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28502848 AN |
1 | /* |
2 | * TX4938 internal IDE driver | |
3 | * Based on tx4939ide.c. | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | * | |
9 | * (C) Copyright TOSHIBA CORPORATION 2005-2007 | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/ide.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/io.h> | |
15a453a9 BZ |
18 | |
19 | #include <asm/ide.h> | |
28502848 AN |
20 | #include <asm/txx9/tx4938.h> |
21 | ||
22 | static void tx4938ide_tune_ebusc(unsigned int ebus_ch, | |
23 | unsigned int gbus_clock, | |
24 | u8 pio) | |
25 | { | |
26 | struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio); | |
27 | u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]); | |
28 | unsigned int sp = (cr >> 4) & 3; | |
29 | unsigned int clock = gbus_clock / (4 - sp); | |
30 | unsigned int cycle = 1000000000 / clock; | |
7afa0535 AN |
31 | unsigned int shwt; |
32 | int wt; | |
28502848 AN |
33 | |
34 | /* Minimum DIOx- active time */ | |
35 | wt = DIV_ROUND_UP(t->act8b, cycle) - 2; | |
36 | /* IORDY setup time: 35ns */ | |
7afa0535 | 37 | wt = max_t(int, wt, DIV_ROUND_UP(35, cycle)); |
28502848 AN |
38 | /* actual wait-cycle is max(wt & ~1, 1) */ |
39 | if (wt > 2 && (wt & 1)) | |
40 | wt++; | |
41 | wt &= ~1; | |
42 | /* Address-valid to DIOR/DIOW setup */ | |
43 | shwt = DIV_ROUND_UP(t->setup, cycle); | |
44 | ||
630a8b25 AN |
45 | /* -DIOx recovery time (SHWT * 4) and cycle time requirement */ |
46 | while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle) | |
47 | shwt++; | |
48 | if (shwt > 7) { | |
49 | pr_warning("tx4938ide: SHWT violation (%d)\n", shwt); | |
50 | shwt = 7; | |
51 | } | |
28502848 AN |
52 | pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n", |
53 | ebus_ch, cycle, wt, shwt); | |
54 | ||
630a8b25 | 55 | __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt, |
28502848 AN |
56 | &tx4938_ebuscptr->cr[ebus_ch]); |
57 | } | |
58 | ||
59 | static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio) | |
60 | { | |
61 | ide_hwif_t *hwif = drive->hwif; | |
62 | struct tx4938ide_platform_info *pdata = hwif->dev->platform_data; | |
63 | u8 safe = pio; | |
64 | ide_drive_t *pair; | |
65 | ||
66 | pair = ide_get_pair_dev(drive); | |
67 | if (pair) | |
68 | safe = min(safe, ide_get_best_pio_mode(pair, 255, 5)); | |
69 | tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe); | |
70 | } | |
71 | ||
72 | #ifdef __BIG_ENDIAN | |
73 | ||
74 | /* custom iops (independent from SWAP_IO_SPACE) */ | |
75 | static u8 tx4938ide_inb(unsigned long port) | |
76 | { | |
77 | return __raw_readb((void __iomem *)port); | |
78 | } | |
79 | ||
80 | static void tx4938ide_outb(u8 value, unsigned long port) | |
81 | { | |
82 | __raw_writeb(value, (void __iomem *)port); | |
83 | } | |
84 | ||
85 | static void tx4938ide_tf_load(ide_drive_t *drive, ide_task_t *task) | |
86 | { | |
87 | ide_hwif_t *hwif = drive->hwif; | |
88 | struct ide_io_ports *io_ports = &hwif->io_ports; | |
89 | struct ide_taskfile *tf = &task->tf; | |
90 | u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF; | |
91 | ||
92 | if (task->tf_flags & IDE_TFLAG_FLAGGED) | |
93 | HIHI = 0xFF; | |
94 | ||
95 | if (task->tf_flags & IDE_TFLAG_OUT_DATA) { | |
96 | u16 data = (tf->hob_data << 8) | tf->data; | |
97 | ||
98 | /* no endian swap */ | |
99 | __raw_writew(data, (void __iomem *)io_ports->data_addr); | |
100 | } | |
101 | ||
102 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE) | |
103 | tx4938ide_outb(tf->hob_feature, io_ports->feature_addr); | |
104 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT) | |
105 | tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr); | |
106 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL) | |
107 | tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr); | |
108 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM) | |
109 | tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr); | |
110 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH) | |
111 | tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr); | |
112 | ||
113 | if (task->tf_flags & IDE_TFLAG_OUT_FEATURE) | |
114 | tx4938ide_outb(tf->feature, io_ports->feature_addr); | |
115 | if (task->tf_flags & IDE_TFLAG_OUT_NSECT) | |
116 | tx4938ide_outb(tf->nsect, io_ports->nsect_addr); | |
117 | if (task->tf_flags & IDE_TFLAG_OUT_LBAL) | |
118 | tx4938ide_outb(tf->lbal, io_ports->lbal_addr); | |
119 | if (task->tf_flags & IDE_TFLAG_OUT_LBAM) | |
120 | tx4938ide_outb(tf->lbam, io_ports->lbam_addr); | |
121 | if (task->tf_flags & IDE_TFLAG_OUT_LBAH) | |
122 | tx4938ide_outb(tf->lbah, io_ports->lbah_addr); | |
123 | ||
124 | if (task->tf_flags & IDE_TFLAG_OUT_DEVICE) | |
125 | tx4938ide_outb((tf->device & HIHI) | drive->select, | |
126 | io_ports->device_addr); | |
127 | } | |
128 | ||
129 | static void tx4938ide_tf_read(ide_drive_t *drive, ide_task_t *task) | |
130 | { | |
131 | ide_hwif_t *hwif = drive->hwif; | |
132 | struct ide_io_ports *io_ports = &hwif->io_ports; | |
133 | struct ide_taskfile *tf = &task->tf; | |
134 | ||
135 | if (task->tf_flags & IDE_TFLAG_IN_DATA) { | |
136 | u16 data; | |
137 | ||
138 | /* no endian swap */ | |
139 | data = __raw_readw((void __iomem *)io_ports->data_addr); | |
140 | tf->data = data & 0xff; | |
141 | tf->hob_data = (data >> 8) & 0xff; | |
142 | } | |
143 | ||
144 | /* be sure we're looking at the low order bits */ | |
145 | tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr); | |
146 | ||
147 | if (task->tf_flags & IDE_TFLAG_IN_FEATURE) | |
148 | tf->feature = tx4938ide_inb(io_ports->feature_addr); | |
149 | if (task->tf_flags & IDE_TFLAG_IN_NSECT) | |
150 | tf->nsect = tx4938ide_inb(io_ports->nsect_addr); | |
151 | if (task->tf_flags & IDE_TFLAG_IN_LBAL) | |
152 | tf->lbal = tx4938ide_inb(io_ports->lbal_addr); | |
153 | if (task->tf_flags & IDE_TFLAG_IN_LBAM) | |
154 | tf->lbam = tx4938ide_inb(io_ports->lbam_addr); | |
155 | if (task->tf_flags & IDE_TFLAG_IN_LBAH) | |
156 | tf->lbah = tx4938ide_inb(io_ports->lbah_addr); | |
157 | if (task->tf_flags & IDE_TFLAG_IN_DEVICE) | |
158 | tf->device = tx4938ide_inb(io_ports->device_addr); | |
159 | ||
160 | if (task->tf_flags & IDE_TFLAG_LBA48) { | |
161 | tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr); | |
162 | ||
163 | if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) | |
164 | tf->hob_feature = | |
165 | tx4938ide_inb(io_ports->feature_addr); | |
166 | if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT) | |
167 | tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr); | |
168 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL) | |
169 | tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr); | |
170 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM) | |
171 | tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr); | |
172 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH) | |
173 | tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr); | |
174 | } | |
175 | } | |
176 | ||
177 | static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq, | |
178 | void *buf, unsigned int len) | |
179 | { | |
180 | unsigned long port = drive->hwif->io_ports.data_addr; | |
181 | unsigned short *ptr = buf; | |
182 | unsigned int count = (len + 1) / 2; | |
183 | ||
184 | while (count--) | |
185 | *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port)); | |
f26f6cea | 186 | __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); |
28502848 AN |
187 | } |
188 | ||
189 | static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq, | |
190 | void *buf, unsigned int len) | |
191 | { | |
192 | unsigned long port = drive->hwif->io_ports.data_addr; | |
193 | unsigned short *ptr = buf; | |
194 | unsigned int count = (len + 1) / 2; | |
195 | ||
196 | while (count--) { | |
197 | __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port); | |
198 | ptr++; | |
199 | } | |
f26f6cea | 200 | __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); |
28502848 AN |
201 | } |
202 | ||
203 | static const struct ide_tp_ops tx4938ide_tp_ops = { | |
204 | .exec_command = ide_exec_command, | |
205 | .read_status = ide_read_status, | |
206 | .read_altstatus = ide_read_altstatus, | |
28502848 AN |
207 | |
208 | .set_irq = ide_set_irq, | |
209 | ||
210 | .tf_load = tx4938ide_tf_load, | |
211 | .tf_read = tx4938ide_tf_read, | |
212 | ||
213 | .input_data = tx4938ide_input_data_swap, | |
214 | .output_data = tx4938ide_output_data_swap, | |
215 | }; | |
216 | ||
217 | #endif /* __BIG_ENDIAN */ | |
218 | ||
219 | static const struct ide_port_ops tx4938ide_port_ops = { | |
3ee86dcd | 220 | .set_pio_mode = tx4938ide_set_pio_mode, |
28502848 AN |
221 | }; |
222 | ||
223 | static const struct ide_port_info tx4938ide_port_info __initdata = { | |
3ee86dcd | 224 | .port_ops = &tx4938ide_port_ops, |
28502848 | 225 | #ifdef __BIG_ENDIAN |
3ee86dcd | 226 | .tp_ops = &tx4938ide_tp_ops, |
28502848 | 227 | #endif |
3ee86dcd BZ |
228 | .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA, |
229 | .pio_mask = ATA_PIO5, | |
b1d249e8 | 230 | .chipset = ide_generic, |
28502848 AN |
231 | }; |
232 | ||
233 | static int __init tx4938ide_probe(struct platform_device *pdev) | |
234 | { | |
235 | hw_regs_t hw; | |
236 | hw_regs_t *hws[] = { &hw, NULL, NULL, NULL }; | |
237 | struct ide_host *host; | |
238 | struct resource *res; | |
239 | struct tx4938ide_platform_info *pdata = pdev->dev.platform_data; | |
240 | int irq, ret, i; | |
9d4eb0a3 | 241 | unsigned long mapbase, mapctl; |
28502848 AN |
242 | struct ide_port_info d = tx4938ide_port_info; |
243 | ||
244 | irq = platform_get_irq(pdev, 0); | |
245 | if (irq < 0) | |
246 | return -ENODEV; | |
247 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
248 | if (!res) | |
249 | return -ENODEV; | |
250 | ||
251 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
252 | res->end - res->start + 1, "tx4938ide")) | |
253 | return -EBUSY; | |
254 | mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start, | |
9d4eb0a3 AN |
255 | 8 << pdata->ioport_shift); |
256 | mapctl = (unsigned long)devm_ioremap(&pdev->dev, | |
257 | res->start + 0x10000 + | |
258 | (6 << pdata->ioport_shift), | |
259 | 1 << pdata->ioport_shift); | |
260 | if (!mapbase || !mapctl) | |
28502848 AN |
261 | return -EBUSY; |
262 | ||
263 | memset(&hw, 0, sizeof(hw)); | |
264 | if (pdata->ioport_shift) { | |
265 | unsigned long port = mapbase; | |
9d4eb0a3 | 266 | unsigned long ctl = mapctl; |
28502848 AN |
267 | |
268 | hw.io_ports_array[0] = port; | |
269 | #ifdef __BIG_ENDIAN | |
270 | port++; | |
9d4eb0a3 | 271 | ctl++; |
28502848 AN |
272 | #endif |
273 | for (i = 1; i <= 7; i++) | |
274 | hw.io_ports_array[i] = | |
275 | port + (i << pdata->ioport_shift); | |
9d4eb0a3 | 276 | hw.io_ports.ctl_addr = ctl; |
28502848 | 277 | } else |
9d4eb0a3 | 278 | ide_std_init_ports(&hw, mapbase, mapctl); |
28502848 AN |
279 | hw.irq = irq; |
280 | hw.dev = &pdev->dev; | |
281 | ||
9d4eb0a3 AN |
282 | pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n", |
283 | mapbase, mapctl, hw.irq); | |
28502848 AN |
284 | if (pdata->gbus_clock) |
285 | tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0); | |
286 | else | |
287 | d.port_ops = NULL; | |
288 | ret = ide_host_add(&d, hws, &host); | |
9d4eb0a3 AN |
289 | if (!ret) |
290 | platform_set_drvdata(pdev, host); | |
291 | return ret; | |
28502848 AN |
292 | } |
293 | ||
294 | static int __exit tx4938ide_remove(struct platform_device *pdev) | |
295 | { | |
296 | struct ide_host *host = platform_get_drvdata(pdev); | |
297 | ||
298 | ide_host_remove(host); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static struct platform_driver tx4938ide_driver = { | |
303 | .driver = { | |
304 | .name = "tx4938ide", | |
305 | .owner = THIS_MODULE, | |
306 | }, | |
307 | .remove = __exit_p(tx4938ide_remove), | |
308 | }; | |
309 | ||
310 | static int __init tx4938ide_init(void) | |
311 | { | |
312 | return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe); | |
313 | } | |
314 | ||
315 | static void __exit tx4938ide_exit(void) | |
316 | { | |
317 | platform_driver_unregister(&tx4938ide_driver); | |
318 | } | |
319 | ||
320 | module_init(tx4938ide_init); | |
321 | module_exit(tx4938ide_exit); | |
322 | ||
323 | MODULE_DESCRIPTION("TX4938 internal IDE driver"); | |
324 | MODULE_LICENSE("GPL"); | |
325 | MODULE_ALIAS("platform:tx4938ide"); |