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-rw-r--r--drivers/scsi/mac_esp.c81
1 files changed, 58 insertions, 23 deletions
diff --git a/drivers/scsi/mac_esp.c b/drivers/scsi/mac_esp.c
index a99f9ce6be5..c24e86f0780 100644
--- a/drivers/scsi/mac_esp.c
+++ b/drivers/scsi/mac_esp.c
@@ -53,7 +53,8 @@ struct mac_esp_priv {
void __iomem *pdma_io;
int error;
};
-static struct platform_device *internal_esp, *external_esp;
+static struct platform_device *internal_pdev, *external_pdev;
+static struct esp *esp_chips[2];
#define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \
platform_get_drvdata((struct platform_device *) \
@@ -443,6 +444,32 @@ static u32 mac_esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
return dma_len > 0xFFFF ? 0xFFFF : dma_len;
}
+static irqreturn_t mac_scsi_esp_intr(int irq, void *dev_id)
+{
+ int got_intr;
+
+ /*
+ * This is an edge triggered IRQ, so we have to be careful to
+ * avoid missing a transition when it is shared by two ESP devices.
+ */
+
+ do {
+ got_intr = 0;
+ if (esp_chips[0] &&
+ (mac_esp_read8(esp_chips[0], ESP_STATUS) & ESP_STAT_INTR)) {
+ (void)scsi_esp_intr(irq, esp_chips[0]);
+ got_intr = 1;
+ }
+ if (esp_chips[1] &&
+ (mac_esp_read8(esp_chips[1], ESP_STATUS) & ESP_STAT_INTR)) {
+ (void)scsi_esp_intr(irq, esp_chips[1]);
+ got_intr = 1;
+ }
+ } while (got_intr);
+
+ return IRQ_HANDLED;
+}
+
static struct esp_driver_ops mac_esp_ops = {
.esp_write8 = mac_esp_write8,
.esp_read8 = mac_esp_read8,
@@ -557,10 +584,16 @@ static int __devinit esp_mac_probe(struct platform_device *dev)
}
host->irq = IRQ_MAC_SCSI;
- err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "Mac ESP",
- esp);
- if (err < 0)
- goto fail_free_priv;
+ esp_chips[dev->id] = esp;
+ mb();
+ if (esp_chips[!dev->id] == NULL) {
+ err = request_irq(host->irq, mac_scsi_esp_intr, 0,
+ "Mac ESP", NULL);
+ if (err < 0) {
+ esp_chips[dev->id] = NULL;
+ goto fail_free_priv;
+ }
+ }
err = scsi_esp_register(esp, &dev->dev);
if (err)
@@ -569,7 +602,8 @@ static int __devinit esp_mac_probe(struct platform_device *dev)
return 0;
fail_free_irq:
- free_irq(host->irq, esp);
+ if (esp_chips[!dev->id] == NULL)
+ free_irq(host->irq, esp);
fail_free_priv:
kfree(mep);
fail_free_command_block:
@@ -588,7 +622,9 @@ static int __devexit esp_mac_remove(struct platform_device *dev)
scsi_esp_unregister(esp);
- free_irq(irq, esp);
+ esp_chips[dev->id] = NULL;
+ if (!(esp_chips[0] || esp_chips[1]))
+ free_irq(irq, NULL);
kfree(mep);
@@ -615,19 +651,18 @@ static int __init mac_esp_init(void)
if (err)
return err;
- internal_esp = platform_device_alloc(DRV_MODULE_NAME, 0);
- if (internal_esp && platform_device_add(internal_esp)) {
- platform_device_put(internal_esp);
- internal_esp = NULL;
+ internal_pdev = platform_device_alloc(DRV_MODULE_NAME, 0);
+ if (internal_pdev && platform_device_add(internal_pdev)) {
+ platform_device_put(internal_pdev);
+ internal_pdev = NULL;
}
-
- external_esp = platform_device_alloc(DRV_MODULE_NAME, 1);
- if (external_esp && platform_device_add(external_esp)) {
- platform_device_put(external_esp);
- external_esp = NULL;
+ external_pdev = platform_device_alloc(DRV_MODULE_NAME, 1);
+ if (external_pdev && platform_device_add(external_pdev)) {
+ platform_device_put(external_pdev);
+ external_pdev = NULL;
}
- if (internal_esp || external_esp) {
+ if (internal_pdev || external_pdev) {
return 0;
} else {
platform_driver_unregister(&esp_mac_driver);
@@ -639,13 +674,13 @@ static void __exit mac_esp_exit(void)
{
platform_driver_unregister(&esp_mac_driver);
- if (internal_esp) {
- platform_device_unregister(internal_esp);
- internal_esp = NULL;
+ if (internal_pdev) {
+ platform_device_unregister(internal_pdev);
+ internal_pdev = NULL;
}
- if (external_esp) {
- platform_device_unregister(external_esp);
- external_esp = NULL;
+ if (external_pdev) {
+ platform_device_unregister(external_pdev);
+ external_pdev = NULL;
}
}