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Diffstat (limited to 'drivers/scsi/jazz_esp.c')
-rw-r--r--drivers/scsi/jazz_esp.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/scsi/jazz_esp.c b/drivers/scsi/jazz_esp.c
new file mode 100644
index 000000000..4cd3b428f
--- /dev/null
+++ b/drivers/scsi/jazz_esp.c
@@ -0,0 +1,271 @@
+/*
+ * jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
+ *
+ * Copyright (C) 1997 Thomas Boegndoerfer (tsbogend@alpha.franken.de)
+ *
+ * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/malloc.h>
+#include <linux/blk.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+
+#include "scsi.h"
+#include "hosts.h"
+#include "esp.h"
+#include "jazz_esp.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 Sparc_ESP *esp, int fifo_count);
+static int dma_can_transfer(struct Sparc_ESP *esp, Scsi_Cmnd *sp);
+static void dma_dump_state(struct Sparc_ESP *esp);
+static void dma_init_read(struct Sparc_ESP *esp, char *vaddress, int length);
+static void dma_init_write(struct Sparc_ESP *esp, char *vaddress, int length);
+static void dma_ints_off(struct Sparc_ESP *esp);
+static void dma_ints_on(struct Sparc_ESP *esp);
+static int dma_irq_p(struct Sparc_ESP *esp);
+static int dma_ports_p(struct Sparc_ESP *esp);
+static void dma_setup(struct Sparc_ESP *esp, char *addr, int count, int write);
+static void dma_mmu_get_scsi_one (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
+static void dma_mmu_get_scsi_sgl (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
+static void dma_mmu_release_scsi_one (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
+static void dma_mmu_release_scsi_sgl (struct Sparc_ESP *esp, Scsi_Cmnd *sp);
+static void dma_advance_sg (Scsi_Cmnd *sp);
+static void dma_led_off(struct Sparc_ESP *);
+static void dma_led_on(struct Sparc_ESP *);
+
+
+volatile unsigned char cmd_buffer[16];
+ /* This is where all commands are put
+ * before they are trasfered to the ESP chip
+ * via PIO.
+ */
+
+/***************************************************************** Detection */
+int jazz_esp_detect(Scsi_Host_Template *tpnt)
+{
+ struct Sparc_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;
+
+ esp->irq = JAZZ_SCSI_IRQ;
+ request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI", esp_intr);
+
+ /*
+ * FIXME, look if the scsi id is availabe from NVRAM
+ */
+ esp->scsi_id = 7;
+
+ /* Check for differential SCSI-bus */
+ /* What is this stuff? */
+ esp->diff = 0;
+
+ esp_initialize(esp);
+
+ printk("\nESP: 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 Sparc_ESP *esp, int fifo_count)
+{
+ return fifo_count;
+}
+
+static int dma_can_transfer(struct Sparc_ESP *esp, 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 Sparc_ESP *esp)
+{
+
+ ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
+ esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_resdiue((int)esp->dregs)));
+}
+
+static void dma_init_read(struct Sparc_ESP *esp, char *vaddress, int length)
+{
+ flush_cache_all();
+ vdma_disable ((int)esp->dregs);
+ vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
+ vdma_set_addr ((int)esp->dregs, (long)virt_to_bus(vaddress));
+ vdma_set_count ((int)esp->dregs, length);
+ vdma_enable ((int)esp->dregs);
+}
+
+static void dma_init_write(struct Sparc_ESP *esp, char *vaddress, int length)
+{
+ flush_cache_all();
+ vdma_disable ((int)esp->dregs);
+ vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
+ vdma_set_addr ((int)esp->dregs, (long)virt_to_bus(vaddress));
+ vdma_set_count ((int)esp->dregs, length);
+ vdma_enable ((int)esp->dregs);
+}
+
+static void dma_ints_off(struct Sparc_ESP *esp)
+{
+ disable_irq(esp->irq);
+}
+
+static void dma_ints_on(struct Sparc_ESP *esp)
+{
+ enable_irq(esp->irq);
+}
+
+static int dma_irq_p(struct Sparc_ESP *esp)
+{
+ return (esp->eregs->esp_status & ESP_STAT_INTR);
+}
+
+static int dma_ports_p(struct Sparc_ESP *esp)
+{
+ int enable = vdma_get_enable((int)esp->dregs);
+
+ return (enable & R4030_CHNL_ENABLE);
+}
+
+static void dma_setup(struct Sparc_ESP *esp, char *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 Sparc_ESP *esp, Scsi_Cmnd *sp)
+{
+ sp->SCp.have_data_in = vdma_alloc(PHYSADDR(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 Sparc_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 = vdma_alloc(PHYSADDR(sg[sz].addr), sg[sz].len);
+ sz--;
+ }
+ sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
+}
+
+static void dma_mmu_release_scsi_one (struct Sparc_ESP *esp, Scsi_Cmnd *sp)
+{
+ vdma_free(sp->SCp.have_data_in);
+}
+
+static void dma_mmu_release_scsi_sgl (struct Sparc_ESP *esp, Scsi_Cmnd *sp)
+{
+ int sz = sp->use_sg - 1;
+ struct mmu_sglist *sg = (struct mmu_sglist *)sp->buffer;
+
+ while(sz >= 0) {
+ vdma_free(sg[sz].dvma_addr);
+ sz--;
+ }
+}
+
+static void dma_advance_sg (Scsi_Cmnd *sp)
+{
+ sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
+}
+
+#define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
+
+static void dma_led_off(struct Sparc_ESP *esp)
+{
+#if 0
+ *(unsigned char *)JAZZ_HDC_LED = 0;
+#endif
+}
+
+static void dma_led_on(struct Sparc_ESP *esp)
+{
+#if 0
+ *(unsigned char *)JAZZ_HDC_LED = 1;
+#endif
+}
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