diff options
Diffstat (limited to 'drivers/phy/motorola')
| -rw-r--r-- | drivers/phy/motorola/Kconfig | 20 | ||||
| -rw-r--r-- | drivers/phy/motorola/Makefile | 6 | ||||
| -rw-r--r-- | drivers/phy/motorola/phy-cpcap-usb.c | 698 | ||||
| -rw-r--r-- | drivers/phy/motorola/phy-mapphone-mdm6600.c | 648 |
4 files changed, 1372 insertions, 0 deletions
diff --git a/drivers/phy/motorola/Kconfig b/drivers/phy/motorola/Kconfig new file mode 100644 index 000000000..718f87297 --- /dev/null +++ b/drivers/phy/motorola/Kconfig @@ -0,0 +1,20 @@ +# +# Phy drivers for Motorola devices +# +config PHY_CPCAP_USB + tristate "CPCAP PMIC USB PHY driver" + depends on USB_SUPPORT && IIO + depends on USB_MUSB_HDRC || USB_MUSB_HDRC=n + select GENERIC_PHY + select USB_PHY + help + Enable this for USB to work on Motorola phones and tablets + such as Droid 4. + +config PHY_MAPPHONE_MDM6600 + tristate "Motorola Mapphone MDM6600 modem USB PHY driver" + depends on OF && USB_SUPPORT && GPIOLIB + select GENERIC_PHY + help + Enable this for MDM6600 USB modem to work on Motorola phones + and tablets such as Droid 4. diff --git a/drivers/phy/motorola/Makefile b/drivers/phy/motorola/Makefile new file mode 100644 index 000000000..3514f985b --- /dev/null +++ b/drivers/phy/motorola/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for the phy drivers. +# + +obj-$(CONFIG_PHY_CPCAP_USB) += phy-cpcap-usb.o +obj-$(CONFIG_PHY_MAPPHONE_MDM6600) += phy-mapphone-mdm6600.o diff --git a/drivers/phy/motorola/phy-cpcap-usb.c b/drivers/phy/motorola/phy-cpcap-usb.c new file mode 100644 index 000000000..106f53f33 --- /dev/null +++ b/drivers/phy/motorola/phy-cpcap-usb.c @@ -0,0 +1,698 @@ +/* + * Motorola CPCAP PMIC USB PHY driver + * Copyright (C) 2017 Tony Lindgren <tony@atomide.com> + * + * Some parts based on earlier Motorola Linux kernel tree code in + * board-mapphone-usb.c and cpcap-usb-det.c: + * Copyright (C) 2007 - 2011 Motorola, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/atomic.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/iio/consumer.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +#include <linux/gpio/consumer.h> +#include <linux/mfd/motorola-cpcap.h> +#include <linux/phy/omap_usb.h> +#include <linux/phy/phy.h> +#include <linux/regulator/consumer.h> +#include <linux/usb/musb.h> + +/* CPCAP_REG_USBC1 register bits */ +#define CPCAP_BIT_IDPULSE BIT(15) +#define CPCAP_BIT_ID100KPU BIT(14) +#define CPCAP_BIT_IDPUCNTRL BIT(13) +#define CPCAP_BIT_IDPU BIT(12) +#define CPCAP_BIT_IDPD BIT(11) +#define CPCAP_BIT_VBUSCHRGTMR3 BIT(10) +#define CPCAP_BIT_VBUSCHRGTMR2 BIT(9) +#define CPCAP_BIT_VBUSCHRGTMR1 BIT(8) +#define CPCAP_BIT_VBUSCHRGTMR0 BIT(7) +#define CPCAP_BIT_VBUSPU BIT(6) +#define CPCAP_BIT_VBUSPD BIT(5) +#define CPCAP_BIT_DMPD BIT(4) +#define CPCAP_BIT_DPPD BIT(3) +#define CPCAP_BIT_DM1K5PU BIT(2) +#define CPCAP_BIT_DP1K5PU BIT(1) +#define CPCAP_BIT_DP150KPU BIT(0) + +/* CPCAP_REG_USBC2 register bits */ +#define CPCAP_BIT_ZHSDRV1 BIT(15) +#define CPCAP_BIT_ZHSDRV0 BIT(14) +#define CPCAP_BIT_DPLLCLKREQ BIT(13) +#define CPCAP_BIT_SE0CONN BIT(12) +#define CPCAP_BIT_UARTTXTRI BIT(11) +#define CPCAP_BIT_UARTSWAP BIT(10) +#define CPCAP_BIT_UARTMUX1 BIT(9) +#define CPCAP_BIT_UARTMUX0 BIT(8) +#define CPCAP_BIT_ULPISTPLOW BIT(7) +#define CPCAP_BIT_TXENPOL BIT(6) +#define CPCAP_BIT_USBXCVREN BIT(5) +#define CPCAP_BIT_USBCNTRL BIT(4) +#define CPCAP_BIT_USBSUSPEND BIT(3) +#define CPCAP_BIT_EMUMODE2 BIT(2) +#define CPCAP_BIT_EMUMODE1 BIT(1) +#define CPCAP_BIT_EMUMODE0 BIT(0) + +/* CPCAP_REG_USBC3 register bits */ +#define CPCAP_BIT_SPARE_898_15 BIT(15) +#define CPCAP_BIT_IHSTX03 BIT(14) +#define CPCAP_BIT_IHSTX02 BIT(13) +#define CPCAP_BIT_IHSTX01 BIT(12) +#define CPCAP_BIT_IHSTX0 BIT(11) +#define CPCAP_BIT_IDPU_SPI BIT(10) +#define CPCAP_BIT_UNUSED_898_9 BIT(9) +#define CPCAP_BIT_VBUSSTBY_EN BIT(8) +#define CPCAP_BIT_VBUSEN_SPI BIT(7) +#define CPCAP_BIT_VBUSPU_SPI BIT(6) +#define CPCAP_BIT_VBUSPD_SPI BIT(5) +#define CPCAP_BIT_DMPD_SPI BIT(4) +#define CPCAP_BIT_DPPD_SPI BIT(3) +#define CPCAP_BIT_SUSPEND_SPI BIT(2) +#define CPCAP_BIT_PU_SPI BIT(1) +#define CPCAP_BIT_ULPI_SPI_SEL BIT(0) + +struct cpcap_usb_ints_state { + bool id_ground; + bool id_float; + bool chrg_det; + bool rvrs_chrg; + bool vbusov; + + bool chrg_se1b; + bool se0conn; + bool rvrs_mode; + bool chrgcurr1; + bool vbusvld; + bool sessvld; + bool sessend; + bool se1; + + bool battdetb; + bool dm; + bool dp; +}; + +enum cpcap_gpio_mode { + CPCAP_DM_DP, + CPCAP_MDM_RX_TX, + CPCAP_UNKNOWN_DISABLED, /* Seems to disable USB lines */ + CPCAP_OTG_DM_DP, +}; + +struct cpcap_phy_ddata { + struct regmap *reg; + struct device *dev; + struct clk *refclk; + struct usb_phy phy; + struct delayed_work detect_work; + struct pinctrl *pins; + struct pinctrl_state *pins_ulpi; + struct pinctrl_state *pins_utmi; + struct pinctrl_state *pins_uart; + struct gpio_desc *gpio[2]; + struct iio_channel *vbus; + struct iio_channel *id; + struct regulator *vusb; + atomic_t active; +}; + +static bool cpcap_usb_vbus_valid(struct cpcap_phy_ddata *ddata) +{ + int error, value = 0; + + error = iio_read_channel_processed(ddata->vbus, &value); + if (error >= 0) + return value > 3900 ? true : false; + + dev_err(ddata->dev, "error reading VBUS: %i\n", error); + + return false; +} + +static int cpcap_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host) +{ + otg->host = host; + if (!host) + otg->state = OTG_STATE_UNDEFINED; + + return 0; +} + +static int cpcap_usb_phy_set_peripheral(struct usb_otg *otg, + struct usb_gadget *gadget) +{ + otg->gadget = gadget; + if (!gadget) + otg->state = OTG_STATE_UNDEFINED; + + return 0; +} + +static const struct phy_ops ops = { + .owner = THIS_MODULE, +}; + +static int cpcap_phy_get_ints_state(struct cpcap_phy_ddata *ddata, + struct cpcap_usb_ints_state *s) +{ + int val, error; + + error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val); + if (error) + return error; + + s->id_ground = val & BIT(15); + s->id_float = val & BIT(14); + s->vbusov = val & BIT(11); + + error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val); + if (error) + return error; + + s->vbusvld = val & BIT(3); + s->sessvld = val & BIT(2); + s->sessend = val & BIT(1); + s->se1 = val & BIT(0); + + error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val); + if (error) + return error; + + s->dm = val & BIT(1); + s->dp = val & BIT(0); + + return 0; +} + +static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata); +static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata); + +static void cpcap_usb_try_musb_mailbox(struct cpcap_phy_ddata *ddata, + enum musb_vbus_id_status status) +{ + int error; + + error = musb_mailbox(status); + if (!error) + return; + + dev_dbg(ddata->dev, "%s: musb_mailbox failed: %i\n", + __func__, error); +} + +static void cpcap_usb_detect(struct work_struct *work) +{ + struct cpcap_phy_ddata *ddata; + struct cpcap_usb_ints_state s; + bool vbus = false; + int error; + + ddata = container_of(work, struct cpcap_phy_ddata, detect_work.work); + + error = cpcap_phy_get_ints_state(ddata, &s); + if (error) + return; + + if (s.id_ground) { + dev_dbg(ddata->dev, "id ground, USB host mode\n"); + error = cpcap_usb_set_usb_mode(ddata); + if (error) + goto out_err; + + cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND); + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, + CPCAP_BIT_VBUSSTBY_EN, + CPCAP_BIT_VBUSSTBY_EN); + if (error) + goto out_err; + + return; + } + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, + CPCAP_BIT_VBUSSTBY_EN, 0); + if (error) + goto out_err; + + vbus = cpcap_usb_vbus_valid(ddata); + + if (vbus) { + /* Are we connected to a docking station with vbus? */ + if (s.id_ground) { + dev_dbg(ddata->dev, "connected to a dock\n"); + + /* No VBUS needed with docks */ + error = cpcap_usb_set_usb_mode(ddata); + if (error) + goto out_err; + cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND); + + return; + } + + /* Otherwise assume we're connected to a USB host */ + dev_dbg(ddata->dev, "connected to USB host\n"); + error = cpcap_usb_set_usb_mode(ddata); + if (error) + goto out_err; + cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_VALID); + + return; + } + + cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF); + + /* Default to debug UART mode */ + error = cpcap_usb_set_uart_mode(ddata); + if (error) + goto out_err; + + dev_dbg(ddata->dev, "set UART mode\n"); + + return; + +out_err: + dev_err(ddata->dev, "error setting cable state: %i\n", error); +} + +static irqreturn_t cpcap_phy_irq_thread(int irq, void *data) +{ + struct cpcap_phy_ddata *ddata = data; + + if (!atomic_read(&ddata->active)) + return IRQ_NONE; + + schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1)); + + return IRQ_HANDLED; +} + +static int cpcap_usb_init_irq(struct platform_device *pdev, + struct cpcap_phy_ddata *ddata, + const char *name) +{ + int irq, error; + + irq = platform_get_irq_byname(pdev, name); + if (irq < 0) + return -ENODEV; + + error = devm_request_threaded_irq(ddata->dev, irq, NULL, + cpcap_phy_irq_thread, + IRQF_SHARED, + name, ddata); + if (error) { + dev_err(ddata->dev, "could not get irq %s: %i\n", + name, error); + + return error; + } + + return 0; +} + +static const char * const cpcap_phy_irqs[] = { + /* REG_INT_0 */ + "id_ground", "id_float", + + /* REG_INT1 */ + "se0conn", "vbusvld", "sessvld", "sessend", "se1", + + /* REG_INT_3 */ + "dm", "dp", +}; + +static int cpcap_usb_init_interrupts(struct platform_device *pdev, + struct cpcap_phy_ddata *ddata) +{ + int i, error; + + for (i = 0; i < ARRAY_SIZE(cpcap_phy_irqs); i++) { + error = cpcap_usb_init_irq(pdev, ddata, cpcap_phy_irqs[i]); + if (error) + return error; + } + + return 0; +} + +/* + * Optional pins and modes. At least Motorola mapphone devices + * are using two GPIOs and dynamic pinctrl to multiplex PHY pins + * to UART, ULPI or UTMI mode. + */ + +static int cpcap_usb_gpio_set_mode(struct cpcap_phy_ddata *ddata, + enum cpcap_gpio_mode mode) +{ + if (!ddata->gpio[0] || !ddata->gpio[1]) + return 0; + + gpiod_set_value(ddata->gpio[0], mode & 1); + gpiod_set_value(ddata->gpio[1], mode >> 1); + + return 0; +} + +static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata) +{ + int error; + + /* Disable lines to prevent glitches from waking up mdm6600 */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED); + if (error) + goto out_err; + + if (ddata->pins_uart) { + error = pinctrl_select_state(ddata->pins, ddata->pins_uart); + if (error) + goto out_err; + } + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1, + CPCAP_BIT_VBUSPD, + CPCAP_BIT_VBUSPD); + if (error) + goto out_err; + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2, + 0xffff, CPCAP_BIT_UARTMUX0 | + CPCAP_BIT_EMUMODE0); + if (error) + goto out_err; + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, 0x7fff, + CPCAP_BIT_IDPU_SPI); + if (error) + goto out_err; + + /* Enable UART mode */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP); + if (error) + goto out_err; + + return 0; + +out_err: + dev_err(ddata->dev, "%s failed with %i\n", __func__, error); + + return error; +} + +static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata) +{ + int error; + + /* Disable lines to prevent glitches from waking up mdm6600 */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED); + if (error) + return error; + + if (ddata->pins_utmi) { + error = pinctrl_select_state(ddata->pins, ddata->pins_utmi); + if (error) { + dev_err(ddata->dev, "could not set usb mode: %i\n", + error); + + return error; + } + } + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1, + CPCAP_BIT_VBUSPD, 0); + if (error) + goto out_err; + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2, + CPCAP_BIT_USBXCVREN, + CPCAP_BIT_USBXCVREN); + if (error) + goto out_err; + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, + CPCAP_BIT_PU_SPI | + CPCAP_BIT_DMPD_SPI | + CPCAP_BIT_DPPD_SPI | + CPCAP_BIT_SUSPEND_SPI | + CPCAP_BIT_ULPI_SPI_SEL, 0); + if (error) + goto out_err; + + error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2, + CPCAP_BIT_USBXCVREN, + CPCAP_BIT_USBXCVREN); + if (error) + goto out_err; + + /* Enable USB mode */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP); + if (error) + goto out_err; + + return 0; + +out_err: + dev_err(ddata->dev, "%s failed with %i\n", __func__, error); + + return error; +} + +static int cpcap_usb_init_optional_pins(struct cpcap_phy_ddata *ddata) +{ + ddata->pins = devm_pinctrl_get(ddata->dev); + if (IS_ERR(ddata->pins)) { + dev_info(ddata->dev, "default pins not configured: %ld\n", + PTR_ERR(ddata->pins)); + ddata->pins = NULL; + + return 0; + } + + ddata->pins_ulpi = pinctrl_lookup_state(ddata->pins, "ulpi"); + if (IS_ERR(ddata->pins_ulpi)) { + dev_info(ddata->dev, "ulpi pins not configured\n"); + ddata->pins_ulpi = NULL; + } + + ddata->pins_utmi = pinctrl_lookup_state(ddata->pins, "utmi"); + if (IS_ERR(ddata->pins_utmi)) { + dev_info(ddata->dev, "utmi pins not configured\n"); + ddata->pins_utmi = NULL; + } + + ddata->pins_uart = pinctrl_lookup_state(ddata->pins, "uart"); + if (IS_ERR(ddata->pins_uart)) { + dev_info(ddata->dev, "uart pins not configured\n"); + ddata->pins_uart = NULL; + } + + if (ddata->pins_uart) + return pinctrl_select_state(ddata->pins, ddata->pins_uart); + + return 0; +} + +static void cpcap_usb_init_optional_gpios(struct cpcap_phy_ddata *ddata) +{ + int i; + + for (i = 0; i < 2; i++) { + ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode", + i, GPIOD_OUT_HIGH); + if (IS_ERR(ddata->gpio[i])) { + dev_info(ddata->dev, "no mode change GPIO%i: %li\n", + i, PTR_ERR(ddata->gpio[i])); + ddata->gpio[i] = NULL; + } + } +} + +static int cpcap_usb_init_iio(struct cpcap_phy_ddata *ddata) +{ + enum iio_chan_type type; + int error; + + ddata->vbus = devm_iio_channel_get(ddata->dev, "vbus"); + if (IS_ERR(ddata->vbus)) { + error = PTR_ERR(ddata->vbus); + goto out_err; + } + + if (!ddata->vbus->indio_dev) { + error = -ENXIO; + goto out_err; + } + + error = iio_get_channel_type(ddata->vbus, &type); + if (error < 0) + goto out_err; + + if (type != IIO_VOLTAGE) { + error = -EINVAL; + goto out_err; + } + + return 0; + +out_err: + dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n", + error); + + return error; +} + +#ifdef CONFIG_OF +static const struct of_device_id cpcap_usb_phy_id_table[] = { + { + .compatible = "motorola,cpcap-usb-phy", + }, + { + .compatible = "motorola,mapphone-cpcap-usb-phy", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, cpcap_usb_phy_id_table); +#endif + +static int cpcap_usb_phy_probe(struct platform_device *pdev) +{ + struct cpcap_phy_ddata *ddata; + struct phy *generic_phy; + struct phy_provider *phy_provider; + struct usb_otg *otg; + const struct of_device_id *of_id; + int error; + + of_id = of_match_device(of_match_ptr(cpcap_usb_phy_id_table), + &pdev->dev); + if (!of_id) + return -EINVAL; + + ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + ddata->reg = dev_get_regmap(pdev->dev.parent, NULL); + if (!ddata->reg) + return -ENODEV; + + otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); + if (!otg) + return -ENOMEM; + + ddata->dev = &pdev->dev; + ddata->phy.dev = ddata->dev; + ddata->phy.label = "cpcap_usb_phy"; + ddata->phy.otg = otg; + ddata->phy.type = USB_PHY_TYPE_USB2; + otg->set_host = cpcap_usb_phy_set_host; + otg->set_peripheral = cpcap_usb_phy_set_peripheral; + otg->usb_phy = &ddata->phy; + INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect); + platform_set_drvdata(pdev, ddata); + + ddata->vusb = devm_regulator_get(&pdev->dev, "vusb"); + if (IS_ERR(ddata->vusb)) + return PTR_ERR(ddata->vusb); + + error = regulator_enable(ddata->vusb); + if (error) + return error; + + generic_phy = devm_phy_create(ddata->dev, NULL, &ops); + if (IS_ERR(generic_phy)) { + error = PTR_ERR(generic_phy); + goto out_reg_disable; + } + + phy_set_drvdata(generic_phy, ddata); + + phy_provider = devm_of_phy_provider_register(ddata->dev, + of_phy_simple_xlate); + if (IS_ERR(phy_provider)) { + error = PTR_ERR(phy_provider); + goto out_reg_disable; + } + + error = cpcap_usb_init_optional_pins(ddata); + if (error) + goto out_reg_disable; + + cpcap_usb_init_optional_gpios(ddata); + + error = cpcap_usb_init_iio(ddata); + if (error) + goto out_reg_disable; + + error = cpcap_usb_init_interrupts(pdev, ddata); + if (error) + goto out_reg_disable; + + usb_add_phy_dev(&ddata->phy); + atomic_set(&ddata->active, 1); + schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1)); + + return 0; + +out_reg_disable: + regulator_disable(ddata->vusb); + + return error; +} + +static int cpcap_usb_phy_remove(struct platform_device *pdev) +{ + struct cpcap_phy_ddata *ddata = platform_get_drvdata(pdev); + int error; + + atomic_set(&ddata->active, 0); + error = cpcap_usb_set_uart_mode(ddata); + if (error) + dev_err(ddata->dev, "could not set UART mode\n"); + + cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF); + + usb_remove_phy(&ddata->phy); + cancel_delayed_work_sync(&ddata->detect_work); + clk_unprepare(ddata->refclk); + regulator_disable(ddata->vusb); + + return 0; +} + +static struct platform_driver cpcap_usb_phy_driver = { + .probe = cpcap_usb_phy_probe, + .remove = cpcap_usb_phy_remove, + .driver = { + .name = "cpcap-usb-phy", + .of_match_table = of_match_ptr(cpcap_usb_phy_id_table), + }, +}; + +module_platform_driver(cpcap_usb_phy_driver); + +MODULE_ALIAS("platform:cpcap_usb"); +MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); +MODULE_DESCRIPTION("CPCAP usb phy driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c new file mode 100644 index 000000000..77518010a --- /dev/null +++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c @@ -0,0 +1,648 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Motorola Mapphone MDM6600 modem GPIO controlled USB PHY driver + * Copyright (C) 2018 Tony Lindgren <tony@atomide.com> + */ + +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <linux/gpio/consumer.h> +#include <linux/of_platform.h> +#include <linux/phy/phy.h> + +#define PHY_MDM6600_PHY_DELAY_MS 4000 /* PHY enable 2.2s to 3.5s */ +#define PHY_MDM6600_ENABLED_DELAY_MS 8000 /* 8s more total for MDM6600 */ +#define PHY_MDM6600_WAKE_KICK_MS 600 /* time on after GPIO toggle */ +#define MDM6600_MODEM_IDLE_DELAY_MS 1000 /* modem after USB suspend */ +#define MDM6600_MODEM_WAKE_DELAY_MS 200 /* modem response after idle */ + +enum phy_mdm6600_ctrl_lines { + PHY_MDM6600_ENABLE, /* USB PHY enable */ + PHY_MDM6600_POWER, /* Device power */ + PHY_MDM6600_RESET, /* Device reset */ + PHY_MDM6600_NR_CTRL_LINES, +}; + +enum phy_mdm6600_bootmode_lines { + PHY_MDM6600_MODE0, /* out USB mode0 and OOB wake */ + PHY_MDM6600_MODE1, /* out USB mode1, in OOB wake */ + PHY_MDM6600_NR_MODE_LINES, +}; + +enum phy_mdm6600_cmd_lines { + PHY_MDM6600_CMD0, + PHY_MDM6600_CMD1, + PHY_MDM6600_CMD2, + PHY_MDM6600_NR_CMD_LINES, +}; + +enum phy_mdm6600_status_lines { + PHY_MDM6600_STATUS0, + PHY_MDM6600_STATUS1, + PHY_MDM6600_STATUS2, + PHY_MDM6600_NR_STATUS_LINES, +}; + +/* + * MDM6600 command codes. These are based on Motorola Mapphone Linux + * kernel tree. + */ +enum phy_mdm6600_cmd { + PHY_MDM6600_CMD_BP_PANIC_ACK, + PHY_MDM6600_CMD_DATA_ONLY_BYPASS, /* Reroute USB to CPCAP PHY */ + PHY_MDM6600_CMD_FULL_BYPASS, /* Reroute USB to CPCAP PHY */ + PHY_MDM6600_CMD_NO_BYPASS, /* Request normal USB mode */ + PHY_MDM6600_CMD_BP_SHUTDOWN_REQ, /* Request device power off */ + PHY_MDM6600_CMD_BP_UNKNOWN_5, + PHY_MDM6600_CMD_BP_UNKNOWN_6, + PHY_MDM6600_CMD_UNDEFINED, +}; + +/* + * MDM6600 status codes. These are based on Motorola Mapphone Linux + * kernel tree. + */ +enum phy_mdm6600_status { + PHY_MDM6600_STATUS_PANIC, /* Seems to be really off */ + PHY_MDM6600_STATUS_PANIC_BUSY_WAIT, + PHY_MDM6600_STATUS_QC_DLOAD, + PHY_MDM6600_STATUS_RAM_DOWNLOADER, /* MDM6600 USB flashing mode */ + PHY_MDM6600_STATUS_PHONE_CODE_AWAKE, /* MDM6600 normal USB mode */ + PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP, + PHY_MDM6600_STATUS_SHUTDOWN_ACK, + PHY_MDM6600_STATUS_UNDEFINED, +}; + +static const char * const +phy_mdm6600_status_name[] = { + "off", "busy", "qc_dl", "ram_dl", "awake", + "asleep", "shutdown", "undefined", +}; + +struct phy_mdm6600 { + struct device *dev; + struct phy *generic_phy; + struct phy_provider *phy_provider; + struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES]; + struct gpio_descs *mode_gpios; + struct gpio_descs *status_gpios; + struct gpio_descs *cmd_gpios; + struct delayed_work bootup_work; + struct delayed_work status_work; + struct delayed_work modem_wake_work; + struct completion ack; + bool enabled; /* mdm6600 phy enabled */ + bool running; /* mdm6600 boot done */ + bool awake; /* mdm6600 respnds on n_gsm */ + int status; +}; + +static int phy_mdm6600_init(struct phy *x) +{ + struct phy_mdm6600 *ddata = phy_get_drvdata(x); + struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE]; + + if (!ddata->enabled) + return -EPROBE_DEFER; + + gpiod_set_value_cansleep(enable_gpio, 0); + + return 0; +} + +static int phy_mdm6600_power_on(struct phy *x) +{ + struct phy_mdm6600 *ddata = phy_get_drvdata(x); + struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE]; + + if (!ddata->enabled) + return -ENODEV; + + gpiod_set_value_cansleep(enable_gpio, 1); + + return 0; +} + +static int phy_mdm6600_power_off(struct phy *x) +{ + struct phy_mdm6600 *ddata = phy_get_drvdata(x); + struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE]; + + if (!ddata->enabled) + return -ENODEV; + + gpiod_set_value_cansleep(enable_gpio, 0); + + return 0; +} + +static const struct phy_ops gpio_usb_ops = { + .init = phy_mdm6600_init, + .power_on = phy_mdm6600_power_on, + .power_off = phy_mdm6600_power_off, + .owner = THIS_MODULE, +}; + +/** + * phy_mdm6600_cmd() - send a command request to mdm6600 + * @ddata: device driver data + * + * Configures the three command request GPIOs to the specified value. + */ +static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val) +{ + int values[PHY_MDM6600_NR_CMD_LINES]; + int i; + + val &= (1 << PHY_MDM6600_NR_CMD_LINES) - 1; + for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++) + values[i] = (val & BIT(i)) >> i; + + gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES, + ddata->cmd_gpios->desc, values); +} + +/** + * phy_mdm6600_status() - read mdm6600 status lines + * @ddata: device driver data + */ +static void phy_mdm6600_status(struct work_struct *work) +{ + struct phy_mdm6600 *ddata; + struct device *dev; + int values[PHY_MDM6600_NR_STATUS_LINES]; + int error, i, val = 0; + + ddata = container_of(work, struct phy_mdm6600, status_work.work); + dev = ddata->dev; + + error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES, + ddata->status_gpios->desc, + values); + if (error) + return; + + for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) { + val |= values[i] << i; + dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n", + __func__, i, values[i], val); + } + ddata->status = val; + + dev_info(dev, "modem status: %i %s\n", + ddata->status, + phy_mdm6600_status_name[ddata->status & 7]); + complete(&ddata->ack); +} + +static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data) +{ + struct phy_mdm6600 *ddata = data; + + schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10)); + + return IRQ_HANDLED; +} + +/** + * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting + * @irq: interrupt + * @data: interrupt handler data + * + * GPIO mode1 is used initially as output to configure the USB boot + * mode for mdm6600. After booting it is used as input for OOB wake + * signal from mdm6600 to the SoC. Just use it for debug info only + * for now. + */ +static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data) +{ + struct phy_mdm6600 *ddata = data; + struct gpio_desc *mode_gpio1; + int error, wakeup; + + mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1]; + wakeup = gpiod_get_value(mode_gpio1); + if (!wakeup) + return IRQ_NONE; + + dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n", wakeup); + error = pm_runtime_get_sync(ddata->dev); + if (error < 0) { + pm_runtime_put_noidle(ddata->dev); + + return IRQ_NONE; + } + + /* Just wake-up and kick the autosuspend timer */ + pm_runtime_mark_last_busy(ddata->dev); + pm_runtime_put_autosuspend(ddata->dev); + + return IRQ_HANDLED; +} + +/** + * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines + * @ddata: device driver data + */ +static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata) +{ + struct device *dev = ddata->dev; + int i, error, irq; + + for (i = PHY_MDM6600_STATUS0; + i <= PHY_MDM6600_STATUS2; i++) { + struct gpio_desc *gpio = ddata->status_gpios->desc[i]; + + irq = gpiod_to_irq(gpio); + if (irq <= 0) + continue; + + error = devm_request_threaded_irq(dev, irq, NULL, + phy_mdm6600_irq_thread, + IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + "mdm6600", + ddata); + if (error) + dev_warn(dev, "no modem status irq%i: %i\n", + irq, error); + } +} + +struct phy_mdm6600_map { + const char *name; + int direction; +}; + +static const struct phy_mdm6600_map +phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = { + { "enable", GPIOD_OUT_LOW, }, /* low = phy disabled */ + { "power", GPIOD_OUT_LOW, }, /* low = off */ + { "reset", GPIOD_OUT_HIGH, }, /* high = reset */ +}; + +/** + * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines + * @ddata: device driver data + */ +static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata) +{ + struct device *dev = ddata->dev; + int i; + + /* MDM6600 control lines */ + for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) { + const struct phy_mdm6600_map *map = + &phy_mdm6600_ctrl_gpio_map[i]; + struct gpio_desc **gpio = &ddata->ctrl_gpios[i]; + + *gpio = devm_gpiod_get(dev, map->name, map->direction); + if (IS_ERR(*gpio)) { + dev_info(dev, "gpio %s error %li\n", + map->name, PTR_ERR(*gpio)); + return PTR_ERR(*gpio); + } + } + + /* MDM6600 USB start-up mode output lines */ + ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode", + GPIOD_OUT_LOW); + if (IS_ERR(ddata->mode_gpios)) + return PTR_ERR(ddata->mode_gpios); + + if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES) + return -EINVAL; + + /* MDM6600 status input lines */ + ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status", + GPIOD_IN); + if (IS_ERR(ddata->status_gpios)) + return PTR_ERR(ddata->status_gpios); + + if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES) + return -EINVAL; + + /* MDM6600 cmd output lines */ + ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd", + GPIOD_OUT_LOW); + if (IS_ERR(ddata->cmd_gpios)) + return PTR_ERR(ddata->cmd_gpios); + + if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES) + return -EINVAL; + + return 0; +} + +/** + * phy_mdm6600_device_power_on() - power on mdm6600 device + * @ddata: device driver data + * + * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure + * the shared USB bootmode GPIOs are configured, then request modem start-up, + * reset and power-up.. And then we need to recycle the shared USB bootmode + * GPIOs as they are also used for Out of Band (OOB) wake for the USB and + * TS 27.010 serial mux. + */ +static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata) +{ + struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio; + int error = 0, wakeirq; + + mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0]; + mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1]; + reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET]; + power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER]; + + /* + * Shared GPIOs must be low for normal USB mode. After booting + * they are used for OOB wake signaling. These can be also used + * to configure USB flashing mode later on based on a module + * parameter. + */ + gpiod_set_value_cansleep(mode_gpio0, 0); + gpiod_set_value_cansleep(mode_gpio1, 0); + + /* Request start-up mode */ + phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS); + + /* Request a reset first */ + gpiod_set_value_cansleep(reset_gpio, 0); + msleep(100); + + /* Toggle power GPIO to request mdm6600 to start */ + gpiod_set_value_cansleep(power_gpio, 1); + msleep(100); + gpiod_set_value_cansleep(power_gpio, 0); + + /* + * Looks like the USB PHY needs between 2.2 to 4 seconds. + * If we try to use it before that, we will get L3 errors + * from omap-usb-host trying to access the PHY. See also + * phy_mdm6600_init() for -EPROBE_DEFER. + */ + msleep(PHY_MDM6600_PHY_DELAY_MS); + ddata->enabled = true; + + /* Booting up the rest of MDM6600 will take total about 8 seconds */ + dev_info(ddata->dev, "Waiting for power up request to complete..\n"); + if (wait_for_completion_timeout(&ddata->ack, + msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) { + if (ddata->status > PHY_MDM6600_STATUS_PANIC && + ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK) + dev_info(ddata->dev, "Powered up OK\n"); + } else { + ddata->enabled = false; + error = -ETIMEDOUT; + dev_err(ddata->dev, "Timed out powering up\n"); + } + + /* Reconfigure mode1 GPIO as input for OOB wake */ + gpiod_direction_input(mode_gpio1); + + wakeirq = gpiod_to_irq(mode_gpio1); + if (wakeirq <= 0) + return wakeirq; + + error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL, + phy_mdm6600_wakeirq_thread, + IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + "mdm6600-wake", + ddata); + if (error) + dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n", + wakeirq, error); + + ddata->running = true; + + return error; +} + +/** + * phy_mdm6600_device_power_off() - power off mdm6600 device + * @ddata: device driver data + */ +static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata) +{ + struct gpio_desc *reset_gpio = + ddata->ctrl_gpios[PHY_MDM6600_RESET]; + + ddata->enabled = false; + phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ); + msleep(100); + + gpiod_set_value_cansleep(reset_gpio, 1); + + dev_info(ddata->dev, "Waiting for power down request to complete.. "); + if (wait_for_completion_timeout(&ddata->ack, + msecs_to_jiffies(5000))) { + if (ddata->status == PHY_MDM6600_STATUS_PANIC) + dev_info(ddata->dev, "Powered down OK\n"); + } else { + dev_err(ddata->dev, "Timed out powering down\n"); + } +} + +static void phy_mdm6600_deferred_power_on(struct work_struct *work) +{ + struct phy_mdm6600 *ddata; + int error; + + ddata = container_of(work, struct phy_mdm6600, bootup_work.work); + + error = phy_mdm6600_device_power_on(ddata); + if (error) + dev_err(ddata->dev, "Device not functional\n"); +} + +/* + * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps, + * we need to keep the modem awake by kicking it's mode0 GPIO. This will + * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using + * the modem, runtime PM auto mode can be enabled so modem can enter low + * power mode. + */ +static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata) +{ + struct gpio_desc *mode_gpio0; + + mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0]; + gpiod_set_value_cansleep(mode_gpio0, 1); + usleep_range(5, 15); + gpiod_set_value_cansleep(mode_gpio0, 0); + if (ddata->awake) + usleep_range(5, 15); + else + msleep(MDM6600_MODEM_WAKE_DELAY_MS); +} + +static void phy_mdm6600_modem_wake(struct work_struct *work) +{ + struct phy_mdm6600 *ddata; + + ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work); + phy_mdm6600_wake_modem(ddata); + + /* + * The modem does not always stay awake 1.2 seconds after toggling + * the wake GPIO, and sometimes it idles after about some 600 ms + * making writes time out. + */ + schedule_delayed_work(&ddata->modem_wake_work, + msecs_to_jiffies(PHY_MDM6600_WAKE_KICK_MS)); +} + +static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev) +{ + struct phy_mdm6600 *ddata = dev_get_drvdata(dev); + + cancel_delayed_work_sync(&ddata->modem_wake_work); + ddata->awake = false; + + return 0; +} + +static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev) +{ + struct phy_mdm6600 *ddata = dev_get_drvdata(dev); + + phy_mdm6600_modem_wake(&ddata->modem_wake_work.work); + ddata->awake = true; + + return 0; +} + +static const struct dev_pm_ops phy_mdm6600_pm_ops = { + SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend, + phy_mdm6600_runtime_resume, NULL) +}; + +static const struct of_device_id phy_mdm6600_id_table[] = { + { .compatible = "motorola,mapphone-mdm6600", }, + {}, +}; +MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table); + +static int phy_mdm6600_probe(struct platform_device *pdev) +{ + struct phy_mdm6600 *ddata; + int error; + + ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + INIT_DELAYED_WORK(&ddata->bootup_work, + phy_mdm6600_deferred_power_on); + INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status); + INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake); + 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); + + /* + * Enable PM runtime only after PHY has been powered up properly. + * It is currently only needed after USB suspends mdm6600 and n_gsm + * needs to access the device. We don't want to do this earlier as + * gpio mode0 pin doubles as mdm6600 wake-up gpio. + */ + pm_runtime_use_autosuspend(ddata->dev); + pm_runtime_set_autosuspend_delay(ddata->dev, + MDM6600_MODEM_IDLE_DELAY_MS); + pm_runtime_enable(ddata->dev); + error = pm_runtime_get_sync(ddata->dev); + if (error < 0) { + dev_warn(ddata->dev, "failed to wake modem: %i\n", error); + pm_runtime_put_noidle(ddata->dev); + } + pm_runtime_mark_last_busy(ddata->dev); + pm_runtime_put_autosuspend(ddata->dev); + + 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]; + + pm_runtime_dont_use_autosuspend(ddata->dev); + pm_runtime_put_sync(ddata->dev); + pm_runtime_disable(ddata->dev); + + 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->modem_wake_work); + 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", + .pm = &phy_mdm6600_pm_ops, + .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"); |