dec_esp.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:14k
- /*
- * dec_esp.c: Driver for SCSI chips on IOASIC based TURBOchannel DECstations
- * and TURBOchannel PMAZ-A cards
- *
- * TURBOchannel changes by Harald Koerfgen
- * PMAZ-A support by David Airlie
- *
- * based on jazz_esp.c:
- * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
- *
- * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
- *
- * 20000819 - Small PMAZ-AA fixes by Florian Lohoff <flo@rfc822.org>
- * Be warned the PMAZ-AA works currently as a single card.
- * Dont try to put multiple cards in one machine - They are
- * both detected but it may crash under high load garbling your
- * data.
- * 20001005 - Initialization fixes for 2.4.0-test9
- * Florian Lohoff <flo@rfc822.org>
- */
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/blk.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include "scsi.h"
- #include "hosts.h"
- #include "NCR53C9x.h"
- #include "dec_esp.h"
- #include <asm/irq.h>
- #include <asm/jazz.h>
- #include <asm/jazzdma.h>
- #include <asm/dma.h>
- #include <asm/pgtable.h>
- #include <asm/dec/tc.h>
- #include <asm/dec/interrupts.h>
- #include <asm/dec/ioasic_addrs.h>
- #include <asm/dec/ioasic_ints.h>
- #include <asm/dec/machtype.h>
- #include <asm/system.h>
- /*
- * Once upon a time the pmaz code used to be working but
- * it hasn't been maintained for quite some time.
- * It isn't working anymore but I'll leave here as a
- * starting point. #define this an be prepared for tons
- * of warnings and errors :)
- */
- static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
- static void dma_drain(struct NCR_ESP *esp);
- 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 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, Scsi_Cmnd * sp);
- static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, Scsi_Cmnd * sp);
- static void dma_advance_sg(Scsi_Cmnd * sp);
- static void pmaz_dma_drain(struct NCR_ESP *esp);
- static void pmaz_dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
- static void pmaz_dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
- static void pmaz_dma_ints_off(struct NCR_ESP *esp);
- static void pmaz_dma_ints_on(struct NCR_ESP *esp);
- static void pmaz_dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
- static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd * sp);
- #define TC_ESP_RAM_SIZE 0x20000
- #define ESP_TGT_DMA_SIZE ((TC_ESP_RAM_SIZE/7) & ~(sizeof(int)-1))
- #define ESP_NCMD 7
- #define TC_ESP_DMAR_MASK 0x1ffff
- #define TC_ESP_DMAR_WRITE 0x80000000
- #define TC_ESP_DMA_ADDR(x) ((unsigned)(x) & TC_ESP_DMAR_MASK)
- __u32 esp_virt_buffer;
- int scsi_current_length;
- volatile unsigned char cmd_buffer[16];
- volatile unsigned char pmaz_cmd_buffer[16];
- /* This is where all commands are put
- * before they are trasfered to the ESP chip
- * via PIO.
- */
- volatile unsigned long *scsi_dma_ptr;
- volatile unsigned long *scsi_next_ptr;
- volatile unsigned long *scsi_scr;
- volatile unsigned long *ioasic_ssr;
- volatile unsigned long *scsi_sdr0;
- volatile unsigned long *scsi_sdr1;
- static void scsi_dma_merr_int(int, void *, struct pt_regs *);
- static void scsi_dma_err_int(int, void *, struct pt_regs *);
- static void scsi_dma_int(int, void *, struct pt_regs *);
- static Scsi_Host_Template driver_template = SCSI_DEC_ESP;
- #include "scsi_module.c"
- /***************************************************************** Detection */
- int dec_esp_detect(Scsi_Host_Template * tpnt)
- {
- struct NCR_ESP *esp;
- struct ConfigDev *esp_dev;
- int slot;
- unsigned long mem_start;
- if (IOASIC) {
- esp_dev = 0;
- esp = esp_allocate(tpnt, (void *) esp_dev);
-
- scsi_dma_ptr = (unsigned long *) (system_base + IOCTL + SCSI_DMA_P);
- scsi_next_ptr = (unsigned long *) (system_base + IOCTL + SCSI_DMA_BP);
- scsi_scr = (unsigned long *) (system_base + IOCTL + SCSI_SCR);
- ioasic_ssr = (unsigned long *) (system_base + IOCTL + SSR);
- scsi_sdr0 = (unsigned long *) (system_base + IOCTL + SCSI_SDR0);
- scsi_sdr1 = (unsigned long *) (system_base + IOCTL + SCSI_SDR1);
- /* 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 = &dma_drain;
- 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 = 0;
- esp->dma_led_on = 0;
-
- /* 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 = 0;
- esp->dma_mmu_release_scsi_sgl = 0;
- esp->dma_advance_sg = &dma_advance_sg;
- /* SCSI chip speed */
- esp->cfreq = 25000000;
- /*
- * 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 *) (system_base + SCSI);
-
- /* Set the command buffer */
- esp->esp_command = (volatile unsigned char *) cmd_buffer;
-
- /* get virtual dma address for command buffer */
- esp->esp_command_dvma = (__u32) KSEG1ADDR((volatile unsigned char *) cmd_buffer);
-
- esp->irq = dec_interrupt[DEC_IRQ_ASC];
- esp->scsi_id = 7;
-
- /* Check for differential SCSI-bus */
- esp->diff = 0;
- esp_initialize(esp);
- if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
- "ncr53c94", NULL))
- goto err_dealloc;
- if (request_irq(dec_interrupt[DEC_IRQ_ASC_MERR],
- scsi_dma_merr_int, SA_INTERRUPT,
- "ncr53c94 error", NULL))
- goto err_free_irq;
- if (request_irq(dec_interrupt[DEC_IRQ_ASC_ERR],
- scsi_dma_err_int, SA_INTERRUPT,
- "ncr53c94 overrun", NULL))
- goto err_free_irq_merr;
- if (request_irq(dec_interrupt[DEC_IRQ_ASC_DMA],
- scsi_dma_int, SA_INTERRUPT,
- "ncr53c94 dma", NULL))
- goto err_free_irq_err;
-
- }
- if (TURBOCHANNEL) {
- while ((slot = search_tc_card("PMAZ-AA")) >= 0) {
- claim_tc_card(slot);
- esp_dev = 0;
- esp = esp_allocate(tpnt, (void *) esp_dev);
- mem_start = get_tc_base_addr(slot);
- /* Store base addr into esp struct */
- esp->slot = mem_start;
- esp->dregs = 0;
- esp->eregs = (struct ESP_regs *) (mem_start + DEC_SCSI_SREG);
- esp->do_pio_cmds = 1;
- /* Set the command buffer */
- esp->esp_command = (volatile unsigned char *) pmaz_cmd_buffer;
- /* get virtual dma address for command buffer */
- esp->esp_command_dvma = (__u32) KSEG0ADDR((volatile unsigned char *) pmaz_cmd_buffer);
- esp->cfreq = get_tc_speed();
- esp->irq = get_tc_irq_nr(slot);
- /* 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 = &pmaz_dma_init_read;
- esp->dma_init_write = &pmaz_dma_init_write;
- esp->dma_ints_off = &pmaz_dma_ints_off;
- esp->dma_ints_on = &pmaz_dma_ints_on;
- esp->dma_irq_p = &dma_irq_p;
- esp->dma_ports_p = &dma_ports_p;
- esp->dma_setup = &pmaz_dma_setup;
- /* Optional functions */
- esp->dma_barrier = 0;
- esp->dma_drain = &pmaz_dma_drain;
- 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 = 0;
- esp->dma_led_on = 0;
- esp->dma_mmu_get_scsi_one = pmaz_dma_mmu_get_scsi_one;
- esp->dma_mmu_get_scsi_sgl = 0;
- esp->dma_mmu_release_scsi_one = 0;
- esp->dma_mmu_release_scsi_sgl = 0;
- esp->dma_advance_sg = 0;
- if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
- "PMAZ_AA", NULL)) {
- esp_deallocate(esp);
- release_tc_card(slot);
- continue;
- }
- esp->scsi_id = 7;
- esp->diff = 0;
- esp_initialize(esp);
- }
- }
- if(nesps) {
- 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;
- err_free_irq_err:
- free_irq(dec_interrupt[DEC_IRQ_ASC_ERR], scsi_dma_err_int);
- err_free_irq_merr:
- free_irq(dec_interrupt[DEC_IRQ_ASC_MERR], scsi_dma_merr_int);
- err_free_irq:
- free_irq(esp->irq, esp_intr);
- err_dealloc:
- esp_deallocate(esp);
- return 0;
- }
- /************************************************************* DMA Functions */
- static void scsi_dma_merr_int(int irq, void *dev_id, struct pt_regs *regs)
- {
- printk("Got unexpected SCSI DMA Interrupt! < ");
- printk("SCSI_DMA_MEMRDERR ");
- printk(">n");
- }
- static void scsi_dma_err_int(int irq, void *dev_id, struct pt_regs *regs)
- {
- /* empty */
- }
- static void scsi_dma_int(int irq, void *dev_id, struct pt_regs *regs)
- {
- /* next page */
- *scsi_next_ptr = ((*scsi_dma_ptr + PAGE_SIZE) & PAGE_MASK) << 3;
- fast_iob();
- }
- static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
- {
- return fifo_count;
- }
- static void dma_drain(struct NCR_ESP *esp)
- {
- unsigned long nw = *scsi_scr;
- unsigned short *p = KSEG1ADDR((unsigned short *) ((*scsi_dma_ptr) >> 3));
- /*
- * Is there something in the dma buffers left?
- */
- if (nw) {
- switch (nw) {
- case 1:
- *p = (unsigned short) *scsi_sdr0;
- break;
- case 2:
- *p++ = (unsigned short) (*scsi_sdr0);
- *p = (unsigned short) ((*scsi_sdr0) >> 16);
- break;
- case 3:
- *p++ = (unsigned short) (*scsi_sdr0);
- *p++ = (unsigned short) ((*scsi_sdr0) >> 16);
- *p = (unsigned short) (*scsi_sdr1);
- break;
- default:
- printk("Strange: %d words in dma buffer leftn", (int) nw);
- break;
- }
- }
- }
- static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd * sp)
- {
- return sp->SCp.this_residual;;
- }
- static void dma_dump_state(struct NCR_ESP *esp)
- {
- /*
- ESPLOG(("esp%d: dma -- enable <%08x> residue <%08xn",
- esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_resdiue((int)esp->dregs)));
- */
- }
- static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
- {
- if (vaddress & 3)
- panic("dec_efs.c: unable to handle partial word transfers, yet...");
- dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
- *ioasic_ssr &= ~SCSI_DMA_EN;
- *scsi_scr = 0;
- *scsi_dma_ptr = vaddress << 3;
- /* prepare for next page */
- *scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
- *ioasic_ssr |= (SCSI_DMA_DIR | SCSI_DMA_EN);
- fast_iob();
- }
- static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
- {
- if (vaddress & 3)
- panic("dec_efs.c: unable to handle partial word transfers, yet...");
- dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
- *ioasic_ssr &= ~(SCSI_DMA_DIR | SCSI_DMA_EN);
- *scsi_scr = 0;
- *scsi_dma_ptr = vaddress << 3;
- /* prepare for next page */
- *scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
- *ioasic_ssr |= SCSI_DMA_EN;
- fast_iob();
- }
- static void dma_ints_off(struct NCR_ESP *esp)
- {
- disable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
- }
- static void dma_ints_on(struct NCR_ESP *esp)
- {
- enable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
- }
- static int dma_irq_p(struct NCR_ESP *esp)
- {
- return (esp->eregs->esp_status & ESP_STAT_INTR);
- }
- static int dma_ports_p(struct NCR_ESP *esp)
- {
- /*
- * FIXME: what's this good for?
- */
- return 1;
- }
- 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);
- }
- }
- /*
- * These aren't used yet
- */
- static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd * sp)
- {
- sp->SCp.have_data_in = PHYSADDR(sp->SCp.buffer);
- 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 mmu_sglist *sg = (struct mmu_sglist *) sp->SCp.buffer;
- while (sz >= 0) {
- sg[sz].dvma_addr = PHYSADDR(sg[sz].addr);
- sz--;
- }
- sp->SCp.ptr = (char *) ((unsigned long) sp->SCp.buffer->dma_address);
- }
- static void dma_advance_sg(Scsi_Cmnd * sp)
- {
- sp->SCp.ptr = (char *) ((unsigned long) sp->SCp.buffer->dma_address);
- }
- static void pmaz_dma_drain(struct NCR_ESP *esp)
- {
- memcpy((void *) (KSEG0ADDR(esp_virt_buffer)),
- (void *) ( esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE),
- scsi_current_length);
- }
- static void pmaz_dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
- {
- volatile int *dmareg = (volatile int *) (esp->slot + DEC_SCSI_DMAREG);
- if (length > ESP_TGT_DMA_SIZE)
- length = ESP_TGT_DMA_SIZE;
- *dmareg = TC_ESP_DMA_ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE);
- iob();
- esp_virt_buffer = vaddress;
- scsi_current_length = length;
- }
- static void pmaz_dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
- {
- volatile int *dmareg = (volatile int *) ( esp->slot + DEC_SCSI_DMAREG );
- memcpy((void *) (esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE),
- KSEG0ADDR((void *) vaddress), length);
- *dmareg = TC_ESP_DMAR_WRITE |
- TC_ESP_DMA_ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE);
- iob();
- }
- static void pmaz_dma_ints_off(struct NCR_ESP *esp)
- {
- }
- static void pmaz_dma_ints_on(struct NCR_ESP *esp)
- {
- }
- static void pmaz_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) {
- pmaz_dma_init_read(esp, addr, count);
- } else {
- pmaz_dma_init_write(esp, addr, count);
- }
- }
- static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, Scsi_Cmnd * sp)
- {
- sp->SCp.have_data_in = (int) sp->SCp.ptr =
- (char *) KSEG0ADDR((sp->request_buffer));
- }