341 lines
8.6 KiB
C
341 lines
8.6 KiB
C
/***************************************************************************
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* Copyright (C) 2010-2011 Hans de Goede <hdegoede@redhat.com> *
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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 as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License 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 *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include "sch56xx-common.h"
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#define SIO_SCH56XX_LD_EM 0x0C /* Embedded uController Logical Dev */
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#define SIO_UNLOCK_KEY 0x55 /* Key to enable Super-I/O */
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#define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
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#define SIO_REG_LDSEL 0x07 /* Logical device select */
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#define SIO_REG_DEVID 0x20 /* Device ID */
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#define SIO_REG_ENABLE 0x30 /* Logical device enable */
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#define SIO_REG_ADDR 0x66 /* Logical device address (2 bytes) */
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#define SIO_SCH5627_ID 0xC6 /* Chipset ID */
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#define SIO_SCH5636_ID 0xC7 /* Chipset ID */
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#define REGION_LENGTH 9
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#define SCH56XX_CMD_READ 0x02
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#define SCH56XX_CMD_WRITE 0x03
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static struct platform_device *sch56xx_pdev;
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/* Super I/O functions */
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static inline int superio_inb(int base, int reg)
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{
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outb(reg, base);
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return inb(base + 1);
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}
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static inline int superio_enter(int base)
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{
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/* Don't step on other drivers' I/O space by accident */
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if (!request_muxed_region(base, 2, "sch56xx")) {
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pr_err("I/O address 0x%04x already in use\n", base);
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return -EBUSY;
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}
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outb(SIO_UNLOCK_KEY, base);
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return 0;
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}
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static inline void superio_select(int base, int ld)
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{
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outb(SIO_REG_LDSEL, base);
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outb(ld, base + 1);
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}
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static inline void superio_exit(int base)
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{
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outb(SIO_LOCK_KEY, base);
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release_region(base, 2);
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}
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static int sch56xx_send_cmd(u16 addr, u8 cmd, u16 reg, u8 v)
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{
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u8 val;
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int i;
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/*
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* According to SMSC for the commands we use the maximum time for
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* the EM to respond is 15 ms, but testing shows in practice it
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* responds within 15-32 reads, so we first busy poll, and if
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* that fails sleep a bit and try again until we are way past
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* the 15 ms maximum response time.
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*/
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const int max_busy_polls = 64;
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const int max_lazy_polls = 32;
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/* (Optional) Write-Clear the EC to Host Mailbox Register */
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val = inb(addr + 1);
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outb(val, addr + 1);
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/* Set Mailbox Address Pointer to first location in Region 1 */
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outb(0x00, addr + 2);
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outb(0x80, addr + 3);
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/* Write Request Packet Header */
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outb(cmd, addr + 4); /* VREG Access Type read:0x02 write:0x03 */
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outb(0x01, addr + 5); /* # of Entries: 1 Byte (8-bit) */
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outb(0x04, addr + 2); /* Mailbox AP to first data entry loc. */
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/* Write Value field */
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if (cmd == SCH56XX_CMD_WRITE)
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outb(v, addr + 4);
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/* Write Address field */
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outb(reg & 0xff, addr + 6);
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outb(reg >> 8, addr + 7);
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/* Execute the Random Access Command */
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outb(0x01, addr); /* Write 01h to the Host-to-EC register */
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/* EM Interface Polling "Algorithm" */
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for (i = 0; i < max_busy_polls + max_lazy_polls; i++) {
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if (i >= max_busy_polls)
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msleep(1);
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/* Read Interrupt source Register */
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val = inb(addr + 8);
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/* Write Clear the interrupt source bits */
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if (val)
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outb(val, addr + 8);
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/* Command Completed ? */
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if (val & 0x01)
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break;
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}
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if (i == max_busy_polls + max_lazy_polls) {
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pr_err("Max retries exceeded reading virtual "
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"register 0x%04hx (%d)\n", reg, 1);
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return -EIO;
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}
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/*
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* According to SMSC we may need to retry this, but sofar I've always
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* seen this succeed in 1 try.
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*/
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for (i = 0; i < max_busy_polls; i++) {
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/* Read EC-to-Host Register */
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val = inb(addr + 1);
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/* Command Completed ? */
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if (val == 0x01)
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break;
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if (i == 0)
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pr_warn("EC reports: 0x%02x reading virtual register "
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"0x%04hx\n", (unsigned int)val, reg);
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}
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if (i == max_busy_polls) {
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pr_err("Max retries exceeded reading virtual "
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"register 0x%04hx (%d)\n", reg, 2);
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return -EIO;
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}
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/*
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* According to the SMSC app note we should now do:
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*
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* Set Mailbox Address Pointer to first location in Region 1 *
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* outb(0x00, addr + 2);
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* outb(0x80, addr + 3);
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*
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* But if we do that things don't work, so let's not.
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*/
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/* Read Value field */
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if (cmd == SCH56XX_CMD_READ)
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return inb(addr + 4);
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return 0;
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}
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int sch56xx_read_virtual_reg(u16 addr, u16 reg)
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{
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return sch56xx_send_cmd(addr, SCH56XX_CMD_READ, reg, 0);
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}
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EXPORT_SYMBOL(sch56xx_read_virtual_reg);
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int sch56xx_write_virtual_reg(u16 addr, u16 reg, u8 val)
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{
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return sch56xx_send_cmd(addr, SCH56XX_CMD_WRITE, reg, val);
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}
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EXPORT_SYMBOL(sch56xx_write_virtual_reg);
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int sch56xx_read_virtual_reg16(u16 addr, u16 reg)
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{
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int lsb, msb;
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/* Read LSB first, this will cause the matching MSB to be latched */
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lsb = sch56xx_read_virtual_reg(addr, reg);
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if (lsb < 0)
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return lsb;
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msb = sch56xx_read_virtual_reg(addr, reg + 1);
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if (msb < 0)
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return msb;
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return lsb | (msb << 8);
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}
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EXPORT_SYMBOL(sch56xx_read_virtual_reg16);
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int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg,
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int high_nibble)
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{
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int msb, lsn;
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/* Read MSB first, this will cause the matching LSN to be latched */
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msb = sch56xx_read_virtual_reg(addr, msb_reg);
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if (msb < 0)
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return msb;
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lsn = sch56xx_read_virtual_reg(addr, lsn_reg);
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if (lsn < 0)
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return lsn;
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if (high_nibble)
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return (msb << 4) | (lsn >> 4);
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else
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return (msb << 4) | (lsn & 0x0f);
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}
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EXPORT_SYMBOL(sch56xx_read_virtual_reg12);
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static int __init sch56xx_find(int sioaddr, unsigned short *address,
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const char **name)
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{
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u8 devid;
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int err;
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err = superio_enter(sioaddr);
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if (err)
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return err;
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devid = superio_inb(sioaddr, SIO_REG_DEVID);
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switch (devid) {
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case SIO_SCH5627_ID:
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*name = "sch5627";
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break;
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case SIO_SCH5636_ID:
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*name = "sch5636";
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break;
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default:
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pr_debug("Unsupported device id: 0x%02x\n",
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(unsigned int)devid);
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err = -ENODEV;
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goto exit;
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}
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superio_select(sioaddr, SIO_SCH56XX_LD_EM);
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if (!(superio_inb(sioaddr, SIO_REG_ENABLE) & 0x01)) {
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pr_warn("Device not activated\n");
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err = -ENODEV;
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goto exit;
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}
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/*
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* Warning the order of the low / high byte is the other way around
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* as on most other superio devices!!
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*/
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*address = superio_inb(sioaddr, SIO_REG_ADDR) |
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superio_inb(sioaddr, SIO_REG_ADDR + 1) << 8;
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if (*address == 0) {
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pr_warn("Base address not set\n");
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err = -ENODEV;
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goto exit;
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}
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exit:
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superio_exit(sioaddr);
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return err;
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}
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static int __init sch56xx_device_add(unsigned short address, const char *name)
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{
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struct resource res = {
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.start = address,
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.end = address + REGION_LENGTH - 1,
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.flags = IORESOURCE_IO,
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};
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int err;
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sch56xx_pdev = platform_device_alloc(name, address);
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if (!sch56xx_pdev)
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return -ENOMEM;
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res.name = sch56xx_pdev->name;
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err = acpi_check_resource_conflict(&res);
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if (err)
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goto exit_device_put;
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err = platform_device_add_resources(sch56xx_pdev, &res, 1);
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if (err) {
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pr_err("Device resource addition failed\n");
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goto exit_device_put;
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}
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err = platform_device_add(sch56xx_pdev);
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if (err) {
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pr_err("Device addition failed\n");
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goto exit_device_put;
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}
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return 0;
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exit_device_put:
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platform_device_put(sch56xx_pdev);
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return err;
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}
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static int __init sch56xx_init(void)
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{
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int err;
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unsigned short address;
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const char *name;
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err = sch56xx_find(0x4e, &address, &name);
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if (err)
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err = sch56xx_find(0x2e, &address, &name);
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if (err)
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return err;
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return sch56xx_device_add(address, name);
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}
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static void __exit sch56xx_exit(void)
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{
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platform_device_unregister(sch56xx_pdev);
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}
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MODULE_DESCRIPTION("SMSC SCH56xx Hardware Monitoring Common Code");
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_LICENSE("GPL");
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module_init(sch56xx_init);
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module_exit(sch56xx_exit);
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