drivers/usb/host/ehci-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_EHCI_HCD_NAME "octeon-ehci"
  20
  21 /* Common clock init code.  */
  22 void octeon2_usb_clocks_start(void);
  23 void octeon2_usb_clocks_stop(void);
  24
  25 static void ehci_octeon_start(void)
  26 {
  27         union cvmx_uctlx_ehci_ctl ehci_ctl;
  28
  29         octeon2_usb_clocks_start();
  30
  31         ehci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_EHCI_CTL(0));
  32         /* Use 64-bit addressing. */
  33         ehci_ctl.s.ehci_64b_addr_en = 1;
  34         ehci_ctl.s.l2c_addr_msb = 0;
  35         ehci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */
  36         ehci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */
  37         cvmx_write_csr(CVMX_UCTLX_EHCI_CTL(0), ehci_ctl.u64);
  38 }
  39
  40 static void ehci_octeon_stop(void)
  41 {
  42         octeon2_usb_clocks_stop();
  43 }
  44
  45 static const struct hc_driver ehci_octeon_hc_driver = {
  46         .description            = hcd_name,
  47         .product_desc           = "Octeon EHCI",
  48         .hcd_priv_size          = sizeof(struct ehci_hcd),
  49
  50         /*
  51          * generic hardware linkage
  52          */
  53         .irq                    = ehci_irq,
  54         .flags                  = HCD_MEMORY | HCD_USB2,
  55
  56         /*
  57          * basic lifecycle operations
  58          */
  59         .reset                  = ehci_init,
  60         .start                  = ehci_run,
  61         .stop                   = ehci_stop,
  62         .shutdown               = ehci_shutdown,
  63
  64         /*
  65          * managing i/o requests and associated device resources
  66          */
  67         .urb_enqueue            = ehci_urb_enqueue,
  68         .urb_dequeue            = ehci_urb_dequeue,
  69         .endpoint_disable       = ehci_endpoint_disable,
  70         .endpoint_reset         = ehci_endpoint_reset,
  71
  72         /*
  73          * scheduling support
  74          */
  75         .get_frame_number       = ehci_get_frame,
  76
  77         /*
  78          * root hub support
  79          */
  80         .hub_status_data        = ehci_hub_status_data,
  81         .hub_control            = ehci_hub_control,
  82         .bus_suspend            = ehci_bus_suspend,
  83         .bus_resume             = ehci_bus_resume,
  84         .relinquish_port        = ehci_relinquish_port,
  85         .port_handed_over       = ehci_port_handed_over,
  86
  87         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  88 };
  89
  90 static u64 ehci_octeon_dma_mask = DMA_BIT_MASK(64);
  91
  92 static int ehci_octeon_drv_probe(struct platform_device *pdev)
  93 {
  94         struct usb_hcd *hcd;
  95         struct ehci_hcd *ehci;
  96         struct resource *res_mem;
  97         int irq;
  98         int ret;
  99
 100         if (usb_disabled())
 101                 return -ENODEV;
 102
 103         irq = platform_get_irq(pdev, 0);
 104         if (irq < 0) {
 105                 dev_err(&pdev->dev, "No irq assigned\n");
 106                 return -ENODEV;
 107         }
 108
 109         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 110         if (res_mem == NULL) {
 111                 dev_err(&pdev->dev, "No register space assigned\n");
 112                 return -ENODEV;
 113         }
 114
 115         /*
 116          * We can DMA from anywhere. But the descriptors must be in
 117          * the lower 4GB.
 118          */
 119         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 120         pdev->dev.dma_mask = &ehci_octeon_dma_mask;
 121
 122         hcd = usb_create_hcd(&ehci_octeon_hc_driver, &pdev->dev, "octeon");
 123         if (!hcd)
 124                 return -ENOMEM;
 125
 126         hcd->rsrc_start = res_mem->start;
 127         hcd->rsrc_len = resource_size(res_mem);
 128
 129         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 130                                 OCTEON_EHCI_HCD_NAME)) {
 131                 dev_err(&pdev->dev, "request_mem_region failed\n");
 132                 ret = -EBUSY;
 133                 goto err1;
 134         }
 135
 136         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 137         if (!hcd->regs) {
 138                 dev_err(&pdev->dev, "ioremap failed\n");
 139                 ret = -ENOMEM;
 140                 goto err2;
 141         }
 142
 143         ehci_octeon_start();
 144
 145         ehci = hcd_to_ehci(hcd);
 146
 147         /* Octeon EHCI matches CPU endianness. */
 148 #ifdef __BIG_ENDIAN
 149         ehci->big_endian_mmio = 1;
 150 #endif
 151
 152         ehci->caps = hcd->regs;
 153         ehci->regs = hcd->regs +
 154                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 155         /* cache this readonly data; minimize chip reads */
 156         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 157
 158         ehci_reset(ehci);
 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 err3;
 164         }
 165
 166         platform_set_drvdata(pdev, hcd);
 167
 168         /* root ports should always stay powered */
 169         ehci_port_power(ehci, 1);
 170
 171         return 0;
 172 err3:
 173         ehci_octeon_stop();
 174
 175         iounmap(hcd->regs);
 176 err2:
 177         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 178 err1:
 179         usb_put_hcd(hcd);
 180         return ret;
 181 }
 182
 183 static int ehci_octeon_drv_remove(struct platform_device *pdev)
 184 {
 185         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 186
 187         usb_remove_hcd(hcd);
 188
 189         ehci_octeon_stop();
 190         iounmap(hcd->regs);
 191         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 192         usb_put_hcd(hcd);
 193
 194         platform_set_drvdata(pdev, NULL);
 195
 196         return 0;
 197 }
 198
 199 static struct platform_driver ehci_octeon_driver = {
 200         .probe          = ehci_octeon_drv_probe,
 201         .remove         = ehci_octeon_drv_remove,
 202         .shutdown       = usb_hcd_platform_shutdown,
 203         .driver = {
 204                 .name   = OCTEON_EHCI_HCD_NAME,
 205                 .owner  = THIS_MODULE,
 206         }
 207 };
 208
 209 MODULE_ALIAS("platform:" OCTEON_EHCI_HCD_NAME);