nvmem: zynqmp: Added zynqmp nvmem firmware driver

This patch adds zynqmp nvmem firmware driver to access the
SoC revision information from the hardware register.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 0a7a470..4ad846c 100644 (file)
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -192,4 +192,14 @@ config SC27XX_EFUSE
          This driver can also be built as a module. If so, the module
          will be called nvmem-sc27xx-efuse.
 
+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 by using the firmware
+         interface.
+
+         If sure, say yes. If unsure, say no.
+
 endif

diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 4e8c616..2ece8ff 100644 (file)
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -41,3 +41,5 @@ obj-$(CONFIG_RAVE_SP_EEPROM)  += nvmem-rave-sp-eeprom.o
 nvmem-rave-sp-eeprom-y         := rave-sp-eeprom.o
 obj-$(CONFIG_SC27XX_EFUSE)     += nvmem-sc27xx-efuse.o
 nvmem-sc27xx-efuse-y           := sc27xx-efuse.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 (file)
index 0000000..490c8fc
--- /dev/null
+++ b/drivers/nvmem/zynqmp_nvmem.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Xilinx, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+
+#define SILICON_REVISION_MASK 0xF
+
+struct zynqmp_nvmem_data {
+       struct device *dev;
+       struct nvmem_device *nvmem;
+};
+
+static int zynqmp_nvmem_read(void *context, unsigned int offset,
+                            void *val, size_t bytes)
+{
+       int ret;
+       int idcode, version;
+       struct zynqmp_nvmem_data *priv = context;
+
+       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;
+
+       dev_dbg(priv->dev, "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 device *dev = &pdev->dev;
+       struct zynqmp_nvmem_data *priv;
+
+       priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->dev = dev;
+       econfig.dev = dev;
+       econfig.reg_read = zynqmp_nvmem_read;
+       econfig.priv = priv;
+
+       priv->nvmem = devm_nvmem_register(dev, &econfig);
+
+       return PTR_ERR_OR_ZERO(priv->nvmem);
+}
+
+static struct platform_driver zynqmp_nvmem_driver = {
+       .probe = zynqmp_nvmem_probe,
+       .driver = {
+               .name = "zynqmp-nvmem",
+               .of_match_table = zynqmp_nvmem_match,
+       },
+};
+
+module_platform_driver(zynqmp_nvmem_driver);
+
+MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>");
+MODULE_DESCRIPTION("ZynqMP NVMEM driver");
+MODULE_LICENSE("GPL");