xref: /openbmc/linux/drivers/ata/pata_sil680.c (revision 25df73d9)
1 /*
2  * pata_sil680.c 	- SIL680 PATA for new ATA layer
3  *			  (C) 2005 Red Hat Inc
4  *
5  * based upon
6  *
7  * linux/drivers/ide/pci/siimage.c		Version 1.07	Nov 30, 2003
8  *
9  * Copyright (C) 2001-2002	Andre Hedrick <andre@linux-ide.org>
10  * Copyright (C) 2003		Red Hat <alan@redhat.com>
11  *
12  *  May be copied or modified under the terms of the GNU General Public License
13  *
14  *  Documentation publicly available.
15  *
16  *	If you have strange problems with nVidia chipset systems please
17  *	see the SI support documentation and update your system BIOS
18  *	if necessary
19  *
20  * TODO
21  *	If we know all our devices are LBA28 (or LBA28 sized)  we could use
22  *	the command fifo mode.
23  */
24 
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/pci.h>
28 #include <linux/blkdev.h>
29 #include <linux/delay.h>
30 #include <scsi/scsi_host.h>
31 #include <linux/libata.h>
32 
33 #define DRV_NAME "pata_sil680"
34 #define DRV_VERSION "0.4.9"
35 
36 #define SIL680_MMIO_BAR		5
37 
38 /**
39  *	sil680_selreg		-	return register base
40  *	@ap: ATA interface
41  *	@r: config offset
42  *
43  *	Turn a config register offset into the right address in PCI space
44  *	to access the control register in question.
45  *
46  *	Thankfully this is a configuration operation so isn't performance
47  *	criticial.
48  */
49 
sil680_selreg(struct ata_port * ap,int r)50 static int sil680_selreg(struct ata_port *ap, int r)
51 {
52 	return 0xA0 + (ap->port_no << 4) + r;
53 }
54 
55 /**
56  *	sil680_seldev		-	return register base
57  *	@ap: ATA interface
58  *	@adev: ATA device
59  *	@r: config offset
60  *
61  *	Turn a config register offset into the right address in PCI space
62  *	to access the control register in question including accounting for
63  *	the unit shift.
64  */
65 
sil680_seldev(struct ata_port * ap,struct ata_device * adev,int r)66 static int sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
67 {
68 	return 0xA0 + (ap->port_no << 4) + r + (adev->devno << 1);
69 }
70 
71 
72 /**
73  *	sil680_cable_detect	-	cable detection
74  *	@ap: ATA port
75  *
76  *	Perform cable detection. The SIL680 stores this in PCI config
77  *	space for us.
78  */
79 
sil680_cable_detect(struct ata_port * ap)80 static int sil680_cable_detect(struct ata_port *ap)
81 {
82 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
83 	int addr = sil680_selreg(ap, 0);
84 	u8 ata66;
85 
86 	pci_read_config_byte(pdev, addr, &ata66);
87 	if (ata66 & 1)
88 		return ATA_CBL_PATA80;
89 	else
90 		return ATA_CBL_PATA40;
91 }
92 
93 /**
94  *	sil680_set_piomode	-	set PIO mode data
95  *	@ap: ATA interface
96  *	@adev: ATA device
97  *
98  *	Program the SIL680 registers for PIO mode. Note that the task speed
99  *	registers are shared between the devices so we must pick the lowest
100  *	mode for command work.
101  */
102 
sil680_set_piomode(struct ata_port * ap,struct ata_device * adev)103 static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
104 {
105 	static const u16 speed_p[5] = {
106 		0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1
107 	};
108 	static const u16 speed_t[5] = {
109 		0x328A, 0x2283, 0x1281, 0x10C3, 0x10C1
110 	};
111 
112 	int tfaddr = sil680_selreg(ap, 0x02);
113 	int addr = sil680_seldev(ap, adev, 0x04);
114 	int addr_mask = 0x80 + 4 * ap->port_no;
115 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
116 	int pio = adev->pio_mode - XFER_PIO_0;
117 	int lowest_pio = pio;
118 	int port_shift = 4 * adev->devno;
119 	u16 reg;
120 	u8 mode;
121 
122 	struct ata_device *pair = ata_dev_pair(adev);
123 
124 	if (pair != NULL && adev->pio_mode > pair->pio_mode)
125 		lowest_pio = pair->pio_mode - XFER_PIO_0;
126 
127 	pci_write_config_word(pdev, addr, speed_p[pio]);
128 	pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
129 
130 	pci_read_config_word(pdev, tfaddr-2, &reg);
131 	pci_read_config_byte(pdev, addr_mask, &mode);
132 
133 	reg &= ~0x0200;			/* Clear IORDY */
134 	mode &= ~(3 << port_shift);	/* Clear IORDY and DMA bits */
135 
136 	if (ata_pio_need_iordy(adev)) {
137 		reg |= 0x0200;		/* Enable IORDY */
138 		mode |= 1 << port_shift;
139 	}
140 	pci_write_config_word(pdev, tfaddr-2, reg);
141 	pci_write_config_byte(pdev, addr_mask, mode);
142 }
143 
144 /**
145  *	sil680_set_dmamode	-	set DMA mode data
146  *	@ap: ATA interface
147  *	@adev: ATA device
148  *
149  *	Program the MWDMA/UDMA modes for the sil680 chipset.
150  *
151  *	The MWDMA mode values are pulled from a lookup table
152  *	while the chipset uses mode number for UDMA.
153  */
154 
sil680_set_dmamode(struct ata_port * ap,struct ata_device * adev)155 static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
156 {
157 	static const u8 ultra_table[2][7] = {
158 		{ 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF },	/* 100MHz */
159 		{ 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 },	/* 133Mhz */
160 	};
161 	static const u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };
162 
163 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
164 	int ma = sil680_seldev(ap, adev, 0x08);
165 	int ua = sil680_seldev(ap, adev, 0x0C);
166 	int addr_mask = 0x80 + 4 * ap->port_no;
167 	int port_shift = adev->devno * 4;
168 	u8 scsc, mode;
169 	u16 multi, ultra;
170 
171 	pci_read_config_byte(pdev, 0x8A, &scsc);
172 	pci_read_config_byte(pdev, addr_mask, &mode);
173 	pci_read_config_word(pdev, ma, &multi);
174 	pci_read_config_word(pdev, ua, &ultra);
175 
176 	/* Mask timing bits */
177 	ultra &= ~0x3F;
178 	mode &= ~(0x03 << port_shift);
179 
180 	/* Extract scsc */
181 	scsc = (scsc & 0x30) ? 1 : 0;
182 
183 	if (adev->dma_mode >= XFER_UDMA_0) {
184 		multi = 0x10C1;
185 		ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
186 		mode |= (0x03 << port_shift);
187 	} else {
188 		multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
189 		mode |= (0x02 << port_shift);
190 	}
191 	pci_write_config_byte(pdev, addr_mask, mode);
192 	pci_write_config_word(pdev, ma, multi);
193 	pci_write_config_word(pdev, ua, ultra);
194 }
195 
196 /**
197  *	sil680_sff_exec_command - issue ATA command to host controller
198  *	@ap: port to which command is being issued
199  *	@tf: ATA taskfile register set
200  *
201  *	Issues ATA command, with proper synchronization with interrupt
202  *	handler / other threads. Use our MMIO space for PCI posting to avoid
203  *	a hideously slow cycle all the way to the device.
204  *
205  *	LOCKING:
206  *	spin_lock_irqsave(host lock)
207  */
sil680_sff_exec_command(struct ata_port * ap,const struct ata_taskfile * tf)208 static void sil680_sff_exec_command(struct ata_port *ap,
209 				    const struct ata_taskfile *tf)
210 {
211 	iowrite8(tf->command, ap->ioaddr.command_addr);
212 	ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
213 }
214 
sil680_sff_irq_check(struct ata_port * ap)215 static bool sil680_sff_irq_check(struct ata_port *ap)
216 {
217 	struct pci_dev *pdev	= to_pci_dev(ap->host->dev);
218 	int addr		= sil680_selreg(ap, 1);
219 	u8 val;
220 
221 	pci_read_config_byte(pdev, addr, &val);
222 
223 	return val & 0x08;
224 }
225 
226 static const struct scsi_host_template sil680_sht = {
227 	ATA_BMDMA_SHT(DRV_NAME),
228 };
229 
230 
231 static struct ata_port_operations sil680_port_ops = {
232 	.inherits		= &ata_bmdma32_port_ops,
233 	.sff_exec_command	= sil680_sff_exec_command,
234 	.sff_irq_check		= sil680_sff_irq_check,
235 	.cable_detect		= sil680_cable_detect,
236 	.set_piomode		= sil680_set_piomode,
237 	.set_dmamode		= sil680_set_dmamode,
238 };
239 
240 /**
241  *	sil680_init_chip		-	chip setup
242  *	@pdev: PCI device
243  *	@try_mmio: Indicates to caller whether MMIO should be attempted
244  *
245  *	Perform all the chip setup which must be done both when the device
246  *	is powered up on boot and when we resume in case we resumed from RAM.
247  *	Returns the final clock settings.
248  */
249 
sil680_init_chip(struct pci_dev * pdev,int * try_mmio)250 static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio)
251 {
252 	u8 tmpbyte	= 0;
253 
254 	/* FIXME: double check */
255 	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
256 			      pdev->revision ? 1 : 255);
257 
258 	pci_write_config_byte(pdev, 0x80, 0x00);
259 	pci_write_config_byte(pdev, 0x84, 0x00);
260 
261 	pci_read_config_byte(pdev, 0x8A, &tmpbyte);
262 
263 	dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
264 		tmpbyte & 1, tmpbyte & 0x30);
265 
266 	*try_mmio = 0;
267 #ifdef CONFIG_PPC
268 	if (machine_is(cell))
269 		*try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
270 #endif
271 
272 	switch (tmpbyte & 0x30) {
273 	case 0x00:
274 		/* 133 clock attempt to force it on */
275 		pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
276 		break;
277 	case 0x30:
278 		/* if clocking is disabled */
279 		/* 133 clock attempt to force it on */
280 		pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
281 		break;
282 	case 0x10:
283 		/* 133 already */
284 		break;
285 	case 0x20:
286 		/* BIOS set PCI x2 clocking */
287 		break;
288 	}
289 
290 	pci_read_config_byte(pdev,   0x8A, &tmpbyte);
291 	dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
292 		tmpbyte & 1, tmpbyte & 0x30);
293 
294 	pci_write_config_byte(pdev,  0xA1, 0x72);
295 	pci_write_config_word(pdev,  0xA2, 0x328A);
296 	pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
297 	pci_write_config_dword(pdev, 0xA8, 0x43924392);
298 	pci_write_config_dword(pdev, 0xAC, 0x40094009);
299 	pci_write_config_byte(pdev,  0xB1, 0x72);
300 	pci_write_config_word(pdev,  0xB2, 0x328A);
301 	pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
302 	pci_write_config_dword(pdev, 0xB8, 0x43924392);
303 	pci_write_config_dword(pdev, 0xBC, 0x40094009);
304 
305 	switch (tmpbyte & 0x30) {
306 	case 0x00:
307 		dev_info(&pdev->dev, "sil680: 100MHz clock.\n");
308 		break;
309 	case 0x10:
310 		dev_info(&pdev->dev, "sil680: 133MHz clock.\n");
311 		break;
312 	case 0x20:
313 		dev_info(&pdev->dev, "sil680: Using PCI clock.\n");
314 		break;
315 	/* This last case is _NOT_ ok */
316 	case 0x30:
317 		dev_err(&pdev->dev, "sil680: Clock disabled ?\n");
318 	}
319 	return tmpbyte & 0x30;
320 }
321 
sil680_init_one(struct pci_dev * pdev,const struct pci_device_id * id)322 static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
323 {
324 	static const struct ata_port_info info = {
325 		.flags = ATA_FLAG_SLAVE_POSS,
326 		.pio_mask = ATA_PIO4,
327 		.mwdma_mask = ATA_MWDMA2,
328 		.udma_mask = ATA_UDMA6,
329 		.port_ops = &sil680_port_ops
330 	};
331 	static const struct ata_port_info info_slow = {
332 		.flags = ATA_FLAG_SLAVE_POSS,
333 		.pio_mask = ATA_PIO4,
334 		.mwdma_mask = ATA_MWDMA2,
335 		.udma_mask = ATA_UDMA5,
336 		.port_ops = &sil680_port_ops
337 	};
338 	const struct ata_port_info *ppi[] = { &info, NULL };
339 	struct ata_host *host;
340 	void __iomem *mmio_base;
341 	int rc, try_mmio;
342 
343 	ata_print_version_once(&pdev->dev, DRV_VERSION);
344 
345 	rc = pcim_enable_device(pdev);
346 	if (rc)
347 		return rc;
348 
349 	switch (sil680_init_chip(pdev, &try_mmio)) {
350 		case 0:
351 			ppi[0] = &info_slow;
352 			break;
353 		case 0x30:
354 			return -ENODEV;
355 	}
356 
357 	if (!try_mmio)
358 		goto use_ioports;
359 
360 	/* Try to acquire MMIO resources and fallback to PIO if
361 	 * that fails
362 	 */
363 	rc = pcim_iomap_regions(pdev, 1 << SIL680_MMIO_BAR, DRV_NAME);
364 	if (rc)
365 		goto use_ioports;
366 
367 	/* Allocate host and set it up */
368 	host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
369 	if (!host)
370 		return -ENOMEM;
371 	host->iomap = pcim_iomap_table(pdev);
372 
373 	/* Setup DMA masks */
374 	rc = dma_set_mask_and_coherent(&pdev->dev, ATA_DMA_MASK);
375 	if (rc)
376 		return rc;
377 	pci_set_master(pdev);
378 
379 	/* Get MMIO base and initialize port addresses */
380 	mmio_base = host->iomap[SIL680_MMIO_BAR];
381 	host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x00;
382 	host->ports[0]->ioaddr.cmd_addr = mmio_base + 0x80;
383 	host->ports[0]->ioaddr.ctl_addr = mmio_base + 0x8a;
384 	host->ports[0]->ioaddr.altstatus_addr = mmio_base + 0x8a;
385 	ata_sff_std_ports(&host->ports[0]->ioaddr);
386 	host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x08;
387 	host->ports[1]->ioaddr.cmd_addr = mmio_base + 0xc0;
388 	host->ports[1]->ioaddr.ctl_addr = mmio_base + 0xca;
389 	host->ports[1]->ioaddr.altstatus_addr = mmio_base + 0xca;
390 	ata_sff_std_ports(&host->ports[1]->ioaddr);
391 
392 	/* Register & activate */
393 	return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
394 				 IRQF_SHARED, &sil680_sht);
395 
396 use_ioports:
397 	return ata_pci_bmdma_init_one(pdev, ppi, &sil680_sht, NULL, 0);
398 }
399 
400 #ifdef CONFIG_PM_SLEEP
sil680_reinit_one(struct pci_dev * pdev)401 static int sil680_reinit_one(struct pci_dev *pdev)
402 {
403 	struct ata_host *host = pci_get_drvdata(pdev);
404 	int try_mmio, rc;
405 
406 	rc = ata_pci_device_do_resume(pdev);
407 	if (rc)
408 		return rc;
409 	sil680_init_chip(pdev, &try_mmio);
410 	ata_host_resume(host);
411 	return 0;
412 }
413 #endif
414 
415 static const struct pci_device_id sil680[] = {
416 	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
417 
418 	{ },
419 };
420 
421 static struct pci_driver sil680_pci_driver = {
422 	.name 		= DRV_NAME,
423 	.id_table	= sil680,
424 	.probe 		= sil680_init_one,
425 	.remove		= ata_pci_remove_one,
426 #ifdef CONFIG_PM_SLEEP
427 	.suspend	= ata_pci_device_suspend,
428 	.resume		= sil680_reinit_one,
429 #endif
430 };
431 
432 module_pci_driver(sil680_pci_driver);
433 
434 MODULE_AUTHOR("Alan Cox");
435 MODULE_DESCRIPTION("low-level driver for SI680 PATA");
436 MODULE_LICENSE("GPL");
437 MODULE_DEVICE_TABLE(pci, sil680);
438 MODULE_VERSION(DRV_VERSION);
439