1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk> 4 * 5 * TODO: Mode selection filtering 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 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/pci.h> 22 #include <linux/blkdev.h> 23 #include <linux/delay.h> 24 #include <scsi/scsi_host.h> 25 #include <linux/libata.h> 26 27 #define DRV_NAME "pata_sc1200" 28 #define DRV_VERSION "0.2.6" 29 30 #define SC1200_REV_A 0x00 31 #define SC1200_REV_B1 0x01 32 #define SC1200_REV_B3 0x02 33 #define SC1200_REV_C1 0x03 34 #define SC1200_REV_D1 0x04 35 36 /** 37 * sc1200_clock - PCI clock 38 * 39 * Return the PCI bus clocking for the SC1200 chipset configuration 40 * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz 41 */ 42 43 static int sc1200_clock(void) 44 { 45 /* Magic registers that give us the chipset data */ 46 u8 chip_id = inb(0x903C); 47 u8 silicon_rev = inb(0x903D); 48 u16 pci_clock; 49 50 if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1) 51 return 0; /* 33 MHz mode */ 52 53 /* Clock generator configuration 0x901E its 8/9 are the PCI clocking 54 0/3 is 33Mhz 1 is 48 2 is 66 */ 55 56 pci_clock = inw(0x901E); 57 pci_clock >>= 8; 58 pci_clock &= 0x03; 59 if (pci_clock == 3) 60 pci_clock = 0; 61 return pci_clock; 62 } 63 64 /** 65 * sc1200_set_piomode - PIO setup 66 * @ap: ATA interface 67 * @adev: device on the interface 68 * 69 * Set our PIO requirements. This is fairly simple on the SC1200 70 */ 71 72 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) 73 { 74 static const u32 pio_timings[4][5] = { 75 /* format0, 33Mhz */ 76 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 }, 77 /* format1, 33Mhz */ 78 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 }, 79 /* format1, 48Mhz */ 80 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 }, 81 /* format1, 66Mhz */ 82 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 } 83 }; 84 85 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 86 u32 format; 87 unsigned int reg = 0x40 + 0x10 * ap->port_no; 88 int mode = adev->pio_mode - XFER_PIO_0; 89 90 pci_read_config_dword(pdev, reg + 4, &format); 91 format >>= 31; 92 format += sc1200_clock(); 93 pci_write_config_dword(pdev, reg + 8 * adev->devno, 94 pio_timings[format][mode]); 95 } 96 97 /** 98 * sc1200_set_dmamode - DMA timing setup 99 * @ap: ATA interface 100 * @adev: Device being configured 101 * 102 * We cannot mix MWDMA and UDMA without reloading timings each switch 103 * master to slave. 104 */ 105 106 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) 107 { 108 static const u32 udma_timing[3][3] = { 109 { 0x00921250, 0x00911140, 0x00911030 }, 110 { 0x00932470, 0x00922260, 0x00922140 }, 111 { 0x009436A1, 0x00933481, 0x00923261 } 112 }; 113 114 static const u32 mwdma_timing[3][3] = { 115 { 0x00077771, 0x00012121, 0x00002020 }, 116 { 0x000BBBB2, 0x00024241, 0x00013131 }, 117 { 0x000FFFF3, 0x00035352, 0x00015151 } 118 }; 119 120 int clock = sc1200_clock(); 121 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 122 unsigned int reg = 0x40 + 0x10 * ap->port_no; 123 int mode = adev->dma_mode; 124 u32 format; 125 126 if (mode >= XFER_UDMA_0) 127 format = udma_timing[clock][mode - XFER_UDMA_0]; 128 else 129 format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; 130 131 if (adev->devno == 0) { 132 u32 timings; 133 134 pci_read_config_dword(pdev, reg + 4, &timings); 135 timings &= 0x80000000UL; 136 timings |= format; 137 pci_write_config_dword(pdev, reg + 4, timings); 138 } else 139 pci_write_config_dword(pdev, reg + 12, format); 140 } 141 142 /** 143 * sc1200_qc_issue - command issue 144 * @qc: command pending 145 * 146 * Called when the libata layer is about to issue a command. We wrap 147 * this interface so that we can load the correct ATA timings if 148 * necessary. Specifically we have a problem that there is only 149 * one MWDMA/UDMA bit. 150 */ 151 152 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) 153 { 154 struct ata_port *ap = qc->ap; 155 struct ata_device *adev = qc->dev; 156 struct ata_device *prev = ap->private_data; 157 158 /* See if the DMA settings could be wrong */ 159 if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { 160 /* Maybe, but do the channels match MWDMA/UDMA ? */ 161 if ((ata_using_udma(adev) && !ata_using_udma(prev)) || 162 (ata_using_udma(prev) && !ata_using_udma(adev))) 163 /* Switch the mode bits */ 164 sc1200_set_dmamode(ap, adev); 165 } 166 167 return ata_bmdma_qc_issue(qc); 168 } 169 170 /** 171 * sc1200_qc_defer - implement serialization 172 * @qc: command 173 * 174 * Serialize command issue on this controller. 175 */ 176 177 static int sc1200_qc_defer(struct ata_queued_cmd *qc) 178 { 179 struct ata_host *host = qc->ap->host; 180 struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; 181 int rc; 182 183 /* First apply the usual rules */ 184 rc = ata_std_qc_defer(qc); 185 if (rc != 0) 186 return rc; 187 188 /* Now apply serialization rules. Only allow a command if the 189 other channel state machine is idle */ 190 if (alt && alt->qc_active) 191 return ATA_DEFER_PORT; 192 return 0; 193 } 194 195 static const struct scsi_host_template sc1200_sht = { 196 ATA_BASE_SHT(DRV_NAME), 197 .sg_tablesize = LIBATA_DUMB_MAX_PRD, 198 .dma_boundary = ATA_DMA_BOUNDARY, 199 }; 200 201 static struct ata_port_operations sc1200_port_ops = { 202 .inherits = &ata_bmdma_port_ops, 203 .qc_prep = ata_bmdma_dumb_qc_prep, 204 .qc_issue = sc1200_qc_issue, 205 .qc_defer = sc1200_qc_defer, 206 .cable_detect = ata_cable_40wire, 207 .set_piomode = sc1200_set_piomode, 208 .set_dmamode = sc1200_set_dmamode, 209 }; 210 211 /** 212 * sc1200_init_one - Initialise an SC1200 213 * @dev: PCI device 214 * @id: Entry in match table 215 * 216 * Just throw the needed data at the libata helper and it does all 217 * our work. 218 */ 219 220 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) 221 { 222 static const struct ata_port_info info = { 223 .flags = ATA_FLAG_SLAVE_POSS, 224 .pio_mask = ATA_PIO4, 225 .mwdma_mask = ATA_MWDMA2, 226 .udma_mask = ATA_UDMA2, 227 .port_ops = &sc1200_port_ops 228 }; 229 const struct ata_port_info *ppi[] = { &info, NULL }; 230 231 return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0); 232 } 233 234 static const struct pci_device_id sc1200[] = { 235 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, 236 237 { }, 238 }; 239 240 static struct pci_driver sc1200_pci_driver = { 241 .name = DRV_NAME, 242 .id_table = sc1200, 243 .probe = sc1200_init_one, 244 .remove = ata_pci_remove_one, 245 #ifdef CONFIG_PM_SLEEP 246 .suspend = ata_pci_device_suspend, 247 .resume = ata_pci_device_resume, 248 #endif 249 }; 250 251 module_pci_driver(sc1200_pci_driver); 252 253 MODULE_AUTHOR("Alan Cox, Mark Lord"); 254 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200"); 255 MODULE_LICENSE("GPL"); 256 MODULE_DEVICE_TABLE(pci, sc1200); 257 MODULE_VERSION(DRV_VERSION); 258