| /* | |
| * Driver for SMSC USB3503 USB 2.0 hub controller driver | |
| * | |
| * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com) | |
| * | |
| * 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; either version 2 of the License, or | |
| * (at your option) any later version. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program; if not, write to the Free Software | |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| */ | |
| #include <linux/clk.h> | |
| #include <linux/i2c.h> | |
| #include <linux/gpio.h> | |
| #include <linux/delay.h> | |
| #include <linux/slab.h> | |
| #include <linux/module.h> | |
| #include <linux/of_gpio.h> | |
| #include <linux/platform_device.h> | |
| #include <linux/platform_data/usb3503.h> | |
| #include <linux/regmap.h> | |
| #define USB3503_VIDL 0x00 | |
| #define USB3503_VIDM 0x01 | |
| #define USB3503_PIDL 0x02 | |
| #define USB3503_PIDM 0x03 | |
| #define USB3503_DIDL 0x04 | |
| #define USB3503_DIDM 0x05 | |
| #define USB3503_CFG1 0x06 | |
| #define USB3503_SELF_BUS_PWR (1 << 7) | |
| #define USB3503_CFG2 0x07 | |
| #define USB3503_CFG3 0x08 | |
| #define USB3503_NRD 0x09 | |
| #define USB3503_PDS 0x0a | |
| #define USB3503_SP_ILOCK 0xe7 | |
| #define USB3503_SPILOCK_CONNECT (1 << 1) | |
| #define USB3503_SPILOCK_CONFIG (1 << 0) | |
| #define USB3503_CFGP 0xee | |
| #define USB3503_CLKSUSP (1 << 7) | |
| #define USB3503_RESET 0xff | |
| struct usb3503 { | |
| enum usb3503_mode mode; | |
| struct regmap *regmap; | |
| struct device *dev; | |
| struct clk *clk; | |
| u8 port_off_mask; | |
| int gpio_intn; | |
| int gpio_reset; | |
| int gpio_connect; | |
| bool secondary_ref_clk; | |
| }; | |
| static int usb3503_reset(struct usb3503 *hub, int state) | |
| { | |
| if (!state && gpio_is_valid(hub->gpio_connect)) | |
| gpio_set_value_cansleep(hub->gpio_connect, 0); | |
| if (gpio_is_valid(hub->gpio_reset)) | |
| gpio_set_value_cansleep(hub->gpio_reset, state); | |
| /* Wait T_HUBINIT == 4ms for hub logic to stabilize */ | |
| if (state) | |
| usleep_range(4000, 10000); | |
| return 0; | |
| } | |
| static int usb3503_connect(struct usb3503 *hub) | |
| { | |
| struct device *dev = hub->dev; | |
| int err; | |
| usb3503_reset(hub, 1); | |
| if (hub->regmap) { | |
| /* SP_ILOCK: set connect_n, config_n for config */ | |
| err = regmap_write(hub->regmap, USB3503_SP_ILOCK, | |
| (USB3503_SPILOCK_CONNECT | |
| | USB3503_SPILOCK_CONFIG)); | |
| if (err < 0) { | |
| dev_err(dev, "SP_ILOCK failed (%d)\n", err); | |
| return err; | |
| } | |
| /* PDS : Set the ports which are disabled in self-powered mode. */ | |
| if (hub->port_off_mask) { | |
| err = regmap_update_bits(hub->regmap, USB3503_PDS, | |
| hub->port_off_mask, | |
| hub->port_off_mask); | |
| if (err < 0) { | |
| dev_err(dev, "PDS failed (%d)\n", err); | |
| return err; | |
| } | |
| } | |
| /* CFG1 : Set SELF_BUS_PWR, this enables self-powered operation. */ | |
| err = regmap_update_bits(hub->regmap, USB3503_CFG1, | |
| USB3503_SELF_BUS_PWR, | |
| USB3503_SELF_BUS_PWR); | |
| if (err < 0) { | |
| dev_err(dev, "CFG1 failed (%d)\n", err); | |
| return err; | |
| } | |
| /* SP_LOCK: clear connect_n, config_n for hub connect */ | |
| err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK, | |
| (USB3503_SPILOCK_CONNECT | |
| | USB3503_SPILOCK_CONFIG), 0); | |
| if (err < 0) { | |
| dev_err(dev, "SP_ILOCK failed (%d)\n", err); | |
| return err; | |
| } | |
| } | |
| if (gpio_is_valid(hub->gpio_connect)) | |
| gpio_set_value_cansleep(hub->gpio_connect, 1); | |
| hub->mode = USB3503_MODE_HUB; | |
| dev_info(dev, "switched to HUB mode\n"); | |
| return 0; | |
| } | |
| static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode) | |
| { | |
| struct device *dev = hub->dev; | |
| int err = 0; | |
| switch (mode) { | |
| case USB3503_MODE_HUB: | |
| err = usb3503_connect(hub); | |
| break; | |
| case USB3503_MODE_STANDBY: | |
| usb3503_reset(hub, 0); | |
| dev_info(dev, "switched to STANDBY mode\n"); | |
| break; | |
| default: | |
| dev_err(dev, "unknown mode is requested\n"); | |
| err = -EINVAL; | |
| break; | |
| } | |
| return err; | |
| } | |
| static const struct regmap_config usb3503_regmap_config = { | |
| .reg_bits = 8, | |
| .val_bits = 8, | |
| .max_register = USB3503_RESET, | |
| }; | |
| static int usb3503_probe(struct usb3503 *hub) | |
| { | |
| struct device *dev = hub->dev; | |
| struct usb3503_platform_data *pdata = dev_get_platdata(dev); | |
| struct device_node *np = dev->of_node; | |
| int err; | |
| u32 mode = USB3503_MODE_HUB; | |
| const u32 *property; | |
| int len; | |
| if (pdata) { | |
| hub->port_off_mask = pdata->port_off_mask; | |
| hub->gpio_intn = pdata->gpio_intn; | |
| hub->gpio_connect = pdata->gpio_connect; | |
| hub->gpio_reset = pdata->gpio_reset; | |
| hub->mode = pdata->initial_mode; | |
| } else if (np) { | |
| struct clk *clk; | |
| u32 rate = 0; | |
| hub->port_off_mask = 0; | |
| if (!of_property_read_u32(np, "refclk-frequency", &rate)) { | |
| switch (rate) { | |
| case 38400000: | |
| case 26000000: | |
| case 19200000: | |
| case 12000000: | |
| hub->secondary_ref_clk = 0; | |
| break; | |
| case 24000000: | |
| case 27000000: | |
| case 25000000: | |
| case 50000000: | |
| hub->secondary_ref_clk = 1; | |
| break; | |
| default: | |
| dev_err(dev, | |
| "unsupported reference clock rate (%d)\n", | |
| (int) rate); | |
| return -EINVAL; | |
| } | |
| } | |
| clk = devm_clk_get(dev, "refclk"); | |
| if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) { | |
| dev_err(dev, "unable to request refclk (%ld)\n", | |
| PTR_ERR(clk)); | |
| return PTR_ERR(clk); | |
| } | |
| if (!IS_ERR(clk)) { | |
| hub->clk = clk; | |
| if (rate != 0) { | |
| err = clk_set_rate(hub->clk, rate); | |
| if (err) { | |
| dev_err(dev, | |
| "unable to set reference clock rate to %d\n", | |
| (int) rate); | |
| return err; | |
| } | |
| } | |
| err = clk_prepare_enable(hub->clk); | |
| if (err) { | |
| dev_err(dev, | |
| "unable to enable reference clock\n"); | |
| return err; | |
| } | |
| } | |
| property = of_get_property(np, "disabled-ports", &len); | |
| if (property && (len / sizeof(u32)) > 0) { | |
| int i; | |
| for (i = 0; i < len / sizeof(u32); i++) { | |
| u32 port = be32_to_cpu(property[i]); | |
| if ((1 <= port) && (port <= 3)) | |
| hub->port_off_mask |= (1 << port); | |
| } | |
| } | |
| hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0); | |
| if (hub->gpio_intn == -EPROBE_DEFER) | |
| return -EPROBE_DEFER; | |
| hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0); | |
| if (hub->gpio_connect == -EPROBE_DEFER) | |
| return -EPROBE_DEFER; | |
| hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0); | |
| if (hub->gpio_reset == -EPROBE_DEFER) | |
| return -EPROBE_DEFER; | |
| of_property_read_u32(np, "initial-mode", &mode); | |
| hub->mode = mode; | |
| } | |
| if (hub->port_off_mask && !hub->regmap) | |
| dev_err(dev, "Ports disabled with no control interface\n"); | |
| if (gpio_is_valid(hub->gpio_intn)) { | |
| int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW : | |
| GPIOF_OUT_INIT_HIGH; | |
| err = devm_gpio_request_one(dev, hub->gpio_intn, val, | |
| "usb3503 intn"); | |
| if (err) { | |
| dev_err(dev, | |
| "unable to request GPIO %d as interrupt pin (%d)\n", | |
| hub->gpio_intn, err); | |
| return err; | |
| } | |
| } | |
| if (gpio_is_valid(hub->gpio_connect)) { | |
| err = devm_gpio_request_one(dev, hub->gpio_connect, | |
| GPIOF_OUT_INIT_LOW, "usb3503 connect"); | |
| if (err) { | |
| dev_err(dev, | |
| "unable to request GPIO %d as connect pin (%d)\n", | |
| hub->gpio_connect, err); | |
| return err; | |
| } | |
| } | |
| if (gpio_is_valid(hub->gpio_reset)) { | |
| err = devm_gpio_request_one(dev, hub->gpio_reset, | |
| GPIOF_OUT_INIT_LOW, "usb3503 reset"); | |
| /* Datasheet defines a hardware reset to be at least 100us */ | |
| usleep_range(100, 10000); | |
| if (err) { | |
| dev_err(dev, | |
| "unable to request GPIO %d as reset pin (%d)\n", | |
| hub->gpio_reset, err); | |
| return err; | |
| } | |
| } | |
| usb3503_switch_mode(hub, hub->mode); | |
| dev_info(dev, "%s: probed in %s mode\n", __func__, | |
| (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby"); | |
| return 0; | |
| } | |
| static int usb3503_i2c_probe(struct i2c_client *i2c, | |
| const struct i2c_device_id *id) | |
| { | |
| struct usb3503 *hub; | |
| int err; | |
| hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL); | |
| if (!hub) | |
| return -ENOMEM; | |
| i2c_set_clientdata(i2c, hub); | |
| hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config); | |
| if (IS_ERR(hub->regmap)) { | |
| err = PTR_ERR(hub->regmap); | |
| dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err); | |
| return err; | |
| } | |
| hub->dev = &i2c->dev; | |
| return usb3503_probe(hub); | |
| } | |
| static int usb3503_i2c_remove(struct i2c_client *i2c) | |
| { | |
| struct usb3503 *hub; | |
| hub = i2c_get_clientdata(i2c); | |
| if (hub->clk) | |
| clk_disable_unprepare(hub->clk); | |
| return 0; | |
| } | |
| static int usb3503_platform_probe(struct platform_device *pdev) | |
| { | |
| struct usb3503 *hub; | |
| hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL); | |
| if (!hub) | |
| return -ENOMEM; | |
| hub->dev = &pdev->dev; | |
| platform_set_drvdata(pdev, hub); | |
| return usb3503_probe(hub); | |
| } | |
| static int usb3503_platform_remove(struct platform_device *pdev) | |
| { | |
| struct usb3503 *hub; | |
| hub = platform_get_drvdata(pdev); | |
| if (hub->clk) | |
| clk_disable_unprepare(hub->clk); | |
| return 0; | |
| } | |
| #ifdef CONFIG_PM_SLEEP | |
| static int usb3503_i2c_suspend(struct device *dev) | |
| { | |
| struct i2c_client *client = to_i2c_client(dev); | |
| struct usb3503 *hub = i2c_get_clientdata(client); | |
| usb3503_switch_mode(hub, USB3503_MODE_STANDBY); | |
| if (hub->clk) | |
| clk_disable_unprepare(hub->clk); | |
| return 0; | |
| } | |
| static int usb3503_i2c_resume(struct device *dev) | |
| { | |
| struct i2c_client *client = to_i2c_client(dev); | |
| struct usb3503 *hub = i2c_get_clientdata(client); | |
| if (hub->clk) | |
| clk_prepare_enable(hub->clk); | |
| usb3503_switch_mode(hub, hub->mode); | |
| return 0; | |
| } | |
| #endif | |
| static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend, | |
| usb3503_i2c_resume); | |
| static const struct i2c_device_id usb3503_id[] = { | |
| { USB3503_I2C_NAME, 0 }, | |
| { } | |
| }; | |
| MODULE_DEVICE_TABLE(i2c, usb3503_id); | |
| #ifdef CONFIG_OF | |
| static const struct of_device_id usb3503_of_match[] = { | |
| { .compatible = "smsc,usb3503", }, | |
| { .compatible = "smsc,usb3503a", }, | |
| {}, | |
| }; | |
| MODULE_DEVICE_TABLE(of, usb3503_of_match); | |
| #endif | |
| static struct i2c_driver usb3503_i2c_driver = { | |
| .driver = { | |
| .name = USB3503_I2C_NAME, | |
| .pm = &usb3503_i2c_pm_ops, | |
| .of_match_table = of_match_ptr(usb3503_of_match), | |
| }, | |
| .probe = usb3503_i2c_probe, | |
| .remove = usb3503_i2c_remove, | |
| .id_table = usb3503_id, | |
| }; | |
| static struct platform_driver usb3503_platform_driver = { | |
| .driver = { | |
| .name = USB3503_I2C_NAME, | |
| .of_match_table = of_match_ptr(usb3503_of_match), | |
| }, | |
| .probe = usb3503_platform_probe, | |
| .remove = usb3503_platform_remove, | |
| }; | |
| static int __init usb3503_init(void) | |
| { | |
| int err; | |
| err = i2c_add_driver(&usb3503_i2c_driver); | |
| if (err != 0) | |
| pr_err("usb3503: Failed to register I2C driver: %d\n", err); | |
| err = platform_driver_register(&usb3503_platform_driver); | |
| if (err != 0) | |
| pr_err("usb3503: Failed to register platform driver: %d\n", | |
| err); | |
| return 0; | |
| } | |
| module_init(usb3503_init); | |
| static void __exit usb3503_exit(void) | |
| { | |
| platform_driver_unregister(&usb3503_platform_driver); | |
| i2c_del_driver(&usb3503_i2c_driver); | |
| } | |
| module_exit(usb3503_exit); | |
| MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>"); | |
| MODULE_DESCRIPTION("USB3503 USB HUB driver"); | |
| MODULE_LICENSE("GPL"); |