114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <linux/io.h>
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#include "ipmi_si.h"
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static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
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{
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unsigned int addr = io->addr_data;
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return inb(addr + (offset * io->regspacing));
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}
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static void port_outb(const struct si_sm_io *io, unsigned int offset,
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unsigned char b)
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{
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unsigned int addr = io->addr_data;
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outb(b, addr + (offset * io->regspacing));
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}
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static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset)
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{
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unsigned int addr = io->addr_data;
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return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
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}
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static void port_outw(const struct si_sm_io *io, unsigned int offset,
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unsigned char b)
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{
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unsigned int addr = io->addr_data;
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outw(b << io->regshift, addr + (offset * io->regspacing));
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}
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static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset)
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{
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unsigned int addr = io->addr_data;
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return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
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}
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static void port_outl(const struct si_sm_io *io, unsigned int offset,
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unsigned char b)
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{
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unsigned int addr = io->addr_data;
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outl(b << io->regshift, addr+(offset * io->regspacing));
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}
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static void port_cleanup(struct si_sm_io *io)
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{
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unsigned int addr = io->addr_data;
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int idx;
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if (addr) {
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for (idx = 0; idx < io->io_size; idx++)
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release_region(addr + idx * io->regspacing,
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io->regsize);
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}
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}
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int ipmi_si_port_setup(struct si_sm_io *io)
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{
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unsigned int addr = io->addr_data;
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int idx;
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if (!addr)
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return -ENODEV;
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io->io_cleanup = port_cleanup;
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/*
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* Figure out the actual inb/inw/inl/etc routine to use based
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* upon the register size.
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*/
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switch (io->regsize) {
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case 1:
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io->inputb = port_inb;
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io->outputb = port_outb;
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break;
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case 2:
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io->inputb = port_inw;
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io->outputb = port_outw;
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break;
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case 4:
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io->inputb = port_inl;
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io->outputb = port_outl;
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break;
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default:
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dev_warn(io->dev, "Invalid register size: %d\n",
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io->regsize);
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return -EINVAL;
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}
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/*
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* Some BIOSes reserve disjoint I/O regions in their ACPI
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* tables. This causes problems when trying to register the
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* entire I/O region. Therefore we must register each I/O
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* port separately.
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*/
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for (idx = 0; idx < io->io_size; idx++) {
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if (request_region(addr + idx * io->regspacing,
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io->regsize, DEVICE_NAME) == NULL) {
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/* Undo allocations */
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while (idx--)
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release_region(addr + idx * io->regspacing,
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io->regsize);
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return -EIO;
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}
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}
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return 0;
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}
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