diff options
Diffstat (limited to 'drivers/scsi/sun3x_esp.c')
| -rw-r--r-- | drivers/scsi/sun3x_esp.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/drivers/scsi/sun3x_esp.c b/drivers/scsi/sun3x_esp.c new file mode 100644 index 00000000000..5d1dc0e8ba2 --- /dev/null +++ b/drivers/scsi/sun3x_esp.c @@ -0,0 +1,394 @@ +/* sun3x_esp.c: EnhancedScsiProcessor Sun3x SCSI driver code. + * + * (C) 1999 Thomas Bogendoerfer (tsbogend@alpha.franken.de) + * + * Based on David S. Miller's esp driver + */ + +#include <linux/kernel.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/delay.h> +#include <linux/interrupt.h> + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include "NCR53C9x.h" + +#include <asm/sun3x.h> +#include <asm/dvma.h> +#include <asm/irq.h> + +extern struct NCR_ESP *espchain; + +static void dma_barrier(struct NCR_ESP *esp); +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_drain(struct NCR_ESP *esp); +static void dma_invalidate(struct NCR_ESP *esp); +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 void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr); +static int dma_ports_p(struct NCR_ESP *esp); +static void dma_reset(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, Scsi_Cmnd *sp); +static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp); +static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp); +static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp); +static void dma_advance_sg (Scsi_Cmnd *sp); + +/* Detecting ESP chips on the machine. This is the simple and easy + * version. + */ +int sun3x_esp_detect(Scsi_Host_Template *tpnt) +{ + struct NCR_ESP *esp; + struct ConfigDev *esp_dev; + + esp_dev = 0; + esp = esp_allocate(tpnt, (void *) esp_dev); + + /* Do command transfer with DMA */ + esp->do_pio_cmds = 0; + + /* 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 = &dma_barrier; + esp->dma_invalidate = &dma_invalidate; + esp->dma_drain = &dma_drain; + esp->dma_irq_entry = 0; + esp->dma_irq_exit = 0; + esp->dma_led_on = 0; + esp->dma_led_off = 0; + esp->dma_poll = &dma_poll; + esp->dma_reset = &dma_reset; + + /* 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 = 20000000; + esp->eregs = (struct ESP_regs *)(SUN3X_ESP_BASE); + esp->dregs = (void *)SUN3X_ESP_DMA; + + esp->esp_command = (volatile unsigned char *)dvma_malloc(DVMA_PAGE_SIZE); + esp->esp_command_dvma = dvma_vtob((unsigned long)esp->esp_command); + + esp->irq = 2; + if (request_irq(esp->irq, esp_intr, SA_INTERRUPT, + "SUN3X SCSI", esp->ehost)) { + esp_deallocate(esp); + return 0; + } + + esp->scsi_id = 7; + esp->diff = 0; + + esp_initialize(esp); + + /* for reasons beyond my knowledge (and which should likely be fixed) + sync mode doesn't work on a 3/80 at 5mhz. but it does at 4. */ + esp->sync_defp = 0x3f; + + 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; +} + +static void dma_do_drain(struct NCR_ESP *esp) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + + int count = 500000; + + while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0)) + udelay(1); + + if(!count) { + printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg); + } + + dregs->cond_reg |= DMA_FIFO_STDRAIN; + + count = 500000; + + while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0)) + udelay(1); + + if(!count) { + printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg); + } + +} + +static void dma_barrier(struct NCR_ESP *esp) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + int count = 500000; + + while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0)) + udelay(1); + + if(!count) { + printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg); + } + + dregs->cond_reg &= ~(DMA_ENABLE); +} + +/* This uses various DMA csr fields and the fifo flags count value to + * determine how many bytes were successfully sent/received by the ESP. + */ +static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + + int rval = dregs->st_addr - esp->esp_command_dvma; + + return rval - fifo_count; +} + +static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + return sp->SCp.this_residual; +} + +static void dma_drain(struct NCR_ESP *esp) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + int count = 500000; + + if(dregs->cond_reg & DMA_FIFO_ISDRAIN) { + dregs->cond_reg |= DMA_FIFO_STDRAIN; + while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0)) + udelay(1); + if(!count) { + printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg); + } + + } +} + +static void dma_invalidate(struct NCR_ESP *esp) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + + __u32 tmp; + int count = 500000; + + while(((tmp = dregs->cond_reg) & DMA_PEND_READ) && (--count > 0)) + udelay(1); + + if(!count) { + printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg); + } + + dregs->cond_reg = tmp | DMA_FIFO_INV; + dregs->cond_reg &= ~DMA_FIFO_INV; + +} + +static void dma_dump_state(struct NCR_ESP *esp) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + + ESPLOG(("esp%d: dma -- cond_reg<%08lx> addr<%08lx>\n", + esp->esp_id, dregs->cond_reg, dregs->st_addr)); +} + +static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + + dregs->st_addr = vaddress; + dregs->cond_reg |= (DMA_ST_WRITE | DMA_ENABLE); +} + +static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + + /* Set up the DMA counters */ + + dregs->st_addr = vaddress; + dregs->cond_reg = ((dregs->cond_reg & ~(DMA_ST_WRITE)) | DMA_ENABLE); +} + +static void dma_ints_off(struct NCR_ESP *esp) +{ + DMA_INTSOFF((struct sparc_dma_registers *) esp->dregs); +} + +static void dma_ints_on(struct NCR_ESP *esp) +{ + DMA_INTSON((struct sparc_dma_registers *) esp->dregs); +} + +static int dma_irq_p(struct NCR_ESP *esp) +{ + return DMA_IRQ_P((struct sparc_dma_registers *) esp->dregs); +} + +static void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr) +{ + int count = 50; + dma_do_drain(esp); + + /* Wait till the first bits settle. */ + while((*(volatile unsigned char *)vaddr == 0xff) && (--count > 0)) + udelay(1); + + if(!count) { +// printk("%s:%d timeout expire (data %02x)\n", __FILE__, __LINE__, +// esp_read(esp->eregs->esp_fdata)); + //mach_halt(); + vaddr[0] = esp_read(esp->eregs->esp_fdata); + vaddr[1] = esp_read(esp->eregs->esp_fdata); + } + +} + +static int dma_ports_p(struct NCR_ESP *esp) +{ + return (((struct sparc_dma_registers *) esp->dregs)->cond_reg + & DMA_INT_ENAB); +} + +/* Resetting various pieces of the ESP scsi driver chipset/buses. */ +static void dma_reset(struct NCR_ESP *esp) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *)esp->dregs; + + /* Punt the DVMA into a known state. */ + dregs->cond_reg |= DMA_RST_SCSI; + dregs->cond_reg &= ~(DMA_RST_SCSI); + DMA_INTSON(dregs); +} + +static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write) +{ + struct sparc_dma_registers *dregs = + (struct sparc_dma_registers *) esp->dregs; + unsigned long nreg = dregs->cond_reg; + +// printk("dma_setup %c addr %08x cnt %08x\n", +// write ? 'W' : 'R', addr, count); + + dma_do_drain(esp); + + if(write) + nreg |= DMA_ST_WRITE; + else { + nreg &= ~(DMA_ST_WRITE); + } + + nreg |= DMA_ENABLE; + dregs->cond_reg = nreg; + dregs->st_addr = addr; +} + +static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + sp->SCp.have_data_in = dvma_map((unsigned long)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, Scsi_Cmnd *sp) +{ + int sz = sp->SCp.buffers_residual; + struct scatterlist *sg = sp->SCp.buffer; + + while (sz >= 0) { + sg[sz].dvma_address = dvma_map((unsigned long)page_address(sg[sz].page) + + sg[sz].offset, sg[sz].length); + sz--; + } + sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address); +} + +static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + dvma_unmap((char *)sp->SCp.have_data_in); +} + +static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + int sz = sp->use_sg - 1; + struct scatterlist *sg = (struct scatterlist *)sp->buffer; + + while(sz >= 0) { + dvma_unmap((char *)sg[sz].dvma_address); + sz--; + } +} + +static void dma_advance_sg (Scsi_Cmnd *sp) +{ + sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address); +} + +static int sun3x_esp_release(struct Scsi_Host *instance) +{ + /* this code does not support being compiled as a module */ + return 1; + +} + +static Scsi_Host_Template driver_template = { + .proc_name = "sun3x_esp", + .proc_info = &esp_proc_info, + .name = "Sun ESP 100/100a/200", + .detect = sun3x_esp_detect, + .release = sun3x_esp_release, + .slave_alloc = esp_slave_alloc, + .slave_destroy = esp_slave_destroy, + .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" + +MODULE_LICENSE("GPL"); |