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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; | |
29 | unsigned int wt, shwt; | |
30 | ||
31 | /* Minimum DIOx- active time */ | |
32 | wt = DIV_ROUND_UP(t->act8b, cycle) - 2; | |
33 | /* IORDY setup time: 35ns */ | |
34 | wt = max(wt, DIV_ROUND_UP(35, cycle)); | |
35 | /* actual wait-cycle is max(wt & ~1, 1) */ | |
36 | if (wt > 2 && (wt & 1)) | |
37 | wt++; | |
38 | wt &= ~1; | |
39 | /* Address-valid to DIOR/DIOW setup */ | |
40 | shwt = DIV_ROUND_UP(t->setup, cycle); | |
41 | ||
42 | pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n", | |
43 | ebus_ch, cycle, wt, shwt); | |
44 | ||
45 | __raw_writeq((cr & ~(0x3f007ull)) | (wt << 12) | shwt, | |
46 | &tx4938_ebuscptr->cr[ebus_ch]); | |
47 | } | |
48 | ||
49 | static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio) | |
50 | { | |
51 | ide_hwif_t *hwif = drive->hwif; | |
52 | struct tx4938ide_platform_info *pdata = hwif->dev->platform_data; | |
53 | u8 safe = pio; | |
54 | ide_drive_t *pair; | |
55 | ||
56 | pair = ide_get_pair_dev(drive); | |
57 | if (pair) | |
58 | safe = min(safe, ide_get_best_pio_mode(pair, 255, 5)); | |
59 | tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe); | |
60 | } | |
61 | ||
62 | #ifdef __BIG_ENDIAN | |
63 | ||
64 | /* custom iops (independent from SWAP_IO_SPACE) */ | |
65 | static u8 tx4938ide_inb(unsigned long port) | |
66 | { | |
67 | return __raw_readb((void __iomem *)port); | |
68 | } | |
69 | ||
70 | static void tx4938ide_outb(u8 value, unsigned long port) | |
71 | { | |
72 | __raw_writeb(value, (void __iomem *)port); | |
73 | } | |
74 | ||
75 | static void tx4938ide_tf_load(ide_drive_t *drive, ide_task_t *task) | |
76 | { | |
77 | ide_hwif_t *hwif = drive->hwif; | |
78 | struct ide_io_ports *io_ports = &hwif->io_ports; | |
79 | struct ide_taskfile *tf = &task->tf; | |
80 | u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF; | |
81 | ||
82 | if (task->tf_flags & IDE_TFLAG_FLAGGED) | |
83 | HIHI = 0xFF; | |
84 | ||
85 | if (task->tf_flags & IDE_TFLAG_OUT_DATA) { | |
86 | u16 data = (tf->hob_data << 8) | tf->data; | |
87 | ||
88 | /* no endian swap */ | |
89 | __raw_writew(data, (void __iomem *)io_ports->data_addr); | |
90 | } | |
91 | ||
92 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE) | |
93 | tx4938ide_outb(tf->hob_feature, io_ports->feature_addr); | |
94 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT) | |
95 | tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr); | |
96 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL) | |
97 | tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr); | |
98 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM) | |
99 | tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr); | |
100 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH) | |
101 | tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr); | |
102 | ||
103 | if (task->tf_flags & IDE_TFLAG_OUT_FEATURE) | |
104 | tx4938ide_outb(tf->feature, io_ports->feature_addr); | |
105 | if (task->tf_flags & IDE_TFLAG_OUT_NSECT) | |
106 | tx4938ide_outb(tf->nsect, io_ports->nsect_addr); | |
107 | if (task->tf_flags & IDE_TFLAG_OUT_LBAL) | |
108 | tx4938ide_outb(tf->lbal, io_ports->lbal_addr); | |
109 | if (task->tf_flags & IDE_TFLAG_OUT_LBAM) | |
110 | tx4938ide_outb(tf->lbam, io_ports->lbam_addr); | |
111 | if (task->tf_flags & IDE_TFLAG_OUT_LBAH) | |
112 | tx4938ide_outb(tf->lbah, io_ports->lbah_addr); | |
113 | ||
114 | if (task->tf_flags & IDE_TFLAG_OUT_DEVICE) | |
115 | tx4938ide_outb((tf->device & HIHI) | drive->select, | |
116 | io_ports->device_addr); | |
117 | } | |
118 | ||
119 | static void tx4938ide_tf_read(ide_drive_t *drive, ide_task_t *task) | |
120 | { | |
121 | ide_hwif_t *hwif = drive->hwif; | |
122 | struct ide_io_ports *io_ports = &hwif->io_ports; | |
123 | struct ide_taskfile *tf = &task->tf; | |
124 | ||
125 | if (task->tf_flags & IDE_TFLAG_IN_DATA) { | |
126 | u16 data; | |
127 | ||
128 | /* no endian swap */ | |
129 | data = __raw_readw((void __iomem *)io_ports->data_addr); | |
130 | tf->data = data & 0xff; | |
131 | tf->hob_data = (data >> 8) & 0xff; | |
132 | } | |
133 | ||
134 | /* be sure we're looking at the low order bits */ | |
135 | tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr); | |
136 | ||
137 | if (task->tf_flags & IDE_TFLAG_IN_FEATURE) | |
138 | tf->feature = tx4938ide_inb(io_ports->feature_addr); | |
139 | if (task->tf_flags & IDE_TFLAG_IN_NSECT) | |
140 | tf->nsect = tx4938ide_inb(io_ports->nsect_addr); | |
141 | if (task->tf_flags & IDE_TFLAG_IN_LBAL) | |
142 | tf->lbal = tx4938ide_inb(io_ports->lbal_addr); | |
143 | if (task->tf_flags & IDE_TFLAG_IN_LBAM) | |
144 | tf->lbam = tx4938ide_inb(io_ports->lbam_addr); | |
145 | if (task->tf_flags & IDE_TFLAG_IN_LBAH) | |
146 | tf->lbah = tx4938ide_inb(io_ports->lbah_addr); | |
147 | if (task->tf_flags & IDE_TFLAG_IN_DEVICE) | |
148 | tf->device = tx4938ide_inb(io_ports->device_addr); | |
149 | ||
150 | if (task->tf_flags & IDE_TFLAG_LBA48) { | |
151 | tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr); | |
152 | ||
153 | if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) | |
154 | tf->hob_feature = | |
155 | tx4938ide_inb(io_ports->feature_addr); | |
156 | if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT) | |
157 | tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr); | |
158 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL) | |
159 | tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr); | |
160 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM) | |
161 | tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr); | |
162 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH) | |
163 | tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr); | |
164 | } | |
165 | } | |
166 | ||
167 | static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq, | |
168 | void *buf, unsigned int len) | |
169 | { | |
170 | unsigned long port = drive->hwif->io_ports.data_addr; | |
171 | unsigned short *ptr = buf; | |
172 | unsigned int count = (len + 1) / 2; | |
173 | ||
174 | while (count--) | |
175 | *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port)); | |
176 | __ide_flush_dcache_range((unsigned long)buf, count * 2); | |
177 | } | |
178 | ||
179 | static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq, | |
180 | void *buf, unsigned int len) | |
181 | { | |
182 | unsigned long port = drive->hwif->io_ports.data_addr; | |
183 | unsigned short *ptr = buf; | |
184 | unsigned int count = (len + 1) / 2; | |
185 | ||
186 | while (count--) { | |
187 | __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port); | |
188 | ptr++; | |
189 | } | |
190 | __ide_flush_dcache_range((unsigned long)buf, count * 2); | |
191 | } | |
192 | ||
193 | static const struct ide_tp_ops tx4938ide_tp_ops = { | |
194 | .exec_command = ide_exec_command, | |
195 | .read_status = ide_read_status, | |
196 | .read_altstatus = ide_read_altstatus, | |
197 | .read_sff_dma_status = ide_read_sff_dma_status, | |
198 | ||
199 | .set_irq = ide_set_irq, | |
200 | ||
201 | .tf_load = tx4938ide_tf_load, | |
202 | .tf_read = tx4938ide_tf_read, | |
203 | ||
204 | .input_data = tx4938ide_input_data_swap, | |
205 | .output_data = tx4938ide_output_data_swap, | |
206 | }; | |
207 | ||
208 | #endif /* __BIG_ENDIAN */ | |
209 | ||
210 | static const struct ide_port_ops tx4938ide_port_ops = { | |
211 | .set_pio_mode = tx4938ide_set_pio_mode, | |
212 | }; | |
213 | ||
214 | static const struct ide_port_info tx4938ide_port_info __initdata = { | |
215 | .port_ops = &tx4938ide_port_ops, | |
216 | #ifdef __BIG_ENDIAN | |
217 | .tp_ops = &tx4938ide_tp_ops, | |
218 | #endif | |
219 | .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA, | |
220 | .pio_mask = ATA_PIO5, | |
221 | }; | |
222 | ||
223 | static int __init tx4938ide_probe(struct platform_device *pdev) | |
224 | { | |
225 | hw_regs_t hw; | |
226 | hw_regs_t *hws[] = { &hw, NULL, NULL, NULL }; | |
227 | struct ide_host *host; | |
228 | struct resource *res; | |
229 | struct tx4938ide_platform_info *pdata = pdev->dev.platform_data; | |
230 | int irq, ret, i; | |
231 | unsigned long mapbase; | |
232 | struct ide_port_info d = tx4938ide_port_info; | |
233 | ||
234 | irq = platform_get_irq(pdev, 0); | |
235 | if (irq < 0) | |
236 | return -ENODEV; | |
237 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
238 | if (!res) | |
239 | return -ENODEV; | |
240 | ||
241 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
242 | res->end - res->start + 1, "tx4938ide")) | |
243 | return -EBUSY; | |
244 | mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start, | |
245 | res->end - res->start + 1); | |
246 | if (!mapbase) | |
247 | return -EBUSY; | |
248 | ||
249 | memset(&hw, 0, sizeof(hw)); | |
250 | if (pdata->ioport_shift) { | |
251 | unsigned long port = mapbase; | |
252 | ||
253 | hw.io_ports_array[0] = port; | |
254 | #ifdef __BIG_ENDIAN | |
255 | port++; | |
256 | #endif | |
257 | for (i = 1; i <= 7; i++) | |
258 | hw.io_ports_array[i] = | |
259 | port + (i << pdata->ioport_shift); | |
260 | hw.io_ports.ctl_addr = | |
261 | port + 0x10000 + (6 << pdata->ioport_shift); | |
262 | } else | |
263 | ide_std_init_ports(&hw, mapbase, mapbase + 0x10006); | |
264 | hw.irq = irq; | |
265 | hw.dev = &pdev->dev; | |
266 | ||
267 | pr_info("TX4938 IDE interface (base %#lx, irq %d)\n", mapbase, hw.irq); | |
268 | if (pdata->gbus_clock) | |
269 | tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0); | |
270 | else | |
271 | d.port_ops = NULL; | |
272 | ret = ide_host_add(&d, hws, &host); | |
273 | if (ret) | |
274 | return ret; | |
275 | platform_set_drvdata(pdev, host); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static int __exit tx4938ide_remove(struct platform_device *pdev) | |
280 | { | |
281 | struct ide_host *host = platform_get_drvdata(pdev); | |
282 | ||
283 | ide_host_remove(host); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static struct platform_driver tx4938ide_driver = { | |
288 | .driver = { | |
289 | .name = "tx4938ide", | |
290 | .owner = THIS_MODULE, | |
291 | }, | |
292 | .remove = __exit_p(tx4938ide_remove), | |
293 | }; | |
294 | ||
295 | static int __init tx4938ide_init(void) | |
296 | { | |
297 | return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe); | |
298 | } | |
299 | ||
300 | static void __exit tx4938ide_exit(void) | |
301 | { | |
302 | platform_driver_unregister(&tx4938ide_driver); | |
303 | } | |
304 | ||
305 | module_init(tx4938ide_init); | |
306 | module_exit(tx4938ide_exit); | |
307 | ||
308 | MODULE_DESCRIPTION("TX4938 internal IDE driver"); | |
309 | MODULE_LICENSE("GPL"); | |
310 | MODULE_ALIAS("platform:tx4938ide"); |