435 lines
10 KiB
C
435 lines
10 KiB
C
/*
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* Driver for SMSC USB3503 USB 2.0 hub controller driver
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*
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* Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/clk.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/usb3503.h>
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#include <linux/regmap.h>
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#define USB3503_VIDL 0x00
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#define USB3503_VIDM 0x01
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#define USB3503_PIDL 0x02
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#define USB3503_PIDM 0x03
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#define USB3503_DIDL 0x04
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#define USB3503_DIDM 0x05
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#define USB3503_CFG1 0x06
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#define USB3503_SELF_BUS_PWR (1 << 7)
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#define USB3503_CFG2 0x07
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#define USB3503_CFG3 0x08
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#define USB3503_NRD 0x09
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#define USB3503_PDS 0x0a
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#define USB3503_SP_ILOCK 0xe7
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#define USB3503_SPILOCK_CONNECT (1 << 1)
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#define USB3503_SPILOCK_CONFIG (1 << 0)
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#define USB3503_CFGP 0xee
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#define USB3503_CLKSUSP (1 << 7)
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#define USB3503_RESET 0xff
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struct usb3503 {
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enum usb3503_mode mode;
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struct regmap *regmap;
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struct device *dev;
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struct clk *clk;
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u8 port_off_mask;
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int gpio_intn;
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int gpio_reset;
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int gpio_connect;
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bool secondary_ref_clk;
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};
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static int usb3503_reset(struct usb3503 *hub, int state)
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{
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if (!state && gpio_is_valid(hub->gpio_connect))
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gpio_set_value_cansleep(hub->gpio_connect, 0);
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if (gpio_is_valid(hub->gpio_reset))
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gpio_set_value_cansleep(hub->gpio_reset, state);
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/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
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if (state)
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usleep_range(4000, 10000);
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return 0;
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}
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static int usb3503_connect(struct usb3503 *hub)
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{
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struct device *dev = hub->dev;
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int err;
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usb3503_reset(hub, 1);
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if (hub->regmap) {
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/* SP_ILOCK: set connect_n, config_n for config */
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err = regmap_write(hub->regmap, USB3503_SP_ILOCK,
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(USB3503_SPILOCK_CONNECT
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| USB3503_SPILOCK_CONFIG));
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if (err < 0) {
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dev_err(dev, "SP_ILOCK failed (%d)\n", err);
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return err;
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}
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/* PDS : Set the ports which are disabled in self-powered mode. */
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if (hub->port_off_mask) {
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err = regmap_update_bits(hub->regmap, USB3503_PDS,
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hub->port_off_mask,
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hub->port_off_mask);
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if (err < 0) {
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dev_err(dev, "PDS failed (%d)\n", err);
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return err;
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}
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}
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/* CFG1 : Set SELF_BUS_PWR, this enables self-powered operation. */
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err = regmap_update_bits(hub->regmap, USB3503_CFG1,
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USB3503_SELF_BUS_PWR,
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USB3503_SELF_BUS_PWR);
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if (err < 0) {
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dev_err(dev, "CFG1 failed (%d)\n", err);
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return err;
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}
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/* SP_LOCK: clear connect_n, config_n for hub connect */
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err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK,
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(USB3503_SPILOCK_CONNECT
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| USB3503_SPILOCK_CONFIG), 0);
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if (err < 0) {
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dev_err(dev, "SP_ILOCK failed (%d)\n", err);
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return err;
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}
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}
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if (gpio_is_valid(hub->gpio_connect))
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gpio_set_value_cansleep(hub->gpio_connect, 1);
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hub->mode = USB3503_MODE_HUB;
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dev_info(dev, "switched to HUB mode\n");
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return 0;
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}
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static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
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{
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struct device *dev = hub->dev;
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int err = 0;
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switch (mode) {
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case USB3503_MODE_HUB:
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err = usb3503_connect(hub);
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break;
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case USB3503_MODE_STANDBY:
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usb3503_reset(hub, 0);
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dev_info(dev, "switched to STANDBY mode\n");
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break;
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default:
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dev_err(dev, "unknown mode is requested\n");
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err = -EINVAL;
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break;
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}
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return err;
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}
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static const struct regmap_config usb3503_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = USB3503_RESET,
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};
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static int usb3503_probe(struct usb3503 *hub)
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{
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struct device *dev = hub->dev;
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struct usb3503_platform_data *pdata = dev_get_platdata(dev);
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struct device_node *np = dev->of_node;
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int err;
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u32 mode = USB3503_MODE_HUB;
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const u32 *property;
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int len;
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if (pdata) {
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hub->port_off_mask = pdata->port_off_mask;
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hub->gpio_intn = pdata->gpio_intn;
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hub->gpio_connect = pdata->gpio_connect;
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hub->gpio_reset = pdata->gpio_reset;
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hub->mode = pdata->initial_mode;
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} else if (np) {
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struct clk *clk;
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hub->port_off_mask = 0;
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clk = devm_clk_get(dev, "refclk");
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if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) {
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dev_err(dev, "unable to request refclk (%ld)\n",
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PTR_ERR(clk));
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return PTR_ERR(clk);
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}
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if (!IS_ERR(clk)) {
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u32 rate = 0;
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hub->clk = clk;
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if (!of_property_read_u32(np, "refclk-frequency",
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&rate)) {
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switch (rate) {
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case 38400000:
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case 26000000:
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case 19200000:
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case 12000000:
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hub->secondary_ref_clk = 0;
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break;
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case 24000000:
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case 27000000:
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case 25000000:
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case 50000000:
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hub->secondary_ref_clk = 1;
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break;
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default:
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dev_err(dev,
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"unsupported reference clock rate (%d)\n",
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(int) rate);
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return -EINVAL;
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}
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err = clk_set_rate(hub->clk, rate);
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if (err) {
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dev_err(dev,
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"unable to set reference clock rate to %d\n",
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(int) rate);
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return err;
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}
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}
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err = clk_prepare_enable(hub->clk);
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if (err) {
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dev_err(dev,
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"unable to enable reference clock\n");
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return err;
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}
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}
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property = of_get_property(np, "disabled-ports", &len);
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if (property && (len / sizeof(u32)) > 0) {
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int i;
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for (i = 0; i < len / sizeof(u32); i++) {
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u32 port = be32_to_cpu(property[i]);
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if ((1 <= port) && (port <= 3))
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hub->port_off_mask |= (1 << port);
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}
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}
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hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0);
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if (hub->gpio_intn == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
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if (hub->gpio_connect == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
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if (hub->gpio_reset == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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of_property_read_u32(np, "initial-mode", &mode);
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hub->mode = mode;
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}
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if (hub->port_off_mask && !hub->regmap)
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dev_err(dev, "Ports disabled with no control interface\n");
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if (gpio_is_valid(hub->gpio_intn)) {
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int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
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GPIOF_OUT_INIT_HIGH;
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err = devm_gpio_request_one(dev, hub->gpio_intn, val,
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"usb3503 intn");
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if (err) {
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dev_err(dev,
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"unable to request GPIO %d as interrupt pin (%d)\n",
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hub->gpio_intn, err);
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return err;
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}
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}
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if (gpio_is_valid(hub->gpio_connect)) {
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err = devm_gpio_request_one(dev, hub->gpio_connect,
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GPIOF_OUT_INIT_LOW, "usb3503 connect");
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if (err) {
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dev_err(dev,
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"unable to request GPIO %d as connect pin (%d)\n",
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hub->gpio_connect, err);
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return err;
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}
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}
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if (gpio_is_valid(hub->gpio_reset)) {
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err = devm_gpio_request_one(dev, hub->gpio_reset,
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GPIOF_OUT_INIT_LOW, "usb3503 reset");
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if (err) {
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dev_err(dev,
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"unable to request GPIO %d as reset pin (%d)\n",
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hub->gpio_reset, err);
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return err;
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}
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}
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usb3503_switch_mode(hub, hub->mode);
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dev_info(dev, "%s: probed in %s mode\n", __func__,
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(hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
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return 0;
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}
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static int usb3503_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct usb3503 *hub;
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int err;
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hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL);
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if (!hub)
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return -ENOMEM;
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i2c_set_clientdata(i2c, hub);
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hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config);
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if (IS_ERR(hub->regmap)) {
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err = PTR_ERR(hub->regmap);
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dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err);
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return err;
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}
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hub->dev = &i2c->dev;
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return usb3503_probe(hub);
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}
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static int usb3503_platform_probe(struct platform_device *pdev)
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{
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struct usb3503 *hub;
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hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL);
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if (!hub)
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return -ENOMEM;
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hub->dev = &pdev->dev;
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return usb3503_probe(hub);
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}
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#ifdef CONFIG_PM_SLEEP
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static int usb3503_i2c_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct usb3503 *hub = i2c_get_clientdata(client);
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usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
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if (hub->clk)
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clk_disable_unprepare(hub->clk);
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return 0;
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}
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static int usb3503_i2c_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct usb3503 *hub = i2c_get_clientdata(client);
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if (hub->clk)
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clk_prepare_enable(hub->clk);
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usb3503_switch_mode(hub, hub->mode);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
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usb3503_i2c_resume);
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static const struct i2c_device_id usb3503_id[] = {
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{ USB3503_I2C_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, usb3503_id);
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#ifdef CONFIG_OF
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static const struct of_device_id usb3503_of_match[] = {
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{ .compatible = "smsc,usb3503", },
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{ .compatible = "smsc,usb3503a", },
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{},
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};
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MODULE_DEVICE_TABLE(of, usb3503_of_match);
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#endif
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static struct i2c_driver usb3503_i2c_driver = {
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.driver = {
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.name = USB3503_I2C_NAME,
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.pm = &usb3503_i2c_pm_ops,
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.of_match_table = of_match_ptr(usb3503_of_match),
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},
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.probe = usb3503_i2c_probe,
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.id_table = usb3503_id,
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};
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static struct platform_driver usb3503_platform_driver = {
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.driver = {
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.name = USB3503_I2C_NAME,
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.of_match_table = of_match_ptr(usb3503_of_match),
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},
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.probe = usb3503_platform_probe,
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};
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static int __init usb3503_init(void)
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{
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int err;
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err = i2c_register_driver(THIS_MODULE, &usb3503_i2c_driver);
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if (err != 0)
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pr_err("usb3503: Failed to register I2C driver: %d\n", err);
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err = platform_driver_register(&usb3503_platform_driver);
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if (err != 0)
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pr_err("usb3503: Failed to register platform driver: %d\n",
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err);
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return 0;
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}
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module_init(usb3503_init);
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static void __exit usb3503_exit(void)
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{
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platform_driver_unregister(&usb3503_platform_driver);
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i2c_del_driver(&usb3503_i2c_driver);
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}
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module_exit(usb3503_exit);
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MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
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MODULE_DESCRIPTION("USB3503 USB HUB driver");
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MODULE_LICENSE("GPL");
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