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linux/drivers/ata/pata_ali.c
Tejun Heo 2eab80ac0c [PATCH] libata: kill unnecessary sht->max_sectors initializations 
sht->max_sectors is overrided unconditionally in ->slave_configure.
There's no reason to set it to any value.

Signed-off-by: Tejun Heo <htejun@gmail.com>
2006-12-03 17:56:22 +09:00

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/*
* pata_ali.c - ALI 15x3 PATA for new ATA layer
* (C) 2005 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* based in part upon
* linux/drivers/ide/pci/alim15x3.c Version 0.17 2003/01/02
*
* Copyright (C) 1998-2000 Michel Aubry, Maintainer
* Copyright (C) 1998-2000 Andrzej Krzysztofowicz, Maintainer
* Copyright (C) 1999-2000 CJ, cjtsai@ali.com.tw, Maintainer
*
* Copyright (C) 1998-2000 Andre Hedrick (andre@linux-ide.org)
* May be copied or modified under the terms of the GNU General Public License
* Copyright (C) 2002 Alan Cox <alan@redhat.com>
* ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
*
* Documentation
* Chipset documentation available under NDA only
*
* TODO/CHECK
* Cannot have ATAPI on both master & slave for rev < c2 (???) but
* otherwise should do atapi DMA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/dmi.h>
#define DRV_NAME "pata_ali"
#define DRV_VERSION "0.7.1"
/*
* Cable special cases
*/
static struct dmi_system_id cable_dmi_table[] = {
{
.ident = "HP Pavilion N5430",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_BOARD_NAME, "OmniBook N32N-736"),
},
},
{ }
};
static int ali_cable_override(struct pci_dev *pdev)
{
/* Fujitsu P2000 */
if (pdev->subsystem_vendor == 0x10CF && pdev->subsystem_device == 0x10AF)
return 1;
/* Systems by DMI */
if (dmi_check_system(cable_dmi_table))
return 1;
return 0;
}
/**
* ali_c2_cable_detect - cable detection
* @ap: ATA port
*
* Perform cable detection for C2 and later revisions
*/
static int ali_c2_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 ata66;
/* Certain laptops use short but suitable cables and don't
implement the detect logic */
if (ali_cable_override(pdev))
return ATA_CBL_PATA40_SHORT;
/* Host view cable detect 0x4A bit 0 primary bit 1 secondary
Bit set for 40 pin */
pci_read_config_byte(pdev, 0x4A, &ata66);
if (ata66 & (1 << ap->port_no))
return ATA_CBL_PATA40;
else
return ATA_CBL_PATA80;
}
/**
* ali_early_error_handler - reset for eary chip
* @ap: ATA port
*
* Handle the reset callback for the later chips with cable detect
*/
static int ali_c2_pre_reset(struct ata_port *ap)
{
ap->cbl = ali_c2_cable_detect(ap);
return ata_std_prereset(ap);
}
static void ali_c2_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, ali_c2_pre_reset,
ata_std_softreset, NULL,
ata_std_postreset);
}
/**
* ali_early_cable_detect - cable detection
* @ap: ATA port
*
* Perform cable detection for older chipsets. This turns out to be
* rather easy to implement
*/
static int ali_early_cable_detect(struct ata_port *ap)
{
return ATA_CBL_PATA40;
}
/**
* ali_early_probe_init - reset for early chip
* @ap: ATA port
*
* Handle the reset callback for the early (pre cable detect) chips.
*/
static int ali_early_pre_reset(struct ata_port *ap)
{
ap->cbl = ali_early_cable_detect(ap);
return ata_std_prereset(ap);
}
static void ali_early_error_handler(struct ata_port *ap)
{
return ata_bmdma_drive_eh(ap, ali_early_pre_reset,
ata_std_softreset, NULL,
ata_std_postreset);
}
/**
* ali_20_filter - filter for earlier ALI DMA
* @ap: ALi ATA port
* @adev: attached device
*
* Ensure that we do not do DMA on CD devices. We may be able to
* fix that later on. Also ensure we do not do UDMA on WDC drives
*/
static unsigned long ali_20_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long mask)
{
char model_num[40];
/* No DMA on anything but a disk for now */
if (adev->class != ATA_DEV_ATA)
mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
ata_id_string(adev->id, model_num, ATA_ID_PROD_OFS, sizeof(model_num));
if (strstr(model_num, "WDC"))
return mask &= ~ATA_MASK_UDMA;
return ata_pci_default_filter(ap, adev, mask);
}
/**
* ali_fifo_control - FIFO manager
* @ap: ALi channel to control
* @adev: device for FIFO control
* @on: 0 for off 1 for on
*
* Enable or disable the FIFO on a given device. Because of the way the
* ALi FIFO works it provides a boost on ATA disk but can be confused by
* ATAPI and we must therefore manage it.
*/
static void ali_fifo_control(struct ata_port *ap, struct ata_device *adev, int on)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int pio_fifo = 0x54 + ap->port_no;
u8 fifo;
int shift = 4 * adev->devno;
/* ATA - FIFO on set nibble to 0x05, ATAPI - FIFO off, set nibble to
0x00. Not all the docs agree but the behaviour we now use is the
one stated in the BIOS Programming Guide */
pci_read_config_byte(pdev, pio_fifo, &fifo);
fifo &= ~(0x0F << shift);
if (on)
fifo |= (on << shift);
pci_write_config_byte(pdev, pio_fifo, fifo);
}
/**
* ali_program_modes - load mode registers
* @ap: ALi channel to load
* @adev: Device the timing is for
* @cmd: Command timing
* @data: Data timing
* @ultra: UDMA timing or zero for off
*
* Loads the timing registers for cmd/data and disable UDMA if
* ultra is zero. If ultra is set then load and enable the UDMA
* timing but do not touch the command/data timing.
*/
static void ali_program_modes(struct ata_port *ap, struct ata_device *adev, struct ata_timing *t, u8 ultra)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int cas = 0x58 + 4 * ap->port_no; /* Command timing */
int cbt = 0x59 + 4 * ap->port_no; /* Command timing */
int drwt = 0x5A + 4 * ap->port_no + adev->devno; /* R/W timing */
int udmat = 0x56 + ap->port_no; /* UDMA timing */
int shift = 4 * adev->devno;
u8 udma;
if (t != NULL) {
t->setup = FIT(t->setup, 1, 8) & 7;
t->act8b = FIT(t->act8b, 1, 8) & 7;
t->rec8b = FIT(t->rec8b, 1, 16) & 15;
t->active = FIT(t->active, 1, 8) & 7;
t->recover = FIT(t->recover, 1, 16) & 15;
pci_write_config_byte(pdev, cas, t->setup);
pci_write_config_byte(pdev, cbt, (t->act8b << 4) | t->rec8b);
pci_write_config_byte(pdev, drwt, (t->active << 4) | t->recover);
}
/* Set up the UDMA enable */
pci_read_config_byte(pdev, udmat, &udma);
udma &= ~(0x0F << shift);
udma |= ultra << shift;
pci_write_config_byte(pdev, udmat, udma);
}
/**
* ali_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Program the ALi registers for PIO mode. FIXME: add timings for
* PIO5.
*/
static void ali_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ata_device *pair = ata_dev_pair(adev);
struct ata_timing t;
unsigned long T = 1000000000 / 33333; /* PCI clock based */
ata_timing_compute(adev, adev->pio_mode, &t, T, 1);
if (pair) {
struct ata_timing p;
ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
if (pair->dma_mode) {
ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
}
}
/* PIO FIFO is only permitted on ATA disk */
if (adev->class != ATA_DEV_ATA)
ali_fifo_control(ap, adev, 0x00);
ali_program_modes(ap, adev, &t, 0);
if (adev->class == ATA_DEV_ATA)
ali_fifo_control(ap, adev, 0x05);
}
/**
* ali_set_dmamode - set initial DMA mode data
* @ap: ATA interface
* @adev: ATA device
*
* FIXME: MWDMA timings
*/
static void ali_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static u8 udma_timing[7] = { 0xC, 0xB, 0xA, 0x9, 0x8, 0xF, 0xD };
struct ata_device *pair = ata_dev_pair(adev);
struct ata_timing t;
unsigned long T = 1000000000 / 33333; /* PCI clock based */
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (adev->class == ATA_DEV_ATA)
ali_fifo_control(ap, adev, 0x08);
if (adev->dma_mode >= XFER_UDMA_0) {
ali_program_modes(ap, adev, NULL, udma_timing[adev->dma_mode - XFER_UDMA_0]);
if (adev->dma_mode >= XFER_UDMA_3) {
u8 reg4b;
pci_read_config_byte(pdev, 0x4B, &reg4b);
reg4b |= 1;
pci_write_config_byte(pdev, 0x4B, reg4b);
}
} else {
ata_timing_compute(adev, adev->dma_mode, &t, T, 1);
if (pair) {
struct ata_timing p;
ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
if (pair->dma_mode) {
ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
}
}
ali_program_modes(ap, adev, &t, 0);
}
}
/**
* ali_lock_sectors - Keep older devices to 255 sector mode
* @ap: ATA port
* @adev: Device
*
* Called during the bus probe for each device that is found. We use
* this call to lock the sector count of the device to 255 or less on
* older ALi controllers. If we didn't do this then large I/O's would
* require LBA48 commands which the older ALi requires are issued by
* slower PIO methods
*/
static void ali_lock_sectors(struct ata_port *ap, struct ata_device *adev)
{
adev->max_sectors = 255;
}
static struct scsi_host_template ali_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
.resume = ata_scsi_device_resume,
.suspend = ata_scsi_device_suspend,
};
/*
* Port operations for PIO only ALi
*/
static struct ata_port_operations ali_early_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = ali_set_piomode,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ali_early_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_pio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
/*
* Port operations for DMA capable ALi without cable
* detect
*/
static struct ata_port_operations ali_20_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = ali_set_piomode,
.set_dmamode = ali_set_dmamode,
.mode_filter = ali_20_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.dev_config = ali_lock_sectors,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ali_early_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_pio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
/*
* Port operations for DMA capable ALi with cable detect
*/
static struct ata_port_operations ali_c2_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = ali_set_piomode,
.set_dmamode = ali_set_dmamode,
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.dev_config = ali_lock_sectors,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ali_c2_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_pio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
/*
* Port operations for DMA capable ALi with cable detect and LBA48
*/
static struct ata_port_operations ali_c5_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = ali_set_piomode,
.set_dmamode = ali_set_dmamode,
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ali_c2_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_pio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
/**
* ali_init_chipset - chip setup function
* @pdev: PCI device of ATA controller
*
* Perform the setup on the device that must be done both at boot
* and at resume time.
*/
static void ali_init_chipset(struct pci_dev *pdev)
{
u8 rev, tmp;
struct pci_dev *north, *isa_bridge;
pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
/*
* The chipset revision selects the driver operations and
* mode data.
*/
if (rev >= 0x20 && rev < 0xC2) {
/* 1543-E/F, 1543C-C, 1543C-D, 1543C-E */
pci_read_config_byte(pdev, 0x4B, &tmp);
/* Clear CD-ROM DMA write bit */
tmp &= 0x7F;
pci_write_config_byte(pdev, 0x4B, tmp);
} else if (rev >= 0xC2) {
/* Enable cable detection logic */
pci_read_config_byte(pdev, 0x4B, &tmp);
pci_write_config_byte(pdev, 0x4B, tmp | 0x08);
}
north = pci_get_slot(pdev->bus, PCI_DEVFN(0,0));
isa_bridge = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
if (north && north->vendor == PCI_VENDOR_ID_AL && isa_bridge) {
/* Configure the ALi bridge logic. For non ALi rely on BIOS.
Set the south bridge enable bit */
pci_read_config_byte(isa_bridge, 0x79, &tmp);
if (rev == 0xC2)
pci_write_config_byte(isa_bridge, 0x79, tmp | 0x04);
else if (rev > 0xC2)
pci_write_config_byte(isa_bridge, 0x79, tmp | 0x02);
}
if (rev >= 0x20) {
/*
* CD_ROM DMA on (0x53 bit 0). Enable this even if we want
* to use PIO. 0x53 bit 1 (rev 20 only) - enable FIFO control
* via 0x54/55.
*/
pci_read_config_byte(pdev, 0x53, &tmp);
if (rev <= 0x20)
tmp &= ~0x02;
if (rev >= 0xc7)
tmp |= 0x03;
else
tmp |= 0x01; /* CD_ROM enable for DMA */
pci_write_config_byte(pdev, 0x53, tmp);
}
pci_dev_put(isa_bridge);
pci_dev_put(north);
ata_pci_clear_simplex(pdev);
}
/**
* ali_init_one - discovery callback
* @pdev: PCI device ID
* @id: PCI table info
*
* An ALi IDE interface has been discovered. Figure out what revision
* and perform configuration work before handing it to the ATA layer
*/
static int ali_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
static struct ata_port_info info_early = {
.sht = &ali_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.port_ops = &ali_early_port_ops
};
/* Revision 0x20 added DMA */
static struct ata_port_info info_20 = {
.sht = &ali_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.port_ops = &ali_20_port_ops
};
/* Revision 0x20 with support logic added UDMA */
static struct ata_port_info info_20_udma = {
.sht = &ali_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x07, /* UDMA33 */
.port_ops = &ali_20_port_ops
};
/* Revision 0xC2 adds UDMA66 */
static struct ata_port_info info_c2 = {
.sht = &ali_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x1f,
.port_ops = &ali_c2_port_ops
};
/* Revision 0xC3 is UDMA100 */
static struct ata_port_info info_c3 = {
.sht = &ali_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x3f,
.port_ops = &ali_c2_port_ops
};
/* Revision 0xC4 is UDMA133 */
static struct ata_port_info info_c4 = {
.sht = &ali_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x7f,
.port_ops = &ali_c2_port_ops
};
/* Revision 0xC5 is UDMA133 with LBA48 DMA */
static struct ata_port_info info_c5 = {
.sht = &ali_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x7f,
.port_ops = &ali_c5_port_ops
};
static struct ata_port_info *port_info[2];
u8 rev, tmp;
struct pci_dev *isa_bridge;
pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
/*
* The chipset revision selects the driver operations and
* mode data.
*/
if (rev < 0x20) {
port_info[0] = port_info[1] = &info_early;
} else if (rev < 0xC2) {
port_info[0] = port_info[1] = &info_20;
} else if (rev == 0xC2) {
port_info[0] = port_info[1] = &info_c2;
} else if (rev == 0xC3) {
port_info[0] = port_info[1] = &info_c3;
} else if (rev == 0xC4) {
port_info[0] = port_info[1] = &info_c4;
} else
port_info[0] = port_info[1] = &info_c5;
ali_init_chipset(pdev);
isa_bridge = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
if (isa_bridge && rev >= 0x20 && rev < 0xC2) {
/* Are we paired with a UDMA capable chip */
pci_read_config_byte(isa_bridge, 0x5E, &tmp);
if ((tmp & 0x1E) == 0x12)
port_info[0] = port_info[1] = &info_20_udma;
pci_dev_put(isa_bridge);
}
return ata_pci_init_one(pdev, port_info, 2);
}
static int ali_reinit_one(struct pci_dev *pdev)
{
ali_init_chipset(pdev);
return ata_pci_device_resume(pdev);
}
static const struct pci_device_id ali[] = {
{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5228), },
{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5229), },
{ },
};
static struct pci_driver ali_pci_driver = {
.name = DRV_NAME,
.id_table = ali,
.probe = ali_init_one,
.remove = ata_pci_remove_one,
.suspend = ata_pci_device_suspend,
.resume = ali_reinit_one,
};
static int __init ali_init(void)
{
return pci_register_driver(&ali_pci_driver);
}
static void __exit ali_exit(void)
{
pci_unregister_driver(&ali_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ALi PATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ali);
MODULE_VERSION(DRV_VERSION);
module_init(ali_init);
module_exit(ali_exit);
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