/* fastlane.c: Driver for Phase5's Fastlane SCSI Controller.
*
* Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
*
* This driver is based on the CyberStorm driver, hence the occasional
* reference to CyberStorm.
*
* Betatesting & crucial adjustments by
* Patrik Rak (prak3264@ss1000.ms.mff.cuni.cz)
*
*/
/* TODO:
*
* o According to the doc from laire, it is required to reset the DMA when
* the transfer is done. ATM we reset DMA just before every new
* dma_init_(read|write).
*
* 1) Figure out how to make a cleaner merge with the sparc driver with regard
* to the caches and the Sparc MMU mapping.
* 2) Make as few routines required outside the generic driver. A lot of the
* routines in this file used to be inline!
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/interrupt.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "NCR53C9x.h"
#include <linux/zorro.h>
#include <asm/irq.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/pgtable.h>
/* Such day has just come... */
#if 0
/* Let this defined unless you really need to enable DMA IRQ one day */
#define NODMAIRQ
#endif
/* The controller registers can be found in the Z2 config area at these
* offsets:
*/
#define FASTLANE_ESP_ADDR 0x1000001
#define FASTLANE_DMA_ADDR 0x1000041
/* The Fastlane DMA interface */
struct fastlane_dma_registers {
volatile unsigned char cond_reg; /* DMA status (ro) [0x0000] */
#define ctrl_reg cond_reg /* DMA control (wo) [0x0000] */
unsigned char dmapad1[0x3f];
volatile unsigned char clear_strobe; /* DMA clear (wo) [0x0040] */
};
/* DMA status bits */
#define FASTLANE_DMA_MINT 0x80
#define FASTLANE_DMA_IACT 0x40
#define FASTLANE_DMA_CREQ 0x20
/* DMA control bits */
#define FASTLANE_DMA_FCODE 0xa0
#define FASTLANE_DMA_MASK 0xf3
#define FASTLANE_DMA_LED 0x10 /* HD led control 1 = on */
#define FASTLANE_DMA_WRITE 0x08 /* 1 = write */
#define FASTLANE_DMA_ENABLE 0x04 /* Enable DMA */
#define FASTLANE_DMA_EDI 0x02 /* Enable DMA IRQ ? */
#define FASTLANE_DMA_ESI 0x01 /* Enable SCSI IRQ */
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, __u32 addr, int length);
static void dma_init_write(struct NCR_ESP *esp, __u32 vaddr, 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 void dma_irq_exit(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 unsigned char ctrl_data = 0; /* Keep backup of the stuff written
* to ctrl_reg. Always write a copy
* to this register when writing to
* the hardware register!
*/
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 inline void dma_clear(struct NCR_ESP *esp)
{
struct fastlane_dma_registers *dregs =
(struct fastlane_dma_registers *) (esp->dregs);
unsigned long *t;
ctrl_data = (ctrl_data & FASTLANE_DMA_MASK);
dregs->ctrl_reg = ctrl_data;
t = (unsigned long *)(esp->edev);
dregs->clear_strobe = 0;
*t = 0 ;
}
/***************************************************************** Detection */
int __init fastlane_esp_detect(struct scsi_host_template *tpnt)
{
struct NCR_ESP *esp;
struct zorro_dev *z = NULL;
unsigned long address;
if ((z = zorro_find_device(ZORRO_PROD_PHASE5_BLIZZARD_1230_II_FASTLANE_Z3_CYBERSCSI_CYBERSTORM060, z))) {
unsigned long board = z->resource.start;
if (request_mem_region(board+FASTLANE_ESP_ADDR,
sizeof(struct ESP_regs), "NCR53C9x")) {
/* Check if this is really a fastlane controller. The problem
* is that also the cyberstorm and blizzard controllers use
* this ID value. Fortunately only Fastlane maps in Z3 space
*/
if (board < 0x1000000) {
goto err_release;
}
esp = esp_allocate(tpnt, (void *)board+FASTLANE_ESP_ADDR);
/* 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 = &dma_irq_exit;
esp->dma_led_on = &dma_led_on;
esp->dma_led_off = &dma_led_off;
esp->dma_poll = 0;
esp->dma_reset = 0;
/* Initialize the portBits (enable IRQs) */
ctrl_data = (FASTLANE_DMA_FCODE |
#ifndef NODMAIRQ
FASTLANE_DMA_EDI |
#endif
FASTLANE_DMA_ESI);
/* SCSI chip clock */
esp->cfreq = 40000000;
/* Map the physical address space into virtual kernel space */
address = (unsigned long)
z_ioremap(board, z->resource.end-board+1);
if(!address){
printk("Could not remap Fastlane controller memory!");
goto err_unregister;
}
/* The DMA registers on the Fastlane are mapped
* relative to the device (i.e. in the same Zorro
* I/O block).
*/
esp->dregs = (void *)(address + FASTLANE_DMA_ADDR);
/* ESP register base */
esp->eregs = (struct ESP_regs *)(address + FASTLANE_ESP_ADDR);
/* Board base */
esp->edev = (void *) address;
/* Set the command buffer */
esp->esp_command = cmd_buffer;
esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);
esp->irq = IRQ_AMIGA_PORTS;
esp->slot = board+FASTLANE_ESP_ADDR;
if (request_irq(IRQ_AMIGA_PORTS, esp_intr, IRQF_SHARED,
"Fastlane SCSI", esp->ehost)) {
printk(KERN_WARNING "Fastlane: Could not get IRQ%d, aborting.\n", IRQ_AMIGA_PORTS);
goto err_unmap;
}
/* Controller ID */
esp->scsi_id = 7;
/* We don't have a differential SCSI-bus. */
esp->diff = 0;
dma_clear(esp);
esp_initialize(esp);
printk("ESP: 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;
err_unmap:
z_iounmap((void *)address);
err_unregister:
scsi_unregister (esp->ehost);
err_release:
release_mem_region(z->resource.start+FASTLANE_ESP_ADDR,
sizeof(struct ESP_regs));
return 0;
}
/************************************************************* DMA Functions */
static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
{
/* Since the Fastlane DMA is fully dedicated to the ESP chip,
* the number of bytes sent (to the ESP chip) equals the number
* of bytes in the FIFO - there is no buffering in the DMA controller.
* XXXX Do I read this right? It is from host to ESP, right?
*/
return fifo_count;
}
static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
unsigned long sz = sp->SCp.this_residual;
if(sz > 0xfffc)
sz = 0xfffc;
return sz;
}
static void dma_dump_state(struct NCR_ESP *esp)
{
ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
esp->esp_id, ((struct fastlane_dma_registers *)
(esp->dregs))->cond_reg));
ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
amiga_custom.intreqr, amiga_custom.intenar));
}
static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
{
struct fastlane_dma_registers *dregs =
(struct fastlane_dma_registers *) (esp->dregs);
unsigned long *t;
cache_clear(addr, length);
dma_clear(esp);
t = (unsigned long *)((addr & 0x00ffffff) + esp->edev);
dregs->clear_strobe = 0;
*t = addr;
ctrl_data = (ctrl_data & FASTLANE_DMA_MASK) | FASTLANE_DMA_ENABLE;
dregs->ctrl_reg = ctrl_data;
}
static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
{
struct fastlane_dma_registers *dregs =
(struct fastlane_dma_registers *) (esp->dregs);
unsigned long *t;
cache_push(addr, length);
dma_clear(esp);
t = (unsigned long *)((addr & 0x00ffffff) + (esp->edev));
dregs->clear_strobe = 0;
*t = addr;
ctrl_data = ((ctrl_data & FASTLANE_DMA_MASK) |
FASTLANE_DMA_ENABLE |
FASTLANE_DMA_WRITE);
dregs->ctrl_reg = ctrl_data;
}
static void dma_ints_off(struct NCR_ESP *esp)
{
disable_irq(esp->irq);
}
static void dma_ints_on(struct NCR_ESP *esp)
{
enable_irq(esp->irq);
}
static void dma_irq_exit(struct NCR_ESP *esp)
{
struct fastlane_dma_registers *dregs =
(struct fastlane_dma_registers *) (esp->dregs);
dregs->ctrl_reg = ctrl_data & ~(FASTLANE_DMA_EDI|FASTLANE_DMA_ESI);
#ifdef __mc68000__
nop();
#endif
dregs->ctrl_reg = ctrl_data;
}
static int dma_irq_p(struct NCR_ESP *esp)
{
struct fastlane_dma_registers *dregs =
(struct fastlane_dma_registers *) (esp->dregs);
unsigned char dma_status;
dma_status = dregs->cond_reg;
if(dma_status & FASTLANE_DMA_IACT)
return 0; /* not our IRQ */
/* Return non-zero if ESP requested IRQ */
return (
#ifndef NODMAIRQ
(dma_status & FASTLANE_DMA_CREQ) &&
#endif
(!(dma_status & FASTLANE_DMA_MINT)) &&
(esp_read(((struct ESP_regs *) (esp->eregs))->esp_status) & ESP_STAT_INTR));
}
static void dma_led_off(struct NCR_ESP *esp)
{
ctrl_data &= ~FASTLANE_DMA_LED;
((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
}
static void dma_led_on(struct NCR_ESP *esp)
{
ctrl_data |= FASTLANE_DMA_LED;
((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
}
static int dma_ports_p(struct NCR_ESP *esp)
{
return ((amiga_custom.intenar) & IF_PORTS);
}
static void dma_setup(struct NCR_ESP *esp, __u32 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);
}
}
#define HOSTS_C
int fastlane_esp_release(struct Scsi_Host *instance)
{
#ifdef MODULE
unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
esp_deallocate((struct NCR_ESP *)instance->hostdata);
esp_release();
release_mem_region(address, sizeof(struct ESP_regs));
free_irq(IRQ_AMIGA_PORTS, esp_intr);
#endif
return 1;
}
static struct scsi_host_template driver_template = {
.proc_name = "esp-fastlane",
.proc_info = esp_proc_info,
.name = "Fastlane SCSI",
.detect = fastlane_esp_detect,
.slave_alloc = esp_slave_alloc,
.slave_destroy = esp_slave_destroy,
.release = fastlane_esp_release,
.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 = ENABLE_CLUSTERING
};
#include "scsi_module.c"
MODULE_LICENSE("GPL");
