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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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839e7306e5
Don't powerdown Compaq Triflex IDE device on suspend
This fixes APM suspend on Compaq Armada 7400.
APM BIOS doesn't suspend if IDE is powered down when suspending.
The Triflex controller is found only on old Compaq boards,
so this patch will hopefully have no side effects.
This patch fixes a suspend regression introduced in
feb22b7f8e ("ide: add proper PCI PM
support (v2)").
Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
[bart: add commit's summary in parens]
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
157 lines
3.8 KiB
C
157 lines
3.8 KiB
C
/*
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* IDE Chipset driver for the Compaq TriFlex IDE controller.
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*
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* Known to work with the Compaq Workstation 5x00 series.
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*
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* Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
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* Author: Torben Mathiasen <torben.mathiasen@hp.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 version 2 as
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* published by the Free Software Foundation.
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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 Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Loosely based on the piix & svwks drivers.
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*
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* Documentation:
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* Not publicly available.
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/ide.h>
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#include <linux/init.h>
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#define DRV_NAME "triflex"
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static void triflex_set_mode(ide_hwif_t *hwif, ide_drive_t *drive)
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{
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struct pci_dev *dev = to_pci_dev(hwif->dev);
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u32 triflex_timings = 0;
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u16 timing = 0;
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u8 channel_offset = hwif->channel ? 0x74 : 0x70, unit = drive->dn & 1;
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pci_read_config_dword(dev, channel_offset, &triflex_timings);
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switch (drive->dma_mode) {
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case XFER_MW_DMA_2:
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timing = 0x0103;
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break;
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case XFER_MW_DMA_1:
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timing = 0x0203;
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break;
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case XFER_MW_DMA_0:
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timing = 0x0808;
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break;
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case XFER_SW_DMA_2:
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case XFER_SW_DMA_1:
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case XFER_SW_DMA_0:
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timing = 0x0f0f;
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break;
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case XFER_PIO_4:
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timing = 0x0202;
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break;
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case XFER_PIO_3:
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timing = 0x0204;
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break;
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case XFER_PIO_2:
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timing = 0x0404;
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break;
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case XFER_PIO_1:
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timing = 0x0508;
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break;
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case XFER_PIO_0:
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timing = 0x0808;
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break;
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}
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triflex_timings &= ~(0xFFFF << (16 * unit));
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triflex_timings |= (timing << (16 * unit));
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pci_write_config_dword(dev, channel_offset, triflex_timings);
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}
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static void triflex_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
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{
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drive->dma_mode = drive->pio_mode;
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triflex_set_mode(hwif, drive);
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}
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static const struct ide_port_ops triflex_port_ops = {
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.set_pio_mode = triflex_set_pio_mode,
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.set_dma_mode = triflex_set_mode,
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};
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static const struct ide_port_info triflex_device __devinitdata = {
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.name = DRV_NAME,
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.enablebits = {{0x80, 0x01, 0x01}, {0x80, 0x02, 0x02}},
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.port_ops = &triflex_port_ops,
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.pio_mask = ATA_PIO4,
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.swdma_mask = ATA_SWDMA2,
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.mwdma_mask = ATA_MWDMA2,
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};
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static int __devinit triflex_init_one(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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return ide_pci_init_one(dev, &triflex_device, NULL);
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}
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static const struct pci_device_id triflex_pci_tbl[] = {
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{ PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), 0 },
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{ 0, },
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};
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MODULE_DEVICE_TABLE(pci, triflex_pci_tbl);
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#ifdef CONFIG_PM
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static int triflex_ide_pci_suspend(struct pci_dev *dev, pm_message_t state)
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{
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/*
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* We must not disable or powerdown the device.
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* APM bios refuses to suspend if IDE is not accessible.
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*/
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pci_save_state(dev);
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return 0;
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}
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#else
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#define triflex_ide_pci_suspend NULL
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#endif
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static struct pci_driver triflex_pci_driver = {
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.name = "TRIFLEX_IDE",
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.id_table = triflex_pci_tbl,
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.probe = triflex_init_one,
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.remove = ide_pci_remove,
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.suspend = triflex_ide_pci_suspend,
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.resume = ide_pci_resume,
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};
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static int __init triflex_ide_init(void)
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{
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return ide_pci_register_driver(&triflex_pci_driver);
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}
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static void __exit triflex_ide_exit(void)
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{
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pci_unregister_driver(&triflex_pci_driver);
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}
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module_init(triflex_ide_init);
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module_exit(triflex_ide_exit);
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MODULE_AUTHOR("Torben Mathiasen");
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MODULE_DESCRIPTION("PCI driver module for Compaq Triflex IDE");
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MODULE_LICENSE("GPL");
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