1 /* 2 * New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk> 3 * 4 * TODO: Mode selection filtering 5 * TODO: Needs custom DMA cleanup code 6 * 7 * Based very heavily on 8 * 9 * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003 10 * 11 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com> 12 * May be copied or modified under the terms of the GNU General Public License 13 * 14 * Development of this chipset driver was funded 15 * by the nice folks at National Semiconductor. 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 */ 31 32 #include <linux/kernel.h> 33 #include <linux/module.h> 34 #include <linux/pci.h> 35 #include <linux/init.h> 36 #include <linux/blkdev.h> 37 #include <linux/delay.h> 38 #include <scsi/scsi_host.h> 39 #include <linux/libata.h> 40 41 #define DRV_NAME "pata_sc1200" 42 #define DRV_VERSION "0.2.6" 43 44 #define SC1200_REV_A 0x00 45 #define SC1200_REV_B1 0x01 46 #define SC1200_REV_B3 0x02 47 #define SC1200_REV_C1 0x03 48 #define SC1200_REV_D1 0x04 49 50 /** 51 * sc1200_clock - PCI clock 52 * 53 * Return the PCI bus clocking for the SC1200 chipset configuration 54 * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz 55 */ 56 57 static int sc1200_clock(void) 58 { 59 /* Magic registers that give us the chipset data */ 60 u8 chip_id = inb(0x903C); 61 u8 silicon_rev = inb(0x903D); 62 u16 pci_clock; 63 64 if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1) 65 return 0; /* 33 MHz mode */ 66 67 /* Clock generator configuration 0x901E its 8/9 are the PCI clocking 68 0/3 is 33Mhz 1 is 48 2 is 66 */ 69 70 pci_clock = inw(0x901E); 71 pci_clock >>= 8; 72 pci_clock &= 0x03; 73 if (pci_clock == 3) 74 pci_clock = 0; 75 return pci_clock; 76 } 77 78 /** 79 * sc1200_set_piomode - PIO setup 80 * @ap: ATA interface 81 * @adev: device on the interface 82 * 83 * Set our PIO requirements. This is fairly simple on the SC1200 84 */ 85 86 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) 87 { 88 static const u32 pio_timings[4][5] = { 89 /* format0, 33Mhz */ 90 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 }, 91 /* format1, 33Mhz */ 92 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 }, 93 /* format1, 48Mhz */ 94 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 }, 95 /* format1, 66Mhz */ 96 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 } 97 }; 98 99 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 100 u32 format; 101 unsigned int reg = 0x40 + 0x10 * ap->port_no; 102 int mode = adev->pio_mode - XFER_PIO_0; 103 104 pci_read_config_dword(pdev, reg + 4, &format); 105 format >>= 31; 106 format += sc1200_clock(); 107 pci_write_config_dword(pdev, reg + 8 * adev->devno, 108 pio_timings[format][mode]); 109 } 110 111 /** 112 * sc1200_set_dmamode - DMA timing setup 113 * @ap: ATA interface 114 * @adev: Device being configured 115 * 116 * We cannot mix MWDMA and UDMA without reloading timings each switch 117 * master to slave. 118 */ 119 120 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) 121 { 122 static const u32 udma_timing[3][3] = { 123 { 0x00921250, 0x00911140, 0x00911030 }, 124 { 0x00932470, 0x00922260, 0x00922140 }, 125 { 0x009436A1, 0x00933481, 0x00923261 } 126 }; 127 128 static const u32 mwdma_timing[3][3] = { 129 { 0x00077771, 0x00012121, 0x00002020 }, 130 { 0x000BBBB2, 0x00024241, 0x00013131 }, 131 { 0x000FFFF3, 0x00035352, 0x00015151 } 132 }; 133 134 int clock = sc1200_clock(); 135 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 136 unsigned int reg = 0x40 + 0x10 * ap->port_no; 137 int mode = adev->dma_mode; 138 u32 format; 139 140 if (mode >= XFER_UDMA_0) 141 format = udma_timing[clock][mode - XFER_UDMA_0]; 142 else 143 format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; 144 145 if (adev->devno == 0) { 146 u32 timings; 147 148 pci_read_config_dword(pdev, reg + 4, &timings); 149 timings &= 0x80000000UL; 150 timings |= format; 151 pci_write_config_dword(pdev, reg + 4, timings); 152 } else 153 pci_write_config_dword(pdev, reg + 12, format); 154 } 155 156 /** 157 * sc1200_qc_issue - command issue 158 * @qc: command pending 159 * 160 * Called when the libata layer is about to issue a command. We wrap 161 * this interface so that we can load the correct ATA timings if 162 * necessary. Specifically we have a problem that there is only 163 * one MWDMA/UDMA bit. 164 */ 165 166 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) 167 { 168 struct ata_port *ap = qc->ap; 169 struct ata_device *adev = qc->dev; 170 struct ata_device *prev = ap->private_data; 171 172 /* See if the DMA settings could be wrong */ 173 if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { 174 /* Maybe, but do the channels match MWDMA/UDMA ? */ 175 if ((ata_using_udma(adev) && !ata_using_udma(prev)) || 176 (ata_using_udma(prev) && !ata_using_udma(adev))) 177 /* Switch the mode bits */ 178 sc1200_set_dmamode(ap, adev); 179 } 180 181 return ata_bmdma_qc_issue(qc); 182 } 183 184 /** 185 * sc1200_qc_defer - implement serialization 186 * @qc: command 187 * 188 * Serialize command issue on this controller. 189 */ 190 191 static int sc1200_qc_defer(struct ata_queued_cmd *qc) 192 { 193 struct ata_host *host = qc->ap->host; 194 struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; 195 int rc; 196 197 /* First apply the usual rules */ 198 rc = ata_std_qc_defer(qc); 199 if (rc != 0) 200 return rc; 201 202 /* Now apply serialization rules. Only allow a command if the 203 other channel state machine is idle */ 204 if (alt && alt->qc_active) 205 return ATA_DEFER_PORT; 206 return 0; 207 } 208 209 static struct scsi_host_template sc1200_sht = { 210 ATA_BMDMA_SHT(DRV_NAME), 211 .sg_tablesize = LIBATA_DUMB_MAX_PRD, 212 }; 213 214 static struct ata_port_operations sc1200_port_ops = { 215 .inherits = &ata_bmdma_port_ops, 216 .qc_prep = ata_bmdma_dumb_qc_prep, 217 .qc_issue = sc1200_qc_issue, 218 .qc_defer = sc1200_qc_defer, 219 .cable_detect = ata_cable_40wire, 220 .set_piomode = sc1200_set_piomode, 221 .set_dmamode = sc1200_set_dmamode, 222 }; 223 224 /** 225 * sc1200_init_one - Initialise an SC1200 226 * @dev: PCI device 227 * @id: Entry in match table 228 * 229 * Just throw the needed data at the libata helper and it does all 230 * our work. 231 */ 232 233 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) 234 { 235 static const struct ata_port_info info = { 236 .flags = ATA_FLAG_SLAVE_POSS, 237 .pio_mask = ATA_PIO4, 238 .mwdma_mask = ATA_MWDMA2, 239 .udma_mask = ATA_UDMA2, 240 .port_ops = &sc1200_port_ops 241 }; 242 const struct ata_port_info *ppi[] = { &info, NULL }; 243 244 return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0); 245 } 246 247 static const struct pci_device_id sc1200[] = { 248 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, 249 250 { }, 251 }; 252 253 static struct pci_driver sc1200_pci_driver = { 254 .name = DRV_NAME, 255 .id_table = sc1200, 256 .probe = sc1200_init_one, 257 .remove = ata_pci_remove_one, 258 #ifdef CONFIG_PM 259 .suspend = ata_pci_device_suspend, 260 .resume = ata_pci_device_resume, 261 #endif 262 }; 263 264 module_pci_driver(sc1200_pci_driver); 265 266 MODULE_AUTHOR("Alan Cox, Mark Lord"); 267 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200"); 268 MODULE_LICENSE("GPL"); 269 MODULE_DEVICE_TABLE(pci, sc1200); 270 MODULE_VERSION(DRV_VERSION); 271