418 lines
11 KiB
C
418 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (C) 2017 Broadcom
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#include <linux/delay.h>
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#include <linux/extcon-provider.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/irq.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.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/slab.h>
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#include <linux/workqueue.h>
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#define ICFG_DRD_AFE 0x0
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#define ICFG_MISC_STAT 0x18
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#define ICFG_DRD_P0CTL 0x1C
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#define ICFG_STRAP_CTRL 0x20
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#define ICFG_FSM_CTRL 0x24
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#define ICFG_DEV_BIT BIT(2)
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#define IDM_RST_BIT BIT(0)
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#define AFE_CORERDY_VDDC BIT(18)
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#define PHY_PLL_RESETB BIT(15)
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#define PHY_RESETB BIT(14)
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#define PHY_PLL_LOCK BIT(0)
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#define DRD_DEV_MODE BIT(20)
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#define OHCI_OVRCUR_POL BIT(11)
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#define ICFG_OFF_MODE BIT(6)
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#define PLL_LOCK_RETRY 1000
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#define EVT_DEVICE 0
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#define EVT_HOST 1
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#define DRD_HOST_MODE (BIT(2) | BIT(3))
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#define DRD_DEVICE_MODE (BIT(4) | BIT(5))
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#define DRD_HOST_VAL 0x803
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#define DRD_DEV_VAL 0x807
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#define GPIO_DELAY 20
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struct ns2_phy_data;
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struct ns2_phy_driver {
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void __iomem *icfgdrd_regs;
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void __iomem *idmdrd_rst_ctrl;
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void __iomem *crmu_usb2_ctrl;
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void __iomem *usb2h_strap_reg;
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struct ns2_phy_data *data;
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struct extcon_dev *edev;
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struct gpio_desc *vbus_gpiod;
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struct gpio_desc *id_gpiod;
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int id_irq;
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int vbus_irq;
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unsigned long debounce_jiffies;
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struct delayed_work wq_extcon;
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};
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struct ns2_phy_data {
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struct ns2_phy_driver *driver;
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struct phy *phy;
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int new_state;
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};
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static const unsigned int usb_extcon_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static inline int pll_lock_stat(u32 usb_reg, int reg_mask,
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struct ns2_phy_driver *driver)
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{
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u32 val;
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return readl_poll_timeout_atomic(driver->icfgdrd_regs + usb_reg,
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val, (val & reg_mask), 1,
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PLL_LOCK_RETRY);
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}
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static int ns2_drd_phy_init(struct phy *phy)
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{
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struct ns2_phy_data *data = phy_get_drvdata(phy);
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struct ns2_phy_driver *driver = data->driver;
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u32 val;
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val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
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if (data->new_state == EVT_HOST) {
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val &= ~DRD_DEVICE_MODE;
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val |= DRD_HOST_MODE;
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} else {
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val &= ~DRD_HOST_MODE;
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val |= DRD_DEVICE_MODE;
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}
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writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
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return 0;
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}
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static int ns2_drd_phy_poweroff(struct phy *phy)
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{
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struct ns2_phy_data *data = phy_get_drvdata(phy);
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struct ns2_phy_driver *driver = data->driver;
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u32 val;
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val = readl(driver->crmu_usb2_ctrl);
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val &= ~AFE_CORERDY_VDDC;
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writel(val, driver->crmu_usb2_ctrl);
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val = readl(driver->crmu_usb2_ctrl);
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val &= ~DRD_DEV_MODE;
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writel(val, driver->crmu_usb2_ctrl);
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/* Disable Host and Device Mode */
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val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
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val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE | ICFG_OFF_MODE);
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writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
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return 0;
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}
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static int ns2_drd_phy_poweron(struct phy *phy)
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{
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struct ns2_phy_data *data = phy_get_drvdata(phy);
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struct ns2_phy_driver *driver = data->driver;
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u32 extcon_event = data->new_state;
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int ret;
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u32 val;
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if (extcon_event == EVT_DEVICE) {
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writel(DRD_DEV_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
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val = readl(driver->idmdrd_rst_ctrl);
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val &= ~IDM_RST_BIT;
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writel(val, driver->idmdrd_rst_ctrl);
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val = readl(driver->crmu_usb2_ctrl);
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val |= (AFE_CORERDY_VDDC | DRD_DEV_MODE);
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writel(val, driver->crmu_usb2_ctrl);
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/* Bring PHY and PHY_PLL out of Reset */
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val = readl(driver->crmu_usb2_ctrl);
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val |= (PHY_PLL_RESETB | PHY_RESETB);
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writel(val, driver->crmu_usb2_ctrl);
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ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
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if (ret < 0) {
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dev_err(&phy->dev, "Phy PLL lock failed\n");
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return ret;
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}
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} else {
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writel(DRD_HOST_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
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val = readl(driver->crmu_usb2_ctrl);
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val |= AFE_CORERDY_VDDC;
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writel(val, driver->crmu_usb2_ctrl);
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ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
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if (ret < 0) {
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dev_err(&phy->dev, "Phy PLL lock failed\n");
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return ret;
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}
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val = readl(driver->idmdrd_rst_ctrl);
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val &= ~IDM_RST_BIT;
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writel(val, driver->idmdrd_rst_ctrl);
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/* port over current Polarity */
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val = readl(driver->usb2h_strap_reg);
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val |= OHCI_OVRCUR_POL;
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writel(val, driver->usb2h_strap_reg);
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}
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return 0;
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}
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static void connect_change(struct ns2_phy_driver *driver)
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{
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u32 extcon_event;
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u32 val;
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extcon_event = driver->data->new_state;
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val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
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switch (extcon_event) {
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case EVT_DEVICE:
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val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
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writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
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val = (val & ~DRD_HOST_MODE) | DRD_DEVICE_MODE;
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writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
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val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
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val |= ICFG_DEV_BIT;
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writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
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break;
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case EVT_HOST:
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val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
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writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
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val = (val & ~DRD_DEVICE_MODE) | DRD_HOST_MODE;
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writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
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val = readl(driver->usb2h_strap_reg);
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val |= OHCI_OVRCUR_POL;
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writel(val, driver->usb2h_strap_reg);
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val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
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val &= ~ICFG_DEV_BIT;
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writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
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break;
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default:
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pr_err("Invalid extcon event\n");
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break;
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}
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}
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static void extcon_work(struct work_struct *work)
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{
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struct ns2_phy_driver *driver;
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int vbus;
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int id;
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driver = container_of(to_delayed_work(work),
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struct ns2_phy_driver, wq_extcon);
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id = gpiod_get_value_cansleep(driver->id_gpiod);
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vbus = gpiod_get_value_cansleep(driver->vbus_gpiod);
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if (!id && vbus) { /* Host connected */
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extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, true);
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pr_debug("Host cable connected\n");
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driver->data->new_state = EVT_HOST;
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connect_change(driver);
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} else if (id && !vbus) { /* Disconnected */
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extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, false);
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extcon_set_state_sync(driver->edev, EXTCON_USB, false);
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pr_debug("Cable disconnected\n");
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} else if (id && vbus) { /* Device connected */
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extcon_set_state_sync(driver->edev, EXTCON_USB, true);
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pr_debug("Device cable connected\n");
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driver->data->new_state = EVT_DEVICE;
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connect_change(driver);
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}
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}
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static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
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{
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struct ns2_phy_driver *driver = dev_id;
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queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
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driver->debounce_jiffies);
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return IRQ_HANDLED;
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}
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static const struct phy_ops ops = {
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.init = ns2_drd_phy_init,
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.power_on = ns2_drd_phy_poweron,
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.power_off = ns2_drd_phy_poweroff,
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.owner = THIS_MODULE,
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};
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static const struct of_device_id ns2_drd_phy_dt_ids[] = {
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{ .compatible = "brcm,ns2-drd-phy", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ns2_drd_phy_dt_ids);
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static int ns2_drd_phy_probe(struct platform_device *pdev)
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{
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struct phy_provider *phy_provider;
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struct device *dev = &pdev->dev;
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struct ns2_phy_driver *driver;
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struct ns2_phy_data *data;
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int ret;
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u32 val;
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driver = devm_kzalloc(dev, sizeof(struct ns2_phy_driver),
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GFP_KERNEL);
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if (!driver)
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return -ENOMEM;
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driver->data = devm_kzalloc(dev, sizeof(struct ns2_phy_data),
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GFP_KERNEL);
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if (!driver->data)
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return -ENOMEM;
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driver->icfgdrd_regs = devm_platform_ioremap_resource_byname(pdev, "icfg");
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if (IS_ERR(driver->icfgdrd_regs))
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return PTR_ERR(driver->icfgdrd_regs);
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driver->idmdrd_rst_ctrl = devm_platform_ioremap_resource_byname(pdev, "rst-ctrl");
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if (IS_ERR(driver->idmdrd_rst_ctrl))
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return PTR_ERR(driver->idmdrd_rst_ctrl);
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driver->crmu_usb2_ctrl = devm_platform_ioremap_resource_byname(pdev, "crmu-ctrl");
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if (IS_ERR(driver->crmu_usb2_ctrl))
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return PTR_ERR(driver->crmu_usb2_ctrl);
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driver->usb2h_strap_reg = devm_platform_ioremap_resource_byname(pdev, "usb2-strap");
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if (IS_ERR(driver->usb2h_strap_reg))
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return PTR_ERR(driver->usb2h_strap_reg);
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/* create extcon */
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driver->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
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if (IS_ERR(driver->id_gpiod)) {
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dev_err(dev, "failed to get ID GPIO\n");
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return PTR_ERR(driver->id_gpiod);
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}
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driver->vbus_gpiod = devm_gpiod_get(&pdev->dev, "vbus", GPIOD_IN);
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if (IS_ERR(driver->vbus_gpiod)) {
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dev_err(dev, "failed to get VBUS GPIO\n");
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return PTR_ERR(driver->vbus_gpiod);
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}
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driver->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
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if (IS_ERR(driver->edev)) {
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dev_err(dev, "failed to allocate extcon device\n");
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return -ENOMEM;
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}
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ret = devm_extcon_dev_register(dev, driver->edev);
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if (ret < 0) {
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dev_err(dev, "failed to register extcon device\n");
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return ret;
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}
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ret = gpiod_set_debounce(driver->id_gpiod, GPIO_DELAY * 1000);
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if (ret < 0)
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driver->debounce_jiffies = msecs_to_jiffies(GPIO_DELAY);
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INIT_DELAYED_WORK(&driver->wq_extcon, extcon_work);
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driver->id_irq = gpiod_to_irq(driver->id_gpiod);
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if (driver->id_irq < 0) {
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dev_err(dev, "failed to get ID IRQ\n");
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return driver->id_irq;
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}
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|
|
||
|
|
driver->vbus_irq = gpiod_to_irq(driver->vbus_gpiod);
|
||
|
|
if (driver->vbus_irq < 0) {
|
||
|
|
dev_err(dev, "failed to get ID IRQ\n");
|
||
|
|
return driver->vbus_irq;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = devm_request_irq(dev, driver->id_irq, gpio_irq_handler,
|
||
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
||
|
|
"usb_id", driver);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(dev, "failed to request handler for ID IRQ\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = devm_request_irq(dev, driver->vbus_irq, gpio_irq_handler,
|
||
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
||
|
|
"usb_vbus", driver);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(dev, "failed to request handler for VBUS IRQ\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev_set_drvdata(dev, driver);
|
||
|
|
|
||
|
|
/* Shutdown all ports. They can be powered up as required */
|
||
|
|
val = readl(driver->crmu_usb2_ctrl);
|
||
|
|
val &= ~(AFE_CORERDY_VDDC | PHY_RESETB);
|
||
|
|
writel(val, driver->crmu_usb2_ctrl);
|
||
|
|
|
||
|
|
data = driver->data;
|
||
|
|
data->phy = devm_phy_create(dev, dev->of_node, &ops);
|
||
|
|
if (IS_ERR(data->phy)) {
|
||
|
|
dev_err(dev, "Failed to create usb drd phy\n");
|
||
|
|
return PTR_ERR(data->phy);
|
||
|
|
}
|
||
|
|
|
||
|
|
data->driver = driver;
|
||
|
|
phy_set_drvdata(data->phy, data);
|
||
|
|
|
||
|
|
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
||
|
|
if (IS_ERR(phy_provider)) {
|
||
|
|
dev_err(dev, "Failed to register as phy provider\n");
|
||
|
|
return PTR_ERR(phy_provider);
|
||
|
|
}
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, driver);
|
||
|
|
|
||
|
|
dev_info(dev, "Registered NS2 DRD Phy device\n");
|
||
|
|
queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
|
||
|
|
driver->debounce_jiffies);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver ns2_drd_phy_driver = {
|
||
|
|
.probe = ns2_drd_phy_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "bcm-ns2-usbphy",
|
||
|
|
.of_match_table = of_match_ptr(ns2_drd_phy_dt_ids),
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(ns2_drd_phy_driver);
|
||
|
|
|
||
|
|
MODULE_ALIAS("platform:bcm-ns2-drd-phy");
|
||
|
|
MODULE_AUTHOR("Broadcom");
|
||
|
|
MODULE_DESCRIPTION("Broadcom NS2 USB2 PHY driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|