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xHCI host controllers can optionally implement a no-op test. This simple test ensures the OS has correctly setup all basic data structures and can correctly respond to interrupts from the host controller hardware. There are two rings exercised by the no-op test: the command ring, and the event ring. The host controller driver writes a no-op command TRB to the command ring, and rings the doorbell for the command ring (the first entry in the doorbell array). The hardware receives this event, places a command completion event on the event ring, and fires an interrupt. The host controller driver sees the interrupt, and checks the event ring for TRBs it can process, and sees the command completion event. (See the rules in xhci-ring.c for who "owns" a TRB. This is a simplified set of rules, and may not contain all the details that are in the xHCI 0.95 spec.) A timer fires every 60 seconds to debug the state of the hardware and command and event rings. This timer only runs if CONFIG_USB_XHCI_HCD_DEBUGGING is 'y'. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
387 lines
12 KiB
C
387 lines
12 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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#include "xhci.h"
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#define XHCI_INIT_VALUE 0x0
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/* Add verbose debugging later, just print everything for now */
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void xhci_dbg_regs(struct xhci_hcd *xhci)
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{
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u32 temp;
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xhci_dbg(xhci, "// xHCI capability registers at 0x%x:\n",
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(unsigned int) xhci->cap_regs);
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temp = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
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xhci_dbg(xhci, "// @%x = 0x%x (CAPLENGTH AND HCIVERSION)\n",
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(unsigned int) &xhci->cap_regs->hc_capbase,
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(unsigned int) temp);
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xhci_dbg(xhci, "// CAPLENGTH: 0x%x\n",
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(unsigned int) HC_LENGTH(temp));
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#if 0
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xhci_dbg(xhci, "// HCIVERSION: 0x%x\n",
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(unsigned int) HC_VERSION(temp));
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#endif
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xhci_dbg(xhci, "// xHCI operational registers at 0x%x:\n",
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(unsigned int) xhci->op_regs);
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temp = xhci_readl(xhci, &xhci->cap_regs->run_regs_off);
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xhci_dbg(xhci, "// @%x = 0x%x RTSOFF\n",
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(unsigned int) &xhci->cap_regs->run_regs_off,
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(unsigned int) temp & RTSOFF_MASK);
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xhci_dbg(xhci, "// xHCI runtime registers at 0x%x:\n",
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(unsigned int) xhci->run_regs);
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temp = xhci_readl(xhci, &xhci->cap_regs->db_off);
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xhci_dbg(xhci, "// @%x = 0x%x DBOFF\n",
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(unsigned int) &xhci->cap_regs->db_off, temp);
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xhci_dbg(xhci, "// Doorbell array at 0x%x:\n",
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(unsigned int) xhci->dba);
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}
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void xhci_print_cap_regs(struct xhci_hcd *xhci)
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{
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u32 temp;
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xhci_dbg(xhci, "xHCI capability registers at 0x%x:\n",
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(unsigned int) xhci->cap_regs);
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temp = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
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xhci_dbg(xhci, "CAPLENGTH AND HCIVERSION 0x%x:\n",
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(unsigned int) temp);
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xhci_dbg(xhci, "CAPLENGTH: 0x%x\n",
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(unsigned int) HC_LENGTH(temp));
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xhci_dbg(xhci, "HCIVERSION: 0x%x\n",
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(unsigned int) HC_VERSION(temp));
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temp = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
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xhci_dbg(xhci, "HCSPARAMS 1: 0x%x\n",
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(unsigned int) temp);
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xhci_dbg(xhci, " Max device slots: %u\n",
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(unsigned int) HCS_MAX_SLOTS(temp));
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xhci_dbg(xhci, " Max interrupters: %u\n",
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(unsigned int) HCS_MAX_INTRS(temp));
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xhci_dbg(xhci, " Max ports: %u\n",
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(unsigned int) HCS_MAX_PORTS(temp));
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temp = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
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xhci_dbg(xhci, "HCSPARAMS 2: 0x%x\n",
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(unsigned int) temp);
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xhci_dbg(xhci, " Isoc scheduling threshold: %u\n",
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(unsigned int) HCS_IST(temp));
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xhci_dbg(xhci, " Maximum allowed segments in event ring: %u\n",
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(unsigned int) HCS_ERST_MAX(temp));
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temp = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
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xhci_dbg(xhci, "HCSPARAMS 3 0x%x:\n",
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(unsigned int) temp);
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xhci_dbg(xhci, " Worst case U1 device exit latency: %u\n",
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(unsigned int) HCS_U1_LATENCY(temp));
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xhci_dbg(xhci, " Worst case U2 device exit latency: %u\n",
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(unsigned int) HCS_U2_LATENCY(temp));
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temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
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xhci_dbg(xhci, "HCC PARAMS 0x%x:\n", (unsigned int) temp);
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xhci_dbg(xhci, " HC generates %s bit addresses\n",
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HCC_64BIT_ADDR(temp) ? "64" : "32");
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/* FIXME */
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xhci_dbg(xhci, " FIXME: more HCCPARAMS debugging\n");
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temp = xhci_readl(xhci, &xhci->cap_regs->run_regs_off);
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xhci_dbg(xhci, "RTSOFF 0x%x:\n", temp & RTSOFF_MASK);
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}
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void xhci_print_command_reg(struct xhci_hcd *xhci)
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{
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u32 temp;
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temp = xhci_readl(xhci, &xhci->op_regs->command);
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xhci_dbg(xhci, "USBCMD 0x%x:\n", temp);
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xhci_dbg(xhci, " HC is %s\n",
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(temp & CMD_RUN) ? "running" : "being stopped");
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xhci_dbg(xhci, " HC has %sfinished hard reset\n",
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(temp & CMD_RESET) ? "not " : "");
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xhci_dbg(xhci, " Event Interrupts %s\n",
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(temp & CMD_EIE) ? "enabled " : "disabled");
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xhci_dbg(xhci, " Host System Error Interrupts %s\n",
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(temp & CMD_EIE) ? "enabled " : "disabled");
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xhci_dbg(xhci, " HC has %sfinished light reset\n",
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(temp & CMD_LRESET) ? "not " : "");
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}
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void xhci_print_status(struct xhci_hcd *xhci)
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{
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u32 temp;
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temp = xhci_readl(xhci, &xhci->op_regs->status);
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xhci_dbg(xhci, "USBSTS 0x%x:\n", temp);
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xhci_dbg(xhci, " Event ring is %sempty\n",
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(temp & STS_EINT) ? "not " : "");
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xhci_dbg(xhci, " %sHost System Error\n",
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(temp & STS_FATAL) ? "WARNING: " : "No ");
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xhci_dbg(xhci, " HC is %s\n",
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(temp & STS_HALT) ? "halted" : "running");
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}
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void xhci_print_op_regs(struct xhci_hcd *xhci)
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{
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xhci_dbg(xhci, "xHCI operational registers at 0x%x:\n",
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(unsigned int) xhci->op_regs);
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xhci_print_command_reg(xhci);
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xhci_print_status(xhci);
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}
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void xhci_print_ir_set(struct xhci_hcd *xhci, struct intr_reg *ir_set, int set_num)
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{
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void *addr;
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u32 temp;
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addr = &ir_set->irq_pending;
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temp = xhci_readl(xhci, addr);
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if (temp == XHCI_INIT_VALUE)
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return;
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xhci_dbg(xhci, " 0x%x: ir_set[%i]\n", (unsigned int) ir_set, set_num);
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xhci_dbg(xhci, " 0x%x: ir_set.pending = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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addr = &ir_set->irq_control;
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temp = xhci_readl(xhci, addr);
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xhci_dbg(xhci, " 0x%x: ir_set.control = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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addr = &ir_set->erst_size;
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temp = xhci_readl(xhci, addr);
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xhci_dbg(xhci, " 0x%x: ir_set.erst_size = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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addr = &ir_set->rsvd;
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temp = xhci_readl(xhci, addr);
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if (temp != XHCI_INIT_VALUE)
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xhci_dbg(xhci, " WARN: 0x%x: ir_set.rsvd = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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addr = &ir_set->erst_base[0];
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temp = xhci_readl(xhci, addr);
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xhci_dbg(xhci, " 0x%x: ir_set.erst_base[0] = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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addr = &ir_set->erst_base[1];
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temp = xhci_readl(xhci, addr);
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xhci_dbg(xhci, " 0x%x: ir_set.erst_base[1] = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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addr = &ir_set->erst_dequeue[0];
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temp = xhci_readl(xhci, addr);
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xhci_dbg(xhci, " 0x%x: ir_set.erst_dequeue[0] = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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addr = &ir_set->erst_dequeue[1];
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temp = xhci_readl(xhci, addr);
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xhci_dbg(xhci, " 0x%x: ir_set.erst_dequeue[1] = 0x%x\n",
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(unsigned int) addr, (unsigned int) temp);
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}
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void xhci_print_run_regs(struct xhci_hcd *xhci)
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{
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u32 temp;
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int i;
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xhci_dbg(xhci, "xHCI runtime registers at 0x%x:\n",
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(unsigned int) xhci->run_regs);
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temp = xhci_readl(xhci, &xhci->run_regs->microframe_index);
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xhci_dbg(xhci, " 0x%x: Microframe index = 0x%x\n",
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(unsigned int) &xhci->run_regs->microframe_index,
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(unsigned int) temp);
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for (i = 0; i < 7; ++i) {
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temp = xhci_readl(xhci, &xhci->run_regs->rsvd[i]);
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if (temp != XHCI_INIT_VALUE)
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xhci_dbg(xhci, " WARN: 0x%x: Rsvd[%i] = 0x%x\n",
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(unsigned int) &xhci->run_regs->rsvd[i],
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i, (unsigned int) temp);
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}
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}
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void xhci_print_registers(struct xhci_hcd *xhci)
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{
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xhci_print_cap_regs(xhci);
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xhci_print_op_regs(xhci);
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}
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void xhci_print_trb_offsets(struct xhci_hcd *xhci, union xhci_trb *trb)
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{
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int i;
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for (i = 0; i < 4; ++i)
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xhci_dbg(xhci, "Offset 0x%x = 0x%x\n",
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i*4, trb->generic.field[i]);
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}
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/**
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* Debug a transfer request block (TRB).
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*/
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void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb)
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{
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u64 address;
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u32 type = xhci_readl(xhci, &trb->link.control) & TRB_TYPE_BITMASK;
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switch (type) {
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case TRB_TYPE(TRB_LINK):
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xhci_dbg(xhci, "Link TRB:\n");
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xhci_print_trb_offsets(xhci, trb);
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address = trb->link.segment_ptr[0] +
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(((u64) trb->link.segment_ptr[1]) << 32);
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xhci_dbg(xhci, "Next ring segment DMA address = 0x%llx\n", address);
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xhci_dbg(xhci, "Interrupter target = 0x%x\n",
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GET_INTR_TARGET(trb->link.intr_target));
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xhci_dbg(xhci, "Cycle bit = %u\n",
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(unsigned int) (trb->link.control & TRB_CYCLE));
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xhci_dbg(xhci, "Toggle cycle bit = %u\n",
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(unsigned int) (trb->link.control & LINK_TOGGLE));
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xhci_dbg(xhci, "No Snoop bit = %u\n",
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(unsigned int) (trb->link.control & TRB_NO_SNOOP));
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break;
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case TRB_TYPE(TRB_TRANSFER):
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address = trb->trans_event.buffer[0] +
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(((u64) trb->trans_event.buffer[1]) << 32);
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/*
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* FIXME: look at flags to figure out if it's an address or if
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* the data is directly in the buffer field.
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*/
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xhci_dbg(xhci, "DMA address or buffer contents= %llu\n", address);
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break;
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case TRB_TYPE(TRB_COMPLETION):
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address = trb->event_cmd.cmd_trb[0] +
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(((u64) trb->event_cmd.cmd_trb[1]) << 32);
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xhci_dbg(xhci, "Command TRB pointer = %llu\n", address);
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xhci_dbg(xhci, "Completion status = %u\n",
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(unsigned int) GET_COMP_CODE(trb->event_cmd.status));
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xhci_dbg(xhci, "Flags = 0x%x\n", (unsigned int) trb->event_cmd.flags);
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break;
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default:
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xhci_dbg(xhci, "Unknown TRB with TRB type ID %u\n",
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(unsigned int) type>>10);
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xhci_print_trb_offsets(xhci, trb);
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break;
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}
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}
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/**
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* Debug a segment with an xHCI ring.
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*
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* @return The Link TRB of the segment, or NULL if there is no Link TRB
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* (which is a bug, since all segments must have a Link TRB).
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*
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* Prints out all TRBs in the segment, even those after the Link TRB.
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*
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* XXX: should we print out TRBs that the HC owns? As long as we don't
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* write, that should be fine... We shouldn't expect that the memory pointed to
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* by the TRB is valid at all. Do we care about ones the HC owns? Probably,
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* for HC debugging.
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*/
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void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg)
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{
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int i;
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u32 addr = (u32) seg->dma;
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union xhci_trb *trb = seg->trbs;
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for (i = 0; i < TRBS_PER_SEGMENT; ++i) {
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trb = &seg->trbs[i];
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xhci_dbg(xhci, "@%08x %08x %08x %08x %08x\n", addr,
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(unsigned int) trb->link.segment_ptr[0],
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(unsigned int) trb->link.segment_ptr[1],
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(unsigned int) trb->link.intr_target,
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(unsigned int) trb->link.control);
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addr += sizeof(*trb);
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}
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}
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void xhci_dbg_ring_ptrs(struct xhci_hcd *xhci, struct xhci_ring *ring)
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{
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xhci_dbg(xhci, "Ring deq = 0x%x (virt), 0x%x (dma)\n",
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(unsigned int) ring->dequeue,
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trb_virt_to_dma(ring->deq_seg, ring->dequeue));
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xhci_dbg(xhci, "Ring deq updated %u times\n",
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ring->deq_updates);
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xhci_dbg(xhci, "Ring enq = 0x%x (virt), 0x%x (dma)\n",
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(unsigned int) ring->enqueue,
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trb_virt_to_dma(ring->enq_seg, ring->enqueue));
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xhci_dbg(xhci, "Ring enq updated %u times\n",
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ring->enq_updates);
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}
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/**
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* Debugging for an xHCI ring, which is a queue broken into multiple segments.
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*
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* Print out each segment in the ring. Check that the DMA address in
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* each link segment actually matches the segment's stored DMA address.
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* Check that the link end bit is only set at the end of the ring.
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* Check that the dequeue and enqueue pointers point to real data in this ring
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* (not some other ring).
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*/
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void xhci_debug_ring(struct xhci_hcd *xhci, struct xhci_ring *ring)
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{
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/* FIXME: Throw an error if any segment doesn't have a Link TRB */
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struct xhci_segment *seg;
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struct xhci_segment *first_seg = ring->first_seg;
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xhci_debug_segment(xhci, first_seg);
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if (!ring->enq_updates && !ring->deq_updates) {
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xhci_dbg(xhci, " Ring has not been updated\n");
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return;
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}
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for (seg = first_seg->next; seg != first_seg; seg = seg->next)
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xhci_debug_segment(xhci, seg);
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}
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void xhci_dbg_erst(struct xhci_hcd *xhci, struct xhci_erst *erst)
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{
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u32 addr = (u32) erst->erst_dma_addr;
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int i;
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struct xhci_erst_entry *entry;
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for (i = 0; i < erst->num_entries; ++i) {
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entry = &erst->entries[i];
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xhci_dbg(xhci, "@%08x %08x %08x %08x %08x\n",
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(unsigned int) addr,
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(unsigned int) entry->seg_addr[0],
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(unsigned int) entry->seg_addr[1],
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(unsigned int) entry->seg_size,
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(unsigned int) entry->rsvd);
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addr += sizeof(*entry);
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}
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}
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void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci)
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{
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u32 val;
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val = xhci_readl(xhci, &xhci->op_regs->cmd_ring[0]);
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xhci_dbg(xhci, "// xHC command ring deq ptr low bits + flags = 0x%x\n", val);
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val = xhci_readl(xhci, &xhci->op_regs->cmd_ring[1]);
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xhci_dbg(xhci, "// xHC command ring deq ptr high bits = 0x%x\n", val);
|
|
}
|