[PATCH v3 78/71] ncr5380: Add support for HP 53C400A-based cards (C2502)

From: Ondrej Zary
Date: Wed Dec 09 2015 - 07:12:00 EST

HP C2502 cards (based on 53C400A chips) use different magic numbers for
software-based I/O address configuration than other cards.
The configuration is also extended to allow setting the IRQ.

Move the configuration to a new function magic_configure() and move
magic the magic numbers into an array. Add new magic numbers for these
HP cards and hp_c2502 module parameter to use them, e.g.:
modprobe g_NCR5380 ncr_irq=7 ncr_addr=0x280 ncr_53c400a=1 hp_c2502=1

Tested with HP C2502 and DTCT-436P.

Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/g_NCR5380.c | 74 ++++++++++++++++++++++++++++++++++++----------
1 file changed, 58 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index 42fdeaf..dd32c68 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -80,12 +80,14 @@ static int ncr_5380;
static int ncr_53c400;
static int ncr_53c400a;
static int dtc_3181e;
+static int hp_c2502;

static struct override {
NCR5380_map_type NCR5380_map_name;
int irq;
int dma;
int board; /* Use NCR53c400, Ricoh, etc. extensions ? */
+ bool hp_c2502;
} overrides
#ifdef GENERIC_NCR5380_OVERRIDE
[] __initdata = GENERIC_NCR5380_OVERRIDE;
@@ -225,6 +227,32 @@ static int __init do_DTC3181E_setup(char *str)

#endif

+#ifndef SCSI_G_NCR5380_MEM
+/*
+ * Configure I/O address of 53C400A or DTC436 by writing magic numbers
+ * to ports 0x779 and 0x379. Two magic number sequences are known:
+ * 1. for generic NCR 53C400A-based cards and DTC436 chips
+ * 2. for HP C2502 card (also based on 53C400A but different decode logic)
+ */
+static void magic_configure(int idx, u8 irq, u8 magic[])
+{
+ u8 cfg = 0;
+
+ outb(magic[0], 0x779);
+ outb(magic[1], 0x379);
+ outb(magic[2], 0x379);
+ outb(magic[3], 0x379);
+ outb(magic[4], 0x379);
+
+ /* allowed IRQs for HP 53C400A */
+ if (irq != 2 && irq != 3 && irq != 4 && irq != 5 && irq != 7)
+ irq = 0;
+ if (idx >= 0 && idx <= 7)
+ cfg = 0x80 | idx | (irq << 4);
+ outb(cfg, 0x379);
+}
+#endif
+
/**
* generic_NCR5380_detect - look for NCR5380 controllers
* @tpnt: the scsi template
@@ -241,8 +269,9 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
static int current_override;
int count;
unsigned int *ports;
+ u8 *magic;
#ifndef SCSI_G_NCR5380_MEM
- int i;
+ int i, port_idx;
unsigned long region_size = 16;
#endif
static unsigned int __initdata ncr_53c400a_ports[] = {
@@ -251,6 +280,12 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
static unsigned int __initdata dtc_3181e_ports[] = {
0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
};
+ static u8 ncr_53c400a_magic[] __initdata = { /* 53C400A & DTC436 */
+ 0x59, 0xb9, 0xc5, 0xae, 0xa6
+ };
+ static u8 hp_c2502_magic[] __initdata = { /* HP C2502 */
+ 0x0f, 0x22, 0xf0, 0x20, 0x80
+ };
int flags;
struct Scsi_Host *instance;
struct NCR5380_hostdata *hostdata;
@@ -273,6 +308,8 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
overrides[0].board = BOARD_NCR53C400A;
else if (dtc_3181e)
overrides[0].board = BOARD_DTC3181E;
+ if (hp_c2502)
+ overrides[0].hp_c2502 = true;
#ifndef SCSI_G_NCR5380_MEM
if (!current_override && isapnp_present()) {
struct pnp_dev *dev = NULL;
@@ -326,24 +363,25 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
case BOARD_NCR53C400A:
flags = FLAG_NO_DMA_FIXUP;
ports = ncr_53c400a_ports;
+ magic = ncr_53c400a_magic;
break;
case BOARD_DTC3181E:
flags = FLAG_NO_DMA_FIXUP;
ports = dtc_3181e_ports;
+ magic = ncr_53c400a_magic;
break;
}
+ if (overrides[current_override].hp_c2502)
+ magic = hp_c2502_magic;
+ else
+ magic = ncr_53c400a_magic;

#ifndef SCSI_G_NCR5380_MEM
if (ports) {
/* wakeup sequence for the NCR53C400A and DTC3181E */

/* Disable the adapter and look for a free io port */
- outb(0x59, 0x779);
- outb(0xb9, 0x379);
- outb(0xc5, 0x379);
- outb(0xae, 0x379);
- outb(0xa6, 0x379);
- outb(0x00, 0x379);
+ magic_configure(-1, 0, magic);

if (overrides[current_override].NCR5380_map_name != PORT_AUTO)
for (i = 0; ports[i]; i++) {
@@ -362,17 +400,14 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
}
if (ports[i]) {
/* At this point we have our region reserved */
- outb(0x59, 0x779);
- outb(0xb9, 0x379);
- outb(0xc5, 0x379);
- outb(0xae, 0x379);
- outb(0xa6, 0x379);
- outb(0x80 | i, 0x379); /* set io port to be used */
+ magic_configure(i, 0, magic); /* no IRQ yet */
outb(0xc0, ports[i] + 9);
- if (inb(ports[i] + 9) != 0x80)
+ if (inb(ports[i] + 9) != 0x80) {
continue;
- else
+ } else {
overrides[current_override].NCR5380_map_name = ports[i];
+ port_idx = i;
+ }
} else
continue;
}
@@ -452,12 +487,18 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
if (instance->irq == 255)
instance->irq = NO_IRQ;

- if (instance->irq != NO_IRQ)
+ if (instance->irq != NO_IRQ) {
+#ifndef SCSI_G_NCR5380_MEM
+ /* set IRQ for HP C2502 */
+ if (magic == hp_c2502_magic)
+ magic_configure(port_idx, instance->irq, magic);
+#endif
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);
instance->irq = NO_IRQ;
}
+ }

if (instance->irq == NO_IRQ) {
printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
@@ -743,6 +784,7 @@ module_param(ncr_5380, int, 0);
module_param(ncr_53c400, int, 0);
module_param(ncr_53c400a, int, 0);
module_param(dtc_3181e, int, 0);
+module_param(hp_c2502, int, 0);
MODULE_LICENSE("GPL");

#if !defined(SCSI_G_NCR5380_MEM) && defined(MODULE)
--
Ondrej Zary

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