[U-Boot] [PATCH v3 19/29] dm: sf: Add a uclass for SPI flash
Simon Glass
sjg at chromium.org
Mon Sep 29 21:35:16 CEST 2014
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 at chromium.org>
---
Changes in v3: None
Changes in v2: None
drivers/mtd/spi/Makefile | 7 ++++-
drivers/mtd/spi/sf-uclass.c | 63 ++++++++++++++++++++++++++++++++++++++++
include/dm/uclass-id.h | 1 +
include/spi_flash.h | 70 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 140 insertions(+), 1 deletion(-)
create mode 100644 drivers/mtd/spi/sf-uclass.c
diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index 9e18fb4..15789a0 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -5,13 +5,18 @@
# SPDX-License-Identifier: GPL-2.0+
#
+obj-$(CONFIG_DM_SPI_FLASH) += sf-uclass.o
+
ifdef CONFIG_SPL_BUILD
obj-$(CONFIG_SPL_SPI_LOAD) += spi_spl_load.o
obj-$(CONFIG_SPL_SPI_BOOT) += fsl_espi_spl.o
endif
+#ifndef CONFIG_DM_SPI
+obj-$(CONFIG_SPI_FLASH) += sf_probe.o
+#endif
obj-$(CONFIG_CMD_SF) += sf.o
-obj-$(CONFIG_SPI_FLASH) += sf_params.o sf_probe.o sf_ops.o
+obj-$(CONFIG_SPI_FLASH) += sf_ops.o sf_params.o
obj-$(CONFIG_SPI_FRAM_RAMTRON) += ramtron.o
obj-$(CONFIG_SPI_FLASH_SANDBOX) += sandbox.o
obj-$(CONFIG_SPI_M95XXX) += eeprom_m95xxx.o
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 at 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),
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 6e56382..c92adb4 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -25,6 +25,7 @@ enum uclass_id {
UCLASS_SERIAL, /* Serial UART */
UCLASS_SPI, /* SPI bus */
UCLASS_SPI_GENERIC, /* Generic SPI flash target */
+ UCLASS_SPI_FLASH, /* SPI flash */
UCLASS_COUNT,
UCLASS_INVALID = -1,
diff --git a/include/spi_flash.h b/include/spi_flash.h
index 223e442..5913b39 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -15,6 +15,7 @@
#ifndef _SPI_FLASH_H_
#define _SPI_FLASH_H_
+#include <dm.h> /* Because we dereference struct udevice here */
#include <linux/types.h>
#ifndef CONFIG_SF_DEFAULT_SPEED
@@ -61,7 +62,12 @@ struct spi_slave;
* return 0 - Success, 1 - Failure
*/
struct spi_flash {
+#ifdef CONFIG_DM_SPI_FLASH
struct spi_slave *spi;
+ struct udevice *dev;
+#else
+ struct spi_slave *spi;
+#endif
const char *name;
u8 dual_flash;
u8 shift;
@@ -82,12 +88,75 @@ struct spi_flash {
u8 dummy_byte;
void *memory_map;
+#ifndef CONFIG_DM_SPI_FLASH
+ /*
+ * These are not strictly needed for driver model, but keep them here
+ * whilt the transition is in progress.
+ *
+ * Normally each driver would provide its own operations, but for
+ * SPI flash most chips use the same algorithms. One approach is
+ * to create a 'common' SPI flash device which knows how to talk
+ * to most devices, and then allow other drivers to be used instead
+ * if requird, perhaps with a way of scanning through the list to
+ * find the driver that matches the device.
+ */
int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);
int (*write)(struct spi_flash *flash, u32 offset, size_t len,
const void *buf);
int (*erase)(struct spi_flash *flash, u32 offset, size_t len);
+#endif
+};
+
+struct dm_spi_flash_ops {
+ int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf);
+ int (*write)(struct udevice *dev, u32 offset, size_t len,
+ const void *buf);
+ int (*erase)(struct udevice *dev, u32 offset, size_t len);
};
+/* Access the serial operations for a device */
+#define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
+
+#ifdef CONFIG_DM_SPI_FLASH
+int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
+ unsigned int max_hz, unsigned int spi_mode,
+ struct udevice **devp);
+
+/* Compatibility function - this is the old U-Boot API */
+struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int spi_mode);
+
+/* Compatibility function - this is the old U-Boot API */
+void spi_flash_free(struct spi_flash *flash);
+
+int spi_flash_remove(struct udevice *flash);
+
+static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
+ size_t len, void *buf)
+{
+ return sf_get_ops(flash->dev)->read(flash->dev, offset, len, buf);
+}
+
+static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
+ size_t len, const void *buf)
+{
+ return sf_get_ops(flash->dev)->write(flash->dev, offset, len, buf);
+}
+
+static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
+ size_t len)
+{
+ return sf_get_ops(flash->dev)->erase(flash->dev, offset, len);
+}
+
+struct sandbox_state;
+
+int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
+ struct udevice *bus, int of_offset, const char *spec);
+
+void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs);
+
+#else
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int spi_mode);
@@ -122,6 +191,7 @@ static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
{
return flash->erase(flash, offset, len);
}
+#endif
void spi_boot(void) __noreturn;
void spi_spl_load_image(uint32_t offs, unsigned int size, void *vdst);
--
2.1.0.rc2.206.gedb03e5
More information about the U-Boot
mailing list