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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.  
  58. #include "ata_bd.h"
  59.  
  60. #define NAME "ata_bd"
  61.  
  62. static const size_t block_size = 512;
  63. static size_t comm_size;
  64.  
  65. static uintptr_t cmd_physical = 0x1f0;
  66. static uintptr_t ctl_physical = 0x170;
  67. static ata_cmd_t *cmd;
  68. static ata_ctl_t *ctl;
  69.  
  70. /** Per-disk state. */
  71. static disk_t disk[MAX_DISKS];
  72.  
  73. static int ata_bd_init(void);
  74. static void ata_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
  75. static int ata_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,
  76.     void *buf);
  77. static int ata_bd_read_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  78.     void *buf);
  79. static int ata_bd_write_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  80.     const void *buf);
  81. static int drive_identify(int drive_id, disk_t *d);
  82.  
  83. int main(int argc, char **argv)
  84. {
  85.     uint8_t status;
  86.     char name[16];
  87.     int i, rc;
  88.     int n_disks;
  89.  
  90.     printf(NAME ": ATA disk driver\n");
  91.  
  92.     printf("I/O address 0x%x\n", cmd_physical);
  93.  
  94.     if (ata_bd_init() != EOK)
  95.         return -1;
  96.  
  97.     /* Put drives to reset, disable interrupts. */
  98.     printf("Reset drives...\n");
  99.     pio_write_8(&ctl->device_control, DCR_SRST);
  100.     /* FIXME: Find out how to do this properly. */
  101.     async_usleep(100);
  102.     pio_write_8(&ctl->device_control, 0);
  103.  
  104.     do {
  105.         status = pio_read_8(&cmd->status);
  106.     } while ((status & SR_BSY) != 0);
  107.     printf("Done\n");
  108.  
  109.     printf("Status = 0x%x\n", pio_read_8(&cmd->status));
  110.  
  111.     (void) drive_identify(0, &disk[0]);
  112.     (void) drive_identify(1, &disk[1]);
  113.  
  114.     n_disks = 0;
  115.  
  116.     for (i = 0; i < MAX_DISKS; i++) {
  117.         /* Skip unattached drives. */
  118.         if (disk[i].present == false)
  119.             continue;
  120.  
  121.         snprintf(name, 16, "disk%d", i);
  122.         rc = devmap_device_register(name, &disk[i].dev_handle);
  123.         if (rc != EOK) {
  124.             devmap_hangup_phone(DEVMAP_DRIVER);
  125.             printf(NAME ": Unable to register device %s.\n",
  126.                 name);
  127.             return rc;
  128.         }
  129.         ++n_disks;
  130.     }
  131.  
  132.     if (n_disks == 0) {
  133.         printf("No disks detected.\n");
  134.         return -1;
  135.     }
  136.  
  137.     printf(NAME ": Accepting connections\n");
  138.     async_manager();
  139.  
  140.     /* Not reached */
  141.     return 0;
  142. }
  143.  
  144. static int drive_identify(int disk_id, disk_t *d)
  145. {
  146.     uint16_t data;
  147.     uint8_t status;
  148.     size_t i;
  149.  
  150.     printf("Identify drive %d\n", disk_id);
  151.     pio_write_8(&cmd->drive_head, ((disk_id != 0) ? DHR_DRV : 0));
  152.     async_usleep(100);
  153.     pio_write_8(&cmd->command, CMD_IDENTIFY_DRIVE);
  154.  
  155.     status = pio_read_8(&cmd->status);
  156.     printf("Status = 0x%x\n", status);
  157.  
  158.     d->present = false;
  159.  
  160.     /*
  161.      * Detect if drive is present. This is Qemu only! Need to
  162.      * do the right thing to work with real drives.
  163.      */
  164.     if ((status & SR_DRDY) == 0) {
  165.         printf("None attached.\n");
  166.         return ENOENT;
  167.     }
  168.  
  169.     for (i = 0; i < block_size / 2; i++) {
  170.         do {
  171.             status = pio_read_8(&cmd->status);
  172.         } while ((status & SR_DRDY) == 0);
  173.  
  174.         data = pio_read_16(&cmd->data_port);
  175.  
  176.         switch (i) {
  177.         case 1: d->cylinders = data; break;
  178.         case 3: d->heads = data; break;
  179.         case 6: d->sectors = data; break;
  180.         }
  181.     }
  182.  
  183.     d->blocks = d->cylinders * d->heads * d->sectors;
  184.  
  185.     printf("Geometry: %u cylinders, %u heads, %u sectors\n",
  186.         d->cylinders, d->heads, d->sectors);
  187.  
  188.     d->present = true;
  189.     fibril_mutex_initialize(&d->lock);
  190.  
  191.     return EOK;
  192. }
  193.  
  194. static int ata_bd_init(void)
  195. {
  196.     void *vaddr;
  197.     int rc;
  198.  
  199.     rc = devmap_driver_register(NAME, ata_bd_connection);
  200.     if (rc < 0) {
  201.         printf(NAME ": Unable to register driver.\n");
  202.         return rc;
  203.     }
  204.  
  205.     rc = pio_enable((void *) cmd_physical, sizeof(ata_cmd_t), &vaddr);
  206.     if (rc != EOK) {
  207.         printf(NAME ": Could not initialize device I/O space.\n");
  208.         return rc;
  209.     }
  210.  
  211.     cmd = vaddr;
  212.  
  213.     rc = pio_enable((void *) ctl_physical, sizeof(ata_ctl_t), &vaddr);
  214.     if (rc != EOK) {
  215.         printf(NAME ": Could not initialize device I/O space.\n");
  216.         return rc;
  217.     }
  218.  
  219.     ctl = vaddr;
  220.  
  221.  
  222.     return EOK;
  223. }
  224.  
  225. static void ata_bd_connection(ipc_callid_t iid, ipc_call_t *icall)
  226. {
  227.     void *fs_va = NULL;
  228.     ipc_callid_t callid;
  229.     ipc_call_t call;
  230.     ipcarg_t method;
  231.     dev_handle_t dh;
  232.     int flags;
  233.     int retval;
  234.     off_t idx;
  235.     size_t size;
  236.     int disk_id, i;
  237.  
  238.     /* Get the device handle. */
  239.     dh = IPC_GET_ARG1(*icall);
  240.  
  241.     /* Determine which disk device is the client connecting to. */
  242.     disk_id = -1;
  243.     for (i = 0; i < MAX_DISKS; i++)
  244.         if (disk[i].dev_handle == dh)
  245.             disk_id = i;
  246.  
  247.     if (disk_id < 0 || disk[disk_id].present == false) {
  248.         ipc_answer_0(iid, EINVAL);
  249.         return;
  250.     }
  251.  
  252.     /* Answer the IPC_M_CONNECT_ME_TO call. */
  253.     ipc_answer_0(iid, EOK);
  254.  
  255.     if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
  256.         ipc_answer_0(callid, EHANGUP);
  257.         return;
  258.     }
  259.  
  260.     fs_va = as_get_mappable_page(comm_size);
  261.     if (fs_va == NULL) {
  262.         ipc_answer_0(callid, EHANGUP);
  263.         return;
  264.     }
  265.  
  266.     (void) ipc_share_out_finalize(callid, fs_va);
  267.  
  268.     while (1) {
  269.         callid = async_get_call(&call);
  270.         method = IPC_GET_METHOD(call);
  271.         switch (method) {
  272.         case IPC_M_PHONE_HUNGUP:
  273.             /* The other side has hung up. */
  274.             ipc_answer_0(callid, EOK);
  275.             return;
  276.         case BD_READ_BLOCK:
  277.         case BD_WRITE_BLOCK:
  278.             idx = IPC_GET_ARG1(call);
  279.             size = IPC_GET_ARG2(call);
  280.             if (size > comm_size) {
  281.                 retval = EINVAL;
  282.                 break;
  283.             }
  284.             retval = ata_bd_rdwr(disk_id, method, idx,
  285.                 size, fs_va);
  286.             break;
  287.         default:
  288.             retval = EINVAL;
  289.             break;
  290.         }
  291.         ipc_answer_0(callid, retval);
  292.     }
  293. }
  294.  
  295. static int ata_bd_rdwr(int disk_id, ipcarg_t method, off_t blk_idx, size_t size,
  296.     void *buf)
  297. {
  298.     int rc;
  299.     size_t now;
  300.  
  301.     while (size > 0) {
  302.         now = size < block_size ? size : block_size;
  303.         if (now != block_size)
  304.             return EINVAL;
  305.  
  306.         if (method == BD_READ_BLOCK)
  307.             rc = ata_bd_read_block(disk_id, blk_idx, 1, buf);
  308.         else
  309.             rc = ata_bd_write_block(disk_id, blk_idx, 1, buf);
  310.  
  311.         if (rc != EOK)
  312.             return rc;
  313.  
  314.         buf += block_size;
  315.         blk_idx++;
  316.  
  317.         if (size > block_size)
  318.             size -= block_size;
  319.         else
  320.             size = 0;
  321.     }
  322.  
  323.     return EOK;
  324. }
  325.  
  326.  
  327. static int ata_bd_read_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  328.     void *buf)
  329. {
  330.     size_t i;
  331.     uint16_t data;
  332.     uint8_t status;
  333.     uint64_t c, h, s;
  334.     uint64_t idx;
  335.     uint8_t drv_head;
  336.     disk_t *d;
  337.  
  338.     d = &disk[disk_id];
  339.  
  340.     /* Check device bounds. */
  341.     if (blk_idx >= d->blocks)
  342.         return EINVAL;
  343.  
  344.     /* Compute CHS. */
  345.     c = blk_idx / (d->heads * d->sectors);
  346.     idx = blk_idx % (d->heads * d->sectors);
  347.  
  348.     h = idx / d->sectors;
  349.     s = 1 + (idx % d->sectors);
  350.  
  351.     /* New value for Drive/Head register */
  352.     drv_head =
  353.         ((disk_id != 0) ? DHR_DRV : 0) |
  354.         (h & 0x0f);
  355.  
  356.     fibril_mutex_lock(&d->lock);
  357.  
  358.     /* Program a Read Sectors operation. */
  359.  
  360.     pio_write_8(&cmd->drive_head, drv_head);
  361.     pio_write_8(&cmd->sector_count, 1);
  362.     pio_write_8(&cmd->sector_number, s);
  363.     pio_write_8(&cmd->cylinder_low, c & 0xff);
  364.     pio_write_8(&cmd->cylinder_high, c >> 16);
  365.     pio_write_8(&cmd->command, CMD_READ_SECTORS);
  366.  
  367.     /* Read data from the disk buffer. */
  368.  
  369.     for (i = 0; i < block_size / 2; i++) {
  370.         do {
  371.             status = pio_read_8(&cmd->status);
  372.         } while ((status & SR_DRDY) == 0);
  373.  
  374.         data = pio_read_16(&cmd->data_port);
  375.         ((uint16_t *) buf)[i] = data;
  376.     }
  377.  
  378.     fibril_mutex_unlock(&d->lock);
  379.     return EOK;
  380. }
  381.  
  382. static int ata_bd_write_block(int disk_id, uint64_t blk_idx, size_t blk_cnt,
  383.     const void *buf)
  384. {
  385.     size_t i;
  386.     uint8_t status;
  387.     uint64_t c, h, s;
  388.     uint64_t idx;
  389.     uint8_t drv_head;
  390.     disk_t *d;
  391.  
  392.     d = &disk[disk_id];
  393.  
  394.     /* Check device bounds. */
  395.     if (blk_idx >= d->blocks)
  396.         return EINVAL;
  397.  
  398.     /* Compute CHS. */
  399.     c = blk_idx / (d->heads * d->sectors);
  400.     idx = blk_idx % (d->heads * d->sectors);
  401.  
  402.     h = idx / d->sectors;
  403.     s = 1 + (idx % d->sectors);
  404.  
  405.     /* New value for Drive/Head register */
  406.     drv_head =
  407.         ((disk_id != 0) ? DHR_DRV : 0) |
  408.         (h & 0x0f);
  409.  
  410.     fibril_mutex_lock(&d->lock);
  411.  
  412.     /* Program a Read Sectors operation. */
  413.  
  414.     pio_write_8(&cmd->drive_head, drv_head);
  415.     pio_write_8(&cmd->sector_count, 1);
  416.     pio_write_8(&cmd->sector_number, s);
  417.     pio_write_8(&cmd->cylinder_low, c & 0xff);
  418.     pio_write_8(&cmd->cylinder_high, c >> 16);
  419.     pio_write_8(&cmd->command, CMD_WRITE_SECTORS);
  420.  
  421.     /* Write data to the disk buffer. */
  422.  
  423.     for (i = 0; i < block_size / 2; i++) {
  424.         do {
  425.             status = pio_read_8(&cmd->status);
  426.         } while ((status & SR_DRDY) == 0);
  427.  
  428.         pio_write_16(&cmd->data_port, ((uint16_t *) buf)[i]);
  429.     }
  430.  
  431.     fibril_mutex_unlock(&d->lock);
  432.     return EOK;
  433. }
  434.  
  435.  
  436. /**
  437.  * @}
  438.  */
  439.