[PATCH v4 0/6] Support UEFI SPI I/O protocol

[PATCH v4 0/6] Support UEFI SPI I/O protocol

[Paul Barker]

These patches add support for the UEFI SPI I/O protocol defined in the
UEFI Platform Initialization (PI) Specification, Version 1.7 Errata A
(April 2020). This allows a UEFI application to interact with devices
on the SPI bus.

This support is initially intended to be used to communicate with SPI
devices from "pre-boot" UEFI applications which perform setup before
the main OS is loaded. Other use cases may also be supported, however
this is not intended to be a replacement for UEFI capsule updates.

The "pre-boot" UEFI application which we are currently developing will
interact with a Micron Authenta[1] flash device, sending vendor-specific
commands over the SPI bus to make use of Authenta security features, to
verify flash integrity and to generate ephemeral keys based on the flash
contents.

The code here is self-contained and easy to enable/disable at compile
time. Compilation testing with am335x_evm_defconfig shows that the size
of u-boot.img increases by less than 2kB when CONFIG_EFI_SPI_PROTOCOL
is enabled.

[1]: https://www.micron.com/-/media/client/global/documents/products/product-flyer/authenta_technology_solutions_brief.pdf

Changes since v3:

* Add implementation of spi_set_speed() so we can use this in
  efi_spi_io_transaction().

* Rename convert_efi_string() to efi_convert_string() and move to
  efi_string.c as a common helper function.

* Call spi_set_speed() instead of manually de-referencing the function
  pointer in struct dm_spi_ops.

* Don't call efi_delete_handle() in destroy_efi_spi_peripheral().

* Use '%pUl' to print guid string.

* Split efi_selftest changes into a separate patch.

Changes since v2:

* Added description to efi_spi_protocol.h.

* Moved definition of EFI_SPI_CONFIGURATION_GUID to efi_api.h and
  added it to the list in lib/uuid.c.

* Fixed UEFI GUID byte order in test.dts and in debug output.

* Use log_debug() instead of printf() for debug output.

* Add test cases to confirm that efi_legacy_spi_controller_protocol
  functions return EFI_UNSUPPORTED (as they are not currently
  implemented)

Changes since v1:

* Skip emulated SPI peripherals. These appear as duplicates within the
  list of devices on the bus when using the sandbox SPI drivers.

* Make most printf statements debug only.

* Add efi_seltest unit test.

* Do not enable config EFI_SPI_PROTOCOL by default.

* Mark functions with EFIAPI where necessary.

* Handle debug_transaction argument to efi_spi_io_transaction().

* Handle a value of zero for target->max_read_size &
  target->max_write_size.

* Probe inactive SPI devices when initializing the EFI SPI protocol to
  ensure that dev_get_parent_priv() returns valid data and the exported
  devices are ready to use.

Paul Barker (6):
  spi: Implement spi_set_speed
  efi: Add string conversion helper
  efi_loader: Add SPI I/O protocol support
  efi_selftest: Add tests for SPI protocol support
  arm: dts: am335x-sancloud-bbe-lite: UEFI SPI export
  am335x_evm_defconfig: Enable Micron SPI flash support

 MAINTAINERS                                  |   7 +
 arch/arm/dts/am335x-sancloud-bbe-lite.dts    |  10 +-
 arch/sandbox/dts/test.dts                    |  13 +
 configs/am335x_evm_defconfig                 |   1 +
 drivers/spi/spi-uclass.c                     |  15 +
 include/efi_api.h                            |   4 +
 include/efi_loader.h                         |   7 +-
 include/efi_spi_protocol.h                   | 166 ++++++
 include/spi.h                                |   2 +-
 lib/efi_loader/Kconfig                       |   8 +
 lib/efi_loader/Makefile                      |   1 +
 lib/efi_loader/efi_setup.c                   |   6 +
 lib/efi_loader/efi_spi_protocol.c            | 590 +++++++++++++++++++
 lib/efi_loader/efi_string.c                  |  24 +
 lib/efi_selftest/Makefile                    |   1 +
 lib/efi_selftest/efi_selftest_spi_protocol.c | 284 +++++++++
 lib/uuid.c                                   |   4 +
 17 files changed, 1139 insertions(+), 4 deletions(-)
 create mode 100644 include/efi_spi_protocol.h
 create mode 100644 lib/efi_loader/efi_spi_protocol.c
 create mode 100644 lib/efi_selftest/efi_selftest_spi_protocol.c

-- 
2.25.1

[PATCH v4 1/6] spi: Implement spi_set_speed

[Paul Barker]

This function is already defined in spi.h but no implementation of it
currently exists in the tree. The implementation is based on the static
function spi_set_speed_mode(). The function prototype is modified so
that an success or error condition can be returned to the caller.

Signed-off-by: Paul Barker <paul.barker@sancloud.com>
---
 drivers/spi/spi-uclass.c | 15 +++++++++++++++
 include/spi.h            |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index f2791c4b88ec..c929e7c1d0e9 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -130,6 +130,21 @@ void spi_release_bus(struct spi_slave *slave)
 	dm_spi_release_bus(slave->dev);
 }
 
+int spi_set_speed(struct spi_slave *slave, uint hz)
+{
+	struct dm_spi_ops *ops;
+	int ret;
+
+	ops = spi_get_ops(slave->dev->parent);
+	if (ops->set_speed)
+		ret = ops->set_speed(slave->dev->parent, hz);
+	else
+		ret = -EINVAL;
+	if (ret)
+		dev_err(slave->dev, "Cannot set speed (err=%d)\n", ret);
+	return ret;
+}
+
 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	     const void *dout, void *din, unsigned long flags)
 {
diff --git a/include/spi.h b/include/spi.h
index 9a8c1fb260e6..de97ffb4c385 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -353,7 +353,7 @@ void spi_cs_deactivate(struct spi_slave *slave);
  * @slave:	The SPI slave
  * @hz:		The transfer speed
  */
-void spi_set_speed(struct spi_slave *slave, uint hz);
+int spi_set_speed(struct spi_slave *slave, uint hz);
 
 /**
  * Write 8 bits, then read 8 bits.
-- 
2.25.1

[PATCH v4 2/6] efi: Add string conversion helper

[Paul Barker]

Signed-off-by: Paul Barker <paul.barker@sancloud.com>
---
 include/efi_loader.h        |  3 ++-
 lib/efi_loader/efi_string.c | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 545ba06d9466..4dbbb2d3a06c 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -985,9 +985,10 @@ struct pkcs7_message *efi_parse_pkcs7_header(const void *buf,
 /* runtime implementation of memcpy() */
 void efi_memcpy_runtime(void *dest, const void *src, size_t n);
 
-/* commonly used helper function */
+/* commonly used helper functions */
 u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
 			     unsigned int index);
+efi_string_t efi_convert_string(const char *str);
 
 extern const struct efi_firmware_management_protocol efi_fmp_fit;
 extern const struct efi_firmware_management_protocol efi_fmp_raw;
diff --git a/lib/efi_loader/efi_string.c b/lib/efi_loader/efi_string.c
index 8bf1e493b89e..e21e09c94617 100644
--- a/lib/efi_loader/efi_string.c
+++ b/lib/efi_loader/efi_string.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <charset.h>
 #include <efi_loader.h>
+#include <malloc.h>
 
 /**
  * efi_create_indexed_name - create a string name with an index
@@ -41,3 +42,26 @@ u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
 
 	return p;
 }
+
+/**
+ * efi_convert_string - Convert an ASCII or UTF-8 string to UTF-16
+ * @str:	String to be converted
+ *
+ * Return: Converted string in UTF-16 format. The caller is responsible for
+ *         freeing this string when it is no longer needed.
+ */
+efi_string_t efi_convert_string(const char *str)
+{
+	efi_string_t str_16, tmp;
+	size_t sz_16;
+
+	sz_16 = utf8_utf16_strlen(str);
+	str_16 = calloc(sz_16 + 1, sizeof(u16));
+	if (!str_16)
+		return NULL;
+
+	tmp = str_16;
+	utf8_utf16_strcpy(&tmp, str);
+
+	return str_16;
+}
-- 
2.25.1

[PATCH v4 3/6] efi_loader: Add SPI I/O protocol support

[Paul Barker]

This addition allows UEFI applications running under u-boot to access
peripherals on SPI busses. It is based on the UEFI Platform
Initialization (PI) Specification, Version 1.7 Errata A (April 2020).
Only the core functionality required to discover SPI peripherals and
communicate with them is currently implemented. Other functionality such
as the legacy SPI controller interface and the ability to update the SPI
peripheral object associated with a particular SPI I/O protocol object
is currently unimplemented.

The following protocols are defined:
* EFI_SPI_CONFIGURATION_PROTOCOL
* EFI_SPI_IO_PROTOCOL
* EFI_LEGACY_SPI_CONTROLLER_PROTOCOL

Since there are no open source implementations of these protocols to use
as an example, educated guesses/hacks have been made in cases where the
UEFI PI specification is unclear and these are documented in comments.

This implementation has been tested on the SanCloud BBE Lite and allowed
a UEFI test application to successfully communicate with a Micron
Authenta flash device connected via the SPI bus.

Signed-off-by: Paul Barker <paul.barker@sancloud.com>
---
 MAINTAINERS                       |   6 +
 include/efi_api.h                 |   4 +
 include/efi_loader.h              |   4 +
 include/efi_spi_protocol.h        | 166 +++++++++
 lib/efi_loader/Kconfig            |   8 +
 lib/efi_loader/Makefile           |   1 +
 lib/efi_loader/efi_setup.c        |   6 +
 lib/efi_loader/efi_spi_protocol.c | 590 ++++++++++++++++++++++++++++++
 lib/uuid.c                        |   4 +
 9 files changed, 789 insertions(+)
 create mode 100644 include/efi_spi_protocol.h
 create mode 100644 lib/efi_loader/efi_spi_protocol.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 83346183ee4b..40b3f1c80daa 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -857,6 +857,12 @@ F:	tools/efivar.py
 F:	tools/file2include.c
 F:	tools/mkeficapsule.c
 
+EFI SPI SUPPORT
+M:	Paul Barker <paul.barker@sancloud.com>
+S:	Maintained
+F:	include/efi_spi_protocol.h
+F:	lib/efi_loader/efi_spi_protocol.c
+
 EFI VARIABLES VIA OP-TEE
 M:	Ilias Apalodimas <ilias.apalodimas@linaro.org>
 S:	Maintained
diff --git a/include/efi_api.h b/include/efi_api.h
index 9bb0d44ac8d5..eebefbe1585a 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -454,6 +454,10 @@ struct efi_runtime_services {
 	EFI_GUID(0x607f766c, 0x7455, 0x42be, 0x93, \
 		 0x0b, 0xe4, 0xd7, 0x6d, 0xb2, 0x72, 0x0f)
 
+#define EFI_SPI_CONFIGURATION_GUID  \
+	EFI_GUID(0x85a6d3e6, 0xb65b, 0x4afc,     \
+		 0xb3, 0x8f, 0xc6, 0xd5, 0x4a, 0xf6, 0xdd, 0xc8)
+
 #define RISCV_EFI_BOOT_PROTOCOL_GUID \
 	EFI_GUID(0xccd15fec, 0x6f73, 0x4eec, 0x83, \
 		 0x95, 0x3e, 0x69, 0xe4, 0xb9, 0x40, 0xbf)
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 4dbbb2d3a06c..18947ac6e94e 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -541,6 +541,10 @@ efi_status_t efi_rng_register(void);
 efi_status_t efi_tcg2_register(void);
 /* Called by efi_init_obj_list() to install RISCV_EFI_BOOT_PROTOCOL */
 efi_status_t efi_riscv_register(void);
+/* Called by efi_init_obj_list() to install EFI_SPI_CONFIGURATION_PROTOCOL &
+ * EFI_SPI_IO_PROTOCOL
+ */
+efi_status_t efi_spi_protocol_register(void);
 /* Called by efi_init_obj_list() to do initial measurement */
 efi_status_t efi_tcg2_do_initial_measurement(void);
 /* measure the pe-coff image, extend PCR and add Event Log */
diff --git a/include/efi_spi_protocol.h b/include/efi_spi_protocol.h
new file mode 100644
index 000000000000..1a247a6a6f85
--- /dev/null
+++ b/include/efi_spi_protocol.h
@@ -0,0 +1,166 @@
+/* SPDX-License-Identifier: BSD-2-Clause-Patent */
+/*
+ * Copyright (c) 2017, Intel Corporation. All rights reserved.
+ * Copyright (c) 2022 Micron Technology, Inc.
+ *
+ * This header is based on code from EDK II, with modifications to match the
+ * u-boot coding style. It defines data structures for the following protocols
+ * found in the UEFI Platform Initialization (PI) Specification, version 1.7
+ * errata A:
+ *
+ *    - EFI_SPI_CONFIGURATION_PROTOCOL
+ *    - EFI_SPI_IO_PROTOCOL
+ *    - EFI_LEGACY_SPI_CONTROLLER_PROTOCOL (required by the I/O protocol as the
+ *      spec does not appear to allow the legacy_spi_protocol pointer to be NULL
+ *      in struct efi_spi_io_protocol)
+ */
+
+#ifndef _EFI_SPI_PROTOCOL_H
+#define _EFI_SPI_PROTOCOL_H
+
+#include <efi.h>
+#include <efi_api.h>
+
+struct efi_spi_peripheral;
+
+struct efi_spi_part {
+	efi_string_t vendor;
+	efi_string_t part_number;
+	u32 min_clock_hz;
+	u32 max_clock_hz;
+	bool chip_select_polarity;
+};
+
+struct efi_spi_bus {
+	efi_string_t friendly_name;
+	struct efi_spi_peripheral *peripheral_list;
+	struct efi_device_path *controller_path;
+
+	efi_status_t
+	(EFIAPI * clock)(const struct efi_spi_peripheral *spi_peripheral,
+		u32 *clock_hz);
+
+	void *clock_parameter;
+};
+
+struct efi_spi_peripheral {
+	struct efi_spi_peripheral *next_spi_peripheral;
+	efi_string_t friendly_name;
+	efi_guid_t *spi_peripheral_driver_guid;
+	struct efi_spi_part *spi_part;
+	u32 max_clock_hz;
+	bool clock_polarity;
+	bool clock_phase;
+	u32 attributes;
+	void *configuration_data;
+	struct efi_spi_bus *spi_bus;
+
+	efi_status_t
+	(EFIAPI * chip_select)(const struct efi_spi_peripheral *spi_peripheral,
+		bool pin_value);
+
+	void *chip_select_parameter;
+};
+
+struct efi_spi_configuration_protocol {
+	u32 bus_count;
+	struct efi_spi_bus **bus_list;
+};
+
+#define EFI_LEGACY_SPI_CONTROLLER_GUID  \
+	EFI_GUID(0x39136fc7, 0x1a11, 0x49de,         \
+		 0xbf, 0x35, 0x0e, 0x78, 0xdd, 0xb5, 0x24, 0xfc)
+
+struct efi_legacy_spi_controller_protocol;
+
+struct efi_legacy_spi_controller_protocol {
+	u32 maximum_offset;
+	u32 maximum_range_bytes;
+	u32 range_register_count;
+
+	efi_status_t
+	(EFIAPI * erase_block_opcode)(const struct efi_legacy_spi_controller_protocol *this,
+		u8 erase_block_opcode);
+
+	efi_status_t
+	(EFIAPI * write_status_prefix)(const struct efi_legacy_spi_controller_protocol *this,
+		u8 write_status_prefix);
+
+	efi_status_t
+	(EFIAPI * bios_base_address)(const struct efi_legacy_spi_controller_protocol *this,
+		u32 bios_base_address);
+
+	efi_status_t
+	(EFIAPI * clear_spi_protect)(const struct efi_legacy_spi_controller_protocol *this);
+
+	bool
+	(EFIAPI * is_range_protected)(const struct efi_legacy_spi_controller_protocol *this,
+		u32 bios_address,
+		u32 blocks_to_protect);
+
+	efi_status_t
+	(EFIAPI * protect_next_range)(const struct efi_legacy_spi_controller_protocol *this,
+		u32 bios_address,
+		u32 blocks_to_protect);
+
+	efi_status_t
+	(EFIAPI * lock_controller)(const struct efi_legacy_spi_controller_protocol *this);
+};
+
+struct efi_spi_io_protocol;
+
+enum efi_spi_transaction_type {
+	SPI_TRANSACTION_FULL_DUPLEX,
+	SPI_TRANSACTION_WRITE_ONLY,
+	SPI_TRANSACTION_READ_ONLY,
+	SPI_TRANSACTION_WRITE_THEN_READ
+};
+
+struct efi_spi_bus_transaction {
+	struct efi_spi_peripheral *spi_peripheral;
+	enum efi_spi_transaction_type transaction_type;
+	bool debug_transaction;
+	u32 bus_width;
+	u32 frame_size;
+	u32 write_bytes;
+	u8 *write_buffer;
+	u32 read_bytes;
+	u8 *read_buffer;
+};
+
+struct efi_spi_io_protocol {
+	struct efi_spi_peripheral *spi_peripheral;
+	struct efi_spi_peripheral *original_spi_peripheral;
+	u32 frame_size_support_mask;
+	u32 maximum_transfer_bytes;
+	u32 attributes;
+	struct efi_legacy_spi_controller_protocol *legacy_spi_protocol;
+
+	efi_status_t
+	(EFIAPI * transaction)(const struct efi_spi_io_protocol *this,
+		enum efi_spi_transaction_type transaction_type,
+		bool debug_transaction,
+		u32 clock_hz,
+		u32 bus_width,
+		u32 frame_size,
+		u32 write_bytes,
+		u8 *write_buffer,
+		u32 read_bytes,
+		u8 *read_buffer);
+
+	efi_status_t
+	(EFIAPI * update_spi_peripheral)(struct efi_spi_io_protocol *this,
+		struct efi_spi_peripheral *spi_peripheral);
+};
+
+struct efi_spi_peripheral_priv {
+	struct efi_spi_peripheral peripheral;
+	struct efi_spi_part part;
+	struct efi_spi_io_protocol io_protocol;
+	efi_handle_t handle;
+	struct spi_slave *target;
+};
+
+efi_status_t efi_spi_protocol_register(void);
+
+#endif
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index b8fb2701a74e..a9533eac4cbc 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -412,4 +412,12 @@ config EFI_RISCV_BOOT_PROTOCOL
 	  replace the transfer via the device-tree. The latter is not
 	  possible on systems using ACPI.
 
+config EFI_SPI_PROTOCOL
+	bool "EFI SPI protocol support"
+	depends on DM_SPI
+	help
+	  Provide implementations of EFI_SPI_CONFIGURATION_PROTOCOL and
+	  EFI_SPI_IO_PROTOCOL to allow UEFI applications to access devices
+	  connected via SPI bus.
+
 endif
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index e187d2a914f9..8b77dddfbb8e 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -74,6 +74,7 @@ obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += efi_smbios.o
 obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_rng.o
 obj-$(CONFIG_EFI_TCG2_PROTOCOL) += efi_tcg2.o
 obj-$(CONFIG_EFI_RISCV_BOOT_PROTOCOL) += efi_riscv.o
+obj-$(CONFIG_EFI_SPI_PROTOCOL) += efi_spi_protocol.o
 obj-$(CONFIG_EFI_LOAD_FILE2_INITRD) += efi_load_initrd.o
 obj-$(CONFIG_EFI_SIGNATURE_SUPPORT) += efi_signature.o
 obj-$(CONFIG_EFI_ECPT) += efi_conformance.o
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index c633fcd91e35..1fb7f6497b1a 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -309,6 +309,12 @@ efi_status_t efi_init_obj_list(void)
 			goto out;
 	}
 
+	if (IS_ENABLED(CONFIG_EFI_SPI_PROTOCOL)) {
+		ret = efi_spi_protocol_register();
+		if (ret != EFI_SUCCESS)
+			goto out;
+	}
+
 	/* Secure boot */
 	ret = efi_init_secure_boot();
 	if (ret != EFI_SUCCESS)
diff --git a/lib/efi_loader/efi_spi_protocol.c b/lib/efi_loader/efi_spi_protocol.c
new file mode 100644
index 000000000000..612772fce2a5
--- /dev/null
+++ b/lib/efi_loader/efi_spi_protocol.c
@@ -0,0 +1,590 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2022 Micron Technology, Inc.
+ */
+
+#define LOG_CATEGORY LOGC_EFI
+
+#include <common.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/read.h>
+#include <efi.h>
+#include <efi_loader.h>
+#include <efi_spi_protocol.h>
+#include <malloc.h>
+#include <spi.h>
+
+static void dump_buffer(const char *msg, u32 length, u8 *buffer)
+{
+	u32 i;
+	EFI_PRINT("%s %d bytes:", msg, length);
+	for (i = 0; i < length; i++)
+		EFI_PRINT(" %02x", buffer[i]);
+	EFI_PRINT("\n");
+}
+
+static efi_status_t EFIAPI
+efi_spi_bus_clock(const struct efi_spi_peripheral *spi_peripheral,
+		  u32 *clock_hz)
+{
+	EFI_ENTRY("%p, %p", spi_peripheral, clock_hz);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+efi_spi_peripheral_chip_select(const struct efi_spi_peripheral *spi_peripheral,
+			       bool pin_value)
+{
+	EFI_ENTRY("%p, %d", spi_peripheral, pin_value);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+legacy_erase_block_opcode(const struct efi_legacy_spi_controller_protocol *this,
+			  u8 erase_block_opcode)
+{
+	EFI_ENTRY("%p, %u", this, erase_block_opcode);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+legacy_write_status_prefix(const struct efi_legacy_spi_controller_protocol *this,
+			   u8 write_status_prefix)
+{
+	EFI_ENTRY("%p, %u", this, write_status_prefix);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+legacy_bios_base_address(const struct efi_legacy_spi_controller_protocol *this,
+			 u32 bios_base_address)
+{
+	EFI_ENTRY("%p, %u", this, bios_base_address);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+legacy_clear_spi_protect(const struct efi_legacy_spi_controller_protocol *this)
+{
+	EFI_ENTRY("%p", this);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static bool EFIAPI
+legacy_is_range_protected(const struct efi_legacy_spi_controller_protocol *this,
+			  u32 bios_address,
+			  u32 blocks_to_protect)
+{
+	EFI_ENTRY("%p, %u, %u", this, bios_address, blocks_to_protect);
+	return EFI_EXIT(false);
+}
+
+static efi_status_t EFIAPI
+legacy_protect_next_range(const struct efi_legacy_spi_controller_protocol *this,
+			  u32 bios_address,
+			  u32 blocks_to_protect)
+{
+	EFI_ENTRY("%p, %u, %u", this, bios_address, blocks_to_protect);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+legacy_lock_controller(const struct efi_legacy_spi_controller_protocol *this)
+{
+	EFI_ENTRY("%p", this);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+efi_spi_io_update_spi_peripheral(struct efi_spi_io_protocol *this,
+				 struct efi_spi_peripheral *spi_peripheral)
+{
+	EFI_ENTRY("%p, %p", this, spi_peripheral);
+	return EFI_EXIT(EFI_UNSUPPORTED);
+}
+
+static efi_status_t EFIAPI
+efi_spi_io_transaction(const struct efi_spi_io_protocol *this,
+		       enum efi_spi_transaction_type transaction_type,
+		       bool debug_transaction,
+		       u32 clock_hz,
+		       u32 bus_width,
+		       u32 frame_size,
+		       u32 write_bytes,
+		       u8 *write_buffer,
+		       u32 read_bytes,
+		       u8 *read_buffer)
+{
+	struct spi_slave *target;
+	efi_status_t status = EFI_SUCCESS;
+	int r;
+
+	/* We ignore the bus_width and frame_size arguments to this function as the
+	 * appropriate bus configuration for the connected device will be performed
+	 * during spi_claim_bus().
+	 */
+
+	/* TODO: Print transaction details if debug_transaction is true. */
+
+	EFI_ENTRY("%p, %u, %u, %u, %u, %u, %u, %p, %u, %p",
+		  this, transaction_type, debug_transaction,
+		  clock_hz, bus_width, frame_size,
+		  write_bytes, write_buffer, read_bytes, read_buffer);
+
+	if (!this)
+		return EFI_EXIT(EFI_INVALID_PARAMETER);
+
+	target = container_of(this, struct efi_spi_peripheral_priv, io_protocol)->target;
+
+	if (clock_hz > this->spi_peripheral->max_clock_hz)
+		return EFI_EXIT(EFI_UNSUPPORTED);
+
+	r = spi_claim_bus(target);
+	if (r != 0)
+		return EFI_EXIT(EFI_DEVICE_ERROR);
+	EFI_PRINT("SPI IO: Bus claimed\n");
+
+	if (clock_hz) {
+		EFI_PRINT("SPI IO: Setting clock rate to %u Hz\n", clock_hz);
+		spi_set_speed(target, clock_hz);
+	} else {
+		EFI_PRINT("SPI IO: Using default clock rate\n");
+	}
+
+	switch (transaction_type) {
+	case SPI_TRANSACTION_FULL_DUPLEX:
+		EFI_PRINT("SPI IO: Full-duplex\n");
+		if (write_bytes != read_bytes || !write_bytes || !write_buffer || !read_buffer) {
+			status = EFI_INVALID_PARAMETER;
+			break;
+		}
+		if (debug_transaction)
+			dump_buffer("SPI IO: write", write_bytes, write_buffer);
+		r = spi_xfer(target, 8 * write_bytes,
+			     write_buffer, read_buffer, SPI_XFER_ONCE);
+		EFI_PRINT("SPI IO: xfer returned %d\n", r);
+		if (debug_transaction)
+			dump_buffer("SPI IO: read", read_bytes, read_buffer);
+		status = (r == 0) ? EFI_SUCCESS : EFI_DEVICE_ERROR;
+		break;
+	case SPI_TRANSACTION_READ_ONLY:
+		EFI_PRINT("SPI IO: Read-only\n");
+		if (!read_bytes || !read_buffer) {
+			status = EFI_INVALID_PARAMETER;
+			break;
+		}
+		r = spi_xfer(target, 8 * read_bytes,
+			     NULL, read_buffer, SPI_XFER_ONCE);
+		EFI_PRINT("SPI IO: xfer returned %d\n", r);
+		if (debug_transaction)
+			dump_buffer("SPI IO: read", read_bytes, read_buffer);
+		status = (r == 0) ? EFI_SUCCESS : EFI_DEVICE_ERROR;
+		break;
+	case SPI_TRANSACTION_WRITE_ONLY:
+		EFI_PRINT("SPI IO: Write-only\n");
+		if (!write_bytes || !write_buffer) {
+			status = EFI_INVALID_PARAMETER;
+			break;
+		}
+		if (debug_transaction)
+			dump_buffer("SPI IO: write", write_bytes, write_buffer);
+		r = spi_xfer(target, 8 * write_bytes,
+			     write_buffer, NULL, SPI_XFER_ONCE);
+		EFI_PRINT("SPI IO: xfer returned %d\n", r);
+		status = (r == 0) ? EFI_SUCCESS : EFI_DEVICE_ERROR;
+		break;
+	case SPI_TRANSACTION_WRITE_THEN_READ:
+		EFI_PRINT("SPI IO: Write-then-read\n");
+		if (!write_bytes || !write_buffer || !read_bytes || !read_buffer) {
+			status = EFI_INVALID_PARAMETER;
+			break;
+		}
+		if (debug_transaction)
+			dump_buffer("SPI IO: write", write_bytes, write_buffer);
+		r = spi_xfer(target, 8 * write_bytes,
+			     write_buffer, NULL, SPI_XFER_BEGIN);
+		EFI_PRINT("SPI IO: xfer [1/2] returned %d\n", r);
+		if (r != 0) {
+			status = EFI_DEVICE_ERROR;
+			break;
+		}
+		r = spi_xfer(target, 8 * read_bytes,
+			     NULL, read_buffer, SPI_XFER_END);
+		EFI_PRINT("SPI IO: xfer [2/2] returned %d\n", r);
+		if (debug_transaction)
+			dump_buffer("SPI IO: read", read_bytes, read_buffer);
+		status = (r == 0) ? EFI_SUCCESS : EFI_DEVICE_ERROR;
+		break;
+	default:
+		status = EFI_INVALID_PARAMETER;
+		break;
+	}
+
+	spi_release_bus(target);
+	EFI_PRINT("SPI IO: Released bus\n");
+	return EFI_EXIT(status);
+}
+
+static struct efi_device_path null_device_path = {
+	.type     = DEVICE_PATH_TYPE_END,
+	.sub_type = DEVICE_PATH_SUB_TYPE_END,
+	.length   = 4
+};
+
+static struct efi_legacy_spi_controller_protocol
+dummy_legacy_spi_controller_protocol = {
+	.maximum_offset = 0,
+	.maximum_range_bytes = 0,
+	.range_register_count = 0,
+	.erase_block_opcode = legacy_erase_block_opcode,
+	.write_status_prefix = legacy_write_status_prefix,
+	.bios_base_address = legacy_bios_base_address,
+	.clear_spi_protect = legacy_clear_spi_protect,
+	.is_range_protected = legacy_is_range_protected,
+	.protect_next_range = legacy_protect_next_range,
+	.lock_controller = legacy_lock_controller
+};
+
+static efi_guid_t efi_spi_configuration_guid = EFI_SPI_CONFIGURATION_GUID;
+
+static void destroy_efi_spi_peripheral(struct efi_spi_peripheral *peripheral)
+{
+	struct efi_spi_peripheral_priv *priv =
+		container_of(peripheral,
+			     struct efi_spi_peripheral_priv,
+			     peripheral);
+	free(priv->peripheral.friendly_name);
+	free(priv->part.vendor);
+	free(priv->part.part_number);
+	free(priv);
+}
+
+static void destroy_efi_spi_bus(struct efi_spi_bus *bus)
+{
+	struct efi_spi_peripheral *peripheral = bus->peripheral_list;
+
+	while (peripheral) {
+		struct efi_spi_peripheral *next =
+			peripheral->next_spi_peripheral;
+		destroy_efi_spi_peripheral(peripheral);
+		peripheral = next;
+	}
+	free(bus->friendly_name);
+	free(bus);
+}
+
+static efi_status_t efi_spi_new_handle(const efi_guid_t *guid, void *proto)
+{
+	efi_status_t status;
+	efi_handle_t handle;
+
+	status = efi_create_handle(&handle);
+	if (status != EFI_SUCCESS) {
+		printf("Failed to create EFI handle\n");
+		goto fail_1;
+	}
+
+	status = efi_add_protocol(handle, guid, proto);
+	if (status != EFI_SUCCESS) {
+		printf("Failed to add protocol\n");
+		goto fail_2;
+	}
+
+	return EFI_SUCCESS;
+
+fail_2:
+	efi_delete_handle(handle);
+fail_1:
+	return status;
+}
+
+static void
+efi_spi_init_part(struct efi_spi_part *part,
+		  struct spi_slave *target,
+		  efi_string_t vendor_utf16,
+		  efi_string_t part_number_utf16
+)
+{
+	part->vendor = vendor_utf16;
+	part->part_number = part_number_utf16;
+	part->min_clock_hz = 0;
+	part->max_clock_hz = target->max_hz;
+	part->chip_select_polarity =
+		(target->mode & SPI_CS_HIGH) ? true : false;
+}
+
+static void
+efi_spi_init_peripheral(struct efi_spi_peripheral *peripheral,
+			struct efi_spi_part *part,
+			struct efi_spi_bus *bus,
+			struct spi_slave *target,
+			efi_guid_t *guid,
+			efi_string_t name_utf16
+)
+{
+	peripheral->friendly_name = name_utf16;
+	peripheral->spi_part = part;
+	peripheral->next_spi_peripheral = NULL;
+	peripheral->spi_peripheral_driver_guid = guid;
+	peripheral->max_clock_hz = target->max_hz;
+	peripheral->clock_polarity = (target->mode & SPI_CPOL) ? true : false;
+	peripheral->clock_phase = (target->mode & SPI_CPHA) ? true : false;
+	peripheral->attributes = 0;
+	peripheral->configuration_data = NULL;
+	peripheral->spi_bus = bus;
+	peripheral->chip_select = efi_spi_peripheral_chip_select;
+	peripheral->chip_select_parameter = NULL;
+}
+
+static void
+efi_spi_append_peripheral(struct efi_spi_peripheral *peripheral,
+			  struct efi_spi_bus *bus
+)
+{
+	if (bus->peripheral_list) {
+		struct efi_spi_peripheral *tmp = bus->peripheral_list;
+
+		while (tmp->next_spi_peripheral)
+			tmp = tmp->next_spi_peripheral;
+
+		tmp->next_spi_peripheral = peripheral;
+	} else {
+		bus->peripheral_list = peripheral;
+	}
+}
+
+static void
+efi_spi_init_io_protocol(struct efi_spi_io_protocol *io_protocol,
+			 struct efi_spi_peripheral *peripheral,
+			 struct spi_slave *target
+)
+{
+	u32 max_read, max_write;
+
+	io_protocol->spi_peripheral = peripheral;
+	io_protocol->original_spi_peripheral = peripheral;
+	io_protocol->legacy_spi_protocol = &dummy_legacy_spi_controller_protocol;
+	io_protocol->transaction = efi_spi_io_transaction;
+	io_protocol->update_spi_peripheral = efi_spi_io_update_spi_peripheral;
+
+	/* This is a bit of a hack. The EFI data structures do not allow us to
+	 * represent a frame size greater than 32 bits.
+	 */
+	if (target->wordlen <= 32)
+		io_protocol->frame_size_support_mask =
+			1 << (target->wordlen - 1);
+	else
+		io_protocol->frame_size_support_mask = 0;
+
+	/* Again, this is a bit of a hack. The EFI data structures only allow
+	 * for a single maximum transfer size whereas the u-boot spi_slave
+	 * structure records maximum read transfer size and maximum write
+	 * transfer size separately. So we need to take the minimum of these two
+	 * values.
+	 *
+	 * In u-boot, a value of zero for these fields means there is no limit
+	 * on the transfer size. However in the UEFI PI spec a value of zero is
+	 * invalid so we'll use 0xFFFFFFFF as a substitute unlimited value.
+	 */
+	max_write = target->max_write_size ? target->max_write_size : 0xFFFFFFFF;
+	max_read = target->max_read_size ? target->max_read_size : 0xFFFFFFFF;
+	io_protocol->maximum_transfer_bytes = (max_read > max_write) ? max_write : max_read;
+
+	/* Hack++. Leave attributes set to zero since the flags listed in the
+	 * UEFI PI spec have no defined numerical values and so cannot be used.
+	 */
+	io_protocol->attributes = 0;
+}
+
+static efi_status_t
+export_spi_peripheral(struct efi_spi_bus *bus, struct udevice *dev)
+{
+	efi_string_t name_utf16, vendor_utf16, part_number_utf16;
+	struct efi_spi_peripheral_priv *priv;
+	efi_status_t status;
+	struct udevice *dev_bus = dev->parent;
+	struct spi_slave *target;
+	const char *name = dev_read_name(dev);
+	const char *vendor = dev_read_string(dev, "uefi-spi-vendor");
+	const char *part_number = dev_read_string(dev, "uefi-spi-part-number");
+	efi_guid_t *guid =
+		(efi_guid_t *)dev_read_u8_array_ptr(dev, "uefi-spi-io-guid", 16);
+
+	if (device_get_uclass_id(dev) == UCLASS_SPI_EMUL) {
+		debug("Skipping emulated SPI peripheral %s\n", name);
+		goto fail_1;
+	}
+
+	if (!vendor || !part_number || !guid) {
+		debug("Skipping SPI peripheral %s\n", name);
+		status = EFI_UNSUPPORTED;
+		goto fail_1;
+	}
+
+	if (!device_active(dev)) {
+		int ret = device_probe(dev);
+		if (ret) {
+			debug("Skipping SPI peripheral %s, probe failed\n", name);
+			goto fail_1;
+		}
+	}
+
+	target = dev_get_parent_priv(dev);
+	if (!target) {
+		debug("Skipping uninitialized SPI peripheral %s\n", name);
+		status = EFI_UNSUPPORTED;
+		goto fail_1;
+	}
+
+	debug("Registering SPI dev %d:%d, name %s\n",
+	      dev_bus->seq_, spi_chip_select(dev), name);
+
+	priv = calloc(1, sizeof(*priv));
+	if (!priv) {
+		status = EFI_OUT_OF_RESOURCES;
+		goto fail_1;
+	}
+
+	vendor_utf16 = efi_convert_string(vendor);
+	if (!vendor_utf16) {
+		status = EFI_OUT_OF_RESOURCES;
+		goto fail_2;
+	}
+
+	part_number_utf16 = efi_convert_string(part_number);
+	if (!part_number_utf16) {
+		status = EFI_OUT_OF_RESOURCES;
+		goto fail_3;
+	}
+
+	name_utf16 = efi_convert_string(name);
+	if (!name_utf16) {
+		status = EFI_OUT_OF_RESOURCES;
+		goto fail_4;
+	}
+
+	priv->target = target;
+
+	efi_spi_init_part(&priv->part, target, vendor_utf16, part_number_utf16);
+
+	efi_spi_init_peripheral(&priv->peripheral, &priv->part,
+				bus, target, guid, name_utf16);
+
+	efi_spi_append_peripheral(&priv->peripheral, bus);
+
+	efi_spi_init_io_protocol(&priv->io_protocol, &priv->peripheral, target);
+
+	status = efi_spi_new_handle(guid, &priv->io_protocol);
+	if (status != EFI_SUCCESS)
+		goto fail_5;
+
+	debug("Added EFI_SPI_IO_PROTOCOL for %s with guid %pUl\n", name, guid);
+	return EFI_SUCCESS;
+
+fail_5:
+	free(name_utf16);
+fail_4:
+	free(part_number_utf16);
+fail_3:
+	free(vendor_utf16);
+fail_2:
+	free(priv);
+fail_1:
+	return status;
+}
+
+static struct efi_spi_bus *export_spi_bus(int i)
+{
+	struct efi_spi_bus *bus;
+	struct udevice *dev, *child;
+	const char *name;
+	int r;
+
+	r = uclass_get_device(UCLASS_SPI, i, &dev);
+	if (r < 0) {
+		printf("Failed to get SPI bus %d\n", i);
+		goto fail_1;
+	}
+
+	name = dev_read_name(dev);
+	debug("Registering SPI bus %d, name %s\n", i, name);
+
+	bus = calloc(1, sizeof(*bus));
+	if (!bus)
+		goto fail_1;
+
+	bus->friendly_name = efi_convert_string(name);
+	if (!bus->friendly_name)
+		goto fail_2;
+
+	bus->peripheral_list = NULL;
+	bus->clock = efi_spi_bus_clock;
+	bus->clock_parameter = NULL;
+
+	/* For the purposes of the current implementation, we do not need to expose
+	 * the hardware device path to users of the SPI I/O protocol.
+	 */
+	bus->controller_path = &null_device_path;
+
+	device_foreach_child(child, dev) {
+		efi_status_t status = export_spi_peripheral(bus, child);
+
+		if (status == EFI_OUT_OF_RESOURCES)
+			goto fail_3;
+	}
+
+	return bus;
+
+fail_3:
+	destroy_efi_spi_bus(bus);
+fail_2:
+	free(bus);
+fail_1:
+	return NULL;
+}
+
+efi_status_t efi_spi_protocol_register(void)
+{
+	efi_status_t status;
+	struct efi_spi_configuration_protocol *proto;
+	uint i;
+
+	printf("Registering EFI_SPI_CONFIGURATION_PROTOCOL\n");
+
+	proto = calloc(1, sizeof(*proto));
+	if (!proto) {
+		status = EFI_OUT_OF_RESOURCES;
+		goto fail_1;
+	}
+
+	proto->bus_count = uclass_id_count(UCLASS_SPI);
+	proto->bus_list = calloc(proto->bus_count, sizeof(*proto->bus_list));
+	if (!proto->bus_list) {
+		status = EFI_OUT_OF_RESOURCES;
+		goto fail_2;
+	}
+
+	for (i = 0; i < proto->bus_count; i++) {
+		proto->bus_list[i] = export_spi_bus(i);
+		if (!proto->bus_list[i])
+			goto fail_3;
+	}
+
+	status = efi_spi_new_handle(&efi_spi_configuration_guid, proto);
+	if (status != EFI_SUCCESS)
+		goto fail_3;
+
+	return EFI_SUCCESS;
+
+fail_3:
+	for (i = 0; i < proto->bus_count; i++) {
+		if (proto->bus_list[i])
+			destroy_efi_spi_bus(proto->bus_list[i]);
+	}
+	free(proto->bus_list);
+fail_2:
+	free(proto);
+fail_1:
+	return status;
+}
diff --git a/lib/uuid.c b/lib/uuid.c
index 465e1ac38f57..3f723b732588 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -187,6 +187,10 @@ static const struct {
 		"TCG2",
 		EFI_TCG2_PROTOCOL_GUID,
 		},
+	{
+		"SPI Protocol Stack",
+		EFI_SPI_CONFIGURATION_GUID
+	},
 	{
 		"System Partition",
 		PARTITION_SYSTEM_GUID
-- 
2.25.1

[PATCH v4 4/6] efi_selftest: Add tests for SPI protocol support

[Paul Barker]

These tests ensure that the new UEFI SPI I/O protocol support works as
expected. They are intended to execute on the sandbox target.

Signed-off-by: Paul Barker <paul.barker@sancloud.com>
---
 MAINTAINERS                                  |   1 +
 arch/sandbox/dts/test.dts                    |  13 +
 lib/efi_selftest/Makefile                    |   1 +
 lib/efi_selftest/efi_selftest_spi_protocol.c | 284 +++++++++++++++++++
 4 files changed, 299 insertions(+)
 create mode 100644 lib/efi_selftest/efi_selftest_spi_protocol.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 40b3f1c80daa..a58b2083a218 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -862,6 +862,7 @@ M:	Paul Barker <paul.barker@sancloud.com>
 S:	Maintained
 F:	include/efi_spi_protocol.h
 F:	lib/efi_loader/efi_spi_protocol.c
+F:	lib/efi_selftest/efi_selftest_spi_protocol.c
 
 EFI VARIABLES VIA OP-TEE
 M:	Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 2761588f0dad..05c3e0377ac4 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -1185,6 +1185,13 @@
 			compatible = "spansion,m25p16", "jedec,spi-nor";
 			spi-max-frequency = <40000000>;
 			sandbox,filename = "spi.bin";
+
+			uefi-spi-vendor = "spansion";
+			uefi-spi-part-number = "mt25p16";
+
+			/* GUID in UEFI format: b881eb5d-ad92-4a48-8fdd-fa75a8e4c6b8 */
+			uefi-spi-io-guid = [5d eb 81 b8 92 ad 48 4a
+					    8f dd fa 75 a8 e4 c6 b8];
 		};
 		spi.bin@1 {
 			reg = <1>;
@@ -1193,6 +1200,12 @@
 			sandbox,filename = "spi.bin";
 			spi-cpol;
 			spi-cpha;
+
+			uefi-spi-vendor = "spansion";
+			uefi-spi-part-number = "mt25p16";
+			/* GUID in UEFI format: b6b39ecd-2b1f-a643-b8d7-3192d7cf7270 */
+			uefi-spi-io-guid = [cd 9e b3 b6 1f 2b 43 a6
+					    b8 d7 31 92 d7 cf 72 70];
 		};
 	};
 
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index daac6c396820..2790fcd784e0 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_EFI_LOADER_HII) += efi_selftest_hii.o
 obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_selftest_rng.o
 obj-$(CONFIG_EFI_GET_TIME) += efi_selftest_rtc.o
 obj-$(CONFIG_EFI_TCG2_PROTOCOL) += efi_selftest_tcg2.o
+obj-$(CONFIG_EFI_SPI_PROTOCOL) += efi_selftest_spi_protocol.o
 
 ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
 obj-y += efi_selftest_fdt.o
diff --git a/lib/efi_selftest/efi_selftest_spi_protocol.c b/lib/efi_selftest/efi_selftest_spi_protocol.c
new file mode 100644
index 000000000000..946d04dbb557
--- /dev/null
+++ b/lib/efi_selftest/efi_selftest_spi_protocol.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2022 Micron Technology, Inc.
+ */
+
+#include <efi_selftest.h>
+#include <efi_spi_protocol.h>
+
+static struct efi_boot_services *boottime;
+static efi_guid_t efi_spi_configuration_guid = EFI_SPI_CONFIGURATION_GUID;
+
+static int setup(const efi_handle_t img_handle,
+		 const struct efi_system_table *systable)
+{
+	boottime = systable->boottime;
+	return EFI_ST_SUCCESS;
+}
+
+static int test_peripheral(struct efi_spi_peripheral *p, struct efi_spi_bus *bus)
+{
+	struct efi_spi_io_protocol *io_protocol;
+	u8 req[5], resp[5];
+	efi_status_t ret;
+
+	if (!p->friendly_name) {
+		efi_st_error("SPI peripheral lacks a friendly name\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!p->spi_peripheral_driver_guid) {
+		efi_st_error("SPI peripheral lacks driver GUID\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!p->spi_part) {
+		efi_st_error("SPI peripheral lacks SPI part definition\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!p->max_clock_hz) {
+		efi_st_error("SPI peripheral has a max clock rate of zero\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!p->spi_bus) {
+		efi_st_error("SPI peripheral lack pointer to SPI bus\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (p->spi_bus != bus) {
+		efi_st_error("SPI peripheral spi_bus pointer points to the wrong bus\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!p->chip_select) {
+		efi_st_error("SPI peripheral lacks chip_select function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!p->spi_part->vendor) {
+		efi_st_error("SPI part lacks vendor string\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!p->spi_part->part_number) {
+		efi_st_error("SPI part lacks part number string\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (p->spi_part->min_clock_hz > p->spi_part->max_clock_hz) {
+		efi_st_error("SPI part min clock rate is greater than max clock rate\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (p->spi_part->max_clock_hz != p->max_clock_hz) {
+		efi_st_error("SPI part max clock rate does not match peripheral max clock rate\n");
+		return EFI_ST_FAILURE;
+	}
+
+	ret = boottime->locate_protocol(p->spi_peripheral_driver_guid,
+					NULL, (void **)&io_protocol);
+	if (ret != EFI_SUCCESS) {
+		efi_st_error("SPI IO protocol not available\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->spi_peripheral != p) {
+		efi_st_error("SPI IO protocol spi_peripheral pointer points to the wrong peripheral\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->original_spi_peripheral != p) {
+		efi_st_error("SPI IO protocol original_spi_peripheral pointer points to the wrong peripheral\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->maximum_transfer_bytes) {
+		efi_st_error("SPI IO protocol has zero maximum transfer size\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol) {
+		efi_st_error("SPI IO protocol lacks legacy SPI protocol\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->transaction) {
+		efi_st_error("SPI IO protocol lacks transaction function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->update_spi_peripheral) {
+		efi_st_error("SPI IO protocol lacks update_spi_peripheral function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol->erase_block_opcode) {
+		efi_st_error("SPI legacy controller protocol lacks erase_block_opcode function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->legacy_spi_protocol->erase_block_opcode(
+			io_protocol->legacy_spi_protocol,
+			0) != EFI_UNSUPPORTED) {
+		efi_st_error("Incorrect return value from SPI legacy controller protocol erase_block_opcode function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol->write_status_prefix) {
+		efi_st_error("SPI legacy controller protocol lacks write_status_prefix function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->legacy_spi_protocol->write_status_prefix(
+			io_protocol->legacy_spi_protocol,
+			0) != EFI_UNSUPPORTED) {
+		efi_st_error("Incorrect return value from SPI legacy controller protocol write_status_prefix function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol->bios_base_address) {
+		efi_st_error("SPI legacy controller protocol lacks bios_base_address function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->legacy_spi_protocol->bios_base_address(
+			io_protocol->legacy_spi_protocol,
+			0) != EFI_UNSUPPORTED) {
+		efi_st_error("Incorrect return value from SPI legacy controller protocol bios_base_address function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol->clear_spi_protect) {
+		efi_st_error("SPI legacy controller protocol lacks clear_spi_protect function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->legacy_spi_protocol->clear_spi_protect(
+			io_protocol->legacy_spi_protocol) != EFI_UNSUPPORTED) {
+		efi_st_error("Incorrect return value from SPI legacy controller protocol clear_spi_protect function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol->is_range_protected) {
+		efi_st_error("SPI legacy controller protocol lacks is_range_protected function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->legacy_spi_protocol->is_range_protected(
+			io_protocol->legacy_spi_protocol,
+			0, 0)) {
+		efi_st_error("Incorrect return value from SPI legacy controller protocol is_range_protected function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol->protect_next_range) {
+		efi_st_error("SPI legacy controller protocol lacks protect_next_range function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->legacy_spi_protocol->protect_next_range(
+			io_protocol->legacy_spi_protocol,
+			0, 0) != EFI_UNSUPPORTED) {
+		efi_st_error("Incorrect return value from SPI legacy controller protocol protect_next_range function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!io_protocol->legacy_spi_protocol->lock_controller) {
+		efi_st_error("SPI legacy controller protocol lacks lock_controller function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (io_protocol->legacy_spi_protocol->lock_controller(
+			io_protocol->legacy_spi_protocol) != EFI_UNSUPPORTED) {
+		efi_st_error("Incorrect return value from SPI legacy controller protocol lock_controller function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	req[0] = 0x9f;
+	ret = io_protocol->transaction(io_protocol,
+				       SPI_TRANSACTION_FULL_DUPLEX,
+				       false, 0, 1, 8,
+				       sizeof(req), req,
+				       sizeof(resp), resp);
+	if (ret != EFI_SUCCESS) {
+		efi_st_error("SPI transaction failed\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if ((resp[0] != 0xff) || (resp[1] != 0x20) || (resp[2] != 0x20) || (resp[3] != 0x15)) {
+		efi_st_error("Incorrect response from sandbox SPI flash emulator\n");
+		return EFI_ST_FAILURE;
+	}
+
+	return EFI_ST_SUCCESS;
+}
+
+static int test_bus(struct efi_spi_bus *bus)
+{
+	struct efi_spi_peripheral *p;
+	int status;
+
+	if (!bus->friendly_name) {
+		efi_st_error("SPI bus lacks a friendly name\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!bus->peripheral_list) {
+		efi_st_error("SPI bus has zero peripherals\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!bus->clock) {
+		efi_st_error("SPI bus lacks clock function\n");
+		return EFI_ST_FAILURE;
+	}
+
+	for (p = bus->peripheral_list; p; p = p->next_spi_peripheral) {
+		status = test_peripheral(p, bus);
+		if (status) {
+			efi_st_error("Failed testing SPI peripheral\n");
+			return status;
+		}
+	}
+
+	return EFI_ST_SUCCESS;
+}
+
+static int execute(void)
+{
+	struct efi_spi_configuration_protocol *spi;
+	efi_status_t ret;
+	int status;
+	u32 i;
+
+	ret = boottime->locate_protocol(&efi_spi_configuration_guid,
+					NULL, (void **)&spi);
+	if (ret != EFI_SUCCESS) {
+		efi_st_error("SPI configuration protocol not available\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (!spi->bus_count) {
+		efi_st_error("SPI configuration protocol has zero busses\n");
+		return EFI_ST_FAILURE;
+	}
+
+	for (i = 0; i < spi->bus_count; i++) {
+		status = test_bus(spi->bus_list[i]);
+		if (status) {
+			efi_st_error("Failed testing SPI bus %d\n", i);
+			return status;
+		}
+	}
+
+	return EFI_ST_SUCCESS;
+}
+
+EFI_UNIT_TEST(spi_protocol) = {
+    .name = "SPI protocol",
+    .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
+    .setup = setup,
+    .execute = execute,
+};
-- 
2.25.1

[PATCH v4 5/6] arm: dts: am335x-sancloud-bbe-lite: UEFI SPI export

[Paul Barker]

Add properties to the Authenta SPI flash device node to enable access by
a UEFI application using a fixed GUID. Also specify that this device is
JEDEC compatible so that it is correctly initialized when running
`sf probe`.

Signed-off-by: Paul Barker <paul.barker@sancloud.com>
---
 arch/arm/dts/am335x-sancloud-bbe-lite.dts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm/dts/am335x-sancloud-bbe-lite.dts b/arch/arm/dts/am335x-sancloud-bbe-lite.dts
index d6ef19311a91..f1ff9d6024cb 100644
--- a/arch/arm/dts/am335x-sancloud-bbe-lite.dts
+++ b/arch/arm/dts/am335x-sancloud-bbe-lite.dts
@@ -37,14 +37,20 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&bb_spi0_pins>;
 
-	channel@0 {
+	authenta-flash@0 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		compatible = "micron,spi-authenta";
+		compatible = "micron,spi-authenta", "jedec,spi-nor";
 
 		reg = <0>;
 		spi-max-frequency = <16000000>;
 		spi-cpha;
+
+		uefi-spi-vendor = "micron";
+		uefi-spi-part-number = "mt25ql128abb";
+		/* GUID in UEFI format: 77126730-a4ca-4386-b341-881fe18e7f7d */
+		uefi-spi-io-guid = [30 67 12 77 ca a4 86 43
+				    b3 41 88 1f e1 8e 7f 7d];
 	};
 };
-- 
2.25.1

[PATCH v4 6/6] am335x_evm_defconfig: Enable Micron SPI flash support

[Paul Barker]

Signed-off-by: Paul Barker <paul.barker@sancloud.com>
---
 configs/am335x_evm_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configs/am335x_evm_defconfig b/configs/am335x_evm_defconfig
index f0fbe475b394..f73123e0b71d 100644
--- a/configs/am335x_evm_defconfig
+++ b/configs/am335x_evm_defconfig
@@ -92,6 +92,7 @@ CONFIG_SYS_NAND_U_BOOT_LOCATIONS=y
 CONFIG_SYS_NAND_U_BOOT_OFFS=0xc0000
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_SPEED=24000000
+CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_PHY_ATHEROS=y
 CONFIG_PHY_SMSC=y
-- 
2.25.1

Re: [PATCH v4 1/6] spi: Implement spi_set_speed

[Heinrich Schuchardt]

On 10/5/22 14:18, Paul Barker wrote:
> This function is already defined in spi.h but no implementation of it
> currently exists in the tree. The implementation is based on the static
> function spi_set_speed_mode(). The function prototype is modified so
> that an success or error condition can be returned to the caller.
>
> Signed-off-by: Paul Barker<paul.barker@sancloud.com>

Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Re: [PATCH v4 2/6] efi: Add string conversion helper

[Heinrich Schuchardt]

On 10/5/22 14:18, Paul Barker wrote:
> Signed-off-by: Paul Barker <paul.barker@sancloud.com>
> ---
>   include/efi_loader.h        |  3 ++-
>   lib/efi_loader/efi_string.c | 24 ++++++++++++++++++++++++
>   2 files changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/include/efi_loader.h b/include/efi_loader.h
> index 545ba06d9466..4dbbb2d3a06c 100644
> --- a/include/efi_loader.h
> +++ b/include/efi_loader.h
> @@ -985,9 +985,10 @@ struct pkcs7_message *efi_parse_pkcs7_header(const void *buf,
>   /* runtime implementation of memcpy() */
>   void efi_memcpy_runtime(void *dest, const void *src, size_t n);
>
> -/* commonly used helper function */
> +/* commonly used helper functions */
>   u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
>   			     unsigned int index);
> +efi_string_t efi_convert_string(const char *str);
>
>   extern const struct efi_firmware_management_protocol efi_fmp_fit;
>   extern const struct efi_firmware_management_protocol efi_fmp_raw;
> diff --git a/lib/efi_loader/efi_string.c b/lib/efi_loader/efi_string.c
> index 8bf1e493b89e..e21e09c94617 100644
> --- a/lib/efi_loader/efi_string.c
> +++ b/lib/efi_loader/efi_string.c
> @@ -8,6 +8,7 @@
>   #include <common.h>
>   #include <charset.h>
>   #include <efi_loader.h>
> +#include <malloc.h>
>
>   /**
>    * efi_create_indexed_name - create a string name with an index
> @@ -41,3 +42,26 @@ u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
>
>   	return p;
>   }
> +
> +/**
> + * efi_convert_string - Convert an ASCII or UTF-8 string to UTF-16
> + * @str:	String to be converted
> + *
> + * Return: Converted string in UTF-16 format. The caller is responsible for
> + *         freeing this string when it is no longer needed.
> + */
> +efi_string_t efi_convert_string(const char *str)
> +{
> +	efi_string_t str_16, tmp;
> +	size_t sz_16;
> +
> +	sz_16 = utf8_utf16_strlen(str);
> +	str_16 = calloc(sz_16 + 1, sizeof(u16));
> +	if (!str_16)
> +		return NULL;
> +
> +	tmp = str_16;
> +	utf8_utf16_strcpy(&tmp, str);
> +
> +	return str_16;
> +}

We will be able to use the function for code simplification in the
following places in future:

cmd/efidebug.c:800:
cmd/nvedit_efi.c:498:

Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Re: [U-Boot PATCH v4 5/6] arm: dts: am335x-sancloud-bbe-lite: UEFI SPI export

[Heinrich Schuchardt]

On 10/5/22 14:18, Paul Barker wrote:
> Add properties to the Authenta SPI flash device node to enable access by
> a UEFI application using a fixed GUID. Also specify that this device is
> JEDEC compatible so that it is correctly initialized when running
> `sf probe`.
>
> Signed-off-by: Paul Barker <paul.barker@sancloud.com>
> ---
>   arch/arm/dts/am335x-sancloud-bbe-lite.dts | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/dts/am335x-sancloud-bbe-lite.dts b/arch/arm/dts/am335x-sancloud-bbe-lite.dts
> index d6ef19311a91..f1ff9d6024cb 100644
> --- a/arch/arm/dts/am335x-sancloud-bbe-lite.dts
> +++ b/arch/arm/dts/am335x-sancloud-bbe-lite.dts
> @@ -37,14 +37,20 @@
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&bb_spi0_pins>;
>
> -	channel@0 {
> +	authenta-flash@0 {
>   		#address-cells = <1>;
>   		#size-cells = <0>;
>
> -		compatible = "micron,spi-authenta";
> +		compatible = "micron,spi-authenta", "jedec,spi-nor";

I cannot find "micron,spi-authenta" in Linux'
Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml. Should it be
added?

>
>   		reg = <0>;
>   		spi-max-frequency = <16000000>;
>   		spi-cpha;
> +
> +		uefi-spi-vendor = "micron";
> +		uefi-spi-part-number = "mt25ql128abb";

These properties seem to be neither UEFI nor SPI specific. Why should
they be prefixed with uefi-spi?

> +		/* GUID in UEFI format: 77126730-a4ca-4386-b341-881fe18e7f7d */
> +		uefi-spi-io-guid = [30 67 12 77 ca a4 86 43
> +				    b3 41 88 1f e1 8e 7f 7d];

The suggested properties which are required to set up the
EFI_SPI_IO_PROTOCOL need to be standardized and documented. The right
place would be a yaml file in Linux' Documentation/devicetree/bindings/mtd/.

Best regards

Heinrich

>   	};
>   };

Re: [PATCH v4 2/6] efi: Add string conversion helper

[Ilias Apalodimas]

Thanks Paul!

On Wed, Oct 05, 2022 at 01:18:35PM +0100, Paul Barker wrote:
> Signed-off-by: Paul Barker <paul.barker@sancloud.com>
> ---
>  include/efi_loader.h        |  3 ++-
>  lib/efi_loader/efi_string.c | 24 ++++++++++++++++++++++++
>  2 files changed, 26 insertions(+), 1 deletion(-)
> 
> diff --git a/include/efi_loader.h b/include/efi_loader.h
> index 545ba06d9466..4dbbb2d3a06c 100644
> --- a/include/efi_loader.h
> +++ b/include/efi_loader.h
> @@ -985,9 +985,10 @@ struct pkcs7_message *efi_parse_pkcs7_header(const void *buf,
>  /* runtime implementation of memcpy() */
>  void efi_memcpy_runtime(void *dest, const void *src, size_t n);
>  
> -/* commonly used helper function */
> +/* commonly used helper functions */
>  u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
>  			     unsigned int index);
> +efi_string_t efi_convert_string(const char *str);
>  
>  extern const struct efi_firmware_management_protocol efi_fmp_fit;
>  extern const struct efi_firmware_management_protocol efi_fmp_raw;
> diff --git a/lib/efi_loader/efi_string.c b/lib/efi_loader/efi_string.c
> index 8bf1e493b89e..e21e09c94617 100644
> --- a/lib/efi_loader/efi_string.c
> +++ b/lib/efi_loader/efi_string.c
> @@ -8,6 +8,7 @@
>  #include <common.h>
>  #include <charset.h>
>  #include <efi_loader.h>
> +#include <malloc.h>
>  
>  /**
>   * efi_create_indexed_name - create a string name with an index
> @@ -41,3 +42,26 @@ u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
>  
>  	return p;
>  }
> +
> +/**
> + * efi_convert_string - Convert an ASCII or UTF-8 string to UTF-16
> + * @str:	String to be converted
> + *
> + * Return: Converted string in UTF-16 format. The caller is responsible for
> + *         freeing this string when it is no longer needed.
> + */
> +efi_string_t efi_convert_string(const char *str)
> +{
> +	efi_string_t str_16, tmp;
> +	size_t sz_16;
> +
> +	sz_16 = utf8_utf16_strlen(str);
> +	str_16 = calloc(sz_16 + 1, sizeof(u16));
> +	if (!str_16)
> +		return NULL;
> +
> +	tmp = str_16;
> +	utf8_utf16_strcpy(&tmp, str);
> +
> +	return str_16;
> +}
> -- 
> 2.25.1
> 

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Re: [PATCH v4 3/6] efi_loader: Add SPI I/O protocol support

[Ilias Apalodimas]

Hi Paul, 

I think the series overall is in a good state,  but we are trying to figure
out if we can avoid defining SPI uuid's in the DT.  OTOH U-Boot uses the DT
for it's config so that might be okay...

[...]

> +{
> +	struct efi_spi_peripheral *peripheral = bus->peripheral_list;
> +
> +	while (peripheral) {
> +		struct efi_spi_peripheral *next =
> +			peripheral->next_spi_peripheral;
> +		destroy_efi_spi_peripheral(peripheral);
> +		peripheral = next;
> +	}
> +	free(bus->friendly_name);
> +	free(bus);
> +}
> +
> +static efi_status_t efi_spi_new_handle(const efi_guid_t *guid, void *proto)
> +{
> +	efi_status_t status;
> +	efi_handle_t handle;
> +
> +	status = efi_create_handle(&handle);
> +	if (status != EFI_SUCCESS) {
> +		printf("Failed to create EFI handle\n");
> +		goto fail_1;
> +	}
> +
> +	status = efi_add_protocol(handle, guid, proto);

Apologies for this it's my fault,  but can you replace efi_add_protocol ->
efi_install_multiple_protocol_interfaces?
commit 05c4c9e21ae6 ("efi_loader: define internal implementations of install/uninstallmultiple")
has some details on why.  A bit annoying but the change is straightforward

> +	if (status != EFI_SUCCESS) {
> +		printf("Failed to add protocol\n");
> +		goto fail_2;
> +	}
> +
> +	return EFI_SUCCESS;
> +
> +fail_2:
> +	efi_delete_handle(handle);

Same here, just uninstall the protocol

> +fail_1:
> +	return status;
> +}
> +
> +static void
> +efi_spi_init_part(struct efi_spi_part *part,
> +		  struct spi_slave *target,
> +		  efi_string_t vendor_utf16,
> +		  efi_string_t part_number_utf16
> +)
> +{
> +	part->vendor = vendor_utf16;
> +	part->part_number = part_number_utf16;
> +	part->min_clock_hz = 0;
> +	part->max_clock_hz = target->max_hz;
> +	part->chip_select_polarity =
> +		(target->mode & SPI_CS_HIGH) ? true : false;
> +}
> +
 

Thanks!
/Ilias

Re: [PATCH v4 3/6] efi_loader: Add SPI I/O protocol support

[Paul Barker]

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Hi Ilias,

On 24/10/2022 12:54, Ilias Apalodimas wrote:
> Hi Paul, 
> 
> I think the series overall is in a good state,  but we are trying to figure
> out if we can avoid defining SPI uuid's in the DT.  OTOH U-Boot uses the DT
> for it's config so that might be okay...

What may make sense is to prefix the DT property names with `u-boot,`.
i.e. they'd become:

* u-boot,uefi-spi-vendor
* u-boot,uefi-spi-part-number
* u-boot,uefi-spi-io-guid

For the sandbox tests it makes sense to keep the configuration in
arch/sandbox/dts/test.dts. However for a real device such as the
SanCloud BBE it makes sense to keep the dts file in line with the Linux
kernel dts file and add the configuration to a new file
arch/arm/dts/am335x-sancloud-bbe-lite-u-boot.dtsi which will be picked
up by the build system. That keeps the configuration separate from the
upstream dts file and matches what we do for properties like
`u-boot,dm-spl`.

Does that sound like a good way forward?

> 
> [...]
> 
>> +{
>> +	struct efi_spi_peripheral *peripheral = bus->peripheral_list;
>> +
>> +	while (peripheral) {
>> +		struct efi_spi_peripheral *next =
>> +			peripheral->next_spi_peripheral;
>> +		destroy_efi_spi_peripheral(peripheral);
>> +		peripheral = next;
>> +	}
>> +	free(bus->friendly_name);
>> +	free(bus);
>> +}
>> +
>> +static efi_status_t efi_spi_new_handle(const efi_guid_t *guid, void *proto)
>> +{
>> +	efi_status_t status;
>> +	efi_handle_t handle;
>> +
>> +	status = efi_create_handle(&handle);
>> +	if (status != EFI_SUCCESS) {
>> +		printf("Failed to create EFI handle\n");
>> +		goto fail_1;
>> +	}
>> +
>> +	status = efi_add_protocol(handle, guid, proto);
> 
> Apologies for this it's my fault,  but can you replace efi_add_protocol ->
> efi_install_multiple_protocol_interfaces?
> commit 05c4c9e21ae6 ("efi_loader: define internal implementations of install/uninstallmultiple")
> has some details on why.  A bit annoying but the change is straightforward

I'll change this for v5.

> 
>> +	if (status != EFI_SUCCESS) {
>> +		printf("Failed to add protocol\n");
>> +		goto fail_2;
>> +	}
>> +
>> +	return EFI_SUCCESS;
>> +
>> +fail_2:
>> +	efi_delete_handle(handle);
> 
> Same here, just uninstall the protocol

As above.

> 
>> +fail_1:
>> +	return status;
>> +}
>> +
>> +static void
>> +efi_spi_init_part(struct efi_spi_part *part,
>> +		  struct spi_slave *target,
>> +		  efi_string_t vendor_utf16,
>> +		  efi_string_t part_number_utf16
>> +)
>> +{
>> +	part->vendor = vendor_utf16;
>> +	part->part_number = part_number_utf16;
>> +	part->min_clock_hz = 0;
>> +	part->max_clock_hz = target->max_hz;
>> +	part->chip_select_polarity =
>> +		(target->mode & SPI_CS_HIGH) ? true : false;
>> +}
>> +
>  
> 
> Thanks!
> /Ilias

Thanks,

-- 
Paul Barker
Principal Software Engineer
SanCloud Ltd

e: paul.barker@sancloud.com
w: https://sancloud.com/

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Re: [PATCH v4 3/6] efi_loader: Add SPI I/O protocol support

[Tom Rini]

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On Tue, Oct 25, 2022 at 05:39:48PM +0100, Paul Barker wrote:
> Hi Ilias,
> 
> On 24/10/2022 12:54, Ilias Apalodimas wrote:
> > Hi Paul, 
> > 
> > I think the series overall is in a good state,  but we are trying to figure
> > out if we can avoid defining SPI uuid's in the DT.  OTOH U-Boot uses the DT
> > for it's config so that might be okay...
> 
> What may make sense is to prefix the DT property names with `u-boot,`.
> i.e. they'd become:
> 
> * u-boot,uefi-spi-vendor
> * u-boot,uefi-spi-part-number
> * u-boot,uefi-spi-io-guid

Note that this still means updating the upstream yaml file that
describes the binding.

-- 
Tom

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