cmd640: remove cmd_drives[]

* Pass 'ide_drive_t *drive' to check_prefetch(), set_prefetch_mode(),
  program_drive_counts() and cmd640_set_mode().

* Remove no longer needed cmd_drives[].

* Inline setup_device_ptrs() helper in cmd640x_init().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 27 insertions, 40 deletions

diff --git a/drivers/ide/pci/cmd640.c b/drivers/ide/pci/cmd640.c
index a1cfe033a55f..3303ffb327a7 100644
--- a/drivers/ide/pci/cmd640.c
+++ b/drivers/ide/pci/cmd640.c
@@ -185,7 +185,6 @@ static DEFINE_SPINLOCK(cmd640_lock);
  * These are initialized to point at the devices we control
  */
 static ide_hwif_t  *cmd_hwif0, *cmd_hwif1;
-static ide_drive_t *cmd_drives[4];
 
 /*
  * Interface to access cmd640x registers
@@ -386,9 +385,8 @@ static void cmd640_dump_regs (void)
  * Check whether prefetch is on for a drive,
  * and initialize the unmask flags for safe operation.
  */
-static void __init check_prefetch (unsigned int index)
+static void __init check_prefetch(ide_drive_t *drive, unsigned int index)
 {
-        ide_drive_t *drive = cmd_drives[index];
         u8 b = get_cmd640_reg(prefetch_regs[index]);
 
         if (b & prefetch_masks[index]) {        /* is prefetch off? */
@@ -404,28 +402,13 @@ static void __init check_prefetch (unsigned int index)
         }
 }
 
-/*
- * Figure out which devices we control
- */
-static void __init setup_device_ptrs (void)
-{
-        cmd_hwif0 = &ide_hwifs[0];
-        cmd_hwif1 = &ide_hwifs[1];
-
-        cmd_drives[0] = &cmd_hwif0->drives[0];
-        cmd_drives[1] = &cmd_hwif0->drives[1];
-        cmd_drives[2] = &cmd_hwif1->drives[0];
-        cmd_drives[3] = &cmd_hwif1->drives[1];
-}
-
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
 
 /*
  * Sets prefetch mode for a drive.
  */
-static void set_prefetch_mode (unsigned int index, int mode)
+static void set_prefetch_mode(ide_drive_t *drive, unsigned int index, int mode)
 {
-        ide_drive_t *drive = cmd_drives[index];
         unsigned long flags;
         int reg = prefetch_regs[index];
         u8 b;
@@ -508,7 +491,7 @@ static void __init retrieve_drive_counts (unsigned int index)
  * This routine writes the prepared setup/active/recovery counts
  * for a drive into the cmd640 chipset registers to active them.
  */
-static void program_drive_counts (unsigned int index)
+static void program_drive_counts(ide_drive_t *drive, unsigned int index)
 {
         unsigned long flags;
         u8 setup_count    = setup_counts[index];
@@ -522,8 +505,11 @@ static void program_drive_counts (unsigned int index)
          * so we merge the timings, using the slowest value for each timing.
          */
         if (index > 1) {
-                unsigned int mate;
-                if (cmd_drives[mate = index ^ 1]->present) {
+                ide_hwif_t *hwif = drive->hwif;
+                ide_drive_t *peer = &hwif->drives[!drive->select.b.unit];
+                unsigned int mate = index ^ 1;
+
+                if (peer->present) {
                         if (setup_count < setup_counts[mate])
                                 setup_count = setup_counts[mate];
                         if (active_count < active_counts[mate])
@@ -562,7 +548,8 @@ static void program_drive_counts (unsigned int index)
 /*
  * Set a specific pio_mode for a drive
  */
-static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle_time)
+static void cmd640_set_mode(ide_drive_t *drive, unsigned int index,
+                            u8 pio_mode, unsigned int cycle_time)
 {
         int setup_time, active_time, recovery_time, clock_time;
         u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
@@ -611,7 +598,7 @@ static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle
          *      1) this is the wrong place to do it (proper is do_special() in ide.c)
          *      2) in practice this is rarely, if ever, necessary
          */
-        program_drive_counts (index);
+        program_drive_counts(drive, index);
 }
 
 static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
@@ -619,13 +606,6 @@ static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
         unsigned int index = 0, cycle_time;
         u8 b;
 
-        while (drive != cmd_drives[index]) {
-                if (++index > 3) {
-                        printk(KERN_ERR "%s: bad news in %s\n",
-                                        drive->name, __FUNCTION__);
-                        return;
-                }
-        }
         switch (pio) {
                 case 6: /* set fast-devsel off */
                 case 7: /* set fast-devsel on */
@@ -638,13 +618,13 @@ static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
 
                 case 8: /* set prefetch off */
                 case 9: /* set prefetch on */
-                        set_prefetch_mode(index, pio & 1);
+                        set_prefetch_mode(drive, index, pio & 1);
                         printk("%s: %sabled cmd640 prefetch\n", drive->name, (pio & 1) ? "en" : "dis");
                         return;
         }
 
         cycle_time = ide_pio_cycle_time(drive, pio);
-        cmd640_set_mode(index, pio, cycle_time);
+        cmd640_set_mode(drive, index, pio, cycle_time);
 
         printk("%s: selected cmd640 PIO mode%d (%dns)",
                 drive->name, pio, cycle_time);
@@ -764,11 +744,12 @@ static int __init cmd640x_init(void)
         printk(KERN_INFO "cmd640: buggy cmd640%c interface on %s, config=0x%02x"
                          "\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);
 
+        cmd_hwif0 = &ide_hwifs[0];
+        cmd_hwif1 = &ide_hwifs[1];
+
         /*
          * Initialize data for primary port
          */
-        setup_device_ptrs ();
-
         ide_init_port_hw(cmd_hwif0, &hw[0]);
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
         cmd_hwif0->set_pio_mode = &cmd640_set_pio_mode;
@@ -836,7 +817,13 @@ static int __init cmd640x_init(void)
          * Do not unnecessarily disturb any prior BIOS setup of these.
          */
         for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
-                ide_drive_t *drive = cmd_drives[index];
+                ide_drive_t *drive;
+
+                if (index > 1)
+                        drive = &cmd_hwif1->drives[index & 1];
+                else
+                        drive = &cmd_hwif0->drives[index & 1];
+
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
                 if (drive->autotune || ((index > 1) && second_port_toggled)) {
                         /*
@@ -846,8 +833,8 @@ static int __init cmd640x_init(void)
                         setup_counts    [index] = 4;    /* max possible */
                         active_counts   [index] = 16;   /* max possible */
                         recovery_counts [index] = 16;   /* max possible */
-                        program_drive_counts (index);
-                        set_prefetch_mode (index, 0);
+                        program_drive_counts(drive, index);
+                        set_prefetch_mode(drive, index, 0);
                         printk("cmd640: drive%d timings/prefetch cleared\n", index);
                 } else {
                         /*
@@ -855,7 +842,7 @@ static int __init cmd640x_init(void)
                          * This preserves any prior BIOS setup.
                          */
                         retrieve_drive_counts (index);
-                        check_prefetch (index);
+                        check_prefetch(drive, index);
                         printk("cmd640: drive%d timings/prefetch(%s) preserved",
                                 index, drive->no_io_32bit ? "off" : "on");
                         display_clocks(index);
@@ -864,7 +851,7 @@ static int __init cmd640x_init(void)
                 /*
                  * Set the drive unmask flags to match the prefetch setting
                  */
-                check_prefetch (index);
+                check_prefetch(drive, index);
                 printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
                         index, drive->no_io_32bit ? "off" : "on");
 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */