/* * 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 #include #include #include #include #include #include #include #include #include #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_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; return usb3503_probe(hub); } #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, .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, }; static int __init usb3503_init(void) { int err; err = i2c_register_driver(THIS_MODULE, &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 "); MODULE_DESCRIPTION("USB3503 USB HUB driver"); MODULE_LICENSE("GPL");