1/* 2 * pata_qdi.c - QDI VLB ATA controllers 3 * (C) 2006 Red Hat 4 * 5 * This driver mostly exists as a proof of concept for non PCI devices under 6 * libata. While the QDI6580 was 'neat' in 1993 it is no longer terribly 7 * useful. 8 * 9 * Tuning code written from the documentation at 10 * http://www.ryston.cz/petr/vlb/qd6500.html 11 * http://www.ryston.cz/petr/vlb/qd6580.html 12 * 13 * Probe code based on drivers/ide/legacy/qd65xx.c 14 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by 15 * Samuel Thibault <samuel.thibault@ens-lyon.org> 16 */ 17 18#include <linux/kernel.h> 19#include <linux/module.h> 20#include <linux/pci.h> 21#include <linux/init.h> 22#include <linux/blkdev.h> 23#include <linux/delay.h> 24#include <scsi/scsi_host.h> 25#include <linux/libata.h> 26#include <linux/platform_device.h> 27 28#define DRV_NAME "pata_qdi" 29#define DRV_VERSION "0.3.1" 30 31#define NR_HOST 4 /* Two 6580s */ 32 33struct qdi_data { 34 unsigned long timing; 35 u8 clock[2]; 36 u8 last; 37 int fast; 38 struct platform_device *platform_dev; 39 40}; 41 42static struct ata_host *qdi_host[NR_HOST]; 43static struct qdi_data qdi_data[NR_HOST]; 44static int nr_qdi_host; 45 46#ifdef MODULE 47static int probe_qdi = 1; 48#else 49static int probe_qdi; 50#endif 51 52static void qdi6500_set_piomode(struct ata_port *ap, struct ata_device *adev) 53{ 54 struct ata_timing t; 55 struct qdi_data *qdi = ap->host->private_data; 56 int active, recovery; 57 u8 timing; 58 59 /* Get the timing data in cycles */ 60 ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000); 61 62 if (qdi->fast) { 63 active = 8 - clamp_val(t.active, 1, 8); 64 recovery = 18 - clamp_val(t.recover, 3, 18); 65 } else { 66 active = 9 - clamp_val(t.active, 2, 9); 67 recovery = 15 - clamp_val(t.recover, 0, 15); 68 } 69 timing = (recovery << 4) | active | 0x08; 70 71 qdi->clock[adev->devno] = timing; 72 73 outb(timing, qdi->timing); 74} 75 76static void qdi6580_set_piomode(struct ata_port *ap, struct ata_device *adev) 77{ 78 struct ata_timing t; 79 struct qdi_data *qdi = ap->host->private_data; 80 int active, recovery; 81 u8 timing; 82 83 /* Get the timing data in cycles */ 84 ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000); 85 86 if (qdi->fast) { 87 active = 8 - clamp_val(t.active, 1, 8); 88 recovery = 18 - clamp_val(t.recover, 3, 18); 89 } else { 90 active = 9 - clamp_val(t.active, 2, 9); 91 recovery = 15 - clamp_val(t.recover, 0, 15); 92 } 93 timing = (recovery << 4) | active | 0x08; 94 95 qdi->clock[adev->devno] = timing; 96 97 outb(timing, qdi->timing); 98 99 /* Clear the FIFO */ 100 if (adev->class != ATA_DEV_ATA) 101 outb(0x5F, (qdi->timing & 0xFFF0) + 3); 102} 103 104/** 105 * qdi_qc_issue - command issue 106 * @qc: command pending 107 * 108 * Called when the libata layer is about to issue a command. We wrap 109 * this interface so that we can load the correct ATA timings. 110 */ 111 112static unsigned int qdi_qc_issue(struct ata_queued_cmd *qc) 113{ 114 struct ata_port *ap = qc->ap; 115 struct ata_device *adev = qc->dev; 116 struct qdi_data *qdi = ap->host->private_data; 117 118 if (qdi->clock[adev->devno] != qdi->last) { 119 if (adev->pio_mode) { 120 qdi->last = qdi->clock[adev->devno]; 121 outb(qdi->clock[adev->devno], qdi->timing); 122 } 123 } 124 return ata_sff_qc_issue(qc); 125} 126 127static unsigned int qdi_data_xfer(struct ata_device *dev, unsigned char *buf, 128 unsigned int buflen, int rw) 129{ 130 if (ata_id_has_dword_io(dev->id)) { 131 struct ata_port *ap = dev->link->ap; 132 int slop = buflen & 3; 133 134 if (rw == READ) 135 ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2); 136 else 137 iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2); 138 139 if (unlikely(slop)) { 140 __le32 pad; 141 if (rw == READ) { 142 pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr)); 143 memcpy(buf + buflen - slop, &pad, slop); 144 } else { 145 memcpy(&pad, buf + buflen - slop, slop); 146 iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr); 147 } 148 buflen += 4 - slop; 149 } 150 } else 151 buflen = ata_sff_data_xfer(dev, buf, buflen, rw); 152 153 return buflen; 154} 155 156static struct scsi_host_template qdi_sht = { 157 ATA_PIO_SHT(DRV_NAME), 158}; 159 160static struct ata_port_operations qdi6500_port_ops = { 161 .inherits = &ata_sff_port_ops, 162 .qc_issue = qdi_qc_issue, 163 .sff_data_xfer = qdi_data_xfer, 164 .cable_detect = ata_cable_40wire, 165 .set_piomode = qdi6500_set_piomode, 166}; 167 168static struct ata_port_operations qdi6580_port_ops = { 169 .inherits = &qdi6500_port_ops, 170 .set_piomode = qdi6580_set_piomode, 171}; 172 173/** 174 * qdi_init_one - attach a qdi interface 175 * @type: Type to display 176 * @io: I/O port start 177 * @irq: interrupt line 178 * @fast: True if on a > 33Mhz VLB 179 * 180 * Register an ISA bus IDE interface. Such interfaces are PIO and we 181 * assume do not support IRQ sharing. 182 */ 183 184static __init int qdi_init_one(unsigned long port, int type, unsigned long io, int irq, int fast) 185{ 186 unsigned long ctl = io + 0x206; 187 struct platform_device *pdev; 188 struct ata_host *host; 189 struct ata_port *ap; 190 void __iomem *io_addr, *ctl_addr; 191 int ret; 192 193 /* 194 * Fill in a probe structure first of all 195 */ 196 197 pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0); 198 if (IS_ERR(pdev)) 199 return PTR_ERR(pdev); 200 201 ret = -ENOMEM; 202 io_addr = devm_ioport_map(&pdev->dev, io, 8); 203 ctl_addr = devm_ioport_map(&pdev->dev, ctl, 1); 204 if (!io_addr || !ctl_addr) 205 goto fail; 206 207 ret = -ENOMEM; 208 host = ata_host_alloc(&pdev->dev, 1); 209 if (!host) 210 goto fail; 211 ap = host->ports[0]; 212 213 if (type == 6580) { 214 ap->ops = &qdi6580_port_ops; 215 ap->pio_mask = ATA_PIO4; 216 ap->flags |= ATA_FLAG_SLAVE_POSS; 217 } else { 218 ap->ops = &qdi6500_port_ops; 219 ap->pio_mask = ATA_PIO2; /* Actually PIO3 !IORDY is possible */ 220 ap->flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; 221 } 222 223 ap->ioaddr.cmd_addr = io_addr; 224 ap->ioaddr.altstatus_addr = ctl_addr; 225 ap->ioaddr.ctl_addr = ctl_addr; 226 ata_sff_std_ports(&ap->ioaddr); 227 228 ata_port_desc(ap, "cmd %lx ctl %lx", io, ctl); 229 230 /* 231 * Hook in a private data structure per channel 232 */ 233 ap->private_data = &qdi_data[nr_qdi_host]; 234 235 qdi_data[nr_qdi_host].timing = port; 236 qdi_data[nr_qdi_host].fast = fast; 237 qdi_data[nr_qdi_host].platform_dev = pdev; 238 239 printk(KERN_INFO DRV_NAME": qd%d at 0x%lx.\n", type, io); 240 241 /* activate */ 242 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0, &qdi_sht); 243 if (ret) 244 goto fail; 245 246 qdi_host[nr_qdi_host++] = dev_get_drvdata(&pdev->dev); 247 return 0; 248 249 fail: 250 platform_device_unregister(pdev); 251 return ret; 252} 253 254/** 255 * qdi_init - attach qdi interfaces 256 * 257 * Attach qdi IDE interfaces by scanning the ports it may occupy. 258 */ 259 260static __init int qdi_init(void) 261{ 262 unsigned long flags; 263 static const unsigned long qd_port[2] = { 0x30, 0xB0 }; 264 static const unsigned long ide_port[2] = { 0x170, 0x1F0 }; 265 static const int ide_irq[2] = { 14, 15 }; 266 267 int ct = 0; 268 int i; 269 270 if (probe_qdi == 0) 271 return -ENODEV; 272 273 /* 274 * Check each possible QD65xx base address 275 */ 276 277 for (i = 0; i < 2; i++) { 278 unsigned long port = qd_port[i]; 279 u8 r, res; 280 281 282 if (request_region(port, 2, "pata_qdi")) { 283 /* Check for a card */ 284 local_irq_save(flags); 285 r = inb_p(port); 286 outb_p(0x19, port); 287 res = inb_p(port); 288 outb_p(r, port); 289 local_irq_restore(flags); 290 291 /* Fail */ 292 if (res == 0x19) 293 { 294 release_region(port, 2); 295 continue; 296 } 297 298 /* Passes the presence test */ 299 r = inb_p(port + 1); /* Check port agrees with port set */ 300 if ((r & 2) >> 1 != i) { 301 release_region(port, 2); 302 continue; 303 } 304 305 /* Check card type */ 306 if ((r & 0xF0) == 0xC0) { 307 /* QD6500: single channel */ 308 if (r & 8) { 309 /* Disabled ? */ 310 release_region(port, 2); 311 continue; 312 } 313 if (qdi_init_one(port, 6500, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0) 314 ct++; 315 } 316 if (((r & 0xF0) == 0xA0) || (r & 0xF0) == 0x50) { 317 /* QD6580: dual channel */ 318 if (!request_region(port + 2 , 2, "pata_qdi")) 319 { 320 release_region(port, 2); 321 continue; 322 } 323 res = inb(port + 3); 324 if (res & 1) { 325 /* Single channel mode */ 326 if (qdi_init_one(port, 6580, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0) 327 ct++; 328 } else { 329 /* Dual channel mode */ 330 if (qdi_init_one(port, 6580, 0x1F0, 14, r & 0x04) == 0) 331 ct++; 332 if (qdi_init_one(port + 2, 6580, 0x170, 15, r & 0x04) == 0) 333 ct++; 334 } 335 } 336 } 337 } 338 if (ct != 0) 339 return 0; 340 return -ENODEV; 341} 342 343static __exit void qdi_exit(void) 344{ 345 int i; 346 347 for (i = 0; i < nr_qdi_host; i++) { 348 ata_host_detach(qdi_host[i]); 349 /* Free the control resource. The 6580 dual channel has the resources 350 * claimed as a pair of 2 byte resources so we need no special cases... 351 */ 352 release_region(qdi_data[i].timing, 2); 353 platform_device_unregister(qdi_data[i].platform_dev); 354 } 355} 356 357MODULE_AUTHOR("Alan Cox"); 358MODULE_DESCRIPTION("low-level driver for qdi ATA"); 359MODULE_LICENSE("GPL"); 360MODULE_VERSION(DRV_VERSION); 361 362module_init(qdi_init); 363module_exit(qdi_exit); 364 365module_param(probe_qdi, int, 0); 366