239 lines
6.2 KiB
C
239 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2017 John Crispin <john@phrozen.org>
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*
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* Based on code from
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of_platform.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/regmap.h>
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#include <linux/reset.h>
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#define RT_SYSC_REG_SYSCFG1 0x014
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#define RT_SYSC_REG_CLKCFG1 0x030
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#define RT_SYSC_REG_USB_PHY_CFG 0x05c
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#define OFS_U2_PHY_AC0 0x800
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#define OFS_U2_PHY_AC1 0x804
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#define OFS_U2_PHY_AC2 0x808
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#define OFS_U2_PHY_ACR0 0x810
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#define OFS_U2_PHY_ACR1 0x814
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#define OFS_U2_PHY_ACR2 0x818
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#define OFS_U2_PHY_ACR3 0x81C
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#define OFS_U2_PHY_ACR4 0x820
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#define OFS_U2_PHY_AMON0 0x824
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#define OFS_U2_PHY_DCR0 0x860
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#define OFS_U2_PHY_DCR1 0x864
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#define OFS_U2_PHY_DTM0 0x868
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#define OFS_U2_PHY_DTM1 0x86C
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#define RT_RSTCTRL_UDEV BIT(25)
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#define RT_RSTCTRL_UHST BIT(22)
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#define RT_SYSCFG1_USB0_HOST_MODE BIT(10)
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#define MT7620_CLKCFG1_UPHY0_CLK_EN BIT(25)
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#define MT7620_CLKCFG1_UPHY1_CLK_EN BIT(22)
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#define RT_CLKCFG1_UPHY1_CLK_EN BIT(20)
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#define RT_CLKCFG1_UPHY0_CLK_EN BIT(18)
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#define USB_PHY_UTMI_8B60M BIT(1)
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#define UDEV_WAKEUP BIT(0)
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struct ralink_usb_phy {
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struct reset_control *rstdev;
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struct reset_control *rsthost;
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u32 clk;
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struct phy *phy;
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void __iomem *base;
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struct regmap *sysctl;
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};
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static void u2_phy_w32(struct ralink_usb_phy *phy, u32 val, u32 reg)
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{
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writel(val, phy->base + reg);
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}
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static u32 u2_phy_r32(struct ralink_usb_phy *phy, u32 reg)
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{
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return readl(phy->base + reg);
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}
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static void ralink_usb_phy_init(struct ralink_usb_phy *phy)
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{
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u2_phy_r32(phy, OFS_U2_PHY_AC2);
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u2_phy_r32(phy, OFS_U2_PHY_ACR0);
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u2_phy_r32(phy, OFS_U2_PHY_DCR0);
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u2_phy_w32(phy, 0x00ffff02, OFS_U2_PHY_DCR0);
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u2_phy_r32(phy, OFS_U2_PHY_DCR0);
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u2_phy_w32(phy, 0x00555502, OFS_U2_PHY_DCR0);
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u2_phy_r32(phy, OFS_U2_PHY_DCR0);
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u2_phy_w32(phy, 0x00aaaa02, OFS_U2_PHY_DCR0);
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u2_phy_r32(phy, OFS_U2_PHY_DCR0);
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u2_phy_w32(phy, 0x00000402, OFS_U2_PHY_DCR0);
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u2_phy_r32(phy, OFS_U2_PHY_DCR0);
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u2_phy_w32(phy, 0x0048086a, OFS_U2_PHY_AC0);
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u2_phy_w32(phy, 0x4400001c, OFS_U2_PHY_AC1);
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u2_phy_w32(phy, 0xc0200000, OFS_U2_PHY_ACR3);
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u2_phy_w32(phy, 0x02000000, OFS_U2_PHY_DTM0);
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}
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static int ralink_usb_phy_power_on(struct phy *_phy)
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{
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struct ralink_usb_phy *phy = phy_get_drvdata(_phy);
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u32 t;
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/* enable the phy */
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regmap_update_bits(phy->sysctl, RT_SYSC_REG_CLKCFG1,
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phy->clk, phy->clk);
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/* setup host mode */
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regmap_update_bits(phy->sysctl, RT_SYSC_REG_SYSCFG1,
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RT_SYSCFG1_USB0_HOST_MODE,
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RT_SYSCFG1_USB0_HOST_MODE);
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/* deassert the reset lines */
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reset_control_deassert(phy->rsthost);
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reset_control_deassert(phy->rstdev);
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/*
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* The SDK kernel had a delay of 100ms. however on device
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* testing showed that 10ms is enough
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*/
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mdelay(10);
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if (phy->base)
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ralink_usb_phy_init(phy);
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/* print some status info */
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regmap_read(phy->sysctl, RT_SYSC_REG_USB_PHY_CFG, &t);
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dev_info(&phy->phy->dev, "remote usb device wakeup %s\n",
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(t & UDEV_WAKEUP) ? ("enabled") : ("disabled"));
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if (t & USB_PHY_UTMI_8B60M)
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dev_info(&phy->phy->dev, "UTMI 8bit 60MHz\n");
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else
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dev_info(&phy->phy->dev, "UTMI 16bit 30MHz\n");
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return 0;
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}
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static int ralink_usb_phy_power_off(struct phy *_phy)
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{
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struct ralink_usb_phy *phy = phy_get_drvdata(_phy);
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/* disable the phy */
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regmap_update_bits(phy->sysctl, RT_SYSC_REG_CLKCFG1,
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phy->clk, 0);
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/* assert the reset lines */
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reset_control_assert(phy->rstdev);
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reset_control_assert(phy->rsthost);
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return 0;
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}
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static const struct phy_ops ralink_usb_phy_ops = {
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.power_on = ralink_usb_phy_power_on,
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.power_off = ralink_usb_phy_power_off,
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.owner = THIS_MODULE,
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};
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static const struct of_device_id ralink_usb_phy_of_match[] = {
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{
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.compatible = "ralink,rt3352-usbphy",
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.data = (void *)(uintptr_t)(RT_CLKCFG1_UPHY1_CLK_EN |
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RT_CLKCFG1_UPHY0_CLK_EN)
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},
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{
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.compatible = "mediatek,mt7620-usbphy",
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.data = (void *)(uintptr_t)(MT7620_CLKCFG1_UPHY1_CLK_EN |
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MT7620_CLKCFG1_UPHY0_CLK_EN)
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},
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{
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.compatible = "mediatek,mt7628-usbphy",
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.data = (void *)(uintptr_t)(MT7620_CLKCFG1_UPHY1_CLK_EN |
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MT7620_CLKCFG1_UPHY0_CLK_EN) },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ralink_usb_phy_of_match);
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static int ralink_usb_phy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct phy_provider *phy_provider;
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const struct of_device_id *match;
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struct ralink_usb_phy *phy;
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match = of_match_device(ralink_usb_phy_of_match, &pdev->dev);
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if (!match)
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return -ENODEV;
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phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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phy->clk = (uintptr_t)match->data;
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phy->base = NULL;
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phy->sysctl = syscon_regmap_lookup_by_phandle(dev->of_node, "ralink,sysctl");
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if (IS_ERR(phy->sysctl)) {
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dev_err(dev, "failed to get sysctl registers\n");
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return PTR_ERR(phy->sysctl);
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}
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/* The MT7628 and MT7688 require extra setup of PHY registers. */
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if (of_device_is_compatible(dev->of_node, "mediatek,mt7628-usbphy")) {
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phy->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(phy->base)) {
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dev_err(dev, "failed to remap register memory\n");
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return PTR_ERR(phy->base);
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}
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}
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phy->rsthost = devm_reset_control_get(&pdev->dev, "host");
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if (IS_ERR(phy->rsthost)) {
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dev_err(dev, "host reset is missing\n");
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return PTR_ERR(phy->rsthost);
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}
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phy->rstdev = devm_reset_control_get(&pdev->dev, "device");
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if (IS_ERR(phy->rstdev)) {
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dev_err(dev, "device reset is missing\n");
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return PTR_ERR(phy->rstdev);
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}
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phy->phy = devm_phy_create(dev, NULL, &ralink_usb_phy_ops);
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if (IS_ERR(phy->phy)) {
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dev_err(dev, "failed to create PHY\n");
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return PTR_ERR(phy->phy);
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}
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phy_set_drvdata(phy->phy, phy);
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phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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return PTR_ERR_OR_ZERO(phy_provider);
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}
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static struct platform_driver ralink_usb_phy_driver = {
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.probe = ralink_usb_phy_probe,
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.driver = {
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.of_match_table = ralink_usb_phy_of_match,
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.name = "ralink-usb-phy",
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}
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};
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module_platform_driver(ralink_usb_phy_driver);
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MODULE_DESCRIPTION("Ralink USB phy driver");
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MODULE_AUTHOR("John Crispin <john@phrozen.org>");
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MODULE_LICENSE("GPL v2");
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