1 /* 2 * New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk> 3 * 4 * TODO: Mode selection filtering 5 * TODO: Can't enable second channel until ATA core has serialize 6 * TODO: Needs custom DMA cleanup code 7 * 8 * Based very heavily on 9 * 10 * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003 11 * 12 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com> 13 * May be copied or modified under the terms of the GNU General Public License 14 * 15 * Development of this chipset driver was funded 16 * by the nice folks at National Semiconductor. 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License version 2 as 20 * published by the Free Software Foundation. 21 * 22 * This program is distributed in the hope that it will be useful, 23 * but WITHOUT ANY WARRANTY; without even the implied warranty of 24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 * GNU General Public License for more details. 26 * 27 * You should have received a copy of the GNU General Public License 28 * along with this program; if not, write to the Free Software 29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 30 * 31 */ 32 33 #include <linux/kernel.h> 34 #include <linux/module.h> 35 #include <linux/pci.h> 36 #include <linux/init.h> 37 #include <linux/blkdev.h> 38 #include <linux/delay.h> 39 #include <scsi/scsi_host.h> 40 #include <linux/libata.h> 41 42 #define DRV_NAME "sc1200" 43 #define DRV_VERSION "0.2.6" 44 45 #define SC1200_REV_A 0x00 46 #define SC1200_REV_B1 0x01 47 #define SC1200_REV_B3 0x02 48 #define SC1200_REV_C1 0x03 49 #define SC1200_REV_D1 0x04 50 51 /** 52 * sc1200_clock - PCI clock 53 * 54 * Return the PCI bus clocking for the SC1200 chipset configuration 55 * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz 56 */ 57 58 static int sc1200_clock(void) 59 { 60 /* Magic registers that give us the chipset data */ 61 u8 chip_id = inb(0x903C); 62 u8 silicon_rev = inb(0x903D); 63 u16 pci_clock; 64 65 if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1) 66 return 0; /* 33 MHz mode */ 67 68 /* Clock generator configuration 0x901E its 8/9 are the PCI clocking 69 0/3 is 33Mhz 1 is 48 2 is 66 */ 70 71 pci_clock = inw(0x901E); 72 pci_clock >>= 8; 73 pci_clock &= 0x03; 74 if (pci_clock == 3) 75 pci_clock = 0; 76 return pci_clock; 77 } 78 79 /** 80 * sc1200_set_piomode - PIO setup 81 * @ap: ATA interface 82 * @adev: device on the interface 83 * 84 * Set our PIO requirements. This is fairly simple on the SC1200 85 */ 86 87 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) 88 { 89 static const u32 pio_timings[4][5] = { 90 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz 91 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz 92 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz 93 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz 94 }; 95 96 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 97 u32 format; 98 unsigned int reg = 0x40 + 0x10 * ap->port_no; 99 int mode = adev->pio_mode - XFER_PIO_0; 100 101 pci_read_config_dword(pdev, reg + 4, &format); 102 format >>= 31; 103 format += sc1200_clock(); 104 pci_write_config_dword(pdev, reg + 8 * adev->devno, 105 pio_timings[format][mode]); 106 } 107 108 /** 109 * sc1200_set_dmamode - DMA timing setup 110 * @ap: ATA interface 111 * @adev: Device being configured 112 * 113 * We cannot mix MWDMA and UDMA without reloading timings each switch 114 * master to slave. 115 */ 116 117 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) 118 { 119 static const u32 udma_timing[3][3] = { 120 { 0x00921250, 0x00911140, 0x00911030 }, 121 { 0x00932470, 0x00922260, 0x00922140 }, 122 { 0x009436A1, 0x00933481, 0x00923261 } 123 }; 124 125 static const u32 mwdma_timing[3][3] = { 126 { 0x00077771, 0x00012121, 0x00002020 }, 127 { 0x000BBBB2, 0x00024241, 0x00013131 }, 128 { 0x000FFFF3, 0x00035352, 0x00015151 } 129 }; 130 131 int clock = sc1200_clock(); 132 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 133 unsigned int reg = 0x40 + 0x10 * ap->port_no; 134 int mode = adev->dma_mode; 135 u32 format; 136 137 if (mode >= XFER_UDMA_0) 138 format = udma_timing[clock][mode - XFER_UDMA_0]; 139 else 140 format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; 141 142 if (adev->devno == 0) { 143 u32 timings; 144 145 pci_read_config_dword(pdev, reg + 4, &timings); 146 timings &= 0x80000000UL; 147 timings |= format; 148 pci_write_config_dword(pdev, reg + 4, timings); 149 } else 150 pci_write_config_dword(pdev, reg + 12, format); 151 } 152 153 /** 154 * sc1200_qc_issue - command issue 155 * @qc: command pending 156 * 157 * Called when the libata layer is about to issue a command. We wrap 158 * this interface so that we can load the correct ATA timings if 159 * necessary. Specifically we have a problem that there is only 160 * one MWDMA/UDMA bit. 161 */ 162 163 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) 164 { 165 struct ata_port *ap = qc->ap; 166 struct ata_device *adev = qc->dev; 167 struct ata_device *prev = ap->private_data; 168 169 /* See if the DMA settings could be wrong */ 170 if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { 171 /* Maybe, but do the channels match MWDMA/UDMA ? */ 172 if ((ata_using_udma(adev) && !ata_using_udma(prev)) || 173 (ata_using_udma(prev) && !ata_using_udma(adev))) 174 /* Switch the mode bits */ 175 sc1200_set_dmamode(ap, adev); 176 } 177 178 return ata_sff_qc_issue(qc); 179 } 180 181 static struct scsi_host_template sc1200_sht = { 182 ATA_BMDMA_SHT(DRV_NAME), 183 .sg_tablesize = LIBATA_DUMB_MAX_PRD, 184 }; 185 186 static struct ata_port_operations sc1200_port_ops = { 187 .inherits = &ata_bmdma_port_ops, 188 .qc_prep = ata_sff_dumb_qc_prep, 189 .qc_issue = sc1200_qc_issue, 190 .cable_detect = ata_cable_40wire, 191 .set_piomode = sc1200_set_piomode, 192 .set_dmamode = sc1200_set_dmamode, 193 }; 194 195 /** 196 * sc1200_init_one - Initialise an SC1200 197 * @dev: PCI device 198 * @id: Entry in match table 199 * 200 * Just throw the needed data at the libata helper and it does all 201 * our work. 202 */ 203 204 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) 205 { 206 static const struct ata_port_info info = { 207 .flags = ATA_FLAG_SLAVE_POSS, 208 .pio_mask = 0x1f, 209 .mwdma_mask = 0x07, 210 .udma_mask = 0x07, 211 .port_ops = &sc1200_port_ops 212 }; 213 /* Can't enable port 2 yet, see top comments */ 214 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; 215 216 return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL); 217 } 218 219 static const struct pci_device_id sc1200[] = { 220 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, 221 222 { }, 223 }; 224 225 static struct pci_driver sc1200_pci_driver = { 226 .name = DRV_NAME, 227 .id_table = sc1200, 228 .probe = sc1200_init_one, 229 .remove = ata_pci_remove_one, 230 #ifdef CONFIG_PM 231 .suspend = ata_pci_device_suspend, 232 .resume = ata_pci_device_resume, 233 #endif 234 }; 235 236 static int __init sc1200_init(void) 237 { 238 return pci_register_driver(&sc1200_pci_driver); 239 } 240 241 static void __exit sc1200_exit(void) 242 { 243 pci_unregister_driver(&sc1200_pci_driver); 244 } 245 246 MODULE_AUTHOR("Alan Cox, Mark Lord"); 247 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200"); 248 MODULE_LICENSE("GPL"); 249 MODULE_DEVICE_TABLE(pci, sc1200); 250 MODULE_VERSION(DRV_VERSION); 251 252 module_init(sc1200_init); 253 module_exit(sc1200_exit); 254