cy82c693: fix PIO timings calculations

Just use the standard ide_timing_compute() helper to calculate
PIO timings.  This fixes many issues with the open-coded version
like using 16-bit timings when 8-bit ones should be used or not
accounting for the enhanced cycle time specified by the device.

Based on libata pata_cypress host driver.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 86 deletions

diff --git a/drivers/ide/cy82c693.c b/drivers/ide/cy82c693.c
index d6e2cbbc53a0..49dfb8d40dcf 100644
--- a/drivers/ide/cy82c693.c
+++ b/drivers/ide/cy82c693.c
@@ -1,6 +1,7 @@
 /*
  *  Copyright (C) 1998-2000 Andreas S. Krebs (akrebs@altavista.net), Maintainer
  *  Copyright (C) 1998-2002 Andre Hedrick <andre@linux-ide.org>, Integrator
+ *  Copyright (C) 2007-2010 Bartlomiej Zolnierkiewicz
  *
  * CYPRESS CY82C693 chipset IDE controller
  *
@@ -81,80 +82,6 @@
 #define CY82_INDEX_CHANNEL1     0x31
 #define CY82_INDEX_TIMEOUT      0x32
 
-/* the min and max PCI bus speed in MHz - from datasheet */
-#define CY82C963_MIN_BUS_SPEED  25
-#define CY82C963_MAX_BUS_SPEED  33
-
-/* the struct for the PIO mode timings */
-typedef struct pio_clocks_s {
-        u8      address_time;   /* Address setup (clocks) */
-        u8      time_16r;       /* clocks for 16bit IOR (0xF0=Active/data, 0x0F=Recovery) */
-        u8      time_16w;       /* clocks for 16bit IOW (0xF0=Active/data, 0x0F=Recovery) */
-        u8      time_8;         /* clocks for 8bit (0xF0=Active/data, 0x0F=Recovery) */
-} pio_clocks_t;
-
-/*
- * calc clocks using bus_speed
- * returns (rounded up) time in bus clocks for time in ns
- */
-static int calc_clk(int time, int bus_speed)
-{
-        int clocks;
-
-        clocks = (time*bus_speed+999)/1000 - 1;
-
-        if (clocks < 0)
-                clocks = 0;
-
-        if (clocks > 0x0F)
-                clocks = 0x0F;
-
-        return clocks;
-}
-
-/*
- * compute the values for the clock registers for PIO
- * mode and pci_clk [MHz] speed
- *
- * NOTE: for mode 0,1 and 2 drives 8-bit IDE command control registers are used
- *       for mode 3 and 4 drives 8 and 16-bit timings are the same
- *
- */
-static void compute_clocks(u8 pio, pio_clocks_t *p_pclk)
-{
-        struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
-        int clk1, clk2;
-        int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
-
-        /* we don't check against CY82C693's min and max speed,
-         * so you can play with the idebus=xx parameter
-         */
-
-        /* let's calc the address setup time clocks */
-        p_pclk->address_time = (u8)calc_clk(t->setup, bus_speed);
-
-        /* let's calc the active and recovery time clocks */
-        clk1 = calc_clk(t->active, bus_speed);
-
-        /* calc recovery timing */
-        clk2 = t->cycle - t->active - t->setup;
-
-        clk2 = calc_clk(clk2, bus_speed);
-
-        clk1 = (clk1<<4)|clk2;  /* combine active and recovery clocks */
-
-        /* note: we use the same values for 16bit IOR and IOW
-         *      those are all the same, since I don't have other
-         *      timings than those from ide-lib.c
-         */
-
-        p_pclk->time_16r = (u8)clk1;
-        p_pclk->time_16w = (u8)clk1;
-
-        /* what are good values for 8bit ?? */
-        p_pclk->time_8 = (u8)clk1;
-}
-
 /*
  * set DMA mode a specific channel for CY82C693
  */
@@ -190,8 +117,11 @@ static void cy82c693_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
         ide_hwif_t *hwif = drive->hwif;
         struct pci_dev *dev = to_pci_dev(hwif->dev);
-        pio_clocks_t pclk;
+        int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
+        const unsigned long T = 1000000 / bus_speed;
         unsigned int addrCtrl;
+        struct ide_timing t;
+        u8 time_16, time_8;
 
         /* select primary or secondary channel */
         if (hwif->index > 0) {  /* drive is on the secondary channel */
@@ -204,8 +134,12 @@ static void cy82c693_set_pio_mode(ide_drive_t *drive, const u8 pio)
                 }
         }
 
-        /* let's calc the values for this PIO mode */
-        compute_clocks(pio, &pclk);
+        ide_timing_compute(drive, XFER_PIO_0 + pio, &t, T, 1);
+
+        time_16 = clamp_val(t.recover - 1, 0, 15) |
+                  (clamp_val(t.active - 1, 0, 15) << 4);
+        time_8 = clamp_val(t.act8b - 1, 0, 15) |
+                 (clamp_val(t.rec8b - 1, 0, 15) << 4);
 
         /* now let's write  the clocks registers */
         if ((drive->dn & 1) == 0) {
@@ -217,13 +151,13 @@ static void cy82c693_set_pio_mode(ide_drive_t *drive, const u8 pio)
                 pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
 
                 addrCtrl &= (~0xF);
-                addrCtrl |= (unsigned int)pclk.address_time;
+                addrCtrl |= clamp_val(t.setup - 1, 0, 15);
                 pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
 
                 /* now let's set the remaining registers */
-                pci_write_config_byte(dev, CY82_IDE_MASTER_IOR, pclk.time_16r);
-                pci_write_config_byte(dev, CY82_IDE_MASTER_IOW, pclk.time_16w);
-                pci_write_config_byte(dev, CY82_IDE_MASTER_8BIT, pclk.time_8);
+                pci_write_config_byte(dev, CY82_IDE_MASTER_IOR, time_16);
+                pci_write_config_byte(dev, CY82_IDE_MASTER_IOW, time_16);
+                pci_write_config_byte(dev, CY82_IDE_MASTER_8BIT, time_8);
         } else {
                 /*
                  * set slave drive
@@ -233,13 +167,13 @@ static void cy82c693_set_pio_mode(ide_drive_t *drive, const u8 pio)
                 pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
 
                 addrCtrl &= (~0xF0);
-                addrCtrl |= ((unsigned int)pclk.address_time<<4);
+                addrCtrl |= (clamp_val(t.setup - 1, 0, 15) << 4);
                 pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
 
                 /* now let's set the remaining registers */
-                pci_write_config_byte(dev, CY82_IDE_SLAVE_IOR, pclk.time_16r);
-                pci_write_config_byte(dev, CY82_IDE_SLAVE_IOW, pclk.time_16w);
-                pci_write_config_byte(dev, CY82_IDE_SLAVE_8BIT, pclk.time_8);
+                pci_write_config_byte(dev, CY82_IDE_SLAVE_IOR, time_16);
+                pci_write_config_byte(dev, CY82_IDE_SLAVE_IOW, time_16);
+                pci_write_config_byte(dev, CY82_IDE_SLAVE_8BIT, time_8);
         }
 }
 
@@ -325,6 +259,6 @@ static void __exit cy82c693_ide_exit(void)
 module_init(cy82c693_ide_init);
 module_exit(cy82c693_ide_exit);
 
-MODULE_AUTHOR("Andreas Krebs, Andre Hedrick");
+MODULE_AUTHOR("Andreas Krebs, Andre Hedrick, Bartlomiej Zolnierkiewicz");
 MODULE_DESCRIPTION("PCI driver module for the Cypress CY82C693 IDE");
 MODULE_LICENSE("GPL");