1 /* 2 * pata_it8213.c - iTE Tech. Inc. IT8213 PATA driver 3 * 4 * The IT8213 is a very Intel ICH like device for timing purposes, having 5 * a similar register layout and the same split clock arrangement. Cable 6 * detection is different, and it does not have slave channels or all the 7 * clutter of later ICH/SATA setups. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/pci.h> 13 #include <linux/blkdev.h> 14 #include <linux/delay.h> 15 #include <linux/device.h> 16 #include <scsi/scsi_host.h> 17 #include <linux/libata.h> 18 #include <linux/ata.h> 19 20 #define DRV_NAME "pata_it8213" 21 #define DRV_VERSION "0.0.3" 22 23 /** 24 * it8213_pre_reset - probe begin 25 * @link: link 26 * @deadline: deadline jiffies for the operation 27 * 28 * Filter out ports by the enable bits before doing the normal reset 29 * and probe. 30 */ 31 32 static int it8213_pre_reset(struct ata_link *link, unsigned long deadline) 33 { 34 static const struct pci_bits it8213_enable_bits[] = { 35 { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */ 36 }; 37 struct ata_port *ap = link->ap; 38 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 39 if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no])) 40 return -ENOENT; 41 42 return ata_sff_prereset(link, deadline); 43 } 44 45 /** 46 * it8213_cable_detect - check for 40/80 pin 47 * @ap: Port 48 * 49 * Perform cable detection for the 8213 ATA interface. This is 50 * different to the PIIX arrangement 51 */ 52 53 static int it8213_cable_detect(struct ata_port *ap) 54 { 55 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 56 u8 tmp; 57 pci_read_config_byte(pdev, 0x42, &tmp); 58 if (tmp & 2) /* The initial docs are incorrect */ 59 return ATA_CBL_PATA40; 60 return ATA_CBL_PATA80; 61 } 62 63 /** 64 * it8213_set_piomode - Initialize host controller PATA PIO timings 65 * @ap: Port whose timings we are configuring 66 * @adev: Device whose timings we are configuring 67 * 68 * Set PIO mode for device, in host controller PCI config space. 69 * 70 * LOCKING: 71 * None (inherited from caller). 72 */ 73 74 static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev) 75 { 76 unsigned int pio = adev->pio_mode - XFER_PIO_0; 77 struct pci_dev *dev = to_pci_dev(ap->host->dev); 78 unsigned int master_port = ap->port_no ? 0x42 : 0x40; 79 u16 master_data; 80 int control = 0; 81 82 /* 83 * See Intel Document 298600-004 for the timing programing rules 84 * for PIIX/ICH. The 8213 is a clone so very similar 85 */ 86 87 static const /* ISP RTC */ 88 u8 timings[][2] = { { 0, 0 }, 89 { 0, 0 }, 90 { 1, 0 }, 91 { 2, 1 }, 92 { 2, 3 }, }; 93 94 if (pio > 1) 95 control |= 1; /* TIME */ 96 if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */ 97 control |= 2; /* IE */ 98 /* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */ 99 if (adev->class != ATA_DEV_ATA) 100 control |= 4; /* PPE */ 101 102 pci_read_config_word(dev, master_port, &master_data); 103 104 /* Set PPE, IE, and TIME as appropriate */ 105 if (adev->devno == 0) { 106 master_data &= 0xCCF0; 107 master_data |= control; 108 master_data |= (timings[pio][0] << 12) | 109 (timings[pio][1] << 8); 110 } else { 111 u8 slave_data; 112 113 master_data &= 0xFF0F; 114 master_data |= (control << 4); 115 116 /* Slave timing in separate register */ 117 pci_read_config_byte(dev, 0x44, &slave_data); 118 slave_data &= 0xF0; 119 slave_data |= (timings[pio][0] << 2) | timings[pio][1]; 120 pci_write_config_byte(dev, 0x44, slave_data); 121 } 122 123 master_data |= 0x4000; /* Ensure SITRE is set */ 124 pci_write_config_word(dev, master_port, master_data); 125 } 126 127 /** 128 * it8213_set_dmamode - Initialize host controller PATA DMA timings 129 * @ap: Port whose timings we are configuring 130 * @adev: Device to program 131 * 132 * Set UDMA/MWDMA mode for device, in host controller PCI config space. 133 * This device is basically an ICH alike. 134 * 135 * LOCKING: 136 * None (inherited from caller). 137 */ 138 139 static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev) 140 { 141 struct pci_dev *dev = to_pci_dev(ap->host->dev); 142 u16 master_data; 143 u8 speed = adev->dma_mode; 144 int devid = adev->devno; 145 u8 udma_enable; 146 147 static const /* ISP RTC */ 148 u8 timings[][2] = { { 0, 0 }, 149 { 0, 0 }, 150 { 1, 0 }, 151 { 2, 1 }, 152 { 2, 3 }, }; 153 154 pci_read_config_word(dev, 0x40, &master_data); 155 pci_read_config_byte(dev, 0x48, &udma_enable); 156 157 if (speed >= XFER_UDMA_0) { 158 unsigned int udma = adev->dma_mode - XFER_UDMA_0; 159 u16 udma_timing; 160 u16 ideconf; 161 int u_clock, u_speed; 162 163 /* Clocks follow the PIIX style */ 164 u_speed = min(2 - (udma & 1), udma); 165 if (udma > 4) 166 u_clock = 0x1000; /* 100Mhz */ 167 else if (udma > 2) 168 u_clock = 1; /* 66Mhz */ 169 else 170 u_clock = 0; /* 33Mhz */ 171 172 udma_enable |= (1 << devid); 173 174 /* Load the UDMA cycle time */ 175 pci_read_config_word(dev, 0x4A, &udma_timing); 176 udma_timing &= ~(3 << (4 * devid)); 177 udma_timing |= u_speed << (4 * devid); 178 pci_write_config_word(dev, 0x4A, udma_timing); 179 180 /* Load the clock selection */ 181 pci_read_config_word(dev, 0x54, &ideconf); 182 ideconf &= ~(0x1001 << devid); 183 ideconf |= u_clock << devid; 184 pci_write_config_word(dev, 0x54, ideconf); 185 } else { 186 /* 187 * MWDMA is driven by the PIO timings. We must also enable 188 * IORDY unconditionally along with TIME1. PPE has already 189 * been set when the PIO timing was set. 190 */ 191 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; 192 unsigned int control; 193 u8 slave_data; 194 static const unsigned int needed_pio[3] = { 195 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 196 }; 197 int pio = needed_pio[mwdma] - XFER_PIO_0; 198 199 control = 3; /* IORDY|TIME1 */ 200 201 /* If the drive MWDMA is faster than it can do PIO then 202 we must force PIO into PIO0 */ 203 204 if (adev->pio_mode < needed_pio[mwdma]) 205 /* Enable DMA timing only */ 206 control |= 8; /* PIO cycles in PIO0 */ 207 208 if (devid) { /* Slave */ 209 master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */ 210 master_data |= control << 4; 211 pci_read_config_byte(dev, 0x44, &slave_data); 212 slave_data &= 0xF0; 213 /* Load the matching timing */ 214 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); 215 pci_write_config_byte(dev, 0x44, slave_data); 216 } else { /* Master */ 217 master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY 218 and master timing bits */ 219 master_data |= control; 220 master_data |= 221 (timings[pio][0] << 12) | 222 (timings[pio][1] << 8); 223 } 224 udma_enable &= ~(1 << devid); 225 pci_write_config_word(dev, 0x40, master_data); 226 } 227 pci_write_config_byte(dev, 0x48, udma_enable); 228 } 229 230 static struct scsi_host_template it8213_sht = { 231 ATA_BMDMA_SHT(DRV_NAME), 232 }; 233 234 235 static struct ata_port_operations it8213_ops = { 236 .inherits = &ata_bmdma_port_ops, 237 .cable_detect = it8213_cable_detect, 238 .set_piomode = it8213_set_piomode, 239 .set_dmamode = it8213_set_dmamode, 240 .prereset = it8213_pre_reset, 241 }; 242 243 244 /** 245 * it8213_init_one - Register 8213 ATA PCI device with kernel services 246 * @pdev: PCI device to register 247 * @ent: Entry in it8213_pci_tbl matching with @pdev 248 * 249 * Called from kernel PCI layer. 250 * 251 * LOCKING: 252 * Inherited from PCI layer (may sleep). 253 * 254 * RETURNS: 255 * Zero on success, or -ERRNO value. 256 */ 257 258 static int it8213_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) 259 { 260 static const struct ata_port_info info = { 261 .flags = ATA_FLAG_SLAVE_POSS, 262 .pio_mask = ATA_PIO4, 263 .mwdma_mask = ATA_MWDMA12_ONLY, 264 .udma_mask = ATA_UDMA6, 265 .port_ops = &it8213_ops, 266 }; 267 /* Current IT8213 stuff is single port */ 268 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; 269 270 ata_print_version_once(&pdev->dev, DRV_VERSION); 271 272 return ata_pci_bmdma_init_one(pdev, ppi, &it8213_sht, NULL, 0); 273 } 274 275 static const struct pci_device_id it8213_pci_tbl[] = { 276 { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), }, 277 278 { } /* terminate list */ 279 }; 280 281 static struct pci_driver it8213_pci_driver = { 282 .name = DRV_NAME, 283 .id_table = it8213_pci_tbl, 284 .probe = it8213_init_one, 285 .remove = ata_pci_remove_one, 286 #ifdef CONFIG_PM_SLEEP 287 .suspend = ata_pci_device_suspend, 288 .resume = ata_pci_device_resume, 289 #endif 290 }; 291 292 module_pci_driver(it8213_pci_driver); 293 294 MODULE_AUTHOR("Alan Cox"); 295 MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213"); 296 MODULE_LICENSE("GPL"); 297 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl); 298 MODULE_VERSION(DRV_VERSION); 299