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306 lines
6.9 KiB
306 lines
6.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2016, Linaro Ltd |
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*/ |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/slab.h> |
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#include <linux/rpmsg.h> |
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#include <linux/idr.h> |
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#include <linux/circ_buf.h> |
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#include <linux/soc/qcom/smem.h> |
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#include <linux/sizes.h> |
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#include <linux/delay.h> |
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#include <linux/regmap.h> |
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#include <linux/workqueue.h> |
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#include <linux/list.h> |
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#include <linux/rpmsg/qcom_glink.h> |
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#include "qcom_glink_native.h" |
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#define FIFO_FULL_RESERVE 8 |
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#define FIFO_ALIGNMENT 8 |
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#define TX_BLOCKED_CMD_RESERVE 8 /* size of struct read_notif_request */ |
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#define SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR 478 |
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#define SMEM_GLINK_NATIVE_XPRT_FIFO_0 479 |
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#define SMEM_GLINK_NATIVE_XPRT_FIFO_1 480 |
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struct glink_smem_pipe { |
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struct qcom_glink_pipe native; |
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__le32 *tail; |
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__le32 *head; |
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void *fifo; |
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int remote_pid; |
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}; |
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#define to_smem_pipe(p) container_of(p, struct glink_smem_pipe, native) |
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static size_t glink_smem_rx_avail(struct qcom_glink_pipe *np) |
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{ |
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struct glink_smem_pipe *pipe = to_smem_pipe(np); |
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size_t len; |
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void *fifo; |
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u32 head; |
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u32 tail; |
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if (!pipe->fifo) { |
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fifo = qcom_smem_get(pipe->remote_pid, |
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SMEM_GLINK_NATIVE_XPRT_FIFO_1, &len); |
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if (IS_ERR(fifo)) { |
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pr_err("failed to acquire RX fifo handle: %ld\n", |
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PTR_ERR(fifo)); |
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return 0; |
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} |
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pipe->fifo = fifo; |
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pipe->native.length = len; |
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} |
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head = le32_to_cpu(*pipe->head); |
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tail = le32_to_cpu(*pipe->tail); |
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if (head < tail) |
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return pipe->native.length - tail + head; |
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else |
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return head - tail; |
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} |
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static void glink_smem_rx_peak(struct qcom_glink_pipe *np, |
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void *data, unsigned int offset, size_t count) |
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{ |
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struct glink_smem_pipe *pipe = to_smem_pipe(np); |
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size_t len; |
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u32 tail; |
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tail = le32_to_cpu(*pipe->tail); |
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tail += offset; |
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if (tail >= pipe->native.length) |
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tail -= pipe->native.length; |
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len = min_t(size_t, count, pipe->native.length - tail); |
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if (len) |
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memcpy_fromio(data, pipe->fifo + tail, len); |
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if (len != count) |
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memcpy_fromio(data + len, pipe->fifo, (count - len)); |
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} |
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static void glink_smem_rx_advance(struct qcom_glink_pipe *np, |
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size_t count) |
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{ |
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struct glink_smem_pipe *pipe = to_smem_pipe(np); |
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u32 tail; |
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tail = le32_to_cpu(*pipe->tail); |
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tail += count; |
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if (tail >= pipe->native.length) |
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tail -= pipe->native.length; |
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*pipe->tail = cpu_to_le32(tail); |
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} |
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static size_t glink_smem_tx_avail(struct qcom_glink_pipe *np) |
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{ |
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struct glink_smem_pipe *pipe = to_smem_pipe(np); |
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u32 head; |
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u32 tail; |
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u32 avail; |
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head = le32_to_cpu(*pipe->head); |
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tail = le32_to_cpu(*pipe->tail); |
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if (tail <= head) |
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avail = pipe->native.length - head + tail; |
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else |
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avail = tail - head; |
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if (avail < (FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE)) |
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avail = 0; |
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else |
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avail -= FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE; |
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return avail; |
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} |
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static unsigned int glink_smem_tx_write_one(struct glink_smem_pipe *pipe, |
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unsigned int head, |
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const void *data, size_t count) |
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{ |
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size_t len; |
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len = min_t(size_t, count, pipe->native.length - head); |
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if (len) |
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memcpy(pipe->fifo + head, data, len); |
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if (len != count) |
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memcpy(pipe->fifo, data + len, count - len); |
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head += count; |
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if (head >= pipe->native.length) |
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head -= pipe->native.length; |
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return head; |
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} |
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static void glink_smem_tx_write(struct qcom_glink_pipe *glink_pipe, |
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const void *hdr, size_t hlen, |
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const void *data, size_t dlen) |
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{ |
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struct glink_smem_pipe *pipe = to_smem_pipe(glink_pipe); |
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unsigned int head; |
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head = le32_to_cpu(*pipe->head); |
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head = glink_smem_tx_write_one(pipe, head, hdr, hlen); |
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head = glink_smem_tx_write_one(pipe, head, data, dlen); |
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/* Ensure head is always aligned to 8 bytes */ |
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head = ALIGN(head, 8); |
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if (head >= pipe->native.length) |
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head -= pipe->native.length; |
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/* Ensure ordering of fifo and head update */ |
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wmb(); |
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*pipe->head = cpu_to_le32(head); |
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} |
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static void qcom_glink_smem_release(struct device *dev) |
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{ |
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kfree(dev); |
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} |
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struct qcom_glink *qcom_glink_smem_register(struct device *parent, |
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struct device_node *node) |
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{ |
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struct glink_smem_pipe *rx_pipe; |
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struct glink_smem_pipe *tx_pipe; |
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struct qcom_glink *glink; |
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struct device *dev; |
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u32 remote_pid; |
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__le32 *descs; |
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size_t size; |
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int ret; |
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dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
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if (!dev) |
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return ERR_PTR(-ENOMEM); |
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dev->parent = parent; |
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dev->of_node = node; |
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dev->release = qcom_glink_smem_release; |
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dev_set_name(dev, "%s:%pOFn", dev_name(parent->parent), node); |
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ret = device_register(dev); |
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if (ret) { |
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pr_err("failed to register glink edge\n"); |
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put_device(dev); |
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return ERR_PTR(ret); |
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} |
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ret = of_property_read_u32(dev->of_node, "qcom,remote-pid", |
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&remote_pid); |
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if (ret) { |
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dev_err(dev, "failed to parse qcom,remote-pid\n"); |
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goto err_put_dev; |
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} |
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rx_pipe = devm_kzalloc(dev, sizeof(*rx_pipe), GFP_KERNEL); |
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tx_pipe = devm_kzalloc(dev, sizeof(*tx_pipe), GFP_KERNEL); |
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if (!rx_pipe || !tx_pipe) { |
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ret = -ENOMEM; |
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goto err_put_dev; |
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} |
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ret = qcom_smem_alloc(remote_pid, |
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SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, 32); |
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if (ret && ret != -EEXIST) { |
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dev_err(dev, "failed to allocate glink descriptors\n"); |
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goto err_put_dev; |
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} |
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descs = qcom_smem_get(remote_pid, |
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SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, &size); |
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if (IS_ERR(descs)) { |
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dev_err(dev, "failed to acquire xprt descriptor\n"); |
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ret = PTR_ERR(descs); |
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goto err_put_dev; |
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} |
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if (size != 32) { |
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dev_err(dev, "glink descriptor of invalid size\n"); |
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ret = -EINVAL; |
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goto err_put_dev; |
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} |
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tx_pipe->tail = &descs[0]; |
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tx_pipe->head = &descs[1]; |
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rx_pipe->tail = &descs[2]; |
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rx_pipe->head = &descs[3]; |
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ret = qcom_smem_alloc(remote_pid, SMEM_GLINK_NATIVE_XPRT_FIFO_0, |
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SZ_16K); |
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if (ret && ret != -EEXIST) { |
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dev_err(dev, "failed to allocate TX fifo\n"); |
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goto err_put_dev; |
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} |
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tx_pipe->fifo = qcom_smem_get(remote_pid, SMEM_GLINK_NATIVE_XPRT_FIFO_0, |
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&tx_pipe->native.length); |
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if (IS_ERR(tx_pipe->fifo)) { |
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dev_err(dev, "failed to acquire TX fifo\n"); |
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ret = PTR_ERR(tx_pipe->fifo); |
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goto err_put_dev; |
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} |
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rx_pipe->native.avail = glink_smem_rx_avail; |
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rx_pipe->native.peak = glink_smem_rx_peak; |
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rx_pipe->native.advance = glink_smem_rx_advance; |
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rx_pipe->remote_pid = remote_pid; |
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tx_pipe->native.avail = glink_smem_tx_avail; |
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tx_pipe->native.write = glink_smem_tx_write; |
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tx_pipe->remote_pid = remote_pid; |
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*rx_pipe->tail = 0; |
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*tx_pipe->head = 0; |
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glink = qcom_glink_native_probe(dev, |
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GLINK_FEATURE_INTENT_REUSE, |
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&rx_pipe->native, &tx_pipe->native, |
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false); |
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if (IS_ERR(glink)) { |
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ret = PTR_ERR(glink); |
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goto err_put_dev; |
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} |
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return glink; |
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err_put_dev: |
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device_unregister(dev); |
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return ERR_PTR(ret); |
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} |
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EXPORT_SYMBOL_GPL(qcom_glink_smem_register); |
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void qcom_glink_smem_unregister(struct qcom_glink *glink) |
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{ |
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qcom_glink_native_remove(glink); |
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qcom_glink_native_unregister(glink); |
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} |
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EXPORT_SYMBOL_GPL(qcom_glink_smem_unregister); |
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MODULE_AUTHOR("Bjorn Andersson <[email protected]>"); |
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MODULE_DESCRIPTION("Qualcomm GLINK SMEM driver"); |
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MODULE_LICENSE("GPL v2");
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