Subversion Repositories freemyipod

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
301 theseven 1 
/***************************************************************************
2 
 *             __________               __   ___.
3 
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
4 
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
5 
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
6 
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
7 
 *                     \/            \/     \/    \/            \/
8 
 * $Id$
9 
 *
10 
 * Copyright (C) 2007 Dave Chapman
11 
 *
12 
 * This program is free software; you can redistribute it and/or
13 
 * modify it under the terms of the GNU General Public License
14 
 * as published by the Free Software Foundation; either version 2
15 
 * of the License, or (at your option) any later version.
16 
 *
17 
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 
 * KIND, either express or implied.
19 
 *
20 
 ****************************************************************************/
21 
#include "global.h"
22 
#include "thread.h"
23 
#include "disk.h"
24 
#include "storage.h"
339 theseven 25 
#include "storage_ata-target.h"
301 theseven 26 
#include "timer.h"
27 
#include "../ipodnano3g/s5l8702.h"
28 
 
29 
/** static, private data **/
30 
uint16_t ata_identify_data[0x100];
31 
bool ata_lba48;
32 
bool ata_dma;
33 
uint64_t ata_total_sectors;
34 
static struct mutex ata_mutex;
35 
static struct wakeup ata_wakeup;
36 
static uint32_t ata_dma_flags;
37 
static long ata_last_activity_value = -1;
38 
static long ata_sleep_timeout = 20000000;
39 
static uint32_t ata_stack[0x80];
40 
static bool ata_powered;
41 
 
328 theseven 42 
#ifdef ATA_HAVE_BBT
43 
#include "panic.h"
44 
uint16_t ata_bbt[ATA_BBT_PAGES][0x20];
339 theseven 45 
uint64_t ata_virtual_sectors;
337 theseven 46 
uint32_t ata_last_offset;
47 
uint64_t ata_last_phys;
301 theseven 48 
 
328 theseven 49 
void ata_bbt_read_sectors(uint32_t sector, uint32_t count, void* buffer)
50 
{
51 
    int rc = ata_rw_sectors_internal(sector, count, buffer, false);
52 
    if (IS_ERR(rc))
53 
        panicf(PANIC_KILLTHREAD, "ATA: Error %08X while reading BBT (sector %d, count %d)\n",
54 
               rc, sector, count);
55 
}
56 
#endif
57 
 
58 
 
301 theseven 59 
static uint16_t ata_read_cbr(uint32_t volatile* reg)
60 
{
317 theseven 61 
    while (!(ATA_PIO_READY & 2)) yield();
301 theseven 62 
    volatile uint32_t dummy = *reg;
317 theseven 63 
    while (!(ATA_PIO_READY & 1)) yield();
301 theseven 64 
    return ATA_PIO_RDATA;
65 
}
66 
 
67 
static void ata_write_cbr(uint32_t volatile* reg, uint16_t data)
68 
{
317 theseven 69 
    while (!(ATA_PIO_READY & 2)) yield();
301 theseven 70 
    *reg = data;
71 
}
72 
 
73 
static int ata_wait_for_not_bsy(long timeout)
74 
{
75 
    long startusec = USEC_TIMER;
76 
    while (true)
77 
    {
78 
        uint8_t csd = ata_read_cbr(&ATA_PIO_CSD);
79 
        if (!(csd & BIT(7))) return 0;
80 
        if (TIMEOUT_EXPIRED(startusec, timeout)) RET_ERR(0);
81 
    }
82 
}
83 
 
84 
static int ata_wait_for_rdy(long timeout)
85 
{
86 
    long startusec = USEC_TIMER;
87 
    PASS_RC(ata_wait_for_not_bsy(timeout), 1, 0);
88 
    while (true)
89 
    {
90 
        uint8_t dad = ata_read_cbr(&ATA_PIO_DAD);
91 
        if (dad & BIT(6)) return 0;
92 
        if (TIMEOUT_EXPIRED(startusec, timeout)) RET_ERR(1);
93 
    }
94 
}
95 
 
96 
static int ata_wait_for_start_of_transfer(long timeout)
97 
{
98 
    long startusec = USEC_TIMER;
99 
    PASS_RC(ata_wait_for_not_bsy(timeout), 2, 0);
100 
    while (true)
101 
    {
102 
        uint8_t dad = ata_read_cbr(&ATA_PIO_DAD);
103 
        if (dad & BIT(0)) RET_ERR(1);
104 
        if ((dad & (BIT(7) | BIT(3))) == BIT(3)) return 0;
105 
        if (TIMEOUT_EXPIRED(startusec, timeout)) RET_ERR(2);
106 
    }
107 
}
108 
 
109 
static int ata_wait_for_end_of_transfer(long timeout)
110 
{
111 
    PASS_RC(ata_wait_for_not_bsy(timeout), 2, 0);
112 
    uint8_t dad = ata_read_cbr(&ATA_PIO_DAD);
113 
    if (dad & BIT(0)) RET_ERR(1);
114 
    if ((dad & (BIT(3) | BITRANGE(5, 7))) == BIT(6)) return 0;
115 
    RET_ERR(2);
116 
}
117 
 
118 
int ata_identify(uint16_t* buf)
119 
{
120 
    int i;
121 
    PASS_RC(ata_wait_for_not_bsy(10000000), 1, 0);
122 
    ata_write_cbr(&ATA_PIO_DVR, 0);
123 
    ata_write_cbr(&ATA_PIO_CSD, 0xec);
124 
    PASS_RC(ata_wait_for_start_of_transfer(10000000), 1, 1);
125 
    for (i = 0; i < 0x100; i++)
126 
    {
127 
        uint16_t word = ata_read_cbr(&ATA_PIO_DTR);
128 
        buf[i] = (word >> 8) | (word << 8);
129 
    }
130 
}
131 
 
132 
void ata_set_active(void)
133 
{
134 
    ata_last_activity_value = USEC_TIMER;
135 
}
136 
 
317 theseven 137 
int ata_set_feature(uint32_t feature, uint32_t param)
138 
{
139 
    PASS_RC(ata_wait_for_rdy(500000), 1, 0);
140 
    ata_write_cbr(&ATA_PIO_DVR, 0);
141 
    ata_write_cbr(&ATA_PIO_FED, 3);
142 
    ata_write_cbr(&ATA_PIO_SCR, param);
143 
    ata_write_cbr(&ATA_PIO_CSD, feature);
144 
    PASS_RC(ata_wait_for_rdy(500000), 1, 1);
145 
    return 0;
146 
}
147 
 
301 theseven 148 
int ata_power_up()
149 
{
150 
    ata_set_active();
357 theseven 151 
    if (ata_powered) return 0;
301 theseven 152 
    i2c_sendbyte(0, 0xe6, 0x1b, 1);
153 
    clockgate_enable(5, true);
154 
    ATA_CFG = BIT(0);
155 
    sleep(1000);
156 
    ATA_CFG = 0;
157 
    sleep(6000);
158 
    ATA_SWRST = BIT(0);
159 
    sleep(500);
160 
    ATA_SWRST = 0;
161 
    sleep(90000);
162 
    ATA_CONTROL = BIT(0);
163 
    sleep(200000);
164 
    ATA_PIO_TIME = 0x191f7;
165 
    ATA_PIO_LHR = 0;
166 
    while (!(ATA_PIO_READY & BIT(1))) sleep(100);
167 
    PASS_RC(ata_identify(ata_identify_data), 2, 0);
168 
    uint32_t piotime = 0x11f3;
169 
    uint32_t mdmatime = 0x1c175;
170 
    uint32_t udmatime = 0x5071152;
171 
    uint32_t param = 0;
172 
    ata_dma_flags = 0;
173 
    ata_lba48 = ata_identify_data[83] & BIT(10) ? true : false;
174 
    if (ata_lba48)
175 
        ata_total_sectors = ata_identify_data[100]
176 
                          | (((uint64_t)ata_identify_data[101]) << 16)
177 
                          | (((uint64_t)ata_identify_data[102]) << 32)
178 
                          | (((uint64_t)ata_identify_data[103]) << 48);
179 
    else ata_total_sectors = ata_identify_data[60] | (((uint32_t)ata_identify_data[61]) << 16);
328 theseven 180 
    ata_total_sectors >>= 3;
301 theseven 181 
    if (ata_identify_data[53] & BIT(1))
182 
    {
183 
        if (ata_identify_data[64] & BIT(1)) piotime = 0x2072;
184 
        else if (ata_identify_data[64] & BIT(0)) piotime = 0x7083;
185 
    }
186 
    if (ata_identify_data[63] & BIT(2))
187 
    {
188 
        mdmatime = 0x5072;
189 
        param = 0x22;
190 
    }
191 
    else if (ata_identify_data[63] & BIT(1))
192 
    {
193 
        mdmatime = 0x7083;
194 
        param = 0x21;
195 
    }
196 
    if (ata_identify_data[63] & BITRANGE(0, 2))
197 
    {
198 
        ata_dma_flags = BIT(3) | BIT(10);
199 
        param |= 0x20;
200 
    }
201 
    if (ata_identify_data[53] & BIT(2))
202 
    {
203 
        if (ata_identify_data[88] & BIT(4))
204 
        {
205 
            udmatime = 0x2010a52;
206 
            param = 0x44;
207 
        }
208 
        else if (ata_identify_data[88] & BIT(3))
209 
        {
210 
            udmatime = 0x2020a52;
211 
            param = 0x43;
212 
        }
213 
        else if (ata_identify_data[88] & BIT(2))
214 
        {
215 
            udmatime = 0x3030a52;
216 
            param = 0x42;
217 
        }
218 
        else if (ata_identify_data[88] & BIT(1))
219 
        {
220 
            udmatime = 0x3050a52;
221 
            param = 0x41;
222 
        }
223 
        if (ata_identify_data[88] & BITRANGE(0, 4))
224 
        {
225 
            ata_dma_flags = BIT(2) | BIT(3) | BIT(9) | BIT(10);
226 
            param |= 0x40;
227 
        }
228 
    }
229 
    ata_dma = param ? true : false;
317 theseven 230 
    PASS_RC(ata_set_feature(0xef, param), 2, 1);
337 theseven 231 
    if (ata_identify_data[82] & BIT(5)) PASS_RC(ata_set_feature(0x02, 0), 2, 2);
232 
    if (ata_identify_data[82] & BIT(6)) PASS_RC(ata_set_feature(0x55, 0), 2, 3);
301 theseven 233 
    ATA_PIO_TIME = piotime;
234 
    ATA_MDMA_TIME = mdmatime;
235 
    ATA_UDMA_TIME = udmatime;
236 
    ata_powered = true;
237 
    ata_set_active();
238 
    return 0;
239 
}
240 
 
241 
void ata_power_down()
242 
{
357 theseven 243 
    if (!ata_powered) return;
301 theseven 244 
    ata_powered = false;
245 
    ata_wait_for_rdy(1000000);
246 
    ata_write_cbr(&ATA_PIO_DVR, 0);
247 
    ata_write_cbr(&ATA_PIO_CSD, 0xe0);
248 
    ata_wait_for_rdy(1000000);
249 
    sleep(30000);
250 
    ATA_CONTROL = 0;
317 theseven 251 
    while (!(ATA_CONTROL & BIT(1))) yield();
301 theseven 252 
    clockgate_enable(5, false);
253 
    i2c_sendbyte(0, 0xe6, 0x1b, 0);
254 
}
255 
 
337 theseven 256 
int ata_rw_chunk(uint64_t sector, uint32_t cnt, void* buffer, bool write)
257 
{
258 
    PASS_RC(ata_wait_for_rdy(100000), 2, 0);
259 
    ata_write_cbr(&ATA_PIO_DVR, 0);
260 
    if (ata_lba48)
261 
    {
262 
        ata_write_cbr(&ATA_PIO_SCR, cnt >> 5);
263 
        ata_write_cbr(&ATA_PIO_SCR, (cnt << 3) & 0xff);
264 
        ata_write_cbr(&ATA_PIO_LHR, (sector >> 37) & 0xff);
265 
        ata_write_cbr(&ATA_PIO_LMR, (sector >> 29) & 0xff);
266 
        ata_write_cbr(&ATA_PIO_LLR, (sector >> 21) & 0xff);
267 
        ata_write_cbr(&ATA_PIO_LHR, (sector >> 13) & 0xff);
268 
        ata_write_cbr(&ATA_PIO_LMR, (sector >> 5) & 0xff);
269 
        ata_write_cbr(&ATA_PIO_LLR, (sector << 3) & 0xff);
270 
        ata_write_cbr(&ATA_PIO_DVR, BIT(6));
271 
        if (write) ata_write_cbr(&ATA_PIO_CSD, ata_dma ? 0x35 : 0x39);
272 
        else ata_write_cbr(&ATA_PIO_CSD, ata_dma ? 0x25 : 0x29);
273 
    }
274 
    else
275 
    {
276 
        ata_write_cbr(&ATA_PIO_SCR, (cnt << 3) & 0xff);
277 
        ata_write_cbr(&ATA_PIO_LHR, (sector >> 13) & 0xff);
278 
        ata_write_cbr(&ATA_PIO_LMR, (sector >> 5) & 0xff);
279 
        ata_write_cbr(&ATA_PIO_LLR, (sector << 3) & 0xff);
280 
        ata_write_cbr(&ATA_PIO_DVR, BIT(6) | ((sector >> 21) & 0xf));
281 
        if (write) ata_write_cbr(&ATA_PIO_CSD, ata_dma ? 0xca : 0x30);
282 
        else ata_write_cbr(&ATA_PIO_CSD, ata_dma ? 0xc8 : 0xc4);
283 
    }
284 
    if (ata_dma)
285 
    {
286 
        PASS_RC(ata_wait_for_start_of_transfer(500000), 2, 1);
287 
        if (write)
288 
        {
289 
            ATA_SBUF_START = buffer;
290 
            ATA_SBUF_SIZE = SECTOR_SIZE * cnt;
291 
            ATA_CFG |= BIT(4);
292 
        }
293 
        else
294 
        {
295 
            ATA_TBUF_START = buffer;
296 
            ATA_TBUF_SIZE = SECTOR_SIZE * cnt;
297 
            ATA_CFG &= ~BIT(4);
298 
        }
299 
        ATA_XFR_NUM = SECTOR_SIZE * cnt - 1;
300 
        ATA_CFG |= ata_dma_flags;
301 
        ATA_CFG &= ~(BIT(7) | BIT(8));
302 
        wakeup_wait(&ata_wakeup, TIMEOUT_NONE);
303 
        ATA_IRQ = BITRANGE(0, 4);
304 
        ATA_IRQ_MASK = BIT(0);
305 
        ATA_COMMAND = BIT(0);
306 
        if (wakeup_wait(&ata_wakeup, 500000) == THREAD_TIMEOUT)
307 
        {
308 
            ATA_COMMAND = BIT(1);
309 
            ATA_CFG &= ~(BITRANGE(2, 3) | BIT(12));
310 
            RET_ERR(2);
311 
        }
312 
        ATA_COMMAND = BIT(1);
313 
        ATA_CFG &= ~(BITRANGE(2, 3) | BIT(12));
314 
    }
315 
    else
316 
    {
317 
        cnt *= SECTOR_SIZE / 512;
318 
        while (cnt--)
319 
        {
320 
            int i;
321 
            PASS_RC(ata_wait_for_start_of_transfer(500000), 2, 1);
322 
            if (write)
323 
                for (i = 0; i < 256; i++)
324 
                    ata_write_cbr(&ATA_PIO_DTR, ((uint16_t*)buffer)[i]);
325 
            else
326 
                for (i = 0; i < 256; i++)
327 
                    ((uint16_t*)buffer)[i] = ata_read_cbr(&ATA_PIO_DTR);
328 
            buffer += 512;
329 
        }
330 
    }
331 
    PASS_RC(ata_wait_for_end_of_transfer(100000), 2, 3);
332 
    return 0;
333 
}
334 
 
301 theseven 335 
int ata_rw_sectors(uint64_t sector, uint32_t count, void* buffer, bool write)
336 
{
328 theseven 337 
#ifdef ATA_HAVE_BBT
338 
    if (sector + count > ata_virtual_sectors) RET_ERR(0);
339 
    while (count)
340 
    {
337 theseven 341 
        uint32_t offset;
328 theseven 342 
        uint32_t l0idx = sector >> 15;
343 
        uint32_t l0offs = sector & 0x7fff;
344 
        uint32_t cnt = MIN(count, 0x8000 - l0offs);
345 
        uint32_t l0data = ata_bbt[0][l0idx << 1];
346 
        uint32_t base = ata_bbt[0][(l0idx << 1) | 1] << 12;
337 theseven 347 
        if (l0data < 0x8000) offset = l0data + base;
328 theseven 348 
        else
349 
        {
350 
            uint32_t l1idx = (sector >> 10) & 0x1f;
351 
            uint32_t l1offs = sector & 0x3ff;
352 
            cnt = MIN(count, 0x400 - l1offs);
353 
            uint32_t l1data = ata_bbt[l0data & 0x7fff][l1idx];
337 theseven 354 
            if (l1data < 0x8000) offset = l1data + base;
328 theseven 355 
            else
356 
            {
357 
                uint32_t l2idx = (sector >> 5) & 0x1f;
358 
                uint32_t l2offs = sector & 0x1f;
359 
                cnt = MIN(count, 0x20 - l2offs);
360 
                uint32_t l2data = ata_bbt[l1data & 0x7fff][l2idx];
337 theseven 361 
                if (l2data < 0x8000) offset = l2data + base;
328 theseven 362 
                else
363 
                {
364 
                    uint32_t l3idx = sector & 0x1f;
337 theseven 365 
                    uint32_t l3data = ata_bbt[l2data & 0x7fff][l3idx];
328 theseven 366 
                    for (cnt = 1; cnt < count && l3idx + cnt < 0x20; cnt++)
337 theseven 367 
                        if (ata_bbt[l2data & 0x7fff][l3idx + cnt] != l3data)
328 theseven 368 
                            break;
337 theseven 369 
                    offset = l3data + base;
328 theseven 370 
                }
371 
            }
372 
        }
337 theseven 373 
        uint64_t phys = sector + offset;
374 
        if (offset != ata_last_offset && phys - ata_last_phys < 64) ata_soft_reset();
375 
        ata_last_offset = offset;
376 
        ata_last_phys = phys + cnt;
328 theseven 377 
        PASS_RC(ata_rw_sectors_internal(phys, cnt, buffer, write), 0, 0);
378 
        buffer += cnt * SECTOR_SIZE;
379 
        sector += cnt;
380 
        count -= cnt;
381 
    }
382 
    return 0;
383 
}
384 
 
385 
int ata_rw_sectors_internal(uint64_t sector, uint32_t count, void* buffer, bool write)
386 
{
387 
#endif
301 theseven 388 
    if (sector + count > ata_total_sectors) RET_ERR(0);
389 
    if (!ata_powered) ata_power_up();
390 
    ata_set_active();
391 
    if (ata_dma && write) clean_dcache();
392 
    else if (ata_dma) invalidate_dcache();
393 
    ATA_COMMAND = BIT(1);
394 
    while (count)
395 
    {
317 theseven 396 
        uint32_t cnt = MIN(ata_lba48 ? 8192 : 32, count);
337 theseven 397 
        int rc = -1;
398 
        int tries = 3;
399 
        while (tries-- && rc)
301 theseven 400 
        {
337 theseven 401 
            rc = ata_rw_chunk(sector, cnt, buffer, write);
402 
            if (rc) ata_soft_reset();
301 theseven 403 
        }
337 theseven 404 
        if (rc)
301 theseven 405 
        {
337 theseven 406 
            void* buf = buffer;
405 theseven 407 
            uint64_t sect;
337 theseven 408 
            for (sect = sector; sect < sector + cnt; sect++)
409 
            {
410 
                rc = -1;
411 
                tries = 3;
412 
                while (tries-- && rc)
413 
                {
414 
                    rc = ata_rw_chunk(sect, 1, buf, write);
415 
                    if (rc) ata_soft_reset();
416 
                }
417 
                if (rc) break;
418 
                buf += SECTOR_SIZE;
419 
            }
301 theseven 420 
        }
337 theseven 421 
        PASS_RC(rc, 1, 1);
422 
        buffer += SECTOR_SIZE * cnt;
301 theseven 423 
        sector += cnt;
424 
        count -= cnt;
425 
    }
426 
    ata_set_active();
427 
    return 0;
428 
}
429 
 
430 
static void ata_thread(void)
431 
{
432 
    while (true)
433 
    {
434 
        mutex_lock(&ata_mutex, TIMEOUT_BLOCK);
435 
        if (TIME_AFTER(USEC_TIMER, ata_last_activity_value + ata_sleep_timeout) && ata_powered)
436 
            ata_power_down();
437 
        mutex_unlock(&ata_mutex);
438 
        sleep(1000000);
439 
    }
440 
}
441 
 
442 
/* API Functions */
443 
int ata_soft_reset()
444 
{
445 
    mutex_lock(&ata_mutex, TIMEOUT_BLOCK);
446 
    if (!ata_powered) ata_power_up();
447 
    ata_set_active();
448 
    ata_write_cbr(&ATA_PIO_DAD, BIT(1) | BIT(2));
449 
    sleep(10);
450 
    ata_write_cbr(&ATA_PIO_DAD, 0);
337 theseven 451 
    PASS_RC_MTX(ata_wait_for_rdy(60000000), 0, 0, &ata_mutex);
301 theseven 452 
    ata_set_active();
453 
    mutex_unlock(&ata_mutex);
454 
}
455 
 
456 
int ata_read_sectors(IF_MD2(int drive,) unsigned long start, int incount,
457 
                     void* inbuf)
458 
{
459 
    mutex_lock(&ata_mutex, TIMEOUT_BLOCK);
337 theseven 460 
    int rc = ata_rw_sectors(start, incount, inbuf, false);
301 theseven 461 
    mutex_unlock(&ata_mutex);
462 
    return rc;
463 
}
464 
 
465 
int ata_write_sectors(IF_MD2(int drive,) unsigned long start, int count,
466 
                      const void* outbuf)
467 
{
468 
    mutex_lock(&ata_mutex, TIMEOUT_BLOCK);
337 theseven 469 
    int rc = ata_rw_sectors(start, count, (void*)((uint32_t)outbuf), true);
301 theseven 470 
    mutex_unlock(&ata_mutex);
471 
    return rc;
472 
}
473 
 
337 theseven 474 
void ata_spindown(int seconds)
475 
{
476 
    ata_sleep_timeout = seconds * 1000000;
477 
}
301 theseven 478 
 
479 
void ata_sleep(void)
480 
{
481 
    mutex_lock(&ata_mutex, TIMEOUT_BLOCK);
482 
    ata_power_down();
483 
    mutex_unlock(&ata_mutex);
484 
}
485 
 
486 
void ata_sleepnow(void)
487 
{
488 
    ata_sleep();
489 
}
490 
 
491 
void ata_close(void)
492 
{
493 
    ata_sleep();
494 
}
495 
 
496 
void ata_spin(void)
497 
{
498 
    ata_power_up();
499 
}
500 
 
501 
void ata_get_info(IF_MD2(int drive,) struct storage_info *info)
502 
{
503 
    (*info).sector_size = SECTOR_SIZE;
328 theseven 504 
#ifdef ATA_HAVE_BBT
505 
    (*info).num_sectors = ata_virtual_sectors;
506 
#else
301 theseven 507 
    (*info).num_sectors = ata_total_sectors;
328 theseven 508 
#endif
301 theseven 509 
    (*info).vendor = "Apple";
510 
    (*info).product = "iPod Classic";
511 
    (*info).revision = "1.0";
512 
}
513 
 
514 
long ata_last_disk_activity(void)
515 
{
516 
    return ata_last_activity_value;
517 
}
518 
 
519 
int ata_init(void)
520 
{
521 
    mutex_init(&ata_mutex);
522 
    wakeup_init(&ata_wakeup);
523 
    PCON(7) = 0x44444444;
524 
    PCON(8) = 0x44444444;
525 
    PCON(9) = 0x44444444;
526 
    PCON(10) = (PCON(10) & ~0xffff) | 0x4444;
527 
    ata_powered = false;
528 
    ata_total_sectors = 0;
328 theseven 529 
#ifdef ATA_HAVE_BBT
530 
    mutex_lock(&ata_mutex, TIMEOUT_BLOCK);
531 
    memset(ata_bbt, 0, sizeof(ata_bbt));
532 
    ata_power_up();
533 
    uint32_t* buf = (uint32_t*)(ata_bbt[ARRAYLEN(ata_bbt) - 64]);
534 
    ata_bbt_read_sectors(0, 1, buf);
535 
    if (!memcmp(buf, "emBIbbth", 8))
536 
    {
339 theseven 537 
        ata_virtual_sectors = (((uint64_t)buf[0x1fd]) << 32) | buf[0x1fc];
328 theseven 538 
        uint32_t count = buf[0x1ff];
539 
        if (count > (ATA_BBT_PAGES >> 6))
337 theseven 540 
            panicf(PANIC_KILLTHREAD, "ATA: BBT too big! (%d pages, limit: %d)\n", count << 6, ATA_BBT_PAGES);
328 theseven 541 
        uint32_t i;
542 
        uint32_t cnt;
543 
        for (i = 0; i < count; i += cnt)
544 
        {
545 
            uint32_t phys = buf[0x200 + i];
546 
            for (cnt = 1; cnt < count; cnt++)
547 
                if (buf[0x200 + i + cnt] != phys + cnt)
548 
                    break;
549 
            ata_bbt_read_sectors(phys, cnt, ata_bbt[i << 6]);
550 
        }
551 
    }
552 
    else ata_virtual_sectors = ata_total_sectors;
553 
    mutex_unlock(&ata_mutex);
554 
#endif
301 theseven 555 
    thread_create("ATA idle monitor", ata_thread, ata_stack,
556 
                  sizeof(ata_stack), USER_THREAD, 1, true);
557 
    return 0;
558 
}
559 
 
560 
#ifdef CONFIG_STORAGE_MULTI
561 
int ata_num_drives(int first_drive)
562 
{
563 
    /* We don't care which logical drive number(s) we have been assigned */
564 
    (void)first_drive;
565 
 
566 
    return 1;
567 
}
568 
#endif
569 
 
570 
void INT_ATA()
571 
{
572 
    uint32_t ata_irq = ATA_IRQ;
573 
    ATA_IRQ = ata_irq;
574 
    if (ata_irq & ATA_IRQ_MASK) wakeup_signal(&ata_wakeup);
575 
    ATA_IRQ_MASK = 0;
576 
}