[PATCH 1/2] [IDE] Platform IDE driver (was: MMIO IDE driver)

Vitaly Bordug
2007-07-25T16:53:39Z

This is now very similar to pata_platform.c, they both use
same platform data structure and same resources.

To achieve that, byte_lanes_swapping platform data variable
and platform specified iops removed from that driver. It's fine,
since those were never used anyway.

pata_platform and ide_platform are carrying same driver names,
to easily switch between these drivers, without need to touch
platform code.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Vitaly Bordug <vitb@kernel.crashing.org>

---

drivers/ide/Kconfig | 8 ++
drivers/ide/legacy/Makefile | 2
drivers/ide/legacy/ide_platform.c | 181 +++++++++++++++++++++++++++++++++++++
3 files changed, 191 insertions(+), 0 deletions(-)

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index b1a9b81..b5a44da 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -308,6 +308,14 @@ config IDE_GENERIC
help
If unsure, say Y.

+config BLK_DEV_PLATFORM
+ tristate "Platform driver for IDE interfaces"
+ help
+ This is the platform IDE driver, used mostly for Memory Mapped
+ IDE devices, like Compact Flashes running in True IDE mode.
+
+ If unsure, say N.
+
config BLK_DEV_CMD640
bool "CMD640 chipset bugfix/support"
depends on X86
diff --git a/drivers/ide/legacy/Makefile b/drivers/ide/legacy/Makefile
index c797106..4098223 100644
--- a/drivers/ide/legacy/Makefile
+++ b/drivers/ide/legacy/Makefile
@@ -7,6 +7,8 @@ obj-$(CONFIG_BLK_DEV_UMC8672) += umc8672.o

obj-$(CONFIG_BLK_DEV_IDECS) += ide-cs.o

+obj-$(CONFIG_BLK_DEV_PLATFORM) += ide_platform.o
+
# Last of all
obj-$(CONFIG_BLK_DEV_HD) += hd.o

diff --git a/drivers/ide/legacy/ide_platform.c b/drivers/ide/legacy/ide_platform.c
new file mode 100644
index 0000000..0b3f5b5
--- /dev/null
+++ b/drivers/ide/legacy/ide_platform.c
@@ -0,0 +1,181 @@
+/*
+ * Platform IDE driver
+ *
+ * Copyright (C) 2007 MontaVista Software
+ *
+ * Maintainer: Kumar Gala <galak@kernel.crashing.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/ide.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/pata_platform.h>
+#include <linux/io.h>
+
+static struct {
+ void __iomem *plat_ide_mapbase;
+ void __iomem *plat_ide_alt_mapbase;
+ ide_hwif_t *hwif;
+ int index;
+} hwif_prop;
+
+static ide_hwif_t *__devinit plat_ide_locate_hwif(void __iomem *base,
+ void __iomem *ctrl, struct pata_platform_info *pdata, int irq,
+ int mmio)
+{
+ unsigned long port = (unsigned long)base;
+ ide_hwif_t *hwif;
+ int index, i;
+
+ for (index = 0; index < MAX_HWIFS; ++index) {
+ hwif = ide_hwifs + index;
+ if (hwif->io_ports[IDE_DATA_OFFSET] == port)
+ goto found;
+ }
+
+ for (index = 0; index < MAX_HWIFS; ++index) {
+ hwif = ide_hwifs + index;
+ if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
+ goto found;
+ }
+
+ return NULL;
+
+found:
+
+ hwif->hw.io_ports[IDE_DATA_OFFSET] = port;
+
+ port += (1 << pdata->ioport_shift);
+ for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET;
+ i++, port += (1 << pdata->ioport_shift))
+ hwif->hw.io_ports[i] = port;
+
+ hwif->hw.io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl;
+
+ memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
+ hwif->hw.irq = hwif->irq = irq;
+
+ hwif->hw.dma = NO_DMA;
+ hwif->hw.chipset = ide_generic;
+
+ if (mmio) {
+ hwif->mmio = 1;
+ default_hwif_mmiops(hwif);
+ }
+
+ hwif_prop.hwif = hwif;
+ hwif_prop.index = index;
+
+ return hwif;
+}
+
+static int __devinit plat_ide_probe(struct platform_device *pdev)
+{
+ struct resource *res_base, *res_alt, *res_irq;
+ ide_hwif_t *hwif;
+ struct pata_platform_info *pdata;
+ int ret = 0;
+ int mmio = 0;
+
+ pdata = pdev->dev.platform_data;
+
+ /* get a pointer to the register memory */
+ res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
+
+ if (!res_base || !res_alt) {
+ res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res_base || !res_alt) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ mmio = 1;
+ }
+
+ res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res_irq) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (mmio) {
+ hwif_prop.plat_ide_mapbase = devm_ioremap(&pdev->dev,
+ res_base->start, res_base->end - res_base->start + 1);
+ hwif_prop.plat_ide_alt_mapbase = devm_ioremap(&pdev->dev,
+ res_alt->start, res_alt->end - res_alt->start + 1);
+ } else {
+ hwif_prop.plat_ide_mapbase = devm_ioport_map(&pdev->dev,
+ res_base->start, res_base->end - res_base->start + 1);
+ hwif_prop.plat_ide_alt_mapbase = devm_ioport_map(&pdev->dev,
+ res_alt->start, res_alt->end - res_alt->start + 1);
+ }
+
+ hwif = plat_ide_locate_hwif(hwif_prop.plat_ide_mapbase,
+ hwif_prop.plat_ide_alt_mapbase, pdata, res_irq->start, mmio);
+
+ if (!hwif) {
+ ret = -ENODEV;
+ goto out;
+ }
+ hwif->gendev.parent = &pdev->dev;
+ hwif->noprobe = 0;
+
+ probe_hwif_init(hwif);
+
+ platform_set_drvdata(pdev, hwif);
+ ide_proc_register_port(hwif);
+
+ return 0;
+
+out:
+ return ret;
+}
+
+static int __devexit plat_ide_remove(struct platform_device *pdev)
+{
+ ide_hwif_t *hwif = pdev->dev.driver_data;
+
+ if (hwif != hwif_prop.hwif) {
+ dev_printk(KERN_DEBUG, &pdev->dev, "%s: hwif value error",
+ pdev->name);
+ } else {
+ ide_unregister(hwif_prop.index);
+ hwif_prop.index = 0;
+ hwif_prop.hwif = NULL;
+ }
+
+ return 0;
+}
+
+static struct platform_driver platform_ide_driver = {
+ .driver {
+ .name = "pata_platform",
+ },
+ .probe = plat_ide_probe,
+ .remove = __devexit_p(plat_ide_remove),
+};
+
+static int __init platform_ide_init(void)
+{
+ return platform_driver_register(&platform_ide_driver);
+}
+
+static void __exit platform_ide_exit(void)
+{
+ platform_driver_unregister(&platform_ide_driver);
+}
+
+MODULE_DESCRIPTION("Platform IDE driver");
+MODULE_LICENSE("GPL");
+
+module_init(platform_ide_init);
+module_exit(platform_ide_exit);