+++ /dev/null
-/*
- * 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>
- *
- * Copyright (C) 2002, 2003, 2005, 2006 Maciej W. Rozycki
- */
-
-#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/spinlock.h>
-#include <linux/stat.h>
-#include <linux/tc.h>
-
-#include <asm/dma.h>
-#include <asm/irq.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-
-#include <asm/dec/interrupts.h>
-#include <asm/dec/ioasic.h>
-#include <asm/dec/ioasic_addrs.h>
-#include <asm/dec/ioasic_ints.h>
-#include <asm/dec/machtype.h>
-#include <asm/dec/system.h>
-
-#define DEC_SCSI_SREG 0
-#define DEC_SCSI_DMAREG 0x40000
-#define DEC_SCSI_SRAM 0x80000
-#define DEC_SCSI_DIAG 0xC0000
-
-#include "scsi.h"
-#include <scsi/scsi_host.h>
-#include "NCR53C9x.h"
-
-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, 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_advance_sg(struct 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, struct 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.
- */
-
-static irqreturn_t scsi_dma_merr_int(int, void *);
-static irqreturn_t scsi_dma_err_int(int, void *);
-static irqreturn_t scsi_dma_int(int, void *);
-
-static struct scsi_host_template dec_esp_template = {
- .module = THIS_MODULE,
- .name = "NCR53C94",
- .info = esp_info,
- .queuecommand = esp_queue,
- .eh_abort_handler = esp_abort,
- .eh_bus_reset_handler = esp_reset,
- .slave_alloc = esp_slave_alloc,
- .slave_destroy = esp_slave_destroy,
- .proc_info = esp_proc_info,
- .proc_name = "dec_esp",
- .can_queue = 7,
- .sg_tablesize = SG_ALL,
- .cmd_per_lun = 1,
- .use_clustering = DISABLE_CLUSTERING,
-};
-
-static struct NCR_ESP *dec_esp_platform;
-
-/***************************************************************** Detection */
-static int dec_esp_platform_probe(void)
-{
- struct NCR_ESP *esp;
- int err = 0;
-
- if (IOASIC) {
- esp = esp_allocate(&dec_esp_template, NULL, 1);
-
- /* 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;
-
- esp->dregs = 0;
-
- /* ESP register base */
- esp->eregs = (void *)CKSEG1ADDR(dec_kn_slot_base +
- IOASIC_SCSI);
-
- /* Set the command buffer */
- esp->esp_command = (volatile unsigned char *) cmd_buffer;
-
- /* get virtual dma address for command buffer */
- esp->esp_command_dvma = virt_to_phys(cmd_buffer);
-
- esp->irq = dec_interrupt[DEC_IRQ_ASC];
-
- esp->scsi_id = 7;
-
- /* Check for differential SCSI-bus */
- esp->diff = 0;
-
- err = request_irq(esp->irq, esp_intr, IRQF_DISABLED,
- "ncr53c94", esp->ehost);
- if (err)
- goto err_alloc;
- err = request_irq(dec_interrupt[DEC_IRQ_ASC_MERR],
- scsi_dma_merr_int, IRQF_DISABLED,
- "ncr53c94 error", esp->ehost);
- if (err)
- goto err_irq;
- err = request_irq(dec_interrupt[DEC_IRQ_ASC_ERR],
- scsi_dma_err_int, IRQF_DISABLED,
- "ncr53c94 overrun", esp->ehost);
- if (err)
- goto err_irq_merr;
- err = request_irq(dec_interrupt[DEC_IRQ_ASC_DMA], scsi_dma_int,
- IRQF_DISABLED, "ncr53c94 dma", esp->ehost);
- if (err)
- goto err_irq_err;
-
- esp_initialize(esp);
-
- err = scsi_add_host(esp->ehost, NULL);
- if (err) {
- printk(KERN_ERR "ESP: Unable to register adapter\n");
- goto err_irq_dma;
- }
-
- scsi_scan_host(esp->ehost);
-
- dec_esp_platform = esp;
- }
-
- return 0;
-
-err_irq_dma:
- free_irq(dec_interrupt[DEC_IRQ_ASC_DMA], esp->ehost);
-err_irq_err:
- free_irq(dec_interrupt[DEC_IRQ_ASC_ERR], esp->ehost);
-err_irq_merr:
- free_irq(dec_interrupt[DEC_IRQ_ASC_MERR], esp->ehost);
-err_irq:
- free_irq(esp->irq, esp->ehost);
-err_alloc:
- esp_deallocate(esp);
- scsi_host_put(esp->ehost);
- return err;
-}
-
-static int __init dec_esp_probe(struct device *dev)
-{
- struct NCR_ESP *esp;
- resource_size_t start, len;
- int err;
-
- esp = esp_allocate(&dec_esp_template, NULL, 1);
-
- dev_set_drvdata(dev, esp);
-
- start = to_tc_dev(dev)->resource.start;
- len = to_tc_dev(dev)->resource.end - start + 1;
-
- if (!request_mem_region(start, len, dev->bus_id)) {
- printk(KERN_ERR "%s: Unable to reserve MMIO resource\n",
- dev->bus_id);
- err = -EBUSY;
- goto err_alloc;
- }
-
- /* Store base addr into esp struct. */
- esp->slot = start;
-
- esp->dregs = 0;
- esp->eregs = (void *)CKSEG1ADDR(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 = virt_to_phys(pmaz_cmd_buffer);
-
- esp->cfreq = tc_get_speed(to_tc_dev(dev)->bus);
-
- esp->irq = to_tc_dev(dev)->interrupt;
-
- /* 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;
-
- err = request_irq(esp->irq, esp_intr, IRQF_DISABLED, "PMAZ_AA",
- esp->ehost);
- if (err) {
- printk(KERN_ERR "%s: Unable to get IRQ %d\n",
- dev->bus_id, esp->irq);
- goto err_resource;
- }
-
- esp->scsi_id = 7;
- esp->diff = 0;
- esp_initialize(esp);
-
- err = scsi_add_host(esp->ehost, dev);
- if (err) {
- printk(KERN_ERR "%s: Unable to register adapter\n",
- dev->bus_id);
- goto err_irq;
- }
-
- scsi_scan_host(esp->ehost);
-
- return 0;
-
-err_irq:
- free_irq(esp->irq, esp->ehost);
-
-err_resource:
- release_mem_region(start, len);
-
-err_alloc:
- esp_deallocate(esp);
- scsi_host_put(esp->ehost);
- return err;
-}
-
-static void __exit dec_esp_platform_remove(void)
-{
- struct NCR_ESP *esp = dec_esp_platform;
-
- free_irq(esp->irq, esp->ehost);
- esp_deallocate(esp);
- scsi_host_put(esp->ehost);
- dec_esp_platform = NULL;
-}
-
-static void __exit dec_esp_remove(struct device *dev)
-{
- struct NCR_ESP *esp = dev_get_drvdata(dev);
-
- free_irq(esp->irq, esp->ehost);
- esp_deallocate(esp);
- scsi_host_put(esp->ehost);
-}
-
-
-/************************************************************* DMA Functions */
-static irqreturn_t scsi_dma_merr_int(int irq, void *dev_id)
-{
- printk("Got unexpected SCSI DMA Interrupt! < ");
- printk("SCSI_DMA_MEMRDERR ");
- printk(">\n");
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t scsi_dma_err_int(int irq, void *dev_id)
-{
- /* empty */
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t scsi_dma_int(int irq, void *dev_id)
-{
- u32 scsi_next_ptr;
-
- scsi_next_ptr = ioasic_read(IO_REG_SCSI_DMA_P);
-
- /* next page */
- scsi_next_ptr = (((scsi_next_ptr >> 3) + PAGE_SIZE) & PAGE_MASK) << 3;
- ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
- fast_iob();
-
- return IRQ_HANDLED;
-}
-
-static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
-{
- return fifo_count;
-}
-
-static void dma_drain(struct NCR_ESP *esp)
-{
- u32 nw, data0, data1, scsi_data_ptr;
- u16 *p;
-
- nw = ioasic_read(IO_REG_SCSI_SCR);
-
- /*
- * Is there something in the dma buffers left?
- */
- if (nw) {
- scsi_data_ptr = ioasic_read(IO_REG_SCSI_DMA_P) >> 3;
- p = phys_to_virt(scsi_data_ptr);
- switch (nw) {
- case 1:
- data0 = ioasic_read(IO_REG_SCSI_SDR0);
- p[0] = data0 & 0xffff;
- break;
- case 2:
- data0 = ioasic_read(IO_REG_SCSI_SDR0);
- p[0] = data0 & 0xffff;
- p[1] = (data0 >> 16) & 0xffff;
- break;
- case 3:
- data0 = ioasic_read(IO_REG_SCSI_SDR0);
- data1 = ioasic_read(IO_REG_SCSI_SDR1);
- p[0] = data0 & 0xffff;
- p[1] = (data0 >> 16) & 0xffff;
- p[2] = data1 & 0xffff;
- break;
- default:
- printk("Strange: %d words in dma buffer left\n", nw);
- break;
- }
- }
-}
-
-static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd * sp)
-{
- return sp->SCp.this_residual;
-}
-
-static void dma_dump_state(struct NCR_ESP *esp)
-{
-}
-
-static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
-{
- u32 scsi_next_ptr, ioasic_ssr;
- unsigned long flags;
-
- if (vaddress & 3)
- panic("dec_esp.c: unable to handle partial word transfers, yet...");
-
- dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
-
- spin_lock_irqsave(&ioasic_ssr_lock, flags);
-
- fast_mb();
- ioasic_ssr = ioasic_read(IO_REG_SSR);
-
- ioasic_ssr &= ~IO_SSR_SCSI_DMA_EN;
- ioasic_write(IO_REG_SSR, ioasic_ssr);
-
- fast_wmb();
- ioasic_write(IO_REG_SCSI_SCR, 0);
- ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
-
- /* prepare for next page */
- scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
- ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
-
- ioasic_ssr |= (IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
- fast_wmb();
- ioasic_write(IO_REG_SSR, ioasic_ssr);
-
- fast_iob();
- spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
-}
-
-static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
-{
- u32 scsi_next_ptr, ioasic_ssr;
- unsigned long flags;
-
- if (vaddress & 3)
- panic("dec_esp.c: unable to handle partial word transfers, yet...");
-
- dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
-
- spin_lock_irqsave(&ioasic_ssr_lock, flags);
-
- fast_mb();
- ioasic_ssr = ioasic_read(IO_REG_SSR);
-
- ioasic_ssr &= ~(IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
- ioasic_write(IO_REG_SSR, ioasic_ssr);
-
- fast_wmb();
- ioasic_write(IO_REG_SCSI_SCR, 0);
- ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
-
- /* prepare for next page */
- scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
- ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
-
- ioasic_ssr |= IO_SSR_SCSI_DMA_EN;
- fast_wmb();
- ioasic_write(IO_REG_SSR, ioasic_ssr);
-
- fast_iob();
- spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
-}
-
-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)
-{
- /*
- * 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.ptr = (char *)virt_to_phys(sp->request_buffer);
-}
-
-static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp)
-{
- int sz = sp->SCp.buffers_residual;
- struct scatterlist *sg = sp->SCp.buffer;
-
- while (sz >= 0) {
- sg[sz].dma_address = page_to_phys(sg[sz].page) + sg[sz].offset;
- sz--;
- }
- sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
-}
-
-static void dma_advance_sg(struct scsi_cmnd * sp)
-{
- sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
-}
-
-static void pmaz_dma_drain(struct NCR_ESP *esp)
-{
- memcpy(phys_to_virt(esp_virt_buffer),
- (void *)CKSEG1ADDR(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 u32 *dmareg =
- (volatile u32 *)CKSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
-
- if (length > ESP_TGT_DMA_SIZE)
- length = ESP_TGT_DMA_SIZE;
-
- *dmareg = TC_ESP_DMA_ADDR(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 u32 *dmareg =
- (volatile u32 *)CKSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
-
- memcpy((void *)CKSEG1ADDR(esp->slot + DEC_SCSI_SRAM +
- ESP_TGT_DMA_SIZE),
- phys_to_virt(vaddress), length);
-
- wmb();
- *dmareg = TC_ESP_DMAR_WRITE | TC_ESP_DMA_ADDR(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)
-{
- /*
- * 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, struct scsi_cmnd * sp)
-{
- sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
-}
-
-
-#ifdef CONFIG_TC
-static int __init dec_esp_tc_probe(struct device *dev);
-static int __exit dec_esp_tc_remove(struct device *dev);
-
-static const struct tc_device_id dec_esp_tc_table[] = {
- { "DEC ", "PMAZ-AA " },
- { }
-};
-MODULE_DEVICE_TABLE(tc, dec_esp_tc_table);
-
-static struct tc_driver dec_esp_tc_driver = {
- .id_table = dec_esp_tc_table,
- .driver = {
- .name = "dec_esp",
- .bus = &tc_bus_type,
- .probe = dec_esp_tc_probe,
- .remove = __exit_p(dec_esp_tc_remove),
- },
-};
-
-static int __init dec_esp_tc_probe(struct device *dev)
-{
- int status = dec_esp_probe(dev);
- if (!status)
- get_device(dev);
- return status;
-}
-
-static int __exit dec_esp_tc_remove(struct device *dev)
-{
- put_device(dev);
- dec_esp_remove(dev);
- return 0;
-}
-#endif
-
-static int __init dec_esp_init(void)
-{
- int status;
-
- status = tc_register_driver(&dec_esp_tc_driver);
- if (!status)
- dec_esp_platform_probe();
-
- if (nesps) {
- pr_info("ESP: Total of %d ESP hosts found, "
- "%d actually in use.\n", nesps, esps_in_use);
- esps_running = esps_in_use;
- }
-
- return status;
-}
-
-static void __exit dec_esp_exit(void)
-{
- dec_esp_platform_remove();
- tc_unregister_driver(&dec_esp_tc_driver);
-}
-
-
-module_init(dec_esp_init);
-module_exit(dec_esp_exit);
projects / openwrt / staging / blogic.git / commitdiff