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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * pata_triflex.c - Compaq PATA for new ATA layer4 * (C) 2005 Red Hat Inc5 * Alan Cox <alan@lxorguk.ukuu.org.uk>6 *7 * based upon8 *9 * triflex.c10 *11 * IDE Chipset driver for the Compaq TriFlex IDE controller.12 *13 * Known to work with the Compaq Workstation 5x00 series.14 *15 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.16 * Author: Torben Mathiasen <torben.mathiasen@hp.com>17 *18 * Loosely based on the piix & svwks drivers.19 *20 * Documentation:21 * Not publicly available.22 */23 24#include <linux/kernel.h>25#include <linux/module.h>26#include <linux/pci.h>27#include <linux/blkdev.h>28#include <linux/delay.h>29#include <scsi/scsi_host.h>30#include <linux/libata.h>31 32#define DRV_NAME "pata_triflex"33#define DRV_VERSION "0.2.8"34 35/**36 * triflex_prereset - probe begin37 * @link: ATA link38 * @deadline: deadline jiffies for the operation39 *40 * Set up cable type and use generic probe init41 */42 43static int triflex_prereset(struct ata_link *link, unsigned long deadline)44{45 static const struct pci_bits triflex_enable_bits[] = {46 { 0x80, 1, 0x01, 0x01 },47 { 0x80, 1, 0x02, 0x02 }48 };49 50 struct ata_port *ap = link->ap;51 struct pci_dev *pdev = to_pci_dev(ap->host->dev);52 53 if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))54 return -ENOENT;55 56 return ata_sff_prereset(link, deadline);57}58 59 60 61/**62 * triflex_load_timing - timing configuration63 * @ap: ATA interface64 * @adev: Device on the bus65 * @speed: speed to configure66 *67 * The Triflex has one set of timings per device per channel. This68 * means we must do some switching. As the PIO and DMA timings don't69 * match we have to do some reloading unlike PIIX devices where tuning70 * tricks can avoid it.71 */72 73static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)74{75 struct pci_dev *pdev = to_pci_dev(ap->host->dev);76 u32 timing = 0;77 u32 triflex_timing, old_triflex_timing;78 int channel_offset = ap->port_no ? 0x74: 0x70;79 unsigned int is_slave = (adev->devno != 0);80 81 82 pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);83 triflex_timing = old_triflex_timing;84 85 switch(speed)86 {87 case XFER_MW_DMA_2:88 timing = 0x0103;break;89 case XFER_MW_DMA_1:90 timing = 0x0203;break;91 case XFER_MW_DMA_0:92 timing = 0x0808;break;93 case XFER_SW_DMA_2:94 case XFER_SW_DMA_1:95 case XFER_SW_DMA_0:96 timing = 0x0F0F;break;97 case XFER_PIO_4:98 timing = 0x0202;break;99 case XFER_PIO_3:100 timing = 0x0204;break;101 case XFER_PIO_2:102 timing = 0x0404;break;103 case XFER_PIO_1:104 timing = 0x0508;break;105 case XFER_PIO_0:106 timing = 0x0808;break;107 default:108 BUG();109 }110 triflex_timing &= ~ (0xFFFF << (16 * is_slave));111 triflex_timing |= (timing << (16 * is_slave));112 113 if (triflex_timing != old_triflex_timing)114 pci_write_config_dword(pdev, channel_offset, triflex_timing);115}116 117/**118 * triflex_set_piomode - set initial PIO mode data119 * @ap: ATA interface120 * @adev: ATA device121 *122 * Use the timing loader to set up the PIO mode. We have to do this123 * because DMA start/stop will only be called once DMA occurs. If there124 * has been no DMA then the PIO timings are still needed.125 */126static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)127{128 triflex_load_timing(ap, adev, adev->pio_mode);129}130 131/**132 * triflex_bmdma_start - DMA start callback133 * @qc: Command in progress134 *135 * Usually drivers set the DMA timing at the point the set_dmamode call136 * is made. Triflex however requires we load new timings on the137 * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).138 * We load the DMA timings just before starting DMA and then restore139 * the PIO timing when the DMA is finished.140 */141 142static void triflex_bmdma_start(struct ata_queued_cmd *qc)143{144 triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);145 ata_bmdma_start(qc);146}147 148/**149 * triflex_bmdma_stop - DMA stop callback150 * @qc: ATA command151 *152 * We loaded new timings in dma_start, as a result we need to restore153 * the PIO timings in dma_stop so that the next command issue gets the154 * right clock values.155 */156 157static void triflex_bmdma_stop(struct ata_queued_cmd *qc)158{159 ata_bmdma_stop(qc);160 triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);161}162 163static const struct scsi_host_template triflex_sht = {164 ATA_BMDMA_SHT(DRV_NAME),165};166 167static struct ata_port_operations triflex_port_ops = {168 .inherits = &ata_bmdma_port_ops,169 .bmdma_start = triflex_bmdma_start,170 .bmdma_stop = triflex_bmdma_stop,171 .cable_detect = ata_cable_40wire,172 .set_piomode = triflex_set_piomode,173 .prereset = triflex_prereset,174};175 176static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)177{178 static const struct ata_port_info info = {179 .flags = ATA_FLAG_SLAVE_POSS,180 .pio_mask = ATA_PIO4,181 .mwdma_mask = ATA_MWDMA2,182 .port_ops = &triflex_port_ops183 };184 const struct ata_port_info *ppi[] = { &info, NULL };185 186 ata_print_version_once(&dev->dev, DRV_VERSION);187 188 return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);189}190 191static const struct pci_device_id triflex[] = {192 { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },193 194 { },195};196 197#ifdef CONFIG_PM_SLEEP198static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)199{200 struct ata_host *host = pci_get_drvdata(pdev);201 202 ata_host_suspend(host, mesg);203 204 /*205 * We must not disable or powerdown the device.206 * APM bios refuses to suspend if IDE is not accessible.207 */208 pci_save_state(pdev);209 210 return 0;211}212 213#endif214 215static struct pci_driver triflex_pci_driver = {216 .name = DRV_NAME,217 .id_table = triflex,218 .probe = triflex_init_one,219 .remove = ata_pci_remove_one,220#ifdef CONFIG_PM_SLEEP221 .suspend = triflex_ata_pci_device_suspend,222 .resume = ata_pci_device_resume,223#endif224};225 226module_pci_driver(triflex_pci_driver);227 228MODULE_AUTHOR("Alan Cox");229MODULE_DESCRIPTION("low-level driver for Compaq Triflex");230MODULE_LICENSE("GPL");231MODULE_DEVICE_TABLE(pci, triflex);232MODULE_VERSION(DRV_VERSION);233