drivers/usb/host/ohci-sa1111.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * OHCI HCD (Host Controller Driver) for USB.
   4  *
   5  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   6  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   7  * (C) Copyright 2002 Hewlett-Packard Company
   8  *
   9  * SA1111 Bus Glue
  10  *
  11  * Written by Christopher Hoover <ch@hpl.hp.com>
  12  * Based on fragments of previous driver by Russell King et al.
  13  *
  14  * This file is licenced under the GPL.
  15  */
  16
  17 #include <asm/mach-types.h>
  18 #include <asm/hardware/sa1111.h>
  19
  20 #ifndef CONFIG_SA1111
  21 #error "This file is SA-1111 bus glue.  CONFIG_SA1111 must be defined."
  22 #endif
  23
  24 #define USB_STATUS      0x0118
  25 #define USB_RESET       0x011c
  26 #define USB_IRQTEST     0x0120
  27
  28 #define USB_RESET_FORCEIFRESET  (1 << 0)
  29 #define USB_RESET_FORCEHCRESET  (1 << 1)
  30 #define USB_RESET_CLKGENRESET   (1 << 2)
  31 #define USB_RESET_SIMSCALEDOWN  (1 << 3)
  32 #define USB_RESET_USBINTTEST    (1 << 4)
  33 #define USB_RESET_SLEEPSTBYEN   (1 << 5)
  34 #define USB_RESET_PWRSENSELOW   (1 << 6)
  35 #define USB_RESET_PWRCTRLLOW    (1 << 7)
  36
  37 #define USB_STATUS_IRQHCIRMTWKUP  (1 <<  7)
  38 #define USB_STATUS_IRQHCIBUFFACC  (1 <<  8)
  39 #define USB_STATUS_NIRQHCIM       (1 <<  9)
  40 #define USB_STATUS_NHCIMFCLR      (1 << 10)
  41 #define USB_STATUS_USBPWRSENSE    (1 << 11)
  42
  43 #if 0
  44 static void dump_hci_status(struct usb_hcd *hcd, const char *label)
  45 {
  46         unsigned long status = readl_relaxed(hcd->regs + USB_STATUS);
  47
  48         printk(KERN_DEBUG "%s USB_STATUS = { %s%s%s%s%s}\n", label,
  49              ((status & USB_STATUS_IRQHCIRMTWKUP) ? "IRQHCIRMTWKUP " : ""),
  50              ((status & USB_STATUS_IRQHCIBUFFACC) ? "IRQHCIBUFFACC " : ""),
  51              ((status & USB_STATUS_NIRQHCIM) ? "" : "IRQHCIM "),
  52              ((status & USB_STATUS_NHCIMFCLR) ? "" : "HCIMFCLR "),
  53              ((status & USB_STATUS_USBPWRSENSE) ? "USBPWRSENSE " : ""));
  54 }
  55 #endif
  56
  57 static int ohci_sa1111_reset(struct usb_hcd *hcd)
  58 {
  59         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  60
  61         ohci_hcd_init(ohci);
  62         return ohci_init(ohci);
  63 }
  64
  65 static int ohci_sa1111_start(struct usb_hcd *hcd)
  66 {
  67         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  68         int ret;
  69
  70         ret = ohci_run(ohci);
  71         if (ret < 0) {
  72                 ohci_err(ohci, "can't start\n");
  73                 ohci_stop(hcd);
  74         }
  75         return ret;
  76 }
  77
  78 static const struct hc_driver ohci_sa1111_hc_driver = {
  79         .description =          hcd_name,
  80         .product_desc =         "SA-1111 OHCI",
  81         .hcd_priv_size =        sizeof(struct ohci_hcd),
  82
  83         /*
  84          * generic hardware linkage
  85          */
  86         .irq =                  ohci_irq,
  87         .flags =                HCD_USB11 | HCD_MEMORY,
  88
  89         /*
  90          * basic lifecycle operations
  91          */
  92         .reset =                ohci_sa1111_reset,
  93         .start =                ohci_sa1111_start,
  94         .stop =                 ohci_stop,
  95         .shutdown =             ohci_shutdown,
  96
  97         /*
  98          * managing i/o requests and associated device resources
  99          */
 100         .urb_enqueue =          ohci_urb_enqueue,
 101         .urb_dequeue =          ohci_urb_dequeue,
 102         .endpoint_disable =     ohci_endpoint_disable,
 103
 104         /*
 105          * scheduling support
 106          */
 107         .get_frame_number =     ohci_get_frame,
 108
 109         /*
 110          * root hub support
 111          */
 112         .hub_status_data =      ohci_hub_status_data,
 113         .hub_control =          ohci_hub_control,
 114 #ifdef  CONFIG_PM
 115         .bus_suspend =          ohci_bus_suspend,
 116         .bus_resume =           ohci_bus_resume,
 117 #endif
 118         .start_port_reset =     ohci_start_port_reset,
 119 };
 120
 121 static int sa1111_start_hc(struct sa1111_dev *dev)
 122 {
 123         unsigned int usb_rst = 0;
 124         int ret;
 125
 126         dev_dbg(&dev->dev, "starting SA-1111 OHCI USB Controller\n");
 127
 128         if (machine_is_xp860() ||
 129             machine_is_assabet() ||
 130             machine_is_pfs168() ||
 131             machine_is_badge4())
 132                 usb_rst = USB_RESET_PWRSENSELOW | USB_RESET_PWRCTRLLOW;
 133
 134         /*
 135          * Configure the power sense and control lines.  Place the USB
 136          * host controller in reset.
 137          */
 138         writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
 139                       dev->mapbase + USB_RESET);
 140
 141         /*
 142          * Now, carefully enable the USB clock, and take
 143          * the USB host controller out of reset.
 144          */
 145         ret = sa1111_enable_device(dev);
 146         if (ret == 0) {
 147                 udelay(11);
 148                 writel_relaxed(usb_rst, dev->mapbase + USB_RESET);
 149         }
 150
 151         return ret;
 152 }
 153
 154 static void sa1111_stop_hc(struct sa1111_dev *dev)
 155 {
 156         unsigned int usb_rst;
 157
 158         dev_dbg(&dev->dev, "stopping SA-1111 OHCI USB Controller\n");
 159
 160         /*
 161          * Put the USB host controller into reset.
 162          */
 163         usb_rst = readl_relaxed(dev->mapbase + USB_RESET);
 164         writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
 165                       dev->mapbase + USB_RESET);
 166
 167         /*
 168          * Stop the USB clock.
 169          */
 170         sa1111_disable_device(dev);
 171 }
 172
 173 /**
 174  * ohci_hcd_sa1111_probe - initialize SA-1111-based HCDs
 175  *
 176  * Allocates basic resources for this USB host controller, and
 177  * then invokes the start() method for the HCD associated with it.
 178  */
 179 static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev)
 180 {
 181         struct usb_hcd *hcd;
 182         int ret, irq;
 183
 184         if (usb_disabled())
 185                 return -ENODEV;
 186
 187         /*
 188          * We don't call dma_set_mask_and_coherent() here because the
 189          * DMA mask has already been appropraitely setup by the core
 190          * SA-1111 bus code (which includes bug workarounds.)
 191          */
 192
 193         hcd = usb_create_hcd(&ohci_sa1111_hc_driver, &dev->dev, "sa1111");
 194         if (!hcd)
 195                 return -ENOMEM;
 196
 197         hcd->rsrc_start = dev->res.start;
 198         hcd->rsrc_len = resource_size(&dev->res);
 199
 200         irq = sa1111_get_irq(dev, 1);
 201         if (irq <= 0) {
 202                 ret = irq ? : -ENXIO;
 203                 goto err1;
 204         }
 205
 206         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 207                 dev_dbg(&dev->dev, "request_mem_region failed\n");
 208                 ret = -EBUSY;
 209                 goto err1;
 210         }
 211
 212         hcd->regs = dev->mapbase;
 213
 214         ret = sa1111_start_hc(dev);
 215         if (ret)
 216                 goto err2;
 217
 218         ret = usb_add_hcd(hcd, irq, 0);
 219         if (ret == 0) {
 220                 device_wakeup_enable(hcd->self.controller);
 221                 return ret;
 222         }
 223
 224         sa1111_stop_hc(dev);
 225  err2:
 226         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 227  err1:
 228         usb_put_hcd(hcd);
 229         return ret;
 230 }
 231
 232 /**
 233  * ohci_hcd_sa1111_remove - shutdown processing for SA-1111-based HCDs
 234  * @dev: USB Host Controller being removed
 235  *
 236  * Reverses the effect of ohci_hcd_sa1111_probe(), first invoking
 237  * the HCD's stop() method.
 238  */
 239 static int ohci_hcd_sa1111_remove(struct sa1111_dev *dev)
 240 {
 241         struct usb_hcd *hcd = sa1111_get_drvdata(dev);
 242
 243         usb_remove_hcd(hcd);
 244         sa1111_stop_hc(dev);
 245         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 246         usb_put_hcd(hcd);
 247
 248         return 0;
 249 }
 250
 251 static void ohci_hcd_sa1111_shutdown(struct device *_dev)
 252 {
 253         struct sa1111_dev *dev = to_sa1111_device(_dev);
 254         struct usb_hcd *hcd = sa1111_get_drvdata(dev);
 255
 256         if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 257                 hcd->driver->shutdown(hcd);
 258                 sa1111_stop_hc(dev);
 259         }
 260 }
 261
 262 static struct sa1111_driver ohci_hcd_sa1111_driver = {
 263         .drv = {
 264                 .name   = "sa1111-ohci",
 265                 .owner  = THIS_MODULE,
 266                 .shutdown = ohci_hcd_sa1111_shutdown,
 267         },
 268         .devid          = SA1111_DEVID_USB,
 269         .probe          = ohci_hcd_sa1111_probe,
 270         .remove         = ohci_hcd_sa1111_remove,
 271 };