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/platform_device.h>
  23 #include <linux/i2c.h>
  24 #include <linux/of.h>
  25 #include <linux/usb/isp1301.h>
  26
  27 #include <mach/hardware.h>
  28 #include <asm/mach-types.h>
  29 #include <asm/io.h>
  30
  31 #include <mach/platform.h>
  32 #include <mach/irqs.h>
  33
  34 #define USB_CONFIG_BASE         0x31020000
  35 #define PWRMAN_BASE             0x40004000
  36
  37 #define USB_CTRL                IO_ADDRESS(PWRMAN_BASE + 0x64)
  38
  39 /* USB_CTRL bit defines */
  40 #define USB_SLAVE_HCLK_EN       (1 << 24)
  41 #define USB_DEV_NEED_CLK_EN     (1 << 22)
  42 #define USB_HOST_NEED_CLK_EN    (1 << 21)
  43 #define PAD_CONTROL_LAST_DRIVEN (1 << 19)
  44
  45 #define USB_OTG_STAT_CONTROL    IO_ADDRESS(USB_CONFIG_BASE + 0x110)
  46
  47 /* USB_OTG_STAT_CONTROL bit defines */
  48 #define TRANSPARENT_I2C_EN      (1 << 7)
  49 #define HOST_EN                 (1 << 0)
  50
  51 /* On LPC32xx, those are undefined */
  52 #ifndef start_int_set_falling_edge
  53 #define start_int_set_falling_edge(irq)
  54 #define start_int_set_rising_edge(irq)
  55 #define start_int_ack(irq)
  56 #define start_int_mask(irq)
  57 #define start_int_umask(irq)
  58 #endif
  59
  60 static struct i2c_client *isp1301_i2c_client;
  61
  62 extern int usb_disabled(void);
  63
  64 static struct clk *usb_pll_clk;
  65 static struct clk *usb_dev_clk;
  66 static struct clk *usb_otg_clk;
  67
  68 static void isp1301_configure_lpc32xx(void)
  69 {
  70         /* LPC32XX only supports DAT_SE0 USB mode */
  71         /* This sequence is important */
  72
  73         /* Disable transparent UART mode first */
  74         i2c_smbus_write_byte_data(isp1301_i2c_client,
  75                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
  76                 MC1_UART_EN);
  77         i2c_smbus_write_byte_data(isp1301_i2c_client,
  78                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
  79                 ~MC1_SPEED_REG);
  80         i2c_smbus_write_byte_data(isp1301_i2c_client,
  81                                   ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
  82         i2c_smbus_write_byte_data(isp1301_i2c_client,
  83                   (ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
  84                   ~0);
  85         i2c_smbus_write_byte_data(isp1301_i2c_client,
  86                 ISP1301_I2C_MODE_CONTROL_2,
  87                 (MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
  88         i2c_smbus_write_byte_data(isp1301_i2c_client,
  89                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
  90         i2c_smbus_write_byte_data(isp1301_i2c_client,
  91                 ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
  92         i2c_smbus_write_byte_data(isp1301_i2c_client,
  93                 ISP1301_I2C_OTG_CONTROL_1,
  94                 (OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
  95         i2c_smbus_write_byte_data(isp1301_i2c_client,
  96                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
  97                 (OTG1_DM_PULLUP | OTG1_DP_PULLUP));
  98         i2c_smbus_write_byte_data(isp1301_i2c_client,
  99                 ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
 100         i2c_smbus_write_byte_data(isp1301_i2c_client,
 101                 ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
 102                 ~0);
 103         i2c_smbus_write_byte_data(isp1301_i2c_client,
 104                 ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
 105
 106         /* Enable usb_need_clk clock after transceiver is initialized */
 107         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
 108
 109         printk(KERN_INFO "ISP1301 Vendor ID  : 0x%04x\n",
 110               i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
 111         printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
 112               i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
 113         printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
 114               i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
 115 }
 116
 117 static void isp1301_configure(void)
 118 {
 119         isp1301_configure_lpc32xx();
 120 }
 121
 122 static inline void isp1301_vbus_on(void)
 123 {
 124         i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
 125                                   OTG1_VBUS_DRV);
 126 }
 127
 128 static inline void isp1301_vbus_off(void)
 129 {
 130         i2c_smbus_write_byte_data(isp1301_i2c_client,
 131                 ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
 132                 OTG1_VBUS_DRV);
 133 }
 134
 135 static void nxp_start_hc(void)
 136 {
 137         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
 138         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 139         isp1301_vbus_on();
 140 }
 141
 142 static void nxp_stop_hc(void)
 143 {
 144         unsigned long tmp;
 145         isp1301_vbus_off();
 146         tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
 147         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
 148 }
 149
 150 static int ohci_nxp_start(struct usb_hcd *hcd)
 151 {
 152         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 153         int ret;
 154
 155         if ((ret = ohci_init(ohci)) < 0)
 156                 return ret;
 157
 158         if ((ret = ohci_run(ohci)) < 0) {
 159                 dev_err(hcd->self.controller, "can't start\n");
 160                 ohci_stop(hcd);
 161                 return ret;
 162         }
 163         return 0;
 164 }
 165
 166 static const struct hc_driver ohci_nxp_hc_driver = {
 167         .description = hcd_name,
 168         .product_desc =         "nxp OHCI",
 169
 170         /*
 171          * generic hardware linkage
 172          */
 173         .irq = ohci_irq,
 174         .flags = HCD_USB11 | HCD_MEMORY,
 175
 176         .hcd_priv_size =        sizeof(struct ohci_hcd),
 177         /*
 178          * basic lifecycle operations
 179          */
 180         .start = ohci_nxp_start,
 181         .stop = ohci_stop,
 182         .shutdown = ohci_shutdown,
 183
 184         /*
 185          * managing i/o requests and associated device resources
 186          */
 187         .urb_enqueue = ohci_urb_enqueue,
 188         .urb_dequeue = ohci_urb_dequeue,
 189         .endpoint_disable = ohci_endpoint_disable,
 190
 191         /*
 192          * scheduling support
 193          */
 194         .get_frame_number = ohci_get_frame,
 195
 196         /*
 197          * root hub support
 198          */
 199         .hub_status_data = ohci_hub_status_data,
 200         .hub_control = ohci_hub_control,
 201 #ifdef  CONFIG_PM
 202         .bus_suspend = ohci_bus_suspend,
 203         .bus_resume = ohci_bus_resume,
 204 #endif
 205         .start_port_reset = ohci_start_port_reset,
 206 };
 207
 208 static int usb_hcd_nxp_probe(struct platform_device *pdev)
 209 {
 210         struct usb_hcd *hcd = 0;
 211         struct ohci_hcd *ohci;
 212         const struct hc_driver *driver = &ohci_nxp_hc_driver;
 213         struct resource *res;
 214         int ret = 0, irq;
 215         struct device_node *isp1301_node;
 216
 217         if (pdev->dev.of_node) {
 218                 isp1301_node = of_parse_phandle(pdev->dev.of_node,
 219                                                 "transceiver", 0);
 220         } else {
 221                 isp1301_node = NULL;
 222         }
 223
 224         isp1301_i2c_client = isp1301_get_client(isp1301_node);
 225         if (!isp1301_i2c_client) {
 226                 return -EPROBE_DEFER;
 227         }
 228
 229         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 230         pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 231
 232         dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
 233         if (usb_disabled()) {
 234                 dev_err(&pdev->dev, "USB is disabled\n");
 235                 ret = -ENODEV;
 236                 goto fail_disable;
 237         }
 238
 239         /* Enable AHB slave USB clock, needed for further USB clock control */
 240         __raw_writel(USB_SLAVE_HCLK_EN | PAD_CONTROL_LAST_DRIVEN, USB_CTRL);
 241
 242         /* Enable USB PLL */
 243         usb_pll_clk = clk_get(&pdev->dev, "ck_pll5");
 244         if (IS_ERR(usb_pll_clk)) {
 245                 dev_err(&pdev->dev, "failed to acquire USB PLL\n");
 246                 ret = PTR_ERR(usb_pll_clk);
 247                 goto fail_pll;
 248         }
 249
 250         ret = clk_enable(usb_pll_clk);
 251         if (ret < 0) {
 252                 dev_err(&pdev->dev, "failed to start USB PLL\n");
 253                 goto fail_pllen;
 254         }
 255
 256         ret = clk_set_rate(usb_pll_clk, 48000);
 257         if (ret < 0) {
 258                 dev_err(&pdev->dev, "failed to set USB clock rate\n");
 259                 goto fail_rate;
 260         }
 261
 262         /* Enable USB device clock */
 263         usb_dev_clk = clk_get(&pdev->dev, "ck_usbd");
 264         if (IS_ERR(usb_dev_clk)) {
 265                 dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
 266                 ret = PTR_ERR(usb_dev_clk);
 267                 goto fail_dev;
 268         }
 269
 270         ret = clk_enable(usb_dev_clk);
 271         if (ret < 0) {
 272                 dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
 273                 goto fail_deven;
 274         }
 275
 276         /* Enable USB otg clocks */
 277         usb_otg_clk = clk_get(&pdev->dev, "ck_usb_otg");
 278         if (IS_ERR(usb_otg_clk)) {
 279                 dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
 280                 ret = PTR_ERR(usb_otg_clk);
 281                 goto fail_otg;
 282         }
 283
 284         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
 285
 286         ret = clk_enable(usb_otg_clk);
 287         if (ret < 0) {
 288                 dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
 289                 goto fail_otgen;
 290         }
 291
 292         isp1301_configure();
 293
 294         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 295         if (!hcd) {
 296                 dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
 297                 ret = -ENOMEM;
 298                 goto fail_hcd;
 299         }
 300
 301         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 302         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 303         if (IS_ERR(hcd->regs)) {
 304                 ret = PTR_ERR(hcd->regs);
 305                 goto fail_resource;
 306         }
 307         hcd->rsrc_start = res->start;
 308         hcd->rsrc_len = resource_size(res);
 309
 310         irq = platform_get_irq(pdev, 0);
 311         if (irq < 0) {
 312                 ret = -ENXIO;
 313                 goto fail_resource;
 314         }
 315
 316         nxp_start_hc();
 317         platform_set_drvdata(pdev, hcd);
 318         ohci = hcd_to_ohci(hcd);
 319         ohci_hcd_init(ohci);
 320
 321         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
 322         ret = usb_add_hcd(hcd, irq, 0);
 323         if (ret == 0)
 324                 return ret;
 325
 326         nxp_stop_hc();
 327 fail_resource:
 328         usb_put_hcd(hcd);
 329 fail_hcd:
 330         clk_disable(usb_otg_clk);
 331 fail_otgen:
 332         clk_put(usb_otg_clk);
 333 fail_otg:
 334         clk_disable(usb_dev_clk);
 335 fail_deven:
 336         clk_put(usb_dev_clk);
 337 fail_dev:
 338 fail_rate:
 339         clk_disable(usb_pll_clk);
 340 fail_pllen:
 341         clk_put(usb_pll_clk);
 342 fail_pll:
 343 fail_disable:
 344         isp1301_i2c_client = NULL;
 345         return ret;
 346 }
 347
 348 static int usb_hcd_nxp_remove(struct platform_device *pdev)
 349 {
 350         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 351
 352         usb_remove_hcd(hcd);
 353         nxp_stop_hc();
 354         usb_put_hcd(hcd);
 355         clk_disable(usb_pll_clk);
 356         clk_put(usb_pll_clk);
 357         clk_disable(usb_dev_clk);
 358         clk_put(usb_dev_clk);
 359         i2c_unregister_device(isp1301_i2c_client);
 360         isp1301_i2c_client = NULL;
 361
 362         return 0;
 363 }
 364
 365 /* work with hotplug and coldplug */
 366 MODULE_ALIAS("platform:usb-ohci");
 367
 368 #ifdef CONFIG_OF
 369 static const struct of_device_id usb_hcd_nxp_match[] = {
 370         { .compatible = "nxp,ohci-nxp" },
 371         {},
 372 };
 373 MODULE_DEVICE_TABLE(of, usb_hcd_nxp_match);
 374 #endif
 375
 376 static struct platform_driver usb_hcd_nxp_driver = {
 377         .driver = {
 378                 .name = "usb-ohci",
 379                 .owner  = THIS_MODULE,
 380                 .of_match_table = of_match_ptr(usb_hcd_nxp_match),
 381         },
 382         .probe = usb_hcd_nxp_probe,
 383         .remove = usb_hcd_nxp_remove,
 384 };
 385