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Diffstat (limited to 'drivers/scsi/g_NCR5380.c')
-rw-r--r--drivers/scsi/g_NCR5380.c300
1 files changed, 167 insertions, 133 deletions
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index c34fc91ba486..270eae7ac427 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -1,17 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic Generic NCR5380 driver
- *
+ *
* Copyright 1993, Drew Eckhardt
- * Visionary Computing
- * (Unix and Linux consulting and custom programming)
- * drew@colorado.edu
- * +1 (303) 440-4894
+ * Visionary Computing
+ * (Unix and Linux consulting and custom programming)
+ * drew@colorado.edu
+ * +1 (303) 440-4894
*
* NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
- * K.Lentin@cs.monash.edu.au
+ * K.Lentin@cs.monash.edu.au
*
* NCR53C400A extensions (c) 1996, Ingmar Baumgart
- * ingmar@gonzo.schwaben.de
+ * ingmar@gonzo.schwaben.de
*
* DTC3181E extensions (c) 1997, Ronald van Cuijlenborg
* ronald.van.cuijlenborg@tip.nl or nutty@dds.nl
@@ -19,7 +20,7 @@
* Added ISAPNP support for DTC436 adapters,
* Thomas Sailer, sailer@ife.ee.ethz.ch
*
- * See Documentation/scsi/g_NCR5380.txt for more info.
+ * See Documentation/scsi/g_NCR5380.rst for more info.
*/
#include <asm/io.h>
@@ -44,17 +45,19 @@
int c400_ctl_status; \
int c400_blk_cnt; \
int c400_host_buf; \
- int io_width
+ int io_width; \
+ int pdma_residual; \
+ int board
#define NCR5380_dma_xfer_len generic_NCR5380_dma_xfer_len
-#define NCR5380_dma_recv_setup generic_NCR5380_pread
-#define NCR5380_dma_send_setup generic_NCR5380_pwrite
-#define NCR5380_dma_residual NCR5380_dma_residual_none
+#define NCR5380_dma_recv_setup generic_NCR5380_precv
+#define NCR5380_dma_send_setup generic_NCR5380_psend
+#define NCR5380_dma_residual generic_NCR5380_dma_residual
#define NCR5380_intr generic_NCR5380_intr
#define NCR5380_queue_command generic_NCR5380_queue_command
#define NCR5380_abort generic_NCR5380_abort
-#define NCR5380_bus_reset generic_NCR5380_bus_reset
+#define NCR5380_host_reset generic_NCR5380_host_reset
#define NCR5380_info generic_NCR5380_info
#define NCR5380_io_delay(x) udelay(x)
@@ -76,6 +79,7 @@
#define IRQ_AUTO 254
#define MAX_CARDS 8
+#define DMA_MAX_SIZE 32768
/* old-style parameters for compatibility */
static int ncr_irq = -1;
@@ -106,6 +110,7 @@ module_param_array(card, int, NULL, 0);
MODULE_PARM_DESC(card, "card type (0=NCR5380, 1=NCR53C400, 2=NCR53C400A, 3=DTC3181E, 4=HP C2502)");
MODULE_ALIAS("g_NCR5380_mmio");
+MODULE_DESCRIPTION("Generic NCR5380/NCR53C400 SCSI driver");
MODULE_LICENSE("GPL");
static void g_NCR5380_trigger_irq(struct Scsi_Host *instance)
@@ -215,7 +220,7 @@ static int hp_c2502_irqs[] = {
9, 5, 7, 3, 4, -1
};
-static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
+static int generic_NCR5380_init_one(const struct scsi_host_template *tpnt,
struct device *pdev, int base, int irq, int board)
{
bool is_pmio = base <= 0xffff;
@@ -314,6 +319,7 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
}
hostdata = shost_priv(instance);
+ hostdata->board = board;
hostdata->io = iomem;
hostdata->region_size = region_size;
@@ -335,7 +341,7 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
break;
case BOARD_DTC3181E:
hostdata->io_width = 2; /* 16-bit PDMA */
- /* fall through */
+ fallthrough;
case BOARD_NCR53C400A:
case BOARD_HP_C2502:
hostdata->c400_ctl_status = 9;
@@ -478,204 +484,233 @@ static void generic_NCR5380_release_resources(struct Scsi_Host *instance)
release_mem_region(base, region_size);
}
+/* wait_for_53c80_access - wait for 53C80 registers to become accessible
+ * @hostdata: scsi host private data
+ *
+ * The registers within the 53C80 logic block are inaccessible until
+ * bit 7 in the 53C400 control status register gets asserted.
+ */
+
+static void wait_for_53c80_access(struct NCR5380_hostdata *hostdata)
+{
+ int count = 10000;
+
+ do {
+ if (hostdata->board == BOARD_DTC3181E)
+ udelay(4); /* DTC436 chip hangs without this */
+ if (NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)
+ return;
+ } while (--count > 0);
+
+ scmd_printk(KERN_ERR, hostdata->connected,
+ "53c80 registers not accessible, device will be reset\n");
+ NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
+ NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
+}
+
/**
- * generic_NCR5380_pread - pseudo DMA read
- * @hostdata: scsi host private data
- * @dst: buffer to read into
- * @len: buffer length
+ * generic_NCR5380_precv - pseudo DMA receive
+ * @hostdata: scsi host private data
+ * @dst: buffer to write into
+ * @len: transfer size
*
- * Perform a pseudo DMA mode read from an NCR53C400 or equivalent
- * controller
+ * Perform a pseudo DMA mode receive from a 53C400 or equivalent device.
*/
-
-static inline int generic_NCR5380_pread(struct NCR5380_hostdata *hostdata,
+
+static inline int generic_NCR5380_precv(struct NCR5380_hostdata *hostdata,
unsigned char *dst, int len)
{
- int blocks = len / 128;
+ int residual;
int start = 0;
NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
- NCR5380_write(hostdata->c400_blk_cnt, blocks);
- while (1) {
- if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
- break;
- 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;
+ NCR5380_write(hostdata->c400_blk_cnt, len / 128);
+
+ do {
+ if (start == len - 128) {
+ /* Ignore End of DMA interrupt for the final buffer */
+ if (NCR5380_poll_politely(hostdata, hostdata->c400_ctl_status,
+ CSR_HOST_BUF_NOT_RDY, 0, 0) < 0)
+ break;
+ } else {
+ if (NCR5380_poll_politely2(hostdata, hostdata->c400_ctl_status,
+ CSR_HOST_BUF_NOT_RDY, 0,
+ hostdata->c400_ctl_status,
+ CSR_GATED_53C80_IRQ,
+ CSR_GATED_53C80_IRQ, 0) < 0 ||
+ NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
+ break;
}
- while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
- ; /* FIXME - no timeout */
if (hostdata->io_port && hostdata->io_width == 2)
insw(hostdata->io_port + hostdata->c400_host_buf,
- dst + start, 64);
+ dst + start, 64);
else if (hostdata->io_port)
insb(hostdata->io_port + hostdata->c400_host_buf,
- dst + start, 128);
+ dst + start, 128);
else
memcpy_fromio(dst + start,
hostdata->io + NCR53C400_host_buffer, 128);
-
start += 128;
- blocks--;
- }
+ } while (start < len);
- if (blocks) {
- while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
- ; /* FIXME - no timeout */
+ residual = len - start;
- if (hostdata->io_port && hostdata->io_width == 2)
- insw(hostdata->io_port + hostdata->c400_host_buf,
- dst + start, 64);
- else if (hostdata->io_port)
- insb(hostdata->io_port + hostdata->c400_host_buf,
- dst + start, 128);
- else
- memcpy_fromio(dst + start,
- hostdata->io + NCR53C400_host_buffer, 128);
-
- start += 128;
- blocks--;
+ if (residual != 0) {
+ /* 53c80 interrupt or transfer timeout. Reset 53c400 logic. */
+ NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
+ NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
}
+ wait_for_53c80_access(hostdata);
- if (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ))
- printk("53C400r: no 53C80 gated irq after transfer");
+ if (residual == 0 && NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
+ BASR_END_DMA_TRANSFER,
+ BASR_END_DMA_TRANSFER,
+ 0) < 0)
+ scmd_printk(KERN_ERR, hostdata->connected, "%s: End of DMA timeout\n",
+ __func__);
- /* wait for 53C80 registers to be available */
- while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG))
- ;
+ hostdata->pdma_residual = residual;
- if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
- printk(KERN_ERR "53C400r: no end dma signal\n");
-
return 0;
}
/**
- * generic_NCR5380_pwrite - pseudo DMA write
- * @hostdata: scsi host private data
- * @dst: buffer to read into
- * @len: buffer length
+ * generic_NCR5380_psend - pseudo DMA send
+ * @hostdata: scsi host private data
+ * @src: buffer to read from
+ * @len: transfer size
*
- * Perform a pseudo DMA mode read from an NCR53C400 or equivalent
- * controller
+ * Perform a pseudo DMA mode send to a 53C400 or equivalent device.
*/
-static inline int generic_NCR5380_pwrite(struct NCR5380_hostdata *hostdata,
- unsigned char *src, int len)
+static inline int generic_NCR5380_psend(struct NCR5380_hostdata *hostdata,
+ unsigned char *src, int len)
{
- int blocks = len / 128;
+ int residual;
int start = 0;
NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
- NCR5380_write(hostdata->c400_blk_cnt, blocks);
- while (1) {
- 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;
+ NCR5380_write(hostdata->c400_blk_cnt, len / 128);
+
+ do {
+ if (NCR5380_poll_politely2(hostdata, hostdata->c400_ctl_status,
+ CSR_HOST_BUF_NOT_RDY, 0,
+ hostdata->c400_ctl_status,
+ CSR_GATED_53C80_IRQ,
+ CSR_GATED_53C80_IRQ, 0) < 0 ||
+ NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY) {
+ /* Both 128 B buffers are in use */
+ if (start >= 128)
+ start -= 128;
+ if (start >= 128)
+ start -= 128;
+ break;
}
- if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
+ if (start >= len && NCR5380_read(hostdata->c400_blk_cnt) == 0)
break;
- while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
- ; // FIXME - timeout
- if (hostdata->io_port && hostdata->io_width == 2)
- outsw(hostdata->io_port + hostdata->c400_host_buf,
- src + start, 64);
- else if (hostdata->io_port)
- outsb(hostdata->io_port + hostdata->c400_host_buf,
- src + start, 128);
- else
- memcpy_toio(hostdata->io + NCR53C400_host_buffer,
- src + start, 128);
+ if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
+ /* Host buffer is empty, other one is in use */
+ if (start >= 128)
+ start -= 128;
+ break;
+ }
- start += 128;
- blocks--;
- }
- if (blocks) {
- while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
- ; // FIXME - no timeout
+ if (start >= len)
+ continue;
if (hostdata->io_port && hostdata->io_width == 2)
outsw(hostdata->io_port + hostdata->c400_host_buf,
- src + start, 64);
+ src + start, 64);
else if (hostdata->io_port)
outsb(hostdata->io_port + hostdata->c400_host_buf,
- src + start, 128);
+ src + start, 128);
else
memcpy_toio(hostdata->io + NCR53C400_host_buffer,
src + start, 128);
-
start += 128;
- blocks--;
- }
+ } while (1);
- /* wait for 53C80 registers to be available */
- while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)) {
- udelay(4); /* DTC436 chip hangs without this */
- /* FIXME - no timeout */
- }
+ residual = len - start;
- if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
- printk(KERN_ERR "53C400w: no end dma signal\n");
+ if (residual != 0) {
+ /* 53c80 interrupt or transfer timeout. Reset 53c400 logic. */
+ NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
+ NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
}
+ wait_for_53c80_access(hostdata);
+
+ if (residual == 0) {
+ if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
+ TCR_LAST_BYTE_SENT, TCR_LAST_BYTE_SENT,
+ 0) < 0)
+ scmd_printk(KERN_ERR, hostdata->connected,
+ "%s: Last Byte Sent timeout\n", __func__);
+
+ if (NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
+ BASR_END_DMA_TRANSFER, BASR_END_DMA_TRANSFER,
+ 0) < 0)
+ scmd_printk(KERN_ERR, hostdata->connected, "%s: End of DMA timeout\n",
+ __func__);
+ }
+
+ hostdata->pdma_residual = residual;
- while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
- ; // TIMEOUT
return 0;
}
static int generic_NCR5380_dma_xfer_len(struct NCR5380_hostdata *hostdata,
struct scsi_cmnd *cmd)
{
- int transfersize = cmd->transfersize;
+ int transfersize = NCR5380_to_ncmd(cmd)->this_residual;
if (hostdata->flags & FLAG_NO_PSEUDO_DMA)
return 0;
- /* Limit transfers to 32K, for xx400 & xx406
- * pseudoDMA that transfers in 128 bytes blocks.
- */
- if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
- !(cmd->SCp.this_residual % transfersize))
- transfersize = 32 * 1024;
-
/* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */
if (transfersize % 128)
- transfersize = 0;
+ return 0;
+
+ /* Limit PDMA send to 512 B to avoid random corruption on DTC3181E */
+ if (hostdata->board == BOARD_DTC3181E &&
+ cmd->sc_data_direction == DMA_TO_DEVICE)
+ transfersize = min(transfersize, 512);
- return transfersize;
+ return min(transfersize, DMA_MAX_SIZE);
}
-/*
- * Include the NCR5380 core code that we build our driver around
- */
-
+static int generic_NCR5380_dma_residual(struct NCR5380_hostdata *hostdata)
+{
+ return hostdata->pdma_residual;
+}
+
+/* Include the core driver code. */
+
#include "NCR5380.c"
-static struct scsi_host_template driver_template = {
+static const struct scsi_host_template driver_template = {
.module = THIS_MODULE,
.proc_name = DRV_MODULE_NAME,
.name = "Generic NCR5380/NCR53C400 SCSI",
.info = generic_NCR5380_info,
.queuecommand = generic_NCR5380_queue_command,
.eh_abort_handler = generic_NCR5380_abort,
- .eh_bus_reset_handler = generic_NCR5380_bus_reset,
+ .eh_host_reset_handler = generic_NCR5380_host_reset,
.can_queue = 16,
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = 2,
- .use_clustering = DISABLE_CLUSTERING,
- .cmd_size = NCR5380_CMD_SIZE,
+ .dma_boundary = PAGE_SIZE - 1,
+ .cmd_size = sizeof(struct NCR5380_cmd),
.max_sectors = 128,
};
-
static int generic_NCR5380_isa_match(struct device *pdev, unsigned int ndev)
{
int ret = generic_NCR5380_init_one(&driver_template, pdev, base[ndev],
- irq[ndev], card[ndev]);
+ irq[ndev], card[ndev]);
if (ret) {
if (base[ndev])
printk(KERN_WARNING "Card not found at address 0x%03x\n",
@@ -686,12 +721,11 @@ static int generic_NCR5380_isa_match(struct device *pdev, unsigned int ndev)
return 1;
}
-static int generic_NCR5380_isa_remove(struct device *pdev,
- unsigned int ndev)
+static void generic_NCR5380_isa_remove(struct device *pdev,
+ unsigned int ndev)
{
generic_NCR5380_release_resources(dev_get_drvdata(pdev));
dev_set_drvdata(pdev, NULL);
- return 0;
}
static struct isa_driver generic_NCR5380_isa_driver = {
@@ -703,14 +737,14 @@ static struct isa_driver generic_NCR5380_isa_driver = {
};
#ifdef CONFIG_PNP
-static struct pnp_device_id generic_NCR5380_pnp_ids[] = {
+static const struct pnp_device_id generic_NCR5380_pnp_ids[] = {
{ .id = "DTC436e", .driver_data = BOARD_DTC3181E },
{ .id = "" }
};
MODULE_DEVICE_TABLE(pnp, generic_NCR5380_pnp_ids);
static int generic_NCR5380_pnp_probe(struct pnp_dev *pdev,
- const struct pnp_device_id *id)
+ const struct pnp_device_id *id)
{
int base, irq;
@@ -721,7 +755,7 @@ static int generic_NCR5380_pnp_probe(struct pnp_dev *pdev,
irq = pnp_irq(pdev, 0);
return generic_NCR5380_init_one(&driver_template, &pdev->dev, base, irq,
- id->driver_data);
+ id->driver_data);
}
static void generic_NCR5380_pnp_remove(struct pnp_dev *pdev)
generated by cgit (git 2.34.1) at 2025-12-26 16:31:53 +0000