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