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/*
* jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
*
* Copyright (C) 1997 Thomas Boegndoerfer (tsbogend@alpha.franken.de)
*
* jazz_esp is based on David S. Miller's ESP driver and cyber_esp
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/malloc.h>
#include <linux/blk.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include "scsi.h"
#include "hosts.h"
#include "esp.h"
#include "jazz_esp.h"
#include <asm/irq.h>
#include <asm/jazz.h>
#include <asm/jazzdma.h>
#include <asm/dma.h>
#include <asm/pgtable.h>
static int dma_bytes_sent(struct Sparc_ESP *esp, int fifo_count);
static int dma_can_transfer(struct Sparc_ESP *esp, Scsi_Cmnd *sp);
static void dma_dump_state(struct Sparc_ESP *esp);
static void dma_init_read(struct Sparc_ESP *esp, char *vaddress, int length);
static void dma_init_write(struct Sparc_ESP *esp, char *vaddress, int length);
static void dma_ints_off(struct Sparc_ESP *esp);
static void dma_ints_on(struct Sparc_ESP *esp);
static int dma_irq_p(struct Sparc_ESP *esp);
static int dma_ports_p(struct Sparc_ESP *esp);
static void dma_setup(struct Sparc_ESP *esp, char *addr, int count, int write);
static void dma_mmu_get_scsi_one (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
static void dma_mmu_get_scsi_sgl (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
static void dma_mmu_release_scsi_one (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
static void dma_mmu_release_scsi_sgl (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
static void dma_advance_sg (Scsi_Cmnd *sp);
static void dma_led_off(struct Sparc_ESP *);
static void dma_led_on(struct Sparc_ESP *);
volatile unsigned char cmd_buffer[16];
/* This is where all commands are put
* before they are trasfered to the ESP chip
* via PIO.
*/
/***************************************************************** Detection */
int jazz_esp_detect(Scsi_Host_Template *tpnt)
{
struct Sparc_ESP *esp;
struct ConfigDev *esp_dev;
/*
* first assumption it is there:-)
*/
if (1) {
esp_dev = 0;
esp = esp_allocate(tpnt, (void *) esp_dev);
/* Do command transfer with programmed I/O */
esp->do_pio_cmds = 1;
/* Required 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 = &dma_init_read;
esp->dma_init_write = &dma_init_write;
esp->dma_ints_off = &dma_ints_off;
esp->dma_ints_on = &dma_ints_on;
esp->dma_irq_p = &dma_irq_p;
esp->dma_ports_p = &dma_ports_p;
esp->dma_setup = &dma_setup;
/* Optional functions */
esp->dma_barrier = 0;
esp->dma_drain = 0;
esp->dma_invalidate = 0;
esp->dma_irq_entry = 0;
esp->dma_irq_exit = 0;
esp->dma_poll = 0;
esp->dma_reset = 0;
esp->dma_led_off = &dma_led_off;
esp->dma_led_on = &dma_led_on;
/* virtual DMA functions */
esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
esp->dma_advance_sg = &dma_advance_sg;
/* SCSI chip speed */
esp->cfreq = 40000000;
/*
* we don't give the address of DMA channel, but the number
* of DMA channel, so we can use the jazz DMA functions
*
*/
esp->dregs = JAZZ_SCSI_DMA;
/* ESP register base */
esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
/* Set the command buffer */
esp->esp_command = (volatile unsigned char *)cmd_buffer;
esp->irq = JAZZ_SCSI_IRQ;
request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI", esp_intr);
/*
* FIXME, look if the scsi id is availabe from NVRAM
*/
esp->scsi_id = 7;
/* Check for differential SCSI-bus */
/* What is this stuff? */
esp->diff = 0;
esp_initialize(esp);
printk("\nESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
esps_running = esps_in_use;
return esps_in_use;
}
return 0;
}
/************************************************************* DMA Functions */
static int dma_bytes_sent(struct Sparc_ESP *esp, int fifo_count)
{
return fifo_count;
}
static int dma_can_transfer(struct Sparc_ESP *esp, Scsi_Cmnd *sp)
{
/*
* maximum DMA size is 1MB
*/
unsigned long sz = sp->SCp.this_residual;
if(sz > 0x100000)
sz = 0x100000;
return sz;
}
static void dma_dump_state(struct Sparc_ESP *esp)
{
ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_resdiue((int)esp->dregs)));
}
static void dma_init_read(struct Sparc_ESP *esp, char *vaddress, int length)
{
flush_cache_all();
vdma_disable ((int)esp->dregs);
vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
vdma_set_addr ((int)esp->dregs, (long)virt_to_bus(vaddress));
vdma_set_count ((int)esp->dregs, length);
vdma_enable ((int)esp->dregs);
}
static void dma_init_write(struct Sparc_ESP *esp, char *vaddress, int length)
{
flush_cache_all();
vdma_disable ((int)esp->dregs);
vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
vdma_set_addr ((int)esp->dregs, (long)virt_to_bus(vaddress));
vdma_set_count ((int)esp->dregs, length);
vdma_enable ((int)esp->dregs);
}
static void dma_ints_off(struct Sparc_ESP *esp)
{
disable_irq(esp->irq);
}
static void dma_ints_on(struct Sparc_ESP *esp)
{
enable_irq(esp->irq);
}
static int dma_irq_p(struct Sparc_ESP *esp)
{
return (esp->eregs->esp_status & ESP_STAT_INTR);
}
static int dma_ports_p(struct Sparc_ESP *esp)
{
int enable = vdma_get_enable((int)esp->dregs);
return (enable & R4030_CHNL_ENABLE);
}
static void dma_setup(struct Sparc_ESP *esp, char *addr, int count, int write)
{
/*
* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
* so when (write) is true, it actually means READ!
*/
if(write){
dma_init_read(esp, addr, count);
} else {
dma_init_write(esp, addr, count);
}
}
static void dma_mmu_get_scsi_one (struct Sparc_ESP *esp, Scsi_Cmnd *sp)
{
sp->SCp.have_data_in = vdma_alloc(PHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
}
static void dma_mmu_get_scsi_sgl (struct Sparc_ESP *esp, Scsi_Cmnd *sp)
{
int sz = sp->SCp.buffers_residual;
struct mmu_sglist *sg = (struct mmu_sglist *) sp->SCp.buffer;
while (sz >= 0) {
sg[sz].dvma_addr = vdma_alloc(PHYSADDR(sg[sz].addr), sg[sz].len);
sz--;
}
sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
}
static void dma_mmu_release_scsi_one (struct Sparc_ESP *esp, Scsi_Cmnd *sp)
{
vdma_free(sp->SCp.have_data_in);
}
static void dma_mmu_release_scsi_sgl (struct Sparc_ESP *esp, Scsi_Cmnd *sp)
{
int sz = sp->use_sg - 1;
struct mmu_sglist *sg = (struct mmu_sglist *)sp->buffer;
while(sz >= 0) {
vdma_free(sg[sz].dvma_addr);
sz--;
}
}
static void dma_advance_sg (Scsi_Cmnd *sp)
{
sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
}
#define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
static void dma_led_off(struct Sparc_ESP *esp)
{
#if 0
*(unsigned char *)JAZZ_HDC_LED = 0;
#endif
}
static void dma_led_on(struct Sparc_ESP *esp)
{
#if 0
*(unsigned char *)JAZZ_HDC_LED = 1;
#endif
}
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