drivers/usb/host/xhci-ext-caps.h

   1 /*
   2  * xHCI host controller driver
   3  *
   4  * Copyright (C) 2008 Intel Corp.
   5  *
   6  * Author: Sarah Sharp
   7  * Some code borrowed from the Linux EHCI driver.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22 /* Up to 16 microframes to halt an HC - one microframe is 125 microsectonds */
  23 #define XHCI_MAX_HALT_USEC      (16*125)
  24 /* HC not running - set to 1 when run/stop bit is cleared. */
  25 #define XHCI_STS_HALT           (1<<0)
  26
  27 /* HCCPARAMS offset from PCI base address */
  28 #define XHCI_HCC_PARAMS_OFFSET  0x10
  29 /* HCCPARAMS contains the first extended capability pointer */
  30 #define XHCI_HCC_EXT_CAPS(p)    (((p)>>16)&0xffff)
  31
  32 /* Command and Status registers offset from the Operational Registers address */
  33 #define XHCI_CMD_OFFSET         0x00
  34 #define XHCI_STS_OFFSET         0x04
  35
  36 #define XHCI_MAX_EXT_CAPS               50
  37
  38 /* Capability Register */
  39 /* bits 7:0 - how long is the Capabilities register */
  40 #define XHCI_HC_LENGTH(p)       (((p)>>00)&0x00ff)
  41
  42 /* Extended capability register fields */
  43 #define XHCI_EXT_CAPS_ID(p)     (((p)>>0)&0xff)
  44 #define XHCI_EXT_CAPS_NEXT(p)   (((p)>>8)&0xff)
  45 #define XHCI_EXT_CAPS_VAL(p)    ((p)>>16)
  46 /* Extended capability IDs - ID 0 reserved */
  47 #define XHCI_EXT_CAPS_LEGACY    1
  48 #define XHCI_EXT_CAPS_PROTOCOL  2
  49 #define XHCI_EXT_CAPS_PM        3
  50 #define XHCI_EXT_CAPS_VIRT      4
  51 #define XHCI_EXT_CAPS_ROUTE     5
  52 /* IDs 6-9 reserved */
  53 #define XHCI_EXT_CAPS_DEBUG     10
  54 /* USB Legacy Support Capability - section 7.1.1 */
  55 #define XHCI_HC_BIOS_OWNED      (1 << 16)
  56 #define XHCI_HC_OS_OWNED        (1 << 24)
  57
  58 /* USB Legacy Support Capability - section 7.1.1 */
  59 /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
  60 #define XHCI_LEGACY_SUPPORT_OFFSET      (0x00)
  61
  62 /* USB Legacy Support Control and Status Register  - section 7.1.2 */
  63 /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
  64 #define XHCI_LEGACY_CONTROL_OFFSET      (0x04)
  65 /* bits 1:2, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */
  66 #define XHCI_LEGACY_DISABLE_SMI         ((0x3 << 1) + (0xff << 5) + (0x7 << 17))
  67
  68 /* command register values to disable interrupts and halt the HC */
  69 /* start/stop HC execution - do not write unless HC is halted*/
  70 #define XHCI_CMD_RUN            (1 << 0)
  71 /* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */
  72 #define XHCI_CMD_EIE            (1 << 2)
  73 /* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */
  74 #define XHCI_CMD_HSEIE          (1 << 3)
  75 /* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
  76 #define XHCI_CMD_EWE            (1 << 10)
  77
  78 #define XHCI_IRQS               (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE)
  79
  80 /* true: Controller Not Ready to accept doorbell or op reg writes after reset */
  81 #define XHCI_STS_CNR            (1 << 11)
  82
  83 #include <linux/io.h>
  84
  85 /**
  86  * Return the next extended capability pointer register.
  87  *
  88  * @base        PCI register base address.
  89  *
  90  * @ext_offset  Offset of the 32-bit register that contains the extended
  91  * capabilites pointer.  If searching for the first extended capability, pass
  92  * in XHCI_HCC_PARAMS_OFFSET.  If searching for the next extended capability,
  93  * pass in the offset of the current extended capability register.
  94  *
  95  * Returns 0 if there is no next extended capability register or returns the register offset
  96  * from the PCI registers base address.
  97  */
  98 static inline int xhci_find_next_cap_offset(void __iomem *base, int ext_offset)
  99 {
 100         u32 next;
 101
 102         next = readl(base + ext_offset);
 103
 104         if (ext_offset == XHCI_HCC_PARAMS_OFFSET)
 105                 /* Find the first extended capability */
 106                 next = XHCI_HCC_EXT_CAPS(next);
 107         else
 108                 /* Find the next extended capability */
 109                 next = XHCI_EXT_CAPS_NEXT(next);
 110         if (!next)
 111                 return 0;
 112         /*
 113          * Address calculation from offset of extended capabilities
 114          * (or HCCPARAMS) register - see section 5.3.6 and section 7.
 115          */
 116         return ext_offset + (next << 2);
 117 }
 118
 119 /**
 120  * Find the offset of the extended capabilities with capability ID id.
 121  *
 122  * @base PCI MMIO registers base address.
 123  * @ext_offset Offset from base of the first extended capability to look at,
 124  *              or the address of HCCPARAMS.
 125  * @id Extended capability ID to search for.
 126  *
 127  * This uses an arbitrary limit of XHCI_MAX_EXT_CAPS extended capabilities
 128  * to make sure that the list doesn't contain a loop.
 129  */
 130 static inline int xhci_find_ext_cap_by_id(void __iomem *base, int ext_offset, int id)
 131 {
 132         u32 val;
 133         int limit = XHCI_MAX_EXT_CAPS;
 134
 135         while (ext_offset && limit > 0) {
 136                 val = readl(base + ext_offset);
 137                 if (XHCI_EXT_CAPS_ID(val) == id)
 138                         break;
 139                 ext_offset = xhci_find_next_cap_offset(base, ext_offset);
 140                 limit--;
 141         }
 142         if (limit > 0)
 143                 return ext_offset;
 144         return 0;
 145 }