/* 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? * */