30  * @rb: ring buffer
36 void scif_rb_init(struct scif_rb *rb, u32 *read_ptr, u32 *write_ptr,  in scif_rb_init()  argument
39 	rb->rb_base = rb_base;  in scif_rb_init()
40 	rb->size = (1 << size);  in scif_rb_init()
41 	rb->read_ptr = read_ptr;  in scif_rb_init()
42 	rb->write_ptr = write_ptr;  in scif_rb_init()
43 	rb->current_read_offset = *read_ptr;  in scif_rb_init()
44 	rb->current_write_offset = *write_ptr;  in scif_rb_init()
48 static void memcpy_torb(struct scif_rb *rb, void *header,  in memcpy_torb()  argument
53 	if (header + size >= rb->rb_base + rb->size) {  in memcpy_torb()
55 		size1 = (u32)(rb->rb_base + rb->size - header);  in memcpy_torb()
58 		memcpy_toio((void __iomem __force *)rb->rb_base,  in memcpy_torb()
66 static void memcpy_fromrb(struct scif_rb *rb, void *header,  in memcpy_fromrb()  argument
71 	if (header + size >= rb->rb_base + rb->size) {  in memcpy_fromrb()
73 		size1 = (u32)(rb->rb_base + rb->size - header);  in memcpy_fromrb()
77 			      (void __iomem __force *)rb->rb_base, size2);  in memcpy_fromrb()
84  * scif_rb_space - Query space available for writing to the RB
85  * @rb: ring buffer
87  * Return: size available for writing to RB in bytes.
89 u32 scif_rb_space(struct scif_rb *rb)  in scif_rb_space()  argument
91 	rb->current_read_offset = *rb->read_ptr;  in scif_rb_space()
98 	return scif_rb_ring_space(rb->current_write_offset,  in scif_rb_space()
99 				  rb->current_read_offset, rb->size);  in scif_rb_space()
103  * scif_rb_write - Write a message to the RB
104  * @rb: ring buffer
106  * @size: the size (in bytes) to be copied to the RB
108  * This API does not block if there isn't enough space in the RB.
111 int scif_rb_write(struct scif_rb *rb, void *msg, u32 size)  in scif_rb_write()  argument
115 	if (scif_rb_space(rb) < size)  in scif_rb_write()
117 	header = rb->rb_base + rb->current_write_offset;  in scif_rb_write()
118 	memcpy_torb(rb, header, msg, size);  in scif_rb_write()
123 	rb->current_write_offset =  in scif_rb_write()
124 		(rb->current_write_offset + size) & (rb->size - 1);  in scif_rb_write()
130  * @rb: ring buffer
132 void scif_rb_commit(struct scif_rb *rb)  in scif_rb_commit()  argument
141 	WRITE_ONCE(*rb->write_ptr, rb->current_write_offset);  in scif_rb_commit()
150 	WRITE_ONCE(*rb->write_ptr, rb->current_write_offset);  in scif_rb_commit()
156  * @rb: ring buffer
162 static void *scif_rb_get(struct scif_rb *rb, u32 size)  in scif_rb_get()  argument
166 	if (scif_rb_count(rb, size) >= size)  in scif_rb_get()
167 		header = rb->rb_base + rb->current_read_offset;  in scif_rb_get()
173  * @rb: ring buffer
180 u32 scif_rb_get_next(struct scif_rb *rb, void *msg, u32 size)  in scif_rb_get_next()  argument
185 	header = scif_rb_get(rb, size);  in scif_rb_get_next()
188 			(rb->current_read_offset + size) & (rb->size - 1);  in scif_rb_get_next()
191 		rb->current_read_offset = next_cmd_offset;  in scif_rb_get_next()
192 		memcpy_fromrb(rb, header, msg, size);  in scif_rb_get_next()
199  * @rb: ring buffer
201 void scif_rb_update_read_ptr(struct scif_rb *rb)  in scif_rb_update_read_ptr()  argument
205 	new_offset = rb->current_read_offset;  in scif_rb_update_read_ptr()
213 	WRITE_ONCE(*rb->read_ptr, new_offset);  in scif_rb_update_read_ptr()
222 	WRITE_ONCE(*rb->read_ptr, new_offset);  in scif_rb_update_read_ptr()
228  * @rb: ring buffer
231  * Return: number of bytes that can be read from the RB
233 u32 scif_rb_count(struct scif_rb *rb, u32 size)  in scif_rb_count()  argument
235 	if (scif_rb_ring_cnt(rb->current_write_offset,  in scif_rb_count()
236 			     rb->current_read_offset,  in scif_rb_count()
237 			     rb->size) < size) {  in scif_rb_count()
238 		rb->current_write_offset = *rb->write_ptr;  in scif_rb_count()
246 	return scif_rb_ring_cnt(rb->current_write_offset,  in scif_rb_count()
247 				rb->current_read_offset,  in scif_rb_count()
248 				rb->size);  in scif_rb_count()