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linux-next/drivers/ata/pata_atiixp.c
Darren Stevens e47ecd4e48 libata:pata_atiixp: Don't use unconnected secondary port on SB600 
The AMD SB600 southbridge has an PATA IDE interface, but the
    secondary port has no physical connections, so is disabled in
    the PCI header which makes it appear as a legacy port.

    On most systems this causes no trouble, but the Amigaone X1000 has
    an SB600 connected to a PowerPC SoC PCI-e root port, with an
    emulated ISA bus. On this system a kernel panic occurs at boot
    time during device attach for the secondary port.

    Mark the port as 'dummy' to prevent this. As a bonus, disabling
    this will slightly speed up booting on PC systems using an
    SB600 as they will now skip 2 known empty ports.

    Signed-off-by: Darren Stevens <Darren@stevens-zone.net>

Signed-off-by: Tejun Heo <tj@kernel.org>
2018-01-08 04:02:02 -08:00

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/*
* pata_atiixp.c - ATI PATA for new ATA layer
* (C) 2005 Red Hat Inc
* (C) 2009-2010 Bartlomiej Zolnierkiewicz
*
* Based on
*
* linux/drivers/ide/pci/atiixp.c Version 0.01-bart2 Feb. 26, 2004
*
* Copyright (C) 2003 ATI Inc. <hyu@ati.com>
* Copyright (C) 2004 Bartlomiej Zolnierkiewicz
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.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_atiixp"
#define DRV_VERSION "0.4.6"
enum {
ATIIXP_IDE_PIO_TIMING = 0x40,
ATIIXP_IDE_MWDMA_TIMING = 0x44,
ATIIXP_IDE_PIO_CONTROL = 0x48,
ATIIXP_IDE_PIO_MODE = 0x4a,
ATIIXP_IDE_UDMA_CONTROL = 0x54,
ATIIXP_IDE_UDMA_MODE = 0x56
};
static const struct dmi_system_id attixp_cable_override_dmi_table[] = {
{
/* Board has onboard PATA<->SATA converters */
.ident = "MSI E350DM-E33",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "MSI"),
DMI_MATCH(DMI_BOARD_NAME, "E350DM-E33(MS-7720)"),
},
},
{ }
};
static int atiixp_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 udma;
if (dmi_check_system(attixp_cable_override_dmi_table))
return ATA_CBL_PATA40_SHORT;
/* Hack from drivers/ide/pci. Really we want to know how to do the
raw detection not play follow the bios mode guess */
pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
return ATA_CBL_PATA80;
return ATA_CBL_PATA40;
}
static DEFINE_SPINLOCK(atiixp_lock);
/**
* atiixp_prereset - perform reset handling
* @link: ATA link
* @deadline: deadline jiffies for the operation
*
* Reset sequence checking enable bits to see which ports are
* active.
*/
static int atiixp_prereset(struct ata_link *link, unsigned long deadline)
{
static const struct pci_bits atiixp_enable_bits[] = {
{ 0x48, 1, 0x01, 0x00 },
{ 0x48, 1, 0x08, 0x00 }
};
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
/**
* atiixp_set_pio_timing - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called by both the pio and dma setup functions to set the controller
* timings for PIO transfers. We must load both the mode number and
* timing values into the controller.
*/
static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, int pio)
{
static u8 pio_timings[5] = { 0x5D, 0x47, 0x34, 0x22, 0x20 };
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = 2 * ap->port_no + adev->devno;
int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
u32 pio_timing_data;
u16 pio_mode_data;
pci_read_config_word(pdev, ATIIXP_IDE_PIO_MODE, &pio_mode_data);
pio_mode_data &= ~(0x7 << (4 * dn));
pio_mode_data |= pio << (4 * dn);
pci_write_config_word(pdev, ATIIXP_IDE_PIO_MODE, pio_mode_data);
pci_read_config_dword(pdev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
pio_timing_data &= ~(0xFF << timing_shift);
pio_timing_data |= (pio_timings[pio] << timing_shift);
pci_write_config_dword(pdev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
}
/**
* atiixp_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the PIO mode setup. We use a shared helper for this
* as the DMA setup must also adjust the PIO timing information.
*/
static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
unsigned long flags;
spin_lock_irqsave(&atiixp_lock, flags);
atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0);
spin_unlock_irqrestore(&atiixp_lock, flags);
}
/**
* atiixp_set_dmamode - set initial DMA mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the DMA mode setup. We use timing tables for most
* modes but must tune an appropriate PIO mode to match.
*/
static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static u8 mwdma_timings[5] = { 0x77, 0x21, 0x20 };
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dma = adev->dma_mode;
int dn = 2 * ap->port_no + adev->devno;
int wanted_pio;
unsigned long flags;
spin_lock_irqsave(&atiixp_lock, flags);
if (adev->dma_mode >= XFER_UDMA_0) {
u16 udma_mode_data;
dma -= XFER_UDMA_0;
pci_read_config_word(pdev, ATIIXP_IDE_UDMA_MODE, &udma_mode_data);
udma_mode_data &= ~(0x7 << (4 * dn));
udma_mode_data |= dma << (4 * dn);
pci_write_config_word(pdev, ATIIXP_IDE_UDMA_MODE, udma_mode_data);
} else {
int timing_shift = (16 * ap->port_no) + 8 * (adev->devno ^ 1);
u32 mwdma_timing_data;
dma -= XFER_MW_DMA_0;
pci_read_config_dword(pdev, ATIIXP_IDE_MWDMA_TIMING,
&mwdma_timing_data);
mwdma_timing_data &= ~(0xFF << timing_shift);
mwdma_timing_data |= (mwdma_timings[dma] << timing_shift);
pci_write_config_dword(pdev, ATIIXP_IDE_MWDMA_TIMING,
mwdma_timing_data);
}
/*
* We must now look at the PIO mode situation. We may need to
* adjust the PIO mode to keep the timings acceptable
*/
if (adev->dma_mode >= XFER_MW_DMA_2)
wanted_pio = 4;
else if (adev->dma_mode == XFER_MW_DMA_1)
wanted_pio = 3;
else if (adev->dma_mode == XFER_MW_DMA_0)
wanted_pio = 0;
else BUG();
if (adev->pio_mode != wanted_pio)
atiixp_set_pio_timing(ap, adev, wanted_pio);
spin_unlock_irqrestore(&atiixp_lock, flags);
}
/**
* atiixp_bmdma_start - DMA start callback
* @qc: Command in progress
*
* When DMA begins we need to ensure that the UDMA control
* register for the channel is correctly set.
*
* Note: The host lock held by the libata layer protects
* us from two channels both trying to set DMA bits at once
*/
static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = (2 * ap->port_no) + adev->devno;
u16 tmp16;
pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
if (ata_using_udma(adev))
tmp16 |= (1 << dn);
else
tmp16 &= ~(1 << dn);
pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
ata_bmdma_start(qc);
}
/**
* atiixp_dma_stop - DMA stop callback
* @qc: Command in progress
*
* DMA has completed. Clear the UDMA flag as the next operations will
* be PIO ones not UDMA data transfer.
*
* Note: The host lock held by the libata layer protects
* us from two channels both trying to set DMA bits at once
*/
static void atiixp_bmdma_stop(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int dn = (2 * ap->port_no) + qc->dev->devno;
u16 tmp16;
pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
tmp16 &= ~(1 << dn);
pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16);
ata_bmdma_stop(qc);
}
static struct scsi_host_template atiixp_sht = {
ATA_BMDMA_SHT(DRV_NAME),
.sg_tablesize = LIBATA_DUMB_MAX_PRD,
};
static struct ata_port_operations atiixp_port_ops = {
.inherits = &ata_bmdma_port_ops,
.qc_prep = ata_bmdma_dumb_qc_prep,
.bmdma_start = atiixp_bmdma_start,
.bmdma_stop = atiixp_bmdma_stop,
.prereset = atiixp_prereset,
.cable_detect = atiixp_cable_detect,
.set_piomode = atiixp_set_piomode,
.set_dmamode = atiixp_set_dmamode,
};
static int atiixp_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA12_ONLY,
.udma_mask = ATA_UDMA5,
.port_ops = &atiixp_port_ops
};
const struct ata_port_info *ppi[] = { &info, &info };
/* SB600 doesn't have secondary port wired */
if((pdev->device == PCI_DEVICE_ID_ATI_IXP600_IDE))
ppi[1] = &ata_dummy_port_info;
return ata_pci_bmdma_init_one(pdev, ppi, &atiixp_sht, NULL,
ATA_HOST_PARALLEL_SCAN);
}
static const struct pci_device_id atiixp[] = {
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP200_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP300_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP400_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP600_IDE), },
{ PCI_VDEVICE(ATI, PCI_DEVICE_ID_ATI_IXP700_IDE), },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_HUDSON2_IDE), },
{ },
};
static struct pci_driver atiixp_pci_driver = {
.name = DRV_NAME,
.id_table = atiixp,
.probe = atiixp_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM_SLEEP
.resume = ata_pci_device_resume,
.suspend = ata_pci_device_suspend,
#endif
};
module_pci_driver(atiixp_pci_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ATI IXP200/300/400");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, atiixp);
MODULE_VERSION(DRV_VERSION);
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