drivers/usb/host/ohci-octeon.c

   1 /*
   2  * EHCI HCD glue for Cavium Octeon II SOCs.
   3  *
   4  * Loosely based on ehci-au1xxx.c
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  *
  10  * Copyright (C) 2010 Cavium Networks
  11  *
  12  */
  13
  14 #include <linux/platform_device.h>
  15
  16 #include <asm/octeon/octeon.h>
  17 #include <asm/octeon/cvmx-uctlx-defs.h>
  18
  19 #define OCTEON_OHCI_HCD_NAME "octeon-ohci"
  20
  21 /* Common clock init code.  */
  22 void octeon2_usb_clocks_start(void);
  23 void octeon2_usb_clocks_stop(void);
  24
  25 static void ohci_octeon_hw_start(void)
  26 {
  27         union cvmx_uctlx_ohci_ctl ohci_ctl;
  28
  29         octeon2_usb_clocks_start();
  30
  31         ohci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_OHCI_CTL(0));
  32         ohci_ctl.s.l2c_addr_msb = 0;
  33         ohci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */
  34         ohci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */
  35         cvmx_write_csr(CVMX_UCTLX_OHCI_CTL(0), ohci_ctl.u64);
  36
  37 }
  38
  39 static void ohci_octeon_hw_stop(void)
  40 {
  41         /* Undo ohci_octeon_start() */
  42         octeon2_usb_clocks_stop();
  43 }
  44
  45 static int ohci_octeon_start(struct usb_hcd *hcd)
  46 {
  47         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  48         int ret;
  49
  50         ret = ohci_init(ohci);
  51
  52         if (ret < 0)
  53                 return ret;
  54
  55         ret = ohci_run(ohci);
  56
  57         if (ret < 0) {
  58                 ohci_err(ohci, "can't start %s", hcd->self.bus_name);
  59                 ohci_stop(hcd);
  60                 return ret;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static const struct hc_driver ohci_octeon_hc_driver = {
  67         .description            = hcd_name,
  68         .product_desc           = "Octeon OHCI",
  69         .hcd_priv_size          = sizeof(struct ohci_hcd),
  70
  71         /*
  72          * generic hardware linkage
  73          */
  74         .irq =                  ohci_irq,
  75         .flags =                HCD_USB11 | HCD_MEMORY,
  76
  77         /*
  78          * basic lifecycle operations
  79          */
  80         .start =                ohci_octeon_start,
  81         .stop =                 ohci_stop,
  82         .shutdown =             ohci_shutdown,
  83
  84         /*
  85          * managing i/o requests and associated device resources
  86          */
  87         .urb_enqueue =          ohci_urb_enqueue,
  88         .urb_dequeue =          ohci_urb_dequeue,
  89         .endpoint_disable =     ohci_endpoint_disable,
  90
  91         /*
  92          * scheduling support
  93          */
  94         .get_frame_number =     ohci_get_frame,
  95
  96         /*
  97          * root hub support
  98          */
  99         .hub_status_data =      ohci_hub_status_data,
 100         .hub_control =          ohci_hub_control,
 101
 102         .start_port_reset =     ohci_start_port_reset,
 103 };
 104
 105 static int ohci_octeon_drv_probe(struct platform_device *pdev)
 106 {
 107         struct usb_hcd *hcd;
 108         struct ohci_hcd *ohci;
 109         void *reg_base;
 110         struct resource *res_mem;
 111         int irq;
 112         int ret;
 113
 114         if (usb_disabled())
 115                 return -ENODEV;
 116
 117         irq = platform_get_irq(pdev, 0);
 118         if (irq < 0) {
 119                 dev_err(&pdev->dev, "No irq assigned\n");
 120                 return -ENODEV;
 121         }
 122
 123         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 124         if (res_mem == NULL) {
 125                 dev_err(&pdev->dev, "No register space assigned\n");
 126                 return -ENODEV;
 127         }
 128
 129         /* Ohci is a 32-bit device. */
 130         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 131         if (ret)
 132                 return ret;
 133
 134         hcd = usb_create_hcd(&ohci_octeon_hc_driver, &pdev->dev, "octeon");
 135         if (!hcd)
 136                 return -ENOMEM;
 137
 138         hcd->rsrc_start = res_mem->start;
 139         hcd->rsrc_len = resource_size(res_mem);
 140
 141         reg_base = devm_ioremap_resource(&pdev->dev, res_mem);
 142         if (IS_ERR(reg_base)) {
 143                 ret = PTR_ERR(reg_base);
 144                 goto err1;
 145         }
 146
 147         ohci_octeon_hw_start();
 148
 149         hcd->regs = reg_base;
 150
 151         ohci = hcd_to_ohci(hcd);
 152
 153         /* Octeon OHCI matches CPU endianness. */
 154 #ifdef __BIG_ENDIAN
 155         ohci->flags |= OHCI_QUIRK_BE_MMIO;
 156 #endif
 157
 158         ohci_hcd_init(ohci);
 159
 160         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 161         if (ret) {
 162                 dev_dbg(&pdev->dev, "failed to add hcd with err %d\n", ret);
 163                 goto err2;
 164         }
 165
 166         device_wakeup_enable(hcd->self.controller);
 167
 168         platform_set_drvdata(pdev, hcd);
 169
 170         return 0;
 171
 172 err2:
 173         ohci_octeon_hw_stop();
 174
 175 err1:
 176         usb_put_hcd(hcd);
 177         return ret;
 178 }
 179
 180 static int ohci_octeon_drv_remove(struct platform_device *pdev)
 181 {
 182         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 183
 184         usb_remove_hcd(hcd);
 185
 186         ohci_octeon_hw_stop();
 187         usb_put_hcd(hcd);
 188
 189         return 0;
 190 }
 191
 192 static struct platform_driver ohci_octeon_driver = {
 193         .probe          = ohci_octeon_drv_probe,
 194         .remove         = ohci_octeon_drv_remove,
 195         .shutdown       = usb_hcd_platform_shutdown,
 196         .driver = {
 197                 .name   = OCTEON_OHCI_HCD_NAME,
 198                 .owner  = THIS_MODULE,
 199         }
 200 };
 201
 202 MODULE_ALIAS("platform:" OCTEON_OHCI_HCD_NAME);