drivers/usb/host/ehci-pxa168.c

   1 /*
   2  * drivers/usb/host/ehci-pxa168.c
   3  *
   4  * Tanmay Upadhyay <tanmay.upadhyay@einfochips.com>
   5  *
   6  * Based on drivers/usb/host/ehci-orion.c
   7  *
   8  * This file is licensed under  the terms of the GNU General Public
   9  * License version 2. This program is licensed "as is" without any
  10  * warranty of any kind, whether express or implied.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/clk.h>
  17 #include <mach/pxa168.h>
  18
  19 #define USB_PHY_CTRL_REG 0x4
  20 #define USB_PHY_PLL_REG  0x8
  21 #define USB_PHY_TX_REG   0xc
  22
  23 #define FBDIV_SHIFT      4
  24
  25 #define ICP_SHIFT        12
  26 #define ICP_15            2
  27 #define ICP_20            3
  28 #define ICP_25            4
  29
  30 #define KVCO_SHIFT       15
  31
  32 #define PLLCALI12_SHIFT  25
  33 #define CALI12_VDD        0
  34 #define CALI12_09         1
  35 #define CALI12_10         2
  36 #define CALI12_11         3
  37
  38 #define PLLVDD12_SHIFT   27
  39 #define VDD12_VDD         0
  40 #define VDD12_10          1
  41 #define VDD12_11          2
  42 #define VDD12_12          3
  43
  44 #define PLLVDD18_SHIFT   29
  45 #define VDD18_19          0
  46 #define VDD18_20          1
  47 #define VDD18_21          2
  48 #define VDD18_22          3
  49
  50
  51 #define PLL_READY        (1 << 23)
  52 #define VCOCAL_START     (1 << 21)
  53 #define REG_RCAL_START   (1 << 12)
  54
  55 struct pxa168_usb_drv_data {
  56         struct ehci_hcd ehci;
  57         struct clk      *pxa168_usb_clk;
  58         struct resource *usb_phy_res;
  59         void __iomem    *usb_phy_reg_base;
  60 };
  61
  62 static int ehci_pxa168_setup(struct usb_hcd *hcd)
  63 {
  64         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  65         int retval;
  66
  67         ehci_reset(ehci);
  68         retval = ehci_halt(ehci);
  69         if (retval)
  70                 return retval;
  71
  72         /*
  73          * data structure init
  74          */
  75         retval = ehci_init(hcd);
  76         if (retval)
  77                 return retval;
  78
  79         hcd->has_tt = 1;
  80
  81         ehci_port_power(ehci, 0);
  82
  83         return retval;
  84 }
  85
  86 static const struct hc_driver ehci_pxa168_hc_driver = {
  87         .description = hcd_name,
  88         .product_desc = "Marvell PXA168 EHCI",
  89         .hcd_priv_size = sizeof(struct pxa168_usb_drv_data),
  90
  91         /*
  92          * generic hardware linkage
  93          */
  94         .irq = ehci_irq,
  95         .flags = HCD_MEMORY | HCD_USB2,
  96
  97         /*
  98          * basic lifecycle operations
  99          */
 100         .reset = ehci_pxa168_setup,
 101         .start = ehci_run,
 102         .stop = ehci_stop,
 103         .shutdown = ehci_shutdown,
 104
 105         /*
 106          * managing i/o requests and associated device resources
 107          */
 108         .urb_enqueue = ehci_urb_enqueue,
 109         .urb_dequeue = ehci_urb_dequeue,
 110         .endpoint_disable = ehci_endpoint_disable,
 111         .endpoint_reset = ehci_endpoint_reset,
 112
 113         /*
 114          * scheduling support
 115          */
 116         .get_frame_number = ehci_get_frame,
 117
 118         /*
 119          * root hub support
 120          */
 121         .hub_status_data = ehci_hub_status_data,
 122         .hub_control = ehci_hub_control,
 123         .bus_suspend = ehci_bus_suspend,
 124         .bus_resume = ehci_bus_resume,
 125         .relinquish_port = ehci_relinquish_port,
 126         .port_handed_over = ehci_port_handed_over,
 127
 128         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 129 };
 130
 131 static int pxa168_usb_phy_init(struct platform_device *pdev)
 132 {
 133         struct resource *res;
 134         void __iomem *usb_phy_reg_base;
 135         struct pxa168_usb_pdata *pdata;
 136         struct pxa168_usb_drv_data *drv_data;
 137         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 138         unsigned long reg_val;
 139         int pll_retry_cont = 10000, err = 0;
 140
 141         drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
 142         pdata = (struct pxa168_usb_pdata *)pdev->dev.platform_data;
 143
 144         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 145         if (!res) {
 146                 dev_err(&pdev->dev,
 147                         "Found HC with no PHY register addr. Check %s setup!\n",
 148                         dev_name(&pdev->dev));
 149                 return -ENODEV;
 150         }
 151
 152         if (!request_mem_region(res->start, resource_size(res),
 153                                 ehci_pxa168_hc_driver.description)) {
 154                 dev_dbg(&pdev->dev, "controller already in use\n");
 155                 return -EBUSY;
 156         }
 157
 158         usb_phy_reg_base = ioremap(res->start, resource_size(res));
 159         if (usb_phy_reg_base == NULL) {
 160                 dev_dbg(&pdev->dev, "error mapping memory\n");
 161                 err = -EFAULT;
 162                 goto err1;
 163         }
 164         drv_data->usb_phy_reg_base = usb_phy_reg_base;
 165         drv_data->usb_phy_res = res;
 166
 167         /* If someone wants to init USB phy in board specific way */
 168         if (pdata && pdata->phy_init)
 169                 return pdata->phy_init(usb_phy_reg_base);
 170
 171         /* Power up the PHY and PLL */
 172         writel(readl(usb_phy_reg_base + USB_PHY_CTRL_REG) | 0x3,
 173                 usb_phy_reg_base + USB_PHY_CTRL_REG);
 174
 175         /* Configure PHY PLL */
 176         reg_val = readl(usb_phy_reg_base + USB_PHY_PLL_REG) & ~(0x7e03ffff);
 177         reg_val |= (VDD18_22 << PLLVDD18_SHIFT | VDD12_12 << PLLVDD12_SHIFT |
 178                 CALI12_11 << PLLCALI12_SHIFT | 3 << KVCO_SHIFT |
 179                 ICP_15 << ICP_SHIFT | 0xee << FBDIV_SHIFT | 0xb);
 180         writel(reg_val, usb_phy_reg_base + USB_PHY_PLL_REG);
 181
 182         /* Make sure PHY PLL is ready */
 183         while (!(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & PLL_READY)) {
 184                 if (!(pll_retry_cont--)) {
 185                         dev_dbg(&pdev->dev, "USB PHY PLL not ready\n");
 186                         err = -EIO;
 187                         goto err2;
 188                 }
 189         }
 190
 191         /* Toggle VCOCAL_START bit of U2PLL for PLL calibration */
 192         udelay(200);
 193         writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) | VCOCAL_START,
 194                 usb_phy_reg_base + USB_PHY_PLL_REG);
 195         udelay(40);
 196         writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & ~VCOCAL_START,
 197                 usb_phy_reg_base + USB_PHY_PLL_REG);
 198
 199         /* Toggle REG_RCAL_START bit of U2PTX for impedance calibration */
 200         udelay(400);
 201         writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) | REG_RCAL_START,
 202                 usb_phy_reg_base + USB_PHY_TX_REG);
 203         udelay(40);
 204         writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) & ~REG_RCAL_START,
 205                 usb_phy_reg_base + USB_PHY_TX_REG);
 206
 207         /* Make sure PHY PLL is ready again */
 208         pll_retry_cont = 0;
 209         while (!(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & PLL_READY)) {
 210                 if (!(pll_retry_cont--)) {
 211                         dev_dbg(&pdev->dev, "USB PHY PLL not ready\n");
 212                         err = -EIO;
 213                         goto err2;
 214                 }
 215         }
 216
 217         return 0;
 218 err2:
 219         iounmap(usb_phy_reg_base);
 220 err1:
 221         release_mem_region(res->start, resource_size(res));
 222         return err;
 223 }
 224
 225 static int __devinit ehci_pxa168_drv_probe(struct platform_device *pdev)
 226 {
 227         struct resource *res;
 228         struct usb_hcd *hcd;
 229         struct ehci_hcd *ehci;
 230         struct pxa168_usb_drv_data *drv_data;
 231         void __iomem *regs;
 232         int irq, err = 0;
 233
 234         if (usb_disabled())
 235                 return -ENODEV;
 236
 237         pr_debug("Initializing pxa168-SoC USB Host Controller\n");
 238
 239         irq = platform_get_irq(pdev, 0);
 240         if (irq <= 0) {
 241                 dev_err(&pdev->dev,
 242                         "Found HC with no IRQ. Check %s setup!\n",
 243                         dev_name(&pdev->dev));
 244                 err = -ENODEV;
 245                 goto err1;
 246         }
 247
 248         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 249         if (!res) {
 250                 dev_err(&pdev->dev,
 251                         "Found HC with no register addr. Check %s setup!\n",
 252                         dev_name(&pdev->dev));
 253                 err = -ENODEV;
 254                 goto err1;
 255         }
 256
 257         if (!request_mem_region(res->start, resource_size(res),
 258                                 ehci_pxa168_hc_driver.description)) {
 259                 dev_dbg(&pdev->dev, "controller already in use\n");
 260                 err = -EBUSY;
 261                 goto err1;
 262         }
 263
 264         regs = ioremap(res->start, resource_size(res));
 265         if (regs == NULL) {
 266                 dev_dbg(&pdev->dev, "error mapping memory\n");
 267                 err = -EFAULT;
 268                 goto err2;
 269         }
 270
 271         hcd = usb_create_hcd(&ehci_pxa168_hc_driver,
 272                         &pdev->dev, dev_name(&pdev->dev));
 273         if (!hcd) {
 274                 err = -ENOMEM;
 275                 goto err3;
 276         }
 277
 278         drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
 279
 280         /* Enable USB clock */
 281         drv_data->pxa168_usb_clk = clk_get(&pdev->dev, "PXA168-USBCLK");
 282         if (IS_ERR(drv_data->pxa168_usb_clk)) {
 283                 dev_err(&pdev->dev, "Couldn't get USB clock\n");
 284                 err = PTR_ERR(drv_data->pxa168_usb_clk);
 285                 goto err4;
 286         }
 287         clk_enable(drv_data->pxa168_usb_clk);
 288
 289         err = pxa168_usb_phy_init(pdev);
 290         if (err) {
 291                 dev_err(&pdev->dev, "USB PHY initialization failed\n");
 292                 goto err5;
 293         }
 294
 295         hcd->rsrc_start = res->start;
 296         hcd->rsrc_len = resource_size(res);
 297         hcd->regs = regs;
 298
 299         ehci = hcd_to_ehci(hcd);
 300         ehci->caps = hcd->regs + 0x100;
 301         ehci->regs = hcd->regs + 0x100 +
 302                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 303         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 304         hcd->has_tt = 1;
 305         ehci->sbrn = 0x20;
 306
 307         err = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
 308         if (err)
 309                 goto err5;
 310
 311         return 0;
 312
 313 err5:
 314         clk_disable(drv_data->pxa168_usb_clk);
 315         clk_put(drv_data->pxa168_usb_clk);
 316 err4:
 317         usb_put_hcd(hcd);
 318 err3:
 319         iounmap(regs);
 320 err2:
 321         release_mem_region(res->start, resource_size(res));
 322 err1:
 323         dev_err(&pdev->dev, "init %s fail, %d\n",
 324                 dev_name(&pdev->dev), err);
 325
 326         return err;
 327 }
 328
 329 static int __exit ehci_pxa168_drv_remove(struct platform_device *pdev)
 330 {
 331         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 332         struct pxa168_usb_drv_data *drv_data =
 333                 (struct pxa168_usb_drv_data *)hcd->hcd_priv;
 334
 335         usb_remove_hcd(hcd);
 336
 337         /* Power down PHY & PLL */
 338         writel(readl(drv_data->usb_phy_reg_base + USB_PHY_CTRL_REG) & (~0x3),
 339                 drv_data->usb_phy_reg_base + USB_PHY_CTRL_REG);
 340
 341         clk_disable(drv_data->pxa168_usb_clk);
 342         clk_put(drv_data->pxa168_usb_clk);
 343
 344         iounmap(hcd->regs);
 345         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 346
 347         iounmap(drv_data->usb_phy_reg_base);
 348         release_mem_region(drv_data->usb_phy_res->start,
 349                         resource_size(drv_data->usb_phy_res));
 350
 351         usb_put_hcd(hcd);
 352
 353         return 0;
 354 }
 355
 356 MODULE_ALIAS("platform:pxa168-ehci");
 357
 358 static struct platform_driver ehci_pxa168_driver = {
 359         .probe          = ehci_pxa168_drv_probe,
 360         .remove         = __exit_p(ehci_pxa168_drv_remove),
 361         .shutdown       = usb_hcd_platform_shutdown,
 362         .driver.name    = "pxa168-ehci",
 363 };