I was hoping to get some comments on this work in progress driver for
using a compact flash device running in True IDE Mode connect via a MMIO
interface. The driver is working, however the embedded system I'm running
on need some HW fixes to address the fact that the byte lanes for the data
are swapped. I figured now was a good time to incorporate any changes
while I wait for the HW fixes (which will allow me to remove the
cfide_outsw & cfide_insw).
- kumar
diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 1c81174..8334baf 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -930,6 +930,12 @@ config BLK_DEV_Q40IDE
normally be on; disable it only if you are running a custom hard
drive subsystem through an expansion card.
+config BLK_DEV_CFIDE
+ tristate "Compact Flash in True IDE mode"
+ help
+ This is the IDE driver for a Memory Mapped Compact Flash Device
+ running in True IDE mode.
+
config BLK_DEV_MPC8xx_IDE
bool "MPC8xx IDE support"
depends on 8xx && IDE=y && BLK_DEV_IDE=y
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index 569fae7..09ed3aa 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -32,6 +32,7 @@ ide-core-$(CONFIG_BLK_DEV_FALCON_IDE) +=
ide-core-$(CONFIG_BLK_DEV_GAYLE) += legacy/gayle.o
ide-core-$(CONFIG_BLK_DEV_MAC_IDE) += legacy/macide.o
ide-core-$(CONFIG_BLK_DEV_Q40IDE) += legacy/q40ide.o
+ide-core-$(CONFIG_BLK_DEV_CFIDE) += legacy/cfide.o
# built-in only drivers from ppc/
ide-core-$(CONFIG_BLK_DEV_MPC8xx_IDE) += ppc/mpc8xx.o
diff --git a/drivers/ide/legacy/cfide.c b/drivers/ide/legacy/cfide.c
new file mode 100644
index 0000000..4444005
--- /dev/null
+++ b/drivers/ide/legacy/cfide.c
@@ -0,0 +1,222 @@
+/*
+ * Compact Flash Memory Mapped True IDE mode driver
+ *
+ * Maintainer: Kumar Gala <[email protected]>
+ *
+ * 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/config.h>
+#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/platform_device.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+
+static void __iomem *cfide_mapbase;
+static void __iomem *cfide_alt_mapbase;
+
+/* xxx: use standard outsw, insw when byte lanes swapped */
+static void cfide_outsw(unsigned long port, void *addr, u32 count)
+{
+ _outsw((volatile u16 __iomem *)port, addr, count);
+}
+
+static void cfide_insw(unsigned long port, void *addr, u32 count)
+{
+ _insw((volatile u16 __iomem *)port, addr, count);
+}
+
+static void cfide_outl(u32 addr, unsigned long port)
+{
+ panic("outl unsupported");
+}
+
+static void cfide_outsl(unsigned long port, void *addr, u32 count)
+{
+ panic("outsl unsupported");
+}
+
+static u32 cfide_inl(unsigned long port)
+{
+ panic("inl unsupported");
+ return 0;
+}
+
+static void cfide_insl(unsigned long port, void *addr, u32 count)
+{
+ panic("insl unsupported");
+}
+
+static ide_hwif_t *cfide_locate_hwif(void __iomem * base, void __iomem * ctrl,
+ unsigned int sz, int irq)
+{
+ 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:
+
+ /* xxx: fix when byte lanes are swapped */
+ hwif->hw.io_ports[IDE_DATA_OFFSET] = port;
+ port += 3;
+ for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET; i++, port += sz)
+ hwif->hw.io_ports[i] = port;
+
+ hwif->hw.io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl + 13;
+
+ 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_unknown;
+
+ hwif->mmio = 2;
+ default_hwif_mmiops(hwif);
+ hwif->OUTL = cfide_outl;
+ hwif->OUTSW = cfide_outsw;
+ hwif->OUTSL = cfide_outsl;
+ hwif->INL = cfide_inl;
+ hwif->INSW = cfide_insw;
+ hwif->INSL = cfide_insl;
+
+ return hwif;
+}
+
+static int __devinit cfide_lbus_probe(struct platform_device *dev)
+{
+ struct resource *res_base, *res_alt, *res_irq;
+ ide_hwif_t *hwif;
+ int ret = 0;
+
+ /* get a pointer to the register memory */
+ res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
+ res_irq = platform_get_resource(dev, IORESOURCE_IRQ, 0);
+
+ if ((!res_base) || (!res_alt) || (!res_irq)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (!request_mem_region
+ (res_base->start, res_base->end - res_base->start + 1, dev->name)) {
+ pr_debug("%s: request_mem_region of base failed\n", dev->name);
+ ret = -EBUSY;
+ goto out;
+ }
+
+ if (!request_mem_region
+ (res_alt->start, res_alt->end - res_alt->start + 1, dev->name)) {
+ pr_debug("%s: request_mem_region of alt failed\n", dev->name);
+ ret = -EBUSY;
+ goto out;
+ }
+
+ cfide_mapbase =
+ ioremap(res_base->start, res_base->end - res_base->start + 1);
+ if (!cfide_mapbase) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ cfide_alt_mapbase =
+ ioremap(res_alt->start, res_alt->end - res_alt->start + 1);
+
+ if (!cfide_alt_mapbase) {
+ ret = -ENOMEM;
+ goto unmap_base;
+ }
+
+ hwif = cfide_locate_hwif(cfide_mapbase, cfide_alt_mapbase, 2,
+ res_irq->start);
+
+ if (!hwif) {
+ ret = -ENODEV;
+ goto unmap_alt;
+ }
+
+ hwif->gendev.parent = &dev->dev;
+ hwif->noprobe = 0;
+
+ probe_hwif_init(hwif);
+
+ platform_set_drvdata(dev, hwif);
+
+ return 0;
+
+ unmap_alt:
+ iounmap(cfide_alt_mapbase);
+ unmap_base:
+ iounmap(cfide_mapbase);
+ out:
+ return ret;
+}
+
+static int __devexit cfide_lbus_remove(struct platform_device *dev)
+{
+ ide_hwif_t *hwif = platform_get_drvdata(dev);
+ struct resource *res_base, *res_alt;
+
+ /* get a pointer to the register memory */
+ res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
+
+ release_mem_region(res_base->start, res_base->end - res_base->start + 1);
+ release_mem_region(res_alt->start, res_alt->end - res_alt->start + 1);
+
+ platform_set_drvdata(dev, NULL);
+
+ /* there must be a better way */
+ ide_unregister(hwif - ide_hwifs);
+
+ iounmap(cfide_mapbase);
+ iounmap(cfide_alt_mapbase);
+
+ return 0;
+}
+
+static struct platform_driver cfide_driver = {
+ .probe = cfide_lbus_probe,
+ .remove = __devexit_p(cfide_lbus_remove),
+ .driver = {
+ .name = "mmio-cfide",
+ },
+};
+
+static int __init cfide_lbus_init(void)
+{
+ return platform_driver_register(&cfide_driver);
+}
+
+static void __exit cfide_lbus_exit(void)
+{
+ platform_driver_unregister(&cfide_driver);
+}
+
+MODULE_DESCRIPTION("MMIO based True IDE Mode Compact Flash Driver");
+MODULE_LICENSE("GPL");
+
+module_init(cfide_lbus_init);
+module_exit(cfide_lbus_exit);
-
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