m68k/q40: Replace q40ide driver with pata_falcon and falconide

This allows m68k q40 systems to switch from the deprecated IDE subsystem
to libata.

Enhance the byte-swapping falconide and pata_falcon platform drivers to
accept an irq resource, for use on q40. Atari ST-DMA IRQ arrangements seem
to co-exist with q40 IRQ arrangements without too much mess.

The new IO resources were added solely for the purpose of making
request_region() reservations identical to those made by q40ide: these
regions aren't used for actual IO.

Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Richard Zidlicky <rz@linux-m68k.org>
Reviewed-and-tested-by: Michael Schmitz <schmitzmic@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Link: https://lore.kernel.org/r/eefb7e9c2291e09fb4e065ce06bc105f05bb9e06.1623287706.git.fthain@linux-m68k.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

arch/m68k/atari/config.c

@@ -875,16 +875,8 @@ static const struct resource atari_scsi_tt_rsrc[] __initconst = {
 #define FALCON_IDE_BASE	0xfff00000
 
 static const struct resource atari_falconide_rsrc[] __initconst = {
-	{
-		.flags = IORESOURCE_MEM,
-		.start = FALCON_IDE_BASE,
-		.end   = FALCON_IDE_BASE + 0x39,
-	},
-	{
-		.flags = IORESOURCE_IRQ,
-		.start = IRQ_MFP_FSCSI,
-		.end   = IRQ_MFP_FSCSI,
-	},
+	DEFINE_RES_MEM(FALCON_IDE_BASE, 0x38),
+	DEFINE_RES_MEM(FALCON_IDE_BASE + 0x38, 2),
 };
 
 int __init atari_platform_init(void)

arch/m68k/configs/multi_defconfig

@@ -351,7 +351,6 @@ CONFIG_BLK_DEV_PLATFORM=y
 CONFIG_BLK_DEV_GAYLE=y
 CONFIG_BLK_DEV_BUDDHA=y
 CONFIG_BLK_DEV_FALCON_IDE=y
-CONFIG_BLK_DEV_Q40IDE=y
 CONFIG_RAID_ATTRS=m
 CONFIG_SCSI=y
 CONFIG_BLK_DEV_SD=y

arch/m68k/configs/q40_defconfig

@@ -317,7 +317,7 @@ CONFIG_DUMMY_IRQ=m
 CONFIG_IDE=y
 CONFIG_IDE_GD_ATAPI=y
 CONFIG_BLK_DEV_IDECD=y
-CONFIG_BLK_DEV_Q40IDE=y
+CONFIG_BLK_DEV_FALCON_IDE=y
 CONFIG_RAID_ATTRS=m
 CONFIG_SCSI=y
 CONFIG_BLK_DEV_SD=y

arch/m68k/q40/config.c

@@ -286,14 +286,39 @@ static int q40_set_rtc_pll(struct rtc_pll_info *pll)
 		return -EINVAL;
 }
 
-static __init int q40_add_kbd_device(void)
-{
-	struct platform_device *pdev;
+#define PCIDE_BASE1	0x1f0
+#define PCIDE_BASE2	0x170
+#define PCIDE_CTL	0x206
+
+static const struct resource q40_pata_rsrc_0[] __initconst = {
+	DEFINE_RES_MEM(q40_isa_io_base + PCIDE_BASE1 * 4, 0x38),
+	DEFINE_RES_MEM(q40_isa_io_base + (PCIDE_BASE1 + PCIDE_CTL) * 4, 2),
+	DEFINE_RES_IO(PCIDE_BASE1, 8),
+	DEFINE_RES_IO(PCIDE_BASE1 + PCIDE_CTL, 1),
+	DEFINE_RES_IRQ(14),
+};
 
+static const struct resource q40_pata_rsrc_1[] __initconst = {
+	DEFINE_RES_MEM(q40_isa_io_base + PCIDE_BASE2 * 4, 0x38),
+	DEFINE_RES_MEM(q40_isa_io_base + (PCIDE_BASE2 + PCIDE_CTL) * 4, 2),
+	DEFINE_RES_IO(PCIDE_BASE2, 8),
+	DEFINE_RES_IO(PCIDE_BASE2 + PCIDE_CTL, 1),
+	DEFINE_RES_IRQ(15),
+};
+
+static __init int q40_platform_init(void)
+{
 	if (!MACH_IS_Q40)
 		return -ENODEV;
 
-	pdev = platform_device_register_simple("q40kbd", -1, NULL, 0);
-	return PTR_ERR_OR_ZERO(pdev);
+	platform_device_register_simple("q40kbd", -1, NULL, 0);
+
+	platform_device_register_simple("atari-falcon-ide", 0, q40_pata_rsrc_0,
+					ARRAY_SIZE(q40_pata_rsrc_0));
+
+	platform_device_register_simple("atari-falcon-ide", 1, q40_pata_rsrc_1,
+					ARRAY_SIZE(q40_pata_rsrc_1));
+
+	return 0;
 }
-arch_initcall(q40_add_kbd_device);
+arch_initcall(q40_platform_init);

drivers/ata/Kconfig

@@ -1015,11 +1015,11 @@ config PATA_CMD640_PCI
 	  If unsure, say N.
 
 config PATA_FALCON
-	tristate "Atari Falcon PATA support"
-	depends on M68K && ATARI
+	tristate "Atari Falcon and Q40/Q60 PATA support"
+	depends on M68K && (ATARI || Q40)
 	help
 	  This option enables support for the on-board IDE
-	  interface on the Atari Falcon.
+	  interface on the Atari Falcon and Q40/Q60.
 
 	  If unsure, say N.
 

drivers/ata/pata_falcon.c

@@ -33,8 +33,6 @@
 #define DRV_NAME "pata_falcon"
 #define DRV_VERSION "0.1.0"
 
-#define ATA_HD_CONTROL	0x39
-
 static struct scsi_host_template pata_falcon_sht = {
 	ATA_PIO_SHT(DRV_NAME),
 };
@@ -121,23 +119,42 @@ static struct ata_port_operations pata_falcon_ops = {
 
 static int __init pata_falcon_init_one(struct platform_device *pdev)
 {
-	struct resource *res;
+	struct resource *base_mem_res, *ctl_mem_res;
+	struct resource *base_res, *ctl_res, *irq_res;
 	struct ata_host *host;
 	struct ata_port *ap;
 	void __iomem *base;
+	int irq = 0;
 
-	dev_info(&pdev->dev, "Atari Falcon PATA controller\n");
+	dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n");
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
+	base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (base_res && !devm_request_region(&pdev->dev, base_res->start,
+					   resource_size(base_res), DRV_NAME)) {
+		dev_err(&pdev->dev, "resources busy\n");
+		return -EBUSY;
+	}
 
-	if (!devm_request_mem_region(&pdev->dev, res->start,
-				     resource_size(res), DRV_NAME)) {
+	ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+	if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,
+					    resource_size(ctl_res), DRV_NAME)) {
 		dev_err(&pdev->dev, "resources busy\n");
 		return -EBUSY;
 	}
 
+	base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!base_mem_res)
+		return -ENODEV;
+	if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,
+				     resource_size(base_mem_res), DRV_NAME)) {
+		dev_err(&pdev->dev, "resources busy\n");
+		return -EBUSY;
+	}
+
+	ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!ctl_mem_res)
+		return -ENODEV;
+
 	/* allocate host */
 	host = ata_host_alloc(&pdev->dev, 1);
 	if (!host)
@@ -147,10 +164,10 @@ static int __init pata_falcon_init_one(struct platform_device *pdev)
 	ap->ops = &pata_falcon_ops;
 	ap->pio_mask = ATA_PIO4;
 	ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
-	ap->flags |= ATA_FLAG_PIO_POLLING;
 
-	base = (void __iomem *)res->start;
-	ap->ioaddr.data_addr		= base;
+	base = (void __iomem *)base_mem_res->start;
+	/* N.B. this assumes data_addr will be used for word-sized I/O only */
+	ap->ioaddr.data_addr		= base + 0 + 0 * 4;
 	ap->ioaddr.error_addr		= base + 1 + 1 * 4;
 	ap->ioaddr.feature_addr		= base + 1 + 1 * 4;
 	ap->ioaddr.nsect_addr		= base + 1 + 2 * 4;
@@ -161,14 +178,25 @@ static int __init pata_falcon_init_one(struct platform_device *pdev)
 	ap->ioaddr.status_addr		= base + 1 + 7 * 4;
 	ap->ioaddr.command_addr		= base + 1 + 7 * 4;
 
-	ap->ioaddr.altstatus_addr	= base + ATA_HD_CONTROL;
-	ap->ioaddr.ctl_addr		= base + ATA_HD_CONTROL;
+	base = (void __iomem *)ctl_mem_res->start;
+	ap->ioaddr.altstatus_addr	= base + 1;
+	ap->ioaddr.ctl_addr		= base + 1;
 
-	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
-		      (unsigned long)base + ATA_HD_CONTROL);
+	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
+		      (unsigned long)base_mem_res->start,
+		      (unsigned long)ctl_mem_res->start);
+
+	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (irq_res && irq_res->start > 0) {
+		irq = irq_res->start;
+	} else {
+		ap->flags |= ATA_FLAG_PIO_POLLING;
+		ata_port_desc(ap, "no IRQ, using PIO polling");
+	}
 
 	/* activate */
-	return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
+	return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
+				 IRQF_SHARED, &pata_falcon_sht);
 }
 
 static int __exit pata_falcon_remove_one(struct platform_device *pdev)

drivers/ide/Kconfig

@@ -731,21 +731,13 @@ config BLK_DEV_BUDDHA
 	  to one of its IDE interfaces.
 
 config BLK_DEV_FALCON_IDE
-	tristate "Falcon IDE interface support"
-	depends on ATARI
+	tristate "Falcon and Q40/Q60 IDE interface support"
+	depends on ATARI || Q40
 	help
 	  This is the IDE driver for the on-board IDE interface on the Atari
-	  Falcon. Say Y if you have a Falcon and want to use IDE devices (hard
-	  disks, CD-ROM drives, etc.) that are connected to the on-board IDE
-	  interface.
-
-config BLK_DEV_Q40IDE
-	tristate "Q40/Q60 IDE interface support"
-	depends on Q40
-	help
-	  Enable the on-board IDE controller in the Q40/Q60.  This should
-	  normally be on; disable it only if you are running a custom hard
-	  drive subsystem through an expansion card.
+	  Falcon and Q40/Q60. Say Y if you have such a machine and want to use
+	  IDE devices (hard disks, CD-ROM drives, etc.) that are connected to
+	  the on-board IDE interface.
 
 config BLK_DEV_PALMCHIP_BK3710
 	tristate "Palmchip bk3710 IDE controller support"

drivers/ide/Makefile

@@ -29,7 +29,6 @@ obj-$(CONFIG_BLK_DEV_4DRIVES)		+= ide-4drives.o
 
 obj-$(CONFIG_BLK_DEV_GAYLE)		+= gayle.o
 obj-$(CONFIG_BLK_DEV_FALCON_IDE)	+= falconide.o
-obj-$(CONFIG_BLK_DEV_Q40IDE)		+= q40ide.o
 obj-$(CONFIG_BLK_DEV_BUDDHA)		+= buddha.o
 
 obj-$(CONFIG_BLK_DEV_AEC62XX)		+= aec62xx.o

drivers/ide/falconide.c

@@ -25,12 +25,7 @@
 
 #define DRV_NAME "falconide"
 
-    /*
-     *  Offsets from base address
-     */
-
-#define ATA_HD_CONTROL	0x39
-
+#ifdef CONFIG_ATARI
     /*
      *  falconide_intr_lock is used to obtain access to the IDE interrupt,
      *  which is shared between several drivers.
@@ -55,6 +50,7 @@ static void falconide_get_lock(irq_handler_t handler, void *data)
 		falconide_intr_lock = 1;
 	}
 }
+#endif
 
 static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
 				 void *buf, unsigned int len)
@@ -98,16 +94,19 @@ static const struct ide_tp_ops falconide_tp_ops = {
 };
 
 static const struct ide_port_info falconide_port_info = {
+#ifdef CONFIG_ATARI
 	.get_lock		= falconide_get_lock,
 	.release_lock		= falconide_release_lock,
+#endif
 	.tp_ops			= &falconide_tp_ops,
 	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
 				  IDE_HFLAG_NO_DMA,
 	.irq_flags		= IRQF_SHARED,
 	.chipset		= ide_generic,
 };
 
-static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base)
+static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base,
+					 unsigned long ctl, int irq)
 {
 	int i;
 
@@ -118,9 +117,9 @@ static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base)
 	for (i = 1; i < 8; i++)
 		hw->io_ports_array[i] = base + 1 + i * 4;
 
-	hw->io_ports.ctl_addr = base + ATA_HD_CONTROL;
+	hw->io_ports.ctl_addr = ctl + 1;
 
-	hw->irq = IRQ_MFP_IDE;
+	hw->irq = irq;
 }
 
     /*
@@ -129,37 +128,69 @@ static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base)
 
 static int __init falconide_init(struct platform_device *pdev)
 {
-	struct resource *res;
+	struct resource *base_mem_res, *ctl_mem_res;
+	struct resource *base_res, *ctl_res, *irq_res;
 	struct ide_host *host;
 	struct ide_hw hw, *hws[] = { &hw };
-	unsigned long base;
 	int rc;
+	int irq;
+
+	dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 IDE controller\n");
+
+	base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (base_res && !devm_request_region(&pdev->dev, base_res->start,
+					   resource_size(base_res), DRV_NAME)) {
+		dev_err(&pdev->dev, "resources busy\n");
+		return -EBUSY;
+	}
 
-	dev_info(&pdev->dev, "Atari Falcon IDE controller\n");
+	ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,
+					   resource_size(ctl_res), DRV_NAME)) {
+		dev_err(&pdev->dev, "resources busy\n");
+		return -EBUSY;
+	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
+	base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!base_mem_res)
 		return -ENODEV;
 
-	if (!devm_request_mem_region(&pdev->dev, res->start,
-				     resource_size(res), DRV_NAME)) {
+	if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,
+				     resource_size(base_mem_res), DRV_NAME)) {
 		dev_err(&pdev->dev, "resources busy\n");
 		return -EBUSY;
 	}
 
-	base = (unsigned long)res->start;
+	ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!ctl_mem_res)
+		return -ENODEV;
+
+	if (MACH_IS_ATARI) {
+		irq = IRQ_MFP_IDE;
+	} else {
+		irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+		if (irq_res && irq_res->start > 0)
+			irq = irq_res->start;
+		else
+			return -ENODEV;
+	}
 
-	falconide_setup_ports(&hw, base);
+	falconide_setup_ports(&hw, base_mem_res->start, ctl_mem_res->start, irq);
 
 	host = ide_host_alloc(&falconide_port_info, hws, 1);
-	if (host == NULL) {
-		rc = -ENOMEM;
-		goto err;
+	if (!host)
+		return -ENOMEM;
+
+	if (!MACH_IS_ATARI) {
+		host->get_lock = NULL;
+		host->release_lock = NULL;
 	}
 
-	falconide_get_lock(NULL, NULL);
+	if (host->get_lock)
+		host->get_lock(NULL, NULL);
 	rc = ide_host_register(host, &falconide_port_info, hws);
-	falconide_release_lock();
+	if (host->release_lock)
+		host->release_lock();
 
 	if (rc)
 		goto err_free;
@@ -168,8 +199,6 @@ static int __init falconide_init(struct platform_device *pdev)
 	return 0;
 err_free:
 	ide_host_free(host);
-err:
-	release_mem_region(res->start, resource_size(res));
 	return rc;
 }