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![Yoshihiro Shimoda](/assets/img/avatar_default.png)
The USB 3.0 PHY modules of R-Car Gen3 SoCs have: - Spread spectrum clock (ssc). - Using USB 2.0 EXTAL clock instead of USB 3.0 clock. - Enabling VBUS detection for usb3.0 peripheral. So, this driver supports these features. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
226 lines
5.5 KiB
C
226 lines
5.5 KiB
C
/*
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* Renesas R-Car Gen3 for USB3.0 PHY driver
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*
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* Copyright (C) 2017 Renesas Electronics Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#define USB30_CLKSET0 0x034
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#define USB30_CLKSET1 0x036
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#define USB30_SSC_SET 0x038
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#define USB30_PHY_ENABLE 0x060
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#define USB30_VBUS_EN 0x064
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/* USB30_CLKSET0 */
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#define CLKSET0_PRIVATE 0x05c0
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#define CLKSET0_USB30_FSEL_USB_EXTAL 0x0002
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/* USB30_CLKSET1 */
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#define CLKSET1_USB30_PLL_MULTI_SHIFT 6
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#define CLKSET1_USB30_PLL_MULTI_USB_EXTAL (0x64 << \
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CLKSET1_USB30_PLL_MULTI_SHIFT)
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#define CLKSET1_PHYRESET BIT(4) /* 1: reset */
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#define CLKSET1_REF_CLKDIV BIT(3) /* 1: USB_EXTAL */
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#define CLKSET1_PRIVATE_2_1 BIT(1) /* Write B'01 */
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#define CLKSET1_REF_CLK_SEL BIT(0) /* 1: USB3S0_CLK_P */
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/* USB30_SSC_SET */
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#define SSC_SET_SSC_EN BIT(12)
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#define SSC_SET_RANGE_SHIFT 9
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#define SSC_SET_RANGE_4980 (0x0 << SSC_SET_RANGE_SHIFT)
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#define SSC_SET_RANGE_4492 (0x1 << SSC_SET_RANGE_SHIFT)
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#define SSC_SET_RANGE_4003 (0x2 << SSC_SET_RANGE_SHIFT)
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/* USB30_PHY_ENABLE */
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#define PHY_ENABLE_RESET_EN BIT(4)
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/* USB30_VBUS_EN */
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#define VBUS_EN_VBUS_EN BIT(1)
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struct rcar_gen3_usb3 {
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void __iomem *base;
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struct phy *phy;
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u32 ssc_range;
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bool usb3s_clk;
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bool usb_extal;
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};
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static void write_clkset1_for_usb_extal(struct rcar_gen3_usb3 *r, bool reset)
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{
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u16 val = CLKSET1_USB30_PLL_MULTI_USB_EXTAL |
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CLKSET1_REF_CLKDIV | CLKSET1_PRIVATE_2_1;
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if (reset)
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val |= CLKSET1_PHYRESET;
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writew(val, r->base + USB30_CLKSET1);
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}
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static void rcar_gen3_phy_usb3_enable_ssc(struct rcar_gen3_usb3 *r)
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{
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u16 val = SSC_SET_SSC_EN;
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switch (r->ssc_range) {
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case 4980:
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val |= SSC_SET_RANGE_4980;
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break;
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case 4492:
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val |= SSC_SET_RANGE_4492;
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break;
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case 4003:
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val |= SSC_SET_RANGE_4003;
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break;
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default:
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dev_err(&r->phy->dev, "%s: unsupported range (%x)\n", __func__,
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r->ssc_range);
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return;
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}
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writew(val, r->base + USB30_SSC_SET);
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}
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static void rcar_gen3_phy_usb3_select_usb_extal(struct rcar_gen3_usb3 *r)
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{
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write_clkset1_for_usb_extal(r, false);
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if (r->ssc_range)
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rcar_gen3_phy_usb3_enable_ssc(r);
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writew(CLKSET0_PRIVATE | CLKSET0_USB30_FSEL_USB_EXTAL,
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r->base + USB30_CLKSET0);
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writew(PHY_ENABLE_RESET_EN, r->base + USB30_PHY_ENABLE);
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write_clkset1_for_usb_extal(r, true);
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usleep_range(10, 20);
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write_clkset1_for_usb_extal(r, false);
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}
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static int rcar_gen3_phy_usb3_init(struct phy *p)
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{
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struct rcar_gen3_usb3 *r = phy_get_drvdata(p);
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dev_vdbg(&r->phy->dev, "%s: enter (%d, %d, %d)\n", __func__,
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r->usb3s_clk, r->usb_extal, r->ssc_range);
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if (!r->usb3s_clk && r->usb_extal)
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rcar_gen3_phy_usb3_select_usb_extal(r);
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/* Enables VBUS detection anyway */
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writew(VBUS_EN_VBUS_EN, r->base + USB30_VBUS_EN);
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return 0;
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}
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static const struct phy_ops rcar_gen3_phy_usb3_ops = {
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.init = rcar_gen3_phy_usb3_init,
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.owner = THIS_MODULE,
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};
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static const struct of_device_id rcar_gen3_phy_usb3_match_table[] = {
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{ .compatible = "renesas,rcar-gen3-usb3-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb3_match_table);
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static int rcar_gen3_phy_usb3_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct rcar_gen3_usb3 *r;
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struct phy_provider *provider;
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struct resource *res;
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int ret = 0;
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struct clk *clk;
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if (!dev->of_node) {
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dev_err(dev, "This driver needs device tree\n");
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return -EINVAL;
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}
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r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL);
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if (!r)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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r->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(r->base))
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return PTR_ERR(r->base);
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clk = devm_clk_get(dev, "usb3s_clk");
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if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {
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r->usb3s_clk = !!clk_get_rate(clk);
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clk_disable_unprepare(clk);
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}
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clk = devm_clk_get(dev, "usb_extal");
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if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {
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r->usb_extal = !!clk_get_rate(clk);
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clk_disable_unprepare(clk);
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}
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if (!r->usb3s_clk && !r->usb_extal) {
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dev_err(dev, "This driver needs usb3s_clk and/or usb_extal\n");
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ret = -EINVAL;
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goto error;
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}
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/*
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* devm_phy_create() will call pm_runtime_enable(&phy->dev);
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* And then, phy-core will manage runtime pm for this device.
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*/
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pm_runtime_enable(dev);
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r->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops);
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if (IS_ERR(r->phy)) {
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dev_err(dev, "Failed to create USB3 PHY\n");
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ret = PTR_ERR(r->phy);
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goto error;
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}
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of_property_read_u32(dev->of_node, "renesas,ssc-range", &r->ssc_range);
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platform_set_drvdata(pdev, r);
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phy_set_drvdata(r->phy, r);
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provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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if (IS_ERR(provider)) {
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dev_err(dev, "Failed to register PHY provider\n");
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ret = PTR_ERR(provider);
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goto error;
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}
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return 0;
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error:
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pm_runtime_disable(dev);
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return ret;
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}
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static int rcar_gen3_phy_usb3_remove(struct platform_device *pdev)
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{
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pm_runtime_disable(&pdev->dev);
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return 0;
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};
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static struct platform_driver rcar_gen3_phy_usb3_driver = {
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.driver = {
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.name = "phy_rcar_gen3_usb3",
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.of_match_table = rcar_gen3_phy_usb3_match_table,
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},
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.probe = rcar_gen3_phy_usb3_probe,
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.remove = rcar_gen3_phy_usb3_remove,
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};
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module_platform_driver(rcar_gen3_phy_usb3_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 3.0 PHY");
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MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
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