drivers/scsi/cyberstormII.c - linux - Git at Google

 /* cyberstormII.c: Driver for CyberStorm SCSI Mk II
  *
  * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
  *
  * This driver is based on cyberstorm.c
  */

 /* TODO:
  *
  * 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>

 /* The controller registers can be found in the Z2 config area at these
  * offsets:
  */
 #define CYBERII_ESP_ADDR 0x1ff03
 #define CYBERII_DMA_ADDR 0x1ff43


 /* The CyberStorm II DMA interface */
 struct cyberII_dma_registers {
 	volatile unsigned char cond_reg;        /* DMA cond    (ro)  [0x000] */
 #define ctrl_reg  cond_reg			/* DMA control (wo)  [0x000] */
 	unsigned char dmapad4[0x3f];
 	volatile unsigned char dma_addr0;	/* DMA address (MSB) [0x040] */
 	unsigned char dmapad1[3];
 	volatile unsigned char dma_addr1;	/* DMA address       [0x044] */
 	unsigned char dmapad2[3];
 	volatile unsigned char dma_addr2;	/* DMA address       [0x048] */
 	unsigned char dmapad3[3];
 	volatile unsigned char dma_addr3;	/* DMA address (LSB) [0x04c] */
 };

 /* DMA control bits */
 #define CYBERII_DMA_LED    0x02	/* HD led control 1 = on */

 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 addr, 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_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 volatile unsigned char cmd_buffer[16];
 				/* This is where all commands are put
 				 * before they are transferred to the ESP chip
 				 * via PIO.
 				 */

 /***************************************************************** Detection */
 int __init cyberII_esp_detect(Scsi_Host_Template *tpnt)
 {
 	struct NCR_ESP *esp;
 	struct zorro_dev *z = NULL;
 	unsigned long address;
 	struct ESP_regs *eregs;

 	if ((z = zorro_find_device(ZORRO_PROD_PHASE5_CYBERSTORM_MK_II, z))) {
 	    unsigned long board = z->resource.start;
 	    if (request_mem_region(board+CYBERII_ESP_ADDR,
 				   sizeof(struct ESP_regs), "NCR53C9x")) {
 		/* Do some magic to figure out if the CyberStorm Mk II
 		 * is equipped with a SCSI controller
 		 */
 		address = (unsigned long)ZTWO_VADDR(board);
 		eregs = (struct ESP_regs *)(address + CYBERII_ESP_ADDR);

 		esp = esp_allocate(tpnt, (void *)board+CYBERII_ESP_ADDR);

 		esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE | 7));
 		udelay(5);
 		if(esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE | 7)) {
 			esp_deallocate(esp);
 			scsi_unregister(esp->ehost);
 			release_mem_region(board+CYBERII_ESP_ADDR,
 					   sizeof(struct ESP_regs));
 			return 0; /* Bail out if address did not hold data */
 		}

 		/* 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_led_on = &dma_led_on;
 		esp->dma_led_off = &dma_led_off;
 		esp->dma_poll = 0;
 		esp->dma_reset = 0;

 		/* SCSI chip speed */
 		esp->cfreq = 40000000;

 		/* The DMA registers on the CyberStorm are mapped
 		 * relative to the device (i.e. in the same Zorro
 		 * I/O block).
 		 */
 		esp->dregs = (void *)(address + CYBERII_DMA_ADDR);

 		/* ESP register base */
 		esp->eregs = eregs;

 		/* Set the command buffer */
 		esp->esp_command = cmd_buffer;
 		esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);

 		esp->irq = IRQ_AMIGA_PORTS;
 		request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
 			    "CyberStorm SCSI Mk II", esp->ehost);

 		/* Figure out our scsi ID on the bus */
 		esp->scsi_id = 7;

 		/* We don't have a differential SCSI-bus. */
 		esp->diff = 0;

 		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;
 }

 /************************************************************* DMA Functions */
 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 {
 	/* Since the CyberStorm 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)
 {
 	/* I don't think there's any limit on the CyberDMA. So we use what
 	 * the ESP chip can handle (24 bit).
 	 */
 	unsigned long sz = sp->SCp.this_residual;
 	if(sz > 0x1000000)
 		sz = 0x1000000;
 	return sz;
 }

 static void dma_dump_state(struct NCR_ESP *esp)
 {
 	ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
 		esp->esp_id, ((struct cyberII_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 cyberII_dma_registers *dregs =
 		(struct cyberII_dma_registers *) esp->dregs;

 	cache_clear(addr, length);

 	addr &= ~(1);
 	dregs->dma_addr0 = (addr >> 24) & 0xff;
 	dregs->dma_addr1 = (addr >> 16) & 0xff;
 	dregs->dma_addr2 = (addr >>  8) & 0xff;
 	dregs->dma_addr3 = (addr      ) & 0xff;
 }

 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
 {
 	struct cyberII_dma_registers *dregs =
 		(struct cyberII_dma_registers *) esp->dregs;

 	cache_push(addr, length);

 	addr |= 1;
 	dregs->dma_addr0 = (addr >> 24) & 0xff;
 	dregs->dma_addr1 = (addr >> 16) & 0xff;
 	dregs->dma_addr2 = (addr >>  8) & 0xff;
 	dregs->dma_addr3 = (addr      ) & 0xff;
 }

 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 int dma_irq_p(struct NCR_ESP *esp)
 {
 	/* It's important to check the DMA IRQ bit in the correct way! */
 	return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 }

 static void dma_led_off(struct NCR_ESP *esp)
 {
 	((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
 }

 static void dma_led_on(struct NCR_ESP *esp)
 {
 	((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg |= CYBERII_DMA_LED;
 }

 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 cyberII_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-cyberstormII",
 	.proc_info		= esp_proc_info,
 	.name			= "CyberStorm Mk II SCSI",
 	.detect			= cyberII_esp_detect,
 	.slave_alloc		= esp_slave_alloc,
 	.slave_destroy		= esp_slave_destroy,
 	.release		= cyberII_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");
	/* cyberstormII.c: Driver for CyberStorm SCSI Mk II
	*
	* Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
	*
	* This driver is based on cyberstorm.c
	*/

	/* TODO:
	*
	* 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>

	/* The controller registers can be found in the Z2 config area at these
	* offsets:
	*/
	#define CYBERII_ESP_ADDR 0x1ff03
	#define CYBERII_DMA_ADDR 0x1ff43


	/* The CyberStorm II DMA interface */
	struct cyberII_dma_registers {
	volatile unsigned char cond_reg; /* DMA cond (ro) [0x000] */
	#define ctrl_reg cond_reg /* DMA control (wo) [0x000] */
	unsigned char dmapad4[0x3f];
	volatile unsigned char dma_addr0; /* DMA address (MSB) [0x040] */
	unsigned char dmapad1[3];
	volatile unsigned char dma_addr1; /* DMA address [0x044] */
	unsigned char dmapad2[3];
	volatile unsigned char dma_addr2; /* DMA address [0x048] */
	unsigned char dmapad3[3];
	volatile unsigned char dma_addr3; /* DMA address (LSB) [0x04c] */
	};

	/* DMA control bits */
	#define CYBERII_DMA_LED 0x02 /* HD led control 1 = on */

	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 addr, 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_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 volatile unsigned char cmd_buffer[16];
	/* This is where all commands are put
	* before they are transferred to the ESP chip
	* via PIO.
	*/

	/***************************************************************** Detection */
	int __init cyberII_esp_detect(Scsi_Host_Template *tpnt)
	{
	struct NCR_ESP *esp;
	struct zorro_dev *z = NULL;
	unsigned long address;
	struct ESP_regs *eregs;

	if ((z = zorro_find_device(ZORRO_PROD_PHASE5_CYBERSTORM_MK_II, z))) {
	unsigned long board = z->resource.start;
	if (request_mem_region(board+CYBERII_ESP_ADDR,
	sizeof(struct ESP_regs), "NCR53C9x")) {
	/* Do some magic to figure out if the CyberStorm Mk II
	* is equipped with a SCSI controller
	*/
	address = (unsigned long)ZTWO_VADDR(board);
	eregs = (struct ESP_regs *)(address + CYBERII_ESP_ADDR);

	esp = esp_allocate(tpnt, (void *)board+CYBERII_ESP_ADDR);

	esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE \| 7));
	udelay(5);
	if(esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE \| 7)) {
	esp_deallocate(esp);
	scsi_unregister(esp->ehost);
	release_mem_region(board+CYBERII_ESP_ADDR,
	sizeof(struct ESP_regs));
	return 0; /* Bail out if address did not hold data */
	}

	/* 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_led_on = &dma_led_on;
	esp->dma_led_off = &dma_led_off;
	esp->dma_poll = 0;
	esp->dma_reset = 0;

	/* SCSI chip speed */
	esp->cfreq = 40000000;

	/* The DMA registers on the CyberStorm are mapped
	* relative to the device (i.e. in the same Zorro
	* I/O block).
	*/
	esp->dregs = (void *)(address + CYBERII_DMA_ADDR);

	/* ESP register base */
	esp->eregs = eregs;

	/* Set the command buffer */
	esp->esp_command = cmd_buffer;
	esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);

	esp->irq = IRQ_AMIGA_PORTS;
	request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
	"CyberStorm SCSI Mk II", esp->ehost);

	/* Figure out our scsi ID on the bus */
	esp->scsi_id = 7;

	/* We don't have a differential SCSI-bus. */
	esp->diff = 0;

	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;
	}

	/************************************************************* DMA Functions */
	static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
	{
	/* Since the CyberStorm 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)
	{
	/* I don't think there's any limit on the CyberDMA. So we use what
	* the ESP chip can handle (24 bit).
	*/
	unsigned long sz = sp->SCp.this_residual;
	if(sz > 0x1000000)
	sz = 0x1000000;
	return sz;
	}

	static void dma_dump_state(struct NCR_ESP *esp)
	{
	ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
	esp->esp_id, ((struct cyberII_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 cyberII_dma_registers *dregs =
	(struct cyberII_dma_registers *) esp->dregs;

	cache_clear(addr, length);

	addr &= ~(1);
	dregs->dma_addr0 = (addr >> 24) & 0xff;
	dregs->dma_addr1 = (addr >> 16) & 0xff;
	dregs->dma_addr2 = (addr >> 8) & 0xff;
	dregs->dma_addr3 = (addr ) & 0xff;
	}

	static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
	{
	struct cyberII_dma_registers *dregs =
	(struct cyberII_dma_registers *) esp->dregs;

	cache_push(addr, length);

	addr \|= 1;
	dregs->dma_addr0 = (addr >> 24) & 0xff;
	dregs->dma_addr1 = (addr >> 16) & 0xff;
	dregs->dma_addr2 = (addr >> 8) & 0xff;
	dregs->dma_addr3 = (addr ) & 0xff;
	}

	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 int dma_irq_p(struct NCR_ESP *esp)
	{
	/* It's important to check the DMA IRQ bit in the correct way! */
	return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
	}

	static void dma_led_off(struct NCR_ESP *esp)
	{
	((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
	}

	static void dma_led_on(struct NCR_ESP *esp)
	{
	((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg \|= CYBERII_DMA_LED;
	}

	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 cyberII_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-cyberstormII",
	.proc_info = esp_proc_info,
	.name = "CyberStorm Mk II SCSI",
	.detect = cyberII_esp_detect,
	.slave_alloc = esp_slave_alloc,
	.slave_destroy = esp_slave_destroy,
	.release = cyberII_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");