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  1. /*
  2.  * Copyright (c) 2009 Jiri Svoboda
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup bd
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief ATA disk driver
  36.  *
  37.  * This driver currently works only with CHS addressing and uses PIO.
  38.  * Currently based on the (now obsolete) ANSI X3.221-1994 (ATA-1) standard.
  39.  * At this point only reading is possible, not writing.
  40.  *
  41.  * The driver services a single controller which can have up to two disks
  42.  * attached.
  43.  */
  44.  
  45. #include <stdio.h>
  46. #include <libarch/ddi.h>
  47. #include <ddi.h>
  48. #include <ipc/ipc.h>
  49. #include <ipc/bd.h>
  50. #include <async.h>
  51. #include <as.h>
  52. #include <fibril_sync.h>
  53. #include <devmap.h>
  54. #include <sys/types.h>
  55. #include <errno.h>
  56. #include <bool.h>
  57. #include <task.h>
  58.  
  59. #include "ata_bd.h"
  60.  
  61. #define NAME "ata_bd"
  62.  
  63. static const size_t block_size = 512;
  64. static size_t comm_size;
  65.  
  66. static uintptr_t cmd_physical = 0x1f0;
  67. static uintptr_t ctl_physical = 0x170;
  68. static ata_cmd_t *cmd;
  69. static ata_ctl_t *ctl;
  70.  
  71. /** Per-disk state. */
  72. static disk_t disk[MAX_DISKS];
  73.  
  74. static int ata_bd_init(void);
  75. static void ata_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
  76. static int ata_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,
  77.     void *buf);
  78. static int ata_bd_read_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  79.     void *buf);
  80. static int ata_bd_write_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  81.     const void *buf);
  82. static int drive_identify(int drive_id, disk_t *d);
  83.  
  84. int main(int argc, char **argv)
  85. {
  86.     uint8_t status;
  87.     char name[16];
  88.     int i, rc;
  89.     int n_disks;
  90.  
  91.     printf(NAME ": ATA disk driver\n");
  92.  
  93.     printf("I/O address 0x%x\n", cmd_physical);
  94.  
  95.     if (ata_bd_init() != EOK)
  96.         return -1;
  97.  
  98.     /* Put drives to reset, disable interrupts. */
  99.     printf("Reset drives... ");
  100.     fflush(stdout);
  101.  
  102.     pio_write_8(&ctl->device_control, DCR_SRST);
  103.     /* FIXME: Find out how to do this properly. */
  104.     async_usleep(100);
  105.     pio_write_8(&ctl->device_control, 0);
  106.  
  107.     do {
  108.         status = pio_read_8(&cmd->status);
  109.     } while ((status & SR_BSY) != 0);
  110.     printf("Done\n");
  111.  
  112.     (void) drive_identify(0, &disk[0]);
  113.     (void) drive_identify(1, &disk[1]);
  114.  
  115.     n_disks = 0;
  116.  
  117.     for (i = 0; i < MAX_DISKS; i++) {
  118.         /* Skip unattached drives. */
  119.         if (disk[i].present == false)
  120.             continue;
  121.  
  122.         snprintf(name, 16, "disk%d", i);
  123.         rc = devmap_device_register(name, &disk[i].dev_handle);
  124.         if (rc != EOK) {
  125.             devmap_hangup_phone(DEVMAP_DRIVER);
  126.             printf(NAME ": Unable to register device %s.\n",
  127.                 name);
  128.             return rc;
  129.         }
  130.         ++n_disks;
  131.     }
  132.  
  133.     if (n_disks == 0) {
  134.         printf("No disks detected.\n");
  135.         return -1;
  136.     }
  137.  
  138.     printf(NAME ": Accepting connections\n");
  139.     task_retval(0);
  140.     async_manager();
  141.  
  142.     /* Not reached */
  143.     return 0;
  144. }
  145.  
  146. static int drive_identify(int disk_id, disk_t *d)
  147. {
  148.     uint16_t data;
  149.     uint8_t status;
  150.     size_t i;
  151.  
  152.     printf("Identify drive %d... ", disk_id);
  153.     fflush(stdout);
  154.  
  155.     pio_write_8(&cmd->drive_head, ((disk_id != 0) ? DHR_DRV : 0));
  156.     async_usleep(100);
  157.     pio_write_8(&cmd->command, CMD_IDENTIFY_DRIVE);
  158.  
  159.     status = pio_read_8(&cmd->status);
  160.  
  161.     d->present = false;
  162.  
  163.     /*
  164.      * Detect if drive is present. This is Qemu only! Need to
  165.      * do the right thing to work with real drives.
  166.      */
  167.     if ((status & SR_DRDY) == 0) {
  168.         printf("None attached.\n");
  169.         return ENOENT;
  170.     }
  171.  
  172.     for (i = 0; i < block_size / 2; i++) {
  173.         do {
  174.             status = pio_read_8(&cmd->status);
  175.         } while ((status & SR_DRDY) == 0);
  176.  
  177.         data = pio_read_16(&cmd->data_port);
  178.  
  179.         switch (i) {
  180.         case 1: d->cylinders = data; break;
  181.         case 3: d->heads = data; break;
  182.         case 6: d->sectors = data; break;
  183.         }
  184.     }
  185.  
  186.     d->blocks = d->cylinders * d->heads * d->sectors;
  187.  
  188.     printf("Geometry: %u cylinders, %u heads, %u sectors\n",
  189.         d->cylinders, d->heads, d->sectors);
  190.  
  191.     d->present = true;
  192.     fibril_mutex_initialize(&d->lock);
  193.  
  194.     return EOK;
  195. }
  196.  
  197. static int ata_bd_init(void)
  198. {
  199.     void *vaddr;
  200.     int rc;
  201.  
  202.     rc = devmap_driver_register(NAME, ata_bd_connection);
  203.     if (rc < 0) {
  204.         printf(NAME ": Unable to register driver.\n");
  205.         return rc;
  206.     }
  207.  
  208.     rc = pio_enable((void *) cmd_physical, sizeof(ata_cmd_t), &vaddr);
  209.     if (rc != EOK) {
  210.         printf(NAME ": Could not initialize device I/O space.\n");
  211.         return rc;
  212.     }
  213.  
  214.     cmd = vaddr;
  215.  
  216.     rc = pio_enable((void *) ctl_physical, sizeof(ata_ctl_t), &vaddr);
  217.     if (rc != EOK) {
  218.         printf(NAME ": Could not initialize device I/O space.\n");
  219.         return rc;
  220.     }
  221.  
  222.     ctl = vaddr;
  223.  
  224.  
  225.     return EOK;
  226. }
  227.  
  228. static void ata_bd_connection(ipc_callid_t iid, ipc_call_t *icall)
  229. {
  230.     void *fs_va = NULL;
  231.     ipc_callid_t callid;
  232.     ipc_call_t call;
  233.     ipcarg_t method;
  234.     dev_handle_t dh;
  235.     int flags;
  236.     int retval;
  237.     off_t idx;
  238.     size_t size;
  239.     int disk_id, i;
  240.  
  241.     /* Get the device handle. */
  242.     dh = IPC_GET_ARG1(*icall);
  243.  
  244.     /* Determine which disk device is the client connecting to. */
  245.     disk_id = -1;
  246.     for (i = 0; i < MAX_DISKS; i++)
  247.         if (disk[i].dev_handle == dh)
  248.             disk_id = i;
  249.  
  250.     if (disk_id < 0 || disk[disk_id].present == false) {
  251.         ipc_answer_0(iid, EINVAL);
  252.         return;
  253.     }
  254.  
  255.     /* Answer the IPC_M_CONNECT_ME_TO call. */
  256.     ipc_answer_0(iid, EOK);
  257.  
  258.     if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
  259.         ipc_answer_0(callid, EHANGUP);
  260.         return;
  261.     }
  262.  
  263.     fs_va = as_get_mappable_page(comm_size);
  264.     if (fs_va == NULL) {
  265.         ipc_answer_0(callid, EHANGUP);
  266.         return;
  267.     }
  268.  
  269.     (void) ipc_share_out_finalize(callid, fs_va);
  270.  
  271.     while (1) {
  272.         callid = async_get_call(&call);
  273.         method = IPC_GET_METHOD(call);
  274.         switch (method) {
  275.         case IPC_M_PHONE_HUNGUP:
  276.             /* The other side has hung up. */
  277.             ipc_answer_0(callid, EOK);
  278.             return;
  279.         case BD_READ_BLOCK:
  280.         case BD_WRITE_BLOCK:
  281.             idx = IPC_GET_ARG1(call);
  282.             size = IPC_GET_ARG2(call);
  283.             if (size > comm_size) {
  284.                 retval = EINVAL;
  285.                 break;
  286.             }
  287.             retval = ata_bd_rdwr(disk_id, method, idx,
  288.                 size, fs_va);
  289.             break;
  290.         default:
  291.             retval = EINVAL;
  292.             break;
  293.         }
  294.         ipc_answer_0(callid, retval);
  295.     }
  296. }
  297.  
  298. static int ata_bd_rdwr(int disk_id, ipcarg_t method, off_t blk_idx, size_t size,
  299.     void *buf)
  300. {
  301.     int rc;
  302.     size_t now;
  303.  
  304.     while (size > 0) {
  305.         now = size < block_size ? size : block_size;
  306.         if (now != block_size)
  307.             return EINVAL;
  308.  
  309.         if (method == BD_READ_BLOCK)
  310.             rc = ata_bd_read_block(disk_id, blk_idx, 1, buf);
  311.         else
  312.             rc = ata_bd_write_block(disk_id, blk_idx, 1, buf);
  313.  
  314.         if (rc != EOK)
  315.             return rc;
  316.  
  317.         buf += block_size;
  318.         blk_idx++;
  319.  
  320.         if (size > block_size)
  321.             size -= block_size;
  322.         else
  323.             size = 0;
  324.     }
  325.  
  326.     return EOK;
  327. }
  328.  
  329.  
  330. static int ata_bd_read_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  331.     void *buf)
  332. {
  333.     size_t i;
  334.     uint16_t data;
  335.     uint8_t status;
  336.     uint64_t c, h, s;
  337.     uint64_t idx;
  338.     uint8_t drv_head;
  339.     disk_t *d;
  340.  
  341.     d = &disk[disk_id];
  342.  
  343.     /* Check device bounds. */
  344.     if (blk_idx >= d->blocks)
  345.         return EINVAL;
  346.  
  347.     /* Compute CHS. */
  348.     c = blk_idx / (d->heads * d->sectors);
  349.     idx = blk_idx % (d->heads * d->sectors);
  350.  
  351.     h = idx / d->sectors;
  352.     s = 1 + (idx % d->sectors);
  353.  
  354.     /* New value for Drive/Head register */
  355.     drv_head =
  356.         ((disk_id != 0) ? DHR_DRV : 0) |
  357.         (h & 0x0f);
  358.  
  359.     fibril_mutex_lock(&d->lock);
  360.  
  361.     /* Program a Read Sectors operation. */
  362.  
  363.     pio_write_8(&cmd->drive_head, drv_head);
  364.     pio_write_8(&cmd->sector_count, 1);
  365.     pio_write_8(&cmd->sector_number, s);
  366.     pio_write_8(&cmd->cylinder_low, c & 0xff);
  367.     pio_write_8(&cmd->cylinder_high, c >> 16);
  368.     pio_write_8(&cmd->command, CMD_READ_SECTORS);
  369.  
  370.     /* Read data from the disk buffer. */
  371.  
  372.     for (i = 0; i < block_size / 2; i++) {
  373.         do {
  374.             status = pio_read_8(&cmd->status);
  375.         } while ((status & SR_DRDY) == 0);
  376.  
  377.         data = pio_read_16(&cmd->data_port);
  378.         ((uint16_t *) buf)[i] = data;
  379.     }
  380.  
  381.     fibril_mutex_unlock(&d->lock);
  382.     return EOK;
  383. }
  384.  
  385. static int ata_bd_write_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  386.     const void *buf)
  387. {
  388.     size_t i;
  389.     uint8_t status;
  390.     uint64_t c, h, s;
  391.     uint64_t idx;
  392.     uint8_t drv_head;
  393.     disk_t *d;
  394.  
  395.     d = &disk[disk_id];
  396.  
  397.     /* Check device bounds. */
  398.     if (blk_idx >= d->blocks)
  399.         return EINVAL;
  400.  
  401.     /* Compute CHS. */
  402.     c = blk_idx / (d->heads * d->sectors);
  403.     idx = blk_idx % (d->heads * d->sectors);
  404.  
  405.     h = idx / d->sectors;
  406.     s = 1 + (idx % d->sectors);
  407.  
  408.     /* New value for Drive/Head register */
  409.     drv_head =
  410.         ((disk_id != 0) ? DHR_DRV : 0) |
  411.         (h & 0x0f);
  412.  
  413.     fibril_mutex_lock(&d->lock);
  414.  
  415.     /* Program a Read Sectors operation. */
  416.  
  417.     pio_write_8(&cmd->drive_head, drv_head);
  418.     pio_write_8(&cmd->sector_count, 1);
  419.     pio_write_8(&cmd->sector_number, s);
  420.     pio_write_8(&cmd->cylinder_low, c & 0xff);
  421.     pio_write_8(&cmd->cylinder_high, c >> 16);
  422.     pio_write_8(&cmd->command, CMD_WRITE_SECTORS);
  423.  
  424.     /* Write data to the disk buffer. */
  425.  
  426.     for (i = 0; i < block_size / 2; i++) {
  427.         do {
  428.             status = pio_read_8(&cmd->status);
  429.         } while ((status & SR_DRDY) == 0);
  430.  
  431.         pio_write_16(&cmd->data_port, ((uint16_t *) buf)[i]);
  432.     }
  433.  
  434.     fibril_mutex_unlock(&d->lock);
  435.     return EOK;
  436. }
  437.  
  438.  
  439. /**
  440.  * @}
  441.  */
  442.