hpt366: fix PCI clock detection for HPT374 (take 4)

HPT374 BIOS seems to only save f_CNT register value for the function #0 before
re-tuning DPLL (that causes the driver to report obviously distorted f_CNT for
the function #1) -- fix this by always reading the saved f_CNT register value
from the function #0 in the driver's init_chipset() method.
While at it, introduce 'chip_type' for holding the 'struct hpt_info' field
of the same name and replace the structure assignment with memcpy()...

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

1 files changed, 31 insertions, 13 deletions

diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c
index 2cd74c345a6c..f87eec970574 100644
--- a/drivers/ide/pci/hpt366.c
+++ b/drivers/ide/pci/hpt366.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/hpt366.c               Version 1.10    Jun 29, 2007
+ * linux/drivers/ide/pci/hpt366.c               Version 1.11    Aug 11, 2007
  *
  * Copyright (C) 1999-2003              Andre Hedrick <andre@linux-ide.org>
  * Portions Copyright (C) 2001          Sun Microsystems, Inc.
@@ -68,7 +68,8 @@
  *   HPT37x chip family; save space by introducing the separate transfer mode
  *   table in which the mode lookup is done
  * - use f_CNT value saved by  the HighPoint BIOS as reading it directly gives
- *   the wrong PCI frequency since DPLL has already been calibrated by BIOS
+ *   the wrong PCI frequency since DPLL has already been calibrated by BIOS;
+ *   read it only from the function 0 of HPT374 chips
  * - fix the hotswap code:  it caused RESET- to glitch when tristating the bus,
  *   and for HPT36x the obsolete HDIO_TRISTATE_HWIF handler was called instead
  * - pass to init_chipset() handlers a copy of the IDE PCI device structure as
@@ -981,6 +982,7 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
         struct hpt_info *info   = kmalloc(sizeof(struct hpt_info), GFP_KERNEL);
         unsigned long io_base   = pci_resource_start(dev, 4);
         u8 pci_clk,  dpll_clk   = 0;    /* PCI and DPLL clock in MHz */
+        u8 chip_type;
         enum ata_clock  clock;
 
         if (info == NULL) {
@@ -992,7 +994,8 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
          * Copy everything from a static "template" structure
          * to just allocated per-chip hpt_info structure.
          */
-        *info = *(struct hpt_info *)pci_get_drvdata(dev);
+        memcpy(info, pci_get_drvdata(dev), sizeof(struct hpt_info));
+        chip_type = info->chip_type;
 
         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, (L1_CACHE_BYTES / 4));
         pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x78);
@@ -1002,7 +1005,7 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
         /*
          * First, try to estimate the PCI clock frequency...
          */
-        if (info->chip_type >= HPT370) {
+        if (chip_type >= HPT370) {
                 u8  scr1  = 0;
                 u16 f_cnt = 0;
                 u32 temp  = 0;
@@ -1016,7 +1019,7 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
                  * HighPoint does this for HPT372A.
                  * NOTE: This register is only writeable via I/O space.
                  */
-                if (info->chip_type == HPT372A)
+                if (chip_type == HPT372A)
                         outb(0x0e, io_base + 0x9c);
 
                 /*
@@ -1034,13 +1037,28 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
                  * First try reading the register in which the HighPoint BIOS
                  * saves f_CNT value before  reprogramming the DPLL from its
                  * default setting (which differs for the various chips).
-                 * NOTE: This register is only accessible via I/O space.
                  *
-                 * In case the signature check fails, we'll have to resort to
-                 * reading the f_CNT register itself in hopes that nobody has
-                 * touched the DPLL yet...
+                 * NOTE: This register is only accessible via I/O space;
+                 * HPT374 BIOS only saves it for the function 0, so we have to
+                 * always read it from there -- no need to check the result of
+                 * pci_get_slot() for the function 0 as the whole device has
+                 * been already "pinned" (via function 1) in init_setup_hpt374()
+                 */
+                if (chip_type == HPT374 && (PCI_FUNC(dev->devfn) & 1)) {
+                        struct pci_dev  *dev1 = pci_get_slot(dev->bus,
+                                                             dev->devfn - 1);
+                        unsigned long io_base = pci_resource_start(dev1, 4);
+
+                        temp =  inl(io_base + 0x90);
+                        pci_dev_put(dev1);
+                } else
+                        temp =  inl(io_base + 0x90);
+
+                /*
+                 * In case the signature check fails, we'll have to
+                 * resort to reading the f_CNT register itself in hopes
+                 * that nobody has touched the DPLL yet...
                  */
-                temp = inl(io_base + 0x90);
                 if ((temp & 0xFFFFF000) != 0xABCDE000) {
                         int i;
 
@@ -1120,7 +1138,7 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
          * We also  don't like using  the DPLL because this causes glitches
          * on PRST-/SRST- when the state engine gets reset...
          */
-        if (info->chip_type >= HPT374 || info->settings[clock] == NULL) {
+        if (chip_type >= HPT374 || info->settings[clock] == NULL) {
                 u16 f_low, delta = pci_clk < 50 ? 2 : 4;
                 int adjust;
 
@@ -1190,7 +1208,7 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
         /* Point to this chip's own instance of the hpt_info structure. */
         pci_set_drvdata(dev, info);
 
-        if (info->chip_type >= HPT370) {
+        if (chip_type >= HPT370) {
                 u8  mcr1, mcr4;
 
                 /*
@@ -1209,7 +1227,7 @@ static unsigned int __devinit init_chipset_hpt366(struct pci_dev *dev, const cha
          * the MISC. register to stretch the UltraDMA Tss timing.
          * NOTE: This register is only writeable via I/O space.
          */
-        if (info->chip_type == HPT371N && clock == ATA_CLOCK_66MHZ)
+        if (chip_type == HPT371N && clock == ATA_CLOCK_66MHZ)
 
                 outb(inb(io_base + 0x9c) | 0x04, io_base + 0x9c);