[PATCH 07/19] phy: Add support for S5PV210 to the Exynos USB 2.0 PHY driver

Tomasz Figa
2014-07-04T17:48:07Z

From: Mateusz Krawczuk <mat.krawczuk@gmail.com>

Add support for the Samsung's S5PV210 SoC to the Exynos USB 2.0 PHY driver.

Signed-off-by: Mateusz Krawczuk <m.krawczuk@partner.samsung.com>
[k.debski at samsung.com: cleanup and commit description]
[k.debski at samsung.com: make changes accordingly to the mailing list
comments]
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mateusz Krawczuk <mat.krawczuk@gmail.com>
[t.figa: rebased, fixed merge errors, neatened]
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree at vger.kernel.org
---
.../devicetree/bindings/phy/samsung-phy.txt | 1 +
drivers/phy/Kconfig | 10 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-s5pv210-usb2.c | 187 +++++++++++++++++++++
drivers/phy/phy-samsung-usb2.c | 6 +
drivers/phy/phy-samsung-usb2.h | 1 +
6 files changed, 206 insertions(+)
create mode 100644 drivers/phy/phy-s5pv210-usb2.c

diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
index 2049261..7dce043 100644
--- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
+++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
@@ -26,6 +26,7 @@ Samsung S5P/EXYNOS SoC series USB PHY

Required properties:
- compatible : should be one of the listed compatibles:
+ - "samsung,s5pv210-usb2-phy"
- "samsung,exynos4210-usb2-phy"
- "samsung,exynos4x12-usb2-phy"
- "samsung,exynos5250-usb2-phy"
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 16a2f06..7153361 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -130,6 +130,16 @@ config PHY_SAMSUNG_USB2
particular SoCs has to be enabled in addition to this driver. Number
and type of supported phys depends on the SoC.

+config PHY_S5PV210_USB2
+ bool "Support for S5PV210"
+ depends on PHY_SAMSUNG_USB2
+ depends on ARCH_S5PV210
+ help
+ Enable USB PHY support for S5PV210. This option requires that Samsung
+ USB 2.0 PHY driver is enabled and means that support for this
+ particular SoC is compiled in the driver. In case of S5PV210 two phys
+ are available - device and host.
+
config PHY_EXYNOS4210_USB2
bool "Support for Exynos 4210"
depends on PHY_SAMSUNG_USB2
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index b4f1d57..2983808 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -18,5 +18,6 @@ phy-exynos-usb2-y += phy-samsung-usb2.o
phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4210_USB2) += phy-exynos4210-usb2.o
phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4X12_USB2) += phy-exynos4x12-usb2.o
phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2) += phy-exynos5250-usb2.o
+phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2) += phy-s5pv210-usb2.o
obj-$(CONFIG_PHY_EXYNOS5_USBDRD) += phy-exynos5-usbdrd.o
obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
diff --git a/drivers/phy/phy-s5pv210-usb2.c b/drivers/phy/phy-s5pv210-usb2.c
new file mode 100644
index 0000000..004d320
--- /dev/null
+++ b/drivers/phy/phy-s5pv210-usb2.c
@@ -0,0 +1,187 @@
+/*
+ * 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,
+};
diff --git a/drivers/phy/phy-samsung-usb2.c b/drivers/phy/phy-samsung-usb2.c
index 8a8c6bc..6d7439c 100644
--- a/drivers/phy/phy-samsung-usb2.c
+++ b/drivers/phy/phy-samsung-usb2.c
@@ -87,6 +87,12 @@ static struct phy *samsung_usb2_phy_xlate(struct device *dev,
}

static const struct of_device_id samsung_usb2_phy_of_match[] = {
+#ifdef CONFIG_PHY_S5PV210_USB2
+ {
+ .compatible = "samsung,s5pv210-usb2-phy",
+ .data = &s5pv210_usb2_phy_config,
+ },
+#endif
#ifdef CONFIG_PHY_EXYNOS4210_USB2
{
.compatible = "samsung,exynos4210-usb2-phy",
diff --git a/drivers/phy/phy-samsung-usb2.h b/drivers/phy/phy-samsung-usb2.h
index 45b3170..1c55795 100644
--- a/drivers/phy/phy-samsung-usb2.h
+++ b/drivers/phy/phy-samsung-usb2.h
@@ -61,6 +61,7 @@ struct samsung_usb2_phy_config {
bool has_mode_switch;
};

+extern const struct samsung_usb2_phy_config s5pv210_usb2_phy_config;
extern const struct samsung_usb2_phy_config exynos4210_usb2_phy_config;
extern const struct samsung_usb2_phy_config exynos4x12_usb2_phy_config;
extern const struct samsung_usb2_phy_config exynos5250_usb2_phy_config;
--
1.9.3