diff options
| -rw-r--r-- | drivers/scsi/g_NCR5380.c | 70 |
1 files changed, 57 insertions, 13 deletions
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index 6d245a7b9363..58a0b826eb51 100644 --- a/drivers/scsi/g_NCR5380.c +++ b/drivers/scsi/g_NCR5380.c @@ -131,14 +131,33 @@ static void magic_configure(int idx, u8 irq, u8 magic[]) outb(magic[3], 0x379); outb(magic[4], 0x379); - /* allowed IRQs for HP C2502 */ - if (irq != 2 && irq != 3 && irq != 4 && irq != 5 && irq != 7) - irq = 0; + if (irq == 9) + irq = 2; + if (idx >= 0 && idx <= 7) cfg = 0x80 | idx | (irq << 4); outb(cfg, 0x379); } +static irqreturn_t legacy_empty_irq_handler(int irq, void *dev_id) +{ + return IRQ_HANDLED; +} + +static int legacy_find_free_irq(int *irq_table) +{ + while (*irq_table != -1) { + if (!request_irq(*irq_table, legacy_empty_irq_handler, + IRQF_PROBE_SHARED, "Test IRQ", + (void *)irq_table)) { + free_irq(*irq_table, (void *) irq_table); + return *irq_table; + } + irq_table++; + } + return -1; +} + static unsigned int ncr_53c400a_ports[] = { 0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0 }; @@ -151,6 +170,9 @@ static u8 ncr_53c400a_magic[] = { /* 53C400A & DTC436 */ static u8 hp_c2502_magic[] = { /* HP C2502 */ 0x0f, 0x22, 0xf0, 0x20, 0x80 }; +static int hp_c2502_irqs[] = { + 9, 5, 7, 3, 4, -1 +}; static int generic_NCR5380_init_one(struct scsi_host_template *tpnt, struct device *pdev, int base, int irq, int board) @@ -319,19 +341,41 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt, NCR5380_maybe_reset_bus(instance); - if (irq != IRQ_AUTO) - instance->irq = irq; - else - instance->irq = g_NCR5380_probe_irq(instance); - /* Compatibility with documented NCR5380 kernel parameters */ - if (instance->irq == 255) - instance->irq = NO_IRQ; + if (irq == 255 || irq == 0) + irq = NO_IRQ; + + if (board == BOARD_HP_C2502) { + int *irq_table = hp_c2502_irqs; + int board_irq = -1; + + switch (irq) { + case NO_IRQ: + board_irq = 0; + break; + case IRQ_AUTO: + board_irq = legacy_find_free_irq(irq_table); + break; + default: + while (*irq_table != -1) + if (*irq_table++ == irq) + board_irq = irq; + } + + if (board_irq <= 0) { + board_irq = 0; + irq = NO_IRQ; + } + + magic_configure(port_idx, board_irq, magic); + } + + if (irq == IRQ_AUTO) + instance->irq = g_NCR5380_probe_irq(instance); + else + instance->irq = irq; if (instance->irq != NO_IRQ) { - /* set IRQ for HP C2502 */ - if (board == BOARD_HP_C2502) - magic_configure(port_idx, instance->irq, magic); if (request_irq(instance->irq, generic_NCR5380_intr, 0, "NCR5380", instance)) { printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq); |