[dm][nvmem] support nvmem

Support for NVMEM(Non Volatile Memory) devices like EEPROM, EFUSES...

Signed-off-by: GuEe-GUI <2991707448@qq.com>

Author: GuEe-GUI

components/drivers/Kconfig

@@ -32,6 +32,7 @@ rsource "regulator/Kconfig"
 rsource "reset/Kconfig"
 rsource "thermal/Kconfig"
 rsource "virtio/Kconfig"
+rsource "nvmem/Kconfig"
 rsource "dma/Kconfig"
 rsource "mfd/Kconfig"
 rsource "ofw/Kconfig"

components/drivers/include/drivers/nvmem.h

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023-02-25     GuEe-GUI     the first version
+ */
+
+#ifndef __NVMEM_H__
+#define __NVMEM_H__
+
+#include <ref.h>
+
+#include <drivers/ofw.h>
+#include <drivers/core/dm.h>
+#include <drivers/core/driver.h>
+
+struct rt_nvmem_device
+{
+    struct rt_device parent;
+
+    int cells_nr;
+    rt_list_t cell_nodes;
+
+    rt_ssize_t (*reg_read)(struct rt_nvmem_device *, int offset, void *val, rt_size_t bytes);
+    rt_ssize_t (*reg_write)(struct rt_nvmem_device *, int offset, void *val, rt_size_t bytes);
+
+    rt_ssize_t size;
+    int word_size;
+    int stride;
+
+    rt_bool_t read_only;
+    rt_bool_t ignore_wp;
+    rt_base_t wp_pin;
+    rt_uint8_t wp_pin_active;
+
+    struct rt_ref ref;
+    struct rt_spinlock spinlock;
+
+    void *priv;
+};
+
+struct rt_nvmem_cell
+{
+    rt_list_t list;
+
+    int index;
+    const char *id;
+    const rt_bool_t free_able;
+
+    rt_uint32_t offset;
+    rt_uint32_t bytes;
+    rt_uint32_t bit_offset;
+    rt_uint32_t nbits;
+
+    struct rt_ref ref;
+
+    struct rt_ofw_node *np;
+    struct rt_nvmem_device *nvmem;
+};
+
+rt_err_t rt_nvmem_device_register(struct rt_nvmem_device *ndev);
+rt_err_t rt_nvmem_device_unregister(struct rt_nvmem_device *ndev);
+
+rt_err_t rt_nvmem_device_append_cell(struct rt_nvmem_device *ndev, struct rt_nvmem_cell *cell);
+
+rt_ssize_t rt_nvmem_cell_read(struct rt_nvmem_cell *cell, void *buffer, rt_size_t len);
+rt_ssize_t rt_nvmem_cell_write(struct rt_nvmem_cell *cell, void *buffer, rt_size_t len);
+
+rt_ssize_t rt_nvmem_cell_read_u8(struct rt_nvmem_cell *cell, rt_uint8_t *out_val);
+rt_ssize_t rt_nvmem_cell_read_u16(struct rt_nvmem_cell *cell, rt_uint16_t *out_val);
+rt_ssize_t rt_nvmem_cell_read_u32(struct rt_nvmem_cell *cell, rt_uint32_t *out_val);
+rt_ssize_t rt_nvmem_cell_read_u64(struct rt_nvmem_cell *cell, rt_uint64_t *out_val);
+
+struct rt_nvmem_cell *rt_nvmem_get_cell_by_index(struct rt_device *dev, int index);
+struct rt_nvmem_cell *rt_nvmem_get_cell_by_name(struct rt_device *dev, const char *id);
+void rt_nvmem_put_cell(struct rt_nvmem_cell *cell);
+
+#endif /* __NVMEM_H__ */

components/drivers/include/rtdevice.h

@@ -118,6 +118,10 @@ extern "C" {
 #ifdef RT_USING_THERMAL
 #include "drivers/thermal.h"
 #endif /* RT_USING_THERMAL */
+
+#ifdef RT_USING_NVMEM
+#include "drivers/nvmem.h"
+#endif /* RT_USING_NVMEM */
 #endif /* RT_USING_DM */
 
 #ifdef RT_USING_RTC

components/drivers/nvmem/Kconfig

@@ -0,0 +1,12 @@
+menuconfig RT_USING_NVMEM
+    bool "Using Non Volatile Memory (NVMEM) device drivers"
+    depends on RT_USING_DM
+    depends on RT_USING_OFW
+    depends on RT_USING_PIN
+    select RT_USING_ADT
+    select RT_USING_ADT_REF
+    default n
+
+if RT_USING_NVMEM
+    osource "$(SOC_DM_NVMEM_DIR)/Kconfig"
+endif

components/drivers/nvmem/SConscript

@@ -0,0 +1,15 @@
+from building import *
+
+group = []
+
+if not GetDepend(['RT_USING_NVMEM']):
+    Return('group')
+
+cwd = GetCurrentDir()
+CPPPATH = [cwd + '/../include']
+
+src = ['nvmem.c']
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')