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