Changeset 882bc4b in mainline

Timestamp:

2013-07-05T08:19:00Z (12 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

ca4730a5

Parents:

d8b47eca

Message:

Factor out ATA PIO data in/out protocols, per standard.

File:

• uspace/drv/block/ata_bd/ata_bd.c (modified) (13 diffs)

uspace/drv/block/ata_bd/ata_bd.c

@@ -100 +100 @@
     const void *buf);
 static int disk_init(ata_ctrl_t *ctrl, disk_t *d, int disk_id);
-static int drive_identify(disk_t *disk, void *buf);
-static int identify_pkt_dev(disk_t *disk, void *buf);
+static int ata_identify_dev(disk_t *disk, void *buf);
+static int ata_identify_pkt_dev(disk_t *disk, void *buf);
 static int ata_cmd_packet(disk_t *disk, const void *cpkt, size_t cpkt_size,
     void *obuf, size_t obuf_size);
@@ -353 +353 @@
 
         /* Try identify command. */
-        rc = drive_identify(d, &idata);
+        rc = ata_identify_dev(d, &idata);
         if (rc == EOK) {
                 /* Success. It's a register (non-packet) device. */
@@ -373 +373 @@
 
                 if (bc == PDEV_SIGNATURE_BC) {
-                        rc = identify_pkt_dev(d, &idata);
+                        rc = ata_identify_pkt_dev(d, &idata);
                         if (rc == EOK) {
                                 /* We have a packet device. */
@@ -570 +570 @@
 }
 
-/** Issue IDENTIFY command.
+/** PIO data-in command protocol. */
+static int ata_pio_data_in(disk_t *disk, void *obuf, size_t obuf_size,
+    size_t blk_size, size_t nblocks)
+{
+        ata_ctrl_t *ctrl = disk->ctrl;
+        uint16_t data;
+        size_t i;
+        uint8_t status;
+
+        /* XXX Support multiple blocks */
+        assert(nblocks == 1);
+        assert(blk_size % 2 == 0);
+
+        if (wait_status(ctrl, 0, ~SR_BSY, &status, TIMEOUT_BSY) != EOK)
+                return EIO;
+
+        if ((status & SR_DRQ) != 0) {
+                /* Read data from the device buffer. */
+
+                for (i = 0; i < blk_size / 2; i++) {
+                        data = pio_read_16(&ctrl->cmd->data_port);
+                        ((uint16_t *) obuf)[i] = data;
+                }
+        }
+
+        if ((status & SR_ERR) != 0)
+                return EIO;
+
+        return EOK;
+}
+
+/** PIO data-out command protocol. */
+static int ata_pio_data_out(disk_t *disk, const void *buf, size_t buf_size,
+    size_t blk_size, size_t nblocks)
+{
+        ata_ctrl_t *ctrl = disk->ctrl;
+        size_t i;
+        uint8_t status;
+
+        /* XXX Support multiple blocks */
+        assert(nblocks == 1);
+        assert(blk_size % 2 == 0);
+
+        if (wait_status(ctrl, 0, ~SR_BSY, &status, TIMEOUT_BSY) != EOK)
+                return EIO;
+
+        if ((status & SR_DRQ) != 0) {
+                /* Write data to the device buffer. */
+
+                for (i = 0; i < blk_size / 2; i++) {
+                        pio_write_16(&ctrl->cmd->data_port, ((uint16_t *) buf)[i]);
+                }
+        }
+
+        if (status & SR_ERR)
+                return EIO;
+
+        return EOK;
+}
+
+/** Issue IDENTIFY DEVICE command.
  *
  * Reads @c identify data into the provided buffer. This is used to detect
@@ -581 +641 @@
  *                      not present). EIO if device responds with error.
  */
-static int drive_identify(disk_t *disk, void *buf)
+static int ata_identify_dev(disk_t *disk, void *buf)
 {
         ata_ctrl_t *ctrl = disk->ctrl;
-        uint16_t data;
         uint8_t status;
         uint8_t drv_head;
-        size_t i;
 
         drv_head = ((disk_dev_idx(disk) != 0) ? DHR_DRV : 0);
@@ -613 +671 @@
          * the caller to check for one.
          */
-        if ((status & SR_ERR) != 0) {
-                return EIO;
-        }
-
+        if ((status & SR_ERR) != 0)
+                return EIO;
+
+        /*
+         * For probing purposes we need to wait for some status bit to become
+         * active - otherwise we could be fooled just by receiving all zeroes.
+         */
         if (wait_status(ctrl, SR_DRQ, ~SR_BSY, &status, TIMEOUT_PROBE) != EOK)
                 return ETIMEOUT;
 
-        /* Read data from the disk buffer. */
-
-        for (i = 0; i < identify_data_size / 2; i++) {
-                data = pio_read_16(&ctrl->cmd->data_port);
-                ((uint16_t *) buf)[i] = data;
-        }
-
-        return EOK;
+        return ata_pio_data_in(disk, buf, identify_data_size,
+            identify_data_size, 1);
 }
 
@@ -638 +693 @@
  * @param buf           Pointer to a 512-byte buffer.
  */
-static int identify_pkt_dev(disk_t *disk, void *buf)
+static int ata_identify_pkt_dev(disk_t *disk, void *buf)
 {
         ata_ctrl_t *ctrl = disk->ctrl;
-        uint16_t data;
-        uint8_t status;
         uint8_t drv_head;
-        size_t i;
 
         drv_head = ((disk_dev_idx(disk) != 0) ? DHR_DRV : 0);
@@ -659 +711 @@
         pio_write_8(&ctrl->cmd->command, CMD_IDENTIFY_PKT_DEV);
 
-        if (wait_status(ctrl, 0, ~SR_BSY, &status, TIMEOUT_BSY) != EOK)
-                return EIO;
-
-        /* Read data from the device buffer. */
-
-        if ((status & SR_DRQ) != 0) {
-                for (i = 0; i < identify_data_size / 2; i++) {
-                        data = pio_read_16(&ctrl->cmd->data_port);
-                        ((uint16_t *) buf)[i] = data;
-                }
-        }
-
-        if ((status & SR_ERR) != 0)
-                return EIO;
-
-        return EOK;
+        return ata_pio_data_in(disk, buf, identify_data_size,
+            identify_data_size, 1);
 }
 
@@ -864 +902 @@
 }
 
-/** Read a physical from the device.
+/** Read a physical block from the device.
  *
  * @param disk          Disk
@@ -877 +915 @@
 {
         ata_ctrl_t *ctrl = disk->ctrl;
-        size_t i;
-        uint16_t data;
-        uint8_t status;
         uint8_t drv_head;
         block_coord_t bc;
+        int rc;
 
         /* Silence warning. */
@@ -918 +954 @@
             CMD_READ_SECTORS_EXT : CMD_READ_SECTORS);
 
-        if (wait_status(ctrl, 0, ~SR_BSY, &status, TIMEOUT_BSY) != EOK) {
-                fibril_mutex_unlock(&ctrl->lock);
-                return EIO;
-        }
-
-        if ((status & SR_DRQ) != 0) {
-                /* Read data from the device buffer. */
-
-                for (i = 0; i < disk->block_size / 2; i++) {
-                        data = pio_read_16(&ctrl->cmd->data_port);
-                        ((uint16_t *) buf)[i] = data;
-                }
-        }
+        rc = ata_pio_data_in(disk, buf, blk_cnt * disk->block_size,
+            disk->block_size, blk_cnt);
 
         fibril_mutex_unlock(&ctrl->lock);
 
-        if ((status & SR_ERR) != 0)
-                return EIO;
-
-        return EOK;
+        return rc;
 }
 
@@ -953 +975 @@
 {
         ata_ctrl_t *ctrl = disk->ctrl;
-        size_t i;
-        uint8_t status;
         uint8_t drv_head;
         block_coord_t bc;
+        int rc;
 
         /* Silence warning. */
@@ -993 +1014 @@
             CMD_WRITE_SECTORS_EXT : CMD_WRITE_SECTORS);
 
-        if (wait_status(ctrl, 0, ~SR_BSY, &status, TIMEOUT_BSY) != EOK) {
-                fibril_mutex_unlock(&ctrl->lock);
-                return EIO;
-        }
-
-        if ((status & SR_DRQ) != 0) {
-                /* Write data to the device buffer. */
-
-                for (i = 0; i < disk->block_size / 2; i++) {
-                        pio_write_16(&ctrl->cmd->data_port, ((uint16_t *) buf)[i]);
-                }
-        }
+        rc = ata_pio_data_out(disk, buf, cnt * disk->block_size,
+            disk->block_size, cnt);
 
         fibril_mutex_unlock(&ctrl->lock);
-
-        if (status & SR_ERR)
-                return EIO;
-
-        return EOK;
+        return rc;
 }