[PATCH] USB: phy: add ralink SoC driver

[John Crispin]

RT3352, RT5350 and the MT762x SoCs all have a usb phy that we need to setup.

Signed-off-by: John Crispin <***@openwrt.org>
---
drivers/usb/phy/Kconfig | 8 ++
drivers/usb/phy/Makefile | 1 +
drivers/usb/phy/phy-ralink.c | 192 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 201 insertions(+)
create mode 100644 drivers/usb/phy/phy-ralink.c

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index e253fa0..ba0ef3a 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -215,6 +215,14 @@ config USB_RCAR_GEN2_PHY
To compile this driver as a module, choose M here: the
module will be called phy-rcar-gen2-usb.

+config USB_RALINK_PHY
+ bool "Ralink USB PHY controller Driver"
+ depends on MIPS && RALINK
+ select USB_PHY
+ help
+ Enable this to support ralink USB phy controller for ralink
+ SoCs.
+
config USB_ULPI
bool "Generic ULPI Transceiver Driver"
depends on ARM || ARM64
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 24a9133..1bebfc5 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_USB_ISP1301) += phy-isp1301.o
obj-$(CONFIG_USB_MSM_OTG) += phy-msm-usb.o
obj-$(CONFIG_USB_MV_OTG) += phy-mv-usb.o
obj-$(CONFIG_USB_MXS_PHY) += phy-mxs-usb.o
+obj-$(CONFIG_USB_RALINK_PHY) += phy-ralink.o
obj-$(CONFIG_USB_RCAR_PHY) += phy-rcar-usb.o
obj-$(CONFIG_USB_RCAR_GEN2_PHY) += phy-rcar-gen2-usb.o
obj-$(CONFIG_USB_ULPI) += phy-ulpi.o
diff --git a/drivers/usb/phy/phy-ralink.c b/drivers/usb/phy/phy-ralink.c
new file mode 100644
index 0000000..c54b2a8
--- /dev/null
+++ b/drivers/usb/phy/phy-ralink.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2013 John Crispin <***@openwrt.org>
+ *
+ * based on: Renesas R-Car USB phy driver
+ *
+ * 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/usb/otg.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/reset.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define RT_SYSC_REG_SYSCFG1 0x014
+#define RT_SYSC_REG_CLKCFG1 0x030
+#define RT_SYSC_REG_USB_PHY_CFG 0x05c
+
+#define RT_RSTCTRL_UDEV BIT(25)
+#define RT_RSTCTRL_UHST BIT(22)
+#define RT_SYSCFG1_USB0_HOST_MODE BIT(10)
+
+#define MT7620_CLKCFG1_UPHY0_CLK_EN BIT(25)
+#define MT7620_CLKCFG1_UPHY1_CLK_EN BIT(22)
+#define RT_CLKCFG1_UPHY1_CLK_EN BIT(20)
+#define RT_CLKCFG1_UPHY0_CLK_EN BIT(18)
+
+#define USB_PHY_UTMI_8B60M BIT(1)
+#define UDEV_WAKEUP BIT(0)
+
+static atomic_t usb_pwr_ref = ATOMIC_INIT(0);
+static struct reset_control *rstdev;
+static struct reset_control *rsthost;
+static u32 phy_clk;
+
+static void usb_phy_enable(int state)
+{
+ if (state)
+ rt_sysc_m32(0, phy_clk, RT_SYSC_REG_CLKCFG1);
+ else
+ rt_sysc_m32(phy_clk, 0, RT_SYSC_REG_CLKCFG1);
+ mdelay(100);
+}
+
+static int usb_power_on(struct usb_phy *phy)
+{
+ if (atomic_inc_return(&usb_pwr_ref) == 1) {
+ u32 t;
+
+ usb_phy_enable(1);
+
+ if (OTG_STATE_B_HOST) {
+ rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE,
+ RT_SYSC_REG_SYSCFG1);
+ if (!IS_ERR(rsthost))
+ reset_control_deassert(rsthost);
+ } else {
+ rt_sysc_m32(RT_SYSCFG1_USB0_HOST_MODE, 0,
+ RT_SYSC_REG_SYSCFG1);
+ if (!IS_ERR(rstdev))
+ reset_control_deassert(rstdev);
+ }
+ mdelay(100);
+
+ t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG);
+ dev_info(phy->dev, "remote usb device wakeup %s\n",
+ (t & UDEV_WAKEUP) ? "enabled" : "disabled");
+ if (t & USB_PHY_UTMI_8B60M)
+ dev_info(phy->dev, "UTMI 8bit 60MHz\n");
+ else
+ dev_info(phy->dev, "UTMI 16bit 30MHz\n");
+ }
+
+ return 0;
+}
+
+static void usb_power_off(struct usb_phy *phy)
+{
+ if (atomic_dec_return(&usb_pwr_ref) == 0) {
+ usb_phy_enable(0);
+ if (!IS_ERR(rstdev))
+ reset_control_assert(rstdev);
+ if (!IS_ERR(rsthost))
+ reset_control_assert(rsthost);
+ }
+}
+
+static int usb_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+ otg->gadget = NULL;
+ otg->host = host;
+
+ return 0;
+}
+
+static int usb_set_peripheral(struct usb_otg *otg,
+ struct usb_gadget *gadget)
+{
+ otg->host = NULL;
+ otg->gadget = gadget;
+
+ return 0;
+}
+
+static const struct of_device_id ralink_usbphy_dt_match[] = {
+ {
+ .compatible = "ralink,rt3xxx-usbphy",
+ .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN |
+ RT_CLKCFG1_UPHY0_CLK_EN)
+ }, {
+ .compatible = "ralink,mt7620a-usbphy",
+ .data = (void *) (MT7620_CLKCFG1_UPHY1_CLK_EN |
+ MT7620_CLKCFG1_UPHY0_CLK_EN)
+ }, {},
+};
+MODULE_DEVICE_TABLE(of, ralink_usbphy_dt_match);
+
+static int usb_phy_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct device *dev = &pdev->dev;
+ struct usb_otg *otg;
+ struct usb_phy *phy;
+ int ret;
+
+ match = of_match_device(ralink_usbphy_dt_match, &pdev->dev);
+ phy_clk = (int) match->data;
+
+ rsthost = devm_reset_control_get(&pdev->dev, "host");
+ rstdev = devm_reset_control_get(&pdev->dev, "device");
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
+ if (!otg)
+ return -ENOMEM;
+
+ phy->dev = dev;
+ phy->label = dev_name(dev);
+ phy->init = usb_power_on;
+ phy->shutdown = usb_power_off;
+ otg->set_host = usb_set_host;
+ otg->set_peripheral = usb_set_peripheral;
+ otg->phy = phy;
+ phy->otg = otg;
+ ret = usb_add_phy(phy, USB_PHY_TYPE_USB2);
+
+ if (ret < 0) {
+ dev_err(dev, "usb phy addition error\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, phy);
+
+ dev_info(&pdev->dev, "loaded\n");
+
+ return ret;
+}
+
+static int usb_phy_remove(struct platform_device *pdev)
+{
+ struct usb_phy *phy = platform_get_drvdata(pdev);
+
+ usb_remove_phy(phy);
+
+ return 0;
+}
+
+static struct platform_driver usb_phy_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "rt3xxx-usbphy",
+ .of_match_table = of_match_ptr(ralink_usbphy_dt_match),
+ },
+ .probe = usb_phy_probe,
+ .remove = usb_phy_remove,
+};
+
+module_platform_driver(usb_phy_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Ralink USB phy");
+MODULE_AUTHOR("John Crispin <***@openwrt.org>");

[Felipe Balbi]

Post by John Crispin
RT3352, RT5350 and the MT762x SoCs all have a usb phy that we need to setup.

new PHY drivers only on drivers/phy ;-)

[John Crispin]

Post by Felipe Balbi

Post by John Crispin
RT3352, RT5350 and the MT762x SoCs all have a usb phy that we need to setup.

new PHY drivers only on drivers/phy ;-)

i that hope i am not the first to get it wrong. I will prepare/send a
fixed version.

John
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[Felipe Balbi]

Post by John Crispin

Post by Felipe Balbi

Post by John Crispin
RT3352, RT5350 and the MT762x SoCs all have a usb phy that we need to setup.

new PHY drivers only on drivers/phy ;-)

i that hope i am not the first to get it wrong. I will prepare/send a
fixed version.

of course not, happens all the time :-) We're still transitioning things
over.

Thanks