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/init.h> 40 #include <linux/blkdev.h> 41 #include <linux/delay.h> 42 #include <scsi/scsi_host.h> 43 #include <linux/libata.h> 44 45 #define DRV_NAME "pata_triflex" 46 #define DRV_VERSION "0.2.8" 47 48 /** 49 * triflex_prereset - probe begin 50 * @link: ATA link 51 * @deadline: deadline jiffies for the operation 52 * 53 * Set up cable type and use generic probe init 54 */ 55 56 static int triflex_prereset(struct ata_link *link, unsigned long deadline) 57 { 58 static const struct pci_bits triflex_enable_bits[] = { 59 { 0x80, 1, 0x01, 0x01 }, 60 { 0x80, 1, 0x02, 0x02 } 61 }; 62 63 struct ata_port *ap = link->ap; 64 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 65 66 if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no])) 67 return -ENOENT; 68 69 return ata_sff_prereset(link, deadline); 70 } 71 72 73 74 /** 75 * triflex_load_timing - timing configuration 76 * @ap: ATA interface 77 * @adev: Device on the bus 78 * @speed: speed to configure 79 * 80 * The Triflex has one set of timings per device per channel. This 81 * means we must do some switching. As the PIO and DMA timings don't 82 * match we have to do some reloading unlike PIIX devices where tuning 83 * tricks can avoid it. 84 */ 85 86 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed) 87 { 88 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 89 u32 timing = 0; 90 u32 triflex_timing, old_triflex_timing; 91 int channel_offset = ap->port_no ? 0x74: 0x70; 92 unsigned int is_slave = (adev->devno != 0); 93 94 95 pci_read_config_dword(pdev, channel_offset, &old_triflex_timing); 96 triflex_timing = old_triflex_timing; 97 98 switch(speed) 99 { 100 case XFER_MW_DMA_2: 101 timing = 0x0103;break; 102 case XFER_MW_DMA_1: 103 timing = 0x0203;break; 104 case XFER_MW_DMA_0: 105 timing = 0x0808;break; 106 case XFER_SW_DMA_2: 107 case XFER_SW_DMA_1: 108 case XFER_SW_DMA_0: 109 timing = 0x0F0F;break; 110 case XFER_PIO_4: 111 timing = 0x0202;break; 112 case XFER_PIO_3: 113 timing = 0x0204;break; 114 case XFER_PIO_2: 115 timing = 0x0404;break; 116 case XFER_PIO_1: 117 timing = 0x0508;break; 118 case XFER_PIO_0: 119 timing = 0x0808;break; 120 default: 121 BUG(); 122 } 123 triflex_timing &= ~ (0xFFFF << (16 * is_slave)); 124 triflex_timing |= (timing << (16 * is_slave)); 125 126 if (triflex_timing != old_triflex_timing) 127 pci_write_config_dword(pdev, channel_offset, triflex_timing); 128 } 129 130 /** 131 * triflex_set_piomode - set initial PIO mode data 132 * @ap: ATA interface 133 * @adev: ATA device 134 * 135 * Use the timing loader to set up the PIO mode. We have to do this 136 * because DMA start/stop will only be called once DMA occurs. If there 137 * has been no DMA then the PIO timings are still needed. 138 */ 139 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev) 140 { 141 triflex_load_timing(ap, adev, adev->pio_mode); 142 } 143 144 /** 145 * triflex_dma_start - DMA start callback 146 * @qc: Command in progress 147 * 148 * Usually drivers set the DMA timing at the point the set_dmamode call 149 * is made. Triflex however requires we load new timings on the 150 * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc). 151 * We load the DMA timings just before starting DMA and then restore 152 * the PIO timing when the DMA is finished. 153 */ 154 155 static void triflex_bmdma_start(struct ata_queued_cmd *qc) 156 { 157 triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode); 158 ata_bmdma_start(qc); 159 } 160 161 /** 162 * triflex_dma_stop - DMA stop callback 163 * @ap: ATA interface 164 * @adev: ATA device 165 * 166 * We loaded new timings in dma_start, as a result we need to restore 167 * the PIO timings in dma_stop so that the next command issue gets the 168 * right clock values. 169 */ 170 171 static void triflex_bmdma_stop(struct ata_queued_cmd *qc) 172 { 173 ata_bmdma_stop(qc); 174 triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode); 175 } 176 177 static struct scsi_host_template triflex_sht = { 178 ATA_BMDMA_SHT(DRV_NAME), 179 }; 180 181 static struct ata_port_operations triflex_port_ops = { 182 .inherits = &ata_bmdma_port_ops, 183 .bmdma_start = triflex_bmdma_start, 184 .bmdma_stop = triflex_bmdma_stop, 185 .cable_detect = ata_cable_40wire, 186 .set_piomode = triflex_set_piomode, 187 .prereset = triflex_prereset, 188 }; 189 190 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id) 191 { 192 static const struct ata_port_info info = { 193 .flags = ATA_FLAG_SLAVE_POSS, 194 .pio_mask = ATA_PIO4, 195 .mwdma_mask = ATA_MWDMA2, 196 .port_ops = &triflex_port_ops 197 }; 198 const struct ata_port_info *ppi[] = { &info, NULL }; 199 200 ata_print_version_once(&dev->dev, DRV_VERSION); 201 202 return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0); 203 } 204 205 static const struct pci_device_id triflex[] = { 206 { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), }, 207 208 { }, 209 }; 210 211 #ifdef CONFIG_PM 212 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg) 213 { 214 struct ata_host *host = pci_get_drvdata(pdev); 215 int rc = 0; 216 217 rc = ata_host_suspend(host, mesg); 218 if (rc) 219 return rc; 220 221 /* 222 * We must not disable or powerdown the device. 223 * APM bios refuses to suspend if IDE is not accessible. 224 */ 225 pci_save_state(pdev); 226 227 return 0; 228 } 229 230 #endif 231 232 static struct pci_driver triflex_pci_driver = { 233 .name = DRV_NAME, 234 .id_table = triflex, 235 .probe = triflex_init_one, 236 .remove = ata_pci_remove_one, 237 #ifdef CONFIG_PM 238 .suspend = triflex_ata_pci_device_suspend, 239 .resume = ata_pci_device_resume, 240 #endif 241 }; 242 243 module_pci_driver(triflex_pci_driver); 244 245 MODULE_AUTHOR("Alan Cox"); 246 MODULE_DESCRIPTION("low-level driver for Compaq Triflex"); 247 MODULE_LICENSE("GPL"); 248 MODULE_DEVICE_TABLE(pci, triflex); 249 MODULE_VERSION(DRV_VERSION); 250