308 lines
8.4 KiB
C
308 lines
8.4 KiB
C
/*
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* jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
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*
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* Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
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*
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* jazz_esp is based on David S. Miller's ESP driver and cyber_esp
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*/
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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 "scsi.h"
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#include <scsi/scsi_host.h>
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#include "NCR53C9x.h"
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#include <asm/irq.h>
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#include <asm/jazz.h>
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#include <asm/jazzdma.h>
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#include <asm/dma.h>
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#include <asm/pgtable.h>
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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, struct 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 vaddress, int length);
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static void dma_init_write(struct NCR_ESP *esp, __u32 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_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_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
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static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
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static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
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static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
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static void dma_advance_sg (struct scsi_cmnd *sp);
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static void dma_led_off(struct NCR_ESP *);
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static void dma_led_on(struct NCR_ESP *);
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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 trasfered to the ESP chip
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* via PIO.
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*/
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static int jazz_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->dma_channel != 0xff)
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free_dma(shost->dma_channel);
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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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/***************************************************************** Detection */
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static int jazz_esp_detect(struct scsi_host_template *tpnt)
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{
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struct NCR_ESP *esp;
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struct ConfigDev *esp_dev;
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/*
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* first assumption it is there:-)
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*/
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if (1) {
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esp_dev = NULL;
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esp = esp_allocate(tpnt, (void *) esp_dev);
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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 = 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_poll = NULL;
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esp->dma_reset = NULL;
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esp->dma_led_off = &dma_led_off;
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esp->dma_led_on = &dma_led_on;
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/* virtual DMA functions */
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esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
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esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
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esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
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esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
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esp->dma_advance_sg = &dma_advance_sg;
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/* SCSI chip speed */
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esp->cfreq = 40000000;
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/*
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* we don't give the address of DMA channel, but the number
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* of DMA channel, so we can use the jazz DMA functions
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*
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*/
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esp->dregs = (void *) JAZZ_SCSI_DMA;
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/* ESP register base */
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esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
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/* Set the command buffer */
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esp->esp_command = (volatile unsigned char *)cmd_buffer;
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/* get virtual dma address for command buffer */
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esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));
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esp->irq = JAZZ_SCSI_IRQ;
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request_irq(JAZZ_SCSI_IRQ, esp_intr, IRQF_DISABLED, "JAZZ SCSI",
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esp->ehost);
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/*
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* FIXME, look if the scsi id is available from NVRAM
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*/
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esp->scsi_id = 7;
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/* Check for differential SCSI-bus */
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/* What is this stuff? */
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esp->diff = 0;
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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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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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return fifo_count;
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}
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static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp)
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{
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/*
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* maximum DMA size is 1MB
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*/
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unsigned long sz = sp->SCp.this_residual;
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if(sz > 0x100000)
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sz = 0x100000;
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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 -- enable <%08x> residue <%08x\n",
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esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
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}
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static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
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{
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dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
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vdma_disable ((int)esp->dregs);
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vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
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vdma_set_addr ((int)esp->dregs, vaddress);
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vdma_set_count ((int)esp->dregs, length);
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vdma_enable ((int)esp->dregs);
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}
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static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
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{
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dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
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vdma_disable ((int)esp->dregs);
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vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
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vdma_set_addr ((int)esp->dregs, vaddress);
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vdma_set_count ((int)esp->dregs, length);
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vdma_enable ((int)esp->dregs);
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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 int dma_irq_p(struct NCR_ESP *esp)
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{
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return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
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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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int enable = vdma_get_enable((int)esp->dregs);
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return (enable & R4030_CHNL_ENABLE);
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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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/*
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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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static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
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{
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sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
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sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
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}
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static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
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{
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int sz = sp->SCp.buffers_residual;
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struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
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while (sz >= 0) {
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sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
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sz--;
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}
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sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
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}
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static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
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{
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vdma_free(sp->SCp.have_data_in);
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}
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static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
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{
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int sz = sp->use_sg - 1;
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struct scatterlist *sg = (struct scatterlist *)sp->request_buffer;
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while(sz >= 0) {
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vdma_free(sg[sz].dma_address);
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sz--;
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}
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}
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static void dma_advance_sg (struct scsi_cmnd *sp)
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{
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sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
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}
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#define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
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static void dma_led_off(struct NCR_ESP *esp)
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{
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#if 0
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*(unsigned char *)JAZZ_HDC_LED = 0;
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#endif
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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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#if 0
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*(unsigned char *)JAZZ_HDC_LED = 1;
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#endif
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}
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static struct scsi_host_template driver_template = {
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.proc_name = "jazz_esp",
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.proc_info = esp_proc_info,
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.name = "ESP 100/100a/200",
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.detect = jazz_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 = jazz_esp_release,
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.info = esp_info,
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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 = DISABLE_CLUSTERING,
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};
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#include "scsi_module.c"
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