drivers/scsi/jazz_esp.c - linux/kernel/git/mellanox/linux - Git at Google

 /*
  * jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
  *
  * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  *
  * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
  */

 #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 "scsi.h"
 #include <scsi/scsi_host.h>
 #include "NCR53C9x.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 NCR_ESP *esp, int fifo_count);
 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_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
 static void dma_advance_sg (struct scsi_cmnd *sp);
 static void dma_led_off(struct NCR_ESP *);
 static void dma_led_on(struct NCR_ESP *);


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

 int jazz_esp_detect(struct scsi_host_template *tpnt);
 static int jazz_esp_release(struct Scsi_Host *shost)
 {
 	if (shost->irq)
 		free_irq(shost->irq, NULL);
 	if (shost->dma_channel != 0xff)
 		free_dma(shost->dma_channel);
 	if (shost->io_port && shost->n_io_port)
 		release_region(shost->io_port, shost->n_io_port);
 	scsi_unregister(shost);
 	return 0;
 }

 static struct scsi_host_template driver_template = {
 	.proc_name		= "jazz_esp",
 	.proc_info		= &esp_proc_info,
 	.name			= "ESP 100/100a/200",
 	.detect			= jazz_esp_detect,
 	.slave_alloc		= esp_slave_alloc,
 	.slave_destroy		= esp_slave_destroy,
 	.release		= jazz_esp_release,
 	.info			= esp_info,
 	.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		= DISABLE_CLUSTERING,
 };

 #include "scsi_module.c"

 /***************************************************************** Detection */
 static int jazz_esp_detect(struct scsi_host_template *tpnt)
 {
     struct NCR_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;

 	/* get virtual dma address for command buffer */
 	esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));

 	esp->irq = JAZZ_SCSI_IRQ;
 	request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
 	            esp->ehost);

 	/*
 	 * FIXME, look if the scsi id is available from NVRAM
 	 */
 	esp->scsi_id = 7;

 	/* Check for differential SCSI-bus */
 	/* What is this stuff? */
 	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)
 {
     return fifo_count;
 }

 static int dma_can_transfer(struct NCR_ESP *esp, struct 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 NCR_ESP *esp)
 {

     ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
 	    esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
 }

 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
 {
     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
     vdma_disable ((int)esp->dregs);
     vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
     vdma_set_addr ((int)esp->dregs, vaddress);
     vdma_set_count ((int)esp->dregs, length);
     vdma_enable ((int)esp->dregs);
 }

 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
 {
     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
     vdma_disable ((int)esp->dregs);
     vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
     vdma_set_addr ((int)esp->dregs, vaddress);
     vdma_set_count ((int)esp->dregs, length);
     vdma_enable ((int)esp->dregs);
 }

 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)
 {
     return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 }

 static int dma_ports_p(struct NCR_ESP *esp)
 {
     int enable = vdma_get_enable((int)esp->dregs);

     return (enable & R4030_CHNL_ENABLE);
 }

 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);
     }
 }

 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 {
     sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(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 NCR_ESP *esp, struct scsi_cmnd *sp)
 {
     int sz = sp->SCp.buffers_residual;
     struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;

     while (sz >= 0) {
 	sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
 	sz--;
     }
     sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
 }

 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 {
     vdma_free(sp->SCp.have_data_in);
 }

 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 {
     int sz = sp->use_sg - 1;
     struct scatterlist *sg = (struct scatterlist *)sp->buffer;

     while(sz >= 0) {
 	vdma_free(sg[sz].dma_address);
 	sz--;
     }
 }

 static void dma_advance_sg (struct scsi_cmnd *sp)
 {
     sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
 }

 #define JAZZ_HDC_LED   0xe000d100 /* FIXME, find correct address */

 static void dma_led_off(struct NCR_ESP *esp)
 {
 #if 0
     *(unsigned char *)JAZZ_HDC_LED = 0;
 #endif
 }

 static void dma_led_on(struct NCR_ESP *esp)
 {
 #if 0
     *(unsigned char *)JAZZ_HDC_LED = 1;
 #endif
 }

 static struct scsi_host_template driver_template = {
 	.proc_name		= "jazz_esp",
 	.proc_info		= esp_proc_info,
 	.name			= "ESP 100/100a/200",
 	.detect			= jazz_esp_detect,
 	.slave_alloc		= esp_slave_alloc,
 	.slave_destroy		= esp_slave_destroy,
 	.release		= jazz_esp_release,
 	.info			= esp_info,
 	.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		= DISABLE_CLUSTERING,
 };
 #include "scsi_module.c"
	/*
	* jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
	*
	* Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
	*
	* jazz_esp is based on David S. Miller's ESP driver and cyber_esp
	*/

	#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 "scsi.h"
	#include <scsi/scsi_host.h>
	#include "NCR53C9x.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 NCR_ESP *esp, int fifo_count);
	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_mmu_release_scsi_one (struct NCR_ESP esp, struct scsi_cmnd sp);
	static void dma_mmu_release_scsi_sgl (struct NCR_ESP esp, struct scsi_cmnd sp);
	static void dma_advance_sg (struct scsi_cmnd *sp);
	static void dma_led_off(struct NCR_ESP *);
	static void dma_led_on(struct NCR_ESP *);


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

	int jazz_esp_detect(struct scsi_host_template *tpnt);
	static int jazz_esp_release(struct Scsi_Host *shost)
	{
	if (shost->irq)
	free_irq(shost->irq, NULL);
	if (shost->dma_channel != 0xff)
	free_dma(shost->dma_channel);
	if (shost->io_port && shost->n_io_port)
	release_region(shost->io_port, shost->n_io_port);
	scsi_unregister(shost);
	return 0;
	}

	static struct scsi_host_template driver_template = {
	.proc_name = "jazz_esp",
	.proc_info = &esp_proc_info,
	.name = "ESP 100/100a/200",
	.detect = jazz_esp_detect,
	.slave_alloc = esp_slave_alloc,
	.slave_destroy = esp_slave_destroy,
	.release = jazz_esp_release,
	.info = esp_info,
	.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 = DISABLE_CLUSTERING,
	};

	#include "scsi_module.c"

	/***************************************************************** Detection */
	static int jazz_esp_detect(struct scsi_host_template *tpnt)
	{
	struct NCR_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;

	/* get virtual dma address for command buffer */
	esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));

	esp->irq = JAZZ_SCSI_IRQ;
	request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
	esp->ehost);

	/*
	* FIXME, look if the scsi id is available from NVRAM
	*/
	esp->scsi_id = 7;

	/* Check for differential SCSI-bus */
	/* What is this stuff? */
	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)
	{
	return fifo_count;
	}

	static int dma_can_transfer(struct NCR_ESP esp, struct 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 NCR_ESP *esp)
	{

	ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
	esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
	}

	static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
	{
	dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
	vdma_disable ((int)esp->dregs);
	vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
	vdma_set_addr ((int)esp->dregs, vaddress);
	vdma_set_count ((int)esp->dregs, length);
	vdma_enable ((int)esp->dregs);
	}

	static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
	{
	dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
	vdma_disable ((int)esp->dregs);
	vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
	vdma_set_addr ((int)esp->dregs, vaddress);
	vdma_set_count ((int)esp->dregs, length);
	vdma_enable ((int)esp->dregs);
	}

	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)
	{
	return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
	}

	static int dma_ports_p(struct NCR_ESP *esp)
	{
	int enable = vdma_get_enable((int)esp->dregs);

	return (enable & R4030_CHNL_ENABLE);
	}

	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);
	}
	}

	static void dma_mmu_get_scsi_one (struct NCR_ESP esp, struct scsi_cmnd sp)
	{
	sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(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 NCR_ESP esp, struct scsi_cmnd sp)
	{
	int sz = sp->SCp.buffers_residual;
	struct scatterlist sg = (struct scatterlist ) sp->SCp.buffer;

	while (sz >= 0) {
	sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
	sz--;
	}
	sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
	}

	static void dma_mmu_release_scsi_one (struct NCR_ESP esp, struct scsi_cmnd sp)
	{
	vdma_free(sp->SCp.have_data_in);
	}

	static void dma_mmu_release_scsi_sgl (struct NCR_ESP esp, struct scsi_cmnd sp)
	{
	int sz = sp->use_sg - 1;
	struct scatterlist sg = (struct scatterlist )sp->buffer;

	while(sz >= 0) {
	vdma_free(sg[sz].dma_address);
	sz--;
	}
	}

	static void dma_advance_sg (struct scsi_cmnd *sp)
	{
	sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
	}

	#define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */

	static void dma_led_off(struct NCR_ESP *esp)
	{
	#if 0
	(unsigned char )JAZZ_HDC_LED = 0;
	#endif
	}

	static void dma_led_on(struct NCR_ESP *esp)
	{
	#if 0
	(unsigned char )JAZZ_HDC_LED = 1;
	#endif
	}

	static struct scsi_host_template driver_template = {
	.proc_name = "jazz_esp",
	.proc_info = esp_proc_info,
	.name = "ESP 100/100a/200",
	.detect = jazz_esp_detect,
	.slave_alloc = esp_slave_alloc,
	.slave_destroy = esp_slave_destroy,
	.release = jazz_esp_release,
	.info = esp_info,
	.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 = DISABLE_CLUSTERING,
	};
	#include "scsi_module.c"