diff options
Diffstat (limited to 'drivers/scsi/mca_53c9x.c')
| -rw-r--r-- | drivers/scsi/mca_53c9x.c | 520 |
1 files changed, 0 insertions, 520 deletions
diff --git a/drivers/scsi/mca_53c9x.c b/drivers/scsi/mca_53c9x.c deleted file mode 100644 index d693d0f21395..000000000000 --- a/drivers/scsi/mca_53c9x.c +++ /dev/null @@ -1,520 +0,0 @@ -/* mca_53c9x.c: Driver for the SCSI adapter found on NCR 35xx - * (and maybe some other) Microchannel machines - * - * Code taken mostly from Cyberstorm SCSI drivers - * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk) - * - * Hacked to work with the NCR MCA stuff by Tymm Twillman (tymm@computer.org) - * - * The CyberStorm SCSI driver (and this driver) is based on David S. Miller's - * ESP driver * for the Sparc computers. - * - * Special thanks to Ken Stewart at Symbios (LSI) for helping with info on - * the 86C01. I was on the brink of going ga-ga... - * - * Also thanks to Jesper Skov for helping me with info on how the Amiga - * does things... - */ - -/* - * This is currently only set up to use one 53c9x card at a time; it could be - * changed fairly easily to detect/use more than one, but I'm not too sure how - * many cards that use the 53c9x on MCA systems there are (if, in fact, there - * are cards that use them, other than the one built into some NCR systems)... - * If anyone requests this, I'll throw it in, otherwise it's not worth the - * effort. - */ - -/* - * Info on the 86C01 MCA interface chip at the bottom, if you care enough to - * look. - */ - -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/mca.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/mca-legacy.h> - -#include "scsi.h" -#include <scsi/scsi_host.h> -#include "NCR53C9x.h" - -#include <asm/dma.h> -#include <asm/irq.h> -#include <asm/mca_dma.h> -#include <asm/pgtable.h> - -/* - * From ibmmca.c (IBM scsi controller card driver) -- used for turning PS2 disk - * activity LED on and off - */ - -#define PS2_SYS_CTR 0x92 - -/* Ports the ncr's 53c94 can be put at; indexed by pos register value */ - -#define MCA_53C9X_IO_PORTS { \ - 0x0000, 0x0240, 0x0340, 0x0400, \ - 0x0420, 0x3240, 0x8240, 0xA240, \ - } - -/* - * Supposedly there were some cards put together with the 'c9x and 86c01. If - * they have different ID's from the ones on the 3500 series machines, - * you can add them here and hopefully things will work out. - */ - -#define MCA_53C9X_IDS { \ - 0x7F4C, \ - 0x0000, \ - } - -static int dma_bytes_sent(struct NCR_ESP *, int); -static int dma_can_transfer(struct NCR_ESP *, Scsi_Cmnd *); -static void dma_dump_state(struct NCR_ESP *); -static void dma_init_read(struct NCR_ESP *, __u32, int); -static void dma_init_write(struct NCR_ESP *, __u32, int); -static void dma_ints_off(struct NCR_ESP *); -static void dma_ints_on(struct NCR_ESP *); -static int dma_irq_p(struct NCR_ESP *); -static int dma_ports_p(struct NCR_ESP *); -static void dma_setup(struct NCR_ESP *, __u32, int, int); -static void dma_led_on(struct NCR_ESP *); -static void dma_led_off(struct NCR_ESP *); - -/* This is where all commands are put before they are trasfered to the - * 53c9x via PIO. - */ - -static volatile unsigned char cmd_buffer[16]; - -/* - * We keep the structure that is used to access the registers on the 53c9x - * here. - */ - -static struct ESP_regs eregs; - -/***************************************************************** Detection */ -static int mca_esp_detect(struct scsi_host_template *tpnt) -{ - struct NCR_ESP *esp; - static int io_port_by_pos[] = MCA_53C9X_IO_PORTS; - int mca_53c9x_ids[] = MCA_53C9X_IDS; - int *id_to_check = mca_53c9x_ids; - int slot; - int pos[3]; - unsigned int tmp_io_addr; - unsigned char tmp_byte; - - - if (!MCA_bus) - return 0; - - while (*id_to_check) { - if ((slot = mca_find_adapter(*id_to_check, 0)) != - MCA_NOTFOUND) - { - esp = esp_allocate(tpnt, NULL, 0); - - pos[0] = mca_read_stored_pos(slot, 2); - pos[1] = mca_read_stored_pos(slot, 3); - pos[2] = mca_read_stored_pos(slot, 4); - - esp->eregs = &eregs; - - /* - * IO port base is given in the first (non-ID) pos - * register, like so: - * - * Bits 3 2 1 IO base - * ---------------------------- - * 0 0 0 <disabled> - * 0 0 1 0x0240 - * 0 1 0 0x0340 - * 0 1 1 0x0400 - * 1 0 0 0x0420 - * 1 0 1 0x3240 - * 1 1 0 0x8240 - * 1 1 1 0xA240 - */ - - tmp_io_addr = - io_port_by_pos[(pos[0] & 0x0E) >> 1]; - - esp->eregs->io_addr = tmp_io_addr + 0x10; - - if (esp->eregs->io_addr == 0x0000) { - printk("Adapter is disabled.\n"); - break; - } - - /* - * IRQ is specified in bits 4 and 5: - * - * Bits 4 5 IRQ - * ----------------------- - * 0 0 3 - * 0 1 5 - * 1 0 7 - * 1 1 9 - */ - - esp->irq = ((pos[0] & 0x30) >> 3) + 3; - - /* - * DMA channel is in the low 3 bits of the second - * POS register - */ - - esp->dma = pos[1] & 7; - esp->slot = slot; - - if (request_irq(esp->irq, esp_intr, 0, - "NCR 53c9x SCSI", esp->ehost)) - { - printk("Unable to request IRQ %d.\n", esp->irq); - esp_deallocate(esp); - scsi_unregister(esp->ehost); - return 0; - } - - if (request_dma(esp->dma, "NCR 53c9x SCSI")) { - printk("Unable to request DMA channel %d.\n", - esp->dma); - free_irq(esp->irq, esp_intr); - esp_deallocate(esp); - scsi_unregister(esp->ehost); - return 0; - } - - request_region(tmp_io_addr, 32, "NCR 53c9x SCSI"); - - /* - * 86C01 handles DMA, IO mode, from address - * (base + 0x0a) - */ - - mca_disable_dma(esp->dma); - mca_set_dma_io(esp->dma, tmp_io_addr + 0x0a); - mca_enable_dma(esp->dma); - - /* Tell the 86C01 to give us interrupts */ - - tmp_byte = inb(tmp_io_addr + 0x02) | 0x40; - outb(tmp_byte, tmp_io_addr + 0x02); - - /* - * Scsi ID -- general purpose register, hi - * 2 bits; add 4 to this number to get the - * ID - */ - - esp->scsi_id = ((pos[2] & 0xC0) >> 6) + 4; - - /* 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 = NULL; - esp->dma_drain = NULL; - esp->dma_invalidate = NULL; - esp->dma_irq_entry = NULL; - esp->dma_irq_exit = NULL; - esp->dma_led_on = dma_led_on; - esp->dma_led_off = dma_led_off; - esp->dma_poll = NULL; - esp->dma_reset = NULL; - - /* Set the command buffer */ - - esp->esp_command = (volatile unsigned char*) - cmd_buffer; - esp->esp_command_dvma = isa_virt_to_bus(cmd_buffer); - - /* SCSI chip speed */ - - esp->cfreq = 25000000; - - /* Differential SCSI? I think not. */ - - esp->diff = 0; - - esp_initialize(esp); - - printk(" Adapter found in slot %2d: io port 0x%x " - "irq %d dma channel %d\n", slot + 1, tmp_io_addr, - esp->irq, esp->dma); - - mca_set_adapter_name(slot, "NCR 53C9X SCSI Adapter"); - mca_mark_as_used(slot); - - break; - } - - id_to_check++; - } - - return esps_in_use; -} - - -/******************************************************************* Release */ - -static int mca_esp_release(struct Scsi_Host *host) -{ - struct NCR_ESP *esp = (struct NCR_ESP *)host->hostdata; - unsigned char tmp_byte; - - esp_deallocate(esp); - /* - * Tell the 86C01 to stop sending interrupts - */ - - tmp_byte = inb(esp->eregs->io_addr - 0x0E); - tmp_byte &= ~0x40; - outb(tmp_byte, esp->eregs->io_addr - 0x0E); - - free_irq(esp->irq, esp_intr); - free_dma(esp->dma); - - mca_mark_as_unused(esp->slot); - - return 0; -} - -/************************************************************* DMA Functions */ -static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count) -{ - /* Ask the 53c9x. It knows. */ - - return fifo_count; -} - -static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp) -{ - /* - * The MCA dma channels can only do up to 128K bytes at a time. - * (16 bit mode) - */ - - unsigned long sz = sp->SCp.this_residual; - if(sz > 0x20000) - sz = 0x20000; - return sz; -} - -static void dma_dump_state(struct NCR_ESP *esp) -{ - /* - * Doesn't quite match up to the other drivers, but we do what we - * can. - */ - - ESPLOG(("esp%d: dma channel <%d>\n", esp->esp_id, esp->dma)); - ESPLOG(("bytes left to dma: %d\n", mca_get_dma_residue(esp->dma))); -} - -static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length) -{ - unsigned long flags; - - - save_flags(flags); - cli(); - - mca_disable_dma(esp->dma); - mca_set_dma_mode(esp->dma, MCA_DMA_MODE_XFER | MCA_DMA_MODE_16 | - MCA_DMA_MODE_IO); - mca_set_dma_addr(esp->dma, addr); - mca_set_dma_count(esp->dma, length / 2); /* !!! */ - mca_enable_dma(esp->dma); - - restore_flags(flags); -} - -static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length) -{ - unsigned long flags; - - - save_flags(flags); - cli(); - - mca_disable_dma(esp->dma); - mca_set_dma_mode(esp->dma, MCA_DMA_MODE_XFER | MCA_DMA_MODE_WRITE | - MCA_DMA_MODE_16 | MCA_DMA_MODE_IO); - mca_set_dma_addr(esp->dma, addr); - mca_set_dma_count(esp->dma, length / 2); /* !!! */ - mca_enable_dma(esp->dma); - - restore_flags(flags); -} - -static void dma_ints_off(struct NCR_ESP *esp) -{ - /* - * Tell the 'C01 to shut up. All interrupts are routed through it. - */ - - outb(inb(esp->eregs->io_addr - 0x0E) & ~0x40, - esp->eregs->io_addr - 0x0E); -} - -static void dma_ints_on(struct NCR_ESP *esp) -{ - /* - * Ok. You can speak again. - */ - - outb(inb(esp->eregs->io_addr - 0x0E) | 0x40, - esp->eregs->io_addr - 0x0E); -} - -static int dma_irq_p(struct NCR_ESP *esp) -{ - /* - * DaveM says that this should return a "yes" if there is an interrupt - * or a DMA error occurred. I copied the Amiga driver's semantics, - * though, because it seems to work and we can't really tell if - * a DMA error happened. This gives the "yes" if the scsi chip - * is sending an interrupt and no DMA activity is taking place - */ - - return (!(inb(esp->eregs->io_addr - 0x04) & 1) && - !(inb(esp->eregs->io_addr - 0x04) & 2) ); -} - -static int dma_ports_p(struct NCR_ESP *esp) -{ - /* - * Check to see if interrupts are enabled on the 'C01 (in case abort - * is entered multiple times, so we only do the abort once) - */ - - return (inb(esp->eregs->io_addr - 0x0E) & 0x40) ? 1:0; -} - -static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write) -{ - if(write){ - dma_init_write(esp, addr, count); - } else { - dma_init_read(esp, addr, count); - } -} - -/* - * These will not play nicely with other disk controllers that try to use the - * disk active LED... but what can you do? Don't answer that. - * - * Stolen shamelessly from ibmmca.c -- IBM Microchannel SCSI adapter driver - * - */ - -static void dma_led_on(struct NCR_ESP *esp) -{ - outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR); -} - -static void dma_led_off(struct NCR_ESP *esp) -{ - outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR); -} - -static struct scsi_host_template driver_template = { - .proc_name = "mca_53c9x", - .name = "NCR 53c9x SCSI", - .detect = mca_esp_detect, - .slave_alloc = esp_slave_alloc, - .slave_destroy = esp_slave_destroy, - .release = mca_esp_release, - .queuecommand = esp_queue, - .eh_abort_handler = esp_abort, - .eh_bus_reset_handler = esp_reset, - .can_queue = 7, - .sg_tablesize = SG_ALL, - .cmd_per_lun = 1, - .unchecked_isa_dma = 1, - .use_clustering = DISABLE_CLUSTERING -}; - - -#include "scsi_module.c" - -/* - * OK, here's the goods I promised. The NCR 86C01 is an MCA interface chip - * that handles enabling/diabling IRQ, dma interfacing, IO port selection - * and other fun stuff. It takes up 16 addresses, and the chip it is - * connnected to gets the following 16. Registers are as follows: - * - * Offsets 0-1 : Card ID - * - * Offset 2 : Mode enable register -- - * Bit 7 : Data Word width (1 = 16, 0 = 8) - * Bit 6 : IRQ enable (1 = enabled) - * Bits 5,4 : IRQ select - * 0 0 : IRQ 3 - * 0 1 : IRQ 5 - * 1 0 : IRQ 7 - * 1 1 : IRQ 9 - * Bits 3-1 : Base Address - * 0 0 0 : <disabled> - * 0 0 1 : 0x0240 - * 0 1 0 : 0x0340 - * 0 1 1 : 0x0400 - * 1 0 0 : 0x0420 - * 1 0 1 : 0x3240 - * 1 1 0 : 0x8240 - * 1 1 1 : 0xA240 - * Bit 0 : Card enable (1 = enabled) - * - * Offset 3 : DMA control register -- - * Bit 7 : DMA enable (1 = enabled) - * Bits 6,5 : Preemt Count Select (transfers to complete after - * 'C01 has been preempted on MCA bus) - * 0 0 : 0 - * 0 1 : 1 - * 1 0 : 3 - * 1 1 : 7 - * (all these wacky numbers; I'm sure there's a reason somewhere) - * Bit 4 : Fairness enable (1 = fair bus priority) - * Bits 3-0 : Arbitration level (0-15 consecutive) - * - * Offset 4 : General purpose register - * Bits 7-3 : User definable (here, 7,6 are SCSI ID) - * Bits 2-0 : reserved - * - * Offset 10 : DMA decode register (used for IO based DMA; also can do - * PIO through this port) - * - * Offset 12 : Status - * Bits 7-2 : reserved - * Bit 1 : DMA pending (1 = pending) - * Bit 0 : IRQ pending (0 = pending) - * - * Exciting, huh? - * - */ |
