dm: sf: Add a uclass for SPI flash

Add a driver model uclass for SPI flash which supports the common
operations (read, write, erase). Since we must keep support for the
non-dm interface, some modification of the spi_flash header is required.

CONFIG_DM_SPI_FLASH is used to enable driver model for SPI flash.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/drivers/mtd/spi/sf-uclass.c b/drivers/mtd/spi/sf-uclass.c
new file mode 100644
index 0000000..376d815
--- /dev/null
+++ b/drivers/mtd/spi/sf-uclass.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <dm/device-internal.h>
+#include "sf_internal.h"
+
+/*
+ * TODO(sjg@chromium.org): This is an old-style function. We should remove
+ * it when all SPI flash drivers use dm
+ */
+struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
+				  unsigned int max_hz, unsigned int spi_mode)
+{
+	struct udevice *dev;
+
+	if (spi_flash_probe_bus_cs(bus, cs, max_hz, spi_mode, &dev))
+		return NULL;
+
+	return dev->uclass_priv;
+}
+
+void spi_flash_free(struct spi_flash *flash)
+{
+	spi_flash_remove(flash->spi->dev);
+}
+
+int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
+			   unsigned int max_hz, unsigned int spi_mode,
+			   struct udevice **devp)
+{
+	struct spi_slave *slave;
+	struct udevice *bus;
+	char name[20], *str;
+	int ret;
+
+	snprintf(name, sizeof(name), "%d:%d", busnum, cs);
+	str = strdup(name);
+	ret = spi_get_bus_and_cs(busnum, cs, max_hz, spi_mode,
+				  "spi_flash_std", str, &bus, &slave);
+	if (ret)
+		return ret;
+
+	*devp = slave->dev;
+	return 0;
+}
+
+int spi_flash_remove(struct udevice *dev)
+{
+	return device_remove(dev);
+}
+
+UCLASS_DRIVER(spi_flash) = {
+	.id		= UCLASS_SPI_FLASH,
+	.name		= "spi_flash",
+	.per_device_auto_alloc_size = sizeof(struct spi_flash),
+};