1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * pata_triflex.c - Compaq PATA for new ATA layer 4 * (C) 2005 Red Hat Inc 5 * Alan Cox <alan@lxorguk.ukuu.org.uk> 6 * 7 * based upon 8 * 9 * triflex.c 10 * 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 begin 37 * @link: ATA link 38 * @deadline: deadline jiffies for the operation 39 * 40 * Set up cable type and use generic probe init 41 */ 42 43 static 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 configuration 63 * @ap: ATA interface 64 * @adev: Device on the bus 65 * @speed: speed to configure 66 * 67 * The Triflex has one set of timings per device per channel. This 68 * means we must do some switching. As the PIO and DMA timings don't 69 * match we have to do some reloading unlike PIIX devices where tuning 70 * tricks can avoid it. 71 */ 72 73 static 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 data 119 * @ap: ATA interface 120 * @adev: ATA device 121 * 122 * Use the timing loader to set up the PIO mode. We have to do this 123 * because DMA start/stop will only be called once DMA occurs. If there 124 * has been no DMA then the PIO timings are still needed. 125 */ 126 static 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 callback 133 * @qc: Command in progress 134 * 135 * Usually drivers set the DMA timing at the point the set_dmamode call 136 * is made. Triflex however requires we load new timings on the 137 * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc). 138 * We load the DMA timings just before starting DMA and then restore 139 * the PIO timing when the DMA is finished. 140 */ 141 142 static 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 callback 150 * @qc: ATA command 151 * 152 * We loaded new timings in dma_start, as a result we need to restore 153 * the PIO timings in dma_stop so that the next command issue gets the 154 * right clock values. 155 */ 156 157 static 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 } 162 163 static struct scsi_host_template triflex_sht = { 164 ATA_BMDMA_SHT(DRV_NAME), 165 }; 166 167 static 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 }; 175 176 static 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_ops 183 }; 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 } 190 191 static const struct pci_device_id triflex[] = { 192 { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), }, 193 194 { }, 195 }; 196 197 #ifdef CONFIG_PM_SLEEP 198 static 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 int rc = 0; 202 203 rc = ata_host_suspend(host, mesg); 204 if (rc) 205 return rc; 206 207 /* 208 * We must not disable or powerdown the device. 209 * APM bios refuses to suspend if IDE is not accessible. 210 */ 211 pci_save_state(pdev); 212 213 return 0; 214 } 215 216 #endif 217 218 static struct pci_driver triflex_pci_driver = { 219 .name = DRV_NAME, 220 .id_table = triflex, 221 .probe = triflex_init_one, 222 .remove = ata_pci_remove_one, 223 #ifdef CONFIG_PM_SLEEP 224 .suspend = triflex_ata_pci_device_suspend, 225 .resume = ata_pci_device_resume, 226 #endif 227 }; 228 229 module_pci_driver(triflex_pci_driver); 230 231 MODULE_AUTHOR("Alan Cox"); 232 MODULE_DESCRIPTION("low-level driver for Compaq Triflex"); 233 MODULE_LICENSE("GPL"); 234 MODULE_DEVICE_TABLE(pci, triflex); 235 MODULE_VERSION(DRV_VERSION); 236