[PATCH v2 73/71] ncr5380: Use runtime register mapping
From: Ondrej Zary
Date: Sun Dec 06 2015 - 17:20:54 EST
Convert compile-time C400_ register mapping to runtime mapping.
This removes the weird negative register offsets and allows adding
additional mappings.
While at it, convert read/write loops into insb/outsb.
Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/NCR5380.h | 13 +------
drivers/scsi/g_NCR5380.c | 88 +++++++++++++++++++++-------------------------
drivers/scsi/g_NCR5380.h | 12 ++++---
3 files changed, 49 insertions(+), 64 deletions(-)
diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h
index 36779df..923db6c 100644
--- a/drivers/scsi/NCR5380.h
+++ b/drivers/scsi/NCR5380.h
@@ -163,8 +163,7 @@
/* Write any value to this register to start an ini mode DMA receive */
#define START_DMA_INITIATOR_RECEIVE_REG 7 /* wo */
-#define C400_CONTROL_STATUS_REG NCR53C400_register_offset-8 /* rw */
-
+/* NCR 53C400(A) Control Status Register bits: */
#define CSR_RESET 0x80 /* wo Resets 53c400 */
#define CSR_53C80_REG 0x80 /* ro 5380 registers busy */
#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
@@ -181,16 +180,6 @@
#define CSR_BASE CSR_53C80_INTR
#endif
-/* Number of 128-byte blocks to be transferred */
-#define C400_BLOCK_COUNTER_REG NCR53C400_register_offset-7 /* rw */
-
-/* Resume transfer after disconnect */
-#define C400_RESUME_TRANSFER_REG NCR53C400_register_offset-6 /* wo */
-
-/* Access to host buffer stack */
-#define C400_HOST_BUFFER NCR53C400_register_offset-4 /* rw */
-
-
/* Note : PHASE_* macros are based on the values of the STATUS register */
#define PHASE_MASK (SR_MSG | SR_CD | SR_IO)
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index a9a237f..86740fd 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -253,6 +253,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
};
int flags;
struct Scsi_Host *instance;
+ struct NCR5380_hostdata *hostdata;
#ifdef SCSI_G_NCR5380_MEM
unsigned long base;
void __iomem *iomem;
@@ -395,6 +396,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
if (instance == NULL)
goto out_release;
+ hostdata = shost_priv(instance);
#ifndef SCSI_G_NCR5380_MEM
instance->io_port = overrides[current_override].NCR5380_map_name;
@@ -404,18 +406,27 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
* On NCR53C400 boards, NCR5380 registers are mapped 8 past
* the base address.
*/
- if (overrides[current_override].board == BOARD_NCR53C400)
+ if (overrides[current_override].board == BOARD_NCR53C400) {
instance->io_port += 8;
+ hostdata->c400_ctl_status = 0;
+ hostdata->c400_blk_cnt = 1;
+ hostdata->c400_host_buf = 4;
+ }
#else
instance->base = overrides[current_override].NCR5380_map_name;
- ((struct NCR5380_hostdata *)instance->hostdata)->iomem = iomem;
+ hostdata->iomem = iomem;
+ if (overrides[current_override].board == BOARD_NCR53C400) {
+ hostdata->c400_ctl_status = 0x100;
+ hostdata->c400_blk_cnt = 0x101;
+ hostdata->c400_host_buf = 0x104;
+ }
#endif
if (NCR5380_init(instance, flags))
goto out_unregister;
if (overrides[current_override].board == BOARD_NCR53C400)
- NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
+ NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
NCR5380_maybe_reset_bus(instance);
@@ -523,31 +534,25 @@ generic_NCR5380_biosparam(struct scsi_device *sdev, struct block_device *bdev,
static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
{
-#ifdef SCSI_G_NCR5380_MEM
struct NCR5380_hostdata *hostdata = shost_priv(instance);
-#endif
int blocks = len / 128;
int start = 0;
- int bl;
- NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE | CSR_TRANS_DIR);
- NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
+ NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
+ NCR5380_write(hostdata->c400_blk_cnt, blocks);
while (1) {
- if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
+ if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
break;
- }
- if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
+ if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
return -1;
}
- while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY);
+ while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
+ ; /* FIXME - no timeout */
#ifndef SCSI_G_NCR5380_MEM
- {
- int i;
- for (i = 0; i < 128; i++)
- dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
- }
+ insb(instance->io_port + hostdata->c400_host_buf,
+ dst + start, 128);
#else
/* implies SCSI_G_NCR5380_MEM */
memcpy_fromio(dst + start,
@@ -558,17 +563,12 @@ static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst,
}
if (blocks) {
- while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
- {
- // FIXME - no timeout
- }
+ while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
+ ; /* FIXME - no timeout */
#ifndef SCSI_G_NCR5380_MEM
- {
- int i;
- for (i = 0; i < 128; i++)
- dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
- }
+ insb(instance->io_port + hostdata->c400_host_buf,
+ dst + start, 128);
#else
/* implies SCSI_G_NCR5380_MEM */
memcpy_fromio(dst + start,
@@ -578,7 +578,7 @@ static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst,
blocks--;
}
- if (!(NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
+ if (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ))
printk("53C400r: no 53C80 gated irq after transfer");
#if 0
@@ -586,7 +586,7 @@ static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst,
* DON'T DO THIS - THEY NEVER ARRIVE!
*/
printk("53C400r: Waiting for 53C80 registers\n");
- while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG)
+ while (NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)
;
#endif
if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
@@ -607,32 +607,26 @@ static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst,
static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
{
-#ifdef SCSI_G_NCR5380_MEM
struct NCR5380_hostdata *hostdata = shost_priv(instance);
-#endif
int blocks = len / 128;
int start = 0;
- int bl;
int i;
- NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
- NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
+ NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
+ NCR5380_write(hostdata->c400_blk_cnt, blocks);
while (1) {
- if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
+ if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
return -1;
}
- if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
+ if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
break;
- }
- while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
+ while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
; // FIXME - timeout
#ifndef SCSI_G_NCR5380_MEM
- {
- for (i = 0; i < 128; i++)
- NCR5380_write(C400_HOST_BUFFER, src[start + i]);
- }
+ outsb(instance->io_port + hostdata->c400_host_buf,
+ src + start, 128);
#else
/* implies SCSI_G_NCR5380_MEM */
memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
@@ -642,14 +636,12 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src,
blocks--;
}
if (blocks) {
- while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
+ while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
; // FIXME - no timeout
#ifndef SCSI_G_NCR5380_MEM
- {
- for (i = 0; i < 128; i++)
- NCR5380_write(C400_HOST_BUFFER, src[start + i]);
- }
+ outsb(instance->io_port + hostdata->c400_host_buf,
+ src + start, 128);
#else
/* implies SCSI_G_NCR5380_MEM */
memcpy_toio(hostdata->iomem + NCR53C400_host_buffer,
@@ -661,7 +653,7 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src,
#if 0
printk("53C400w: waiting for registers to be available\n");
- THEY NEVER DO ! while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG);
+ THEY NEVER DO ! while (NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG);
printk("53C400w: Got em\n");
#endif
@@ -669,7 +661,7 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src,
/* All documentation says to check for this. Maybe my hardware is too
* fast. Waiting for it seems to work fine! KLL
*/
- while (!(i = NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
+ while (!(i = NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ))
; // FIXME - no timeout
/*
diff --git a/drivers/scsi/g_NCR5380.h b/drivers/scsi/g_NCR5380.h
index fd201e9..c5e57b7 100644
--- a/drivers/scsi/g_NCR5380.h
+++ b/drivers/scsi/g_NCR5380.h
@@ -29,7 +29,6 @@
#define NCR5380_map_type int
#define NCR5380_map_name port
-#define NCR53C400_register_offset 0
#ifdef CONFIG_SCSI_GENERIC_NCR53C400
#define NCR5380_region_size 16
@@ -42,7 +41,10 @@
#define NCR5380_write(reg, value) \
outb(value, instance->io_port + (reg))
-#define NCR5380_implementation_fields /* none */
+#define NCR5380_implementation_fields \
+ int c400_ctl_status; \
+ int c400_blk_cnt; \
+ int c400_host_buf;
#else
/* therefore SCSI_G_NCR5380_MEM */
@@ -50,7 +52,6 @@
#define NCR5380_map_type unsigned long
#define NCR5380_map_name base
-#define NCR53C400_register_offset 0x108
#define NCR53C400_mem_base 0x3880
#define NCR53C400_host_buffer 0x3900
#define NCR5380_region_size 0x3a00
@@ -63,7 +64,10 @@
NCR53C400_mem_base + (reg))
#define NCR5380_implementation_fields \
- void __iomem *iomem;
+ void __iomem *iomem; \
+ int c400_ctl_status; \
+ int c400_blk_cnt; \
+ int c400_host_buf;
#endif
--
Ondrej Zary
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/