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Alan Coxc4b5b7b2007-09-29 02:35:10 -04001/*
2 * pata_ns87415.c - NS87415 (non PARISC) PATA
3 *
4 * (C) 2005 Red Hat <alan@redhat.com>
5 *
6 * This is a fairly generic MWDMA controller. It has some limitations
7 * as it requires timing reloads on PIO/DMA transitions but it is otherwise
8 * fairly well designed.
9 *
10 * This driver assumes the firmware has left the chip in a valid ST506
11 * compliant state, either legacy IRQ 14/15 or native INTA shared. You
12 * may need to add platform code if your system fails to do this.
13 *
14 * The same cell appears in the 87560 controller used by some PARISC
15 * systems. This has its own special mountain of errata.
16 *
17 * TODO:
18 * Test PARISC SuperIO
19 * Get someone to test on SPARC
20 * Implement lazy pio/dma switching for better performance
21 * 8bit shared timing.
22 * See if we need to kill the FIFO for ATAPI
23 */
24
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/pci.h>
28#include <linux/init.h>
29#include <linux/blkdev.h>
30#include <linux/delay.h>
31#include <linux/device.h>
32#include <scsi/scsi_host.h>
33#include <linux/libata.h>
34#include <linux/ata.h>
35
36#define DRV_NAME "pata_ns87415"
37#define DRV_VERSION "0.0.1"
38
39/**
40 * ns87415_set_mode - Initialize host controller mode timings
41 * @ap: Port whose timings we are configuring
42 * @adev: Device whose timings we are configuring
43 * @mode: Mode to set
44 *
45 * Program the mode registers for this controller, channel and
46 * device. Because the chip is quite an old design we have to do this
47 * for PIO/DMA switches.
48 *
49 * LOCKING:
50 * None (inherited from caller).
51 */
52
53static void ns87415_set_mode(struct ata_port *ap, struct ata_device *adev, u8 mode)
54{
55 struct pci_dev *dev = to_pci_dev(ap->host->dev);
56 int unit = 2 * ap->port_no + adev->devno;
57 int timing = 0x44 + 2 * unit;
58 unsigned long T = 1000000000 / 33333; /* PCI clocks */
59 struct ata_timing t;
60 u16 clocking;
61 u8 iordy;
62 u8 status;
63
64 /* Timing register format is 17 - low nybble read timing with
65 the high nybble being 16 - x for recovery time in PCI clocks */
66
67 ata_timing_compute(adev, adev->pio_mode, &t, T, 0);
68
69 clocking = 17 - FIT(t.active, 2, 17);
70 clocking |= (16 - FIT(t.recover, 1, 16)) << 4;
71 /* Use the same timing for read and write bytes */
72 clocking |= (clocking << 8);
73 pci_write_config_word(dev, timing, clocking);
74
75 /* Set the IORDY enable versus DMA enable on or off properly */
76 pci_read_config_byte(dev, 0x42, &iordy);
77 iordy &= ~(1 << (4 + unit));
78 if (mode >= XFER_MW_DMA_0 || !ata_pio_need_iordy(adev))
79 iordy |= (1 << (4 + unit));
80
81 /* Paranoia: We shouldn't ever get here with busy write buffers
82 but if so wait */
83
84 pci_read_config_byte(dev, 0x43, &status);
85 while (status & 0x03) {
86 udelay(1);
87 pci_read_config_byte(dev, 0x43, &status);
88 }
89 /* Flip the IORDY/DMA bits now we are sure the write buffers are
90 clear */
91 pci_write_config_byte(dev, 0x42, iordy);
92
93 /* TODO: Set byte 54 command timing to the best 8bit
94 mode shared by all four devices */
95}
96
97/**
98 * ns87415_set_piomode - Initialize host controller PATA PIO timings
99 * @ap: Port whose timings we are configuring
100 * @adev: Device to program
101 *
102 * Set PIO mode for device, in host controller PCI config space.
103 *
104 * LOCKING:
105 * None (inherited from caller).
106 */
107
108static void ns87415_set_piomode(struct ata_port *ap, struct ata_device *adev)
109{
110 ns87415_set_mode(ap, adev, adev->pio_mode);
111}
112
113/**
114 * ns87415_bmdma_setup - Set up DMA
115 * @qc: Command block
116 *
117 * Set up for bus masterng DMA. We have to do this ourselves
118 * rather than use the helper due to a chip erratum
119 */
120
121static void ns87415_bmdma_setup(struct ata_queued_cmd *qc)
122{
123 struct ata_port *ap = qc->ap;
124 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
125 u8 dmactl;
126
127 /* load PRD table addr. */
128 mb(); /* make sure PRD table writes are visible to controller */
129 iowrite32(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
130
131 /* specify data direction, triple-check start bit is clear */
132 dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
133 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
134 /* Due to an erratum we need to write these bits to the wrong
135 place - which does save us an I/O bizarrely */
136 dmactl |= ATA_DMA_INTR | ATA_DMA_ERR;
137 if (!rw)
138 dmactl |= ATA_DMA_WR;
139 iowrite8(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
140 /* issue r/w command */
141 ap->ops->exec_command(ap, &qc->tf);
142}
143
144/**
145 * ns87415_bmdma_start - Begin DMA transfer
146 * @qc: Command block
147 *
148 * Switch the timings for the chip and set up for a DMA transfer
149 * before the DMA burst begins.
150 *
151 * FIXME: We should do lazy switching on bmdma_start versus
152 * ata_pio_data_xfer for better performance.
153 */
154
155static void ns87415_bmdma_start(struct ata_queued_cmd *qc)
156{
157 ns87415_set_mode(qc->ap, qc->dev, qc->dev->dma_mode);
158 ata_bmdma_start(qc);
159}
160
161/**
162 * ns87415_bmdma_stop - End DMA transfer
163 * @qc: Command block
164 *
165 * End DMA mode and switch the controller back into PIO mode
166 */
167
168static void ns87415_bmdma_stop(struct ata_queued_cmd *qc)
169{
170 ata_bmdma_stop(qc);
171 ns87415_set_mode(qc->ap, qc->dev, qc->dev->pio_mode);
172}
173
174/**
175 * ns87415_bmdma_irq_clear - Clear interrupt
176 * @ap: Channel to clear
177 *
178 * Erratum: Due to a chip bug regisers 02 and 0A bit 1 and 2 (the
179 * error bits) are reset by writing to register 00 or 08.
180 */
181
182static void ns87415_bmdma_irq_clear(struct ata_port *ap)
183{
184 void __iomem *mmio = ap->ioaddr.bmdma_addr;
185
186 if (!mmio)
187 return;
188 iowrite8((ioread8(mmio + ATA_DMA_CMD) | ATA_DMA_INTR | ATA_DMA_ERR),
189 mmio + ATA_DMA_CMD);
190}
191
192/**
193 * ns87415_check_atapi_dma - ATAPI DMA filter
194 * @qc: Command block
195 *
196 * Disable ATAPI DMA (for now). We may be able to do DMA if we
197 * kill the prefetching. This isn't clear.
198 */
199
200static int ns87415_check_atapi_dma(struct ata_queued_cmd *qc)
201{
202 return -EOPNOTSUPP;
203}
204
205#if defined(CONFIG_SUPERIO)
206
207/* SUPERIO 87560 is a PoS chip that NatSem denies exists.
208 * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
209 * which use the integrated NS87514 cell for CD-ROM support.
210 * i.e we have to support for CD-ROM installs.
211 * See drivers/parisc/superio.c for more gory details.
212 *
213 * Workarounds taken from drivers/ide/pci/ns87415.c
214 */
215
216#include <asm/superio.h>
217
218/**
219 * ns87560_read_buggy - workaround buggy Super I/O chip
220 * @port: Port to read
221 *
222 * Work around chipset problems in the 87560 SuperIO chip
223 */
224
225static u8 ns87560_read_buggy(void __iomem *port)
226{
227 u8 tmp;
228 int retries = SUPERIO_IDE_MAX_RETRIES;
229 do {
230 tmp = ioread8(port);
231 if (tmp != 0)
232 return tmp;
233 udelay(50);
234 } while(retries-- > 0);
235 return tmp;
236}
237
238/**
239 * ns87560_check_status
240 * @ap: channel to check
241 *
242 * Return the status of the channel working around the
243 * 87560 flaws.
244 */
245
246static u8 ns87560_check_status(struct ata_port *ap)
247{
248 return ns87560_read_buggy(ap->ioaddr.status_addr);
249}
250
251/**
252 * ns87560_tf_read - input device's ATA taskfile shadow registers
253 * @ap: Port from which input is read
254 * @tf: ATA taskfile register set for storing input
255 *
256 * Reads ATA taskfile registers for currently-selected device
257 * into @tf. Work around the 87560 bugs.
258 *
259 * LOCKING:
260 * Inherited from caller.
261 */
262void ns87560_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
263{
264 struct ata_ioports *ioaddr = &ap->ioaddr;
265
266 tf->command = ns87560_check_status(ap);
267 tf->feature = ioread8(ioaddr->error_addr);
268 tf->nsect = ioread8(ioaddr->nsect_addr);
269 tf->lbal = ioread8(ioaddr->lbal_addr);
270 tf->lbam = ioread8(ioaddr->lbam_addr);
271 tf->lbah = ioread8(ioaddr->lbah_addr);
272 tf->device = ns87560_read_buggy(ioaddr->device_addr);
273
274 if (tf->flags & ATA_TFLAG_LBA48) {
275 iowrite8(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
276 tf->hob_feature = ioread8(ioaddr->error_addr);
277 tf->hob_nsect = ioread8(ioaddr->nsect_addr);
278 tf->hob_lbal = ioread8(ioaddr->lbal_addr);
279 tf->hob_lbam = ioread8(ioaddr->lbam_addr);
280 tf->hob_lbah = ioread8(ioaddr->lbah_addr);
281 iowrite8(tf->ctl, ioaddr->ctl_addr);
282 ap->last_ctl = tf->ctl;
283 }
284}
285
286/**
287 * ns87560_bmdma_status
288 * @ap: channel to check
289 *
290 * Return the DMA status of the channel working around the
291 * 87560 flaws.
292 */
293
294static u8 ns87560_bmdma_status(struct ata_port *ap)
295{
296 return ns87560_read_buggy(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
297}
298
299static const struct ata_port_operations ns87560_pata_ops = {
300 .set_piomode = ns87415_set_piomode,
301 .mode_filter = ata_pci_default_filter,
302
303 .tf_load = ata_tf_load,
304 .tf_read = ns87560_tf_read,
305 .check_status = ns87560_check_status,
306 .check_atapi_dma = ns87415_check_atapi_dma,
307 .exec_command = ata_exec_command,
308 .dev_select = ata_std_dev_select,
309
310 .freeze = ata_bmdma_freeze,
311 .thaw = ata_bmdma_thaw,
312 .error_handler = ata_bmdma_error_handler,
313 .post_internal_cmd = ata_bmdma_post_internal_cmd,
314 .cable_detect = ata_cable_40wire,
315
316 .bmdma_setup = ns87415_bmdma_setup,
317 .bmdma_start = ns87415_bmdma_start,
318 .bmdma_stop = ns87415_bmdma_stop,
319 .bmdma_status = ns87560_bmdma_status,
320 .qc_prep = ata_qc_prep,
321 .qc_issue = ata_qc_issue_prot,
322 .data_xfer = ata_data_xfer,
323
324 .irq_handler = ata_interrupt,
325 .irq_clear = ns87415_bmdma_irq_clear,
326 .irq_on = ata_irq_on,
327
328 .port_start = ata_sff_port_start,
329};
330
331#endif /* 87560 SuperIO Support */
332
333
334static const struct ata_port_operations ns87415_pata_ops = {
335 .set_piomode = ns87415_set_piomode,
336 .mode_filter = ata_pci_default_filter,
337
338 .tf_load = ata_tf_load,
339 .tf_read = ata_tf_read,
340 .check_status = ata_check_status,
341 .check_atapi_dma = ns87415_check_atapi_dma,
342 .exec_command = ata_exec_command,
343 .dev_select = ata_std_dev_select,
344
345 .freeze = ata_bmdma_freeze,
346 .thaw = ata_bmdma_thaw,
347 .error_handler = ata_bmdma_error_handler,
348 .post_internal_cmd = ata_bmdma_post_internal_cmd,
349 .cable_detect = ata_cable_40wire,
350
351 .bmdma_setup = ns87415_bmdma_setup,
352 .bmdma_start = ns87415_bmdma_start,
353 .bmdma_stop = ns87415_bmdma_stop,
354 .bmdma_status = ata_bmdma_status,
355 .qc_prep = ata_qc_prep,
356 .qc_issue = ata_qc_issue_prot,
357 .data_xfer = ata_data_xfer,
358
359 .irq_handler = ata_interrupt,
360 .irq_clear = ns87415_bmdma_irq_clear,
361 .irq_on = ata_irq_on,
362
363 .port_start = ata_sff_port_start,
364};
365
366static struct scsi_host_template ns87415_sht = {
367 .module = THIS_MODULE,
368 .name = DRV_NAME,
369 .ioctl = ata_scsi_ioctl,
370 .queuecommand = ata_scsi_queuecmd,
371 .can_queue = ATA_DEF_QUEUE,
372 .this_id = ATA_SHT_THIS_ID,
373 .sg_tablesize = LIBATA_MAX_PRD,
374 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
375 .emulated = ATA_SHT_EMULATED,
376 .use_clustering = ATA_SHT_USE_CLUSTERING,
377 .proc_name = DRV_NAME,
378 .dma_boundary = ATA_DMA_BOUNDARY,
379 .slave_configure = ata_scsi_slave_config,
380 .slave_destroy = ata_scsi_slave_destroy,
381 .bios_param = ata_std_bios_param,
382};
383
384
385/**
386 * ns87415_init_one - Register 87415 ATA PCI device with kernel services
387 * @pdev: PCI device to register
388 * @ent: Entry in ns87415_pci_tbl matching with @pdev
389 *
390 * Called from kernel PCI layer. We probe for combined mode (sigh),
391 * and then hand over control to libata, for it to do the rest.
392 *
393 * LOCKING:
394 * Inherited from PCI layer (may sleep).
395 *
396 * RETURNS:
397 * Zero on success, or -ERRNO value.
398 */
399
400static int ns87415_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
401{
402 static int printed_version;
403 static const struct ata_port_info info = {
404 .sht = &ns87415_sht,
405 .flags = ATA_FLAG_SLAVE_POSS,
406 .pio_mask = 0x1f, /* pio0-4 */
407 .mwdma_mask = 0x07, /* mwdma0-2 */
408 .port_ops = &ns87415_pata_ops,
409 };
410 const struct ata_port_info *ppi[] = { &info, NULL };
411#if defined(CONFIG_SUPERIO)
412 static const struct ata_port_info info87560 = {
413 .sht = &ns87415_sht,
414 .flags = ATA_FLAG_SLAVE_POSS,
415 .pio_mask = 0x1f, /* pio0-4 */
416 .mwdma_mask = 0x07, /* mwdma0-2 */
417 .port_ops = &ns87560_pata_ops,
418 };
419
420 if (PCI_SLOT(pdev->devfn) == 0x0E)
421 ppi[0] = &info87560;
422#endif
423 if (!printed_version++)
424 dev_printk(KERN_DEBUG, &pdev->dev,
425 "version " DRV_VERSION "\n");
426 /* Select 512 byte sectors */
427 pci_write_config_byte(pdev, 0x55, 0xEE);
428 /* Select PIO0 8bit clocking */
429 pci_write_config_byte(pdev, 0x54, 0xB7);
430 return ata_pci_init_one(pdev, ppi);
431}
432
433static const struct pci_device_id ns87415_pci_tbl[] = {
434 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), },
435
436 { } /* terminate list */
437};
438
439static struct pci_driver ns87415_pci_driver = {
440 .name = DRV_NAME,
441 .id_table = ns87415_pci_tbl,
442 .probe = ns87415_init_one,
443 .remove = ata_pci_remove_one,
444#ifdef CONFIG_PM
445 .suspend = ata_pci_device_suspend,
446 .resume = ata_pci_device_resume,
447#endif
448};
449
450static int __init ns87415_init(void)
451{
452 return pci_register_driver(&ns87415_pci_driver);
453}
454
455static void __exit ns87415_exit(void)
456{
457 pci_unregister_driver(&ns87415_pci_driver);
458}
459
460module_init(ns87415_init);
461module_exit(ns87415_exit);
462
463MODULE_AUTHOR("Alan Cox");
464MODULE_DESCRIPTION("ATA low-level driver for NS87415 controllers");
465MODULE_LICENSE("GPL");
466MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
467MODULE_VERSION(DRV_VERSION);