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9b13b682 AC |
1 | /* |
2 | * pata_it8213.c - iTE Tech. Inc. IT8213 PATA driver | |
3 | * | |
4 | * The IT8213 is a very Intel ICH like device for timing purposes, having | |
5 | * a similar register layout and the same split clock arrangement. Cable | |
6 | * detection is different, and it does not have slave channels or all the | |
7 | * clutter of later ICH/SATA setups. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/blkdev.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/device.h> | |
17 | #include <scsi/scsi_host.h> | |
18 | #include <linux/libata.h> | |
19 | #include <linux/ata.h> | |
20 | ||
21 | #define DRV_NAME "pata_it8213" | |
8bc3fc47 | 22 | #define DRV_VERSION "0.0.3" |
9b13b682 AC |
23 | |
24 | /** | |
25 | * it8213_pre_reset - check for 40/80 pin | |
cc0680a5 | 26 | * @link: link |
d4b2bab4 | 27 | * @deadline: deadline jiffies for the operation |
9b13b682 | 28 | * |
5816fbbf AC |
29 | * Filter out ports by the enable bits before doing the normal reset |
30 | * and probe. | |
9b13b682 AC |
31 | */ |
32 | ||
cc0680a5 | 33 | static int it8213_pre_reset(struct ata_link *link, unsigned long deadline) |
9b13b682 AC |
34 | { |
35 | static const struct pci_bits it8213_enable_bits[] = { | |
36 | { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */ | |
37 | }; | |
cc0680a5 | 38 | struct ata_port *ap = link->ap; |
9b13b682 | 39 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
9b13b682 AC |
40 | if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no])) |
41 | return -ENOENT; | |
d4b2bab4 | 42 | |
cc0680a5 | 43 | return ata_std_prereset(link, deadline); |
9b13b682 AC |
44 | } |
45 | ||
46 | /** | |
5816fbbf | 47 | * it8213_error_handler - Probe specified port on PATA host controller |
9b13b682 AC |
48 | * @ap: Port to probe |
49 | * | |
50 | * LOCKING: | |
51 | * None (inherited from caller). | |
52 | */ | |
53 | ||
54 | static void it8213_error_handler(struct ata_port *ap) | |
55 | { | |
56 | ata_bmdma_drive_eh(ap, it8213_pre_reset, ata_std_softreset, NULL, ata_std_postreset); | |
57 | } | |
58 | ||
5816fbbf AC |
59 | /** |
60 | * it8213_cable_detect - check for 40/80 pin | |
61 | * @ap: Port | |
62 | * | |
63 | * Perform cable detection for the 8213 ATA interface. This is | |
64 | * different to the PIIX arrangement | |
65 | */ | |
66 | ||
67 | static int it8213_cable_detect(struct ata_port *ap) | |
68 | { | |
69 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
70 | u8 tmp; | |
71 | pci_read_config_byte(pdev, 0x42, &tmp); | |
72 | if (tmp & 2) /* The initial docs are incorrect */ | |
73 | return ATA_CBL_PATA40; | |
74 | return ATA_CBL_PATA80; | |
75 | } | |
76 | ||
9b13b682 AC |
77 | /** |
78 | * it8213_set_piomode - Initialize host controller PATA PIO timings | |
79 | * @ap: Port whose timings we are configuring | |
5816fbbf | 80 | * @adev: Device whose timings we are configuring |
9b13b682 AC |
81 | * |
82 | * Set PIO mode for device, in host controller PCI config space. | |
83 | * | |
84 | * LOCKING: | |
85 | * None (inherited from caller). | |
86 | */ | |
87 | ||
88 | static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev) | |
89 | { | |
90 | unsigned int pio = adev->pio_mode - XFER_PIO_0; | |
91 | struct pci_dev *dev = to_pci_dev(ap->host->dev); | |
92 | unsigned int idetm_port= ap->port_no ? 0x42 : 0x40; | |
93 | u16 idetm_data; | |
94 | int control = 0; | |
95 | ||
96 | /* | |
97 | * See Intel Document 298600-004 for the timing programing rules | |
98 | * for PIIX/ICH. The 8213 is a clone so very similar | |
99 | */ | |
100 | ||
101 | static const /* ISP RTC */ | |
102 | u8 timings[][2] = { { 0, 0 }, | |
103 | { 0, 0 }, | |
104 | { 1, 0 }, | |
105 | { 2, 1 }, | |
106 | { 2, 3 }, }; | |
107 | ||
108 | if (pio > 2) | |
109 | control |= 1; /* TIME1 enable */ | |
110 | if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */ | |
111 | control |= 2; /* IORDY enable */ | |
112 | /* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */ | |
113 | if (adev->class != ATA_DEV_ATA) | |
114 | control |= 4; | |
115 | ||
116 | pci_read_config_word(dev, idetm_port, &idetm_data); | |
117 | ||
118 | /* Enable PPE, IE and TIME as appropriate */ | |
119 | ||
120 | if (adev->devno == 0) { | |
121 | idetm_data &= 0xCCF0; | |
122 | idetm_data |= control; | |
123 | idetm_data |= (timings[pio][0] << 12) | | |
124 | (timings[pio][1] << 8); | |
125 | } else { | |
126 | u8 slave_data; | |
127 | ||
128 | idetm_data &= 0xCC0F; | |
129 | idetm_data |= (control << 4); | |
130 | ||
1967b7ff | 131 | /* Slave timing in separate register */ |
9b13b682 AC |
132 | pci_read_config_byte(dev, 0x44, &slave_data); |
133 | slave_data &= 0xF0; | |
134 | slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << 4; | |
135 | pci_write_config_byte(dev, 0x44, slave_data); | |
136 | } | |
137 | ||
138 | idetm_data |= 0x4000; /* Ensure SITRE is enabled */ | |
139 | pci_write_config_word(dev, idetm_port, idetm_data); | |
140 | } | |
141 | ||
142 | /** | |
143 | * it8213_set_dmamode - Initialize host controller PATA DMA timings | |
144 | * @ap: Port whose timings we are configuring | |
145 | * @adev: Device to program | |
146 | * | |
147 | * Set UDMA/MWDMA mode for device, in host controller PCI config space. | |
148 | * This device is basically an ICH alike. | |
149 | * | |
150 | * LOCKING: | |
151 | * None (inherited from caller). | |
152 | */ | |
153 | ||
154 | static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev) | |
155 | { | |
156 | struct pci_dev *dev = to_pci_dev(ap->host->dev); | |
157 | u16 master_data; | |
158 | u8 speed = adev->dma_mode; | |
159 | int devid = adev->devno; | |
160 | u8 udma_enable; | |
161 | ||
162 | static const /* ISP RTC */ | |
163 | u8 timings[][2] = { { 0, 0 }, | |
164 | { 0, 0 }, | |
165 | { 1, 0 }, | |
166 | { 2, 1 }, | |
167 | { 2, 3 }, }; | |
168 | ||
169 | pci_read_config_word(dev, 0x40, &master_data); | |
170 | pci_read_config_byte(dev, 0x48, &udma_enable); | |
171 | ||
172 | if (speed >= XFER_UDMA_0) { | |
173 | unsigned int udma = adev->dma_mode - XFER_UDMA_0; | |
174 | u16 udma_timing; | |
175 | u16 ideconf; | |
176 | int u_clock, u_speed; | |
177 | ||
178 | /* Clocks follow the PIIX style */ | |
179 | u_speed = min(2 - (udma & 1), udma); | |
180 | if (udma == 5) | |
181 | u_clock = 0x1000; /* 100Mhz */ | |
182 | else if (udma > 2) | |
183 | u_clock = 1; /* 66Mhz */ | |
184 | else | |
185 | u_clock = 0; /* 33Mhz */ | |
186 | ||
187 | udma_enable |= (1 << devid); | |
188 | ||
189 | /* Load the UDMA mode number */ | |
190 | pci_read_config_word(dev, 0x4A, &udma_timing); | |
191 | udma_timing &= ~(3 << (4 * devid)); | |
192 | udma_timing |= (udma & 3) << (4 * devid); | |
193 | pci_write_config_word(dev, 0x4A, udma_timing); | |
194 | ||
195 | /* Load the clock selection */ | |
196 | pci_read_config_word(dev, 0x54, &ideconf); | |
197 | ideconf &= ~(0x1001 << devid); | |
198 | ideconf |= u_clock << devid; | |
199 | pci_write_config_word(dev, 0x54, ideconf); | |
200 | } else { | |
201 | /* | |
202 | * MWDMA is driven by the PIO timings. We must also enable | |
203 | * IORDY unconditionally along with TIME1. PPE has already | |
204 | * been set when the PIO timing was set. | |
205 | */ | |
206 | unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; | |
207 | unsigned int control; | |
208 | u8 slave_data; | |
209 | static const unsigned int needed_pio[3] = { | |
210 | XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 | |
211 | }; | |
212 | int pio = needed_pio[mwdma] - XFER_PIO_0; | |
213 | ||
214 | control = 3; /* IORDY|TIME1 */ | |
215 | ||
216 | /* If the drive MWDMA is faster than it can do PIO then | |
217 | we must force PIO into PIO0 */ | |
218 | ||
219 | if (adev->pio_mode < needed_pio[mwdma]) | |
220 | /* Enable DMA timing only */ | |
221 | control |= 8; /* PIO cycles in PIO0 */ | |
222 | ||
223 | if (devid) { /* Slave */ | |
224 | master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */ | |
225 | master_data |= control << 4; | |
226 | pci_read_config_byte(dev, 0x44, &slave_data); | |
227 | slave_data &= (0x0F + 0xE1 * ap->port_no); | |
228 | /* Load the matching timing */ | |
229 | slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); | |
230 | pci_write_config_byte(dev, 0x44, slave_data); | |
231 | } else { /* Master */ | |
232 | master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY | |
233 | and master timing bits */ | |
234 | master_data |= control; | |
235 | master_data |= | |
236 | (timings[pio][0] << 12) | | |
237 | (timings[pio][1] << 8); | |
238 | } | |
239 | udma_enable &= ~(1 << devid); | |
240 | pci_write_config_word(dev, 0x40, master_data); | |
241 | } | |
242 | pci_write_config_byte(dev, 0x48, udma_enable); | |
243 | } | |
244 | ||
245 | static struct scsi_host_template it8213_sht = { | |
68d1d07b | 246 | ATA_BMDMA_SHT(DRV_NAME), |
9b13b682 AC |
247 | }; |
248 | ||
029cfd6b TH |
249 | |
250 | static struct ata_port_operations it8213_ops = { | |
251 | .inherits = &ata_bmdma_port_ops, | |
252 | .cable_detect = it8213_cable_detect, | |
9b13b682 AC |
253 | .set_piomode = it8213_set_piomode, |
254 | .set_dmamode = it8213_set_dmamode, | |
9b13b682 | 255 | .error_handler = it8213_error_handler, |
9b13b682 AC |
256 | }; |
257 | ||
258 | ||
259 | /** | |
260 | * it8213_init_one - Register 8213 ATA PCI device with kernel services | |
261 | * @pdev: PCI device to register | |
262 | * @ent: Entry in it8213_pci_tbl matching with @pdev | |
263 | * | |
264 | * Called from kernel PCI layer. | |
265 | * | |
266 | * LOCKING: | |
267 | * Inherited from PCI layer (may sleep). | |
268 | * | |
269 | * RETURNS: | |
270 | * Zero on success, or -ERRNO value. | |
271 | */ | |
272 | ||
273 | static int it8213_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) | |
274 | { | |
275 | static int printed_version; | |
1626aeb8 | 276 | static const struct ata_port_info info = { |
9b13b682 | 277 | .sht = &it8213_sht, |
1d2808fd | 278 | .flags = ATA_FLAG_SLAVE_POSS, |
9b13b682 AC |
279 | .pio_mask = 0x1f, /* pio0-4 */ |
280 | .mwdma_mask = 0x07, /* mwdma0-2 */ | |
bf6263a8 | 281 | .udma_mask = ATA_UDMA4, /* FIXME: want UDMA 100? */ |
9b13b682 AC |
282 | .port_ops = &it8213_ops, |
283 | }; | |
1626aeb8 TH |
284 | /* Current IT8213 stuff is single port */ |
285 | const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; | |
9b13b682 AC |
286 | |
287 | if (!printed_version++) | |
288 | dev_printk(KERN_DEBUG, &pdev->dev, | |
289 | "version " DRV_VERSION "\n"); | |
290 | ||
1626aeb8 | 291 | return ata_pci_init_one(pdev, ppi); |
9b13b682 AC |
292 | } |
293 | ||
294 | static const struct pci_device_id it8213_pci_tbl[] = { | |
295 | { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), }, | |
296 | ||
297 | { } /* terminate list */ | |
298 | }; | |
299 | ||
300 | static struct pci_driver it8213_pci_driver = { | |
301 | .name = DRV_NAME, | |
302 | .id_table = it8213_pci_tbl, | |
303 | .probe = it8213_init_one, | |
304 | .remove = ata_pci_remove_one, | |
438ac6d5 | 305 | #ifdef CONFIG_PM |
9b13b682 AC |
306 | .suspend = ata_pci_device_suspend, |
307 | .resume = ata_pci_device_resume, | |
438ac6d5 | 308 | #endif |
9b13b682 AC |
309 | }; |
310 | ||
311 | static int __init it8213_init(void) | |
312 | { | |
313 | return pci_register_driver(&it8213_pci_driver); | |
314 | } | |
315 | ||
316 | static void __exit it8213_exit(void) | |
317 | { | |
318 | pci_unregister_driver(&it8213_pci_driver); | |
319 | } | |
320 | ||
321 | module_init(it8213_init); | |
322 | module_exit(it8213_exit); | |
323 | ||
324 | MODULE_AUTHOR("Alan Cox"); | |
325 | MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213"); | |
326 | MODULE_LICENSE("GPL"); | |
327 | MODULE_DEVICE_TABLE(pci, it8213_pci_tbl); | |
328 | MODULE_VERSION(DRV_VERSION); |