From fbfc4ca465a1f8d81bf2d67d95bf7fc67c3cf0c2 Mon Sep 17 00:00:00 2001 From: Patrick Delaunay Date: Fri, 18 Nov 2022 06:39:20 +0000 Subject: [PATCH] nvmem: stm32: move STM32MP15_BSEC_NUM_LOWER in config Support STM32MP15_BSEC_NUM_LOWER in stm32 romem config to prepare the next SoC in STM32MP family. Signed-off-by: Patrick Delaunay Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20221118063932.6418-2-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/stm32-romem.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) --- a/drivers/nvmem/stm32-romem.c +++ b/drivers/nvmem/stm32-romem.c @@ -22,16 +22,15 @@ /* shadow registers offest */ #define STM32MP15_BSEC_DATA0 0x200 -/* 32 (x 32-bits) lower shadow registers */ -#define STM32MP15_BSEC_NUM_LOWER 32 - struct stm32_romem_cfg { int size; + u8 lower; }; struct stm32_romem_priv { void __iomem *base; struct nvmem_config cfg; + u8 lower; }; static int stm32_romem_read(void *context, unsigned int offset, void *buf, @@ -85,7 +84,7 @@ static int stm32_bsec_read(void *context for (i = roffset; (i < roffset + rbytes); i += 4) { u32 otp = i >> 2; - if (otp < STM32MP15_BSEC_NUM_LOWER) { + if (otp < priv->lower) { /* read lower data from shadow registers */ val = readl_relaxed( priv->base + STM32MP15_BSEC_DATA0 + i); @@ -159,6 +158,8 @@ static int stm32_romem_probe(struct plat priv->cfg.priv = priv; priv->cfg.owner = THIS_MODULE; + priv->lower = 0; + cfg = (const struct stm32_romem_cfg *) of_match_device(dev->driver->of_match_table, dev)->data; if (!cfg) { @@ -167,6 +168,7 @@ static int stm32_romem_probe(struct plat priv->cfg.reg_read = stm32_romem_read; } else { priv->cfg.size = cfg->size; + priv->lower = cfg->lower; priv->cfg.reg_read = stm32_bsec_read; priv->cfg.reg_write = stm32_bsec_write; } @@ -174,8 +176,17 @@ static int stm32_romem_probe(struct plat return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &priv->cfg)); } +/* + * STM32MP15 BSEC OTP regions: 4096 OTP bits (with 3072 effective bits) + * => 96 x 32-bits data words + * - Lower: 1K bits, 2:1 redundancy, incremental bit programming + * => 32 (x 32-bits) lower shadow registers = words 0 to 31 + * - Upper: 2K bits, ECC protection, word programming only + * => 64 (x 32-bits) = words 32 to 95 + */ static const struct stm32_romem_cfg stm32mp15_bsec_cfg = { - .size = 384, /* 96 x 32-bits data words */ + .size = 384, + .lower = 32, }; static const struct of_device_id stm32_romem_of_match[] = {