1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * pata_efar.c - EFAR PIIX clone controller driver 4 * 5 * (C) 2005 Red Hat 6 * (C) 2009-2010 Bartlomiej Zolnierkiewicz 7 * 8 * Some parts based on ata_piix.c by Jeff Garzik and others. 9 * 10 * The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later 11 * Intel ICH controllers the EFAR widened the UDMA mode register bits 12 * and doesn't require the funky clock selection. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/pci.h> 18 #include <linux/blkdev.h> 19 #include <linux/delay.h> 20 #include <linux/device.h> 21 #include <scsi/scsi_host.h> 22 #include <linux/libata.h> 23 #include <linux/ata.h> 24 25 #define DRV_NAME "pata_efar" 26 #define DRV_VERSION "0.4.5" 27 28 /** 29 * efar_pre_reset - Enable bits 30 * @link: ATA link 31 * @deadline: deadline jiffies for the operation 32 * 33 * Perform cable detection for the EFAR ATA interface. This is 34 * different to the PIIX arrangement 35 */ 36 37 static int efar_pre_reset(struct ata_link *link, unsigned long deadline) 38 { 39 static const struct pci_bits efar_enable_bits[] = { 40 { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */ 41 { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */ 42 }; 43 struct ata_port *ap = link->ap; 44 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 45 46 if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no])) 47 return -ENOENT; 48 49 return ata_sff_prereset(link, deadline); 50 } 51 52 /** 53 * efar_cable_detect - check for 40/80 pin 54 * @ap: Port 55 * 56 * Perform cable detection for the EFAR ATA interface. This is 57 * different to the PIIX arrangement 58 */ 59 60 static int efar_cable_detect(struct ata_port *ap) 61 { 62 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 63 u8 tmp; 64 65 pci_read_config_byte(pdev, 0x47, &tmp); 66 if (tmp & (2 >> ap->port_no)) 67 return ATA_CBL_PATA40; 68 return ATA_CBL_PATA80; 69 } 70 71 static DEFINE_SPINLOCK(efar_lock); 72 73 /** 74 * efar_set_piomode - Initialize host controller PATA PIO timings 75 * @ap: Port whose timings we are configuring 76 * @adev: Device to program 77 * 78 * Set PIO mode for device, in host controller PCI config space. 79 * 80 * LOCKING: 81 * None (inherited from caller). 82 */ 83 84 static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev) 85 { 86 unsigned int pio = adev->pio_mode - XFER_PIO_0; 87 struct pci_dev *dev = to_pci_dev(ap->host->dev); 88 unsigned int master_port = ap->port_no ? 0x42 : 0x40; 89 unsigned long flags; 90 u16 master_data; 91 u8 udma_enable; 92 int control = 0; 93 94 /* 95 * See Intel Document 298600-004 for the timing programing rules 96 * for PIIX/ICH. The EFAR is a clone so very similar 97 */ 98 99 static const /* ISP RTC */ 100 u8 timings[][2] = { { 0, 0 }, 101 { 0, 0 }, 102 { 1, 0 }, 103 { 2, 1 }, 104 { 2, 3 }, }; 105 106 if (pio > 1) 107 control |= 1; /* TIME */ 108 if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */ 109 control |= 2; /* IE */ 110 /* Intel specifies that the prefetch/posting is for disk only */ 111 if (adev->class == ATA_DEV_ATA) 112 control |= 4; /* PPE */ 113 114 spin_lock_irqsave(&efar_lock, flags); 115 116 pci_read_config_word(dev, master_port, &master_data); 117 118 /* Set PPE, IE, and TIME as appropriate */ 119 if (adev->devno == 0) { 120 master_data &= 0xCCF0; 121 master_data |= control; 122 master_data |= (timings[pio][0] << 12) | 123 (timings[pio][1] << 8); 124 } else { 125 int shift = 4 * ap->port_no; 126 u8 slave_data; 127 128 master_data &= 0xFF0F; 129 master_data |= (control << 4); 130 131 /* Slave timing in separate register */ 132 pci_read_config_byte(dev, 0x44, &slave_data); 133 slave_data &= ap->port_no ? 0x0F : 0xF0; 134 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift; 135 pci_write_config_byte(dev, 0x44, slave_data); 136 } 137 138 master_data |= 0x4000; /* Ensure SITRE is set */ 139 pci_write_config_word(dev, master_port, master_data); 140 141 pci_read_config_byte(dev, 0x48, &udma_enable); 142 udma_enable &= ~(1 << (2 * ap->port_no + adev->devno)); 143 pci_write_config_byte(dev, 0x48, udma_enable); 144 spin_unlock_irqrestore(&efar_lock, flags); 145 } 146 147 /** 148 * efar_set_dmamode - Initialize host controller PATA DMA timings 149 * @ap: Port whose timings we are configuring 150 * @adev: Device to program 151 * 152 * Set UDMA/MWDMA mode for device, in host controller PCI config space. 153 * 154 * LOCKING: 155 * None (inherited from caller). 156 */ 157 158 static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev) 159 { 160 struct pci_dev *dev = to_pci_dev(ap->host->dev); 161 u8 master_port = ap->port_no ? 0x42 : 0x40; 162 u16 master_data; 163 u8 speed = adev->dma_mode; 164 int devid = adev->devno + 2 * ap->port_no; 165 unsigned long flags; 166 u8 udma_enable; 167 168 static const /* ISP RTC */ 169 u8 timings[][2] = { { 0, 0 }, 170 { 0, 0 }, 171 { 1, 0 }, 172 { 2, 1 }, 173 { 2, 3 }, }; 174 175 spin_lock_irqsave(&efar_lock, flags); 176 177 pci_read_config_word(dev, master_port, &master_data); 178 pci_read_config_byte(dev, 0x48, &udma_enable); 179 180 if (speed >= XFER_UDMA_0) { 181 unsigned int udma = adev->dma_mode - XFER_UDMA_0; 182 u16 udma_timing; 183 184 udma_enable |= (1 << devid); 185 186 /* Load the UDMA mode number */ 187 pci_read_config_word(dev, 0x4A, &udma_timing); 188 udma_timing &= ~(7 << (4 * devid)); 189 udma_timing |= udma << (4 * devid); 190 pci_write_config_word(dev, 0x4A, udma_timing); 191 } else { 192 /* 193 * MWDMA is driven by the PIO timings. We must also enable 194 * IORDY unconditionally along with TIME1. PPE has already 195 * been set when the PIO timing was set. 196 */ 197 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; 198 unsigned int control; 199 u8 slave_data; 200 const unsigned int needed_pio[3] = { 201 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 202 }; 203 int pio = needed_pio[mwdma] - XFER_PIO_0; 204 205 control = 3; /* IORDY|TIME1 */ 206 207 /* If the drive MWDMA is faster than it can do PIO then 208 we must force PIO into PIO0 */ 209 210 if (adev->pio_mode < needed_pio[mwdma]) 211 /* Enable DMA timing only */ 212 control |= 8; /* PIO cycles in PIO0 */ 213 214 if (adev->devno) { /* Slave */ 215 master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */ 216 master_data |= control << 4; 217 pci_read_config_byte(dev, 0x44, &slave_data); 218 slave_data &= ap->port_no ? 0x0F : 0xF0; 219 /* Load the matching timing */ 220 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); 221 pci_write_config_byte(dev, 0x44, slave_data); 222 } else { /* Master */ 223 master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY 224 and master timing bits */ 225 master_data |= control; 226 master_data |= 227 (timings[pio][0] << 12) | 228 (timings[pio][1] << 8); 229 } 230 udma_enable &= ~(1 << devid); 231 pci_write_config_word(dev, master_port, master_data); 232 } 233 pci_write_config_byte(dev, 0x48, udma_enable); 234 spin_unlock_irqrestore(&efar_lock, flags); 235 } 236 237 static const struct scsi_host_template efar_sht = { 238 ATA_BMDMA_SHT(DRV_NAME), 239 }; 240 241 static struct ata_port_operations efar_ops = { 242 .inherits = &ata_bmdma_port_ops, 243 .cable_detect = efar_cable_detect, 244 .set_piomode = efar_set_piomode, 245 .set_dmamode = efar_set_dmamode, 246 .prereset = efar_pre_reset, 247 }; 248 249 250 /** 251 * efar_init_one - Register EFAR ATA PCI device with kernel services 252 * @pdev: PCI device to register 253 * @ent: Entry in efar_pci_tbl matching with @pdev 254 * 255 * Called from kernel PCI layer. 256 * 257 * LOCKING: 258 * Inherited from PCI layer (may sleep). 259 * 260 * RETURNS: 261 * Zero on success, or -ERRNO value. 262 */ 263 264 static int efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) 265 { 266 static const struct ata_port_info info = { 267 .flags = ATA_FLAG_SLAVE_POSS, 268 .pio_mask = ATA_PIO4, 269 .mwdma_mask = ATA_MWDMA12_ONLY, 270 .udma_mask = ATA_UDMA4, 271 .port_ops = &efar_ops, 272 }; 273 const struct ata_port_info *ppi[] = { &info, &info }; 274 275 ata_print_version_once(&pdev->dev, DRV_VERSION); 276 277 return ata_pci_bmdma_init_one(pdev, ppi, &efar_sht, NULL, 278 ATA_HOST_PARALLEL_SCAN); 279 } 280 281 static const struct pci_device_id efar_pci_tbl[] = { 282 { PCI_VDEVICE(EFAR, 0x9130), }, 283 284 { } /* terminate list */ 285 }; 286 287 static struct pci_driver efar_pci_driver = { 288 .name = DRV_NAME, 289 .id_table = efar_pci_tbl, 290 .probe = efar_init_one, 291 .remove = ata_pci_remove_one, 292 #ifdef CONFIG_PM_SLEEP 293 .suspend = ata_pci_device_suspend, 294 .resume = ata_pci_device_resume, 295 #endif 296 }; 297 298 module_pci_driver(efar_pci_driver); 299 300 MODULE_AUTHOR("Alan Cox"); 301 MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones"); 302 MODULE_LICENSE("GPL"); 303 MODULE_DEVICE_TABLE(pci, efar_pci_tbl); 304 MODULE_VERSION(DRV_VERSION); 305