linux/drivers/usb/phy/phy-am335x-control.c
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   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/module.h>
   3#include <linux/platform_device.h>
   4#include <linux/err.h>
   5#include <linux/of.h>
   6#include <linux/io.h>
   7#include <linux/delay.h>
   8#include <linux/usb/otg.h>
   9#include "phy-am335x-control.h"
  10
  11struct am335x_control_usb {
  12        struct device *dev;
  13        void __iomem *phy_reg;
  14        void __iomem *wkup;
  15        spinlock_t lock;
  16        struct phy_control phy_ctrl;
  17};
  18
  19#define AM335X_USB0_CTRL                0x0
  20#define AM335X_USB1_CTRL                0x8
  21#define AM335x_USB_WKUP                 0x0
  22
  23#define USBPHY_CM_PWRDN         (1 << 0)
  24#define USBPHY_OTG_PWRDN        (1 << 1)
  25#define USBPHY_OTGVDET_EN       (1 << 19)
  26#define USBPHY_OTGSESSEND_EN    (1 << 20)
  27
  28#define AM335X_PHY0_WK_EN       (1 << 0)
  29#define AM335X_PHY1_WK_EN       (1 << 8)
  30
  31static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
  32{
  33        struct am335x_control_usb *usb_ctrl;
  34        u32 val;
  35        u32 reg;
  36
  37        usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  38
  39        switch (id) {
  40        case 0:
  41                reg = AM335X_PHY0_WK_EN;
  42                break;
  43        case 1:
  44                reg = AM335X_PHY1_WK_EN;
  45                break;
  46        default:
  47                WARN_ON(1);
  48                return;
  49        }
  50
  51        spin_lock(&usb_ctrl->lock);
  52        val = readl(usb_ctrl->wkup);
  53
  54        if (on)
  55                val |= reg;
  56        else
  57                val &= ~reg;
  58
  59        writel(val, usb_ctrl->wkup);
  60        spin_unlock(&usb_ctrl->lock);
  61}
  62
  63static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
  64                                enum usb_dr_mode dr_mode, bool on)
  65{
  66        struct am335x_control_usb *usb_ctrl;
  67        u32 val;
  68        u32 reg;
  69
  70        usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  71
  72        switch (id) {
  73        case 0:
  74                reg = AM335X_USB0_CTRL;
  75                break;
  76        case 1:
  77                reg = AM335X_USB1_CTRL;
  78                break;
  79        default:
  80                WARN_ON(1);
  81                return;
  82        }
  83
  84        val = readl(usb_ctrl->phy_reg + reg);
  85        if (on) {
  86                if (dr_mode == USB_DR_MODE_HOST) {
  87                        val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
  88                                        USBPHY_OTGVDET_EN);
  89                        val |= USBPHY_OTGSESSEND_EN;
  90                } else {
  91                        val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
  92                        val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
  93                }
  94        } else {
  95                val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
  96        }
  97
  98        writel(val, usb_ctrl->phy_reg + reg);
  99
 100        /*
 101         * Give the PHY ~1ms to complete the power up operation.
 102         * Tests have shown unstable behaviour if other USB PHY related
 103         * registers are written too shortly after such a transition.
 104         */
 105        if (on)
 106                mdelay(1);
 107}
 108
 109static const struct phy_control ctrl_am335x = {
 110        .phy_power = am335x_phy_power,
 111        .phy_wkup = am335x_phy_wkup,
 112};
 113
 114static const struct of_device_id omap_control_usb_id_table[] = {
 115        { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
 116        {}
 117};
 118MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
 119
 120static struct platform_driver am335x_control_driver;
 121static int match(struct device *dev, const void *data)
 122{
 123        const struct device_node *node = (const struct device_node *)data;
 124        return dev->of_node == node &&
 125                dev->driver == &am335x_control_driver.driver;
 126}
 127
 128struct phy_control *am335x_get_phy_control(struct device *dev)
 129{
 130        struct device_node *node;
 131        struct am335x_control_usb *ctrl_usb;
 132
 133        node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
 134        if (!node)
 135                return NULL;
 136
 137        dev = bus_find_device(&platform_bus_type, NULL, node, match);
 138        of_node_put(node);
 139        if (!dev)
 140                return NULL;
 141
 142        ctrl_usb = dev_get_drvdata(dev);
 143        put_device(dev);
 144        if (!ctrl_usb)
 145                return NULL;
 146        return &ctrl_usb->phy_ctrl;
 147}
 148EXPORT_SYMBOL_GPL(am335x_get_phy_control);
 149
 150static int am335x_control_usb_probe(struct platform_device *pdev)
 151{
 152        struct resource *res;
 153        struct am335x_control_usb *ctrl_usb;
 154        const struct of_device_id *of_id;
 155        const struct phy_control *phy_ctrl;
 156
 157        of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
 158        if (!of_id)
 159                return -EINVAL;
 160
 161        phy_ctrl = of_id->data;
 162
 163        ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
 164        if (!ctrl_usb)
 165                return -ENOMEM;
 166
 167        ctrl_usb->dev = &pdev->dev;
 168
 169        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 170        ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
 171        if (IS_ERR(ctrl_usb->phy_reg))
 172                return PTR_ERR(ctrl_usb->phy_reg);
 173
 174        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
 175        ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
 176        if (IS_ERR(ctrl_usb->wkup))
 177                return PTR_ERR(ctrl_usb->wkup);
 178
 179        spin_lock_init(&ctrl_usb->lock);
 180        ctrl_usb->phy_ctrl = *phy_ctrl;
 181
 182        dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
 183        return 0;
 184}
 185
 186static struct platform_driver am335x_control_driver = {
 187        .probe          = am335x_control_usb_probe,
 188        .driver         = {
 189                .name   = "am335x-control-usb",
 190                .of_match_table = omap_control_usb_id_table,
 191        },
 192};
 193
 194module_platform_driver(am335x_control_driver);
 195MODULE_LICENSE("GPL v2");
 196