2 * Copyright (c) 2016, Linaro Ltd
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
15 #include <linux/module.h>
17 #include <linux/of_address.h>
18 #include <linux/interrupt.h>
19 #include <linux/platform_device.h>
20 #include <linux/mfd/syscon.h>
21 #include <linux/slab.h>
22 #include <linux/rpmsg.h>
23 #include <linux/idr.h>
24 #include <linux/circ_buf.h>
25 #include <linux/soc/qcom/smem.h>
26 #include <linux/sizes.h>
27 #include <linux/delay.h>
28 #include <linux/regmap.h>
29 #include <linux/workqueue.h>
30 #include <linux/list.h>
32 #include <linux/delay.h>
33 #include <linux/rpmsg.h>
34 #include <linux/rpmsg/qcom_glink.h>
36 #include "qcom_glink_native.h"
38 #define FIFO_FULL_RESERVE 8
39 #define FIFO_ALIGNMENT 8
40 #define TX_BLOCKED_CMD_RESERVE 8 /* size of struct read_notif_request */
42 #define SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR 478
43 #define SMEM_GLINK_NATIVE_XPRT_FIFO_0 479
44 #define SMEM_GLINK_NATIVE_XPRT_FIFO_1 480
46 struct glink_smem_pipe {
47 struct qcom_glink_pipe native;
57 #define to_smem_pipe(p) container_of(p, struct glink_smem_pipe, native)
59 static size_t glink_smem_rx_avail(struct qcom_glink_pipe *np)
61 struct glink_smem_pipe *pipe = to_smem_pipe(np);
68 fifo = qcom_smem_get(pipe->remote_pid,
69 SMEM_GLINK_NATIVE_XPRT_FIFO_1, &len);
71 pr_err("failed to acquire RX fifo handle: %ld\n",
77 pipe->native.length = len;
80 head = le32_to_cpu(*pipe->head);
81 tail = le32_to_cpu(*pipe->tail);
84 return pipe->native.length - tail + head;
89 static void glink_smem_rx_peak(struct qcom_glink_pipe *np,
90 void *data, unsigned int offset, size_t count)
92 struct glink_smem_pipe *pipe = to_smem_pipe(np);
96 tail = le32_to_cpu(*pipe->tail);
98 if (tail >= pipe->native.length)
99 tail -= pipe->native.length;
101 len = min_t(size_t, count, pipe->native.length - tail);
103 memcpy_fromio(data, pipe->fifo + tail, len);
106 memcpy_fromio(data + len, pipe->fifo, (count - len));
109 static void glink_smem_rx_advance(struct qcom_glink_pipe *np,
112 struct glink_smem_pipe *pipe = to_smem_pipe(np);
115 tail = le32_to_cpu(*pipe->tail);
118 if (tail >= pipe->native.length)
119 tail -= pipe->native.length;
121 *pipe->tail = cpu_to_le32(tail);
124 static size_t glink_smem_tx_avail(struct qcom_glink_pipe *np)
126 struct glink_smem_pipe *pipe = to_smem_pipe(np);
131 head = le32_to_cpu(*pipe->head);
132 tail = le32_to_cpu(*pipe->tail);
135 avail = pipe->native.length - head + tail;
139 if (avail < (FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE))
142 avail -= FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE;
147 static unsigned int glink_smem_tx_write_one(struct glink_smem_pipe *pipe,
149 const void *data, size_t count)
153 len = min_t(size_t, count, pipe->native.length - head);
155 memcpy(pipe->fifo + head, data, len);
158 memcpy(pipe->fifo, data + len, count - len);
161 if (head >= pipe->native.length)
162 head -= pipe->native.length;
167 static void glink_smem_tx_write(struct qcom_glink_pipe *glink_pipe,
168 const void *hdr, size_t hlen,
169 const void *data, size_t dlen)
171 struct glink_smem_pipe *pipe = to_smem_pipe(glink_pipe);
174 head = le32_to_cpu(*pipe->head);
176 head = glink_smem_tx_write_one(pipe, head, hdr, hlen);
177 head = glink_smem_tx_write_one(pipe, head, data, dlen);
179 /* Ensure head is always aligned to 8 bytes */
180 head = ALIGN(head, 8);
181 if (head >= pipe->native.length)
182 head -= pipe->native.length;
184 /* Ensure ordering of fifo and head update */
187 *pipe->head = cpu_to_le32(head);
190 static void qcom_glink_smem_release(struct device *dev)
195 struct qcom_glink *qcom_glink_smem_register(struct device *parent,
196 struct device_node *node)
198 struct glink_smem_pipe *rx_pipe;
199 struct glink_smem_pipe *tx_pipe;
200 struct qcom_glink *glink;
207 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
209 return ERR_PTR(-ENOMEM);
211 dev->parent = parent;
213 dev->release = qcom_glink_smem_release;
214 dev_set_name(dev, "%s:%s", node->parent->name, node->name);
215 ret = device_register(dev);
217 pr_err("failed to register glink edge\n");
222 ret = of_property_read_u32(dev->of_node, "qcom,remote-pid",
225 dev_err(dev, "failed to parse qcom,remote-pid\n");
229 rx_pipe = devm_kzalloc(dev, sizeof(*rx_pipe), GFP_KERNEL);
230 tx_pipe = devm_kzalloc(dev, sizeof(*tx_pipe), GFP_KERNEL);
231 if (!rx_pipe || !tx_pipe) {
236 ret = qcom_smem_alloc(remote_pid,
237 SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, 32);
238 if (ret && ret != -EEXIST) {
239 dev_err(dev, "failed to allocate glink descriptors\n");
243 descs = qcom_smem_get(remote_pid,
244 SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, &size);
246 dev_err(dev, "failed to acquire xprt descriptor\n");
247 ret = PTR_ERR(descs);
252 dev_err(dev, "glink descriptor of invalid size\n");
257 tx_pipe->tail = &descs[0];
258 tx_pipe->head = &descs[1];
259 rx_pipe->tail = &descs[2];
260 rx_pipe->head = &descs[3];
262 ret = qcom_smem_alloc(remote_pid, SMEM_GLINK_NATIVE_XPRT_FIFO_0,
264 if (ret && ret != -EEXIST) {
265 dev_err(dev, "failed to allocate TX fifo\n");
269 tx_pipe->fifo = qcom_smem_get(remote_pid, SMEM_GLINK_NATIVE_XPRT_FIFO_0,
270 &tx_pipe->native.length);
271 if (IS_ERR(tx_pipe->fifo)) {
272 dev_err(dev, "failed to acquire TX fifo\n");
273 ret = PTR_ERR(tx_pipe->fifo);
277 rx_pipe->native.avail = glink_smem_rx_avail;
278 rx_pipe->native.peak = glink_smem_rx_peak;
279 rx_pipe->native.advance = glink_smem_rx_advance;
280 rx_pipe->remote_pid = remote_pid;
282 tx_pipe->native.avail = glink_smem_tx_avail;
283 tx_pipe->native.write = glink_smem_tx_write;
284 tx_pipe->remote_pid = remote_pid;
289 glink = qcom_glink_native_probe(dev,
290 GLINK_FEATURE_INTENT_REUSE,
291 &rx_pipe->native, &tx_pipe->native,
294 ret = PTR_ERR(glink);
301 device_unregister(dev);
305 EXPORT_SYMBOL_GPL(qcom_glink_smem_register);
307 void qcom_glink_smem_unregister(struct qcom_glink *glink)
309 qcom_glink_native_remove(glink);
310 qcom_glink_native_unregister(glink);
312 EXPORT_SYMBOL_GPL(qcom_glink_smem_unregister);
314 MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@linaro.org>");
315 MODULE_DESCRIPTION("Qualcomm GLINK SMEM driver");
316 MODULE_LICENSE("GPL v2");