#include <linux/delay.h>
#include <linux/io.h>
#include <linux/nubus.h>
+#include <linux/slab.h>
#include <asm/irq.h>
#include <asm/dma.h>
-
#include <asm/macints.h>
#include <asm/macintosh.h>
void __iomem *pdma_io;
int error;
};
-static struct platform_device *internal_esp, *external_esp;
+static struct esp *esp_chips[2];
#define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \
platform_get_drvdata((struct platform_device *) \
#define MAC_ESP_PDMA_LOOP(operands) \
asm volatile ( \
- " tstw %2 \n" \
+ " tstw %1 \n" \
" jbeq 20f \n" \
"1: movew " operands " \n" \
"2: movew " operands " \n" \
"14: movew " operands " \n" \
"15: movew " operands " \n" \
"16: movew " operands " \n" \
- " subqw #1,%2 \n" \
+ " subqw #1,%1 \n" \
" jbne 1b \n" \
- "20: tstw %3 \n" \
+ "20: tstw %2 \n" \
" jbeq 30f \n" \
"21: movew " operands " \n" \
- " subqw #1,%3 \n" \
+ " subqw #1,%2 \n" \
" jbne 21b \n" \
- "30: tstw %4 \n" \
+ "30: tstw %3 \n" \
" jbeq 40f \n" \
"31: moveb " operands " \n" \
"32: nop \n" \
" .long 31b,40b \n" \
" .long 32b,40b \n" \
" .previous \n" \
- : "+a" (addr) \
- : "a" (mep->pdma_io), "r" (count32), "r" (count2), "g" (esp_count))
+ : "+a" (addr), "+r" (count32), "+r" (count2) \
+ : "g" (count1), "a" (mep->pdma_io))
static void mac_esp_send_pdma_cmd(struct esp *esp, u32 addr, u32 esp_count,
u32 dma_count, int write, u8 cmd)
do {
unsigned int count32 = esp_count >> 5;
unsigned int count2 = (esp_count & 0x1F) >> 1;
+ unsigned int count1 = esp_count & 1;
unsigned int start_addr = addr;
if (mac_esp_wait_for_dreq(esp))
break;
if (write) {
- MAC_ESP_PDMA_LOOP("%1@,%0@+");
+ MAC_ESP_PDMA_LOOP("%4@,%0@+");
esp_count -= addr - start_addr;
} else {
unsigned int n;
- MAC_ESP_PDMA_LOOP("%0@+,%1@");
+ MAC_ESP_PDMA_LOOP("%0@+,%4@");
if (mac_esp_wait_for_empty_fifo(esp))
break;
* Programmed IO routines follow.
*/
-static inline int mac_esp_wait_for_fifo(struct esp *esp)
+static inline unsigned int mac_esp_wait_for_fifo(struct esp *esp)
{
int i = 500000;
do {
- if (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES)
- return 0;
+ unsigned int fbytes = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
+
+ if (fbytes)
+ return fbytes;
udelay(2);
} while (--i);
printk(KERN_ERR PFX "FIFO is empty (sreg %02x)\n",
esp_read8(ESP_STATUS));
- return 1;
+ return 0;
}
static inline int mac_esp_wait_for_intr(struct esp *esp)
{
+ struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
int i = 500000;
do {
} while (--i);
printk(KERN_ERR PFX "IRQ timeout (sreg %02x)\n", esp->sreg);
+ mep->error = 1;
return 1;
}
static void mac_esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
u32 dma_count, int write, u8 cmd)
{
- unsigned long flags;
struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp);
u8 *fifo = esp->regs + ESP_FDATA * 16;
- local_irq_save(flags);
+ disable_irq(esp->host->irq);
cmd &= ~ESP_CMD_DMA;
mep->error = 0;
if (write) {
scsi_esp_cmd(esp, cmd);
- if (!mac_esp_wait_for_intr(esp)) {
- if (mac_esp_wait_for_fifo(esp))
- esp_count = 0;
- } else {
- esp_count = 0;
+ while (1) {
+ unsigned int n;
+
+ n = mac_esp_wait_for_fifo(esp);
+ if (!n)
+ break;
+
+ if (n > esp_count)
+ n = esp_count;
+ esp_count -= n;
+
+ MAC_ESP_PIO_LOOP("%2@,%0@+", n);
+
+ if (!esp_count)
+ break;
+
+ if (mac_esp_wait_for_intr(esp))
+ break;
+
+ if (((esp->sreg & ESP_STAT_PMASK) != ESP_DIP) &&
+ ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP))
+ break;
+
+ esp->ireg = esp_read8(ESP_INTRPT);
+ if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) !=
+ ESP_INTR_BSERV)
+ break;
+
+ scsi_esp_cmd(esp, ESP_CMD_TI);
}
} else {
scsi_esp_cmd(esp, ESP_CMD_FLUSH);
MAC_ESP_PIO_LOOP("%0@+,%2@", esp_count);
scsi_esp_cmd(esp, cmd);
- }
- while (esp_count) {
- unsigned int n;
-
- if (mac_esp_wait_for_intr(esp)) {
- mep->error = 1;
- break;
- }
-
- if (esp->sreg & ESP_STAT_SPAM) {
- printk(KERN_ERR PFX "gross error\n");
- mep->error = 1;
- break;
- }
-
- n = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
-
- if (write) {
- if (n > esp_count)
- n = esp_count;
- esp_count -= n;
-
- MAC_ESP_PIO_LOOP("%2@,%0@+", n);
+ while (esp_count) {
+ unsigned int n;
- if ((esp->sreg & ESP_STAT_PMASK) == ESP_STATP)
+ if (mac_esp_wait_for_intr(esp))
break;
- if (esp_count) {
- esp->ireg = esp_read8(ESP_INTRPT);
- if (esp->ireg & ESP_INTR_DC)
- break;
+ if (((esp->sreg & ESP_STAT_PMASK) != ESP_DOP) &&
+ ((esp->sreg & ESP_STAT_PMASK) != ESP_MOP))
+ break;
- scsi_esp_cmd(esp, ESP_CMD_TI);
- }
- } else {
esp->ireg = esp_read8(ESP_INTRPT);
- if (esp->ireg & ESP_INTR_DC)
+ if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) !=
+ ESP_INTR_BSERV)
break;
- n = MAC_ESP_FIFO_SIZE - n;
+ n = MAC_ESP_FIFO_SIZE -
+ (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES);
if (n > esp_count)
n = esp_count;
}
}
- local_irq_restore(flags);
+ enable_irq(esp->host->irq);
}
static int mac_esp_irq_pending(struct esp *esp)
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,
struct Scsi_Host *host;
struct esp *esp;
int err;
- int chips_present;
struct mac_esp_priv *mep;
if (!MACH_IS_MAC)
return -ENODEV;
- switch (macintosh_config->scsi_type) {
- case MAC_SCSI_QUADRA:
- case MAC_SCSI_QUADRA3:
- chips_present = 1;
- break;
- case MAC_SCSI_QUADRA2:
- if ((macintosh_config->ident == MAC_MODEL_Q900) ||
- (macintosh_config->ident == MAC_MODEL_Q950))
- chips_present = 2;
- else
- chips_present = 1;
- break;
- default:
- chips_present = 0;
- }
-
- if (dev->id + 1 > chips_present)
+ if (dev->id > 1)
return -ENODEV;
host = scsi_host_alloc(tpnt, sizeof(struct esp));
}
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)
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:
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);
.probe = esp_mac_probe,
.remove = __devexit_p(esp_mac_remove),
.driver = {
- .name = DRV_MODULE_NAME,
+ .name = DRV_MODULE_NAME,
+ .owner = THIS_MODULE,
},
};
static int __init mac_esp_init(void)
{
- int err;
-
- err = platform_driver_register(&esp_mac_driver);
- 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;
- }
-
- 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;
- }
-
- if (internal_esp || external_esp) {
- return 0;
- } else {
- platform_driver_unregister(&esp_mac_driver);
- return -ENOMEM;
- }
+ return platform_driver_register(&esp_mac_driver);
}
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 (external_esp) {
- platform_device_unregister(external_esp);
- external_esp = NULL;
- }
}
MODULE_DESCRIPTION("Mac ESP SCSI driver");
MODULE_AUTHOR("Finn Thain <fthain@telegraphics.com.au>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:" DRV_MODULE_NAME);
module_init(mac_esp_init);
module_exit(mac_esp_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff