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
tx4938ide_tune_ebusc(unsigned int ebus_ch,unsigned int gbus_clock,u8 pio)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 shwt;
30 int wt;
31
32 /* Minimum DIOx- active time */
33 wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
34 /* IORDY setup time: 35ns */
35 wt = max_t(int, wt, DIV_ROUND_UP(35, cycle));
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
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 }
50 pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
51 ebus_ch, cycle, wt, shwt);
52
53 __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
54 &tx4938_ebuscptr->cr[ebus_ch]);
55 }
56
tx4938ide_set_pio_mode(ide_drive_t * drive,const u8 pio)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) */
tx4938ide_inb(unsigned long port)73 static u8 tx4938ide_inb(unsigned long port)
74 {
75 return __raw_readb((void __iomem *)port);
76 }
77
tx4938ide_outb(u8 value,unsigned long port)78 static void tx4938ide_outb(u8 value, unsigned long port)
79 {
80 __raw_writeb(value, (void __iomem *)port);
81 }
82
tx4938ide_tf_load(ide_drive_t * drive,ide_task_t * task)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
tx4938ide_tf_read(ide_drive_t * drive,ide_task_t * task)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
tx4938ide_input_data_swap(ide_drive_t * drive,struct request * rq,void * buf,unsigned int len)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));
184 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
185 }
186
tx4938ide_output_data_swap(ide_drive_t * drive,struct request * rq,void * buf,unsigned int len)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 }
198 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
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,
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 = {
218 .set_pio_mode = tx4938ide_set_pio_mode,
219 };
220
221 static const struct ide_port_info tx4938ide_port_info __initdata = {
222 .port_ops = &tx4938ide_port_ops,
223 #ifdef __BIG_ENDIAN
224 .tp_ops = &tx4938ide_tp_ops,
225 #endif
226 .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
227 .pio_mask = ATA_PIO5,
228 .chipset = ide_generic,
229 };
230
tx4938ide_probe(struct platform_device * pdev)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;
239 unsigned long mapbase, mapctl;
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,
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)
259 return -EBUSY;
260
261 memset(&hw, 0, sizeof(hw));
262 if (pdata->ioport_shift) {
263 unsigned long port = mapbase;
264 unsigned long ctl = mapctl;
265
266 hw.io_ports_array[0] = port;
267 #ifdef __BIG_ENDIAN
268 port++;
269 ctl++;
270 #endif
271 for (i = 1; i <= 7; i++)
272 hw.io_ports_array[i] =
273 port + (i << pdata->ioport_shift);
274 hw.io_ports.ctl_addr = ctl;
275 } else
276 ide_std_init_ports(&hw, mapbase, mapctl);
277 hw.irq = irq;
278 hw.dev = &pdev->dev;
279
280 pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
281 mapbase, mapctl, hw.irq);
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);
287 if (!ret)
288 platform_set_drvdata(pdev, host);
289 return ret;
290 }
291
tx4938ide_remove(struct platform_device * pdev)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
tx4938ide_init(void)308 static int __init tx4938ide_init(void)
309 {
310 return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
311 }
312
tx4938ide_exit(void)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");
324