2 * pata_optidma.c - Opti DMA PATA for new ATA layer
4 * Alan Cox <alan@redhat.com>
6 * The Opti DMA controllers are related to the older PIO PCI controllers
7 * and indeed the VLB ones. The main differences are that the timing
8 * numbers are now based off PCI clocks not VLB and differ, and that
11 * This driver should support Viper-N+, FireStar, FireStar Plus.
13 * These devices support virtual DMA for read (aka the CS5520). Later
14 * chips support UDMA33, but only if the rest of the board logic does,
15 * so you have to get this right. We don't support the virtual DMA
16 * but we do handle UDMA.
18 * Bits that are worth knowing
19 * Most control registers are shadowed into I/O registers
20 * 0x1F5 bit 0 tells you if the PCI/VLB clock is 33 or 25Mhz
21 * Virtual DMA registers *move* between rev 0x02 and rev 0x10
22 * UDMA requires a 66MHz FSB
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/pci.h>
29 #include <linux/init.h>
30 #include <linux/blkdev.h>
31 #include <linux/delay.h>
32 #include <scsi/scsi_host.h>
33 #include <linux/libata.h>
35 #define DRV_NAME "pata_optidma"
36 #define DRV_VERSION "0.3.2"
39 READ_REG = 0, /* index of Read cycle timing register */
40 WRITE_REG = 1, /* index of Write cycle timing register */
41 CNTRL_REG = 3, /* index of Control register */
42 STRAP_REG = 5, /* index of Strap register */
43 MISC_REG = 6 /* index of Miscellaneous register */
46 static int pci_clock; /* 0 = 33 1 = 25 */
49 * optidma_pre_reset - probe begin
51 * @deadline: deadline jiffies for the operation
53 * Set up cable type and use generic probe init
56 static int optidma_pre_reset(struct ata_link *link, unsigned long deadline)
58 struct ata_port *ap = link->ap;
59 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
60 static const struct pci_bits optidma_enable_bits = {
64 if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits))
67 return ata_sff_prereset(link, deadline);
71 * optidma_unlock - unlock control registers
74 * Unlock the control register block for this adapter. Registers must not
75 * be unlocked in a situation where libata might look at them.
78 static void optidma_unlock(struct ata_port *ap)
80 void __iomem *regio = ap->ioaddr.cmd_addr;
82 /* These 3 unlock the control register access */
85 iowrite8(3, regio + 2);
89 * optidma_lock - issue temporary relock
92 * Re-lock the configuration register settings.
95 static void optidma_lock(struct ata_port *ap)
97 void __iomem *regio = ap->ioaddr.cmd_addr;
100 iowrite8(0x83, regio + 2);
104 * optidma_mode_setup - set mode data
109 * Called to do the DMA or PIO mode setup. Timing numbers are all
110 * pre computed to keep the code clean. There are two tables depending
111 * on the hardware clock speed.
113 * WARNING: While we do this the IDE registers vanish. If we take an
114 * IRQ here we depend on the host set locking to avoid catastrophe.
117 static void optidma_mode_setup(struct ata_port *ap, struct ata_device *adev, u8 mode)
119 struct ata_device *pair = ata_dev_pair(adev);
120 int pio = adev->pio_mode - XFER_PIO_0;
121 int dma = adev->dma_mode - XFER_MW_DMA_0;
122 void __iomem *regio = ap->ioaddr.cmd_addr;
125 /* Address table precomputed with a DCLK of 2 */
126 static const u8 addr_timing[2][5] = {
127 { 0x30, 0x20, 0x20, 0x10, 0x10 },
128 { 0x20, 0x20, 0x10, 0x10, 0x10 }
130 static const u8 data_rec_timing[2][5] = {
131 { 0x59, 0x46, 0x30, 0x20, 0x20 },
132 { 0x46, 0x32, 0x20, 0x20, 0x10 }
134 static const u8 dma_data_rec_timing[2][3] = {
135 { 0x76, 0x20, 0x20 },
139 /* Switch from IDE to control mode */
144 * As with many controllers the address setup time is shared
145 * and must suit both devices if present. FIXME: Check if we
146 * need to look at slowest of PIO/DMA mode of either device
149 if (mode >= XFER_MW_DMA_0)
152 addr = addr_timing[pci_clock][pio];
156 /* Hardware constraint */
160 pair_addr = addr_timing[pci_clock][pair->pio_mode - XFER_PIO_0];
161 if (pair_addr > addr)
165 /* Commence primary programming sequence */
166 /* First we load the device number into the timing select */
167 iowrite8(adev->devno, regio + MISC_REG);
168 /* Now we load the data timings into read data/write data */
169 if (mode < XFER_MW_DMA_0) {
170 iowrite8(data_rec_timing[pci_clock][pio], regio + READ_REG);
171 iowrite8(data_rec_timing[pci_clock][pio], regio + WRITE_REG);
172 } else if (mode < XFER_UDMA_0) {
173 iowrite8(dma_data_rec_timing[pci_clock][dma], regio + READ_REG);
174 iowrite8(dma_data_rec_timing[pci_clock][dma], regio + WRITE_REG);
176 /* Finally we load the address setup into the misc register */
177 iowrite8(addr | adev->devno, regio + MISC_REG);
179 /* Programming sequence complete, timing 0 dev 0, timing 1 dev 1 */
180 iowrite8(0x85, regio + CNTRL_REG);
182 /* Switch back to IDE mode */
185 /* Note: at this point our programming is incomplete. We are
186 not supposed to program PCI 0x43 "things we hacked onto the chip"
187 until we've done both sets of PIO/DMA timings */
191 * optiplus_mode_setup - DMA setup for Firestar Plus
194 * @mode: desired mode
196 * The Firestar plus has additional UDMA functionality for UDMA0-2 and
197 * requires we do some additional work. Because the base work we must do
198 * is mostly shared we wrap the Firestar setup functionality in this
202 static void optiplus_mode_setup(struct ata_port *ap, struct ata_device *adev, u8 mode)
204 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
207 int dev2 = 2 * adev->devno;
208 int unit = 2 * ap->port_no + adev->devno;
209 int udma = mode - XFER_UDMA_0;
211 pci_read_config_byte(pdev, 0x44, &udcfg);
212 if (mode <= XFER_UDMA_0) {
213 udcfg &= ~(1 << unit);
214 optidma_mode_setup(ap, adev, adev->dma_mode);
216 udcfg |= (1 << unit);
218 pci_read_config_byte(pdev, 0x45, &udslave);
219 udslave &= ~(0x03 << dev2);
220 udslave |= (udma << dev2);
221 pci_write_config_byte(pdev, 0x45, udslave);
223 udcfg &= ~(0x30 << dev2);
224 udcfg |= (udma << dev2);
227 pci_write_config_byte(pdev, 0x44, udcfg);
231 * optidma_set_pio_mode - PIO setup callback
235 * The libata core provides separate functions for handling PIO and
236 * DMA programming. The architecture of the Firestar makes it easier
237 * for us to have a common function so we provide wrappers
240 static void optidma_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
242 optidma_mode_setup(ap, adev, adev->pio_mode);
246 * optidma_set_dma_mode - DMA setup callback
250 * The libata core provides separate functions for handling PIO and
251 * DMA programming. The architecture of the Firestar makes it easier
252 * for us to have a common function so we provide wrappers
255 static void optidma_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
257 optidma_mode_setup(ap, adev, adev->dma_mode);
261 * optiplus_set_pio_mode - PIO setup callback
265 * The libata core provides separate functions for handling PIO and
266 * DMA programming. The architecture of the Firestar makes it easier
267 * for us to have a common function so we provide wrappers
270 static void optiplus_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
272 optiplus_mode_setup(ap, adev, adev->pio_mode);
276 * optiplus_set_dma_mode - DMA setup callback
280 * The libata core provides separate functions for handling PIO and
281 * DMA programming. The architecture of the Firestar makes it easier
282 * for us to have a common function so we provide wrappers
285 static void optiplus_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
287 optiplus_mode_setup(ap, adev, adev->dma_mode);
291 * optidma_make_bits - PCI setup helper
294 * Turn the ATA device setup into PCI configuration bits
295 * for register 0x43 and return the two bits needed.
298 static u8 optidma_make_bits43(struct ata_device *adev)
300 static const u8 bits43[5] = {
303 if (!ata_dev_enabled(adev))
306 return adev->dma_mode - XFER_MW_DMA_0;
307 return bits43[adev->pio_mode - XFER_PIO_0];
311 * optidma_set_mode - mode setup
312 * @link: link to set up
314 * Use the standard setup to tune the chipset and then finalise the
315 * configuration by writing the nibble of extra bits of data into
319 static int optidma_set_mode(struct ata_link *link, struct ata_device **r_failed)
321 struct ata_port *ap = link->ap;
323 int nybble = 4 * ap->port_no;
324 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
325 int rc = ata_do_set_mode(link, r_failed);
327 pci_read_config_byte(pdev, 0x43, &r);
329 r &= (0x0F << nybble);
330 r |= (optidma_make_bits43(&link->device[0]) +
331 (optidma_make_bits43(&link->device[0]) << 2)) << nybble;
332 pci_write_config_byte(pdev, 0x43, r);
337 static struct scsi_host_template optidma_sht = {
338 ATA_BMDMA_SHT(DRV_NAME),
341 static struct ata_port_operations optidma_port_ops = {
342 .inherits = &ata_bmdma_port_ops,
343 .cable_detect = ata_cable_40wire,
344 .set_piomode = optidma_set_pio_mode,
345 .set_dmamode = optidma_set_dma_mode,
346 .set_mode = optidma_set_mode,
347 .prereset = optidma_pre_reset,
350 static struct ata_port_operations optiplus_port_ops = {
351 .inherits = &optidma_port_ops,
352 .set_piomode = optiplus_set_pio_mode,
353 .set_dmamode = optiplus_set_dma_mode,
357 * optiplus_with_udma - Look for UDMA capable setup
358 * @pdev; ATA controller
361 static int optiplus_with_udma(struct pci_dev *pdev)
366 struct pci_dev *dev1;
368 /* Find function 1 */
369 dev1 = pci_get_device(0x1045, 0xC701, NULL);
373 /* Rev must be >= 0x10 */
374 pci_read_config_byte(dev1, 0x08, &r);
377 /* Read the chipset system configuration to check our mode */
378 pci_read_config_byte(dev1, 0x5F, &r);
381 /* Must be 66Mhz sync */
382 if ((inb(ioport + 2) & 1) == 0)
385 /* Check the ATA arbitration/timing is suitable */
386 pci_read_config_byte(pdev, 0x42, &r);
387 if ((r & 0x36) != 0x36)
389 pci_read_config_byte(dev1, 0x52, &r);
390 if (r & 0x80) /* IDEDIR disabled */
393 printk(KERN_WARNING "UDMA not supported in this configuration.\n");
394 done_nomsg: /* Wrong chip revision */
399 static int optidma_init_one(struct pci_dev *dev, const struct pci_device_id *id)
401 static const struct ata_port_info info_82c700 = {
402 .flags = ATA_FLAG_SLAVE_POSS,
405 .port_ops = &optidma_port_ops
407 static const struct ata_port_info info_82c700_udma = {
408 .flags = ATA_FLAG_SLAVE_POSS,
412 .port_ops = &optiplus_port_ops
414 const struct ata_port_info *ppi[] = { &info_82c700, NULL };
415 static int printed_version;
418 if (!printed_version++)
419 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
421 rc = pcim_enable_device(dev);
425 /* Fixed location chipset magic */
428 pci_clock = inb(0x1F5) & 1; /* 0 = 33Mhz, 1 = 25Mhz */
430 if (optiplus_with_udma(dev))
431 ppi[0] = &info_82c700_udma;
433 return ata_pci_sff_init_one(dev, ppi, &optidma_sht, NULL);
436 static const struct pci_device_id optidma[] = {
437 { PCI_VDEVICE(OPTI, 0xD568), }, /* Opti 82C700 */
442 static struct pci_driver optidma_pci_driver = {
445 .probe = optidma_init_one,
446 .remove = ata_pci_remove_one,
448 .suspend = ata_pci_device_suspend,
449 .resume = ata_pci_device_resume,
453 static int __init optidma_init(void)
455 return pci_register_driver(&optidma_pci_driver);
458 static void __exit optidma_exit(void)
460 pci_unregister_driver(&optidma_pci_driver);
463 MODULE_AUTHOR("Alan Cox");
464 MODULE_DESCRIPTION("low-level driver for Opti Firestar/Firestar Plus");
465 MODULE_LICENSE("GPL");
466 MODULE_DEVICE_TABLE(pci, optidma);
467 MODULE_VERSION(DRV_VERSION);
469 module_init(optidma_init);
470 module_exit(optidma_exit);