| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Renesas R-Car Gen2 PHY driver |
| * |
| * Copyright (C) 2014 Renesas Solutions Corp. |
| * Copyright (C) 2014 Cogent Embedded, Inc. |
| * Copyright (C) 2019 Renesas Electronics Corp. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/phy/phy.h> |
| #include <linux/platform_device.h> |
| #include <linux/spinlock.h> |
| #include <linux/atomic.h> |
| #include <linux/of_device.h> |
| |
| #define USBHS_LPSTS 0x02 |
| #define USBHS_UGCTRL 0x80 |
| #define USBHS_UGCTRL2 0x84 |
| #define USBHS_UGSTS 0x88 /* From technical update */ |
| |
| /* Low Power Status register (LPSTS) */ |
| #define USBHS_LPSTS_SUSPM 0x4000 |
| |
| /* USB General control register (UGCTRL) */ |
| #define USBHS_UGCTRL_CONNECT 0x00000004 |
| #define USBHS_UGCTRL_PLLRESET 0x00000001 |
| |
| /* USB General control register 2 (UGCTRL2) */ |
| #define USBHS_UGCTRL2_USB2SEL 0x80000000 |
| #define USBHS_UGCTRL2_USB2SEL_PCI 0x00000000 |
| #define USBHS_UGCTRL2_USB2SEL_USB30 0x80000000 |
| #define USBHS_UGCTRL2_USB0SEL 0x00000030 |
| #define USBHS_UGCTRL2_USB0SEL_PCI 0x00000010 |
| #define USBHS_UGCTRL2_USB0SEL_HS_USB 0x00000030 |
| #define USBHS_UGCTRL2_USB0SEL_USB20 0x00000010 |
| #define USBHS_UGCTRL2_USB0SEL_HS_USB20 0x00000020 |
| |
| /* USB General status register (UGSTS) */ |
| #define USBHS_UGSTS_LOCK 0x00000100 /* From technical update */ |
| |
| #define PHYS_PER_CHANNEL 2 |
| |
| struct rcar_gen2_phy { |
| struct phy *phy; |
| struct rcar_gen2_channel *channel; |
| int number; |
| u32 select_value; |
| }; |
| |
| struct rcar_gen2_channel { |
| struct device_node *of_node; |
| struct rcar_gen2_phy_driver *drv; |
| struct rcar_gen2_phy phys[PHYS_PER_CHANNEL]; |
| int selected_phy; |
| u32 select_mask; |
| }; |
| |
| struct rcar_gen2_phy_driver { |
| void __iomem *base; |
| struct clk *clk; |
| spinlock_t lock; |
| int num_channels; |
| struct rcar_gen2_channel *channels; |
| }; |
| |
| struct rcar_gen2_phy_data { |
| const struct phy_ops *gen2_phy_ops; |
| const u32 (*select_value)[PHYS_PER_CHANNEL]; |
| }; |
| |
| static int rcar_gen2_phy_init(struct phy *p) |
| { |
| struct rcar_gen2_phy *phy = phy_get_drvdata(p); |
| struct rcar_gen2_channel *channel = phy->channel; |
| struct rcar_gen2_phy_driver *drv = channel->drv; |
| unsigned long flags; |
| u32 ugctrl2; |
| |
| /* |
| * Try to acquire exclusive access to PHY. The first driver calling |
| * phy_init() on a given channel wins, and all attempts to use another |
| * PHY on this channel will fail until phy_exit() is called by the first |
| * driver. Achieving this with cmpxcgh() should be SMP-safe. |
| */ |
| if (cmpxchg(&channel->selected_phy, -1, phy->number) != -1) |
| return -EBUSY; |
| |
| clk_prepare_enable(drv->clk); |
| |
| spin_lock_irqsave(&drv->lock, flags); |
| ugctrl2 = readl(drv->base + USBHS_UGCTRL2); |
| ugctrl2 &= ~channel->select_mask; |
| ugctrl2 |= phy->select_value; |
| writel(ugctrl2, drv->base + USBHS_UGCTRL2); |
| spin_unlock_irqrestore(&drv->lock, flags); |
| return 0; |
| } |
| |
| static int rcar_gen2_phy_exit(struct phy *p) |
| { |
| struct rcar_gen2_phy *phy = phy_get_drvdata(p); |
| struct rcar_gen2_channel *channel = phy->channel; |
| |
| clk_disable_unprepare(channel->drv->clk); |
| |
| channel->selected_phy = -1; |
| |
| return 0; |
| } |
| |
| static int rcar_gen2_phy_power_on(struct phy *p) |
| { |
| struct rcar_gen2_phy *phy = phy_get_drvdata(p); |
| struct rcar_gen2_phy_driver *drv = phy->channel->drv; |
| void __iomem *base = drv->base; |
| unsigned long flags; |
| u32 value; |
| int err = 0, i; |
| |
| /* Skip if it's not USBHS */ |
| if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB) |
| return 0; |
| |
| spin_lock_irqsave(&drv->lock, flags); |
| |
| /* Power on USBHS PHY */ |
| value = readl(base + USBHS_UGCTRL); |
| value &= ~USBHS_UGCTRL_PLLRESET; |
| writel(value, base + USBHS_UGCTRL); |
| |
| value = readw(base + USBHS_LPSTS); |
| value |= USBHS_LPSTS_SUSPM; |
| writew(value, base + USBHS_LPSTS); |
| |
| for (i = 0; i < 20; i++) { |
| value = readl(base + USBHS_UGSTS); |
| if ((value & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) { |
| value = readl(base + USBHS_UGCTRL); |
| value |= USBHS_UGCTRL_CONNECT; |
| writel(value, base + USBHS_UGCTRL); |
| goto out; |
| } |
| udelay(1); |
| } |
| |
| /* Timed out waiting for the PLL lock */ |
| err = -ETIMEDOUT; |
| |
| out: |
| spin_unlock_irqrestore(&drv->lock, flags); |
| |
| return err; |
| } |
| |
| static int rcar_gen2_phy_power_off(struct phy *p) |
| { |
| struct rcar_gen2_phy *phy = phy_get_drvdata(p); |
| struct rcar_gen2_phy_driver *drv = phy->channel->drv; |
| void __iomem *base = drv->base; |
| unsigned long flags; |
| u32 value; |
| |
| /* Skip if it's not USBHS */ |
| if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB) |
| return 0; |
| |
| spin_lock_irqsave(&drv->lock, flags); |
| |
| /* Power off USBHS PHY */ |
| value = readl(base + USBHS_UGCTRL); |
| value &= ~USBHS_UGCTRL_CONNECT; |
| writel(value, base + USBHS_UGCTRL); |
| |
| value = readw(base + USBHS_LPSTS); |
| value &= ~USBHS_LPSTS_SUSPM; |
| writew(value, base + USBHS_LPSTS); |
| |
| value = readl(base + USBHS_UGCTRL); |
| value |= USBHS_UGCTRL_PLLRESET; |
| writel(value, base + USBHS_UGCTRL); |
| |
| spin_unlock_irqrestore(&drv->lock, flags); |
| |
| return 0; |
| } |
| |
| static int rz_g1c_phy_power_on(struct phy *p) |
| { |
| struct rcar_gen2_phy *phy = phy_get_drvdata(p); |
| struct rcar_gen2_phy_driver *drv = phy->channel->drv; |
| void __iomem *base = drv->base; |
| unsigned long flags; |
| u32 value; |
| |
| spin_lock_irqsave(&drv->lock, flags); |
| |
| /* Power on USBHS PHY */ |
| value = readl(base + USBHS_UGCTRL); |
| value &= ~USBHS_UGCTRL_PLLRESET; |
| writel(value, base + USBHS_UGCTRL); |
| |
| /* As per the data sheet wait 340 micro sec for power stable */ |
| udelay(340); |
| |
| if (phy->select_value == USBHS_UGCTRL2_USB0SEL_HS_USB20) { |
| value = readw(base + USBHS_LPSTS); |
| value |= USBHS_LPSTS_SUSPM; |
| writew(value, base + USBHS_LPSTS); |
| } |
| |
| spin_unlock_irqrestore(&drv->lock, flags); |
| |
| return 0; |
| } |
| |
| static int rz_g1c_phy_power_off(struct phy *p) |
| { |
| struct rcar_gen2_phy *phy = phy_get_drvdata(p); |
| struct rcar_gen2_phy_driver *drv = phy->channel->drv; |
| void __iomem *base = drv->base; |
| unsigned long flags; |
| u32 value; |
| |
| spin_lock_irqsave(&drv->lock, flags); |
| /* Power off USBHS PHY */ |
| if (phy->select_value == USBHS_UGCTRL2_USB0SEL_HS_USB20) { |
| value = readw(base + USBHS_LPSTS); |
| value &= ~USBHS_LPSTS_SUSPM; |
| writew(value, base + USBHS_LPSTS); |
| } |
| |
| value = readl(base + USBHS_UGCTRL); |
| value |= USBHS_UGCTRL_PLLRESET; |
| writel(value, base + USBHS_UGCTRL); |
| |
| spin_unlock_irqrestore(&drv->lock, flags); |
| |
| return 0; |
| } |
| |
| static const struct phy_ops rcar_gen2_phy_ops = { |
| .init = rcar_gen2_phy_init, |
| .exit = rcar_gen2_phy_exit, |
| .power_on = rcar_gen2_phy_power_on, |
| .power_off = rcar_gen2_phy_power_off, |
| .owner = THIS_MODULE, |
| }; |
| |
| static const struct phy_ops rz_g1c_phy_ops = { |
| .init = rcar_gen2_phy_init, |
| .exit = rcar_gen2_phy_exit, |
| .power_on = rz_g1c_phy_power_on, |
| .power_off = rz_g1c_phy_power_off, |
| .owner = THIS_MODULE, |
| }; |
| |
| static const u32 pci_select_value[][PHYS_PER_CHANNEL] = { |
| [0] = { USBHS_UGCTRL2_USB0SEL_PCI, USBHS_UGCTRL2_USB0SEL_HS_USB }, |
| [2] = { USBHS_UGCTRL2_USB2SEL_PCI, USBHS_UGCTRL2_USB2SEL_USB30 }, |
| }; |
| |
| static const u32 usb20_select_value[][PHYS_PER_CHANNEL] = { |
| { USBHS_UGCTRL2_USB0SEL_USB20, USBHS_UGCTRL2_USB0SEL_HS_USB20 }, |
| }; |
| |
| static const struct rcar_gen2_phy_data rcar_gen2_usb_phy_data = { |
| .gen2_phy_ops = &rcar_gen2_phy_ops, |
| .select_value = pci_select_value, |
| }; |
| |
| static const struct rcar_gen2_phy_data rz_g1c_usb_phy_data = { |
| .gen2_phy_ops = &rz_g1c_phy_ops, |
| .select_value = usb20_select_value, |
| }; |
| |
| static const struct of_device_id rcar_gen2_phy_match_table[] = { |
| { |
| .compatible = "renesas,usb-phy-r8a77470", |
| .data = &rz_g1c_usb_phy_data, |
| }, |
| { |
| .compatible = "renesas,usb-phy-r8a7790", |
| .data = &rcar_gen2_usb_phy_data, |
| }, |
| { |
| .compatible = "renesas,usb-phy-r8a7791", |
| .data = &rcar_gen2_usb_phy_data, |
| }, |
| { |
| .compatible = "renesas,usb-phy-r8a7794", |
| .data = &rcar_gen2_usb_phy_data, |
| }, |
| { |
| .compatible = "renesas,rcar-gen2-usb-phy", |
| .data = &rcar_gen2_usb_phy_data, |
| }, |
| { /* sentinel */ }, |
| }; |
| MODULE_DEVICE_TABLE(of, rcar_gen2_phy_match_table); |
| |
| static struct phy *rcar_gen2_phy_xlate(struct device *dev, |
| struct of_phandle_args *args) |
| { |
| struct rcar_gen2_phy_driver *drv; |
| struct device_node *np = args->np; |
| int i; |
| |
| drv = dev_get_drvdata(dev); |
| if (!drv) |
| return ERR_PTR(-EINVAL); |
| |
| for (i = 0; i < drv->num_channels; i++) { |
| if (np == drv->channels[i].of_node) |
| break; |
| } |
| |
| if (i >= drv->num_channels || args->args[0] >= 2) |
| return ERR_PTR(-ENODEV); |
| |
| return drv->channels[i].phys[args->args[0]].phy; |
| } |
| |
| static const u32 select_mask[] = { |
| [0] = USBHS_UGCTRL2_USB0SEL, |
| [2] = USBHS_UGCTRL2_USB2SEL, |
| }; |
| |
| static int rcar_gen2_phy_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct rcar_gen2_phy_driver *drv; |
| struct phy_provider *provider; |
| struct device_node *np; |
| struct resource *res; |
| void __iomem *base; |
| struct clk *clk; |
| const struct rcar_gen2_phy_data *data; |
| int i = 0; |
| |
| if (!dev->of_node) { |
| dev_err(dev, |
| "This driver is required to be instantiated from device tree\n"); |
| return -EINVAL; |
| } |
| |
| clk = devm_clk_get(dev, "usbhs"); |
| if (IS_ERR(clk)) { |
| dev_err(dev, "Can't get USBHS clock\n"); |
| return PTR_ERR(clk); |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| base = devm_ioremap_resource(dev, res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| |
| drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); |
| if (!drv) |
| return -ENOMEM; |
| |
| spin_lock_init(&drv->lock); |
| |
| drv->clk = clk; |
| drv->base = base; |
| |
| data = of_device_get_match_data(dev); |
| if (!data) |
| return -EINVAL; |
| |
| drv->num_channels = of_get_child_count(dev->of_node); |
| drv->channels = devm_kcalloc(dev, drv->num_channels, |
| sizeof(struct rcar_gen2_channel), |
| GFP_KERNEL); |
| if (!drv->channels) |
| return -ENOMEM; |
| |
| for_each_child_of_node(dev->of_node, np) { |
| struct rcar_gen2_channel *channel = drv->channels + i; |
| u32 channel_num; |
| int error, n; |
| |
| channel->of_node = np; |
| channel->drv = drv; |
| channel->selected_phy = -1; |
| |
| error = of_property_read_u32(np, "reg", &channel_num); |
| if (error || channel_num > 2) { |
| dev_err(dev, "Invalid \"reg\" property\n"); |
| of_node_put(np); |
| return error; |
| } |
| channel->select_mask = select_mask[channel_num]; |
| |
| for (n = 0; n < PHYS_PER_CHANNEL; n++) { |
| struct rcar_gen2_phy *phy = &channel->phys[n]; |
| |
| phy->channel = channel; |
| phy->number = n; |
| phy->select_value = data->select_value[channel_num][n]; |
| |
| phy->phy = devm_phy_create(dev, NULL, |
| data->gen2_phy_ops); |
| if (IS_ERR(phy->phy)) { |
| dev_err(dev, "Failed to create PHY\n"); |
| of_node_put(np); |
| return PTR_ERR(phy->phy); |
| } |
| phy_set_drvdata(phy->phy, phy); |
| } |
| |
| i++; |
| } |
| |
| provider = devm_of_phy_provider_register(dev, rcar_gen2_phy_xlate); |
| if (IS_ERR(provider)) { |
| dev_err(dev, "Failed to register PHY provider\n"); |
| return PTR_ERR(provider); |
| } |
| |
| dev_set_drvdata(dev, drv); |
| |
| return 0; |
| } |
| |
| static struct platform_driver rcar_gen2_phy_driver = { |
| .driver = { |
| .name = "phy_rcar_gen2", |
| .of_match_table = rcar_gen2_phy_match_table, |
| }, |
| .probe = rcar_gen2_phy_probe, |
| }; |
| |
| module_platform_driver(rcar_gen2_phy_driver); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("Renesas R-Car Gen2 PHY"); |
| MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>"); |
