[PATCH] via82cxxx IDE: support multiple controllers

Support multiple controllers in the via82cxxx IDE driver.
Cable detection and ISA bridge finding have been moved into
their own functions.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 117 insertions, 78 deletions

diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index 2fbc215988ab..cee2c374cd2f 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -100,11 +100,15 @@ static struct via_isa_bridge {
         { NULL }
 };
 
-static struct via_isa_bridge *via_config;
-static unsigned int via_80w;
 static unsigned int via_clock;
 static char *via_dma[] = { "MWDMA16", "UDMA33", "UDMA66", "UDMA100", "UDMA133" };
 
+struct via82cxxx_dev
+{
+        struct via_isa_bridge *via_config;
+        unsigned int via_80w;
+};
+
 /**
  *      via_set_speed                   -       write timing registers
  *      @dev: PCI device
@@ -114,11 +118,13 @@ static char *via_dma[] = { "MWDMA16", "UDMA33", "UDMA66", "UDMA100", "UDMA133" }
  *      via_set_speed writes timing values to the chipset registers
  */
 
-static void via_set_speed(struct pci_dev *dev, u8 dn, struct ide_timing *timing)
+static void via_set_speed(ide_hwif_t *hwif, u8 dn, struct ide_timing *timing)
 {
+        struct pci_dev *dev = hwif->pci_dev;
+        struct via82cxxx_dev *vdev = ide_get_hwifdata(hwif);
         u8 t;
 
-        if (~via_config->flags & VIA_BAD_AST) {
+        if (~vdev->via_config->flags & VIA_BAD_AST) {
                 pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
                 t = (t & ~(3 << ((3 - dn) << 1))) | ((FIT(timing->setup, 1, 4) - 1) << ((3 - dn) << 1));
                 pci_write_config_byte(dev, VIA_ADDRESS_SETUP, t);
@@ -130,7 +136,7 @@ static void via_set_speed(struct pci_dev *dev, u8 dn, struct ide_timing *timing)
         pci_write_config_byte(dev, VIA_DRIVE_TIMING + (3 - dn),
                 ((FIT(timing->active, 1, 16) - 1) << 4) | (FIT(timing->recover, 1, 16) - 1));
 
-        switch (via_config->flags & VIA_UDMA) {
+        switch (vdev->via_config->flags & VIA_UDMA) {
                 case VIA_UDMA_33:  t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 5) - 2)) : 0x03; break;
                 case VIA_UDMA_66:  t = timing->udma ? (0xe8 | (FIT(timing->udma, 2, 9) - 2)) : 0x0f; break;
                 case VIA_UDMA_100: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
@@ -154,6 +160,7 @@ static void via_set_speed(struct pci_dev *dev, u8 dn, struct ide_timing *timing)
 static int via_set_drive(ide_drive_t *drive, u8 speed)
 {
         ide_drive_t *peer = HWIF(drive)->drives + (~drive->dn & 1);
+        struct via82cxxx_dev *vdev = ide_get_hwifdata(drive->hwif);
         struct ide_timing t, p;
         unsigned int T, UT;
 
@@ -162,7 +169,7 @@ static int via_set_drive(ide_drive_t *drive, u8 speed)
 
         T = 1000000000 / via_clock;
 
-        switch (via_config->flags & VIA_UDMA) {
+        switch (vdev->via_config->flags & VIA_UDMA) {
                 case VIA_UDMA_33:   UT = T;   break;
                 case VIA_UDMA_66:   UT = T/2; break;
                 case VIA_UDMA_100:  UT = T/3; break;
@@ -177,7 +184,7 @@ static int via_set_drive(ide_drive_t *drive, u8 speed)
                 ide_timing_merge(&p, &t, &t, IDE_TIMING_8BIT);
         }
 
-        via_set_speed(HWIF(drive)->pci_dev, drive->dn, &t);
+        via_set_speed(HWIF(drive), drive->dn, &t);
 
         if (!drive->init_speed)
                 drive->init_speed = speed;
@@ -215,20 +222,41 @@ static void via82cxxx_tune_drive(ide_drive_t *drive, u8 pio)
  
 static int via82cxxx_ide_dma_check (ide_drive_t *drive)
 {
-        u16 w80 = HWIF(drive)->udma_four;
+        ide_hwif_t *hwif = HWIF(drive);
+        struct via82cxxx_dev *vdev = ide_get_hwifdata(hwif);
+        u16 w80 = hwif->udma_four;
 
         u16 speed = ide_find_best_mode(drive,
                 XFER_PIO | XFER_EPIO | XFER_SWDMA | XFER_MWDMA |
-                (via_config->flags & VIA_UDMA ? XFER_UDMA : 0) |
-                (w80 && (via_config->flags & VIA_UDMA) >= VIA_UDMA_66 ? XFER_UDMA_66 : 0) |
-                (w80 && (via_config->flags & VIA_UDMA) >= VIA_UDMA_100 ? XFER_UDMA_100 : 0) |
-                (w80 && (via_config->flags & VIA_UDMA) >= VIA_UDMA_133 ? XFER_UDMA_133 : 0));
+                (vdev->via_config->flags & VIA_UDMA ? XFER_UDMA : 0) |
+                (w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_66 ? XFER_UDMA_66 : 0) |
+                (w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_100 ? XFER_UDMA_100 : 0) |
+                (w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_133 ? XFER_UDMA_133 : 0));
 
         via_set_drive(drive, speed);
 
         if (drive->autodma && (speed & XFER_MODE) != XFER_PIO)
-                return HWIF(drive)->ide_dma_on(drive);
-        return HWIF(drive)->ide_dma_off_quietly(drive);
+                return hwif->ide_dma_on(drive);
+        return hwif->ide_dma_off_quietly(drive);
+}
+
+static struct via_isa_bridge *via_config_find(struct pci_dev **isa)
+{
+        struct via_isa_bridge *via_config;
+        u8 t;
+
+        for (via_config = via_isa_bridges; via_config->id; via_config++)
+                if ((*isa = pci_find_device(PCI_VENDOR_ID_VIA +
+                        !!(via_config->flags & VIA_BAD_ID),
+                        via_config->id, NULL))) {
+
+                        pci_read_config_byte(*isa, PCI_REVISION_ID, &t);
+                        if (t >= via_config->rev_min &&
+                            t <= via_config->rev_max)
+                                break;
+                }
+
+        return via_config;
 }
 
 /**
@@ -243,82 +271,28 @@ static int via82cxxx_ide_dma_check (ide_drive_t *drive)
 static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const char *name)
 {
         struct pci_dev *isa = NULL;
+        struct via_isa_bridge *via_config;
         u8 t, v;
         unsigned int u;
-        int i;
 
         /*
          * Find the ISA bridge to see how good the IDE is.
          */
-
-        for (via_config = via_isa_bridges; via_config->id; via_config++)
-                if ((isa = pci_find_device(PCI_VENDOR_ID_VIA +
-                        !!(via_config->flags & VIA_BAD_ID),
-                        via_config->id, NULL))) {
-
-                        pci_read_config_byte(isa, PCI_REVISION_ID, &t);
-                        if (t >= via_config->rev_min &&
-                            t <= via_config->rev_max)
-                                break;
-                }
-
+        via_config = via_config_find(&isa);
         if (!via_config->id) {
                 printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, disabling DMA.\n");
                 return -ENODEV;
         }
 
         /*
-         * Check 80-wire cable presence and setup Clk66.
+         * Setup or disable Clk66 if appropriate
          */
 
-        switch (via_config->flags & VIA_UDMA) {
-
-                case VIA_UDMA_66:
-                        /* Enable Clk66 */
-                        pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
-                        pci_write_config_dword(dev, VIA_UDMA_TIMING, u|0x80008);
-                        for (i = 24; i >= 0; i -= 8)
-                                if (((u >> (i & 16)) & 8) &&
-                                    ((u >> i) & 0x20) &&
-                                     (((u >> i) & 7) < 2)) {
-                                        /*
-                                         * 2x PCI clock and
-                                         * UDMA w/ < 3T/cycle
-                                         */
-                                        via_80w |= (1 << (1 - (i >> 4)));
-                                }
-                        break;
-
-                case VIA_UDMA_100:
-                        pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
-                        for (i = 24; i >= 0; i -= 8)
-                                if (((u >> i) & 0x10) ||
-                                    (((u >> i) & 0x20) &&
-                                     (((u >> i) & 7) < 4))) {
-                                        /* BIOS 80-wire bit or
-                                         * UDMA w/ < 60ns/cycle
-                                         */
-                                        via_80w |= (1 << (1 - (i >> 4)));
-                                }
-                        break;
-
-                case VIA_UDMA_133:
-                        pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
-                        for (i = 24; i >= 0; i -= 8)
-                                if (((u >> i) & 0x10) ||
-                                    (((u >> i) & 0x20) &&
-                                     (((u >> i) & 7) < 6))) {
-                                        /* BIOS 80-wire bit or
-                                         * UDMA w/ < 60ns/cycle
-                                         */
-                                        via_80w |= (1 << (1 - (i >> 4)));
-                                }
-                        break;
-
-        }
-
-        /* Disable Clk66 */
-        if (via_config->flags & VIA_BAD_CLK66) {
+        if ((via_config->flags & VIA_UDMA) == VIA_UDMA_66) {
+                /* Enable Clk66 */
+                pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
+                pci_write_config_dword(dev, VIA_UDMA_TIMING, u|0x80008);
+        } else if (via_config->flags & VIA_BAD_CLK66) {
                 /* Would cause trouble on 596a and 686 */
                 pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
                 pci_write_config_dword(dev, VIA_UDMA_TIMING, u & ~0x80008);
@@ -388,10 +362,75 @@ static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const
         return 0;
 }
 
+/*
+ * Check and handle 80-wire cable presence
+ */
+static void __devinit via_cable_detect(struct pci_dev *dev, struct via82cxxx_dev *vdev)
+{
+        unsigned int u;
+        int i;
+        pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
+
+        switch (vdev->via_config->flags & VIA_UDMA) {
+
+                case VIA_UDMA_66:
+                        for (i = 24; i >= 0; i -= 8)
+                                if (((u >> (i & 16)) & 8) &&
+                                    ((u >> i) & 0x20) &&
+                                     (((u >> i) & 7) < 2)) {
+                                        /*
+                                         * 2x PCI clock and
+                                         * UDMA w/ < 3T/cycle
+                                         */
+                                        vdev->via_80w |= (1 << (1 - (i >> 4)));
+                                }
+                        break;
+
+                case VIA_UDMA_100:
+                        for (i = 24; i >= 0; i -= 8)
+                                if (((u >> i) & 0x10) ||
+                                    (((u >> i) & 0x20) &&
+                                     (((u >> i) & 7) < 4))) {
+                                        /* BIOS 80-wire bit or
+                                         * UDMA w/ < 60ns/cycle
+                                         */
+                                        vdev->via_80w |= (1 << (1 - (i >> 4)));
+                                }
+                        break;
+
+                case VIA_UDMA_133:
+                        for (i = 24; i >= 0; i -= 8)
+                                if (((u >> i) & 0x10) ||
+                                    (((u >> i) & 0x20) &&
+                                     (((u >> i) & 7) < 6))) {
+                                        /* BIOS 80-wire bit or
+                                         * UDMA w/ < 60ns/cycle
+                                         */
+                                        vdev->via_80w |= (1 << (1 - (i >> 4)));
+                                }
+                        break;
+
+        }
+}
+
 static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
 {
+        struct via82cxxx_dev *vdev = kmalloc(sizeof(struct via82cxxx_dev),
+                GFP_KERNEL);
+        struct pci_dev *isa = NULL;
         int i;
 
+        if (vdev == NULL) {
+                printk(KERN_ERR "VP_IDE: out of memory :(\n");
+                return;
+        }
+
+        memset(vdev, 0, sizeof(struct via82cxxx_dev));
+        ide_set_hwifdata(hwif, vdev);
+
+        vdev->via_config = via_config_find(&isa);
+        via_cable_detect(hwif->pci_dev, vdev);
+
         hwif->autodma = 0;
 
         hwif->tuneproc = &via82cxxx_tune_drive;
@@ -406,7 +445,7 @@ static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
 
         for (i = 0; i < 2; i++) {
                 hwif->drives[i].io_32bit = 1;
-                hwif->drives[i].unmask = (via_config->flags & VIA_NO_UNMASK) ? 0 : 1;
+                hwif->drives[i].unmask = (vdev->via_config->flags & VIA_NO_UNMASK) ? 0 : 1;
                 hwif->drives[i].autotune = 1;
                 hwif->drives[i].dn = hwif->channel * 2 + i;
         }
@@ -420,7 +459,7 @@ static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
         hwif->swdma_mask = 0x07;
 
         if (!hwif->udma_four)
-                hwif->udma_four = (via_80w >> hwif->channel) & 1;
+                hwif->udma_four = (vdev->via_80w >> hwif->channel) & 1;
         hwif->ide_dma_check = &via82cxxx_ide_dma_check;
         if (!noautodma)
                 hwif->autodma = 1;