[PATCH 23/29] atari_scsi: Convert to platform device

[Finn Thain <fthain@telegraphics.com.au>]

[-- Attachment #1: atari_scsi-convert-to-platform-device --]
[-- Type: text/plain, Size: 16911 bytes --]

Convert atari_scsi to platform device and eliminate scsi_register().

Validate __setup options later on so that module options are checked as well.

Remove the comment about the scsi mid-layer disabling the host irq as it
is no longer true (AFAICT). Also remove the obsolete slow interrupt stuff
(IRQ_TYPE_SLOW == 0 anyway).

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>

---
 arch/m68k/atari/config.c  |    5 
 drivers/scsi/atari_scsi.c |  426 ++++++++++++++++++++++------------------------
 drivers/scsi/atari_scsi.h |   17 -
 3 files changed, 217 insertions(+), 231 deletions(-)

Index: linux/arch/m68k/atari/config.c
===================================================================
--- linux.orig/arch/m68k/atari/config.c	2014-10-02 16:55:28.000000000 +1000
+++ linux/arch/m68k/atari/config.c	2014-10-02 16:56:21.000000000 +1000
@@ -892,6 +892,11 @@ int __init atari_platform_init(void)
 	}
 #endif
 
+#ifdef CONFIG_ATARI_SCSI
+	if (ATARIHW_PRESENT(ST_SCSI) || ATARIHW_PRESENT(TT_SCSI))
+		platform_device_register_simple("atari_scsi", -1, NULL, 0);
+#endif
+
 	return rv;
 }
 
Index: linux/drivers/scsi/atari_scsi.c
===================================================================
--- linux.orig/drivers/scsi/atari_scsi.c	2014-10-02 16:56:20.000000000 +1000
+++ linux/drivers/scsi/atari_scsi.c	2014-10-02 16:56:21.000000000 +1000
@@ -74,33 +74,26 @@
 #define	MAX_TAGS 32
 
 #include <linux/types.h>
-#include <linux/stddef.h>
-#include <linux/ctype.h>
 #include <linux/delay.h>
-#include <linux/mm.h>
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/nvram.h>
 #include <linux/bitops.h>
 #include <linux/wait.h>
+#include <linux/platform_device.h>
 
 #include <asm/setup.h>
 #include <asm/atarihw.h>
 #include <asm/atariints.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/irq.h>
-#include <asm/traps.h>
-
-#include <scsi/scsi_host.h>
-#include "atari_scsi.h"
-#include "NCR5380.h"
 #include <asm/atari_stdma.h>
 #include <asm/atari_stram.h>
 #include <asm/io.h>
 
-#include <linux/stat.h>
+#include <scsi/scsi_host.h>
+
+#include "atari_scsi.h"
+#include "NCR5380.h"
 
 #define	IS_A_TT()	ATARIHW_PRESENT(TT_SCSI)
 
@@ -176,25 +169,9 @@ static inline void DISABLE_IRQ(void)
 #define	AFTER_RESET_DELAY	(5*HZ/2)
 #endif
 
-/***************************** Prototypes *****************************/
-
 #ifdef REAL_DMA
 static void atari_scsi_fetch_restbytes(void);
 #endif
-static irqreturn_t scsi_tt_intr(int irq, void *dummy);
-static irqreturn_t scsi_falcon_intr(int irq, void *dummy);
-static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata);
-static int falcon_get_lock(void);
-#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
-static void atari_scsi_reset_boot(void);
-#endif
-static unsigned char atari_scsi_tt_reg_read(unsigned char reg);
-static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value);
-static unsigned char atari_scsi_falcon_reg_read(unsigned char reg);
-static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value);
-
-/************************* End of Prototypes **************************/
-
 
 static struct Scsi_Host *atari_scsi_host;
 static unsigned char (*atari_scsi_reg_read)(unsigned char reg);
@@ -518,160 +495,12 @@ static int falcon_get_lock(void)
 	}
 }
 
-
-static int __init atari_scsi_detect(struct scsi_host_template *host)
-{
-	static int called = 0;
-	struct Scsi_Host *instance;
-
-	if (!MACH_IS_ATARI ||
-	    (!ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(TT_SCSI)) ||
-	    called)
-		return 0;
-
-	host->proc_name = "Atari";
-
-	atari_scsi_reg_read  = IS_A_TT() ? atari_scsi_tt_reg_read :
-					   atari_scsi_falcon_reg_read;
-	atari_scsi_reg_write = IS_A_TT() ? atari_scsi_tt_reg_write :
-					   atari_scsi_falcon_reg_write;
-
-	/* setup variables */
-	host->can_queue =
-		(setup_can_queue > 0) ? setup_can_queue :
-		IS_A_TT() ? ATARI_TT_CAN_QUEUE : ATARI_FALCON_CAN_QUEUE;
-	host->cmd_per_lun =
-		(setup_cmd_per_lun > 0) ? setup_cmd_per_lun :
-		IS_A_TT() ? ATARI_TT_CMD_PER_LUN : ATARI_FALCON_CMD_PER_LUN;
-	/* Force sg_tablesize to 0 on a Falcon! */
-	host->sg_tablesize =
-		!IS_A_TT() ? ATARI_FALCON_SG_TABLESIZE :
-		(setup_sg_tablesize >= 0) ? setup_sg_tablesize : ATARI_TT_SG_TABLESIZE;
-
-	if (setup_hostid >= 0)
-		host->this_id = setup_hostid;
-	else {
-		/* use 7 as default */
-		host->this_id = 7;
-		/* Test if a host id is set in the NVRam */
-		if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
-			unsigned char b = nvram_read_byte( 14 );
-			/* Arbitration enabled? (for TOS) If yes, use configured host ID */
-			if (b & 0x80)
-				host->this_id = b & 7;
-		}
-	}
-
-#ifdef SUPPORT_TAGS
-	if (setup_use_tagged_queuing < 0)
-		setup_use_tagged_queuing = 0;
-#endif
-#ifdef REAL_DMA
-	/* If running on a Falcon and if there's TT-Ram (i.e., more than one
-	 * memory block, since there's always ST-Ram in a Falcon), then allocate a
-	 * STRAM_BUFFER_SIZE byte dribble buffer for transfers from/to alternative
-	 * Ram.
-	 */
-	if (MACH_IS_ATARI && ATARIHW_PRESENT(ST_SCSI) &&
-	    !ATARIHW_PRESENT(EXTD_DMA) && m68k_num_memory > 1) {
-		atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI");
-		if (!atari_dma_buffer) {
-			printk(KERN_ERR "atari_scsi_detect: can't allocate ST-RAM "
-					"double buffer\n");
-			return 0;
-		}
-		atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer);
-		atari_dma_orig_addr = 0;
-	}
-#endif
-	instance = scsi_register(host, sizeof(struct NCR5380_hostdata));
-	if (instance == NULL) {
-		atari_stram_free(atari_dma_buffer);
-		atari_dma_buffer = 0;
-		return 0;
-	}
-	atari_scsi_host = instance;
-	/*
-	 * Set irq to 0, to avoid that the mid-level code disables our interrupt
-	 * during queue_command calls. This is completely unnecessary, and even
-	 * worse causes bad problems on the Falcon, where the int is shared with
-	 * IDE and floppy!
-	 */
-       instance->irq = 0;
-
-#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
-	atari_scsi_reset_boot();
-#endif
-	NCR5380_init(instance, 0);
-
-	if (IS_A_TT()) {
-
-		/* This int is actually "pseudo-slow", i.e. it acts like a slow
-		 * interrupt after having cleared the pending flag for the DMA
-		 * interrupt. */
-		if (request_irq(IRQ_TT_MFP_SCSI, scsi_tt_intr, IRQ_TYPE_SLOW,
-				 "SCSI NCR5380", instance)) {
-			printk(KERN_ERR "atari_scsi_detect: cannot allocate irq %d, aborting",IRQ_TT_MFP_SCSI);
-			scsi_unregister(atari_scsi_host);
-			atari_stram_free(atari_dma_buffer);
-			atari_dma_buffer = 0;
-			return 0;
-		}
-		tt_mfp.active_edge |= 0x80;		/* SCSI int on L->H */
-#ifdef REAL_DMA
-		tt_scsi_dma.dma_ctrl = 0;
-		atari_dma_residual = 0;
-
-		if (MACH_IS_MEDUSA) {
-			/* While the read overruns (described by Drew Eckhardt in
-			 * NCR5380.c) never happened on TTs, they do in fact on the Medusa
-			 * (This was the cause why SCSI didn't work right for so long
-			 * there.) Since handling the overruns slows down a bit, I turned
-			 * the #ifdef's into a runtime condition.
-			 *
-			 * In principle it should be sufficient to do max. 1 byte with
-			 * PIO, but there is another problem on the Medusa with the DMA
-			 * rest data register. So 'atari_read_overruns' is currently set
-			 * to 4 to avoid having transfers that aren't a multiple of 4. If
-			 * the rest data bug is fixed, this can be lowered to 1.
-			 */
-			atari_read_overruns = 4;
-		}
-#endif /*REAL_DMA*/
-	} else { /* ! IS_A_TT */
-
-		/* Nothing to do for the interrupt: the ST-DMA is initialized
-		 * already by atari_init_INTS()
-		 */
-
-#ifdef REAL_DMA
-		atari_dma_residual = 0;
-		atari_dma_active = 0;
-		atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000
-					: 0xff000000);
-#endif
-	}
-
-	called = 1;
-	return 1;
-}
-
-static int atari_scsi_release(struct Scsi_Host *sh)
-{
-	if (IS_A_TT())
-		free_irq(IRQ_TT_MFP_SCSI, sh);
-	if (atari_dma_buffer)
-		atari_stram_free(atari_dma_buffer);
-	NCR5380_exit(sh);
-	return 1;
-}
-
 #ifndef MODULE
 static int __init atari_scsi_setup(char *str)
 {
 	/* Format of atascsi parameter is:
 	 *   atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
-	 * Defaults depend on TT or Falcon, hostid determined at run time.
+	 * Defaults depend on TT or Falcon, determined at run time.
 	 * Negative values mean don't change.
 	 */
 	int ints[6];
@@ -682,36 +511,17 @@ static int __init atari_scsi_setup(char
 		printk("atari_scsi_setup: no arguments!\n");
 		return 0;
 	}
-
-	if (ints[0] >= 1) {
-		if (ints[1] > 0)
-			/* no limits on this, just > 0 */
-			setup_can_queue = ints[1];
-	}
-	if (ints[0] >= 2) {
-		if (ints[2] > 0)
-			setup_cmd_per_lun = ints[2];
-	}
-	if (ints[0] >= 3) {
-		if (ints[3] >= 0) {
-			setup_sg_tablesize = ints[3];
-			/* Must be <= SG_ALL (255) */
-			if (setup_sg_tablesize > SG_ALL)
-				setup_sg_tablesize = SG_ALL;
-		}
-	}
-	if (ints[0] >= 4) {
-		/* Must be between 0 and 7 */
-		if (ints[4] >= 0 && ints[4] <= 7)
-			setup_hostid = ints[4];
-		else if (ints[4] > 7)
-			printk("atari_scsi_setup: invalid host ID %d !\n", ints[4]);
-	}
+	if (ints[0] >= 1)
+		setup_can_queue = ints[1];
+	if (ints[0] >= 2)
+		setup_cmd_per_lun = ints[2];
+	if (ints[0] >= 3)
+		setup_sg_tablesize = ints[3];
+	if (ints[0] >= 4)
+		setup_hostid = ints[4];
 #ifdef SUPPORT_TAGS
-	if (ints[0] >= 5) {
-		if (ints[5] >= 0)
-			setup_use_tagged_queuing = !!ints[5];
-	}
+	if (ints[0] >= 5)
+		setup_use_tagged_queuing = ints[5];
 #endif
 
 	return 1;
@@ -1020,23 +830,211 @@ static int atari_scsi_bus_reset(struct s
 	return rv;
 }
 
-static struct scsi_host_template driver_template = {
+#define DRV_MODULE_NAME         "atari_scsi"
+#define PFX                     DRV_MODULE_NAME ": "
+
+static struct scsi_host_template atari_scsi_template = {
+	.module			= THIS_MODULE,
+	.proc_name		= DRV_MODULE_NAME,
 	.show_info		= atari_scsi_show_info,
 	.name			= "Atari native SCSI",
-	.detect			= atari_scsi_detect,
-	.release		= atari_scsi_release,
 	.info			= atari_scsi_info,
 	.queuecommand		= atari_scsi_queue_command,
 	.eh_abort_handler	= atari_scsi_abort,
 	.eh_bus_reset_handler	= atari_scsi_bus_reset,
-	.can_queue		= 0, /* initialized at run-time */
-	.this_id		= 0, /* initialized at run-time */
-	.sg_tablesize		= 0, /* initialized at run-time */
-	.cmd_per_lun		= 0, /* initialized at run-time */
+	.this_id		= 7,
 	.use_clustering		= DISABLE_CLUSTERING
 };
 
+static int __init atari_scsi_probe(struct platform_device *pdev)
+{
+	struct Scsi_Host *instance;
+	int error;
+
+	if (!MACH_IS_ATARI)
+		return -ENODEV;
+
+	if (ATARIHW_PRESENT(TT_SCSI)) {
+		atari_scsi_reg_read  = atari_scsi_tt_reg_read;
+		atari_scsi_reg_write = atari_scsi_tt_reg_write;
+	} else if (ATARIHW_PRESENT(ST_SCSI)) {
+		atari_scsi_reg_read  = atari_scsi_falcon_reg_read;
+		atari_scsi_reg_write = atari_scsi_falcon_reg_write;
+	} else
+		return -ENODEV;
+
+	/* The values for CMD_PER_LUN and CAN_QUEUE are somehow arbitrary.
+	 * Higher values should work, too; try it!
+	 * (But cmd_per_lun costs memory!)
+	 *
+	 * But there seems to be a bug somewhere that requires CAN_QUEUE to be
+	 * 2*CMD_PER_LUN. At least on a TT, no spurious timeouts seen since
+	 * changed CMD_PER_LUN...
+	 *
+	 * Note: The Falcon currently uses 8/1 setting due to unsolved problems
+	 * with cmd_per_lun != 1
+	 */
+	if (IS_A_TT()) {
+		atari_scsi_template.can_queue    = 16;
+		atari_scsi_template.cmd_per_lun  = 8;
+		atari_scsi_template.sg_tablesize = SG_ALL;
+	} else {
+		atari_scsi_template.can_queue    = 8;
+		atari_scsi_template.cmd_per_lun  = 1;
+		atari_scsi_template.sg_tablesize = SG_NONE;
+	}
+
+	if (setup_can_queue > 0)
+		atari_scsi_template.can_queue = setup_can_queue;
+
+	if (setup_cmd_per_lun > 0)
+		atari_scsi_template.cmd_per_lun = setup_cmd_per_lun;
+
+	/* Leave sg_tablesize at 0 on a Falcon! */
+	if (IS_A_TT() && setup_sg_tablesize >= 0)
+		atari_scsi_template.sg_tablesize = setup_sg_tablesize;
+
+	if (setup_hostid >= 0) {
+		atari_scsi_template.this_id = setup_hostid & 7;
+	} else {
+		/* Test if a host id is set in the NVRam */
+		if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
+			unsigned char b = nvram_read_byte(14);
+
+			/* Arbitration enabled? (for TOS)
+			 * If yes, use configured host ID
+			 */
+			if (b & 0x80)
+				atari_scsi_template.this_id = b & 7;
+		}
+	}
+
+#ifdef SUPPORT_TAGS
+	if (setup_use_tagged_queuing < 0)
+		setup_use_tagged_queuing = 0;
+#endif
+
+#ifdef REAL_DMA
+	/* If running on a Falcon and if there's TT-Ram (i.e., more than one
+	 * memory block, since there's always ST-Ram in a Falcon), then
+	 * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers
+	 * from/to alternative Ram.
+	 */
+	if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) &&
+	    m68k_num_memory > 1) {
+		atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI");
+		if (!atari_dma_buffer) {
+			pr_err(PFX "can't allocate ST-RAM double buffer\n");
+			return -ENOMEM;
+		}
+		atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer);
+		atari_dma_orig_addr = 0;
+	}
+#endif
+
+	instance = scsi_host_alloc(&atari_scsi_template,
+	                           sizeof(struct NCR5380_hostdata));
+	if (!instance) {
+		error = -ENOMEM;
+		goto fail_alloc;
+	}
+	atari_scsi_host = instance;
+
+#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
+	atari_scsi_reset_boot();
+#endif
+
+	if (IS_A_TT())
+		instance->irq = IRQ_TT_MFP_SCSI;
+	else
+		instance->irq = IRQ_NONE;
+
+	NCR5380_init(instance, 0);
+
+	if (IS_A_TT()) {
+		error = request_irq(instance->irq, scsi_tt_intr, 0,
+		                    "NCR5380", instance);
+		if (error) {
+			pr_err(PFX "request irq %d failed, aborting\n",
+			       instance->irq);
+			goto fail_irq;
+		}
+		tt_mfp.active_edge |= 0x80;	/* SCSI int on L->H */
+#ifdef REAL_DMA
+		tt_scsi_dma.dma_ctrl = 0;
+		atari_dma_residual = 0;
+
+		/* While the read overruns (described by Drew Eckhardt in
+		 * NCR5380.c) never happened on TTs, they do in fact on the
+		 * Medusa (This was the cause why SCSI didn't work right for
+		 * so long there.) Since handling the overruns slows down
+		 * a bit, I turned the #ifdef's into a runtime condition.
+		 *
+		 * In principle it should be sufficient to do max. 1 byte with
+		 * PIO, but there is another problem on the Medusa with the DMA
+		 * rest data register. So 'atari_read_overruns' is currently set
+		 * to 4 to avoid having transfers that aren't a multiple of 4.
+		 * If the rest data bug is fixed, this can be lowered to 1.
+		 */
+		if (MACH_IS_MEDUSA)
+			atari_read_overruns = 4;
+#endif
+	} else {
+		/* Nothing to do for the interrupt: the ST-DMA is initialized
+		 * already.
+		 */
+#ifdef REAL_DMA
+		atari_dma_residual = 0;
+		atari_dma_active = 0;
+		atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000
+					: 0xff000000);
+#endif
+	}
+
+	error = scsi_add_host(instance, NULL);
+	if (error)
+		goto fail_host;
+
+	platform_set_drvdata(pdev, instance);
+
+	scsi_scan_host(instance);
+	return 0;
+
+fail_host:
+	if (instance->irq != IRQ_NONE)
+		free_irq(instance->irq, instance);
+fail_irq:
+	NCR5380_exit(instance);
+	scsi_host_put(instance);
+fail_alloc:
+	if (atari_dma_buffer)
+		atari_stram_free(atari_dma_buffer);
+	return error;
+}
+
+static int __exit atari_scsi_remove(struct platform_device *pdev)
+{
+	struct Scsi_Host *instance = platform_get_drvdata(pdev);
+
+	scsi_remove_host(instance);
+	if (instance->irq != IRQ_NONE)
+		free_irq(instance->irq, instance);
+	NCR5380_exit(instance);
+	scsi_host_put(instance);
+	if (atari_dma_buffer)
+		atari_stram_free(atari_dma_buffer);
+	return 0;
+}
+
+static struct platform_driver atari_scsi_driver = {
+	.remove = __exit_p(atari_scsi_remove),
+	.driver = {
+		.name	= DRV_MODULE_NAME,
+		.owner	= THIS_MODULE,
+	},
+};
 
-#include "scsi_module.c"
+module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe);
 
+MODULE_ALIAS("platform:" DRV_MODULE_NAME);
 MODULE_LICENSE("GPL");
Index: linux/drivers/scsi/atari_scsi.h
===================================================================
--- linux.orig/drivers/scsi/atari_scsi.h	2014-10-02 16:56:10.000000000 +1000
+++ linux/drivers/scsi/atari_scsi.h	2014-10-02 16:56:21.000000000 +1000
@@ -18,23 +18,6 @@
 /* (I_HAVE_OVERRUNS stuff removed) */
 
 #ifndef ASM
-/* The values for CMD_PER_LUN and CAN_QUEUE are somehow arbitrary. Higher
- * values should work, too; try it! (but cmd_per_lun costs memory!) */
-
-/* But there seems to be a bug somewhere that requires CAN_QUEUE to be
- * 2*CMD_PER_LUN. At least on a TT, no spurious timeouts seen since
- * changed CMD_PER_LUN... */
-
-/* Note: The Falcon currently uses 8/1 setting due to unsolved problems with
- * cmd_per_lun != 1 */
-
-#define ATARI_TT_CAN_QUEUE		16
-#define ATARI_TT_CMD_PER_LUN		8
-#define ATARI_TT_SG_TABLESIZE		SG_ALL
-
-#define ATARI_FALCON_CAN_QUEUE		8
-#define ATARI_FALCON_CMD_PER_LUN	1
-#define ATARI_FALCON_SG_TABLESIZE	SG_NONE
 
 #define	NCR5380_implementation_fields	/* none */