1 files changed, 62 insertions, 0 deletions
diff --git a/board/tcm-bf537/gpio_cfi_flash.c b/board/tcm-bf537/gpio_cfi_flash.c
new file mode 100644
index 0000000..7137d12
--- /dev/null
+++ b/board/tcm-bf537/gpio_cfi_flash.c
@@ -0,0 +1,62 @@
+/*
+ * gpio_cfi_flash.c - GPIO-assisted Flash Chip Support
+ *
+ * Copyright (c) 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <asm/blackfin.h>
+#include <asm/io.h>
+#include "gpio_cfi_flash.h"
+
+#define GPIO_PIN_1  PF4
+#define GPIO_MASK_1 (1 << 21)
+#define GPIO_PIN_2  PF5
+#define GPIO_MASK_2 (1 << 22)
+#define GPIO_MASK   (GPIO_MASK_1 | GPIO_MASK_2)
+
+void *gpio_cfi_flash_swizzle(void *vaddr)
+{
+	unsigned long addr = (unsigned long)vaddr;
+
+	if (addr & GPIO_MASK_1)
+		bfin_write_PORTFIO_SET(GPIO_PIN_1);
+	else
+		bfin_write_PORTFIO_CLEAR(GPIO_PIN_1);
+
+#ifdef GPIO_MASK_2
+	if (addr & GPIO_MASK_2)
+		bfin_write_PORTFIO_SET(GPIO_PIN_2);
+	else
+		bfin_write_PORTFIO_CLEAR(GPIO_PIN_2);
+#endif
+
+	SSYNC();
+
+	return (void *)(addr & ~GPIO_MASK);
+}
+
+#define __raw_writeq(value, addr) *(volatile u64 *)addr = value
+#define __raw_readq(addr) *(volatile u64 *)addr
+
+#define MAKE_FLASH(size, sfx) \
+void flash_write##size(u##size value, void *addr) \
+{ \
+	__raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \
+} \
+u##size flash_read##size(void *addr) \
+{ \
+	return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \
+}
+MAKE_FLASH(8, b)  /* flash_write8()  flash_read8() */
+MAKE_FLASH(16, w) /* flash_write16() flash_write16() */
+MAKE_FLASH(32, l) /* flash_write32() flash_write32() */
+MAKE_FLASH(64, q) /* flash_write64() flash_write64() */
+
+void gpio_cfi_flash_init(void)
+{
+	bfin_write_PORTFIO_DIR(bfin_read_PORTFIO_DIR() | GPIO_PIN_1 | GPIO_PIN_2);
+	gpio_cfi_flash_swizzle((void *)CONFIG_SYS_FLASH_BASE);
+}