diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/amd/common/block/psp/psp_smi_flash.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/psp/psp_smi_flash.c b/src/soc/amd/common/block/psp/psp_smi_flash.c index f1b9d85fbb..4c83fcd358 100644 --- a/src/soc/amd/common/block/psp/psp_smi_flash.c +++ b/src/soc/amd/common/block/psp/psp_smi_flash.c @@ -1,7 +1,11 @@ /* SPDX-License-Identifier: GPL-2.0-only */ +#include <boot_device.h> +#include <commonlib/region.h> #include <console/console.h> #include <device/mmio.h> +#include <fmap.h> +#include <spi_flash.h> #include <types.h> #include "psp_def.h" @@ -67,6 +71,69 @@ static bool is_valid_psp_spi_erase(struct mbox_pspv2_cmd_spi_erase *cmd_buf) return is_valid_psp_spi_id(read64(&cmd_buf->req.target_nv_id)); } +static const char *id_to_region_name(u64 target_nv_id) +{ + switch (target_nv_id) { + case SMI_TARGET_NVRAM: + return "PSP_NVRAM"; + case SMI_TARGET_RPMC_NVRAM: + return "PSP_RPMC_NVRAM"; + } + return NULL; +} + +/* + * Do not cache the location to cope with flash changing underneath (e.g. due + * to an update) + */ +static int lookup_store(u64 target_nv_id, struct region_device *rstore) +{ + /* read_rdev, write_rdev and store_irdev need to be static to not go out of scope when + this function returns */ + static struct region_device read_rdev, write_rdev; + static struct incoherent_rdev store_irdev; + const char *name; + struct region region; + const struct region_device *rdev; + + name = id_to_region_name(target_nv_id); + if (!name) + return -1; + + if (fmap_locate_area(name, ®ion) < 0) + return -1; + + if (boot_device_ro_subregion(®ion, &read_rdev) < 0) + return -1; + + if (boot_device_rw_subregion(®ion, &write_rdev) < 0) + return -1; + + rdev = incoherent_rdev_init(&store_irdev, ®ion, &read_rdev, &write_rdev); + if (rdev == NULL) + return -1; + + return rdev_chain(rstore, rdev, 0, region_device_sz(rdev)); +} + +static inline enum mbox_p2c_status find_psp_spi_flash_device_region(u64 target_nv_id, + struct region_device *store, + const struct spi_flash **flash) +{ + *flash = boot_device_spi_flash(); + if (*flash == NULL) { + printk(BIOS_ERR, "PSP: Unable to find SPI device\n"); + return MBOX_PSP_COMMAND_PROCESS_ERROR; + } + + if (lookup_store(target_nv_id, store) < 0) { + printk(BIOS_ERR, "PSP: Unable to find PSP SPI region\n"); + return MBOX_PSP_COMMAND_PROCESS_ERROR; + } + + return MBOX_PSP_SUCCESS; +} + enum mbox_p2c_status psp_smi_spi_get_info(struct mbox_default_buffer *buffer) { struct mbox_pspv2_cmd_spi_info *const cmd_buf = |