[PATCH v4 1/5] phy: Add driver to support individual USB PHYs on sun9i
Chen-Yu Tsai
wens at csie.org
Mon Feb 2 14:22:01 PST 2015
Unlike previous Allwinner SoCs, there is no central PHY control block
on the A80. Also, OTG support is completely split off into a different
controller.
This adds a new driver to support the regular USB PHYs.
Signed-off-by: Chen-Yu Tsai <wens at csie.org>
Acked-by: Maxime Ripard <maxime.ripard at free-electrons.com>
---
.../devicetree/bindings/phy/sun9i-usb-phy.txt | 34 +++
drivers/phy/Kconfig | 12 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-sun9i-usb.c | 238 +++++++++++++++++++++
4 files changed, 285 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt
create mode 100644 drivers/phy/phy-sun9i-usb.c
diff --git a/Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt
new file mode 100644
index 000000000000..af40dd2fe0eb
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt
@@ -0,0 +1,34 @@
+Allwinner sun9i USB PHY
+-----------------------
+
+Required properties:
+- compatible : should be one of
+ * allwinner,sun9i-a80-usb-phy
+- reg : a list of offset + length pairs
+- #phy-cells : from the generic phy bindings, must be 0
+- phy_type : "hsic" for HSIC usage;
+ other values or absence of this property indicates normal USB
+- clocks : phandle + clock specifier for the phy clocks
+- clock-names : depending on the "phy_type" property,
+ * "phy" for normal USB
+ * "hsic_480M", "hsic_12M" for HSIC
+- resets : a list of phandle + reset specifier pairs
+- reset-names : depending on the "phy_type" property,
+ * "phy" for normal USB
+ * "hsic" for HSIC
+
+It is recommended to list all clocks and resets available.
+The driver will only use those matching the phy_type.
+
+Example:
+ usbphy1: phy at 00a01800 {
+ compatible = "allwinner,sun9i-a80-usb-phy";
+ reg = <0x00a01800 0x4>;
+ clocks = <&usb_phy_clk 2>, <&usb_phy_clk 10>,
+ <&usb_phy_clk 3>;
+ clock-names = "hsic_480M", "hsic_12M", "phy";
+ resets = <&usb_phy_clk 18>, <&usb_phy_clk 19>;
+ reset-names = "hsic", "phy";
+ status = "disabled";
+ #phy-cells = <0>;
+ };
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index ccad8809ecb1..4c280b28a2ce 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -174,6 +174,18 @@ config PHY_SUN4I_USB
This driver controls the entire USB PHY block, both the USB OTG
parts, as well as the 2 regular USB 2 host PHYs.
+config PHY_SUN9I_USB
+ tristate "Allwinner sun9i SoC USB PHY driver"
+ depends on ARCH_SUNXI && HAS_IOMEM && OF
+ depends on RESET_CONTROLLER
+ select USB_PHY
+ select GENERIC_PHY
+ help
+ Enable this to support the transceiver that is part of Allwinner
+ sun9i SoCs.
+
+ This driver controls each individual USB 2 host PHY.
+
config PHY_SAMSUNG_USB2
tristate "Samsung USB 2.0 PHY driver"
depends on HAS_IOMEM
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index aa74f961e44e..11ead804d9a4 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o
obj-$(CONFIG_PHY_EXYNOS5250_SATA) += phy-exynos5250-sata.o
obj-$(CONFIG_PHY_HIX5HD2_SATA) += phy-hix5hd2-sata.o
obj-$(CONFIG_PHY_SUN4I_USB) += phy-sun4i-usb.o
+obj-$(CONFIG_PHY_SUN9I_USB) += phy-sun9i-usb.o
obj-$(CONFIG_PHY_SAMSUNG_USB2) += phy-exynos-usb2.o
phy-exynos-usb2-y += phy-samsung-usb2.o
phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4210_USB2) += phy-exynos4210-usb2.o
diff --git a/drivers/phy/phy-sun9i-usb.c b/drivers/phy/phy-sun9i-usb.c
new file mode 100644
index 000000000000..0fddd56df38c
--- /dev/null
+++ b/drivers/phy/phy-sun9i-usb.c
@@ -0,0 +1,238 @@
+/*
+ * Allwinner sun9i USB phy driver
+ *
+ * Copyright (C) 2014 Chen-Yu Tsai <wens at csie.org>
+ *
+ * Based on phy-sun4i-usb.c from
+ * Hans de Goede <hdegoede at redhat.com>
+ *
+ * and code from
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/usb/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#define SUNXI_AHB_INCR16_BURST_EN BIT(11)
+#define SUNXI_AHB_INCR8_BURST_EN BIT(10)
+#define SUNXI_AHB_INCR4_BURST_EN BIT(9)
+#define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)
+#define SUNXI_ULPI_BYPASS_EN BIT(0)
+
+/* usb1 HSIC specific bits */
+#define SUNXI_EHCI_HS_FORCE BIT(20)
+#define SUNXI_HSIC_CONNECT_DET BIT(17)
+#define SUNXI_HSIC_CONNECT_INT BIT(16)
+#define SUNXI_HSIC BIT(1)
+
+struct sun9i_usb_phy {
+ struct phy *phy;
+ void __iomem *pmu;
+ struct regulator *vbus;
+ struct reset_control *reset;
+ struct clk *clk;
+ struct clk *hsic_clk;
+ enum usb_phy_interface type;
+};
+
+static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)
+{
+ u32 bits, reg_value;
+
+ bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |
+ SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |
+ SUNXI_ULPI_BYPASS_EN;
+
+ if (phy->type == USBPHY_INTERFACE_MODE_HSIC)
+ bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |
+ SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;
+
+ reg_value = readl(phy->pmu);
+
+ if (enable)
+ reg_value |= bits;
+ else
+ reg_value &= ~bits;
+
+ writel(reg_value, phy->pmu);
+}
+
+static int sun9i_usb_phy_init(struct phy *_phy)
+{
+ struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
+ int ret;
+
+ ret = clk_prepare_enable(phy->clk);
+ if (ret)
+ goto err_clk;
+
+ ret = clk_prepare_enable(phy->hsic_clk);
+ if (ret)
+ goto err_hsic_clk;
+
+ ret = reset_control_deassert(phy->reset);
+ if (ret)
+ goto err_reset;
+
+ sun9i_usb_phy_passby(phy, 1);
+ return 0;
+
+err_reset:
+ clk_disable_unprepare(phy->hsic_clk);
+
+err_hsic_clk:
+ clk_disable_unprepare(phy->clk);
+
+err_clk:
+ return ret;
+}
+
+static int sun9i_usb_phy_exit(struct phy *_phy)
+{
+ struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
+
+ sun9i_usb_phy_passby(phy, 0);
+ reset_control_assert(phy->reset);
+ clk_disable_unprepare(phy->hsic_clk);
+ clk_disable_unprepare(phy->clk);
+
+ return 0;
+}
+
+static int sun9i_usb_phy_power_on(struct phy *_phy)
+{
+ struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
+ int ret = 0;
+
+ if (phy->vbus)
+ ret = regulator_enable(phy->vbus);
+
+ return ret;
+}
+
+static int sun9i_usb_phy_power_off(struct phy *_phy)
+{
+ struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
+
+ if (phy->vbus)
+ regulator_disable(phy->vbus);
+
+ return 0;
+}
+
+static struct phy_ops sun9i_usb_phy_ops = {
+ .init = sun9i_usb_phy_init,
+ .exit = sun9i_usb_phy_exit,
+ .power_on = sun9i_usb_phy_power_on,
+ .power_off = sun9i_usb_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int sun9i_usb_phy_probe(struct platform_device *pdev)
+{
+ struct sun9i_usb_phy *phy;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct phy_provider *phy_provider;
+ struct resource *res;
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->vbus = devm_regulator_get_optional(dev, "vbus");
+ if (IS_ERR(phy->vbus)) {
+ if (PTR_ERR(phy->vbus) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ phy->vbus = NULL;
+ }
+
+ phy->type = of_usb_get_phy_mode(np);
+ if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
+ phy->clk = devm_clk_get(dev, "hsic_480M");
+ if (IS_ERR(phy->clk)) {
+ dev_err(dev, "failed to get hsic_480M clock\n");
+ return PTR_ERR(phy->clk);
+ }
+
+ phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
+ if (IS_ERR(phy->clk)) {
+ dev_err(dev, "failed to get hsic_12M clock\n");
+ return PTR_ERR(phy->clk);
+ }
+
+ phy->reset = devm_reset_control_get(dev, "hsic");
+ if (IS_ERR(phy->reset)) {
+ dev_err(dev, "failed to get reset control\n");
+ return PTR_ERR(phy->reset);
+ }
+ } else {
+ phy->clk = devm_clk_get(dev, "phy");
+ if (IS_ERR(phy->clk)) {
+ dev_err(dev, "failed to get phy clock\n");
+ return PTR_ERR(phy->clk);
+ }
+
+ phy->reset = devm_reset_control_get(dev, "phy");
+ if (IS_ERR(phy->reset)) {
+ dev_err(dev, "failed to get reset control\n");
+ return PTR_ERR(phy->reset);
+ }
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ phy->pmu = devm_ioremap_resource(dev, res);
+ if (IS_ERR(phy->pmu))
+ return PTR_ERR(phy->pmu);
+
+ phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
+ if (IS_ERR(phy->phy)) {
+ dev_err(dev, "failed to create PHY\n");
+ return PTR_ERR(phy->phy);
+ }
+
+ phy_set_drvdata(phy->phy, phy);
+ dev_set_drvdata(dev, phy);
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id sun9i_usb_phy_of_match[] = {
+ { .compatible = "allwinner,sun9i-a80-usb-phy" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
+
+static struct platform_driver sun9i_usb_phy_driver = {
+ .probe = sun9i_usb_phy_probe,
+ .driver = {
+ .of_match_table = sun9i_usb_phy_of_match,
+ .name = "sun9i-usb-phy",
+ }
+};
+module_platform_driver(sun9i_usb_phy_driver);
+
+MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
+MODULE_AUTHOR("Chen-Yu Tsai <wens at csie.org>");
+MODULE_LICENSE("GPL v2");
--
2.1.4
More information about the linux-arm-kernel
mailing list