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