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