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Replace the existing two extended capability parsing helper functions with one called xhci_find_next_ext_cap(). The extended capabilities are read both in pci-quirks before xhci driver is loaded, and inside the xhci driver when adding ports. The existing helpers did not suit well for these cases and a lot of custom parsing code was needed. The new helper function simplifies these two cases a lot. The motivation for this rework was that code to support xhci debug capability needed to parse extended capabilities, and it included yet another capability parsing helper specific for its needs. With this solution it debug capability code can use this new helper as well Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
130 lines
4.4 KiB
C
130 lines
4.4 KiB
C
/*
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* xHCI host controller driver
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*
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* Copyright (C) 2008 Intel Corp.
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*
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* Author: Sarah Sharp
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* Some code borrowed from the Linux EHCI driver.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* Up to 16 ms to halt an HC */
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#define XHCI_MAX_HALT_USEC (16*1000)
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/* HC not running - set to 1 when run/stop bit is cleared. */
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#define XHCI_STS_HALT (1<<0)
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/* HCCPARAMS offset from PCI base address */
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#define XHCI_HCC_PARAMS_OFFSET 0x10
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/* HCCPARAMS contains the first extended capability pointer */
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#define XHCI_HCC_EXT_CAPS(p) (((p)>>16)&0xffff)
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/* Command and Status registers offset from the Operational Registers address */
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#define XHCI_CMD_OFFSET 0x00
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#define XHCI_STS_OFFSET 0x04
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#define XHCI_MAX_EXT_CAPS 50
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/* Capability Register */
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/* bits 7:0 - how long is the Capabilities register */
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#define XHCI_HC_LENGTH(p) (((p)>>00)&0x00ff)
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/* Extended capability register fields */
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#define XHCI_EXT_CAPS_ID(p) (((p)>>0)&0xff)
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#define XHCI_EXT_CAPS_NEXT(p) (((p)>>8)&0xff)
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#define XHCI_EXT_CAPS_VAL(p) ((p)>>16)
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/* Extended capability IDs - ID 0 reserved */
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#define XHCI_EXT_CAPS_LEGACY 1
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#define XHCI_EXT_CAPS_PROTOCOL 2
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#define XHCI_EXT_CAPS_PM 3
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#define XHCI_EXT_CAPS_VIRT 4
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#define XHCI_EXT_CAPS_ROUTE 5
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/* IDs 6-9 reserved */
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#define XHCI_EXT_CAPS_DEBUG 10
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/* USB Legacy Support Capability - section 7.1.1 */
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#define XHCI_HC_BIOS_OWNED (1 << 16)
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#define XHCI_HC_OS_OWNED (1 << 24)
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/* USB Legacy Support Capability - section 7.1.1 */
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/* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
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#define XHCI_LEGACY_SUPPORT_OFFSET (0x00)
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/* USB Legacy Support Control and Status Register - section 7.1.2 */
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/* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
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#define XHCI_LEGACY_CONTROL_OFFSET (0x04)
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/* bits 1:3, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */
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#define XHCI_LEGACY_DISABLE_SMI ((0x7 << 1) + (0xff << 5) + (0x7 << 17))
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#define XHCI_LEGACY_SMI_EVENTS (0x7 << 29)
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/* USB 2.0 xHCI 0.96 L1C capability - section 7.2.2.1.3.2 */
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#define XHCI_L1C (1 << 16)
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/* USB 2.0 xHCI 1.0 hardware LMP capability - section 7.2.2.1.3.2 */
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#define XHCI_HLC (1 << 19)
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#define XHCI_BLC (1 << 20)
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/* command register values to disable interrupts and halt the HC */
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/* start/stop HC execution - do not write unless HC is halted*/
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#define XHCI_CMD_RUN (1 << 0)
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/* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */
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#define XHCI_CMD_EIE (1 << 2)
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/* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */
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#define XHCI_CMD_HSEIE (1 << 3)
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/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
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#define XHCI_CMD_EWE (1 << 10)
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#define XHCI_IRQS (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE)
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/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
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#define XHCI_STS_CNR (1 << 11)
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#include <linux/io.h>
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/**
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* Find the offset of the extended capabilities with capability ID id.
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*
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* @base PCI MMIO registers base address.
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* @start address at which to start looking, (0 or HCC_PARAMS to start at
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* beginning of list)
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* @id Extended capability ID to search for.
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*
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* Returns the offset of the next matching extended capability structure.
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* Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL,
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* and this provides a way to find them all.
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*/
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static inline int xhci_find_next_ext_cap(void __iomem *base, u32 start, int id)
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{
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u32 val;
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u32 next;
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u32 offset;
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offset = start;
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if (!start || start == XHCI_HCC_PARAMS_OFFSET) {
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val = readl(base + XHCI_HCC_PARAMS_OFFSET);
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offset = XHCI_HCC_EXT_CAPS(val) << 2;
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if (!offset)
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return 0;
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};
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do {
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val = readl(base + offset);
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if (XHCI_EXT_CAPS_ID(val) == id && offset != start)
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return offset;
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next = XHCI_EXT_CAPS_NEXT(val);
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offset += next << 2;
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} while (next);
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return 0;
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}
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