1 /* 2 * pata_triflex.c - Compaq PATA for new ATA layer 3 * (C) 2005 Red Hat Inc 4 * Alan Cox <alan@lxorguk.ukuu.org.uk> 5 * 6 * based upon 7 * 8 * triflex.c 9 * 10 * IDE Chipset driver for the Compaq TriFlex IDE controller. 11 * 12 * Known to work with the Compaq Workstation 5x00 series. 13 * 14 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P. 15 * Author: Torben Mathiasen <torben.mathiasen@hp.com> 16 * 17 * This program is free software; you can redistribute it and/or modify 18 * it under the terms of the GNU General Public License version 2 as 19 * published by the Free Software Foundation. 20 * 21 * This program is distributed in the hope that it will be useful, 22 * but WITHOUT ANY WARRANTY; without even the implied warranty of 23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24 * GNU General Public License for more details. 25 * 26 * You should have received a copy of the GNU General Public License 27 * along with this program; if not, write to the Free Software 28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 29 * 30 * Loosely based on the piix & svwks drivers. 31 * 32 * Documentation: 33 * Not publicly available. 34 */ 35 36 #include <linux/kernel.h> 37 #include <linux/module.h> 38 #include <linux/pci.h> 39 #include <linux/blkdev.h> 40 #include <linux/delay.h> 41 #include <scsi/scsi_host.h> 42 #include <linux/libata.h> 43 44 #define DRV_NAME "pata_triflex" 45 #define DRV_VERSION "0.2.8" 46 47 /** 48 * triflex_prereset - probe begin 49 * @link: ATA link 50 * @deadline: deadline jiffies for the operation 51 * 52 * Set up cable type and use generic probe init 53 */ 54 55 static int triflex_prereset(struct ata_link *link, unsigned long deadline) 56 { 57 static const struct pci_bits triflex_enable_bits[] = { 58 { 0x80, 1, 0x01, 0x01 }, 59 { 0x80, 1, 0x02, 0x02 } 60 }; 61 62 struct ata_port *ap = link->ap; 63 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 64 65 if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no])) 66 return -ENOENT; 67 68 return ata_sff_prereset(link, deadline); 69 } 70 71 72 73 /** 74 * triflex_load_timing - timing configuration 75 * @ap: ATA interface 76 * @adev: Device on the bus 77 * @speed: speed to configure 78 * 79 * The Triflex has one set of timings per device per channel. This 80 * means we must do some switching. As the PIO and DMA timings don't 81 * match we have to do some reloading unlike PIIX devices where tuning 82 * tricks can avoid it. 83 */ 84 85 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed) 86 { 87 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 88 u32 timing = 0; 89 u32 triflex_timing, old_triflex_timing; 90 int channel_offset = ap->port_no ? 0x74: 0x70; 91 unsigned int is_slave = (adev->devno != 0); 92 93 94 pci_read_config_dword(pdev, channel_offset, &old_triflex_timing); 95 triflex_timing = old_triflex_timing; 96 97 switch(speed) 98 { 99 case XFER_MW_DMA_2: 100 timing = 0x0103;break; 101 case XFER_MW_DMA_1: 102 timing = 0x0203;break; 103 case XFER_MW_DMA_0: 104 timing = 0x0808;break; 105 case XFER_SW_DMA_2: 106 case XFER_SW_DMA_1: 107 case XFER_SW_DMA_0: 108 timing = 0x0F0F;break; 109 case XFER_PIO_4: 110 timing = 0x0202;break; 111 case XFER_PIO_3: 112 timing = 0x0204;break; 113 case XFER_PIO_2: 114 timing = 0x0404;break; 115 case XFER_PIO_1: 116 timing = 0x0508;break; 117 case XFER_PIO_0: 118 timing = 0x0808;break; 119 default: 120 BUG(); 121 } 122 triflex_timing &= ~ (0xFFFF << (16 * is_slave)); 123 triflex_timing |= (timing << (16 * is_slave)); 124 125 if (triflex_timing != old_triflex_timing) 126 pci_write_config_dword(pdev, channel_offset, triflex_timing); 127 } 128 129 /** 130 * triflex_set_piomode - set initial PIO mode data 131 * @ap: ATA interface 132 * @adev: ATA device 133 * 134 * Use the timing loader to set up the PIO mode. We have to do this 135 * because DMA start/stop will only be called once DMA occurs. If there 136 * has been no DMA then the PIO timings are still needed. 137 */ 138 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev) 139 { 140 triflex_load_timing(ap, adev, adev->pio_mode); 141 } 142 143 /** 144 * triflex_dma_start - DMA start callback 145 * @qc: Command in progress 146 * 147 * Usually drivers set the DMA timing at the point the set_dmamode call 148 * is made. Triflex however requires we load new timings on the 149 * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc). 150 * We load the DMA timings just before starting DMA and then restore 151 * the PIO timing when the DMA is finished. 152 */ 153 154 static void triflex_bmdma_start(struct ata_queued_cmd *qc) 155 { 156 triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode); 157 ata_bmdma_start(qc); 158 } 159 160 /** 161 * triflex_dma_stop - DMA stop callback 162 * @ap: ATA interface 163 * @adev: ATA device 164 * 165 * We loaded new timings in dma_start, as a result we need to restore 166 * the PIO timings in dma_stop so that the next command issue gets the 167 * right clock values. 168 */ 169 170 static void triflex_bmdma_stop(struct ata_queued_cmd *qc) 171 { 172 ata_bmdma_stop(qc); 173 triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode); 174 } 175 176 static struct scsi_host_template triflex_sht = { 177 ATA_BMDMA_SHT(DRV_NAME), 178 }; 179 180 static struct ata_port_operations triflex_port_ops = { 181 .inherits = &ata_bmdma_port_ops, 182 .bmdma_start = triflex_bmdma_start, 183 .bmdma_stop = triflex_bmdma_stop, 184 .cable_detect = ata_cable_40wire, 185 .set_piomode = triflex_set_piomode, 186 .prereset = triflex_prereset, 187 }; 188 189 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id) 190 { 191 static const struct ata_port_info info = { 192 .flags = ATA_FLAG_SLAVE_POSS, 193 .pio_mask = ATA_PIO4, 194 .mwdma_mask = ATA_MWDMA2, 195 .port_ops = &triflex_port_ops 196 }; 197 const struct ata_port_info *ppi[] = { &info, NULL }; 198 199 ata_print_version_once(&dev->dev, DRV_VERSION); 200 201 return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0); 202 } 203 204 static const struct pci_device_id triflex[] = { 205 { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), }, 206 207 { }, 208 }; 209 210 #ifdef CONFIG_PM_SLEEP 211 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg) 212 { 213 struct ata_host *host = pci_get_drvdata(pdev); 214 int rc = 0; 215 216 rc = ata_host_suspend(host, mesg); 217 if (rc) 218 return rc; 219 220 /* 221 * We must not disable or powerdown the device. 222 * APM bios refuses to suspend if IDE is not accessible. 223 */ 224 pci_save_state(pdev); 225 226 return 0; 227 } 228 229 #endif 230 231 static struct pci_driver triflex_pci_driver = { 232 .name = DRV_NAME, 233 .id_table = triflex, 234 .probe = triflex_init_one, 235 .remove = ata_pci_remove_one, 236 #ifdef CONFIG_PM_SLEEP 237 .suspend = triflex_ata_pci_device_suspend, 238 .resume = ata_pci_device_resume, 239 #endif 240 }; 241 242 module_pci_driver(triflex_pci_driver); 243 244 MODULE_AUTHOR("Alan Cox"); 245 MODULE_DESCRIPTION("low-level driver for Compaq Triflex"); 246 MODULE_LICENSE("GPL"); 247 MODULE_DEVICE_TABLE(pci, triflex); 248 MODULE_VERSION(DRV_VERSION); 249