mirror of https://gitee.com/openkylin/linux.git
543 lines
14 KiB
C
543 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Motorola Mapphone MDM6600 modem GPIO controlled USB PHY driver
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* Copyright (C) 2018 Tony Lindgren <tony@atomide.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/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of_platform.h>
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#include <linux/phy/phy.h>
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#define PHY_MDM6600_PHY_DELAY_MS 4000 /* PHY enable 2.2s to 3.5s */
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#define PHY_MDM6600_ENABLED_DELAY_MS 8000 /* 8s more total for MDM6600 */
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enum phy_mdm6600_ctrl_lines {
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PHY_MDM6600_ENABLE, /* USB PHY enable */
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PHY_MDM6600_POWER, /* Device power */
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PHY_MDM6600_RESET, /* Device reset */
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PHY_MDM6600_NR_CTRL_LINES,
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};
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enum phy_mdm6600_bootmode_lines {
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PHY_MDM6600_MODE0, /* out USB mode0 and OOB wake */
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PHY_MDM6600_MODE1, /* out USB mode1, in OOB wake */
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PHY_MDM6600_NR_MODE_LINES,
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};
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enum phy_mdm6600_cmd_lines {
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PHY_MDM6600_CMD0,
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PHY_MDM6600_CMD1,
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PHY_MDM6600_CMD2,
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PHY_MDM6600_NR_CMD_LINES,
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};
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enum phy_mdm6600_status_lines {
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PHY_MDM6600_STATUS0,
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PHY_MDM6600_STATUS1,
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PHY_MDM6600_STATUS2,
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PHY_MDM6600_NR_STATUS_LINES,
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};
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/*
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* MDM6600 command codes. These are based on Motorola Mapphone Linux
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* kernel tree.
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*/
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enum phy_mdm6600_cmd {
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PHY_MDM6600_CMD_BP_PANIC_ACK,
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PHY_MDM6600_CMD_DATA_ONLY_BYPASS, /* Reroute USB to CPCAP PHY */
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PHY_MDM6600_CMD_FULL_BYPASS, /* Reroute USB to CPCAP PHY */
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PHY_MDM6600_CMD_NO_BYPASS, /* Request normal USB mode */
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PHY_MDM6600_CMD_BP_SHUTDOWN_REQ, /* Request device power off */
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PHY_MDM6600_CMD_BP_UNKNOWN_5,
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PHY_MDM6600_CMD_BP_UNKNOWN_6,
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PHY_MDM6600_CMD_UNDEFINED,
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};
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/*
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* MDM6600 status codes. These are based on Motorola Mapphone Linux
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* kernel tree.
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*/
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enum phy_mdm6600_status {
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PHY_MDM6600_STATUS_PANIC, /* Seems to be really off */
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PHY_MDM6600_STATUS_PANIC_BUSY_WAIT,
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PHY_MDM6600_STATUS_QC_DLOAD,
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PHY_MDM6600_STATUS_RAM_DOWNLOADER, /* MDM6600 USB flashing mode */
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PHY_MDM6600_STATUS_PHONE_CODE_AWAKE, /* MDM6600 normal USB mode */
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PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP,
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PHY_MDM6600_STATUS_SHUTDOWN_ACK,
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PHY_MDM6600_STATUS_UNDEFINED,
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};
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static const char * const
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phy_mdm6600_status_name[] = {
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"off", "busy", "qc_dl", "ram_dl", "awake",
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"asleep", "shutdown", "undefined",
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};
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struct phy_mdm6600 {
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struct device *dev;
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struct phy *generic_phy;
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struct phy_provider *phy_provider;
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struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES];
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struct gpio_descs *mode_gpios;
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struct gpio_descs *status_gpios;
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struct gpio_descs *cmd_gpios;
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struct delayed_work bootup_work;
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struct delayed_work status_work;
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struct completion ack;
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bool enabled; /* mdm6600 phy enabled */
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bool running; /* mdm6600 boot done */
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int status;
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};
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static int phy_mdm6600_init(struct phy *x)
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{
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struct phy_mdm6600 *ddata = phy_get_drvdata(x);
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struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
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if (!ddata->enabled)
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return -EPROBE_DEFER;
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gpiod_set_value_cansleep(enable_gpio, 0);
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return 0;
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}
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static int phy_mdm6600_power_on(struct phy *x)
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{
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struct phy_mdm6600 *ddata = phy_get_drvdata(x);
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struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
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if (!ddata->enabled)
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return -ENODEV;
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gpiod_set_value_cansleep(enable_gpio, 1);
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return 0;
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}
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static int phy_mdm6600_power_off(struct phy *x)
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{
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struct phy_mdm6600 *ddata = phy_get_drvdata(x);
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struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
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if (!ddata->enabled)
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return -ENODEV;
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gpiod_set_value_cansleep(enable_gpio, 0);
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return 0;
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}
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static const struct phy_ops gpio_usb_ops = {
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.init = phy_mdm6600_init,
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.power_on = phy_mdm6600_power_on,
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.power_off = phy_mdm6600_power_off,
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.owner = THIS_MODULE,
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};
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/**
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* phy_mdm6600_cmd() - send a command request to mdm6600
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* @ddata: device driver data
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*
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* Configures the three command request GPIOs to the specified value.
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*/
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static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
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{
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int values[PHY_MDM6600_NR_CMD_LINES];
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int i;
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val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1;
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for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++)
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values[i] = (val & BIT(i)) >> i;
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gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
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ddata->cmd_gpios->desc, values);
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}
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/**
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* phy_mdm6600_status() - read mdm6600 status lines
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* @ddata: device driver data
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*/
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static void phy_mdm6600_status(struct work_struct *work)
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{
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struct phy_mdm6600 *ddata;
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struct device *dev;
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int values[PHY_MDM6600_NR_STATUS_LINES];
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int error, i, val = 0;
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ddata = container_of(work, struct phy_mdm6600, status_work.work);
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dev = ddata->dev;
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error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
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ddata->status_gpios->desc,
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values);
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if (error)
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return;
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for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++) {
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val |= values[i] << i;
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dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
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__func__, i, values[i], val);
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}
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ddata->status = val;
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dev_info(dev, "modem status: %i %s\n",
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ddata->status,
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phy_mdm6600_status_name[ddata->status & 7]);
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complete(&ddata->ack);
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}
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static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
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{
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struct phy_mdm6600 *ddata = data;
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schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
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return IRQ_HANDLED;
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}
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/**
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* phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
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* @irq: interrupt
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* @data: interrupt handler data
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*
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* GPIO mode1 is used initially as output to configure the USB boot
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* mode for mdm6600. After booting it is used as input for OOB wake
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* signal from mdm6600 to the SoC. Just use it for debug info only
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* for now.
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*/
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static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
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{
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struct phy_mdm6600 *ddata = data;
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struct gpio_desc *mode_gpio1;
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mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
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dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n",
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gpiod_get_value(mode_gpio1));
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return IRQ_HANDLED;
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}
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/**
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* phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
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* @ddata: device driver data
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*/
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static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
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{
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struct device *dev = ddata->dev;
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int i, error, irq;
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for (i = PHY_MDM6600_STATUS0;
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i <= PHY_MDM6600_STATUS2; i++) {
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struct gpio_desc *gpio = ddata->status_gpios->desc[i];
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irq = gpiod_to_irq(gpio);
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if (irq <= 0)
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continue;
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error = devm_request_threaded_irq(dev, irq, NULL,
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phy_mdm6600_irq_thread,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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"mdm6600",
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ddata);
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if (error)
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dev_warn(dev, "no modem status irq%i: %i\n",
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irq, error);
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}
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}
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struct phy_mdm6600_map {
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const char *name;
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int direction;
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};
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static const struct phy_mdm6600_map
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phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
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{ "enable", GPIOD_OUT_LOW, }, /* low = phy disabled */
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{ "power", GPIOD_OUT_LOW, }, /* low = off */
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{ "reset", GPIOD_OUT_HIGH, }, /* high = reset */
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};
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/**
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* phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
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* @ddata: device driver data
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*/
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static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
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{
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struct device *dev = ddata->dev;
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int i;
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/* MDM6600 control lines */
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for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
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const struct phy_mdm6600_map *map =
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&phy_mdm6600_ctrl_gpio_map[i];
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struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
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*gpio = devm_gpiod_get(dev, map->name, map->direction);
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if (IS_ERR(*gpio)) {
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dev_info(dev, "gpio %s error %li\n",
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map->name, PTR_ERR(*gpio));
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return PTR_ERR(*gpio);
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}
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}
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/* MDM6600 USB start-up mode output lines */
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ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
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GPIOD_OUT_LOW);
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if (IS_ERR(ddata->mode_gpios))
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return PTR_ERR(ddata->mode_gpios);
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if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
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return -EINVAL;
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/* MDM6600 status input lines */
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ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
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GPIOD_IN);
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if (IS_ERR(ddata->status_gpios))
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return PTR_ERR(ddata->status_gpios);
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if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
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return -EINVAL;
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/* MDM6600 cmd output lines */
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ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
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GPIOD_OUT_LOW);
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if (IS_ERR(ddata->cmd_gpios))
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return PTR_ERR(ddata->cmd_gpios);
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if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
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return -EINVAL;
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return 0;
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}
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/**
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* phy_mdm6600_device_power_on() - power on mdm6600 device
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* @ddata: device driver data
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*
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* To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
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* the shared USB bootmode GPIOs are configured, then request modem start-up,
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* reset and power-up.. And then we need to recycle the shared USB bootmode
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* GPIOs as they are also used for Out of Band (OOB) wake for the USB and
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* TS 27.010 serial mux.
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*/
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static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
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{
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struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
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int error = 0, wakeirq;
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mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
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mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
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reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
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power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
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/*
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* Shared GPIOs must be low for normal USB mode. After booting
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* they are used for OOB wake signaling. These can be also used
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* to configure USB flashing mode later on based on a module
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* parameter.
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*/
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gpiod_set_value_cansleep(mode_gpio0, 0);
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gpiod_set_value_cansleep(mode_gpio1, 0);
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/* Request start-up mode */
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phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
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/* Request a reset first */
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gpiod_set_value_cansleep(reset_gpio, 0);
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msleep(100);
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/* Toggle power GPIO to request mdm6600 to start */
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gpiod_set_value_cansleep(power_gpio, 1);
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msleep(100);
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gpiod_set_value_cansleep(power_gpio, 0);
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/*
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* Looks like the USB PHY needs between 2.2 to 4 seconds.
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* If we try to use it before that, we will get L3 errors
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* from omap-usb-host trying to access the PHY. See also
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* phy_mdm6600_init() for -EPROBE_DEFER.
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*/
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msleep(PHY_MDM6600_PHY_DELAY_MS);
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ddata->enabled = true;
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/* Booting up the rest of MDM6600 will take total about 8 seconds */
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dev_info(ddata->dev, "Waiting for power up request to complete..\n");
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if (wait_for_completion_timeout(&ddata->ack,
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msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
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if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
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ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
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dev_info(ddata->dev, "Powered up OK\n");
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} else {
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ddata->enabled = false;
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error = -ETIMEDOUT;
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dev_err(ddata->dev, "Timed out powering up\n");
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}
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/* Reconfigure mode1 GPIO as input for OOB wake */
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gpiod_direction_input(mode_gpio1);
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wakeirq = gpiod_to_irq(mode_gpio1);
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if (wakeirq <= 0)
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return wakeirq;
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error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
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phy_mdm6600_wakeirq_thread,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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"mdm6600-wake",
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ddata);
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if (error)
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dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
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wakeirq, error);
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ddata->running = true;
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return error;
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}
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/**
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* phy_mdm6600_device_power_off() - power off mdm6600 device
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* @ddata: device driver data
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*/
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static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
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{
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struct gpio_desc *reset_gpio =
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ddata->ctrl_gpios[PHY_MDM6600_RESET];
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ddata->enabled = false;
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phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
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msleep(100);
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gpiod_set_value_cansleep(reset_gpio, 1);
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dev_info(ddata->dev, "Waiting for power down request to complete.. ");
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if (wait_for_completion_timeout(&ddata->ack,
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msecs_to_jiffies(5000))) {
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if (ddata->status == PHY_MDM6600_STATUS_PANIC)
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dev_info(ddata->dev, "Powered down OK\n");
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} else {
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dev_err(ddata->dev, "Timed out powering down\n");
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}
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}
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static void phy_mdm6600_deferred_power_on(struct work_struct *work)
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{
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struct phy_mdm6600 *ddata;
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int error;
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ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
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error = phy_mdm6600_device_power_on(ddata);
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if (error)
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dev_err(ddata->dev, "Device not functional\n");
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}
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static const struct of_device_id phy_mdm6600_id_table[] = {
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{ .compatible = "motorola,mapphone-mdm6600", },
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{},
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};
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MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
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static int phy_mdm6600_probe(struct platform_device *pdev)
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{
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struct phy_mdm6600 *ddata;
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int error;
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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INIT_DELAYED_WORK(&ddata->bootup_work,
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phy_mdm6600_deferred_power_on);
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INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
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init_completion(&ddata->ack);
|
|
|
|
ddata->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, ddata);
|
|
|
|
error = phy_mdm6600_init_lines(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
phy_mdm6600_init_irq(ddata);
|
|
|
|
ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
|
|
if (IS_ERR(ddata->generic_phy)) {
|
|
error = PTR_ERR(ddata->generic_phy);
|
|
goto cleanup;
|
|
}
|
|
|
|
phy_set_drvdata(ddata->generic_phy, ddata);
|
|
|
|
ddata->phy_provider =
|
|
devm_of_phy_provider_register(ddata->dev,
|
|
of_phy_simple_xlate);
|
|
if (IS_ERR(ddata->phy_provider)) {
|
|
error = PTR_ERR(ddata->phy_provider);
|
|
goto cleanup;
|
|
}
|
|
|
|
schedule_delayed_work(&ddata->bootup_work, 0);
|
|
|
|
/*
|
|
* See phy_mdm6600_device_power_on(). We should be able
|
|
* to remove this eventually when ohci-platform can deal
|
|
* with -EPROBE_DEFER.
|
|
*/
|
|
msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
phy_mdm6600_device_power_off(ddata);
|
|
return error;
|
|
}
|
|
|
|
static int phy_mdm6600_remove(struct platform_device *pdev)
|
|
{
|
|
struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
|
|
struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
|
|
|
|
if (!ddata->running)
|
|
wait_for_completion_timeout(&ddata->ack,
|
|
msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
|
|
|
|
gpiod_set_value_cansleep(reset_gpio, 1);
|
|
phy_mdm6600_device_power_off(ddata);
|
|
|
|
cancel_delayed_work_sync(&ddata->bootup_work);
|
|
cancel_delayed_work_sync(&ddata->status_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver phy_mdm6600_driver = {
|
|
.probe = phy_mdm6600_probe,
|
|
.remove = phy_mdm6600_remove,
|
|
.driver = {
|
|
.name = "phy-mapphone-mdm6600",
|
|
.of_match_table = of_match_ptr(phy_mdm6600_id_table),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(phy_mdm6600_driver);
|
|
|
|
MODULE_ALIAS("platform:gpio_usb");
|
|
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
|
|
MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
|
|
MODULE_LICENSE("GPL v2");
|