drivers/usb/host/ohci-nxp.c

   1 /*
   2  * driver for NXP USB Host devices
   3  *
   4  * Currently supported OHCI host devices:
   5  * - NXP LPC32xx
   6  *
   7  * Authors: Dmitry Chigirev <source@mvista.com>
   8  *          Vitaly Wool <vitalywool@gmail.com>
   9  *
  10  * register initialization is based on code examples provided by Philips
  11  * Copyright (c) 2005 Koninklijke Philips Electronics N.V.
  12  *
  13  * NOTE: This driver does not have suspend/resume functionality
  14  * This driver is intended for engineering development purposes only
  15  *
  16  * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
  17  * the terms of the GNU General Public License version 2. This program
  18  * is licensed "as is" without any warranty of any kind, whether express
  19  * or implied.
  20  */
  21 #include <linux/clk.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/io.h>
  24 #include <linux/i2c.h>
  25 #include <linux/module.h>
  26 #include <linux/of.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/usb/isp1301.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/hcd.h>
  31
  32 #include "ohci.h"
  33
  34 #include <mach/hardware.h>
  35
  36 #define USB_CONFIG_BASE         0x31020000
  37 #define USB_OTG_STAT_CONTROL    IO_ADDRESS(USB_CONFIG_BASE + 0x110)
  38
  39 /* USB_OTG_STAT_CONTROL bit defines */
  40 #define TRANSPARENT_I2C_EN      (1 << 7)
  41 #define HOST_EN                 (1 << 0)
  42
  43 /* On LPC32xx, those are undefined */
  44 #ifndef start_int_set_falling_edge
  45 #define start_int_set_falling_edge(irq)
  46 #define start_int_set_rising_edge(irq)
  47 #define start_int_ack(irq)
  48 #define start_int_mask(irq)
  49 #define start_int_umask(irq)
  50 #endif
  51
  52 #define DRIVER_DESC "OHCI NXP driver"
  53
  54 static const char hcd_name[] = "ohci-nxp";
  55 static struct hc_driver __read_mostly ohci_nxp_hc_driver;
  56
  57 static struct i2c_client *isp1301_i2c_client;
  58
  59 static struct clk *usb_host_clk;
  60
  61 static void isp1301_configure_lpc32xx(void)
  62 {
  63         /* LPC32XX only supports DAT_SE0 USB mode */
  64         /* This sequence is important */
  65
  66         /* Disable transparent UART mode first */
  67         i2c_smbus_write_byte_data(isp1301_i2c_client,
  68                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
  69                 MC1_UART_EN);
  70         i2c_smbus_write_byte_data(isp1301_i2c_client,
  71                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
  72                 ~MC1_SPEED_REG);
  73         i2c_smbus_write_byte_data(isp1301_i2c_client,
  74                                   ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
  75         i2c_smbus_write_byte_data(isp1301_i2c_client,
  76                   (ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
  77                   ~0);
  78         i2c_smbus_write_byte_data(isp1301_i2c_client,
  79                 ISP1301_I2C_MODE_CONTROL_2,
  80                 (MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
  81         i2c_smbus_write_byte_data(isp1301_i2c_client,
  82                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
  83         i2c_smbus_write_byte_data(isp1301_i2c_client,
  84                 ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
  85         i2c_smbus_write_byte_data(isp1301_i2c_client,
  86                 ISP1301_I2C_OTG_CONTROL_1,
  87                 (OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
  88         i2c_smbus_write_byte_data(isp1301_i2c_client,
  89                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
  90                 (OTG1_DM_PULLUP | OTG1_DP_PULLUP));
  91         i2c_smbus_write_byte_data(isp1301_i2c_client,
  92                 ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
  93         i2c_smbus_write_byte_data(isp1301_i2c_client,
  94                 ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
  95                 ~0);
  96         i2c_smbus_write_byte_data(isp1301_i2c_client,
  97                 ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
  98
  99         printk(KERN_INFO "ISP1301 Vendor ID  : 0x%04x\n",
 100               i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
 101         printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
 102               i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
 103         printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
 104               i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
 105 }
 106
 107 static void isp1301_configure(void)
 108 {
 109         isp1301_configure_lpc32xx();
 110 }
 111
 112 static inline void isp1301_vbus_on(void)
 113 {
 114         i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
 115                                   OTG1_VBUS_DRV);
 116 }
 117
 118 static inline void isp1301_vbus_off(void)
 119 {
 120         i2c_smbus_write_byte_data(isp1301_i2c_client,
 121                 ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
 122                 OTG1_VBUS_DRV);
 123 }
 124
 125 static void ohci_nxp_start_hc(void)
 126 {
 127         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
 128
 129         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 130         isp1301_vbus_on();
 131 }
 132
 133 static void ohci_nxp_stop_hc(void)
 134 {
 135         unsigned long tmp;
 136
 137         isp1301_vbus_off();
 138         tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
 139         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 140 }
 141
 142 static int ohci_hcd_nxp_probe(struct platform_device *pdev)
 143 {
 144         struct usb_hcd *hcd = 0;
 145         const struct hc_driver *driver = &ohci_nxp_hc_driver;
 146         struct resource *res;
 147         int ret = 0, irq;
 148         struct device_node *isp1301_node;
 149
 150         if (pdev->dev.of_node) {
 151                 isp1301_node = of_parse_phandle(pdev->dev.of_node,
 152                                                 "transceiver", 0);
 153         } else {
 154                 isp1301_node = NULL;
 155         }
 156
 157         isp1301_i2c_client = isp1301_get_client(isp1301_node);
 158         if (!isp1301_i2c_client)
 159                 return -EPROBE_DEFER;
 160
 161         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 162         if (ret)
 163                 goto fail_disable;
 164
 165         dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
 166         if (usb_disabled()) {
 167                 dev_err(&pdev->dev, "USB is disabled\n");
 168                 ret = -ENODEV;
 169                 goto fail_disable;
 170         }
 171
 172         /* Enable USB host clock */
 173         usb_host_clk = devm_clk_get(&pdev->dev, NULL);
 174         if (IS_ERR(usb_host_clk)) {
 175                 dev_err(&pdev->dev, "failed to acquire USB OHCI clock\n");
 176                 ret = PTR_ERR(usb_host_clk);
 177                 goto fail_disable;
 178         }
 179
 180         ret = clk_prepare_enable(usb_host_clk);
 181         if (ret < 0) {
 182                 dev_err(&pdev->dev, "failed to start USB OHCI clock\n");
 183                 goto fail_disable;
 184         }
 185
 186         isp1301_configure();
 187
 188         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 189         if (!hcd) {
 190                 dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
 191                 ret = -ENOMEM;
 192                 goto fail_hcd;
 193         }
 194
 195         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 196         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 197         if (IS_ERR(hcd->regs)) {
 198                 ret = PTR_ERR(hcd->regs);
 199                 goto fail_resource;
 200         }
 201         hcd->rsrc_start = res->start;
 202         hcd->rsrc_len = resource_size(res);
 203
 204         irq = platform_get_irq(pdev, 0);
 205         if (irq < 0) {
 206                 ret = -ENXIO;
 207                 goto fail_resource;
 208         }
 209
 210         ohci_nxp_start_hc();
 211         platform_set_drvdata(pdev, hcd);
 212
 213         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
 214         ret = usb_add_hcd(hcd, irq, 0);
 215         if (ret == 0) {
 216                 device_wakeup_enable(hcd->self.controller);
 217                 return ret;
 218         }
 219
 220         ohci_nxp_stop_hc();
 221 fail_resource:
 222         usb_put_hcd(hcd);
 223 fail_hcd:
 224         clk_disable_unprepare(usb_host_clk);
 225 fail_disable:
 226         isp1301_i2c_client = NULL;
 227         return ret;
 228 }
 229
 230 static int ohci_hcd_nxp_remove(struct platform_device *pdev)
 231 {
 232         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 233
 234         usb_remove_hcd(hcd);
 235         ohci_nxp_stop_hc();
 236         usb_put_hcd(hcd);
 237         clk_disable_unprepare(usb_host_clk);
 238         isp1301_i2c_client = NULL;
 239
 240         return 0;
 241 }
 242
 243 /* work with hotplug and coldplug */
 244 MODULE_ALIAS("platform:usb-ohci");
 245
 246 #ifdef CONFIG_OF
 247 static const struct of_device_id ohci_hcd_nxp_match[] = {
 248         { .compatible = "nxp,ohci-nxp" },
 249         {},
 250 };
 251 MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match);
 252 #endif
 253
 254 static struct platform_driver ohci_hcd_nxp_driver = {
 255         .driver = {
 256                 .name = "usb-ohci",
 257                 .of_match_table = of_match_ptr(ohci_hcd_nxp_match),
 258         },
 259         .probe = ohci_hcd_nxp_probe,
 260         .remove = ohci_hcd_nxp_remove,
 261 };
 262
 263 static int __init ohci_nxp_init(void)
 264 {
 265         if (usb_disabled())
 266                 return -ENODEV;
 267
 268         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 269
 270         ohci_init_driver(&ohci_nxp_hc_driver, NULL);
 271         return platform_driver_register(&ohci_hcd_nxp_driver);
 272 }
 273 module_init(ohci_nxp_init);
 274
 275 static void __exit ohci_nxp_cleanup(void)
 276 {
 277         platform_driver_unregister(&ohci_hcd_nxp_driver);
 278 }
 279 module_exit(ohci_nxp_cleanup);
 280
 281 MODULE_DESCRIPTION(DRIVER_DESC);
 282 MODULE_LICENSE("GPL v2");