/* * xHCI host controller driver * * Copyright (C) 2008 Intel Corp. * * Author: Sarah Sharp * Some code borrowed from the Linux EHCI driver. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* Up to 16 microframes to halt an HC - one microframe is 125 microsectonds */ #define XHCI_MAX_HALT_USEC (16*125) /* HC not running - set to 1 when run/stop bit is cleared. */ #define XHCI_STS_HALT (1<<0) /* HCCPARAMS offset from PCI base address */ #define XHCI_HCC_PARAMS_OFFSET 0x10 /* HCCPARAMS contains the first extended capability pointer */ #define XHCI_HCC_EXT_CAPS(p) (((p)>>16)&0xffff) /* Command and Status registers offset from the Operational Registers address */ #define XHCI_CMD_OFFSET 0x00 #define XHCI_STS_OFFSET 0x04 #define XHCI_MAX_EXT_CAPS 50 /* Capability Register */ /* bits 7:0 - how long is the Capabilities register */ #define XHCI_HC_LENGTH(p) (((p)>>00)&0x00ff) /* Extended capability register fields */ #define XHCI_EXT_CAPS_ID(p) (((p)>>0)&0xff) #define XHCI_EXT_CAPS_NEXT(p) (((p)>>8)&0xff) #define XHCI_EXT_CAPS_VAL(p) ((p)>>16) /* Extended capability IDs - ID 0 reserved */ #define XHCI_EXT_CAPS_LEGACY 1 #define XHCI_EXT_CAPS_PROTOCOL 2 #define XHCI_EXT_CAPS_PM 3 #define XHCI_EXT_CAPS_VIRT 4 #define XHCI_EXT_CAPS_ROUTE 5 /* IDs 6-9 reserved */ #define XHCI_EXT_CAPS_DEBUG 10 /* USB Legacy Support Capability - section 7.1.1 */ #define XHCI_HC_BIOS_OWNED (1 << 16) #define XHCI_HC_OS_OWNED (1 << 24) /* USB Legacy Support Capability - section 7.1.1 */ /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */ #define XHCI_LEGACY_SUPPORT_OFFSET (0x00) /* USB Legacy Support Control and Status Register - section 7.1.2 */ /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */ #define XHCI_LEGACY_CONTROL_OFFSET (0x04) /* bits 1:2, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */ #define XHCI_LEGACY_DISABLE_SMI ((0x3 << 1) + (0xff << 5) + (0x7 << 17)) /* command register values to disable interrupts and halt the HC */ /* start/stop HC execution - do not write unless HC is halted*/ #define XHCI_CMD_RUN (1 << 0) /* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */ #define XHCI_CMD_EIE (1 << 2) /* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */ #define XHCI_CMD_HSEIE (1 << 3) /* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */ #define XHCI_CMD_EWE (1 << 10) #define XHCI_IRQS (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE) /* true: Controller Not Ready to accept doorbell or op reg writes after reset */ #define XHCI_STS_CNR (1 << 11) #include <linux/io.h> /** * Return the next extended capability pointer register. * * @base PCI register base address. * * @ext_offset Offset of the 32-bit register that contains the extended * capabilites pointer. If searching for the first extended capability, pass * in XHCI_HCC_PARAMS_OFFSET. If searching for the next extended capability, * pass in the offset of the current extended capability register. * * Returns 0 if there is no next extended capability register or returns the register offset * from the PCI registers base address. */ static inline int xhci_find_next_cap_offset(void __iomem *base, int ext_offset) { u32 next; next = readl(base + ext_offset); if (ext_offset == XHCI_HCC_PARAMS_OFFSET) /* Find the first extended capability */ next = XHCI_HCC_EXT_CAPS(next); else /* Find the next extended capability */ next = XHCI_EXT_CAPS_NEXT(next); if (!next) return 0; /* * Address calculation from offset of extended capabilities * (or HCCPARAMS) register - see section 5.3.6 and section 7. */ return ext_offset + (next << 2); } /** * Find the offset of the extended capabilities with capability ID id. * * @base PCI MMIO registers base address. * @ext_offset Offset from base of the first extended capability to look at, * or the address of HCCPARAMS. * @id Extended capability ID to search for. * * This uses an arbitrary limit of XHCI_MAX_EXT_CAPS extended capabilities * to make sure that the list doesn't contain a loop. */ static inline int xhci_find_ext_cap_by_id(void __iomem *base, int ext_offset, int id) { u32 val; int limit = XHCI_MAX_EXT_CAPS; while (ext_offset && limit > 0) { val = readl(base + ext_offset); if (XHCI_EXT_CAPS_ID(val) == id) break; ext_offset = xhci_find_next_cap_offset(base, ext_offset); limit--; } if (limit > 0) return ext_offset; return 0; }