pcmcia: CompactFlash driver for PA Semi Electra boards

Driver for the CompactFlash slot on the PA Semi Electra eval board. It's
a simple device sitting on localbus, with interrupts and detect/voltage
control over GPIO.

The driver is implemented as an of_platform driver, and adds localbus
as a bus being probed by the of_platform framework.

[akpm@linux-foundation.org: cleanups]
[olof@lixom.net: fix build]
Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Milton Miller <miltonm@bga.com>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c
index 5ddf40a66a..3a5d112af5 100644
--- a/arch/powerpc/platforms/pasemi/setup.c
+++ b/arch/powerpc/platforms/pasemi/setup.c
@@ -37,6 +37,10 @@
 #include <asm/time.h>
 #include <asm/of_platform.h>
 
+#include <pcmcia/ss.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+
 #include "pasemi.h"
 
 /* SDC reset register, must be pre-mapped at reset time */
@@ -308,7 +312,57 @@ static void __init pas_init_early(void)
         iommu_init_early_pasemi();
 }
 
+#ifdef CONFIG_PCMCIA
+static int pcmcia_notify(struct notifier_block *nb, unsigned long action,
+                         void *data)
+{
+        struct device *dev = data;
+        struct device *parent;
+        struct pcmcia_device *pdev = to_pcmcia_dev(dev);
+
+        /* We are only intereted in device addition */
+        if (action != BUS_NOTIFY_ADD_DEVICE)
+                return 0;
+
+        parent = pdev->socket->dev.parent;
+
+        /* We know electra_cf devices will always have of_node set, since
+         * electra_cf is an of_platform driver.
+         */
+        if (!parent->archdata.of_node)
+                return 0;
+
+        if (!of_device_is_compatible(parent->archdata.of_node, "electra-cf"))
+                return 0;
+
+        /* We use the direct ops for localbus */
+        dev->archdata.dma_ops = &dma_direct_ops;
+
+        return 0;
+}
+
+static struct notifier_block pcmcia_notifier = {
+        .notifier_call = pcmcia_notify,
+};
+
+static inline void pasemi_pcmcia_init(void)
+{
+        extern struct bus_type pcmcia_bus_type;
+
+        bus_register_notifier(&pcmcia_bus_type, &pcmcia_notifier);
+}
+
+#else
+
+static inline void pasemi_pcmcia_init(void)
+{
+}
+
+#endif
+
+
 static struct of_device_id pasemi_bus_ids[] = {
+        { .type = "localbus", },
         { .type = "sdc", },
         {},
 };
@@ -318,6 +372,8 @@ static int __init pasemi_publish_devices(void)
         if (!machine_is(pasemi))
                 return 0;
 
+        pasemi_pcmcia_init();
+
         /* Publish OF platform devices for SDC and other non-PCI devices */
         of_platform_bus_probe(NULL, pasemi_bus_ids, NULL);