xref: /openbmc/linux/drivers/ata/pata_efar.c (revision afdfe899e6420eac6c5eb3bc8c89456dff38d40e)
1 /*
2  *    pata_efar.c - EFAR PIIX clone controller driver
3  *
4  *	(C) 2005 Red Hat <alan@redhat.com>
5  *
6  *    Some parts based on ata_piix.c by Jeff Garzik and others.
7  *
8  *    The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
9  *    Intel ICH controllers the EFAR widened the UDMA mode register bits
10  *    and doesn't require the funky clock selection.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/init.h>
17 #include <linux/blkdev.h>
18 #include <linux/delay.h>
19 #include <linux/device.h>
20 #include <scsi/scsi_host.h>
21 #include <linux/libata.h>
22 #include <linux/ata.h>
23 
24 #define DRV_NAME	"pata_efar"
25 #define DRV_VERSION	"0.4.2"
26 
27 /**
28  *	efar_pre_reset	-	check for 40/80 pin
29  *	@ap: Port
30  *
31  *	Perform cable detection for the EFAR ATA interface. This is
32  *	different to the PIIX arrangement
33  */
34 
35 static int efar_pre_reset(struct ata_port *ap)
36 {
37 	static const struct pci_bits efar_enable_bits[] = {
38 		{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
39 		{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
40 	};
41 
42 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
43 	u8 tmp;
44 
45 	if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
46 		return -ENOENT;
47 
48 	pci_read_config_byte(pdev, 0x47, &tmp);
49 	if (tmp & (2 >> ap->port_no))
50 		ap->cbl = ATA_CBL_PATA40;
51 	else
52 		ap->cbl = ATA_CBL_PATA80;
53 	return ata_std_prereset(ap);
54 }
55 
56 /**
57  *	efar_probe_reset - Probe specified port on PATA host controller
58  *	@ap: Port to probe
59  *
60  *	LOCKING:
61  *	None (inherited from caller).
62  */
63 
64 static void efar_error_handler(struct ata_port *ap)
65 {
66 	ata_bmdma_drive_eh(ap, efar_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
67 }
68 
69 /**
70  *	efar_set_piomode - Initialize host controller PATA PIO timings
71  *	@ap: Port whose timings we are configuring
72  *	@adev: um
73  *
74  *	Set PIO mode for device, in host controller PCI config space.
75  *
76  *	LOCKING:
77  *	None (inherited from caller).
78  */
79 
80 static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
81 {
82 	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
83 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
84 	unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
85 	u16 idetm_data;
86 	int control = 0;
87 
88 	/*
89 	 *	See Intel Document 298600-004 for the timing programing rules
90 	 *	for PIIX/ICH. The EFAR is a clone so very similar
91 	 */
92 
93 	static const	 /* ISP  RTC */
94 	u8 timings[][2]	= { { 0, 0 },
95 			    { 0, 0 },
96 			    { 1, 0 },
97 			    { 2, 1 },
98 			    { 2, 3 }, };
99 
100 	if (pio > 2)
101 		control |= 1;	/* TIME1 enable */
102 	if (ata_pio_need_iordy(adev))	/* PIO 3/4 require IORDY */
103 		control |= 2;	/* IE enable */
104 	/* Intel specifies that the PPE functionality is for disk only */
105 	if (adev->class == ATA_DEV_ATA)
106 		control |= 4;	/* PPE enable */
107 
108 	pci_read_config_word(dev, idetm_port, &idetm_data);
109 
110 	/* Enable PPE, IE and TIME as appropriate */
111 
112 	if (adev->devno == 0) {
113 		idetm_data &= 0xCCF0;
114 		idetm_data |= control;
115 		idetm_data |= (timings[pio][0] << 12) |
116 			(timings[pio][1] << 8);
117 	} else {
118 		int shift = 4 * ap->port_no;
119 		u8 slave_data;
120 
121 		idetm_data &= 0xCC0F;
122 		idetm_data |= (control << 4);
123 
124 		/* Slave timing in seperate register */
125 		pci_read_config_byte(dev, 0x44, &slave_data);
126 		slave_data &= 0x0F << shift;
127 		slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
128 		pci_write_config_byte(dev, 0x44, slave_data);
129 	}
130 
131 	idetm_data |= 0x4000;	/* Ensure SITRE is enabled */
132 	pci_write_config_word(dev, idetm_port, idetm_data);
133 }
134 
135 /**
136  *	efar_set_dmamode - Initialize host controller PATA DMA timings
137  *	@ap: Port whose timings we are configuring
138  *	@adev: Device to program
139  *
140  *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
141  *
142  *	LOCKING:
143  *	None (inherited from caller).
144  */
145 
146 static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
147 {
148 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
149 	u8 master_port		= ap->port_no ? 0x42 : 0x40;
150 	u16 master_data;
151 	u8 speed		= adev->dma_mode;
152 	int devid		= adev->devno + 2 * ap->port_no;
153 	u8 udma_enable;
154 
155 	static const	 /* ISP  RTC */
156 	u8 timings[][2]	= { { 0, 0 },
157 			    { 0, 0 },
158 			    { 1, 0 },
159 			    { 2, 1 },
160 			    { 2, 3 }, };
161 
162 	pci_read_config_word(dev, master_port, &master_data);
163 	pci_read_config_byte(dev, 0x48, &udma_enable);
164 
165 	if (speed >= XFER_UDMA_0) {
166 		unsigned int udma	= adev->dma_mode - XFER_UDMA_0;
167 		u16 udma_timing;
168 
169 		udma_enable |= (1 << devid);
170 
171 		/* Load the UDMA mode number */
172 		pci_read_config_word(dev, 0x4A, &udma_timing);
173 		udma_timing &= ~(7 << (4 * devid));
174 		udma_timing |= udma << (4 * devid);
175 		pci_write_config_word(dev, 0x4A, udma_timing);
176 	} else {
177 		/*
178 		 * MWDMA is driven by the PIO timings. We must also enable
179 		 * IORDY unconditionally along with TIME1. PPE has already
180 		 * been set when the PIO timing was set.
181 		 */
182 		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;
183 		unsigned int control;
184 		u8 slave_data;
185 		const unsigned int needed_pio[3] = {
186 			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
187 		};
188 		int pio = needed_pio[mwdma] - XFER_PIO_0;
189 
190 		control = 3;	/* IORDY|TIME1 */
191 
192 		/* If the drive MWDMA is faster than it can do PIO then
193 		   we must force PIO into PIO0 */
194 
195 		if (adev->pio_mode < needed_pio[mwdma])
196 			/* Enable DMA timing only */
197 			control |= 8;	/* PIO cycles in PIO0 */
198 
199 		if (adev->devno) {	/* Slave */
200 			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
201 			master_data |= control << 4;
202 			pci_read_config_byte(dev, 0x44, &slave_data);
203 			slave_data &= (0x0F + 0xE1 * ap->port_no);
204 			/* Load the matching timing */
205 			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
206 			pci_write_config_byte(dev, 0x44, slave_data);
207 		} else { 	/* Master */
208 			master_data &= 0xCCF4;	/* Mask out IORDY|TIME1|DMAONLY
209 						   and master timing bits */
210 			master_data |= control;
211 			master_data |=
212 				(timings[pio][0] << 12) |
213 				(timings[pio][1] << 8);
214 		}
215 		udma_enable &= ~(1 << devid);
216 		pci_write_config_word(dev, master_port, master_data);
217 	}
218 	pci_write_config_byte(dev, 0x48, udma_enable);
219 }
220 
221 static struct scsi_host_template efar_sht = {
222 	.module			= THIS_MODULE,
223 	.name			= DRV_NAME,
224 	.ioctl			= ata_scsi_ioctl,
225 	.queuecommand		= ata_scsi_queuecmd,
226 	.can_queue		= ATA_DEF_QUEUE,
227 	.this_id		= ATA_SHT_THIS_ID,
228 	.sg_tablesize		= LIBATA_MAX_PRD,
229 	.max_sectors		= ATA_MAX_SECTORS,
230 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
231 	.emulated		= ATA_SHT_EMULATED,
232 	.use_clustering		= ATA_SHT_USE_CLUSTERING,
233 	.proc_name		= DRV_NAME,
234 	.dma_boundary		= ATA_DMA_BOUNDARY,
235 	.slave_configure	= ata_scsi_slave_config,
236 	.slave_destroy		= ata_scsi_slave_destroy,
237 	.bios_param		= ata_std_bios_param,
238 };
239 
240 static const struct ata_port_operations efar_ops = {
241 	.port_disable		= ata_port_disable,
242 	.set_piomode		= efar_set_piomode,
243 	.set_dmamode		= efar_set_dmamode,
244 	.mode_filter		= ata_pci_default_filter,
245 
246 	.tf_load		= ata_tf_load,
247 	.tf_read		= ata_tf_read,
248 	.check_status		= ata_check_status,
249 	.exec_command		= ata_exec_command,
250 	.dev_select		= ata_std_dev_select,
251 
252 	.freeze			= ata_bmdma_freeze,
253 	.thaw			= ata_bmdma_thaw,
254 	.error_handler		= efar_error_handler,
255 	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
256 
257 	.bmdma_setup		= ata_bmdma_setup,
258 	.bmdma_start		= ata_bmdma_start,
259 	.bmdma_stop		= ata_bmdma_stop,
260 	.bmdma_status		= ata_bmdma_status,
261 	.qc_prep		= ata_qc_prep,
262 	.qc_issue		= ata_qc_issue_prot,
263 	.data_xfer		= ata_pio_data_xfer,
264 
265 	.irq_handler		= ata_interrupt,
266 	.irq_clear		= ata_bmdma_irq_clear,
267 
268 	.port_start		= ata_port_start,
269 	.port_stop		= ata_port_stop,
270 	.host_stop		= ata_host_stop,
271 };
272 
273 
274 /**
275  *	efar_init_one - Register EFAR ATA PCI device with kernel services
276  *	@pdev: PCI device to register
277  *	@ent: Entry in efar_pci_tbl matching with @pdev
278  *
279  *	Called from kernel PCI layer.
280  *
281  *	LOCKING:
282  *	Inherited from PCI layer (may sleep).
283  *
284  *	RETURNS:
285  *	Zero on success, or -ERRNO value.
286  */
287 
288 static int efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
289 {
290 	static int printed_version;
291 	static struct ata_port_info info = {
292 		.sht		= &efar_sht,
293 		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
294 		.pio_mask	= 0x1f,	/* pio0-4 */
295 		.mwdma_mask	= 0x07, /* mwdma1-2 */
296 		.udma_mask 	= 0x0f, /* UDMA 66 */
297 		.port_ops	= &efar_ops,
298 	};
299 	static struct ata_port_info *port_info[2] = { &info, &info };
300 
301 	if (!printed_version++)
302 		dev_printk(KERN_DEBUG, &pdev->dev,
303 			   "version " DRV_VERSION "\n");
304 
305 	return ata_pci_init_one(pdev, port_info, 2);
306 }
307 
308 static const struct pci_device_id efar_pci_tbl[] = {
309 	{ PCI_VDEVICE(EFAR, 0x9130), },
310 
311 	{ }	/* terminate list */
312 };
313 
314 static struct pci_driver efar_pci_driver = {
315 	.name			= DRV_NAME,
316 	.id_table		= efar_pci_tbl,
317 	.probe			= efar_init_one,
318 	.remove			= ata_pci_remove_one,
319 };
320 
321 static int __init efar_init(void)
322 {
323 	return pci_register_driver(&efar_pci_driver);
324 }
325 
326 static void __exit efar_exit(void)
327 {
328 	pci_unregister_driver(&efar_pci_driver);
329 }
330 
331 module_init(efar_init);
332 module_exit(efar_exit);
333 
334 MODULE_AUTHOR("Alan Cox");
335 MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
336 MODULE_LICENSE("GPL");
337 MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
338 MODULE_VERSION(DRV_VERSION);
339 
340