/* blz2060.c: Driver for Blizzard 2060 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. */ /* TODO: * * 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 #include #include #include #include #include #include #include #include "scsi.h" #include "hosts.h" #include "NCR53C9x.h" #include "blz2060.h" #include #include #include #include #include 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 addr, 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_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); volatile unsigned char cmd_buffer[16]; /* This is where all commands are put * before they are transfered to the ESP chip * via PIO. */ /***************************************************************** Detection */ int blz2060_esp_detect(Scsi_Host_Template *tpnt) { struct NCR_ESP *esp; const struct ConfigDev *esp_dev; unsigned int key; unsigned long address; if ((key = zorro_find(ZORRO_PROD_PHASE5_BLIZZARD_2060, 0, 0))){ esp_dev = zorro_get_board(key); 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_led_on = &dma_led_on; esp->dma_led_off = &dma_led_off; esp->dma_poll = 0; esp->dma_reset = 0; /* SCSI chip speed */ esp->cfreq = 40000000; /* The DMA registers on the Blizzard are mapped * relative to the device (i.e. in the same Zorro * I/O block). */ address = (unsigned long)ZTWO_VADDR(esp_dev->cd_BoardAddr); esp->dregs = (void *)(address + BLZ2060_DMA_ADDR); /* ESP register base */ esp->eregs = (struct ESP_regs *)(address + BLZ2060_ESP_ADDR); /* Set the command buffer */ esp->esp_command = (volatile unsigned char*) cmd_buffer; esp->esp_command_dvma = virt_to_bus((unsigned long) cmd_buffer); esp->irq = IRQ_AMIGA_PORTS; request_irq(IRQ_AMIGA_PORTS, esp_intr, 0, "Blizzard 2060 SCSI", esp_intr); /* Figure out our scsi ID on the bus */ esp->scsi_id = 7; /* Check for differential SCSI-bus */ /* What is this stuff? */ esp->diff = 0; esp_initialize(esp); zorro_config_board(key, 0); 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 NCR_ESP *esp, int fifo_count) { /* Since the Blizzard 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) { /* I don't think there's any limit on the Blizzard DMA. So we use what * the ESP chip can handle (24 bit). */ unsigned long sz = sp->SCp.this_residual; if(sz > 0x1000000) sz = 0x1000000; return sz; } static void dma_dump_state(struct NCR_ESP *esp) { ESPLOG(("intreq:<%04x>, intena:<%04x>\n", custom.intreqr, custom.intenar)); } static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length) { struct blz2060_dma_registers *dregs = (struct blz2060_dma_registers *) (esp->dregs); cache_clear(addr, length); addr >>= 1; addr &= ~(BLZ2060_DMA_WRITE); dregs->dma_addr3 = (addr ) & 0xff; dregs->dma_addr2 = (addr >> 8) & 0xff; dregs->dma_addr1 = (addr >> 16) & 0xff; dregs->dma_addr0 = (addr >> 24) & 0xff; } static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length) { struct blz2060_dma_registers *dregs = (struct blz2060_dma_registers *) (esp->dregs); cache_push(addr, length); addr >>= 1; addr |= BLZ2060_DMA_WRITE; dregs->dma_addr3 = (addr ) & 0xff; dregs->dma_addr2 = (addr >> 8) & 0xff; dregs->dma_addr1 = (addr >> 16) & 0xff; dregs->dma_addr0 = (addr >> 24) & 0xff; } 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 int dma_irq_p(struct NCR_ESP *esp) { return (esp->eregs->esp_status & ESP_STAT_INTR); } static void dma_led_off(struct NCR_ESP *esp) { ((struct blz2060_dma_registers *) (esp->dregs))->dma_led_ctrl = BLZ2060_DMA_LED; } static void dma_led_on(struct NCR_ESP *esp) { ((struct blz2060_dma_registers *) (esp->dregs))->dma_led_ctrl = 0; } static int dma_ports_p(struct NCR_ESP *esp) { return ((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); } }