pata_radisys.c revision afdfe899e6420eac6c5eb3bc8c89456dff38d40e 
1/*
2 *    pata_radisys.c - Intel PATA/SATA controllers
3 *
4 *	(C) 2006 Red Hat <alan@redhat.com>
5 *
6 *    Some parts based on ata_piix.c by Jeff Garzik and others.
7 *
8 *    A PIIX relative, this device has a single ATA channel and no
9 *    slave timings, SITRE or PPE. In that sense it is a close relative
10 *    of the original PIIX. It does however support UDMA 33/66 per channel
11 *    although no other modes/timings. Also lacking is 32bit I/O on the ATA
12 *    port.
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/pci.h>
18#include <linux/init.h>
19#include <linux/blkdev.h>
20#include <linux/delay.h>
21#include <linux/device.h>
22#include <scsi/scsi_host.h>
23#include <linux/libata.h>
24#include <linux/ata.h>
25
26#define DRV_NAME	"pata_radisys"
27#define DRV_VERSION	"0.4.1"
28
29/**
30 *	radisys_probe_init		-	probe begin
31 *	@ap: ATA port
32 *
33 *	Set up cable type and use generic probe init
34 */
35
36static int radisys_pre_reset(struct ata_port *ap)
37{
38	ap->cbl = ATA_CBL_PATA80;
39	return ata_std_prereset(ap);
40}
41
42
43/**
44 *	radisys_pata_error_handler - Probe specified port on PATA host controller
45 *	@ap: Port to probe
46 *	@classes:
47 *
48 *	LOCKING:
49 *	None (inherited from caller).
50 */
51
52static void radisys_pata_error_handler(struct ata_port *ap)
53{
54	ata_bmdma_drive_eh(ap, radisys_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
55}
56
57/**
58 *	radisys_set_piomode - Initialize host controller PATA PIO timings
59 *	@ap: Port whose timings we are configuring
60 *	@adev: um
61 *
62 *	Set PIO mode for device, in host controller PCI config space.
63 *
64 *	LOCKING:
65 *	None (inherited from caller).
66 */
67
68static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)
69{
70	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
71	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
72	u16 idetm_data;
73	int control = 0;
74
75	/*
76	 *	See Intel Document 298600-004 for the timing programing rules
77	 *	for PIIX/ICH. Note that the early PIIX does not have the slave
78	 *	timing port at 0x44. The Radisys is a relative of the PIIX
79	 *	but not the same so be careful.
80	 */
81
82	static const	 /* ISP  RTC */
83	u8 timings[][2]	= { { 0, 0 },	/* Check me */
84			    { 0, 0 },
85			    { 1, 1 },
86			    { 2, 2 },
87			    { 3, 3 }, };
88
89	if (pio > 0)
90		control |= 1;	/* TIME1 enable */
91	if (ata_pio_need_iordy(adev))
92		control |= 2;	/* IE IORDY */
93
94	pci_read_config_word(dev, 0x40, &idetm_data);
95
96	/* Enable IE and TIME as appropriate. Clear the other
97	   drive timing bits */
98	idetm_data &= 0xCCCC;
99	idetm_data |= (control << (4 * adev->devno));
100	idetm_data |= (timings[pio][0] << 12) |
101			(timings[pio][1] << 8);
102	pci_write_config_word(dev, 0x40, idetm_data);
103
104	/* Track which port is configured */
105	ap->private_data = adev;
106}
107
108/**
109 *	radisys_set_dmamode - Initialize host controller PATA DMA timings
110 *	@ap: Port whose timings we are configuring
111 *	@adev: Device to program
112 *	@isich: True if the device is an ICH and has IOCFG registers
113 *
114 *	Set MWDMA mode for device, in host controller PCI config space.
115 *
116 *	LOCKING:
117 *	None (inherited from caller).
118 */
119
120static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
121{
122	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
123	u16 idetm_data;
124	u8 udma_enable;
125
126	static const	 /* ISP  RTC */
127	u8 timings[][2]	= { { 0, 0 },
128			    { 0, 0 },
129			    { 1, 1 },
130			    { 2, 2 },
131			    { 3, 3 }, };
132
133	/*
134	 * MWDMA is driven by the PIO timings. We must also enable
135	 * IORDY unconditionally.
136	 */
137
138	pci_read_config_word(dev, 0x40, &idetm_data);
139	pci_read_config_byte(dev, 0x48, &udma_enable);
140
141	if (adev->dma_mode < XFER_UDMA_0) {
142		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;
143		const unsigned int needed_pio[3] = {
144			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
145		};
146		int pio = needed_pio[mwdma] - XFER_PIO_0;
147		int control = 3;	/* IORDY|TIME0 */
148
149		/* If the drive MWDMA is faster than it can do PIO then
150		   we must force PIO0 for PIO cycles. */
151
152		if (adev->pio_mode < needed_pio[mwdma])
153			control = 1;
154
155		/* Mask out the relevant control and timing bits we will load. Also
156		   clear the other drive TIME register as a precaution */
157
158		idetm_data &= 0xCCCC;
159		idetm_data |= control << (4 * adev->devno);
160		idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
161
162		udma_enable &= ~(1 << adev->devno);
163	} else {
164		u8 udma_mode;
165
166		/* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */
167
168		pci_read_config_byte(dev, 0x4A, &udma_mode);
169
170		if (adev->xfer_mode == XFER_UDMA_2)
171			udma_mode &= ~ (1 << adev->devno);
172		else /* UDMA 4 */
173			udma_mode |= (1 << adev->devno);
174
175		pci_write_config_byte(dev, 0x4A, udma_mode);
176
177		udma_enable |= (1 << adev->devno);
178	}
179	pci_write_config_word(dev, 0x40, idetm_data);
180	pci_write_config_byte(dev, 0x48, udma_enable);
181
182	/* Track which port is configured */
183	ap->private_data = adev;
184}
185
186/**
187 *	radisys_qc_issue_prot	-	command issue
188 *	@qc: command pending
189 *
190 *	Called when the libata layer is about to issue a command. We wrap
191 *	this interface so that we can load the correct ATA timings if
192 *	neccessary. Our logic also clears TIME0/TIME1 for the other device so
193 *	that, even if we get this wrong, cycles to the other device will
194 *	be made PIO0.
195 */
196
197static unsigned int radisys_qc_issue_prot(struct ata_queued_cmd *qc)
198{
199	struct ata_port *ap = qc->ap;
200	struct ata_device *adev = qc->dev;
201
202	if (adev != ap->private_data) {
203		/* UDMA timing is not shared */
204		if (adev->dma_mode < XFER_UDMA_0) {
205			if (adev->dma_mode)
206				radisys_set_dmamode(ap, adev);
207			else if (adev->pio_mode)
208				radisys_set_piomode(ap, adev);
209		}
210	}
211	return ata_qc_issue_prot(qc);
212}
213
214
215static struct scsi_host_template radisys_sht = {
216	.module			= THIS_MODULE,
217	.name			= DRV_NAME,
218	.ioctl			= ata_scsi_ioctl,
219	.queuecommand		= ata_scsi_queuecmd,
220	.can_queue		= ATA_DEF_QUEUE,
221	.this_id		= ATA_SHT_THIS_ID,
222	.sg_tablesize		= LIBATA_MAX_PRD,
223	.max_sectors		= ATA_MAX_SECTORS,
224	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
225	.emulated		= ATA_SHT_EMULATED,
226	.use_clustering		= ATA_SHT_USE_CLUSTERING,
227	.proc_name		= DRV_NAME,
228	.dma_boundary		= ATA_DMA_BOUNDARY,
229	.slave_configure	= ata_scsi_slave_config,
230	.slave_destroy		= ata_scsi_slave_destroy,
231	.bios_param		= ata_std_bios_param,
232};
233
234static const struct ata_port_operations radisys_pata_ops = {
235	.port_disable		= ata_port_disable,
236	.set_piomode		= radisys_set_piomode,
237	.set_dmamode		= radisys_set_dmamode,
238	.mode_filter		= ata_pci_default_filter,
239
240	.tf_load		= ata_tf_load,
241	.tf_read		= ata_tf_read,
242	.check_status		= ata_check_status,
243	.exec_command		= ata_exec_command,
244	.dev_select		= ata_std_dev_select,
245
246	.freeze			= ata_bmdma_freeze,
247	.thaw			= ata_bmdma_thaw,
248	.error_handler		= radisys_pata_error_handler,
249	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
250
251	.bmdma_setup		= ata_bmdma_setup,
252	.bmdma_start		= ata_bmdma_start,
253	.bmdma_stop		= ata_bmdma_stop,
254	.bmdma_status		= ata_bmdma_status,
255	.qc_prep		= ata_qc_prep,
256	.qc_issue		= radisys_qc_issue_prot,
257	.data_xfer		= ata_pio_data_xfer,
258
259	.irq_handler		= ata_interrupt,
260	.irq_clear		= ata_bmdma_irq_clear,
261
262	.port_start		= ata_port_start,
263	.port_stop		= ata_port_stop,
264	.host_stop		= ata_host_stop,
265};
266
267
268/**
269 *	radisys_init_one - Register PIIX ATA PCI device with kernel services
270 *	@pdev: PCI device to register
271 *	@ent: Entry in radisys_pci_tbl matching with @pdev
272 *
273 *	Called from kernel PCI layer.  We probe for combined mode (sigh),
274 *	and then hand over control to libata, for it to do the rest.
275 *
276 *	LOCKING:
277 *	Inherited from PCI layer (may sleep).
278 *
279 *	RETURNS:
280 *	Zero on success, or -ERRNO value.
281 */
282
283static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
284{
285	static int printed_version;
286	static struct ata_port_info info = {
287		.sht		= &radisys_sht,
288		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
289		.pio_mask	= 0x1f,	/* pio0-4 */
290		.mwdma_mask	= 0x07, /* mwdma1-2 */
291		.udma_mask	= 0x14, /* UDMA33/66 only */
292		.port_ops	= &radisys_pata_ops,
293	};
294	static struct ata_port_info *port_info[2] = { &info, &info };
295
296	if (!printed_version++)
297		dev_printk(KERN_DEBUG, &pdev->dev,
298			   "version " DRV_VERSION "\n");
299
300	return ata_pci_init_one(pdev, port_info, 2);
301}
302
303static const struct pci_device_id radisys_pci_tbl[] = {
304	{ PCI_VDEVICE(RADISYS, 0x8201), },
305
306	{ }	/* terminate list */
307};
308
309static struct pci_driver radisys_pci_driver = {
310	.name			= DRV_NAME,
311	.id_table		= radisys_pci_tbl,
312	.probe			= radisys_init_one,
313	.remove			= ata_pci_remove_one,
314};
315
316static int __init radisys_init(void)
317{
318	return pci_register_driver(&radisys_pci_driver);
319}
320
321static void __exit radisys_exit(void)
322{
323	pci_unregister_driver(&radisys_pci_driver);
324}
325
326module_init(radisys_init);
327module_exit(radisys_exit);
328
329MODULE_AUTHOR("Alan Cox");
330MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");
331MODULE_LICENSE("GPL");
332MODULE_DEVICE_TABLE(pci, radisys_pci_tbl);
333MODULE_VERSION(DRV_VERSION);
334
335