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linux-stable/drivers/ide/pci/cs5535.c
Bartlomiej Zolnierkiewicz 2d5eaa6dd7 ide: rework the code for selecting the best DMA transfer mode (v3) 
Depends on the "ide: fix UDMA/MWDMA/SWDMA masks" patch.

* add ide_hwif_t.udma_filter hook for filtering UDMA mask
  (use it in alim15x3, hpt366, siimage and serverworks drivers)
* add ide_max_dma_mode() for finding best DMA mode for the device
  (loosely based on some older libata-core.c code)
* convert ide_dma_speed() users to use ide_max_dma_mode()
* make ide_rate_filter() take "ide_drive_t *drive" as an argument instead
  of "u8 mode" and teach it to how to use UDMA mask to do filtering
* use ide_rate_filter() in hpt366 driver
* remove no longer needed ide_dma_speed() and *_ratemask()
* unexport eighty_ninty_three()

v2:
* rename ->filter_udma_mask to ->udma_filter
  [ Suggested by Sergei Shtylyov <sshtylyov@ru.mvista.com>. ]

v3:
* updated for scc_pata driver (fixes XFER_UDMA_6 filtering for user-space
  originated transfer mode change requests when 100MHz clock is used)

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2007-05-10 00:01:08 +02:00

279 lines
7.5 KiB
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/*
* linux/drivers/ide/pci/cs5535.c
*
* Copyright (C) 2004-2005 Advanced Micro Devices, Inc.
*
* History:
* 09/20/2005 - Jaya Kumar <jayakumar.ide@gmail.com>
* - Reworked tuneproc, set_drive, misc mods to prep for mainline
* - Work was sponsored by CIS (M) Sdn Bhd.
* Ported to Kernel 2.6.11 on June 26, 2005 by
* Wolfgang Zuleger <wolfgang.zuleger@gmx.de>
* Alexander Kiausch <alex.kiausch@t-online.de>
* Originally developed by AMD for 2.4/2.6
*
* Development of this chipset driver was funded
* by the nice folks at National Semiconductor/AMD.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* Documentation:
* CS5535 documentation available from AMD
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include "ide-timing.h"
#define MSR_ATAC_BASE 0x51300000
#define ATAC_GLD_MSR_CAP (MSR_ATAC_BASE+0)
#define ATAC_GLD_MSR_CONFIG (MSR_ATAC_BASE+0x01)
#define ATAC_GLD_MSR_SMI (MSR_ATAC_BASE+0x02)
#define ATAC_GLD_MSR_ERROR (MSR_ATAC_BASE+0x03)
#define ATAC_GLD_MSR_PM (MSR_ATAC_BASE+0x04)
#define ATAC_GLD_MSR_DIAG (MSR_ATAC_BASE+0x05)
#define ATAC_IO_BAR (MSR_ATAC_BASE+0x08)
#define ATAC_RESET (MSR_ATAC_BASE+0x10)
#define ATAC_CH0D0_PIO (MSR_ATAC_BASE+0x20)
#define ATAC_CH0D0_DMA (MSR_ATAC_BASE+0x21)
#define ATAC_CH0D1_PIO (MSR_ATAC_BASE+0x22)
#define ATAC_CH0D1_DMA (MSR_ATAC_BASE+0x23)
#define ATAC_PCI_ABRTERR (MSR_ATAC_BASE+0x24)
#define ATAC_BM0_CMD_PRIM 0x00
#define ATAC_BM0_STS_PRIM 0x02
#define ATAC_BM0_PRD 0x04
#define CS5535_CABLE_DETECT 0x48
/* Format I PIO settings. We seperate out cmd and data for safer timings */
static unsigned int cs5535_pio_cmd_timings[5] =
{ 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131 };
static unsigned int cs5535_pio_dta_timings[5] =
{ 0xF7F4, 0xF173, 0x8141, 0x5131, 0x1131 };
static unsigned int cs5535_mwdma_timings[3] =
{ 0x7F0FFFF3, 0x7F035352, 0x7f024241 };
static unsigned int cs5535_udma_timings[5] =
{ 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061 };
/* Macros to check if the register is the reset value - reset value is an
invalid timing and indicates the register has not been set previously */
#define CS5535_BAD_PIO(timings) ( (timings&~0x80000000UL) == 0x00009172 )
#define CS5535_BAD_DMA(timings) ( (timings & 0x000FFFFF) == 0x00077771 )
/****
* cs5535_set_speed - Configure the chipset to the new speed
* @drive: Drive to set up
* @speed: desired speed
*
* cs5535_set_speed() configures the chipset to a new speed.
*/
static void cs5535_set_speed(ide_drive_t *drive, u8 speed)
{
u32 reg = 0, dummy;
int unit = drive->select.b.unit;
/* Set the PIO timings */
if ((speed & XFER_MODE) == XFER_PIO) {
u8 pioa;
u8 piob;
u8 cmd;
pioa = speed - XFER_PIO_0;
piob = ide_get_best_pio_mode(&(drive->hwif->drives[!unit]),
255, 4, NULL);
cmd = pioa < piob ? pioa : piob;
/* Write the speed of the current drive */
reg = (cs5535_pio_cmd_timings[cmd] << 16) |
cs5535_pio_dta_timings[pioa];
wrmsr(unit ? ATAC_CH0D1_PIO : ATAC_CH0D0_PIO, reg, 0);
/* And if nessesary - change the speed of the other drive */
rdmsr(unit ? ATAC_CH0D0_PIO : ATAC_CH0D1_PIO, reg, dummy);
if (((reg >> 16) & cs5535_pio_cmd_timings[cmd]) !=
cs5535_pio_cmd_timings[cmd]) {
reg &= 0x0000FFFF;
reg |= cs5535_pio_cmd_timings[cmd] << 16;
wrmsr(unit ? ATAC_CH0D0_PIO : ATAC_CH0D1_PIO, reg, 0);
}
/* Set bit 31 of the DMA register for PIO format 1 timings */
rdmsr(unit ? ATAC_CH0D1_DMA : ATAC_CH0D0_DMA, reg, dummy);
wrmsr(unit ? ATAC_CH0D1_DMA : ATAC_CH0D0_DMA,
reg | 0x80000000UL, 0);
} else {
rdmsr(unit ? ATAC_CH0D1_DMA : ATAC_CH0D0_DMA, reg, dummy);
reg &= 0x80000000UL; /* Preserve the PIO format bit */
if (speed >= XFER_UDMA_0 && speed <= XFER_UDMA_7)
reg |= cs5535_udma_timings[speed - XFER_UDMA_0];
else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
reg |= cs5535_mwdma_timings[speed - XFER_MW_DMA_0];
else
return;
wrmsr(unit ? ATAC_CH0D1_DMA : ATAC_CH0D0_DMA, reg, 0);
}
}
/****
* cs5535_set_drive - Configure the drive to the new speed
* @drive: Drive to set up
* @speed: desired speed
*
* cs5535_set_drive() configures the drive and the chipset to a
* new speed. It also can be called by upper layers.
*/
static int cs5535_set_drive(ide_drive_t *drive, u8 speed)
{
speed = ide_rate_filter(drive, speed);
ide_config_drive_speed(drive, speed);
cs5535_set_speed(drive, speed);
return 0;
}
/****
* cs5535_tuneproc - PIO setup
* @drive: drive to set up
* @pio: mode to use (255 for 'best possible')
*
* A callback from the upper layers for PIO-only tuning.
*/
static void cs5535_tuneproc(ide_drive_t *drive, u8 xferspeed)
{
u8 modes[] = { XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3,
XFER_PIO_4 };
/* cs5535 max pio is pio 4, best_pio will check the blacklist.
i think we don't need to rate_filter the incoming xferspeed
since we know we're only going to choose pio */
xferspeed = ide_get_best_pio_mode(drive, xferspeed, 4, NULL);
ide_config_drive_speed(drive, modes[xferspeed]);
cs5535_set_speed(drive, xferspeed);
}
static int cs5535_config_drive_for_dma(ide_drive_t *drive)
{
u8 speed = ide_max_dma_mode(drive);
/* If no DMA speed was available then let dma_check hit pio */
if (!speed) {
return 0;
}
cs5535_set_drive(drive, speed);
return ide_dma_enable(drive);
}
static int cs5535_dma_check(ide_drive_t *drive)
{
u8 speed;
drive->init_speed = 0;
if (ide_use_dma(drive) && cs5535_config_drive_for_dma(drive))
return 0;
if (ide_use_fast_pio(drive)) {
speed = ide_get_best_pio_mode(drive, 255, 4, NULL);
cs5535_set_drive(drive, speed);
}
return -1;
}
static u8 __devinit cs5535_cable_detect(struct pci_dev *dev)
{
u8 bit;
/* if a 80 wire cable was detected */
pci_read_config_byte(dev, CS5535_CABLE_DETECT, &bit);
return (bit & 1);
}
/****
* init_hwif_cs5535 - Initialize one ide cannel
* @hwif: Channel descriptor
*
* This gets invoked by the IDE driver once for each channel. It
* performs channel-specific pre-initialization before drive probing.
*
*/
static void __devinit init_hwif_cs5535(ide_hwif_t *hwif)
{
int i;
hwif->autodma = 0;
hwif->tuneproc = &cs5535_tuneproc;
hwif->speedproc = &cs5535_set_drive;
hwif->ide_dma_check = &cs5535_dma_check;
hwif->atapi_dma = 1;
hwif->ultra_mask = 0x1F;
hwif->mwdma_mask = 0x07;
hwif->udma_four = cs5535_cable_detect(hwif->pci_dev);
if (!noautodma)
hwif->autodma = 1;
/* just setting autotune and not worrying about bios timings */
for (i = 0; i < 2; i++) {
hwif->drives[i].autotune = 1;
hwif->drives[i].autodma = hwif->autodma;
}
}
static ide_pci_device_t cs5535_chipset __devinitdata = {
.name = "CS5535",
.init_hwif = init_hwif_cs5535,
.channels = 1,
.autodma = AUTODMA,
.bootable = ON_BOARD,
};
static int __devinit cs5535_init_one(struct pci_dev *dev,
const struct pci_device_id *id)
{
return ide_setup_pci_device(dev, &cs5535_chipset);
}
static struct pci_device_id cs5535_pci_tbl[] =
{
{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_IDE, PCI_ANY_ID,
PCI_ANY_ID, 0, 0, 0},
{ 0, },
};
MODULE_DEVICE_TABLE(pci, cs5535_pci_tbl);
static struct pci_driver driver = {
.name = "CS5535_IDE",
.id_table = cs5535_pci_tbl,
.probe = cs5535_init_one,
};
static int __init cs5535_ide_init(void)
{
return ide_pci_register_driver(&driver);
}
module_init(cs5535_ide_init);
MODULE_AUTHOR("AMD");
MODULE_DESCRIPTION("PCI driver module for AMD/NS CS5535 IDE");
MODULE_LICENSE("GPL");
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