nvmem: add QTI SDAM driver

QTI SDAM driver allows PMIC peripherals to access the shared memory
that is available on QTI PMICs.

Use subsys_initcall as PMIC SDAM NV memory is accessed by multiple PMIC
drivers (charger, fuel gauge) to store/restore data across reboots
required during their initialization.

Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
Signed-off-by: Shyam Kumar Thella <sthella@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200116161100.30637-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/Kconfig

@@ -109,6 +109,14 @@ config QCOM_QFPROM
 	  This driver can also be built as a module. If so, the module
 	  will be called nvmem_qfprom.
 
+config NVMEM_SPMI_SDAM
+	tristate "SPMI SDAM Support"
+	depends on SPMI
+	help
+	  This driver supports the Shared Direct Access Memory Module on
+	  Qualcomm Technologies, Inc. PMICs. It provides the clients
+	  an interface to read/write to the SDAM module's shared memory.
+
 config ROCKCHIP_EFUSE
 	tristate "Rockchip eFuse Support"
 	depends on ARCH_ROCKCHIP || COMPILE_TEST

drivers/nvmem/Makefile

@@ -28,6 +28,8 @@ obj-$(CONFIG_MTK_EFUSE)		+= nvmem_mtk-efuse.o
 nvmem_mtk-efuse-y		:= mtk-efuse.o
 obj-$(CONFIG_QCOM_QFPROM)	+= nvmem_qfprom.o
 nvmem_qfprom-y			:= qfprom.o
+obj-$(CONFIG_NVMEM_SPMI_SDAM)	+= nvmem_qcom-spmi-sdam.o
+nvmem_qcom-spmi-sdam-y		+= qcom-spmi-sdam.o
 obj-$(CONFIG_ROCKCHIP_EFUSE)	+= nvmem_rockchip_efuse.o
 nvmem_rockchip_efuse-y		:= rockchip-efuse.o
 obj-$(CONFIG_ROCKCHIP_OTP)	+= nvmem-rockchip-otp.o

drivers/nvmem/qcom-spmi-sdam.c

@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017 The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/nvmem-provider.h>
+#include <linux/regmap.h>
+
+#define SDAM_MEM_START			0x40
+#define REGISTER_MAP_ID			0x40
+#define REGISTER_MAP_VERSION		0x41
+#define SDAM_SIZE			0x44
+#define SDAM_PBS_TRIG_SET		0xE5
+#define SDAM_PBS_TRIG_CLR		0xE6
+
+struct sdam_chip {
+	struct platform_device		*pdev;
+	struct regmap			*regmap;
+	struct nvmem_config		sdam_config;
+	unsigned int			base;
+	unsigned int			size;
+};
+
+/* read only register offsets */
+static const u8 sdam_ro_map[] = {
+	REGISTER_MAP_ID,
+	REGISTER_MAP_VERSION,
+	SDAM_SIZE
+};
+
+static bool sdam_is_valid(struct sdam_chip *sdam, unsigned int offset,
+				size_t len)
+{
+	unsigned int sdam_mem_end = SDAM_MEM_START + sdam->size - 1;
+
+	if (!len)
+		return false;
+
+	if (offset >= SDAM_MEM_START && offset <= sdam_mem_end
+				&& (offset + len - 1) <= sdam_mem_end)
+		return true;
+	else if ((offset == SDAM_PBS_TRIG_SET || offset == SDAM_PBS_TRIG_CLR)
+				&& (len == 1))
+		return true;
+
+	return false;
+}
+
+static bool sdam_is_ro(unsigned int offset, size_t len)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sdam_ro_map); i++)
+		if (offset <= sdam_ro_map[i] && (offset + len) > sdam_ro_map[i])
+			return true;
+
+	return false;
+}
+
+static int sdam_read(void *priv, unsigned int offset, void *val,
+				size_t bytes)
+{
+	struct sdam_chip *sdam = priv;
+	struct device *dev = &sdam->pdev->dev;
+	int rc;
+
+	if (!sdam_is_valid(sdam, offset, bytes)) {
+		dev_err(dev, "Invalid SDAM offset %#x len=%zd\n",
+			offset, bytes);
+		return -EINVAL;
+	}
+
+	rc = regmap_bulk_read(sdam->regmap, sdam->base + offset, val, bytes);
+	if (rc < 0)
+		dev_err(dev, "Failed to read SDAM offset %#x len=%zd, rc=%d\n",
+						offset, bytes, rc);
+
+	return rc;
+}
+
+static int sdam_write(void *priv, unsigned int offset, void *val,
+				size_t bytes)
+{
+	struct sdam_chip *sdam = priv;
+	struct device *dev = &sdam->pdev->dev;
+	int rc;
+
+	if (!sdam_is_valid(sdam, offset, bytes)) {
+		dev_err(dev, "Invalid SDAM offset %#x len=%zd\n",
+			offset, bytes);
+		return -EINVAL;
+	}
+
+	if (sdam_is_ro(offset, bytes)) {
+		dev_err(dev, "Invalid write offset %#x len=%zd\n",
+			offset, bytes);
+		return -EINVAL;
+	}
+
+	rc = regmap_bulk_write(sdam->regmap, sdam->base + offset, val, bytes);
+	if (rc < 0)
+		dev_err(dev, "Failed to write SDAM offset %#x len=%zd, rc=%d\n",
+						offset, bytes, rc);
+
+	return rc;
+}
+
+static int sdam_probe(struct platform_device *pdev)
+{
+	struct sdam_chip *sdam;
+	struct nvmem_device *nvmem;
+	unsigned int val;
+	int rc;
+
+	sdam = devm_kzalloc(&pdev->dev, sizeof(*sdam), GFP_KERNEL);
+	if (!sdam)
+		return -ENOMEM;
+
+	sdam->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!sdam->regmap) {
+		dev_err(&pdev->dev, "Failed to get regmap handle\n");
+		return -ENXIO;
+	}
+
+	rc = of_property_read_u32(pdev->dev.of_node, "reg", &sdam->base);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "Failed to get SDAM base, rc=%d\n", rc);
+		return -EINVAL;
+	}
+
+	rc = regmap_read(sdam->regmap, sdam->base + SDAM_SIZE, &val);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "Failed to read SDAM_SIZE rc=%d\n", rc);
+		return -EINVAL;
+	}
+	sdam->size = val * 32;
+
+	sdam->sdam_config.dev = &pdev->dev;
+	sdam->sdam_config.name = "spmi_sdam";
+	sdam->sdam_config.id = pdev->id;
+	sdam->sdam_config.owner = THIS_MODULE,
+	sdam->sdam_config.stride = 1;
+	sdam->sdam_config.word_size = 1;
+	sdam->sdam_config.reg_read = sdam_read;
+	sdam->sdam_config.reg_write = sdam_write;
+	sdam->sdam_config.priv = sdam;
+
+	nvmem = devm_nvmem_register(&pdev->dev, &sdam->sdam_config);
+	if (IS_ERR(nvmem)) {
+		dev_err(&pdev->dev,
+			"Failed to register SDAM nvmem device rc=%ld\n",
+			PTR_ERR(nvmem));
+		return -ENXIO;
+	}
+	dev_dbg(&pdev->dev,
+		"SDAM base=%#x size=%u registered successfully\n",
+		sdam->base, sdam->size);
+
+	return 0;
+}
+
+static const struct of_device_id sdam_match_table[] = {
+	{ .compatible = "qcom,spmi-sdam" },
+	{},
+};
+
+static struct platform_driver sdam_driver = {
+	.driver = {
+		.name = "qcom,spmi-sdam",
+		.of_match_table = sdam_match_table,
+	},
+	.probe		= sdam_probe,
+};
+
+static int __init sdam_init(void)
+{
+	return platform_driver_register(&sdam_driver);
+}
+subsys_initcall(sdam_init);
+
+static void __exit sdam_exit(void)
+{
+	return platform_driver_unregister(&sdam_driver);
+}
+module_exit(sdam_exit);
+
+MODULE_DESCRIPTION("QCOM SPMI SDAM driver");
+MODULE_LICENSE("GPL v2");