diff options
Diffstat (limited to 'drivers/scsi/jazz_esp.c')
| -rw-r--r-- | drivers/scsi/jazz_esp.c | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/scsi/jazz_esp.c b/drivers/scsi/jazz_esp.c new file mode 100644 index 000000000000..a642f736cf85 --- /dev/null +++ b/drivers/scsi/jazz_esp.c @@ -0,0 +1,329 @@ +/* + * jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture) + * + * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de) + * + * jazz_esp is based on David S. Miller's ESP driver and cyber_esp + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/delay.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 "scsi.h" +#include <scsi/scsi_host.h> +#include "NCR53C9x.h" + +#include <asm/irq.h> +#include <asm/jazz.h> +#include <asm/jazzdma.h> +#include <asm/dma.h> + +#include <asm/pgtable.h> + +static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count); +static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp); +static void dma_dump_state(struct NCR_ESP *esp); +static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length); +static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, 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 int dma_ports_p(struct NCR_ESP *esp); +static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write); +static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp); +static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp); +static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp); +static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp); +static void dma_advance_sg (struct scsi_cmnd *sp); +static void dma_led_off(struct NCR_ESP *); +static void dma_led_on(struct NCR_ESP *); + + +static volatile unsigned char cmd_buffer[16]; + /* This is where all commands are put + * before they are trasfered to the ESP chip + * via PIO. + */ + +int jazz_esp_detect(Scsi_Host_Template *tpnt); +static int jazz_esp_release(struct Scsi_Host *shost) +{ + if (shost->irq) + free_irq(shost->irq, NULL); + if (shost->dma_channel != 0xff) + free_dma(shost->dma_channel); + if (shost->io_port && shost->n_io_port) + release_region(shost->io_port, shost->n_io_port); + scsi_unregister(shost); + return 0; +} + +static Scsi_Host_Template driver_template = { + .proc_name = "jazz_esp", + .proc_info = &esp_proc_info, + .name = "ESP 100/100a/200", + .detect = jazz_esp_detect, + .slave_alloc = esp_slave_alloc, + .slave_destroy = esp_slave_destroy, + .release = jazz_esp_release, + .info = esp_info, + .queuecommand = esp_queue, + .eh_abort_handler = esp_abort, + .eh_bus_reset_handler = esp_reset, + .can_queue = 7, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = 1, + .use_clustering = DISABLE_CLUSTERING, +}; + +#include "scsi_module.c" + +/***************************************************************** Detection */ +static int jazz_esp_detect(struct scsi_host_template *tpnt) +{ + struct NCR_ESP *esp; + struct ConfigDev *esp_dev; + + /* + * first assumption it is there:-) + */ + if (1) { + esp_dev = 0; + 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_poll = 0; + esp->dma_reset = 0; + esp->dma_led_off = &dma_led_off; + esp->dma_led_on = &dma_led_on; + + /* virtual DMA functions */ + esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one; + esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl; + esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one; + esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl; + esp->dma_advance_sg = &dma_advance_sg; + + + /* SCSI chip speed */ + esp->cfreq = 40000000; + + /* + * we don't give the address of DMA channel, but the number + * of DMA channel, so we can use the jazz DMA functions + * + */ + esp->dregs = JAZZ_SCSI_DMA; + + /* ESP register base */ + esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE); + + /* Set the command buffer */ + esp->esp_command = (volatile unsigned char *)cmd_buffer; + + /* get virtual dma address for command buffer */ + esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer)); + + esp->irq = JAZZ_SCSI_IRQ; + request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI", + esp->ehost); + + /* + * FIXME, look if the scsi id is available from NVRAM + */ + esp->scsi_id = 7; + + /* Check for differential SCSI-bus */ + /* What is this stuff? */ + esp->diff = 0; + + esp_initialize(esp); + + printk("ESP: 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) +{ + return fifo_count; +} + +static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp) +{ + /* + * maximum DMA size is 1MB + */ + unsigned long sz = sp->SCp.this_residual; + if(sz > 0x100000) + sz = 0x100000; + return sz; +} + +static void dma_dump_state(struct NCR_ESP *esp) +{ + + ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n", + esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs))); +} + +static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length) +{ + dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length); + vdma_disable ((int)esp->dregs); + vdma_set_mode ((int)esp->dregs, DMA_MODE_READ); + vdma_set_addr ((int)esp->dregs, vaddress); + vdma_set_count ((int)esp->dregs, length); + vdma_enable ((int)esp->dregs); +} + +static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length) +{ + dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length); + vdma_disable ((int)esp->dregs); + vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE); + vdma_set_addr ((int)esp->dregs, vaddress); + vdma_set_count ((int)esp->dregs, length); + vdma_enable ((int)esp->dregs); +} + +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_read(esp->eregs->esp_status) & ESP_STAT_INTR); +} + +static int dma_ports_p(struct NCR_ESP *esp) +{ + int enable = vdma_get_enable((int)esp->dregs); + + return (enable & R4030_CHNL_ENABLE); +} + +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); + } +} + +static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp) +{ + sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(sp->SCp.buffer), sp->SCp.this_residual); + sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in); +} + +static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp) +{ + int sz = sp->SCp.buffers_residual; + struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer; + + while (sz >= 0) { + sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length); + sz--; + } + sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address); +} + +static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp) +{ + vdma_free(sp->SCp.have_data_in); +} + +static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp) +{ + int sz = sp->use_sg - 1; + struct scatterlist *sg = (struct scatterlist *)sp->buffer; + + while(sz >= 0) { + vdma_free(sg[sz].dma_address); + sz--; + } +} + +static void dma_advance_sg (struct scsi_cmnd *sp) +{ + sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address); +} + +#define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */ + +static void dma_led_off(struct NCR_ESP *esp) +{ +#if 0 + *(unsigned char *)JAZZ_HDC_LED = 0; +#endif +} + +static void dma_led_on(struct NCR_ESP *esp) +{ +#if 0 + *(unsigned char *)JAZZ_HDC_LED = 1; +#endif +} + +static struct scsi_host_template driver_template = { + .proc_name = "jazz_esp", + .proc_info = esp_proc_info, + .name = "ESP 100/100a/200", + .detect = jazz_esp_detect, + .slave_alloc = esp_slave_alloc, + .slave_destroy = esp_slave_destroy, + .release = jazz_esp_release, + .info = esp_info, + .queuecommand = esp_queue, + .eh_abort_handler = esp_abort, + .eh_bus_reset_handler = esp_reset, + .can_queue = 7, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = 1, + .use_clustering = DISABLE_CLUSTERING, +}; +#include "scsi_module.c" |