hpt366: simplify UltraDMA filtering (take 4)

Simplify UltraDMA mode filtering in the driver:

- make use of the newly introduced 'udma_mask' field of 'ide_pci_device_t' to
  set the correct hwif->ultra_mask, modifying init_setup_hpt366() to select
  the correct mask based on the chip revision;

- replace 'max_mode' field of the 'struct hpt_info' with 'max_ultra' specifying
  the maximum UltraDMA mode allowed;

- rewrite hpt3xx_udma_filter() to differ the filters based on the 'chip_type'
  field, and only use it for HPT366 and HPT370[A] where it's really necessary.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 82 insertions, 72 deletions

diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c
index 65018814ed73..ce363c923613 100644
--- a/drivers/ide/pci/hpt366.c
+++ b/drivers/ide/pci/hpt366.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/hpt366.c               Version 1.06    Jun 27, 2007
+ * linux/drivers/ide/pci/hpt366.c               Version 1.10    Jun 29, 2007
  *
  * Copyright (C) 1999-2003              Andre Hedrick <andre@linux-ide.org>
  * Portions Copyright (C) 2001          Sun Microsystems, Inc.
@@ -77,7 +77,7 @@
  *   since they may tamper with its fields
  * - prefix the driver startup messages with the real chip name
  * - claim the extra 240 bytes of I/O space for all chips
- * - optimize the rate masking/filtering and the drive list lookup code
+ * - optimize the UltraDMA filtering and the drive list lookup code
  * - use pci_get_slot() to get to the function 1 of HPT36x/374
  * - cache offset of the channel's misc. control registers (MCRs) being used
  *   throughout the driver
@@ -99,9 +99,9 @@
  *   stop duplicating it for each channel by storing the pointer in the pci_dev
  *   structure: first, at the init_setup stage, point it to a static "template"
  *   with only the chip type and its specific base DPLL frequency, the highest
- *   supported DMA mode, and the chip settings table pointer filled, then, at
- *   the init_chipset stage, allocate per-chip instance  and fill it with the
- *   rest of the necessary information
+ *   UltraDMA mode, and the chip settings table pointer filled,  then, at the
+ *   init_chipset stage, allocate per-chip instance  and fill it with the rest
+ *   of the necessary information
  * - get rid of the constant thresholds in the HPT37x PCI clock detection code,
  *   switch  to calculating  PCI clock frequency based on the chip's base DPLL
  *   frequency
@@ -112,6 +112,7 @@
  *   also fixing the interchanged 25/40 MHz PCI clock cases for HPT36x chips;
  *   unify HPT36x/37x timing setup code and the speedproc handlers by joining
  *   the register setting lists into the table indexed by the clock selected
+ * - set the correct hwif->ultra_mask for each individual chip
  *      Sergei Shtylyov, <sshtylyov@ru.mvista.com> or <source@mvista.com>
  */
 
@@ -391,7 +392,7 @@ enum ata_clock {
 
 struct hpt_info {
         u8 chip_type;           /* Chip type */
-        u8 max_mode;            /* Speeds allowed */
+        u8 max_ultra;           /* Max. UltraDMA mode allowed */
         u8 dpll_clk;            /* DPLL clock in MHz */
         u8 pci_clk;             /* PCI  clock in MHz */
         u32 **settings;         /* Chipset settings table */
@@ -430,77 +431,77 @@ static u32 *hpt37x_settings[NUM_ATA_CLOCKS] = {
 
 static struct hpt_info hpt36x __devinitdata = {
         .chip_type      = HPT36x,
-        .max_mode       = (HPT366_ALLOW_ATA66_4 || HPT366_ALLOW_ATA66_3) ? 2 : 1,
+        .max_ultra      = HPT366_ALLOW_ATA66_3 ? (HPT366_ALLOW_ATA66_4 ? 4 : 3) : 2,
         .dpll_clk       = 0,    /* no DPLL */
         .settings       = hpt36x_settings
 };
 
 static struct hpt_info hpt370 __devinitdata = {
         .chip_type      = HPT370,
-        .max_mode       = HPT370_ALLOW_ATA100_5 ? 3 : 2,
+        .max_ultra      = HPT370_ALLOW_ATA100_5 ? 5 : 4,
         .dpll_clk       = 48,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt370a __devinitdata = {
         .chip_type      = HPT370A,
-        .max_mode       = HPT370_ALLOW_ATA100_5 ? 3 : 2,
+        .max_ultra      = HPT370_ALLOW_ATA100_5 ? 5 : 4,
         .dpll_clk       = 48,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt374 __devinitdata = {
         .chip_type      = HPT374,
-        .max_mode       = 3,
+        .max_ultra      = 5,
         .dpll_clk       = 48,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt372 __devinitdata = {
         .chip_type      = HPT372,
-        .max_mode       = HPT372_ALLOW_ATA133_6 ? 4 : 3,
+        .max_ultra      = HPT372_ALLOW_ATA133_6 ? 6 : 5,
         .dpll_clk       = 55,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt372a __devinitdata = {
         .chip_type      = HPT372A,
-        .max_mode       = HPT372_ALLOW_ATA133_6 ? 4 : 3,
+        .max_ultra      = HPT372_ALLOW_ATA133_6 ? 6 : 5,
         .dpll_clk       = 66,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt302 __devinitdata = {
         .chip_type      = HPT302,
-        .max_mode       = HPT302_ALLOW_ATA133_6 ? 4 : 3,
+        .max_ultra      = HPT372_ALLOW_ATA133_6 ? 6 : 5,
         .dpll_clk       = 66,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt371 __devinitdata = {
         .chip_type      = HPT371,
-        .max_mode       = HPT371_ALLOW_ATA133_6 ? 4 : 3,
+        .max_ultra      = HPT371_ALLOW_ATA133_6 ? 6 : 5,
         .dpll_clk       = 66,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt372n __devinitdata = {
         .chip_type      = HPT372N,
-        .max_mode       = HPT372_ALLOW_ATA133_6 ? 4 : 3,
+        .max_ultra      = HPT372_ALLOW_ATA133_6 ? 6 : 5,
         .dpll_clk       = 77,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt302n __devinitdata = {
         .chip_type      = HPT302N,
-        .max_mode       = HPT302_ALLOW_ATA133_6 ? 4 : 3,
+        .max_ultra      = HPT302_ALLOW_ATA133_6 ? 6 : 5,
         .dpll_clk       = 77,
         .settings       = hpt37x_settings
 };
 
 static struct hpt_info hpt371n __devinitdata = {
         .chip_type      = HPT371N,
-        .max_mode       = HPT371_ALLOW_ATA133_6 ? 4 : 3,
+        .max_ultra      = HPT371_ALLOW_ATA133_6 ? 6 : 5,
         .dpll_clk       = 77,
         .settings       = hpt37x_settings
 };
@@ -523,53 +524,38 @@ static int check_in_drive_list(ide_drive_t *drive, const char **list)
 static u8 hpt3xx_udma_filter(ide_drive_t *drive)
 {
         struct hpt_info *info   = pci_get_drvdata(HWIF(drive)->pci_dev);
-        u8 chip_type            = info->chip_type;
-        u8 mode                 = info->max_mode;
         u8 mask;
 
-        switch (mode) {
-                case 0x04:
-                        mask = 0x7f;
-                        break;
-                case 0x03:
+        switch (info->chip_type) {
+        case HPT370A:
+                if (!HPT370_ALLOW_ATA100_5 ||
+                    check_in_drive_list(drive, bad_ata100_5))
+                        return 0x1f;
+                else
+                        return 0x3f;
+        case HPT370:
+                if (!HPT370_ALLOW_ATA100_5 ||
+                    check_in_drive_list(drive, bad_ata100_5))
+                        mask = 0x1f;
+                else
                         mask = 0x3f;
-                        if (chip_type >= HPT374)
-                                break;
-                        if (!check_in_drive_list(drive, bad_ata100_5))
-                                goto check_bad_ata33;
-                        /* fall thru */
-                case 0x02:
+                break;
+        case HPT36x:
+                if (!HPT366_ALLOW_ATA66_4 ||
+                    check_in_drive_list(drive, bad_ata66_4))
+                        mask = 0x0f;
+                else
                         mask = 0x1f;
 
-                        /*
-                         * CHECK ME, Does this need to be changed to HPT374 ??
-                         */
-                        if (chip_type >= HPT370)
-                                goto check_bad_ata33;
-                        if (HPT366_ALLOW_ATA66_4 &&
-                            !check_in_drive_list(drive, bad_ata66_4))
-                                goto check_bad_ata33;
-
-                        mask = 0x0f;
-                        if (HPT366_ALLOW_ATA66_3 &&
-                            !check_in_drive_list(drive, bad_ata66_3))
-                                goto check_bad_ata33;
-                        /* fall thru */
-                case 0x01:
+                if (!HPT366_ALLOW_ATA66_3 ||
+                    check_in_drive_list(drive, bad_ata66_3))
                         mask = 0x07;
-
-                check_bad_ata33:
-                        if (chip_type >= HPT370A)
-                                break;
-                        if (!check_in_drive_list(drive, bad_ata33))
-                                break;
-                        /* fall thru */
-                case 0x00:
-                default:
-                        mask = 0x00;
-                        break;
+                break;
+        default:
+                return 0x7f;
         }
-        return mask;
+
+        return check_in_drive_list(drive, bad_ata33) ? 0x00 : mask;
 }
 
 static u32 get_speed_setting(u8 speed, struct hpt_info *info)
@@ -1150,7 +1136,7 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
                   * Select 66 MHz DPLL clock only if UltraATA/133 mode is
                   * supported/enabled, use 50 MHz DPLL clock otherwise...
                   */
-                if (info->max_mode == 0x04) {
+                if (info->max_ultra == 6) {
                         dpll_clk = 66;
                         clock = ATA_CLOCK_66MHZ;
                 } else if (dpll_clk) {  /* HPT36x chips don't have DPLL */
@@ -1243,7 +1229,7 @@ static void __devinit init_hwif_hpt366(ide_hwif_t *hwif)
         struct pci_dev  *dev            = hwif->pci_dev;
         struct hpt_info *info           = pci_get_drvdata(dev);
         int serialize                   = HPT_SERIALIZE_IO;
-        u8  scr1 = 0, ata66             = (hwif->channel) ? 0x01 : 0x02;
+        u8  scr1 = 0, ata66             = hwif->channel ? 0x01 : 0x02;
         u8  chip_type                   = info->chip_type;
         u8  new_mcr, old_mcr            = 0;
 
@@ -1256,7 +1242,9 @@ static void __devinit init_hwif_hpt366(ide_hwif_t *hwif)
         hwif->intrproc                  = &hpt3xx_intrproc;
         hwif->maskproc                  = &hpt3xx_maskproc;
         hwif->busproc                   = &hpt3xx_busproc;
-        hwif->udma_filter               = &hpt3xx_udma_filter;
+
+        if (chip_type <= HPT370A)
+                hwif->udma_filter       = &hpt3xx_udma_filter;
 
         /*
          * HPT3xxN chips have some complications:
@@ -1305,7 +1293,7 @@ static void __devinit init_hwif_hpt366(ide_hwif_t *hwif)
                 return;
         }
 
-        hwif->ultra_mask = 0x7f;
+        hwif->ultra_mask = hwif->cds->udma_mask;
         hwif->mwdma_mask = 0x07;
 
         /*
@@ -1503,9 +1491,35 @@ static int __devinit init_setup_hpt366(struct pci_dev *dev, ide_pci_device_t *d)
 
         pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
 
-        if (rev > 6)
+        switch (rev) {
+        case 0:
+        case 1:
+        case 2:
+                /*
+                 * HPT36x chips have one channel per function and have
+                 * both channel enable bits located differently and visible
+                 * to both functions -- really stupid design decision... :-(
+                 * Bit 4 is for the primary channel, bit 5 for the secondary.
+                 */
+                d->channels = 1;
+                d->enablebits[0].mask = d->enablebits[0].val = 0x10;
+
+                d->udma_mask = HPT366_ALLOW_ATA66_3 ?
+                              (HPT366_ALLOW_ATA66_4 ? 0x1f : 0x0f) : 0x07;
+                break;
+        case 3:
+        case 4:
+                d->udma_mask = HPT370_ALLOW_ATA100_5 ? 0x3f : 0x1f;
+                break;
+        default:
                 rev = 6;
-                
+                /* fall thru */
+        case 5:
+        case 6:
+                d->udma_mask = HPT372_ALLOW_ATA133_6 ? 0x7f : 0x3f;
+                break;
+        }
+
         d->name = chipset_names[rev];
 
         pci_set_drvdata(dev, info[rev]);
@@ -1513,15 +1527,6 @@ static int __devinit init_setup_hpt366(struct pci_dev *dev, ide_pci_device_t *d)
         if (rev > 2)
                 goto init_single;
 
-        /*
-         * HPT36x chips have one channel per function and have
-         * both channel enable bits located differently and visible
-         * to both functions -- really stupid design decision... :-(
-         * Bit 4 is for the primary channel, bit 5 for the secondary.
-         */
-        d->channels = 1;
-        d->enablebits[0].mask = d->enablebits[0].val = 0x10;
-
         if ((dev2 = pci_get_slot(dev->bus, dev->devfn + 1)) != NULL) {
                 u8  mcr1 = 0, pin1 = 0, pin2 = 0;
                 int ret;
@@ -1573,6 +1578,7 @@ static ide_pci_device_t hpt366_chipsets[] __devinitdata = {
                 .channels       = 2,
                 .autodma        = AUTODMA,
                 .enablebits     = {{0x50,0x04,0x04}, {0x54,0x04,0x04}},
+                .udma_mask      = HPT372_ALLOW_ATA133_6 ? 0x7f : 0x3f,
                 .bootable       = OFF_BOARD,
                 .extra          = 240
         },{     /* 2 */
@@ -1584,6 +1590,7 @@ static ide_pci_device_t hpt366_chipsets[] __devinitdata = {
                 .channels       = 2,
                 .autodma        = AUTODMA,
                 .enablebits     = {{0x50,0x04,0x04}, {0x54,0x04,0x04}},
+                .udma_mask      = HPT302_ALLOW_ATA133_6 ? 0x7f : 0x3f,
                 .bootable       = OFF_BOARD,
                 .extra          = 240
         },{     /* 3 */
@@ -1595,6 +1602,7 @@ static ide_pci_device_t hpt366_chipsets[] __devinitdata = {
                 .channels       = 2,
                 .autodma        = AUTODMA,
                 .enablebits     = {{0x50,0x04,0x04}, {0x54,0x04,0x04}},
+                .udma_mask      = HPT371_ALLOW_ATA133_6 ? 0x7f : 0x3f,
                 .bootable       = OFF_BOARD,
                 .extra          = 240
         },{     /* 4 */
@@ -1606,6 +1614,7 @@ static ide_pci_device_t hpt366_chipsets[] __devinitdata = {
                 .channels       = 2,    /* 4 */
                 .autodma        = AUTODMA,
                 .enablebits     = {{0x50,0x04,0x04}, {0x54,0x04,0x04}},
+                .udma_mask      = 0x3f,
                 .bootable       = OFF_BOARD,
                 .extra          = 240
         },{     /* 5 */
@@ -1617,6 +1626,7 @@ static ide_pci_device_t hpt366_chipsets[] __devinitdata = {
                 .channels       = 2,    /* 4 */
                 .autodma        = AUTODMA,
                 .enablebits     = {{0x50,0x04,0x04}, {0x54,0x04,0x04}},
+                .udma_mask      = HPT372_ALLOW_ATA133_6 ? 0x7f : 0x3f,
                 .bootable       = OFF_BOARD,
                 .extra          = 240
         }