[dm][nvmem] support nvmem

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

Signed-off-by: GuEe-GUI <[email protected]>

2 files changed, 85 insertions, 0 deletions

diff --git a/components/drivers/include/drivers/nvmem.h b/components/drivers/include/drivers/nvmem.h
new file mode 100644
index 0000000000..39aa04be97
--- /dev/null
+++ b/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__ */
diff --git a/components/drivers/include/rtdevice.h b/components/drivers/include/rtdevice.h
index 9f427c49c4..88a388b6f0 100644
--- a/components/drivers/include/rtdevice.h
+++ b/components/drivers/include/rtdevice.h
@@ -125,6 +125,10 @@ 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