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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 GXemul disk driver
  36.  */
  37.  
  38. #include <stdio.h>
  39. #include <libarch/ddi.h>
  40. #include <ddi.h>
  41. #include <ipc/ipc.h>
  42. #include <ipc/bd.h>
  43. #include <async.h>
  44. #include <as.h>
  45. #include <fibril_sync.h>
  46. #include <devmap.h>
  47. #include <sys/types.h>
  48. #include <errno.h>
  49. #include <task.h>
  50.  
  51. #define NAME "gxe_bd"
  52.  
  53. enum {
  54.     CTL_READ_START  = 0,
  55.     CTL_WRITE_START = 1,
  56. };
  57.  
  58. enum {
  59.     STATUS_FAILURE  = 0
  60. };
  61.  
  62. enum {
  63.     MAX_DISKS   = 2
  64. };
  65.  
  66. typedef struct {
  67.     uint32_t offset_lo;
  68.     uint32_t pad0;
  69.     uint32_t offset_hi;
  70.     uint32_t pad1;
  71.  
  72.     uint32_t disk_id;
  73.     uint32_t pad2[3];
  74.  
  75.     uint32_t control;
  76.     uint32_t pad3[3];
  77.  
  78.     uint32_t status;
  79.  
  80.     uint32_t pad4[3];
  81.     uint8_t pad5[0x3fc0];
  82.  
  83.     uint8_t buffer[512];
  84. } gxe_bd_t;
  85.  
  86.  
  87. static const size_t block_size = 512;
  88. static size_t comm_size;
  89.  
  90. static uintptr_t dev_physical = 0x13000000;
  91. static gxe_bd_t *dev;
  92.  
  93. static dev_handle_t dev_handle[MAX_DISKS];
  94.  
  95. static fibril_mutex_t dev_lock[MAX_DISKS];
  96.  
  97. static int gxe_bd_init(void);
  98. static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
  99. static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,
  100.     void *buf);
  101. static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
  102.     void *buf);
  103. static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
  104.     const void *buf);
  105.  
  106. int main(int argc, char **argv)
  107. {
  108.     printf(NAME ": GXemul disk driver\n");
  109.  
  110.     if (gxe_bd_init() != EOK)
  111.         return -1;
  112.  
  113.     printf(NAME ": Accepting connections\n");
  114.     task_retval(0);
  115.     async_manager();
  116.  
  117.     /* Not reached */
  118.     return 0;
  119. }
  120.  
  121. static int gxe_bd_init(void)
  122. {
  123.     void *vaddr;
  124.     int rc, i;
  125.     char name[16];
  126.  
  127.     rc = devmap_driver_register(NAME, gxe_bd_connection);
  128.     if (rc < 0) {
  129.         printf(NAME ": Unable to register driver.\n");
  130.         return rc;
  131.     }
  132.  
  133.     rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_t), &vaddr);
  134.     if (rc != EOK) {
  135.         printf(NAME ": Could not initialize device I/O space.\n");
  136.         return rc;
  137.     }
  138.  
  139.     dev = vaddr;
  140.  
  141.     for (i = 0; i < MAX_DISKS; i++) {
  142.         snprintf(name, 16, "disk%d", i);
  143.         rc = devmap_device_register(name, &dev_handle[i]);
  144.         if (rc != EOK) {
  145.             devmap_hangup_phone(DEVMAP_DRIVER);
  146.             printf(NAME ": Unable to register device %s.\n",
  147.                 name);
  148.             return rc;
  149.         }
  150.         fibril_mutex_initialize(&dev_lock[i]);
  151.     }
  152.  
  153.     return EOK;
  154. }
  155.  
  156. static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall)
  157. {
  158.     void *fs_va = NULL;
  159.     ipc_callid_t callid;
  160.     ipc_call_t call;
  161.     ipcarg_t method;
  162.     dev_handle_t dh;
  163.     int flags;
  164.     int retval;
  165.     off_t idx;
  166.     size_t size;
  167.     int disk_id, i;
  168.  
  169.     /* Get the device handle. */
  170.     dh = IPC_GET_ARG1(*icall);
  171.  
  172.     /* Determine which disk device is the client connecting to. */
  173.     disk_id = -1;
  174.     for (i = 0; i < MAX_DISKS; i++)
  175.         if (dev_handle[i] == dh)
  176.             disk_id = i;
  177.  
  178.     if (disk_id < 0) {
  179.         ipc_answer_0(iid, EINVAL);
  180.         return;
  181.     }
  182.  
  183.     /* Answer the IPC_M_CONNECT_ME_TO call. */
  184.     ipc_answer_0(iid, EOK);
  185.  
  186.     if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
  187.         ipc_answer_0(callid, EHANGUP);
  188.         return;
  189.     }
  190.  
  191.     fs_va = as_get_mappable_page(comm_size);
  192.     if (fs_va == NULL) {
  193.         ipc_answer_0(callid, EHANGUP);
  194.         return;
  195.     }
  196.  
  197.     (void) ipc_share_out_finalize(callid, fs_va);
  198.  
  199.     while (1) {
  200.         callid = async_get_call(&call);
  201.         method = IPC_GET_METHOD(call);
  202.         switch (method) {
  203.         case IPC_M_PHONE_HUNGUP:
  204.             /* The other side has hung up. */
  205.             ipc_answer_0(callid, EOK);
  206.             return;
  207.         case BD_READ_BLOCK:
  208.         case BD_WRITE_BLOCK:
  209.             idx = IPC_GET_ARG1(call);
  210.             size = IPC_GET_ARG2(call);
  211.             if (size > comm_size) {
  212.                 retval = EINVAL;
  213.                 break;
  214.             }
  215.             retval = gx_bd_rdwr(disk_id, method, idx * size,
  216.                 size, fs_va);
  217.             break;
  218.         default:
  219.             retval = EINVAL;
  220.             break;
  221.         }
  222.         ipc_answer_0(callid, retval);
  223.     }
  224. }
  225.  
  226. static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,
  227.     void *buf)
  228. {
  229.     int rc;
  230.     size_t now;
  231.  
  232.     while (size > 0) {
  233.         now = size < block_size ? size : block_size;
  234.  
  235.         if (method == BD_READ_BLOCK)
  236.             rc = gxe_bd_read_block(disk_id, offset, now, buf);
  237.         else
  238.             rc = gxe_bd_write_block(disk_id, offset, now, buf);
  239.  
  240.         if (rc != EOK)
  241.             return rc;
  242.  
  243.         buf += block_size;
  244.         offset += block_size;
  245.  
  246.         if (size > block_size)
  247.             size -= block_size;
  248.         else
  249.             size = 0;
  250.     }
  251.  
  252.     return EOK;
  253. }
  254.  
  255. static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
  256.     void *buf)
  257. {
  258.     uint32_t status;
  259.     size_t i;
  260.     uint32_t w;
  261.  
  262.     fibril_mutex_lock(&dev_lock[disk_id]);
  263.     pio_write_32(&dev->offset_lo, (uint32_t) offset);
  264.     pio_write_32(&dev->offset_hi, offset >> 32);
  265.     pio_write_32(&dev->disk_id, disk_id);
  266.     pio_write_32(&dev->control, CTL_READ_START);
  267.  
  268.     status = pio_read_32(&dev->status);
  269.     if (status == STATUS_FAILURE) {
  270.         fibril_mutex_unlock(&dev_lock[disk_id]);
  271.         return EIO;
  272.     }
  273.  
  274.     for (i = 0; i < size; i++) {
  275.         ((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);
  276.     }
  277.  
  278.     fibril_mutex_unlock(&dev_lock[disk_id]);
  279.     return EOK;
  280. }
  281.  
  282. static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
  283.     const void *buf)
  284. {
  285.     uint32_t status;
  286.     size_t i;
  287.  
  288.     for (i = 0; i < size; i++) {
  289.         pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);
  290.     }
  291.  
  292.     fibril_mutex_lock(&dev_lock[disk_id]);
  293.     pio_write_32(&dev->offset_lo, (uint32_t) offset);
  294.     pio_write_32(&dev->offset_hi, offset >> 32);
  295.     pio_write_32(&dev->disk_id, disk_id);
  296.     pio_write_32(&dev->control, CTL_WRITE_START);
  297.  
  298.     status = pio_read_32(&dev->status);
  299.     if (status == STATUS_FAILURE) {
  300.         fibril_mutex_unlock(&dev_lock[disk_id]);
  301.         return EIO;
  302.     }
  303.  
  304.     fibril_mutex_unlock(&dev_lock[disk_id]);
  305.     return EOK;
  306. }
  307.  
  308. /**
  309.  * @}
  310.  */
  311.