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path: root/drivers/scsi/fastlane.c
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Diffstat (limited to 'drivers/scsi/fastlane.c')
-rw-r--r--drivers/scsi/fastlane.c421
1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/scsi/fastlane.c b/drivers/scsi/fastlane.c
new file mode 100644
index 00000000000..ae47612b361
--- /dev/null
+++ b/drivers/scsi/fastlane.c
@@ -0,0 +1,421 @@
+/* fastlane.c: Driver for Phase5's Fastlane SCSI Controller.
+ *
+ * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
+ *
+ * This driver is based on the CyberStorm driver, hence the occasional
+ * reference to CyberStorm.
+ *
+ * Betatesting & crucial adjustments by
+ * Patrik Rak (prak3264@ss1000.ms.mff.cuni.cz)
+ *
+ */
+
+/* TODO:
+ *
+ * o According to the doc from laire, it is required to reset the DMA when
+ * the transfer is done. ATM we reset DMA just before every new
+ * dma_init_(read|write).
+ *
+ * 1) Figure out how to make a cleaner merge with the sparc driver with regard
+ * to the caches and the Sparc MMU mapping.
+ * 2) Make as few routines required outside the generic driver. A lot of the
+ * routines in this file used to be inline!
+ */
+
+#include <linux/module.h>
+
+#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 <linux/interrupt.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "NCR53C9x.h"
+
+#include <linux/zorro.h>
+#include <asm/irq.h>
+
+#include <asm/amigaints.h>
+#include <asm/amigahw.h>
+
+#include <asm/pgtable.h>
+
+/* Such day has just come... */
+#if 0
+/* Let this defined unless you really need to enable DMA IRQ one day */
+#define NODMAIRQ
+#endif
+
+/* The controller registers can be found in the Z2 config area at these
+ * offsets:
+ */
+#define FASTLANE_ESP_ADDR 0x1000001
+#define FASTLANE_DMA_ADDR 0x1000041
+
+
+/* The Fastlane DMA interface */
+struct fastlane_dma_registers {
+ volatile unsigned char cond_reg; /* DMA status (ro) [0x0000] */
+#define ctrl_reg cond_reg /* DMA control (wo) [0x0000] */
+ unsigned char dmapad1[0x3f];
+ volatile unsigned char clear_strobe; /* DMA clear (wo) [0x0040] */
+};
+
+
+/* DMA status bits */
+#define FASTLANE_DMA_MINT 0x80
+#define FASTLANE_DMA_IACT 0x40
+#define FASTLANE_DMA_CREQ 0x20
+
+/* DMA control bits */
+#define FASTLANE_DMA_FCODE 0xa0
+#define FASTLANE_DMA_MASK 0xf3
+#define FASTLANE_DMA_LED 0x10 /* HD led control 1 = on */
+#define FASTLANE_DMA_WRITE 0x08 /* 1 = write */
+#define FASTLANE_DMA_ENABLE 0x04 /* Enable DMA */
+#define FASTLANE_DMA_EDI 0x02 /* Enable DMA IRQ ? */
+#define FASTLANE_DMA_ESI 0x01 /* Enable SCSI IRQ */
+
+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_dump_state(struct NCR_ESP *esp);
+static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
+static void dma_init_write(struct NCR_ESP *esp, __u32 vaddr, 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_irq_exit(struct NCR_ESP *esp);
+static void dma_led_off(struct NCR_ESP *esp);
+static void dma_led_on(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 unsigned char ctrl_data = 0; /* Keep backup of the stuff written
+ * to ctrl_reg. Always write a copy
+ * to this register when writing to
+ * the hardware register!
+ */
+
+static volatile unsigned char cmd_buffer[16];
+ /* This is where all commands are put
+ * before they are transferred to the ESP chip
+ * via PIO.
+ */
+
+static inline void dma_clear(struct NCR_ESP *esp)
+{
+ struct fastlane_dma_registers *dregs =
+ (struct fastlane_dma_registers *) (esp->dregs);
+ unsigned long *t;
+
+ ctrl_data = (ctrl_data & FASTLANE_DMA_MASK);
+ dregs->ctrl_reg = ctrl_data;
+
+ t = (unsigned long *)(esp->edev);
+
+ dregs->clear_strobe = 0;
+ *t = 0 ;
+}
+
+/***************************************************************** Detection */
+int __init fastlane_esp_detect(Scsi_Host_Template *tpnt)
+{
+ struct NCR_ESP *esp;
+ struct zorro_dev *z = NULL;
+ unsigned long address;
+
+ if ((z = zorro_find_device(ZORRO_PROD_PHASE5_BLIZZARD_1230_II_FASTLANE_Z3_CYBERSCSI_CYBERSTORM060, z))) {
+ unsigned long board = z->resource.start;
+ if (request_mem_region(board+FASTLANE_ESP_ADDR,
+ sizeof(struct ESP_regs), "NCR53C9x")) {
+ /* Check if this is really a fastlane controller. The problem
+ * is that also the cyberstorm and blizzard controllers use
+ * this ID value. Fortunately only Fastlane maps in Z3 space
+ */
+ if (board < 0x1000000) {
+ goto err_release;
+ }
+ esp = esp_allocate(tpnt, (void *)board+FASTLANE_ESP_ADDR);
+
+ /* 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 = &dma_irq_exit;
+ esp->dma_led_on = &dma_led_on;
+ esp->dma_led_off = &dma_led_off;
+ esp->dma_poll = 0;
+ esp->dma_reset = 0;
+
+ /* Initialize the portBits (enable IRQs) */
+ ctrl_data = (FASTLANE_DMA_FCODE |
+#ifndef NODMAIRQ
+ FASTLANE_DMA_EDI |
+#endif
+ FASTLANE_DMA_ESI);
+
+
+ /* SCSI chip clock */
+ esp->cfreq = 40000000;
+
+
+ /* Map the physical address space into virtual kernel space */
+ address = (unsigned long)
+ z_ioremap(board, z->resource.end-board+1);
+
+ if(!address){
+ printk("Could not remap Fastlane controller memory!");
+ goto err_unregister;
+ }
+
+
+ /* The DMA registers on the Fastlane are mapped
+ * relative to the device (i.e. in the same Zorro
+ * I/O block).
+ */
+ esp->dregs = (void *)(address + FASTLANE_DMA_ADDR);
+
+ /* ESP register base */
+ esp->eregs = (struct ESP_regs *)(address + FASTLANE_ESP_ADDR);
+
+ /* Board base */
+ esp->edev = (void *) address;
+
+ /* Set the command buffer */
+ esp->esp_command = cmd_buffer;
+ esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);
+
+ esp->irq = IRQ_AMIGA_PORTS;
+ esp->slot = board+FASTLANE_ESP_ADDR;
+ if (request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
+ "Fastlane SCSI", esp->ehost)) {
+ printk(KERN_WARNING "Fastlane: Could not get IRQ%d, aborting.\n", IRQ_AMIGA_PORTS);
+ goto err_unmap;
+ }
+
+ /* Controller ID */
+ esp->scsi_id = 7;
+
+ /* We don't have a differential SCSI-bus. */
+ esp->diff = 0;
+
+ dma_clear(esp);
+ 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;
+
+ err_unmap:
+ z_iounmap((void *)address);
+ err_unregister:
+ scsi_unregister (esp->ehost);
+ err_release:
+ release_mem_region(z->resource.start+FASTLANE_ESP_ADDR,
+ sizeof(struct ESP_regs));
+ return 0;
+}
+
+
+/************************************************************* DMA Functions */
+static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
+{
+ /* Since the Fastlane DMA is fully dedicated to the ESP chip,
+ * the number of bytes sent (to the ESP chip) equals the number
+ * of bytes in the FIFO - there is no buffering in the DMA controller.
+ * XXXX Do I read this right? It is from host to ESP, right?
+ */
+ return fifo_count;
+}
+
+static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+ unsigned long sz = sp->SCp.this_residual;
+ if(sz > 0xfffc)
+ sz = 0xfffc;
+ return sz;
+}
+
+static void dma_dump_state(struct NCR_ESP *esp)
+{
+ ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
+ esp->esp_id, ((struct fastlane_dma_registers *)
+ (esp->dregs))->cond_reg));
+ ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
+ custom.intreqr, custom.intenar));
+}
+
+static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
+{
+ struct fastlane_dma_registers *dregs =
+ (struct fastlane_dma_registers *) (esp->dregs);
+ unsigned long *t;
+
+ cache_clear(addr, length);
+
+ dma_clear(esp);
+
+ t = (unsigned long *)((addr & 0x00ffffff) + esp->edev);
+
+ dregs->clear_strobe = 0;
+ *t = addr;
+
+ ctrl_data = (ctrl_data & FASTLANE_DMA_MASK) | FASTLANE_DMA_ENABLE;
+ dregs->ctrl_reg = ctrl_data;
+}
+
+static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
+{
+ struct fastlane_dma_registers *dregs =
+ (struct fastlane_dma_registers *) (esp->dregs);
+ unsigned long *t;
+
+ cache_push(addr, length);
+
+ dma_clear(esp);
+
+ t = (unsigned long *)((addr & 0x00ffffff) + (esp->edev));
+
+ dregs->clear_strobe = 0;
+ *t = addr;
+
+ ctrl_data = ((ctrl_data & FASTLANE_DMA_MASK) |
+ FASTLANE_DMA_ENABLE |
+ FASTLANE_DMA_WRITE);
+ dregs->ctrl_reg = ctrl_data;
+}
+
+
+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 void dma_irq_exit(struct NCR_ESP *esp)
+{
+ struct fastlane_dma_registers *dregs =
+ (struct fastlane_dma_registers *) (esp->dregs);
+
+ dregs->ctrl_reg = ctrl_data & ~(FASTLANE_DMA_EDI|FASTLANE_DMA_ESI);
+#ifdef __mc68000__
+ nop();
+#endif
+ dregs->ctrl_reg = ctrl_data;
+}
+
+static int dma_irq_p(struct NCR_ESP *esp)
+{
+ struct fastlane_dma_registers *dregs =
+ (struct fastlane_dma_registers *) (esp->dregs);
+ unsigned char dma_status;
+
+ dma_status = dregs->cond_reg;
+
+ if(dma_status & FASTLANE_DMA_IACT)
+ return 0; /* not our IRQ */
+
+ /* Return non-zero if ESP requested IRQ */
+ return (
+#ifndef NODMAIRQ
+ (dma_status & FASTLANE_DMA_CREQ) &&
+#endif
+ (!(dma_status & FASTLANE_DMA_MINT)) &&
+ (esp_read(((struct ESP_regs *) (esp->eregs))->esp_status) & ESP_STAT_INTR));
+}
+
+static void dma_led_off(struct NCR_ESP *esp)
+{
+ ctrl_data &= ~FASTLANE_DMA_LED;
+ ((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
+}
+
+static void dma_led_on(struct NCR_ESP *esp)
+{
+ ctrl_data |= FASTLANE_DMA_LED;
+ ((struct fastlane_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
+}
+
+static int dma_ports_p(struct NCR_ESP *esp)
+{
+ return ((custom.intenar) & IF_PORTS);
+}
+
+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);
+ }
+}
+
+#define HOSTS_C
+
+int fastlane_esp_release(struct Scsi_Host *instance)
+{
+#ifdef MODULE
+ unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
+ esp_deallocate((struct NCR_ESP *)instance->hostdata);
+ esp_release();
+ release_mem_region(address, sizeof(struct ESP_regs));
+ free_irq(IRQ_AMIGA_PORTS, esp_intr);
+#endif
+ return 1;
+}
+
+
+static Scsi_Host_Template driver_template = {
+ .proc_name = "esp-fastlane",
+ .proc_info = esp_proc_info,
+ .name = "Fastlane SCSI",
+ .detect = fastlane_esp_detect,
+ .slave_alloc = esp_slave_alloc,
+ .slave_destroy = esp_slave_destroy,
+ .release = fastlane_esp_release,
+ .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 = ENABLE_CLUSTERING
+};
+
+#include "scsi_module.c"
+
+MODULE_LICENSE("GPL");
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