From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, srinivas.kandagatla@linaro.org
Subject: [RESEND PATCH 10/20] nvmem: Add driver for STM32 factory-programmed read only mem
Date: Sat, 13 Apr 2019 11:32:55 +0100 [thread overview]
Message-ID: <20190413103305.9576-11-srinivas.kandagatla@linaro.org> (raw)
In-Reply-To: <20190413103305.9576-1-srinivas.kandagatla@linaro.org>
From: Fabrice Gasnier <fabrice.gasnier@st.com>
Add a read only nvmem driver for STM32 factory-programmed memory area
(on-chip non-volatile storage).
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/nvmem/Kconfig | 10 +++++
drivers/nvmem/Makefile | 2 +
drivers/nvmem/stm32-romem.c | 78 +++++++++++++++++++++++++++++++++++++
3 files changed, 90 insertions(+)
create mode 100644 drivers/nvmem/stm32-romem.c
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 9e1d83643e9c..a90e9a1ebe55 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -113,6 +113,16 @@ config NVMEM_BCM_OCOTP
This driver can also be built as a module. If so, the module
will be called nvmem-bcm-ocotp.
+config NVMEM_STM32_ROMEM
+ tristate "STMicroelectronics STM32 factory-programmed memory support"
+ depends on ARCH_STM32 || COMPILE_TEST
+ help
+ Say y here to enable read-only access for STMicroelectronics STM32
+ factory-programmed memory area.
+
+ This driver can also be built as a module. If so, the module
+ will be called nvmem-stm32-romem.
+
config NVMEM_SUNXI_SID
tristate "Allwinner SoCs SID support"
depends on ARCH_SUNXI
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 2ece8ffffdda..4c7ba12a7005 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -26,6 +26,8 @@ nvmem_qfprom-y := qfprom.o
obj-$(CONFIG_ROCKCHIP_EFUSE) += nvmem_rockchip_efuse.o
nvmem_rockchip_efuse-y := rockchip-efuse.o
obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o
+nvmem_stm32_romem-y := stm32-romem.o
+obj-$(CONFIG_NVMEM_STM32_ROMEM) += nvmem_stm32_romem.o
nvmem_sunxi_sid-y := sunxi_sid.o
obj-$(CONFIG_UNIPHIER_EFUSE) += nvmem-uniphier-efuse.o
nvmem-uniphier-efuse-y := uniphier-efuse.o
diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c
new file mode 100644
index 000000000000..07e98b53b391
--- /dev/null
+++ b/drivers/nvmem/stm32-romem.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * STM32 Factory-programmed memory read access driver
+ *
+ * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
+ * Author: Fabrice Gasnier <fabrice.gasnier@st.com> for STMicroelectronics.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of_device.h>
+
+struct stm32_romem_priv {
+ void __iomem *base;
+ struct nvmem_config cfg;
+};
+
+static int stm32_romem_read(void *context, unsigned int offset, void *buf,
+ size_t bytes)
+{
+ struct stm32_romem_priv *priv = context;
+ u8 *buf8 = buf;
+ int i;
+
+ for (i = offset; i < offset + bytes; i++)
+ *buf8++ = readb_relaxed(priv->base + i);
+
+ return 0;
+}
+
+static int stm32_romem_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct stm32_romem_priv *priv;
+ struct resource *res;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ priv->cfg.name = "stm32-romem";
+ priv->cfg.read_only = true;
+ priv->cfg.word_size = 1;
+ priv->cfg.stride = 1;
+ priv->cfg.size = resource_size(res);
+ priv->cfg.reg_read = stm32_romem_read;
+ priv->cfg.dev = dev;
+ priv->cfg.priv = priv;
+ priv->cfg.owner = THIS_MODULE;
+
+ return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &priv->cfg));
+}
+
+static const struct of_device_id stm32_romem_of_match[] = {
+ { .compatible = "st,stm32f4-otp", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, stm32_romem_of_match);
+
+static struct platform_driver stm32_romem_driver = {
+ .probe = stm32_romem_probe,
+ .driver = {
+ .name = "stm32-romem",
+ .of_match_table = of_match_ptr(stm32_romem_of_match),
+ },
+};
+module_platform_driver(stm32_romem_driver);
+
+MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics STM32 RO-MEM");
+MODULE_ALIAS("platform:nvmem-stm32-romem");
+MODULE_LICENSE("GPL v2");
--
2.21.0
next prev parent reply other threads:[~2019-04-13 10:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-13 10:32 [RESEND PATCH 00/20] nvmem: patches(set 1) for 5.2 Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 01/20] dt-bindings: imx-ocotp: Add i.MX8MQ compatible Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 02/20] nvmem: imx-ocotp: add support for imx8mq Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 03/20] nvmem: imx-ocotp: broaden Kconfig dependency Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 04/20] nvmem: sunxi_sid: Read out SID for randomness without looping Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 05/20] nvmem: sunxi_sid: Optimize register read-out method Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 06/20] nvmem: sunxi_sid: Dynamically allocate nvmem_config structure Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 07/20] nvmem: sunxi_sid: Read out data in native format Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 08/20] nvmem: sunxi_sid: Support SID on A83T and H5 Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 09/20] dt-bindings: nvmem: Add STM32 factory-programmed romem Srinivas Kandagatla
2019-04-13 10:32 ` Srinivas Kandagatla [this message]
2019-04-13 10:32 ` [RESEND PATCH 11/20] nvmem: stm32: add support for STM32MP15 BSEC to control OTP data Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 12/20] nvmem: core: add nvmem_cell_read_u16 Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 13/20] nvmem: core: fix read buffer in place Srinivas Kandagatla
2019-04-13 10:32 ` [RESEND PATCH 14/20] nvmem: imx-ocotp: use devm_platform_ioremap_resource() to simplify code Srinivas Kandagatla
2019-04-13 10:33 ` [RESEND PATCH 15/20] nvmem: mxs-ocotp: " Srinivas Kandagatla
2019-04-13 10:33 ` [RESEND PATCH 16/20] nvmem: imx-iim: " Srinivas Kandagatla
2019-04-13 10:33 ` [RESEND PATCH 17/20] nvmem: sunxi-sid: fix wrong description in kernel doc Srinivas Kandagatla
2019-04-13 10:33 ` [RESEND PATCH 18/20] nvmem: sunxi-sid: add binding for H6's SID controller Srinivas Kandagatla
2019-04-13 10:33 ` [RESEND PATCH 19/20] nvmem: sunxi-sid: convert to SPDX license tags Srinivas Kandagatla
2019-04-13 10:33 ` [RESEND PATCH 20/20] nvmem: sunxi_sid: Support SID on H6 Srinivas Kandagatla
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