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>

4 files changed, 59 insertions, 207 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 8ce4a5878d0c..8af1ac69e5f8 100644
--- a/drivers/ide/Kconfig
+++ b/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"
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index 45a1c0463bed..991eb72a786b 100644
--- a/drivers/ide/Makefile
+++ b/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
diff --git a/drivers/ide/falconide.c b/drivers/ide/falconide.c
index bb86d84558d9..a73a9dc17e4d 100644
--- a/drivers/ide/falconide.c
+++ b/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)
@@ -98,8 +94,10 @@ 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,
@@ -107,7 +105,8 @@ static const struct ide_port_info falconide_port_info = {
 	.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;
 }
 
diff --git a/drivers/ide/q40ide.c b/drivers/ide/q40ide.c
deleted file mode 100644
index ecd0a69245f6..000000000000
--- a/drivers/ide/q40ide.c
+++ /dev/null
@@ -1,168 +0,0 @@
-/*
- *  Q40 I/O port IDE Driver
- *
- *     (c) Richard Zidlicky
- *
- *  This file is subject to the terms and conditions of the GNU General Public
- *  License.  See the file COPYING in the main directory of this archive for
- *  more details.
- *
- *
- */
-
-#include <linux/types.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/blkdev.h>
-#include <linux/ide.h>
-#include <linux/module.h>
-
-#include <asm/ide.h>
-
-    /*
-     *  Bases of the IDE interfaces
-     */
-
-#define Q40IDE_NUM_HWIFS	2
-
-#define PCIDE_BASE1	0x1f0
-#define PCIDE_BASE2	0x170
-#define PCIDE_BASE3	0x1e8
-#define PCIDE_BASE4	0x168
-#define PCIDE_BASE5	0x1e0
-#define PCIDE_BASE6	0x160
-
-static const unsigned long pcide_bases[Q40IDE_NUM_HWIFS] = {
-    PCIDE_BASE1, PCIDE_BASE2, /* PCIDE_BASE3, PCIDE_BASE4  , PCIDE_BASE5,
-    PCIDE_BASE6 */
-};
-
-static int q40ide_default_irq(unsigned long base)
-{
-           switch (base) {
-	            case 0x1f0: return 14;
-		    case 0x170: return 15;
-		    case 0x1e8: return 11;
-		    default:
-			return 0;
-	   }
-}
-
-
-/*
- * Addresses are pretranslated for Q40 ISA access.
- */
-static void q40_ide_setup_ports(struct ide_hw *hw, unsigned long base, int irq)
-{
-	memset(hw, 0, sizeof(*hw));
-	/* BIG FAT WARNING: 
-	   assumption: only DATA port is ever used in 16 bit mode */
-	hw->io_ports.data_addr = Q40_ISA_IO_W(base);
-	hw->io_ports.error_addr = Q40_ISA_IO_B(base + 1);
-	hw->io_ports.nsect_addr = Q40_ISA_IO_B(base + 2);
-	hw->io_ports.lbal_addr = Q40_ISA_IO_B(base + 3);
-	hw->io_ports.lbam_addr = Q40_ISA_IO_B(base + 4);
-	hw->io_ports.lbah_addr = Q40_ISA_IO_B(base + 5);
-	hw->io_ports.device_addr = Q40_ISA_IO_B(base + 6);
-	hw->io_ports.status_addr = Q40_ISA_IO_B(base + 7);
-	hw->io_ports.ctl_addr = Q40_ISA_IO_B(base + 0x206);
-
-	hw->irq = irq;
-}
-
-static void q40ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
-			      void *buf, unsigned int len)
-{
-	unsigned long data_addr = drive->hwif->io_ports.data_addr;
-
-	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
-		__ide_mm_insw(data_addr, buf, (len + 1) / 2);
-		return;
-	}
-
-	raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
-}
-
-static void q40ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
-			       void *buf, unsigned int len)
-{
-	unsigned long data_addr = drive->hwif->io_ports.data_addr;
-
-	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
-		__ide_mm_outsw(data_addr, buf, (len + 1) / 2);
-		return;
-	}
-
-	raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
-}
-
-/* Q40 has a byte-swapped IDE interface */
-static const struct ide_tp_ops q40ide_tp_ops = {
-	.exec_command		= ide_exec_command,
-	.read_status		= ide_read_status,
-	.read_altstatus		= ide_read_altstatus,
-	.write_devctl		= ide_write_devctl,
-
-	.dev_select		= ide_dev_select,
-	.tf_load		= ide_tf_load,
-	.tf_read		= ide_tf_read,
-
-	.input_data		= q40ide_input_data,
-	.output_data		= q40ide_output_data,
-};
-
-static const struct ide_port_info q40ide_port_info = {
-	.tp_ops			= &q40ide_tp_ops,
-	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
-	.irq_flags		= IRQF_SHARED,
-	.chipset		= ide_generic,
-};
-
-/* 
- * the static array is needed to have the name reported in /proc/ioports,
- * hwif->name unfortunately isn't available yet
- */
-static const char *q40_ide_names[Q40IDE_NUM_HWIFS]={
-	"ide0", "ide1"
-};
-
-/*
- *  Probe for Q40 IDE interfaces
- */
-
-static int __init q40ide_init(void)
-{
-    int i;
-    struct ide_hw hw[Q40IDE_NUM_HWIFS], *hws[] = { NULL, NULL };
-
-    if (!MACH_IS_Q40)
-      return -ENODEV;
-
-    printk(KERN_INFO "ide: Q40 IDE controller\n");
-
-    for (i = 0; i < Q40IDE_NUM_HWIFS; i++) {
-	const char *name = q40_ide_names[i];
-
-	if (!request_region(pcide_bases[i], 8, name)) {
-		printk("could not reserve ports %lx-%lx for %s\n",
-		       pcide_bases[i],pcide_bases[i]+8,name);
-		continue;
-	}
-	if (!request_region(pcide_bases[i]+0x206, 1, name)) {
-		printk("could not reserve port %lx for %s\n",
-		       pcide_bases[i]+0x206,name);
-		release_region(pcide_bases[i], 8);
-		continue;
-	}
-	q40_ide_setup_ports(&hw[i], pcide_bases[i],
-			q40ide_default_irq(pcide_bases[i]));
-
-	hws[i] = &hw[i];
-    }
-
-    return ide_host_add(&q40ide_port_info, hws, Q40IDE_NUM_HWIFS, NULL);
-}
-
-module_init(q40ide_init);
-
-MODULE_LICENSE("GPL");