1 /* 2 * pata_radisys.c - Intel PATA/SATA controllers 3 * 4 * (C) 2006 Red Hat <alan@redhat.com> 5 * 6 * Some parts based on ata_piix.c by Jeff Garzik and others. 7 * 8 * A PIIX relative, this device has a single ATA channel and no 9 * slave timings, SITRE or PPE. In that sense it is a close relative 10 * of the original PIIX. It does however support UDMA 33/66 per channel 11 * although no other modes/timings. Also lacking is 32bit I/O on the ATA 12 * port. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/pci.h> 18 #include <linux/init.h> 19 #include <linux/blkdev.h> 20 #include <linux/delay.h> 21 #include <linux/device.h> 22 #include <scsi/scsi_host.h> 23 #include <linux/libata.h> 24 #include <linux/ata.h> 25 26 #define DRV_NAME "pata_radisys" 27 #define DRV_VERSION "0.4.4" 28 29 /** 30 * radisys_set_piomode - Initialize host controller PATA PIO timings 31 * @ap: ATA port 32 * @adev: Device whose timings we are configuring 33 * 34 * Set PIO mode for device, in host controller PCI config space. 35 * 36 * LOCKING: 37 * None (inherited from caller). 38 */ 39 40 static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev) 41 { 42 unsigned int pio = adev->pio_mode - XFER_PIO_0; 43 struct pci_dev *dev = to_pci_dev(ap->host->dev); 44 u16 idetm_data; 45 int control = 0; 46 47 /* 48 * See Intel Document 298600-004 for the timing programing rules 49 * for PIIX/ICH. Note that the early PIIX does not have the slave 50 * timing port at 0x44. The Radisys is a relative of the PIIX 51 * but not the same so be careful. 52 */ 53 54 static const /* ISP RTC */ 55 u8 timings[][2] = { { 0, 0 }, /* Check me */ 56 { 0, 0 }, 57 { 1, 1 }, 58 { 2, 2 }, 59 { 3, 3 }, }; 60 61 if (pio > 0) 62 control |= 1; /* TIME1 enable */ 63 if (ata_pio_need_iordy(adev)) 64 control |= 2; /* IE IORDY */ 65 66 pci_read_config_word(dev, 0x40, &idetm_data); 67 68 /* Enable IE and TIME as appropriate. Clear the other 69 drive timing bits */ 70 idetm_data &= 0xCCCC; 71 idetm_data |= (control << (4 * adev->devno)); 72 idetm_data |= (timings[pio][0] << 12) | 73 (timings[pio][1] << 8); 74 pci_write_config_word(dev, 0x40, idetm_data); 75 76 /* Track which port is configured */ 77 ap->private_data = adev; 78 } 79 80 /** 81 * radisys_set_dmamode - Initialize host controller PATA DMA timings 82 * @ap: Port whose timings we are configuring 83 * @adev: Device to program 84 * @isich: True if the device is an ICH and has IOCFG registers 85 * 86 * Set MWDMA mode for device, in host controller PCI config space. 87 * 88 * LOCKING: 89 * None (inherited from caller). 90 */ 91 92 static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev) 93 { 94 struct pci_dev *dev = to_pci_dev(ap->host->dev); 95 u16 idetm_data; 96 u8 udma_enable; 97 98 static const /* ISP RTC */ 99 u8 timings[][2] = { { 0, 0 }, 100 { 0, 0 }, 101 { 1, 1 }, 102 { 2, 2 }, 103 { 3, 3 }, }; 104 105 /* 106 * MWDMA is driven by the PIO timings. We must also enable 107 * IORDY unconditionally. 108 */ 109 110 pci_read_config_word(dev, 0x40, &idetm_data); 111 pci_read_config_byte(dev, 0x48, &udma_enable); 112 113 if (adev->dma_mode < XFER_UDMA_0) { 114 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; 115 const unsigned int needed_pio[3] = { 116 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 117 }; 118 int pio = needed_pio[mwdma] - XFER_PIO_0; 119 int control = 3; /* IORDY|TIME0 */ 120 121 /* If the drive MWDMA is faster than it can do PIO then 122 we must force PIO0 for PIO cycles. */ 123 124 if (adev->pio_mode < needed_pio[mwdma]) 125 control = 1; 126 127 /* Mask out the relevant control and timing bits we will load. Also 128 clear the other drive TIME register as a precaution */ 129 130 idetm_data &= 0xCCCC; 131 idetm_data |= control << (4 * adev->devno); 132 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); 133 134 udma_enable &= ~(1 << adev->devno); 135 } else { 136 u8 udma_mode; 137 138 /* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */ 139 140 pci_read_config_byte(dev, 0x4A, &udma_mode); 141 142 if (adev->xfer_mode == XFER_UDMA_2) 143 udma_mode &= ~ (1 << adev->devno); 144 else /* UDMA 4 */ 145 udma_mode |= (1 << adev->devno); 146 147 pci_write_config_byte(dev, 0x4A, udma_mode); 148 149 udma_enable |= (1 << adev->devno); 150 } 151 pci_write_config_word(dev, 0x40, idetm_data); 152 pci_write_config_byte(dev, 0x48, udma_enable); 153 154 /* Track which port is configured */ 155 ap->private_data = adev; 156 } 157 158 /** 159 * radisys_qc_issue_prot - command issue 160 * @qc: command pending 161 * 162 * Called when the libata layer is about to issue a command. We wrap 163 * this interface so that we can load the correct ATA timings if 164 * necessary. Our logic also clears TIME0/TIME1 for the other device so 165 * that, even if we get this wrong, cycles to the other device will 166 * be made PIO0. 167 */ 168 169 static unsigned int radisys_qc_issue_prot(struct ata_queued_cmd *qc) 170 { 171 struct ata_port *ap = qc->ap; 172 struct ata_device *adev = qc->dev; 173 174 if (adev != ap->private_data) { 175 /* UDMA timing is not shared */ 176 if (adev->dma_mode < XFER_UDMA_0) { 177 if (adev->dma_mode) 178 radisys_set_dmamode(ap, adev); 179 else if (adev->pio_mode) 180 radisys_set_piomode(ap, adev); 181 } 182 } 183 return ata_qc_issue_prot(qc); 184 } 185 186 187 static struct scsi_host_template radisys_sht = { 188 .module = THIS_MODULE, 189 .name = DRV_NAME, 190 .ioctl = ata_scsi_ioctl, 191 .queuecommand = ata_scsi_queuecmd, 192 .can_queue = ATA_DEF_QUEUE, 193 .this_id = ATA_SHT_THIS_ID, 194 .sg_tablesize = LIBATA_MAX_PRD, 195 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 196 .emulated = ATA_SHT_EMULATED, 197 .use_clustering = ATA_SHT_USE_CLUSTERING, 198 .proc_name = DRV_NAME, 199 .dma_boundary = ATA_DMA_BOUNDARY, 200 .slave_configure = ata_scsi_slave_config, 201 .slave_destroy = ata_scsi_slave_destroy, 202 .bios_param = ata_std_bios_param, 203 }; 204 205 static const struct ata_port_operations radisys_pata_ops = { 206 .set_piomode = radisys_set_piomode, 207 .set_dmamode = radisys_set_dmamode, 208 .mode_filter = ata_pci_default_filter, 209 210 .tf_load = ata_tf_load, 211 .tf_read = ata_tf_read, 212 .check_status = ata_check_status, 213 .exec_command = ata_exec_command, 214 .dev_select = ata_std_dev_select, 215 216 .freeze = ata_bmdma_freeze, 217 .thaw = ata_bmdma_thaw, 218 .error_handler = ata_bmdma_error_handler, 219 .post_internal_cmd = ata_bmdma_post_internal_cmd, 220 .cable_detect = ata_cable_unknown, 221 222 .bmdma_setup = ata_bmdma_setup, 223 .bmdma_start = ata_bmdma_start, 224 .bmdma_stop = ata_bmdma_stop, 225 .bmdma_status = ata_bmdma_status, 226 .qc_prep = ata_qc_prep, 227 .qc_issue = radisys_qc_issue_prot, 228 .data_xfer = ata_data_xfer, 229 230 .irq_handler = ata_interrupt, 231 .irq_clear = ata_bmdma_irq_clear, 232 .irq_on = ata_irq_on, 233 234 .port_start = ata_sff_port_start, 235 }; 236 237 238 /** 239 * radisys_init_one - Register PIIX ATA PCI device with kernel services 240 * @pdev: PCI device to register 241 * @ent: Entry in radisys_pci_tbl matching with @pdev 242 * 243 * Called from kernel PCI layer. We probe for combined mode (sigh), 244 * and then hand over control to libata, for it to do the rest. 245 * 246 * LOCKING: 247 * Inherited from PCI layer (may sleep). 248 * 249 * RETURNS: 250 * Zero on success, or -ERRNO value. 251 */ 252 253 static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) 254 { 255 static int printed_version; 256 static const struct ata_port_info info = { 257 .sht = &radisys_sht, 258 .flags = ATA_FLAG_SLAVE_POSS, 259 .pio_mask = 0x1f, /* pio0-4 */ 260 .mwdma_mask = 0x07, /* mwdma1-2 */ 261 .udma_mask = 0x14, /* UDMA33/66 only */ 262 .port_ops = &radisys_pata_ops, 263 }; 264 const struct ata_port_info *ppi[] = { &info, NULL }; 265 266 if (!printed_version++) 267 dev_printk(KERN_DEBUG, &pdev->dev, 268 "version " DRV_VERSION "\n"); 269 270 return ata_pci_init_one(pdev, ppi); 271 } 272 273 static const struct pci_device_id radisys_pci_tbl[] = { 274 { PCI_VDEVICE(RADISYS, 0x8201), }, 275 276 { } /* terminate list */ 277 }; 278 279 static struct pci_driver radisys_pci_driver = { 280 .name = DRV_NAME, 281 .id_table = radisys_pci_tbl, 282 .probe = radisys_init_one, 283 .remove = ata_pci_remove_one, 284 #ifdef CONFIG_PM 285 .suspend = ata_pci_device_suspend, 286 .resume = ata_pci_device_resume, 287 #endif 288 }; 289 290 static int __init radisys_init(void) 291 { 292 return pci_register_driver(&radisys_pci_driver); 293 } 294 295 static void __exit radisys_exit(void) 296 { 297 pci_unregister_driver(&radisys_pci_driver); 298 } 299 300 module_init(radisys_init); 301 module_exit(radisys_exit); 302 303 MODULE_AUTHOR("Alan Cox"); 304 MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers"); 305 MODULE_LICENSE("GPL"); 306 MODULE_DEVICE_TABLE(pci, radisys_pci_tbl); 307 MODULE_VERSION(DRV_VERSION); 308 309