ide: move IRQ clearing from ack_intr() method to clear_irq() method (take 2)

There are now two methods that clear the port interrupt: ack_intr() method,
implemented only on M680x0 machines, that is called at the start of ide_intr(),
and clear_irq() method, that is called somewhat later in this function.  In
order to stop this duplication, delegate the task of clearing the interrupt
to clear_irq() method, only leaving to ack_intr() the task of testing for the
port interrupt.

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

4 files changed, 38 insertions, 32 deletions

diff --git a/drivers/ide/buddha.c b/drivers/ide/buddha.c
index e3c6a5913305..9cd7b115763d 100644
--- a/drivers/ide/buddha.c
+++ b/drivers/ide/buddha.c
@@ -109,16 +109,12 @@ static int buddha_ack_intr(ide_hwif_t *hwif)
     return 1;
 }
 
-static int xsurf_ack_intr(ide_hwif_t *hwif)
+static void xsurf_clear_irq(ide_drive_t *drive)
 {
-    unsigned char ch;
-
-    ch = z_readb(hwif->io_ports.irq_addr);
-    /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
-    z_writeb(0, hwif->io_ports.irq_addr);
-    if (!(ch & 0x80))
-            return 0;
-    return 1;
+    /*
+     * X-Surf needs 0 written to IRQ register to ensure ISA bit A11 stays at 0
+     */
+    z_writeb(0, drive->hwif->io_ports.irq_addr);
 }
 
 static void __init buddha_setup_ports(struct ide_hw *hw, unsigned long base,
@@ -141,6 +137,10 @@ static void __init buddha_setup_ports(struct ide_hw *hw, unsigned long base,
         hw->ack_intr = ack_intr;
 }
 
+static const struct ide_port_ops xsurf_port_ops = {
+        .clear_irq              = xsurf_clear_irq,
+};
+
 static const struct ide_port_info buddha_port_info = {
         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
         .irq_flags              = IRQF_SHARED,
@@ -161,6 +161,7 @@ static int __init buddha_init(void)
         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
                 unsigned long board;
                 struct ide_hw hw[MAX_NUM_HWIFS], *hws[MAX_NUM_HWIFS];
+                struct ide_port_info d = buddha_port_info;
 
                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
@@ -171,6 +172,7 @@ static int __init buddha_init(void)
                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
                         buddha_num_hwifs = XSURF_NUM_HWIFS;
                         type=BOARD_XSURF;
+                        d.port_ops = &xsurf_port_ops;
                 } else 
                         continue;
                 
@@ -203,28 +205,25 @@ fail_base2:
 
                 for (i = 0; i < buddha_num_hwifs; i++) {
                         unsigned long base, ctl, irq_port;
-                        ide_ack_intr_t *ack_intr;
 
                         if (type != BOARD_XSURF) {
                                 base = buddha_board + buddha_bases[i];
                                 ctl = base + BUDDHA_CONTROL;
                                 irq_port = buddha_board + buddha_irqports[i];
-                                ack_intr = buddha_ack_intr;
                         } else {
                                 base = buddha_board + xsurf_bases[i];
                                 /* X-Surf has no CS1* (Control/AltStat) */
                                 ctl = 0;
                                 irq_port = buddha_board + xsurf_irqports[i];
-                                ack_intr = xsurf_ack_intr;
                         }
 
                         buddha_setup_ports(&hw[i], base, ctl, irq_port,
-                                           ack_intr);
+                                           buddha_ack_intr);
 
                         hws[i] = &hw[i];
                 }
 
-                ide_host_add(&buddha_port_info, hws, i, NULL);
+                ide_host_add(&d, hws, i, NULL);
         }
 
         return 0;
diff --git a/drivers/ide/gayle.c b/drivers/ide/gayle.c
index 4451a6a5dfe0..c5dd1e5cca4d 100644
--- a/drivers/ide/gayle.c
+++ b/drivers/ide/gayle.c
@@ -66,7 +66,7 @@ MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
      *  Check and acknowledge the interrupt status
      */
 
-static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
+static int gayle_ack_intr(ide_hwif_t *hwif)
 {
     unsigned char ch;
 
@@ -76,16 +76,12 @@ static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
     return 1;
 }
 
-static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
+static void gayle_a1200_clear_irq(ide_drive_t *drive)
 {
-    unsigned char ch;
+    ide_hwif_t *hwif = drive->hwif;
 
-    ch = z_readb(hwif->io_ports.irq_addr);
-    if (!(ch & GAYLE_IRQ_IDE))
-        return 0;
     (void)z_readb(hwif->io_ports.status_addr);
     z_writeb(0x7c, hwif->io_ports.irq_addr);
-    return 1;
 }
 
 static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base,
@@ -108,6 +104,10 @@ static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base,
         hw->ack_intr = ack_intr;
 }
 
+static const struct ide_port_ops gayle_a1200_port_ops = {
+        .clear_irq              = gayle_a1200_clear_irq,
+};
+
 static const struct ide_port_info gayle_port_info = {
         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
                                   IDE_HFLAG_NO_DMA,
@@ -123,9 +123,9 @@ static int __init gayle_init(void)
 {
     unsigned long phys_base, res_start, res_n;
     unsigned long base, ctrlport, irqport;
-    ide_ack_intr_t *ack_intr;
     int a4000, i, rc;
     struct ide_hw hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS];
+    struct ide_port_info d = gayle_port_info;
 
     if (!MACH_IS_AMIGA)
         return -ENODEV;
@@ -148,11 +148,10 @@ found:
         if (a4000) {
             phys_base = GAYLE_BASE_4000;
             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
-            ack_intr = gayle_ack_intr_a4000;
         } else {
             phys_base = GAYLE_BASE_1200;
             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
-            ack_intr = gayle_ack_intr_a1200;
+            d.port_ops = &gayle_a1200_port_ops;
         }
 
         res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
@@ -165,12 +164,12 @@ found:
         base = (unsigned long)ZTWO_VADDR(phys_base + i * GAYLE_NEXT_PORT);
         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 
-        gayle_setup_ports(&hw[i], base, ctrlport, irqport, ack_intr);
+        gayle_setup_ports(&hw[i], base, ctrlport, irqport, gayle_ack_intr);
 
         hws[i] = &hw[i];
     }
 
-    rc = ide_host_add(&gayle_port_info, hws, i, NULL);
+    rc = ide_host_add(&d, hws, i, NULL);
     if (rc)
         release_mem_region(res_start, res_n);
 
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index c569d56eadc6..9e53efe9fb2d 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -683,8 +683,6 @@ void ide_timer_expiry (unsigned long data)
                 } else if (drive_is_ready(drive)) {
                         if (drive->waiting_for_dma)
                                 hwif->dma_ops->dma_lost_irq(drive);
-                        if (hwif->ack_intr)
-                                hwif->ack_intr(hwif);
                         if (hwif->port_ops && hwif->port_ops->clear_irq)
                                 hwif->port_ops->clear_irq(drive);
 
diff --git a/drivers/ide/macide.c b/drivers/ide/macide.c
index 1447c8c90565..05cdab35a75c 100644
--- a/drivers/ide/macide.c
+++ b/drivers/ide/macide.c
@@ -55,13 +55,16 @@ volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
 
 int macide_ack_intr(ide_hwif_t* hwif)
 {
-        if (*ide_ifr & 0x20) {
-                *ide_ifr &= ~0x20;
+        if (*ide_ifr & 0x20)
                 return 1;
-        }
         return 0;
 }
 
+static void macide_clear_irq(ide_drive_t *drive)
+{
+        *ide_ifr &= ~0x20;
+}
+
 static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
                                       int irq, ide_ack_intr_t *ack_intr)
 {
@@ -78,7 +81,12 @@ static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
         hw->ack_intr = ack_intr;
 }
 
+static const struct ide_port_ops macide_port_ops = {
+        .clear_irq              = macide_clear_irq,
+};
+
 static const struct ide_port_info macide_port_info = {
+        .port_ops               = &macide_port_ops,
         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
         .irq_flags              = IRQF_SHARED,
         .chipset                = ide_generic,
@@ -97,6 +105,7 @@ static int __init macide_init(void)
         unsigned long base;
         int irq;
         struct ide_hw hw, *hws[] = { &hw };
+        struct ide_port_info d = macide_port_info;
 
         if (!MACH_IS_MAC)
                 return -ENODEV;
@@ -115,6 +124,7 @@ static int __init macide_init(void)
         case MAC_IDE_BABOON:
                 base = BABOON_BASE;
                 ack_intr = NULL;
+                d.port_ops = NULL;
                 irq = IRQ_BABOON_1;
                 break;
         default:
@@ -126,7 +136,7 @@ static int __init macide_init(void)
 
         macide_setup_ports(&hw, base, irq, ack_intr);
 
-        return ide_host_add(&macide_port_info, hws, 1, NULL);
+        return ide_host_add(&d, hws, 1, NULL);
 }
 
 module_init(macide_init);