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-rw-r--r--drivers/scsi/mac_esp.c754
1 files changed, 754 insertions, 0 deletions
diff --git a/drivers/scsi/mac_esp.c b/drivers/scsi/mac_esp.c
new file mode 100644
index 00000000000..c94c8db8465
--- /dev/null
+++ b/drivers/scsi/mac_esp.c
@@ -0,0 +1,754 @@
+/*
+ * 68k mac 53c9[46] scsi driver
+ *
+ * copyright (c) 1998, David Weis weisd3458@uni.edu
+ *
+ * debugging on Quadra 800 and 660AV Michael Schmitz, Dave Kilzer 7/98
+ *
+ * based loosely on cyber_esp.c
+ */
+
+/* these are unused for now */
+#define myreadl(addr) (*(volatile unsigned int *) (addr))
+#define mywritel(b, addr) ((*(volatile unsigned int *) (addr)) = (b))
+
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "NCR53C9x.h"
+
+#include <asm/io.h>
+
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/macints.h>
+#include <asm/machw.h>
+#include <asm/mac_via.h>
+
+#include <asm/pgtable.h>
+
+#include <asm/macintosh.h>
+
+/* #define DEBUG_MAC_ESP */
+
+#define mac_turnon_irq(x) mac_enable_irq(x)
+#define mac_turnoff_irq(x) mac_disable_irq(x)
+
+extern void esp_handle(struct NCR_ESP *esp);
+extern void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs);
+
+static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count);
+static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd *sp);
+static void dma_dump_state(struct NCR_ESP * esp);
+static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length);
+static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length);
+static void dma_ints_off(struct NCR_ESP * esp);
+static void dma_ints_on(struct NCR_ESP * esp);
+static int dma_irq_p(struct NCR_ESP * esp);
+static int dma_irq_p_quick(struct NCR_ESP * esp);
+static void dma_led_off(struct NCR_ESP * esp);
+static void dma_led_on(struct NCR_ESP *esp);
+static int dma_ports_p(struct NCR_ESP *esp);
+static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write);
+static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write);
+
+static int esp_dafb_dma_irq_p(struct NCR_ESP * espdev);
+static int esp_iosb_dma_irq_p(struct NCR_ESP * espdev);
+
+static volatile unsigned char cmd_buffer[16];
+ /* This is where all commands are put
+ * before they are transferred to the ESP chip
+ * via PIO.
+ */
+
+static int esp_initialized = 0;
+
+static int setup_num_esps = -1;
+static int setup_disconnect = -1;
+static int setup_nosync = -1;
+static int setup_can_queue = -1;
+static int setup_cmd_per_lun = -1;
+static int setup_sg_tablesize = -1;
+#ifdef SUPPORT_TAGS
+static int setup_use_tagged_queuing = -1;
+#endif
+static int setup_hostid = -1;
+
+/*
+ * Experimental ESP inthandler; check macints.c to make sure dev_id is
+ * set up properly!
+ */
+
+void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
+{
+ struct NCR_ESP *esp = (struct NCR_ESP *) dev_id;
+ int irq_p = 0;
+
+ /* Handle the one ESP interrupt showing at this IRQ level. */
+ if(((esp)->irq & 0xff) == irq) {
+ /*
+ * Debug ..
+ */
+ irq_p = esp->dma_irq_p(esp);
+ printk("mac_esp: irq_p %x current %p disconnected %p\n",
+ irq_p, esp->current_SC, esp->disconnected_SC);
+
+ /*
+ * Mac: if we're here, it's an ESP interrupt for sure!
+ */
+ if((esp->current_SC || esp->disconnected_SC)) {
+ esp->dma_ints_off(esp);
+
+ ESPIRQ(("I%d(", esp->esp_id));
+ esp_handle(esp);
+ ESPIRQ((")"));
+
+ esp->dma_ints_on(esp);
+ }
+ }
+}
+
+/*
+ * Debug hooks; use for playing with the interrupt flag testing and interrupt
+ * acknowledge on the various machines
+ */
+
+void scsi_esp_polled(int irq, void *dev_id, struct pt_regs *pregs)
+{
+ if (esp_initialized == 0)
+ return;
+
+ mac_esp_intr(irq, dev_id, pregs);
+}
+
+void fake_intr(int irq, void *dev_id, struct pt_regs *pregs)
+{
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: got irq\n");
+#endif
+
+ mac_esp_intr(irq, dev_id, pregs);
+}
+
+irqreturn_t fake_drq(int irq, void *dev_id, struct pt_regs *pregs)
+{
+ printk("mac_esp: got drq\n");
+ return IRQ_HANDLED;
+}
+
+#define DRIVER_SETUP
+
+/*
+ * Function : mac_esp_setup(char *str)
+ *
+ * Purpose : booter command line initialization of the overrides array,
+ *
+ * Inputs : str - parameters, separated by commas.
+ *
+ * Currently unused in the new driver; need to add settable parameters to the
+ * detect function.
+ *
+ */
+
+static int __init mac_esp_setup(char *str) {
+#ifdef DRIVER_SETUP
+ /* Format of mac53c9x parameter is:
+ * mac53c9x=<num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
+ * Negative values mean don't change.
+ */
+
+ char *this_opt;
+ long opt;
+
+ this_opt = strsep (&str, ",");
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+
+ if (opt >= 0 && opt <= 2)
+ setup_num_esps = opt;
+ else if (opt > 2)
+ printk( "mac_esp_setup: invalid number of hosts %ld !\n", opt );
+
+ this_opt = strsep (&str, ",");
+ }
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+
+ if (opt > 0)
+ setup_disconnect = opt;
+
+ this_opt = strsep (&str, ",");
+ }
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+
+ if (opt >= 0)
+ setup_nosync = opt;
+
+ this_opt = strsep (&str, ",");
+ }
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+
+ if (opt > 0)
+ setup_can_queue = opt;
+
+ this_opt = strsep (&str, ",");
+ }
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+
+ if (opt > 0)
+ setup_cmd_per_lun = opt;
+
+ this_opt = strsep (&str, ",");
+ }
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+
+ if (opt >= 0) {
+ setup_sg_tablesize = opt;
+ /* Must be <= SG_ALL (255) */
+ if (setup_sg_tablesize > SG_ALL)
+ setup_sg_tablesize = SG_ALL;
+ }
+
+ this_opt = strsep (&str, ",");
+ }
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+
+ /* Must be between 0 and 7 */
+ if (opt >= 0 && opt <= 7)
+ setup_hostid = opt;
+ else if (opt > 7)
+ printk( "mac_esp_setup: invalid host ID %ld !\n", opt);
+
+ this_opt = strsep (&str, ",");
+ }
+#ifdef SUPPORT_TAGS
+ if(this_opt) {
+ opt = simple_strtol( this_opt, NULL, 0 );
+ if (opt >= 0)
+ setup_use_tagged_queuing = !!opt;
+ }
+#endif
+#endif
+ return 1;
+}
+
+__setup("mac53c9x=", mac_esp_setup);
+
+
+/*
+ * ESP address 'detection'
+ */
+
+unsigned long get_base(int chip_num)
+{
+ /*
+ * using the chip_num and mac model, figure out where the
+ * chips are mapped
+ */
+
+ unsigned long io_base = 0x50f00000;
+ unsigned int second_offset = 0x402;
+ unsigned long scsi_loc = 0;
+
+ switch (macintosh_config->scsi_type) {
+
+ /* 950, 900, 700 */
+ case MAC_SCSI_QUADRA2:
+ scsi_loc = io_base + 0xf000 + ((chip_num == 0) ? 0 : second_offset);
+ break;
+
+ /* av's */
+ case MAC_SCSI_QUADRA3:
+ scsi_loc = io_base + 0x18000 + ((chip_num == 0) ? 0 : second_offset);
+ break;
+
+ /* most quadra/centris models are like this */
+ case MAC_SCSI_QUADRA:
+ scsi_loc = io_base + 0x10000;
+ break;
+
+ default:
+ printk("mac_esp: get_base: hit default!\n");
+ scsi_loc = io_base + 0x10000;
+ break;
+
+ } /* switch */
+
+ printk("mac_esp: io base at 0x%lx\n", scsi_loc);
+
+ return scsi_loc;
+}
+
+/*
+ * Model dependent ESP setup
+ */
+
+int mac_esp_detect(Scsi_Host_Template * tpnt)
+{
+ int quick = 0;
+ int chipnum, chipspresent = 0;
+#if 0
+ unsigned long timeout;
+#endif
+
+ if (esp_initialized > 0)
+ return -ENODEV;
+
+ /* what do we have in this machine... */
+ if (MACHW_PRESENT(MAC_SCSI_96)) {
+ chipspresent ++;
+ }
+
+ if (MACHW_PRESENT(MAC_SCSI_96_2)) {
+ chipspresent ++;
+ }
+
+ /* number of ESPs present ? */
+ if (setup_num_esps >= 0) {
+ if (chipspresent >= setup_num_esps)
+ chipspresent = setup_num_esps;
+ else
+ printk("mac_esp_detect: num_hosts detected %d setup %d \n",
+ chipspresent, setup_num_esps);
+ }
+
+ /* TODO: add disconnect / nosync flags */
+
+ /* setup variables */
+ tpnt->can_queue =
+ (setup_can_queue > 0) ? setup_can_queue : 7;
+ tpnt->cmd_per_lun =
+ (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : 1;
+ tpnt->sg_tablesize =
+ (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_ALL;
+
+ if (setup_hostid >= 0)
+ tpnt->this_id = setup_hostid;
+ else {
+ /* use 7 as default */
+ tpnt->this_id = 7;
+ }
+
+#ifdef SUPPORT_TAGS
+ if (setup_use_tagged_queuing < 0)
+ setup_use_tagged_queuing = DEFAULT_USE_TAGGED_QUEUING;
+#endif
+
+ for (chipnum = 0; chipnum < chipspresent; chipnum ++) {
+ struct NCR_ESP * esp;
+
+ esp = esp_allocate(tpnt, (void *) NULL);
+ esp->eregs = (struct ESP_regs *) get_base(chipnum);
+
+ esp->dma_irq_p = &esp_dafb_dma_irq_p;
+ if (chipnum == 0) {
+
+ if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
+ /* most machines except those below :-) */
+ quick = 1;
+ esp->dma_irq_p = &esp_iosb_dma_irq_p;
+ } else if (macintosh_config->scsi_type == MAC_SCSI_QUADRA3) {
+ /* mostly av's */
+ quick = 0;
+ } else {
+ /* q950, 900, 700 */
+ quick = 1;
+ out_be32(0xf9800024, 0x1d1);
+ esp->dregs = (void *) 0xf9800024;
+ }
+
+ } else { /* chipnum */
+
+ quick = 1;
+ out_be32(0xf9800028, 0x1d1);
+ esp->dregs = (void *) 0xf9800028;
+
+ } /* chipnum == 0 */
+
+ /* use pio for command bytes; pio for message/data: TBI */
+ esp->do_pio_cmds = 1;
+
+ /* Set the command buffer */
+ esp->esp_command = (volatile unsigned char*) cmd_buffer;
+ esp->esp_command_dvma = (__u32) cmd_buffer;
+
+ /* various functions */
+ esp->dma_bytes_sent = &dma_bytes_sent;
+ esp->dma_can_transfer = &dma_can_transfer;
+ esp->dma_dump_state = &dma_dump_state;
+ esp->dma_init_read = NULL;
+ esp->dma_init_write = NULL;
+ esp->dma_ints_off = &dma_ints_off;
+ esp->dma_ints_on = &dma_ints_on;
+
+ esp->dma_ports_p = &dma_ports_p;
+
+
+ /* Optional functions */
+ esp->dma_barrier = NULL;
+ esp->dma_drain = NULL;
+ esp->dma_invalidate = NULL;
+ esp->dma_irq_entry = NULL;
+ esp->dma_irq_exit = NULL;
+ esp->dma_led_on = NULL;
+ esp->dma_led_off = NULL;
+ esp->dma_poll = NULL;
+ esp->dma_reset = NULL;
+
+ /* SCSI chip speed */
+ /* below esp->cfreq = 40000000; */
+
+
+ if (quick) {
+ /* 'quick' means there's handshake glue logic like in the 5380 case */
+ esp->dma_setup = &dma_setup_quick;
+ } else {
+ esp->dma_setup = &dma_setup;
+ }
+
+ if (chipnum == 0) {
+
+ esp->irq = IRQ_MAC_SCSI;
+
+ request_irq(IRQ_MAC_SCSI, esp_intr, 0, "Mac ESP SCSI", esp->ehost);
+#if 0 /* conflicts with IOP ADB */
+ request_irq(IRQ_MAC_SCSIDRQ, fake_drq, 0, "Mac ESP DRQ", esp->ehost);
+#endif
+
+ if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
+ esp->cfreq = 16500000;
+ } else {
+ esp->cfreq = 25000000;
+ }
+
+
+ } else { /* chipnum == 1 */
+
+ esp->irq = IRQ_MAC_SCSIDRQ;
+#if 0 /* conflicts with IOP ADB */
+ request_irq(IRQ_MAC_SCSIDRQ, esp_intr, 0, "Mac ESP SCSI 2", esp->ehost);
+#endif
+
+ esp->cfreq = 25000000;
+
+ }
+
+ if (quick) {
+ printk("esp: using quick version\n");
+ }
+
+ printk("esp: addr at 0x%p\n", esp->eregs);
+
+ esp->scsi_id = 7;
+ esp->diff = 0;
+
+ esp_initialize(esp);
+
+ } /* for chipnum */
+
+ if (chipspresent)
+ printk("\nmac_esp: %d esp controllers found\n", chipspresent);
+
+ esp_initialized = chipspresent;
+
+ return chipspresent;
+}
+
+static int mac_esp_release(struct Scsi_Host *shost)
+{
+ if (shost->irq)
+ free_irq(shost->irq, NULL);
+ if (shost->io_port && shost->n_io_port)
+ release_region(shost->io_port, shost->n_io_port);
+ scsi_unregister(shost);
+ return 0;
+}
+
+/*
+ * I've been wondering what this is supposed to do, for some time. Talking
+ * to Allen Briggs: These machines have an extra register someplace where the
+ * DRQ pin of the ESP can be monitored. That isn't useful for determining
+ * anything else (such as reselect interrupt or other magic) though.
+ * Maybe make the semantics should be changed like
+ * if (esp->current_SC)
+ * ... check DRQ flag ...
+ * else
+ * ... disconnected, check pending VIA interrupt ...
+ *
+ * There's a problem with using the dabf flag or mac_irq_pending() here: both
+ * seem to return 1 even though no interrupt is currently pending, resulting
+ * in esp_exec_cmd() holding off the next command, and possibly infinite loops
+ * in esp_intr().
+ * Short term fix: just use esp_status & ESP_STAT_INTR here, as long as we
+ * use simple PIO. The DRQ status will be important when implementing pseudo
+ * DMA mode (set up ESP transfer count, return, do a batch of bytes in PIO or
+ * 'hardware handshake' mode upon DRQ).
+ * If you plan on changing this (i.e. to save the esp_status register access in
+ * favor of a VIA register access or a shadow register for the IFR), make sure
+ * to try a debug version of this first to monitor what registers would be a good
+ * indicator of the ESP interrupt.
+ */
+
+static int esp_dafb_dma_irq_p(struct NCR_ESP * esp)
+{
+ unsigned int ret;
+ int sreg = esp_read(esp->eregs->esp_status);
+
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: esp_dafb_dma_irq_p dafb %d irq %d\n",
+ readl(esp->dregs), mac_irq_pending(IRQ_MAC_SCSI));
+#endif
+
+ sreg &= ESP_STAT_INTR;
+
+ /*
+ * maybe working; this is essentially what's used for iosb_dma_irq_p
+ */
+ if (sreg)
+ return 1;
+ else
+ return 0;
+
+ /*
+ * didn't work ...
+ */
+#if 0
+ if (esp->current_SC)
+ ret = readl(esp->dregs) & 0x200;
+ else if (esp->disconnected_SC)
+ ret = 1; /* sreg ?? */
+ else
+ ret = mac_irq_pending(IRQ_MAC_SCSI);
+
+ return(ret);
+#endif
+
+}
+
+/*
+ * See above: testing mac_irq_pending always returned 8 (SCSI IRQ) regardless
+ * of the actual ESP status.
+ */
+
+static int esp_iosb_dma_irq_p(struct NCR_ESP * esp)
+{
+ int ret = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
+ int sreg = esp_read(esp->eregs->esp_status);
+
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n",
+ mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI),
+ sreg, esp->current_SC, esp->disconnected_SC);
+#endif
+
+ sreg &= ESP_STAT_INTR;
+
+ if (sreg)
+ return (sreg);
+ else
+ return 0;
+}
+
+/*
+ * This seems to be OK for PIO at least ... usually 0 after PIO.
+ */
+
+static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count)
+{
+
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma bytes sent = %x\n", fifo_count);
+#endif
+
+ return fifo_count;
+}
+
+/*
+ * dma_can_transfer is used to switch between DMA and PIO, if DMA (pseudo)
+ * is ever implemented. Returning 0 here will use PIO.
+ */
+
+static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd * sp)
+{
+ unsigned long sz = sp->SCp.this_residual;
+#if 0 /* no DMA yet; make conditional */
+ if (sz > 0x10000000) {
+ sz = 0x10000000;
+ }
+ printk("mac_esp: dma can transfer = 0lx%x\n", sz);
+#else
+
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: pio to transfer = %ld\n", sz);
+#endif
+
+ sz = 0;
+#endif
+ return sz;
+}
+
+/*
+ * Not yet ...
+ */
+
+static void dma_dump_state(struct NCR_ESP * esp)
+{
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_dump_state: called\n");
+#endif
+#if 0
+ ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
+ esp->esp_id, ((struct mac_dma_registers *)
+ (esp->dregs))->cond_reg));
+#endif
+}
+
+/*
+ * DMA setup: should be used to set up the ESP transfer count for pseudo
+ * DMA transfers; need a DRQ transfer function to do the actual transfer
+ */
+
+static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length)
+{
+ printk("mac_esp: dma_init_read\n");
+}
+
+
+static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length)
+{
+ printk("mac_esp: dma_init_write\n");
+}
+
+
+static void dma_ints_off(struct NCR_ESP * esp)
+{
+ mac_turnoff_irq(esp->irq);
+}
+
+
+static void dma_ints_on(struct NCR_ESP * esp)
+{
+ mac_turnon_irq(esp->irq);
+}
+
+/*
+ * generic dma_irq_p(), unused
+ */
+
+static int dma_irq_p(struct NCR_ESP * esp)
+{
+ int i = esp_read(esp->eregs->esp_status);
+
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_irq_p status %d\n", i);
+#endif
+
+ return (i & ESP_STAT_INTR);
+}
+
+static int dma_irq_p_quick(struct NCR_ESP * esp)
+{
+ /*
+ * Copied from iosb_dma_irq_p()
+ */
+ int ret = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
+ int sreg = esp_read(esp->eregs->esp_status);
+
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n",
+ mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI),
+ sreg, esp->current_SC, esp->disconnected_SC);
+#endif
+
+ sreg &= ESP_STAT_INTR;
+
+ if (sreg)
+ return (sreg);
+ else
+ return 0;
+
+}
+
+static void dma_led_off(struct NCR_ESP * esp)
+{
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_led_off: called\n");
+#endif
+}
+
+
+static void dma_led_on(struct NCR_ESP * esp)
+{
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_led_on: called\n");
+#endif
+}
+
+
+static int dma_ports_p(struct NCR_ESP * esp)
+{
+ return 0;
+}
+
+
+static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write)
+{
+
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_setup\n");
+#endif
+
+ if (write) {
+ dma_init_read(esp, (char *) addr, count);
+ } else {
+ dma_init_write(esp, (char *) addr, count);
+ }
+}
+
+
+static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write)
+{
+#ifdef DEBUG_MAC_ESP
+ printk("mac_esp: dma_setup_quick\n");
+#endif
+}
+
+static Scsi_Host_Template driver_template = {
+ .proc_name = "mac_esp",
+ .name = "Mac 53C9x SCSI",
+ .detect = mac_esp_detect,
+ .slave_alloc = esp_slave_alloc,
+ .slave_destroy = esp_slave_destroy,
+ .release = mac_esp_release,
+ .info = esp_info,
+ .queuecommand = esp_queue,
+ .eh_abort_handler = esp_abort,
+ .eh_bus_reset_handler = esp_reset,
+ .can_queue = 7,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = 1,
+ .use_clustering = DISABLE_CLUSTERING
+};
+
+
+#include "scsi_module.c"
+
+MODULE_LICENSE("GPL");
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