mac_esp.c

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/*
 * 68k mac 53c9[46] scsi driver
 *
 * copyright (c) 1998, David Weis [e-mail]
 *
 * 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 */

extern void esp_handle(struct NCR_ESP *esp);
extern void mac_esp_intr(int irq, void *dev_id);

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 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)
{
	if (esp_initialized == 0)
		return;

	mac_esp_intr(irq, dev_id);
}

void fake_intr(int irq, void *dev_id)
{
#ifdef DEBUG_MAC_ESP
	printk("mac_esp: got irq\n");
#endif

	mac_esp_intr(irq, dev_id);
}

irqreturn_t fake_drq(int irq, void *dev_id)
{
	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(struct 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, NULL, 0);
		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;