#define EXYNOS_4212_URSTCON_OTG_PHYLINK (1 << 2) +#define EXYNOS_4212_URSTCON_HOST_PHY (1 << 3) +#define EXYNOS_4212_URSTCON_PHY1 (1 << 4) +#define EXYNOS_4212_URSTCON_HSIC0 (1 << 5) +#define EXYNOS_4212_URSTCON_HSIC1 (1 << 6) +#define EXYNOS_4212_URSTCON_HOST_LINK_ALL (1 << 7) +#define EXYNOS_4212_URSTCON_HOST_LINK_P0 (1 << 8) +#define EXYNOS_4212_URSTCON_HOST_LINK_P1 (1 << 9) +#define EXYNOS_4212_URSTCON_HOST_LINK_P2 (1 << 10) + +/* Isolation, configured in the power management unit */ +#define EXYNOS_4212_USB_ISOL_OFFSET 0x704 +#define EXYNOS_4212_USB_ISOL_OTG (1 << 0) +#define EXYNOS_4212_USB_ISOL_HSIC0_OFFSET 0x708 +#define EXYNOS_4212_USB_ISOL_HSIC0 (1 << 0) +#define EXYNOS_4212_USB_ISOL_HSIC1_OFFSET 0x70c +#define EXYNOS_4212_USB_ISOL_HSIC1 (1 << 0) + +/* Mode switching SUB Device <-> Host */ +#define EXYNOS_4212_MODE_SWITCH_OFFSET 0x21c +#define EXYNOS_4212_MODE_SWITCH_MASK 1 +#define EXYNOS_4212_MODE_SWITCH_DEVICE 0 +#define EXYNOS_4212_MODE_SWITCH_HOST 1 + +enum exynos4x12_phy_id { + EXYNOS4212_DEVICE, + EXYNOS4212_HOST, + EXYNOS4212_HSIC0, + EXYNOS4212_HSIC1, + EXYNOS4212_NUM_PHYS, +}; + +/* + * exynos4212_rate_to_clk() converts the supplied clock rate to the value that + * can be written to the phy register. + */ +static int exynos4212_rate_to_clk(unsigned long rate, u32 *reg) +{ + /* EXYNOS_4212_UPHYCLK_PHYFSEL_MASK */ + + switch (rate) { + case 9600 * KHZ: + *reg = EXYNOS_4212_UPHYCLK_PHYFSEL_9MHZ6; + break; + case 10 * MHZ: + *reg = EXYNOS_4212_UPHYCLK_PHYFSEL_10MHZ; + break; + case 12 * MHZ: + *reg = EXYNOS_4212_UPHYCLK_PHYFSEL_12MHZ; + break; + case 19200 * KHZ: + *reg = EXYNOS_4212_UPHYCLK_PHYFSEL_19MHZ2; + break; + case 20 * MHZ: + *reg = EXYNOS_4212_UPHYCLK_PHYFSEL_20MHZ; + break; + case 24 * MHZ: + *reg = EXYNOS_4212_UPHYCLK_PHYFSEL_24MHZ; + break; + case 50 * MHZ: + *reg = EXYNOS_4212_UPHYCLK_PHYFSEL_50MHZ; + break; + default: + return -EINVAL; + } + + return 0; +} + +static void exynos4212_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 EXYNOS4212_DEVICE: + case EXYNOS4212_HOST: + offset = EXYNOS_4212_USB_ISOL_OFFSET; + mask = EXYNOS_4212_USB_ISOL_OTG; + break; + case EXYNOS4212_HSIC0: + offset = EXYNOS_4212_USB_ISOL_HSIC0_OFFSET; + mask = EXYNOS_4212_USB_ISOL_HSIC0; + break; + case EXYNOS4212_HSIC1: + offset = EXYNOS_4212_USB_ISOL_HSIC1_OFFSET; + mask = EXYNOS_4212_USB_ISOL_HSIC1; + break; + default: + return; + }; + + regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 : mask); +} + +static void exynos4212_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 EXYNOS4212_DEVICE: + phypwr = EXYNOS_4212_UPHYPWR_DEV; + rstbits = EXYNOS_4212_URSTCON_DEVICE; + break; + case EXYNOS4212_HOST: + phypwr = EXYNOS_4212_UPHYPWR_HOST; + rstbits = EXYNOS_4212_URSTCON_HOST_PHY; + break; + case EXYNOS4212_HSIC0: + phypwr = EXYNOS_4212_UPHYPWR_HSCI0; + rstbits = EXYNOS_4212_URSTCON_HSIC1 | + EXYNOS_4212_URSTCON_HOST_LINK_P0 | + EXYNOS_4212_URSTCON_HOST_PHY; + break; + case EXYNOS4212_HSIC1: + phypwr = EXYNOS_4212_UPHYPWR_HSCI1; + rstbits = EXYNOS_4212_URSTCON_HSIC1 | + EXYNOS_4212_URSTCON_HOST_LINK_P1; + break; + }; + + if (on) { + writel(inst->clk_reg_val, drv->reg_phy + EXYNOS_4212_UPHYCLK); + + pwr = readl(drv->reg_phy + EXYNOS_4212_UPHYPWR); + pwr &= ~phypwr; + writel(pwr, drv->reg_phy + EXYNOS_4212_UPHYPWR); + + rst = readl(drv->reg_phy + EXYNOS_4212_UPHYRST); + rst |= rstbits; + writel(rst, drv->reg_phy + EXYNOS_4212_UPHYRST); + udelay(10); + rst &= ~rstbits; + writel(rst, drv->reg_phy + EXYNOS_4212_UPHYRST); + } else { + pwr = readl(drv->reg_phy + EXYNOS_4212_UPHYPWR); + pwr |= phypwr; + writel(pwr, drv->reg_phy + EXYNOS_4212_UPHYPWR); + } +} + +static int exynos4212_power_on(struct samsung_usb2_phy_instance *inst) +{ + struct samsung_usb2_phy_driver *drv = inst->drv; + + inst->enabled = 1; + exynos4212_phy_pwr(inst, 1); + exynos4212_isol(inst, 0); + + /* Power on the device, as it is necessary for HSIC to work */ + if (inst->cfg->id == EXYNOS4212_HSIC0) { + struct samsung_usb2_phy_instance *device = + &drv->instances[EXYNOS4212_DEVICE]; + exynos4212_phy_pwr(device, 1); + exynos4212_isol(device, 0); + } + + return 0; +} + +static int exynos4212_power_off(struct samsung_usb2_phy_instance *inst) +{ + struct samsung_usb2_phy_driver *drv = inst->drv; + struct samsung_usb2_phy_instance *device = &drv->instances[EXYNOS4212_DEVICE]; + + inst->enabled = 0; + exynos4212_isol(inst, 1); + exynos4212_phy_pwr(inst, 0); + + if (inst->cfg->id == EXYNOS4212_HSIC0 && !device->enabled) { + exynos4212_isol(device, 1); + exynos4212_phy_pwr(device, 0); + } + + return 0; +} + + +static const struct samsung_usb2_common_phy exynos4212_phys[] = { + { + .label = "device", + .id = EXYNOS4212_DEVICE, + .rate_to_clk = exynos4212_rate_to_clk, + .power_on = exynos4212_power_on, + .power_off = exynos4212_power_off, + }, + { + .label = "host", + .id = EXYNOS4212_HOST, + .rate_to_clk = exynos4212_rate_to_clk, + .power_on = exynos4212_power_on, + .power_off = exynos4212_power_off, + }, + { + .label = "hsic0", + .id = EXYNOS4212_HSIC0, + .rate_to_clk = exynos4212_rate_to_clk, + .power_on = exynos4212_power_on, + .power_off = exynos4212_power_off, + }, + { + .label = "hsic1", + .id = EXYNOS4212_HSIC1, + .rate_to_clk = exynos4212_rate_to_clk, + .power_on = exynos4212_power_on, + .power_off = exynos4212_power_off, + }, + {}, +}; + +const struct samsung_usb2_phy_config exynos4212_usb2_phy_config = { + .num_phys = EXYNOS4212_NUM_PHYS, + .phys = exynos4212_phys, + .has_mode_switch = 1, +}; + diff --git a/drivers/phy/phy-samsung-usb2.c b/drivers/phy/phy-samsung-usb2.c new file mode 100644 index 0000000..804ec77 --- /dev/null +++ b/drivers/phy/phy-samsung-usb2.c @@ -0,0 +1,228 @@ +/* + * Samsung SoC USB 1.1/2.0 PHY driver + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * Author: Kamil Debski <k.debski@xxxxxxxxxxx> + * + * 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/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> +#include "phy-samsung-usb2.h" + +static int samsung_usb2_phy_power_on(struct phy *phy) +{ + struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy); + struct samsung_usb2_phy_driver *drv = inst->drv; + int ret; + + dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n", + inst->cfg->label); + ret = clk_prepare_enable(drv->clk); + if (ret) + goto err_main_clk; + ret = clk_prepare_enable(inst->clk); + if (ret) + goto err_instance_clk; + inst->rate = clk_get_rate(inst->clk); + if (inst->cfg->rate_to_clk) { + ret = inst->cfg->rate_to_clk(inst->rate, &inst->clk_reg_val); + if (ret) + goto err_get_rate; + } + if (inst->cfg->power_on) { + spin_lock(&drv->lock); + ret = inst->cfg->power_on(inst); + spin_unlock(&drv->lock); + } + + return 0; + +err_get_rate: + clk_disable_unprepare(inst->clk); +err_instance_clk: + clk_disable_unprepare(drv->clk); +err_main_clk: + return ret; +} + +static int samsung_usb2_phy_power_off(struct phy *phy) +{ + struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy); + struct samsung_usb2_phy_driver *drv = inst->drv; + int ret = 0; + + dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n", + inst->cfg->label); + if (inst->cfg->power_off) { + spin_lock(&drv->lock); + ret = inst->cfg->power_off(inst); + spin_unlock(&drv->lock); + } + clk_disable_unprepare(inst->clk); + clk_disable_unprepare(drv->clk); + return ret; +} + +static struct phy_ops samsung_usb2_phy_ops = { + .power_on = samsung_usb2_phy_power_on, + .power_off = samsung_usb2_phy_power_off, + .owner = THIS_MODULE, +}; + +static struct phy *samsung_usb2_phy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct samsung_usb2_phy_driver *drv; + + drv = dev_get_drvdata(dev); + if (!drv) + return ERR_PTR(-EINVAL); + + if (WARN_ON(args->args[0] >= drv->cfg->num_phys)) + return ERR_PTR(-ENODEV); + + return drv->instances[args->args[0]].phy; +} + +static const struct of_device_id samsung_usb2_phy_of_match[] = { +#ifdef CONFIG_PHY_EXYNOS4210_USB2 + { + .compatible = "samsung,exynos4210-usb2-phy", + .data = &exynos4210_usb2_phy_config, + }, +#endif +#ifdef CONFIG_PHY_EXYNOS4212_USB2 + { + .compatible = "samsung,exynos4212-usb2-phy", + .data = &exynos4212_usb2_phy_config, + }, +#endif + { }, +}; + +static int samsung_usb2_phy_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + const struct samsung_usb2_phy_config *cfg; + struct clk *clk; + struct device *dev = &pdev->dev; + struct phy_provider *phy_provider; + struct resource *mem; + struct samsung_usb2_phy_driver *drv; + int i; + + if (!pdev->dev.of_node) { + dev_err(dev, "This driver is required to be instantiated from device tree\n"); + return -EINVAL; + } + + match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node); + if (!match) { + dev_err(dev, "of_match_node() failed\n"); + return -EINVAL; + } + cfg = match->data; + + drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) + + cfg->num_phys * sizeof(struct samsung_usb2_phy_instance), GFP_KERNEL); + if (!drv) + return -ENOMEM; + + dev_set_drvdata(dev, drv); + spin_lock_init(&drv->lock); + + drv->cfg = cfg; + drv->dev = dev; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + drv->reg_phy = devm_ioremap_resource(dev, mem); + if (IS_ERR(drv->reg_phy)) { + dev_err(dev, "Failed to map register memory (phy)\n"); + return PTR_ERR(drv->reg_phy); + } + + drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, + "samsung,pmureg-phandle"); + if (IS_ERR(drv->reg_pmu)) { + dev_err(dev, "Failed to map PMU registers (via syscon)\n"); + return PTR_ERR(drv->reg_pmu); + } + + if (drv->cfg->has_mode_switch) { + drv->reg_sys = syscon_regmap_lookup_by_phandle( + pdev->dev.of_node, "samsung,sysreg-phandle"); + if (IS_ERR(drv->reg_sys)) { + dev_err(dev, "Failed to map system registers (via syscon)\n"); + return PTR_ERR(drv->reg_sys); + } + } + + drv->clk = devm_clk_get(dev, "phy"); + if (IS_ERR(drv->clk)) { + dev_err(dev, "Failed to get clock of phy controller\n"); + return PTR_ERR(drv->clk); + } + + for (i = 0; i < drv->cfg->num_phys; i++) { + char *label = drv->cfg->phys[i].label; + struct samsung_usb2_phy_instance *p = &drv->instances[i]; + + dev_dbg(dev, "Creating phy \"%s\"\n", label); + p->phy = devm_phy_create(dev, &samsung_usb2_phy_ops, NULL); + if (IS_ERR(p->phy)) { + dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n", + label); + return PTR_ERR(p->phy); + } + + p->cfg = &drv->cfg->phys[i]; + p->drv = drv; + phy_set_drvdata(p->phy, p); + + clk = devm_clk_get(dev, p->cfg->label); + if (IS_ERR(clk)) { + dev_err(dev, "Failed to get clock of \"%s\" phy\n", + p->cfg->label); + return PTR_ERR(clk); + } + p->clk = clk; + } + + phy_provider = devm_of_phy_provider_register(dev, + samsung_usb2_phy_xlate); + if (IS_ERR(phy_provider)) { + dev_err(drv->dev, "Failed to register phy provider\n"); + return PTR_ERR(phy_provider); + } + + return 0; +} + +static struct platform_driver samsung_usb2_phy_driver = { + .probe = samsung_usb2_phy_probe, + .driver = { + .of_match_table = samsung_usb2_phy_of_match, + .name = "samsung-usb2-phy", + .owner = THIS_MODULE, + } +}; + +module_platform_driver(samsung_usb2_phy_driver); +MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver"); +MODULE_AUTHOR("Kamil Debski <k.debski@xxxxxxxxxxx>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:samsung-usb2-phy"); + diff --git a/drivers/phy/phy-samsung-usb2.h b/drivers/phy/phy-samsung-usb2.h new file mode 100644 index 0000000..cd12477 --- /dev/null +++ b/drivers/phy/phy-samsung-usb2.h @@ -0,0 +1,72 @@ +/* + * Samsung SoC USB 1.1/2.0 PHY driver + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * Author: Kamil Debski <k.debski@xxxxxxxxxxx> + * + * 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. + */ + +#ifndef _PHY_EXYNOS_USB2_H +#define _PHY_EXYNOS_USB2_H + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> + +#define KHZ 1000 +#define MHZ (KHZ * KHZ) + +struct samsung_usb2_phy_driver; +struct samsung_usb2_phy_instance; +struct samsung_usb2_phy_config; + +struct samsung_usb2_phy_instance { + struct samsung_usb2_phy_driver *drv; + struct phy *phy; + const struct samsung_usb2_common_phy *cfg; + char enabled; + struct clk *clk; + u32 clk_reg_val; + unsigned long rate; +}; + +struct samsung_usb2_phy_driver { + struct device *dev; + spinlock_t lock; + void __iomem *reg_phy; + struct regmap *reg_sys; + struct regmap *reg_pmu; + const struct samsung_usb2_phy_config *cfg; + struct clk *clk; + struct samsung_usb2_phy_instance instances[0]; +}; + +struct samsung_usb2_common_phy { + char *label; + unsigned int id; + int (*rate_to_clk)(unsigned long, u32 *); + int (*power_on)(struct samsung_usb2_phy_instance *); + int (*power_off)(struct samsung_usb2_phy_instance *); +}; + + +struct samsung_usb2_phy_config { + int num_phys; + const struct samsung_usb2_common_phy *phys; + char has_mode_switch; +}; + +extern const struct samsung_usb2_phy_config exynos4210_usb2_phy_config; +extern const struct samsung_usb2_phy_config exynos4212_usb2_phy_config; +#endif + -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html