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Message-ID: <20180324174638.12621-2-chinnikishore369@gmail.com>
Date: Sat, 24 Mar 2018 23:16:38 +0530
From: <chinnikishore369@...il.com>
To: <srinivas.kandagatla@...aro.org>, <michal.simek@...inx.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: Nava kishore Manne <navam@...inx.com>
Subject: [RFC 2/2] nvmem: zynqmp: Added zynqmp nvmem firmware driver
From: Nava kishore Manne <navam@...inx.com>
This patch adds zynqmp nvmem firmware driver to access the
SoC revision information from the hardware register.
Signed-off-by: Nava kishore Manne <navam@...inx.com>
---
drivers/nvmem/Kconfig | 9 +++++
drivers/nvmem/Makefile | 2 ++
drivers/nvmem/zynqmp_nvmem.c | 85 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 96 insertions(+)
create mode 100644 drivers/nvmem/zynqmp_nvmem.c
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index ff505af064ba..a9349281d05a 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -175,4 +175,13 @@ config NVMEM_SNVS_LPGPR
This driver can also be built as a module. If so, the module
will be called nvmem-snvs-lpgpr.
+config NVMEM_ZYNQMP
+ bool "Xilinx ZYNQMP SoC nvmem firmware support"
+ depends on ARCH_ZYNQMP
+ help
+ This is a driver to access hardware related data like soc revision,
+ IDCODE... etc.
+
+ If sure, say yes. If unsure, say no.
+
endif
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index e54dcfa6565a..932b4cebcb6c 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -37,3 +37,5 @@ obj-$(CONFIG_MESON_MX_EFUSE) += nvmem_meson_mx_efuse.o
nvmem_meson_mx_efuse-y := meson-mx-efuse.o
obj-$(CONFIG_NVMEM_SNVS_LPGPR) += nvmem_snvs_lpgpr.o
nvmem_snvs_lpgpr-y := snvs_lpgpr.o
+obj-$(CONFIG_NVMEM_ZYNQMP) += nvmem_zynqmp_nvmem.o
+nvmem_zynqmp_nvmem-y := zynqmp_nvmem.o
diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
new file mode 100644
index 000000000000..206ec9bd775d
--- /dev/null
+++ b/drivers/nvmem/zynqmp_nvmem.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Xilinx, Inc.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/firmware/xilinx/zynqmp/firmware.h>
+
+#define SILICON_REVISION_MASK 0xF
+
+static int zynqmp_nvmem_read(void *context, unsigned int offset,
+ void *val, size_t bytes)
+{
+ int ret;
+ int idcode, version;
+ const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+ if (!eemi_ops || !eemi_ops->get_chipid)
+ return -ENXIO;
+
+ ret = eemi_ops->get_chipid(&idcode, &version);
+ if (ret < 0)
+ return ret;
+
+ pr_debug("Read chipid val %x %x\n", idcode, version);
+ *(int *)val = version & SILICON_REVISION_MASK;
+
+ return 0;
+}
+
+static struct nvmem_config econfig = {
+ .name = "zynqmp-nvmem",
+ .owner = THIS_MODULE,
+ .word_size = 1,
+ .size = 1,
+ .read_only = true,
+};
+
+static const struct of_device_id zynqmp_nvmem_match[] = {
+ { .compatible = "xlnx,zynqmp-nvmem-fw", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match);
+
+static int zynqmp_nvmem_probe(struct platform_device *pdev)
+{
+ struct nvmem_device *nvmem;
+
+ econfig.dev = &pdev->dev;
+ econfig.reg_read = zynqmp_nvmem_read;
+
+ nvmem = nvmem_register(&econfig);
+ if (IS_ERR(nvmem))
+ return PTR_ERR(nvmem);
+
+ platform_set_drvdata(pdev, nvmem);
+
+ return 0;
+}
+
+static int zynqmp_nvmem_remove(struct platform_device *pdev)
+{
+ struct nvmem_device *nvmem = platform_get_drvdata(pdev);
+
+ return nvmem_unregister(nvmem);
+}
+
+static struct platform_driver zynqmp_nvmem_driver = {
+ .probe = zynqmp_nvmem_probe,
+ .remove = zynqmp_nvmem_remove,
+ .driver = {
+ .name = "zynqmp-nvmem",
+ .of_match_table = zynqmp_nvmem_match,
+ },
+};
+
+module_platform_driver(zynqmp_nvmem_driver);
+
+MODULE_AUTHOR("Michal Simek <michal.simek@...inx.com>, Nava kishore Manne <navam@...inx.com>");
+MODULE_DESCRIPTION("ZynqMP NVMEM driver");
+MODULE_LICENSE("GPL");
--
2.16.1
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