88 void msnd_fifo_init(msnd_fifo *f)  in msnd_fifo_init()  argument
90 	f->data = NULL;  in msnd_fifo_init()
93 void msnd_fifo_free(msnd_fifo *f)  in msnd_fifo_free()  argument
95 	vfree(f->data);  in msnd_fifo_free()
96 	f->data = NULL;  in msnd_fifo_free()
99 int msnd_fifo_alloc(msnd_fifo *f, size_t n)  in msnd_fifo_alloc()  argument
101 	msnd_fifo_free(f);  in msnd_fifo_alloc()
102 	f->data = vmalloc(n);  in msnd_fifo_alloc()
103 	f->n = n;  in msnd_fifo_alloc()
104 	f->tail = 0;  in msnd_fifo_alloc()
105 	f->head = 0;  in msnd_fifo_alloc()
106 	f->len = 0;  in msnd_fifo_alloc()
108 	if (!f->data)  in msnd_fifo_alloc()
114 void msnd_fifo_make_empty(msnd_fifo *f)  in msnd_fifo_make_empty()  argument
116 	f->len = f->tail = f->head = 0;  in msnd_fifo_make_empty()
119 int msnd_fifo_write_io(msnd_fifo *f, char __iomem *buf, size_t len)  in msnd_fifo_write_io()  argument
123 	while ((count < len) && (f->len != f->n)) {  in msnd_fifo_write_io()
127 		if (f->head <= f->tail) {  in msnd_fifo_write_io()
129 			if (nwritten > f->n - f->tail)  in msnd_fifo_write_io()
130 				nwritten = f->n - f->tail;  in msnd_fifo_write_io()
133 			nwritten = f->head - f->tail;  in msnd_fifo_write_io()
138 		memcpy_fromio(f->data + f->tail, buf, nwritten);  in msnd_fifo_write_io()
142 		f->len += nwritten;  in msnd_fifo_write_io()
143 		f->tail += nwritten;  in msnd_fifo_write_io()
144 		f->tail %= f->n;  in msnd_fifo_write_io()
150 int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len)  in msnd_fifo_write()  argument
154 	while ((count < len) && (f->len != f->n)) {  in msnd_fifo_write()
158 		if (f->head <= f->tail) {  in msnd_fifo_write()
160 			if (nwritten > f->n - f->tail)  in msnd_fifo_write()
161 				nwritten = f->n - f->tail;  in msnd_fifo_write()
164 			nwritten = f->head - f->tail;  in msnd_fifo_write()
169 		memcpy(f->data + f->tail, buf, nwritten);  in msnd_fifo_write()
173 		f->len += nwritten;  in msnd_fifo_write()
174 		f->tail += nwritten;  in msnd_fifo_write()
175 		f->tail %= f->n;  in msnd_fifo_write()
181 int msnd_fifo_read_io(msnd_fifo *f, char __iomem *buf, size_t len)  in msnd_fifo_read_io()  argument
185 	while ((count < len) && (f->len > 0)) {  in msnd_fifo_read_io()
189 		if (f->tail <= f->head) {  in msnd_fifo_read_io()
191 			if (nread > f->n - f->head)  in msnd_fifo_read_io()
192 				nread = f->n - f->head;  in msnd_fifo_read_io()
195 			nread = f->tail - f->head;  in msnd_fifo_read_io()
200 		memcpy_toio(buf, f->data + f->head, nread);  in msnd_fifo_read_io()
204 		f->len -= nread;  in msnd_fifo_read_io()
205 		f->head += nread;  in msnd_fifo_read_io()
206 		f->head %= f->n;  in msnd_fifo_read_io()
212 int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len)  in msnd_fifo_read()  argument
216 	while ((count < len) && (f->len > 0)) {  in msnd_fifo_read()
220 		if (f->tail <= f->head) {  in msnd_fifo_read()
222 			if (nread > f->n - f->head)  in msnd_fifo_read()
223 				nread = f->n - f->head;  in msnd_fifo_read()
226 			nread = f->tail - f->head;  in msnd_fifo_read()
231 		memcpy(buf, f->data + f->head, nread);  in msnd_fifo_read()
235 		f->len -= nread;  in msnd_fifo_read()
236 		f->head += nread;  in msnd_fifo_read()
237 		f->head %= f->n;  in msnd_fifo_read()