From: Jules Maselbas <jmaselbas@kalray.eu>
To: barebox@lists.infradead.org
Cc: Clement Leger <clement.leger@bootlin.com>,
Louis Morhet <lmorhet@kalray.eu>, Luc Michel <lmichel@kalray.eu>,
Yann Sionneau <ysionneau@kalray.eu>,
Jules Maselbas <jmaselbas@kalray.eu>
Subject: [PATCH v2 08/11] nvmem: add kvx otp non volatile regbank support
Date: Mon, 17 Jan 2022 23:19:14 +0100 [thread overview]
Message-ID: <20220117221917.26970-9-jmaselbas@kalray.eu> (raw)
In-Reply-To: <20220117221917.26970-1-jmaselbas@kalray.eu>
From: Clement Leger <clement.leger@bootlin.com>
Backport Linux driver to barebox to access nvmem.
Signed-off-by: Clement Leger <clement.leger@bootlin.com>
Signed-off-by: Jules Maselbas <jmaselbas@kalray.eu>
---
changes in v2:
- removed if (allways set skip to 0 after the memcopy)
---
drivers/nvmem/Kconfig | 7 +++
drivers/nvmem/Makefile | 3 ++
drivers/nvmem/kvx-otp-nv.c | 98 ++++++++++++++++++++++++++++++++++++++
3 files changed, 108 insertions(+)
create mode 100644 drivers/nvmem/kvx-otp-nv.c
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 7b1ebe1d68..2e60734156 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -76,6 +76,13 @@ config STM32_BSEC_WRITE
mw -l -d /dev/stm32-bsec 0x000000e4+4 0x78563412
mw -l -d /dev/stm32-bsec 0x000000e8+4 0x0000bc9a
+config KVX_OTP_NV
+ tristate "kalray KVX OTP Non volatile regs Support"
+ depends on KVX
+ help
+ This is a simple driver to dump specified values of KVX OTP non
+ volatile regs.
+
config STARFIVE_OTP
tristate "Starfive OTP Supprot"
depends on SOC_STARFIVE
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 5865919612..62a1f925dd 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -24,4 +24,7 @@ nvmem_eeprom_93xx46-y := eeprom_93xx46.o
obj-$(CONFIG_STM32_BSEC) += nvmem_bsec.o
nvmem_bsec-y := bsec.o
+obj-$(CONFIG_KVX_OTP_NV) += nvmem-kvx-otp-nv.o
+nvmem-kvx-otp-nv-y := kvx-otp-nv.o
+
obj-$(CONFIG_STARFIVE_OTP) += starfive-otp.o
diff --git a/drivers/nvmem/kvx-otp-nv.c b/drivers/nvmem/kvx-otp-nv.c
new file mode 100644
index 0000000000..d614c16e1e
--- /dev/null
+++ b/drivers/nvmem/kvx-otp-nv.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020 Kalray Inc., Clément Léger
+ */
+
+#include <common.h>
+#include <driver.h>
+#include <malloc.h>
+#include <xfuncs.h>
+#include <errno.h>
+#include <init.h>
+#include <net.h>
+#include <io.h>
+
+#include <linux/nvmem-provider.h>
+
+#define OTP_NV_ALIGN 4
+#define OTP_NV_ALIGN_MASK (OTP_NV_ALIGN - 1)
+
+struct kvx_otp_nv_priv {
+ void __iomem *base;
+};
+
+static int kvx_otp_nv_read(void *context, unsigned int offset,
+ void *_val, size_t bytes)
+{
+ struct kvx_otp_nv_priv *priv = context;
+ u8 *val = _val;
+ u32 tmp, copy_size;
+ u8 skip = offset & OTP_NV_ALIGN_MASK;
+
+ offset &= ~OTP_NV_ALIGN_MASK;
+
+ while (bytes) {
+ tmp = readl(priv->base + offset);
+ if (skip != 0)
+ copy_size = min(OTP_NV_ALIGN - skip, (int) bytes);
+ else
+ copy_size = min(bytes, sizeof(tmp));
+
+ memcpy(val, ((u8 *) &tmp) + skip, copy_size);
+ skip = 0;
+
+ bytes -= copy_size;
+ val += copy_size;
+ offset += OTP_NV_ALIGN;
+ }
+
+ return 0;
+}
+
+static const struct nvmem_bus kvx_otp_nv_bus = {
+ .read = kvx_otp_nv_read,
+};
+
+static const struct of_device_id kvx_otp_nv_match[] = {
+ { .compatible = "kalray,kvx-otp-nv" },
+ { /* sentinel */},
+};
+
+static int kvx_otp_nv_probe(struct device_d *dev)
+{
+ struct resource *res;
+ struct nvmem_device *nvmem;
+ struct nvmem_config econfig = { 0 };
+ struct kvx_otp_nv_priv *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = dev_request_mem_resource(dev, 0);
+ if (IS_ERR(res))
+ return PTR_ERR(res);
+
+ priv->base = IOMEM(res->start);
+
+ econfig.name = "kvx-nv-regbank";
+ econfig.stride = 1;
+ econfig.word_size = 1;
+ econfig.size = resource_size(res);
+ econfig.dev = dev;
+ econfig.priv = priv;
+ econfig.bus = &kvx_otp_nv_bus;
+
+ dev->priv = priv;
+
+ nvmem = nvmem_register(&econfig);
+
+ return PTR_ERR_OR_ZERO(nvmem);
+}
+
+static struct driver_d kvx_otp_nv_driver = {
+ .name = "kvx-otp-nv",
+ .probe = kvx_otp_nv_probe,
+ .of_compatible = DRV_OF_COMPAT(kvx_otp_nv_match),
+};
+postcore_platform_driver(kvx_otp_nv_driver);
--
2.17.1
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next prev parent reply other threads:[~2022-01-17 22:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-17 22:19 [PATCH v2 00/11] kvx arch update Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 01/11] kvx: dma: Remove arch dma_map/unmap_single Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 02/11] kvx: Move LINUX_BOOT_PARAM_MAGIC in asm/common.h Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 03/11] kvx: Accept LINUX_BOOT_PARAM_MAGIC as a valid magic value Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 04/11] common: elf: add elf_load_binary Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 05/11] kvx: enable FITIMAGE support Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 06/11] clocksource: kvx: Register as postcore_platform_driver Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 07/11] watchdog: kvx: do not disable watchdog on probe Jules Maselbas
2022-01-19 14:25 ` Ahmad Fatoum
2022-01-17 22:19 ` Jules Maselbas [this message]
2022-01-17 22:19 ` [PATCH v2 09/11] kvx: add kvx_sfr_field_val Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 10/11] drivers: add soc hierarchy properly Jules Maselbas
2022-01-17 22:19 ` [PATCH v2 11/11] soc: add kvx_socinfo driver Jules Maselbas
2022-01-18 8:09 ` [PATCH v2 00/11] kvx arch update Sascha Hauer
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