bootstd: Add a SPI flash bootdev
Add a bootdev for SPI flash so that these devices can be used with
standard boot. It only supports loading a script.
Add a special case for the label, since we want to use "spi", not
"spi_flash".
Enable the new bootdev on sandbox.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index 7b858a3..a9617c6 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -80,6 +80,14 @@
if SPI_FLASH
+config BOOTDEV_SPI_FLASH
+ bool "SPI Flash bootdev support"
+ help
+ Enable a boot device for SPI flash. This allows reading a script
+ from SPI flash so that it can be used to boot an Operating System.
+
+ If unsure, say N
+
config SPI_FLASH_SFDP_SUPPORT
bool "SFDP table parsing support for SPI NOR flashes"
depends on !SPI_FLASH_BAR
diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index 99cc418..4093953 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -21,3 +21,4 @@
obj-$(CONFIG_SPI_FLASH_DATAFLASH) += sf_dataflash.o
obj-$(CONFIG_$(SPL_TPL_)SPI_FLASH_MTD) += sf_mtd.o
obj-$(CONFIG_SPI_FLASH_SANDBOX) += sandbox.o
+obj-$(CONFIG_$(SPL_TPL_)BOOTDEV_SPI_FLASH) += sf_bootdev.o
diff --git a/drivers/mtd/spi/sf-uclass.c b/drivers/mtd/spi/sf-uclass.c
index e6e650e..df1f753 100644
--- a/drivers/mtd/spi/sf-uclass.c
+++ b/drivers/mtd/spi/sf-uclass.c
@@ -6,6 +6,7 @@
#define LOG_CATEGORY UCLASS_SPI_FLASH
#include <common.h>
+#include <bootdev.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
@@ -13,6 +14,7 @@
#include <spi_flash.h>
#include <asm/global_data.h>
#include <dm/device-internal.h>
+#include <test/test.h>
#include "sf_internal.h"
DECLARE_GLOBAL_DATA_PTR;
@@ -86,6 +88,14 @@
static int spi_flash_post_bind(struct udevice *dev)
{
+ int ret;
+
+ if (CONFIG_IS_ENABLED(BOOTDEV_SPI_FLASH) && test_sf_bootdev_enabled()) {
+ ret = bootdev_setup_for_dev(dev, "sf_bootdev");
+ if (ret)
+ return log_msg_ret("bd", ret);
+ }
+
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
struct dm_spi_flash_ops *ops = sf_get_ops(dev);
static int reloc_done;
@@ -101,6 +111,7 @@
reloc_done++;
}
#endif
+
return 0;
}
diff --git a/drivers/mtd/spi/sf_bootdev.c b/drivers/mtd/spi/sf_bootdev.c
new file mode 100644
index 0000000..2272e85
--- /dev/null
+++ b/drivers/mtd/spi/sf_bootdev.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Read a bootflow from SPI flash
+ *
+ * Copyright 2022 Google LLC
+ */
+
+#include <common.h>
+#include <bootdev.h>
+#include <bootflow.h>
+#include <bootmeth.h>
+#include <dm.h>
+#include <env.h>
+#include <malloc.h>
+#include <spi_flash.h>
+
+static int sf_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
+ struct bootflow *bflow)
+{
+ struct udevice *sf = dev_get_parent(dev);
+ uint size;
+ char *buf;
+ int ret;
+
+ /* We only support the whole device, not partitions */
+ if (iter->part)
+ return log_msg_ret("max", -ESHUTDOWN);
+
+ size = env_get_hex("script_size_f", 0);
+ if (!size)
+ return log_msg_ret("sz", -EINVAL);
+
+ buf = malloc(size + 1);
+ if (!buf)
+ return log_msg_ret("buf", -ENOMEM);
+
+ ret = spi_flash_read_dm(sf, env_get_hex("script_offset_f", 0),
+ size, buf);
+ if (ret)
+ return log_msg_ret("cmd", -EINVAL);
+ bflow->state = BOOTFLOWST_MEDIA;
+
+ ret = bootmeth_set_bootflow(bflow->method, bflow, buf, size);
+ if (ret) {
+ free(buf);
+ return log_msg_ret("method", ret);
+ }
+
+ return 0;
+}
+
+static int sf_bootdev_bind(struct udevice *dev)
+{
+ struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
+
+ ucp->prio = BOOTDEVP_2_SCAN_FAST;
+
+ return 0;
+}
+
+struct bootdev_ops sf_bootdev_ops = {
+ .get_bootflow = sf_get_bootflow,
+};
+
+static const struct udevice_id sf_bootdev_ids[] = {
+ { .compatible = "u-boot,bootdev-sf" },
+ { }
+};
+
+U_BOOT_DRIVER(sf_bootdev) = {
+ .name = "sf_bootdev",
+ .id = UCLASS_BOOTDEV,
+ .ops = &sf_bootdev_ops,
+ .bind = sf_bootdev_bind,
+ .of_match = sf_bootdev_ids,
+};
+
+BOOTDEV_HUNTER(sf_bootdev_hunter) = {
+ .prio = BOOTDEVP_2_SCAN_FAST,
+ .uclass = UCLASS_SPI_FLASH,
+ .drv = DM_DRIVER_REF(sf_bootdev),
+};