[U-Boot] [PATCH v4 093/100] x86: apl: Add SPL loaders
Simon Glass
sjg at chromium.org
Fri Nov 22 04:18:58 UTC 2019
Add loaders for SPL and TPL so that the next stage can be loaded from
memory-mapped SPI or, failing that, the Fast SPI driver.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v4: None
Changes in v3:
- Add a driver for APL SPI for TPL (using of-platdata)
- Support TPL without CONFIG_TPL_SPI_SUPPORT
- Support bootstage timing
Changes in v2: None
arch/x86/cpu/apollolake/Makefile | 2 +
arch/x86/cpu/apollolake/spl.c | 202 +++++++++++++++++++++++++++++++
2 files changed, 204 insertions(+)
create mode 100644 arch/x86/cpu/apollolake/spl.c
diff --git a/arch/x86/cpu/apollolake/Makefile b/arch/x86/cpu/apollolake/Makefile
index 875d454157..1fde400d77 100644
--- a/arch/x86/cpu/apollolake/Makefile
+++ b/arch/x86/cpu/apollolake/Makefile
@@ -2,7 +2,9 @@
#
# Copyright 2019 Google LLC
+obj-$(CONFIG_SPL_BUILD) += spl.o
obj-$(CONFIG_SPL_BUILD) += systemagent.o
+
ifndef CONFIG_TPL_BUILD
obj-y += punit.o
endif
diff --git a/arch/x86/cpu/apollolake/spl.c b/arch/x86/cpu/apollolake/spl.c
new file mode 100644
index 0000000000..a12379e312
--- /dev/null
+++ b/arch/x86/cpu/apollolake/spl.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#include <common.h>
+#include <binman_sym.h>
+#include <dm.h>
+#include <spi.h>
+#include <spl.h>
+#include <spi_flash.h>
+#include <asm/fast_spi.h>
+#include <asm/spl.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/iomap.h>
+#include <dm/device-internal.h>
+#include <dm/uclass-internal.h>
+
+/*
+ * We need to read well past the end of the region in order for execution from
+ * the loaded data to work. It is not clear why.
+ */
+#define SAFETY_MARGIN 0x4000
+
+binman_sym_declare(ulong, u_boot_spl, image_pos);
+binman_sym_declare(ulong, u_boot_spl, size);
+/* U-Boot image_pos is declared by common/spl/spl.c */
+binman_sym_declare(ulong, u_boot_any, size);
+
+static ulong get_image_pos(void)
+{
+ return spl_phase() == PHASE_TPL ?
+ binman_sym(ulong, u_boot_spl, image_pos) :
+ binman_sym(ulong, u_boot_any, image_pos);
+}
+
+static ulong get_image_size(void)
+{
+ return spl_phase() == PHASE_TPL ?
+ binman_sym(ulong, u_boot_spl, size) :
+ binman_sym(ulong, u_boot_any, size);
+}
+
+/* This reads the next phase from mapped SPI flash */
+static int rom_load_image(struct spl_image_info *spl_image,
+ struct spl_boot_device *bootdev)
+{
+ ulong spl_pos = get_image_pos();
+ ulong spl_size = get_image_size();
+ struct udevice *dev;
+ ulong map_base;
+ size_t map_size;
+ uint offset;
+ int ret;
+
+ spl_image->size = CONFIG_SYS_MONITOR_LEN; /* We don't know SPL size */
+ spl_image->entry_point = spl_phase() == PHASE_TPL ?
+ CONFIG_SPL_TEXT_BASE : CONFIG_SYS_TEXT_BASE;
+ spl_image->load_addr = spl_image->entry_point;
+ spl_image->os = IH_OS_U_BOOT;
+ spl_image->name = "U-Boot";
+ debug("Reading from mapped SPI %lx, size %lx", spl_pos, spl_size);
+
+ if (CONFIG_IS_ENABLED(SPI_FLASH_SUPPORT)) {
+ ret = uclass_find_first_device(UCLASS_SPI_FLASH, &dev);
+ if (ret)
+ return log_msg_ret("spi_flash", ret);
+ if (!dev)
+ return log_msg_ret("spi_flash dev", -ENODEV);
+ ret = dm_spi_get_mmap(dev, &map_base, &map_size, &offset);
+ if (ret)
+ return log_msg_ret("mmap", ret);
+ } else {
+ ret = fast_spi_get_bios_mmap(PCH_DEV_SPI, &map_base, &map_size,
+ &offset);
+ if (ret)
+ return ret;
+ }
+ spl_pos += map_base & ~0xff000000;
+ debug(", base %lx, pos %lx\n", map_base, spl_pos);
+ bootstage_start(BOOTSTAGE_ID_ACCUM_MMAP_SPI, "mmap_spi");
+ memcpy((void *)spl_image->load_addr, (void *)spl_pos,
+ spl_size + SAFETY_MARGIN);
+ bootstage_accum(BOOTSTAGE_ID_ACCUM_MMAP_SPI);
+
+ return 0;
+}
+SPL_LOAD_IMAGE_METHOD("Mapped SPI", 2, BOOT_DEVICE_SPI_MMAP, rom_load_image);
+
+#if CONFIG_IS_ENABLED(SPI_FLASH_SUPPORT)
+
+static int apl_flash_std_read(struct udevice *dev, u32 offset, size_t len,
+ void *buf)
+{
+ struct spi_flash *flash = dev_get_uclass_priv(dev);
+ struct mtd_info *mtd = &flash->mtd;
+ size_t retlen;
+
+ return log_ret(mtd->_read(mtd, offset, len, &retlen, buf));
+}
+
+static int apl_flash_probe(struct udevice *dev)
+{
+ return spi_flash_std_probe(dev);
+}
+
+/*
+ * Manually set the parent of the SPI flash to SPI, since dtoc doesn't. We also
+ * need to allocate the parent_platdata since by the time this function is
+ * called device_bind() has already gone past that step.
+ */
+static int apl_flash_bind(struct udevice *dev)
+{
+ if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
+ struct dm_spi_slave_platdata *plat;
+ struct udevice *spi;
+ int ret;
+
+ ret = uclass_first_device_err(UCLASS_SPI, &spi);
+ if (ret)
+ return ret;
+ dev->parent = spi;
+
+ plat = calloc(sizeof(*plat), 1);
+ if (!plat)
+ return -ENOMEM;
+ dev->parent_platdata = plat;
+ }
+
+ return 0;
+}
+
+static const struct dm_spi_flash_ops apl_flash_ops = {
+ .read = apl_flash_std_read,
+};
+
+static const struct udevice_id apl_flash_ids[] = {
+ { .compatible = "jedec,spi-nor" },
+ { }
+};
+
+U_BOOT_DRIVER(winbond_w25q128fw) = {
+ .name = "winbond_w25q128fw",
+ .id = UCLASS_SPI_FLASH,
+ .of_match = apl_flash_ids,
+ .bind = apl_flash_bind,
+ .probe = apl_flash_probe,
+ .priv_auto_alloc_size = sizeof(struct spi_flash),
+ .ops = &apl_flash_ops,
+};
+
+/* This uses a SPI flash device to read the next phase */
+static int spl_fast_spi_load_image(struct spl_image_info *spl_image,
+ struct spl_boot_device *bootdev)
+{
+ ulong spl_pos = get_image_pos();
+ ulong spl_size = get_image_size();
+ struct udevice *dev;
+ int ret;
+
+ ret = uclass_first_device_err(UCLASS_SPI_FLASH, &dev);
+ if (ret)
+ return ret;
+
+ spl_image->size = CONFIG_SYS_MONITOR_LEN; /* We don't know SPL size */
+ spl_image->entry_point = spl_phase() == PHASE_TPL ?
+ CONFIG_SPL_TEXT_BASE : CONFIG_SYS_TEXT_BASE;
+ spl_image->load_addr = spl_image->entry_point;
+ spl_image->os = IH_OS_U_BOOT;
+ spl_image->name = "U-Boot";
+ spl_pos &= ~0xff000000;
+ debug("Reading from flash %lx, size %lx\n", spl_pos, spl_size);
+ ret = spi_flash_read_dm(dev, spl_pos, spl_size + SAFETY_MARGIN,
+ (void *)spl_image->load_addr);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+SPL_LOAD_IMAGE_METHOD("Fast SPI", 1, BOOT_DEVICE_FAST_SPI,
+ spl_fast_spi_load_image);
+
+void board_boot_order(u32 *spl_boot_list)
+{
+ bool use_spi_flash = BOOT_FROM_FAST_SPI_FLASH;
+
+ if (use_spi_flash) {
+ spl_boot_list[0] = BOOT_DEVICE_FAST_SPI;
+ spl_boot_list[1] = BOOT_DEVICE_SPI_MMAP;
+ } else {
+ spl_boot_list[0] = BOOT_DEVICE_SPI_MMAP;
+ spl_boot_list[1] = BOOT_DEVICE_FAST_SPI;
+ }
+}
+
+#else
+
+void board_boot_order(u32 *spl_boot_list)
+{
+ spl_boot_list[0] = BOOT_DEVICE_SPI_MMAP;
+}
+#endif
--
2.24.0.432.g9d3f5f5b63-goog
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