1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * xHCI host controller driver 4 * 5 * Copyright (C) 2008 Intel Corp. 6 * 7 * Author: Sarah Sharp 8 * Some code borrowed from the Linux EHCI driver. 9 */ 10 /* Up to 16 ms to halt an HC */ 11 #define XHCI_MAX_HALT_USEC (16*1000) 12 /* HC not running - set to 1 when run/stop bit is cleared. */ 13 #define XHCI_STS_HALT (1<<0) 14 15 /* HCCPARAMS offset from PCI base address */ 16 #define XHCI_HCC_PARAMS_OFFSET 0x10 17 /* HCCPARAMS contains the first extended capability pointer */ 18 #define XHCI_HCC_EXT_CAPS(p) (((p)>>16)&0xffff) 19 20 /* Command and Status registers offset from the Operational Registers address */ 21 #define XHCI_CMD_OFFSET 0x00 22 #define XHCI_STS_OFFSET 0x04 23 24 #define XHCI_MAX_EXT_CAPS 50 25 26 /* Capability Register */ 27 /* bits 7:0 - how long is the Capabilities register */ 28 #define XHCI_HC_LENGTH(p) (((p)>>00)&0x00ff) 29 30 /* Extended capability register fields */ 31 #define XHCI_EXT_CAPS_ID(p) (((p)>>0)&0xff) 32 #define XHCI_EXT_CAPS_NEXT(p) (((p)>>8)&0xff) 33 #define XHCI_EXT_CAPS_VAL(p) ((p)>>16) 34 /* Extended capability IDs - ID 0 reserved */ 35 #define XHCI_EXT_CAPS_LEGACY 1 36 #define XHCI_EXT_CAPS_PROTOCOL 2 37 #define XHCI_EXT_CAPS_PM 3 38 #define XHCI_EXT_CAPS_VIRT 4 39 #define XHCI_EXT_CAPS_ROUTE 5 40 /* IDs 6-9 reserved */ 41 #define XHCI_EXT_CAPS_DEBUG 10 42 /* USB Legacy Support Capability - section 7.1.1 */ 43 #define XHCI_HC_BIOS_OWNED (1 << 16) 44 #define XHCI_HC_OS_OWNED (1 << 24) 45 46 /* USB Legacy Support Capability - section 7.1.1 */ 47 /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */ 48 #define XHCI_LEGACY_SUPPORT_OFFSET (0x00) 49 50 /* USB Legacy Support Control and Status Register - section 7.1.2 */ 51 /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */ 52 #define XHCI_LEGACY_CONTROL_OFFSET (0x04) 53 /* bits 1:3, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */ 54 #define XHCI_LEGACY_DISABLE_SMI ((0x7 << 1) + (0xff << 5) + (0x7 << 17)) 55 #define XHCI_LEGACY_SMI_EVENTS (0x7 << 29) 56 57 /* USB 2.0 xHCI 0.96 L1C capability - section 7.2.2.1.3.2 */ 58 #define XHCI_L1C (1 << 16) 59 60 /* USB 2.0 xHCI 1.0 hardware LMP capability - section 7.2.2.1.3.2 */ 61 #define XHCI_HLC (1 << 19) 62 #define XHCI_BLC (1 << 20) 63 64 /* command register values to disable interrupts and halt the HC */ 65 /* start/stop HC execution - do not write unless HC is halted*/ 66 #define XHCI_CMD_RUN (1 << 0) 67 /* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */ 68 #define XHCI_CMD_EIE (1 << 2) 69 /* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */ 70 #define XHCI_CMD_HSEIE (1 << 3) 71 /* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */ 72 #define XHCI_CMD_EWE (1 << 10) 73 74 #define XHCI_IRQS (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE) 75 76 /* true: Controller Not Ready to accept doorbell or op reg writes after reset */ 77 #define XHCI_STS_CNR (1 << 11) 78 79 #include <linux/io.h> 80 81 /** 82 * Find the offset of the extended capabilities with capability ID id. 83 * 84 * @base PCI MMIO registers base address. 85 * @start address at which to start looking, (0 or HCC_PARAMS to start at 86 * beginning of list) 87 * @id Extended capability ID to search for. 88 * 89 * Returns the offset of the next matching extended capability structure. 90 * Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL, 91 * and this provides a way to find them all. 92 */ 93 94 static inline int xhci_find_next_ext_cap(void __iomem *base, u32 start, int id) 95 { 96 u32 val; 97 u32 next; 98 u32 offset; 99 100 offset = start; 101 if (!start || start == XHCI_HCC_PARAMS_OFFSET) { 102 val = readl(base + XHCI_HCC_PARAMS_OFFSET); 103 if (val == ~0) 104 return 0; 105 offset = XHCI_HCC_EXT_CAPS(val) << 2; 106 if (!offset) 107 return 0; 108 } 109 do { 110 val = readl(base + offset); 111 if (val == ~0) 112 return 0; 113 if (XHCI_EXT_CAPS_ID(val) == id && offset != start) 114 return offset; 115 116 next = XHCI_EXT_CAPS_NEXT(val); 117 offset += next << 2; 118 } while (next); 119 120 return 0; 121 } 122