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![Pali Rohár](/assets/img/avatar_default.png)
mvebu and aardvark HW have PCIe capabilities on different offset in PCI config space. Extend pci-bridge-emul.c code to allow setting custom driver custom value where PCIe capabilities starts. With this change PCIe capabilities of both drivers are reported at the same location as where they are reported by U-Boot - in their real HW offset. Link: https://lore.kernel.org/r/20220824112124.21675-1-pali@kernel.org Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
621 lines
18 KiB
C
621 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Marvell
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*
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* Author: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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*
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* This file helps PCI controller drivers implement a fake root port
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* PCI bridge when the HW doesn't provide such a root port PCI
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* bridge.
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*
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* It emulates a PCI bridge by providing a fake PCI configuration
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* space (and optionally a PCIe capability configuration space) in
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* memory. By default the read/write operations simply read and update
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* this fake configuration space in memory. However, PCI controller
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* drivers can provide through the 'struct pci_sw_bridge_ops'
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* structure a set of operations to override or complement this
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* default behavior.
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*/
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#include <linux/pci.h>
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#include "pci-bridge-emul.h"
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#define PCI_BRIDGE_CONF_END PCI_STD_HEADER_SIZEOF
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#define PCI_CAP_SSID_SIZEOF (PCI_SSVID_DEVICE_ID + 2)
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#define PCI_CAP_PCIE_SIZEOF (PCI_EXP_SLTSTA2 + 2)
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/**
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* struct pci_bridge_reg_behavior - register bits behaviors
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* @ro: Read-Only bits
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* @rw: Read-Write bits
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* @w1c: Write-1-to-Clear bits
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*
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* Reads and Writes will be filtered by specified behavior. All other bits not
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* declared are assumed 'Reserved' and will return 0 on reads, per PCIe 5.0:
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* "Reserved register fields must be read only and must return 0 (all 0's for
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* multi-bit fields) when read".
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*/
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struct pci_bridge_reg_behavior {
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/* Read-only bits */
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u32 ro;
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/* Read-write bits */
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u32 rw;
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/* Write-1-to-clear bits */
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u32 w1c;
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};
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static const
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struct pci_bridge_reg_behavior pci_regs_behavior[PCI_STD_HEADER_SIZEOF / 4] = {
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[PCI_VENDOR_ID / 4] = { .ro = ~0 },
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[PCI_COMMAND / 4] = {
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.rw = (PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
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PCI_COMMAND_MASTER | PCI_COMMAND_PARITY |
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PCI_COMMAND_SERR),
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.ro = ((PCI_COMMAND_SPECIAL | PCI_COMMAND_INVALIDATE |
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PCI_COMMAND_VGA_PALETTE | PCI_COMMAND_WAIT |
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PCI_COMMAND_FAST_BACK) |
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(PCI_STATUS_CAP_LIST | PCI_STATUS_66MHZ |
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PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MASK) << 16),
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.w1c = PCI_STATUS_ERROR_BITS << 16,
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},
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[PCI_CLASS_REVISION / 4] = { .ro = ~0 },
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/*
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* Cache Line Size register: implement as read-only, we do not
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* pretend implementing "Memory Write and Invalidate"
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* transactions"
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*
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* Latency Timer Register: implemented as read-only, as "A
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* bridge that is not capable of a burst transfer of more than
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* two data phases on its primary interface is permitted to
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* hardwire the Latency Timer to a value of 16 or less"
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*
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* Header Type: always read-only
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*
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* BIST register: implemented as read-only, as "A bridge that
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* does not support BIST must implement this register as a
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* read-only register that returns 0 when read"
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*/
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[PCI_CACHE_LINE_SIZE / 4] = { .ro = ~0 },
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/*
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* Base Address registers not used must be implemented as
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* read-only registers that return 0 when read.
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*/
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[PCI_BASE_ADDRESS_0 / 4] = { .ro = ~0 },
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[PCI_BASE_ADDRESS_1 / 4] = { .ro = ~0 },
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[PCI_PRIMARY_BUS / 4] = {
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/* Primary, secondary and subordinate bus are RW */
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.rw = GENMASK(24, 0),
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/* Secondary latency is read-only */
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.ro = GENMASK(31, 24),
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},
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[PCI_IO_BASE / 4] = {
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/* The high four bits of I/O base/limit are RW */
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.rw = (GENMASK(15, 12) | GENMASK(7, 4)),
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/* The low four bits of I/O base/limit are RO */
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.ro = (((PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK |
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PCI_STATUS_DEVSEL_MASK) << 16) |
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GENMASK(11, 8) | GENMASK(3, 0)),
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.w1c = PCI_STATUS_ERROR_BITS << 16,
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},
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[PCI_MEMORY_BASE / 4] = {
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/* The high 12-bits of mem base/limit are RW */
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.rw = GENMASK(31, 20) | GENMASK(15, 4),
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/* The low four bits of mem base/limit are RO */
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.ro = GENMASK(19, 16) | GENMASK(3, 0),
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},
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[PCI_PREF_MEMORY_BASE / 4] = {
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/* The high 12-bits of pref mem base/limit are RW */
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.rw = GENMASK(31, 20) | GENMASK(15, 4),
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/* The low four bits of pref mem base/limit are RO */
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.ro = GENMASK(19, 16) | GENMASK(3, 0),
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},
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[PCI_PREF_BASE_UPPER32 / 4] = {
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.rw = ~0,
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},
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[PCI_PREF_LIMIT_UPPER32 / 4] = {
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.rw = ~0,
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},
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[PCI_IO_BASE_UPPER16 / 4] = {
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.rw = ~0,
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},
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[PCI_CAPABILITY_LIST / 4] = {
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.ro = GENMASK(7, 0),
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},
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/*
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* If expansion ROM is unsupported then ROM Base Address register must
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* be implemented as read-only register that return 0 when read, same
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* as for unused Base Address registers.
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*/
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[PCI_ROM_ADDRESS1 / 4] = {
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.ro = ~0,
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},
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/*
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* Interrupt line (bits 7:0) are RW, interrupt pin (bits 15:8)
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* are RO, and bridge control (31:16) are a mix of RW, RO,
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* reserved and W1C bits
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*/
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[PCI_INTERRUPT_LINE / 4] = {
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/* Interrupt line is RW */
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.rw = (GENMASK(7, 0) |
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((PCI_BRIDGE_CTL_PARITY |
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PCI_BRIDGE_CTL_SERR |
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PCI_BRIDGE_CTL_ISA |
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PCI_BRIDGE_CTL_VGA |
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PCI_BRIDGE_CTL_MASTER_ABORT |
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PCI_BRIDGE_CTL_BUS_RESET |
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BIT(8) | BIT(9) | BIT(11)) << 16)),
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/* Interrupt pin is RO */
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.ro = (GENMASK(15, 8) | ((PCI_BRIDGE_CTL_FAST_BACK) << 16)),
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.w1c = BIT(10) << 16,
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},
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};
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static const
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struct pci_bridge_reg_behavior pcie_cap_regs_behavior[PCI_CAP_PCIE_SIZEOF / 4] = {
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[PCI_CAP_LIST_ID / 4] = {
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/*
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* Capability ID, Next Capability Pointer and
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* bits [14:0] of Capabilities register are all read-only.
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* Bit 15 of Capabilities register is reserved.
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*/
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.ro = GENMASK(30, 0),
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},
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[PCI_EXP_DEVCAP / 4] = {
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/*
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* Bits [31:29] and [17:16] are reserved.
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* Bits [27:18] are reserved for non-upstream ports.
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* Bits 28 and [14:6] are reserved for non-endpoint devices.
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* Other bits are read-only.
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*/
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.ro = BIT(15) | GENMASK(5, 0),
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},
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[PCI_EXP_DEVCTL / 4] = {
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/*
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* Device control register is RW, except bit 15 which is
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* reserved for non-endpoints or non-PCIe-to-PCI/X bridges.
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*/
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.rw = GENMASK(14, 0),
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/*
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* Device status register has bits 6 and [3:0] W1C, [5:4] RO,
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* the rest is reserved. Also bit 6 is reserved for non-upstream
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* ports.
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*/
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.w1c = GENMASK(3, 0) << 16,
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.ro = GENMASK(5, 4) << 16,
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},
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[PCI_EXP_LNKCAP / 4] = {
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/*
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* All bits are RO, except bit 23 which is reserved and
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* bit 18 which is reserved for non-upstream ports.
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*/
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.ro = lower_32_bits(~(BIT(23) | PCI_EXP_LNKCAP_CLKPM)),
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},
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[PCI_EXP_LNKCTL / 4] = {
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/*
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* Link control has bits [15:14], [11:3] and [1:0] RW, the
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* rest is reserved. Bit 8 is reserved for non-upstream ports.
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*
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* Link status has bits [13:0] RO, and bits [15:14]
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* W1C.
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*/
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.rw = GENMASK(15, 14) | GENMASK(11, 9) | GENMASK(7, 3) | GENMASK(1, 0),
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.ro = GENMASK(13, 0) << 16,
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.w1c = GENMASK(15, 14) << 16,
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},
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[PCI_EXP_SLTCAP / 4] = {
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.ro = ~0,
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},
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[PCI_EXP_SLTCTL / 4] = {
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/*
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* Slot control has bits [14:0] RW, the rest is
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* reserved.
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*
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* Slot status has bits 8 and [4:0] W1C, bits [7:5] RO, the
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* rest is reserved.
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*/
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.rw = GENMASK(14, 0),
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.w1c = (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
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PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC |
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PCI_EXP_SLTSTA_CC | PCI_EXP_SLTSTA_DLLSC) << 16,
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.ro = (PCI_EXP_SLTSTA_MRLSS | PCI_EXP_SLTSTA_PDS |
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PCI_EXP_SLTSTA_EIS) << 16,
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},
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[PCI_EXP_RTCTL / 4] = {
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/*
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* Root control has bits [4:0] RW, the rest is
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* reserved.
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*
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* Root capabilities has bit 0 RO, the rest is reserved.
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*/
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.rw = (PCI_EXP_RTCTL_SECEE | PCI_EXP_RTCTL_SENFEE |
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PCI_EXP_RTCTL_SEFEE | PCI_EXP_RTCTL_PMEIE |
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PCI_EXP_RTCTL_CRSSVE),
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.ro = PCI_EXP_RTCAP_CRSVIS << 16,
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},
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[PCI_EXP_RTSTA / 4] = {
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/*
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* Root status has bits 17 and [15:0] RO, bit 16 W1C, the rest
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* is reserved.
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*/
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.ro = GENMASK(15, 0) | PCI_EXP_RTSTA_PENDING,
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.w1c = PCI_EXP_RTSTA_PME,
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},
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[PCI_EXP_DEVCAP2 / 4] = {
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/*
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* Device capabilities 2 register has reserved bits [30:27].
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* Also bits [26:24] are reserved for non-upstream ports.
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*/
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.ro = BIT(31) | GENMASK(23, 0),
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},
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[PCI_EXP_DEVCTL2 / 4] = {
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/*
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* Device control 2 register is RW. Bit 11 is reserved for
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* non-upstream ports.
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*
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* Device status 2 register is reserved.
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*/
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.rw = GENMASK(15, 12) | GENMASK(10, 0),
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},
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[PCI_EXP_LNKCAP2 / 4] = {
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/* Link capabilities 2 register has reserved bits [30:25] and 0. */
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.ro = BIT(31) | GENMASK(24, 1),
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},
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[PCI_EXP_LNKCTL2 / 4] = {
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/*
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* Link control 2 register is RW.
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*
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* Link status 2 register has bits 5, 15 W1C;
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* bits 10, 11 reserved and others are RO.
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*/
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.rw = GENMASK(15, 0),
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.w1c = (BIT(15) | BIT(5)) << 16,
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.ro = (GENMASK(14, 12) | GENMASK(9, 6) | GENMASK(4, 0)) << 16,
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},
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[PCI_EXP_SLTCAP2 / 4] = {
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/* Slot capabilities 2 register is reserved. */
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},
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[PCI_EXP_SLTCTL2 / 4] = {
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/* Both Slot control 2 and Slot status 2 registers are reserved. */
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},
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};
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static pci_bridge_emul_read_status_t
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pci_bridge_emul_read_ssid(struct pci_bridge_emul *bridge, int reg, u32 *value)
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{
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switch (reg) {
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case PCI_CAP_LIST_ID:
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*value = PCI_CAP_ID_SSVID |
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((bridge->pcie_start > bridge->ssid_start) ? (bridge->pcie_start << 8) : 0);
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return PCI_BRIDGE_EMUL_HANDLED;
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case PCI_SSVID_VENDOR_ID:
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*value = bridge->subsystem_vendor_id |
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(bridge->subsystem_id << 16);
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return PCI_BRIDGE_EMUL_HANDLED;
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default:
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return PCI_BRIDGE_EMUL_NOT_HANDLED;
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}
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}
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/*
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* Initialize a pci_bridge_emul structure to represent a fake PCI
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* bridge configuration space. The caller needs to have initialized
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* the PCI configuration space with whatever values make sense
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* (typically at least vendor, device, revision), the ->ops pointer,
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* and optionally ->data and ->has_pcie.
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*/
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int pci_bridge_emul_init(struct pci_bridge_emul *bridge,
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unsigned int flags)
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{
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BUILD_BUG_ON(sizeof(bridge->conf) != PCI_BRIDGE_CONF_END);
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/*
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* class_revision: Class is high 24 bits and revision is low 8 bit
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* of this member, while class for PCI Bridge Normal Decode has the
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* 24-bit value: PCI_CLASS_BRIDGE_PCI_NORMAL
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*/
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bridge->conf.class_revision |=
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cpu_to_le32(PCI_CLASS_BRIDGE_PCI_NORMAL << 8);
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bridge->conf.header_type = PCI_HEADER_TYPE_BRIDGE;
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bridge->conf.cache_line_size = 0x10;
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bridge->conf.status = cpu_to_le16(PCI_STATUS_CAP_LIST);
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bridge->pci_regs_behavior = kmemdup(pci_regs_behavior,
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sizeof(pci_regs_behavior),
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GFP_KERNEL);
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if (!bridge->pci_regs_behavior)
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return -ENOMEM;
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/* If ssid_start and pcie_start were not specified then choose the lowest possible value. */
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if (!bridge->ssid_start && !bridge->pcie_start) {
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if (bridge->subsystem_vendor_id)
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bridge->ssid_start = PCI_BRIDGE_CONF_END;
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if (bridge->has_pcie)
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bridge->pcie_start = bridge->ssid_start + PCI_CAP_SSID_SIZEOF;
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} else if (!bridge->ssid_start && bridge->subsystem_vendor_id) {
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if (bridge->pcie_start - PCI_BRIDGE_CONF_END >= PCI_CAP_SSID_SIZEOF)
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bridge->ssid_start = PCI_BRIDGE_CONF_END;
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else
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bridge->ssid_start = bridge->pcie_start + PCI_CAP_PCIE_SIZEOF;
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} else if (!bridge->pcie_start && bridge->has_pcie) {
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if (bridge->ssid_start - PCI_BRIDGE_CONF_END >= PCI_CAP_PCIE_SIZEOF)
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bridge->pcie_start = PCI_BRIDGE_CONF_END;
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else
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bridge->pcie_start = bridge->ssid_start + PCI_CAP_SSID_SIZEOF;
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}
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bridge->conf.capabilities_pointer = min(bridge->ssid_start, bridge->pcie_start);
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if (bridge->conf.capabilities_pointer)
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bridge->conf.status |= cpu_to_le16(PCI_STATUS_CAP_LIST);
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if (bridge->has_pcie) {
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bridge->pcie_conf.cap_id = PCI_CAP_ID_EXP;
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bridge->pcie_conf.next = (bridge->ssid_start > bridge->pcie_start) ?
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bridge->ssid_start : 0;
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bridge->pcie_conf.cap |= cpu_to_le16(PCI_EXP_TYPE_ROOT_PORT << 4);
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bridge->pcie_cap_regs_behavior =
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kmemdup(pcie_cap_regs_behavior,
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sizeof(pcie_cap_regs_behavior),
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GFP_KERNEL);
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if (!bridge->pcie_cap_regs_behavior) {
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kfree(bridge->pci_regs_behavior);
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return -ENOMEM;
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}
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/* These bits are applicable only for PCI and reserved on PCIe */
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bridge->pci_regs_behavior[PCI_CACHE_LINE_SIZE / 4].ro &=
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~GENMASK(15, 8);
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bridge->pci_regs_behavior[PCI_COMMAND / 4].ro &=
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~((PCI_COMMAND_SPECIAL | PCI_COMMAND_INVALIDATE |
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PCI_COMMAND_VGA_PALETTE | PCI_COMMAND_WAIT |
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PCI_COMMAND_FAST_BACK) |
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(PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK |
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PCI_STATUS_DEVSEL_MASK) << 16);
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bridge->pci_regs_behavior[PCI_PRIMARY_BUS / 4].ro &=
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~GENMASK(31, 24);
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bridge->pci_regs_behavior[PCI_IO_BASE / 4].ro &=
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~((PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK |
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PCI_STATUS_DEVSEL_MASK) << 16);
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bridge->pci_regs_behavior[PCI_INTERRUPT_LINE / 4].rw &=
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~((PCI_BRIDGE_CTL_MASTER_ABORT |
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BIT(8) | BIT(9) | BIT(11)) << 16);
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bridge->pci_regs_behavior[PCI_INTERRUPT_LINE / 4].ro &=
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~((PCI_BRIDGE_CTL_FAST_BACK) << 16);
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bridge->pci_regs_behavior[PCI_INTERRUPT_LINE / 4].w1c &=
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~(BIT(10) << 16);
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}
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if (flags & PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD) {
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bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].ro = ~0;
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bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].rw = 0;
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}
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if (flags & PCI_BRIDGE_EMUL_NO_IO_FORWARD) {
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bridge->pci_regs_behavior[PCI_COMMAND / 4].ro |= PCI_COMMAND_IO;
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bridge->pci_regs_behavior[PCI_COMMAND / 4].rw &= ~PCI_COMMAND_IO;
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bridge->pci_regs_behavior[PCI_IO_BASE / 4].ro |= GENMASK(15, 0);
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bridge->pci_regs_behavior[PCI_IO_BASE / 4].rw &= ~GENMASK(15, 0);
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bridge->pci_regs_behavior[PCI_IO_BASE_UPPER16 / 4].ro = ~0;
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bridge->pci_regs_behavior[PCI_IO_BASE_UPPER16 / 4].rw = 0;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(pci_bridge_emul_init);
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/*
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* Cleanup a pci_bridge_emul structure that was previously initialized
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* using pci_bridge_emul_init().
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*/
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void pci_bridge_emul_cleanup(struct pci_bridge_emul *bridge)
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{
|
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if (bridge->has_pcie)
|
|
kfree(bridge->pcie_cap_regs_behavior);
|
|
kfree(bridge->pci_regs_behavior);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_bridge_emul_cleanup);
|
|
|
|
/*
|
|
* Should be called by the PCI controller driver when reading the PCI
|
|
* configuration space of the fake bridge. It will call back the
|
|
* ->ops->read_base or ->ops->read_pcie operations.
|
|
*/
|
|
int pci_bridge_emul_conf_read(struct pci_bridge_emul *bridge, int where,
|
|
int size, u32 *value)
|
|
{
|
|
int ret;
|
|
int reg = where & ~3;
|
|
pci_bridge_emul_read_status_t (*read_op)(struct pci_bridge_emul *bridge,
|
|
int reg, u32 *value);
|
|
__le32 *cfgspace;
|
|
const struct pci_bridge_reg_behavior *behavior;
|
|
|
|
if (reg < PCI_BRIDGE_CONF_END) {
|
|
/* Emulated PCI space */
|
|
read_op = bridge->ops->read_base;
|
|
cfgspace = (__le32 *) &bridge->conf;
|
|
behavior = bridge->pci_regs_behavior;
|
|
} else if (reg >= bridge->ssid_start && reg < bridge->ssid_start + PCI_CAP_SSID_SIZEOF &&
|
|
bridge->subsystem_vendor_id) {
|
|
/* Emulated PCI Bridge Subsystem Vendor ID capability */
|
|
reg -= bridge->ssid_start;
|
|
read_op = pci_bridge_emul_read_ssid;
|
|
cfgspace = NULL;
|
|
behavior = NULL;
|
|
} else if (reg >= bridge->pcie_start && reg < bridge->pcie_start + PCI_CAP_PCIE_SIZEOF &&
|
|
bridge->has_pcie) {
|
|
/* Our emulated PCIe capability */
|
|
reg -= bridge->pcie_start;
|
|
read_op = bridge->ops->read_pcie;
|
|
cfgspace = (__le32 *) &bridge->pcie_conf;
|
|
behavior = bridge->pcie_cap_regs_behavior;
|
|
} else if (reg >= PCI_CFG_SPACE_SIZE && bridge->has_pcie) {
|
|
/* PCIe extended capability space */
|
|
reg -= PCI_CFG_SPACE_SIZE;
|
|
read_op = bridge->ops->read_ext;
|
|
cfgspace = NULL;
|
|
behavior = NULL;
|
|
} else {
|
|
/* Not implemented */
|
|
*value = 0;
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
if (read_op)
|
|
ret = read_op(bridge, reg, value);
|
|
else
|
|
ret = PCI_BRIDGE_EMUL_NOT_HANDLED;
|
|
|
|
if (ret == PCI_BRIDGE_EMUL_NOT_HANDLED) {
|
|
if (cfgspace)
|
|
*value = le32_to_cpu(cfgspace[reg / 4]);
|
|
else
|
|
*value = 0;
|
|
}
|
|
|
|
/*
|
|
* Make sure we never return any reserved bit with a value
|
|
* different from 0.
|
|
*/
|
|
if (behavior)
|
|
*value &= behavior[reg / 4].ro | behavior[reg / 4].rw |
|
|
behavior[reg / 4].w1c;
|
|
|
|
if (size == 1)
|
|
*value = (*value >> (8 * (where & 3))) & 0xff;
|
|
else if (size == 2)
|
|
*value = (*value >> (8 * (where & 3))) & 0xffff;
|
|
else if (size != 4)
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_bridge_emul_conf_read);
|
|
|
|
/*
|
|
* Should be called by the PCI controller driver when writing the PCI
|
|
* configuration space of the fake bridge. It will call back the
|
|
* ->ops->write_base or ->ops->write_pcie operations.
|
|
*/
|
|
int pci_bridge_emul_conf_write(struct pci_bridge_emul *bridge, int where,
|
|
int size, u32 value)
|
|
{
|
|
int reg = where & ~3;
|
|
int mask, ret, old, new, shift;
|
|
void (*write_op)(struct pci_bridge_emul *bridge, int reg,
|
|
u32 old, u32 new, u32 mask);
|
|
__le32 *cfgspace;
|
|
const struct pci_bridge_reg_behavior *behavior;
|
|
|
|
ret = pci_bridge_emul_conf_read(bridge, reg, 4, &old);
|
|
if (ret != PCIBIOS_SUCCESSFUL)
|
|
return ret;
|
|
|
|
if (reg < PCI_BRIDGE_CONF_END) {
|
|
/* Emulated PCI space */
|
|
write_op = bridge->ops->write_base;
|
|
cfgspace = (__le32 *) &bridge->conf;
|
|
behavior = bridge->pci_regs_behavior;
|
|
} else if (reg >= bridge->pcie_start && reg < bridge->pcie_start + PCI_CAP_PCIE_SIZEOF &&
|
|
bridge->has_pcie) {
|
|
/* Our emulated PCIe capability */
|
|
reg -= bridge->pcie_start;
|
|
write_op = bridge->ops->write_pcie;
|
|
cfgspace = (__le32 *) &bridge->pcie_conf;
|
|
behavior = bridge->pcie_cap_regs_behavior;
|
|
} else if (reg >= PCI_CFG_SPACE_SIZE && bridge->has_pcie) {
|
|
/* PCIe extended capability space */
|
|
reg -= PCI_CFG_SPACE_SIZE;
|
|
write_op = bridge->ops->write_ext;
|
|
cfgspace = NULL;
|
|
behavior = NULL;
|
|
} else {
|
|
/* Not implemented */
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
shift = (where & 0x3) * 8;
|
|
|
|
if (size == 4)
|
|
mask = 0xffffffff;
|
|
else if (size == 2)
|
|
mask = 0xffff << shift;
|
|
else if (size == 1)
|
|
mask = 0xff << shift;
|
|
else
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
if (behavior) {
|
|
/* Keep all bits, except the RW bits */
|
|
new = old & (~mask | ~behavior[reg / 4].rw);
|
|
|
|
/* Update the value of the RW bits */
|
|
new |= (value << shift) & (behavior[reg / 4].rw & mask);
|
|
|
|
/* Clear the W1C bits */
|
|
new &= ~((value << shift) & (behavior[reg / 4].w1c & mask));
|
|
} else {
|
|
new = old & ~mask;
|
|
new |= (value << shift) & mask;
|
|
}
|
|
|
|
if (cfgspace) {
|
|
/* Save the new value with the cleared W1C bits into the cfgspace */
|
|
cfgspace[reg / 4] = cpu_to_le32(new);
|
|
}
|
|
|
|
if (behavior) {
|
|
/*
|
|
* Clear the W1C bits not specified by the write mask, so that the
|
|
* write_op() does not clear them.
|
|
*/
|
|
new &= ~(behavior[reg / 4].w1c & ~mask);
|
|
|
|
/*
|
|
* Set the W1C bits specified by the write mask, so that write_op()
|
|
* knows about that they are to be cleared.
|
|
*/
|
|
new |= (value << shift) & (behavior[reg / 4].w1c & mask);
|
|
}
|
|
|
|
if (write_op)
|
|
write_op(bridge, reg, old, new, mask);
|
|
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_bridge_emul_conf_write);
|