diff options
| -rw-r--r-- | drivers/scsi/mac_esp.c | 81 |
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; } } |