157 lines
5.3 KiB
C
157 lines
5.3 KiB
C
/*
|
|
* 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 ms to halt an HC */
|
|
#define XHCI_MAX_HALT_USEC (16*1000)
|
|
/* 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 1:3, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */
|
|
#define XHCI_LEGACY_DISABLE_SMI ((0x7 << 1) + (0xff << 5) + (0x7 << 17))
|
|
#define XHCI_LEGACY_SMI_EVENTS (0x7 << 29)
|
|
|
|
/* USB 2.0 xHCI 0.96 L1C capability - section 7.2.2.1.3.2 */
|
|
#define XHCI_L1C (1 << 16)
|
|
|
|
/* USB 2.0 xHCI 1.0 hardware LMP capability - section 7.2.2.1.3.2 */
|
|
#define XHCI_HLC (1 << 19)
|
|
#define XHCI_BLC (1 << 20)
|
|
|
|
/* 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);
|
|
ext_offset = 0;
|
|
} 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;
|
|
}
|