bcma: detect and register NAND flash device

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/bcma/Kconfig

@@ -53,7 +53,7 @@ config BCMA_SFLASH
 
 config BCMA_NFLASH
 	bool
-	depends on BCMA_DRIVER_MIPS && BROKEN
+	depends on BCMA_DRIVER_MIPS
 	default y
 
 config BCMA_DRIVER_GMAC_CMN

drivers/bcma/bcma_private.h

@@ -66,6 +66,7 @@ static inline int bcma_sflash_init(struct bcma_drv_cc *cc)
 #ifdef CONFIG_BCMA_NFLASH
 /* driver_chipcommon_nflash.c */
 int bcma_nflash_init(struct bcma_drv_cc *cc);
+extern struct platform_device bcma_nflash_dev;
 #else
 static inline int bcma_nflash_init(struct bcma_drv_cc *cc)
 {

drivers/bcma/driver_chipcommon_nflash.c

@@ -5,15 +5,37 @@
  * Licensed under the GNU/GPL. See COPYING for details.
  */
 
+#include <linux/platform_device.h>
 #include <linux/bcma/bcma.h>
-#include <linux/bcma/bcma_driver_chipcommon.h>
-#include <linux/delay.h>
 
 #include "bcma_private.h"
 
+struct platform_device bcma_nflash_dev = {
+	.name		= "bcma_nflash",
+	.num_resources	= 0,
+};
+
 /* Initialize NAND flash access */
 int bcma_nflash_init(struct bcma_drv_cc *cc)
 {
-	bcma_err(cc->core->bus, "NAND flash support is broken\n");
+	struct bcma_bus *bus = cc->core->bus;
+
+	if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4706 &&
+	    cc->core->id.rev != 0x38) {
+		bcma_err(bus, "NAND flash on unsupported board!\n");
+		return -ENOTSUPP;
+	}
+
+	if (!(cc->capabilities & BCMA_CC_CAP_NFLASH)) {
+		bcma_err(bus, "NAND flash not present according to ChipCommon\n");
+		return -ENODEV;
+	}
+
+	cc->nflash.present = true;
+
+	/* Prepare platform device, but don't register it yet. It's too early,
+	 * malloc (required by device_private_init) is not available yet. */
+	bcma_nflash_dev.dev.platform_data = &cc->nflash;
+
 	return 0;
 }

drivers/bcma/main.c

@@ -145,6 +145,14 @@ static int bcma_register_cores(struct bcma_bus *bus)
 	}
 #endif
 
+#ifdef CONFIG_BCMA_NFLASH
+	if (bus->drv_cc.nflash.present) {
+		err = platform_device_register(&bcma_nflash_dev);
+		if (err)
+			bcma_err(bus, "Error registering NAND flash\n");
+	}
+#endif
+
 	return 0;
 }
 

include/linux/bcma/bcma_driver_chipcommon.h

@@ -519,6 +519,16 @@ struct bcma_sflash {
 };
 #endif
 
+#ifdef CONFIG_BCMA_NFLASH
+struct mtd_info;
+
+struct bcma_nflash {
+	bool present;
+
+	struct mtd_info *mtd;
+};
+#endif
+
 struct bcma_serial_port {
 	void *regs;
 	unsigned long clockspeed;
@@ -542,6 +552,9 @@ struct bcma_drv_cc {
 #ifdef CONFIG_BCMA_SFLASH
 	struct bcma_sflash sflash;
 #endif
+#ifdef CONFIG_BCMA_NFLASH
+	struct bcma_nflash nflash;
+#endif
 
 	int nr_serial_ports;
 	struct bcma_serial_port serial_ports[4];