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351 lines
7.9 KiB
351 lines
7.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2016-2017, Linaro Ltd |
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*/ |
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#include <linux/idr.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/list.h> |
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#include <linux/mfd/syscon.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/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/rpmsg.h> |
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#include <linux/slab.h> |
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#include <linux/workqueue.h> |
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#include <linux/mailbox_client.h> |
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#include "rpmsg_internal.h" |
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#include "qcom_glink_native.h" |
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#define RPM_TOC_SIZE 256 |
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#define RPM_TOC_MAGIC 0x67727430 /* grt0 */ |
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#define RPM_TOC_MAX_ENTRIES ((RPM_TOC_SIZE - sizeof(struct rpm_toc)) / \ |
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sizeof(struct rpm_toc_entry)) |
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#define RPM_TX_FIFO_ID 0x61703272 /* ap2r */ |
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#define RPM_RX_FIFO_ID 0x72326170 /* r2ap */ |
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#define to_rpm_pipe(p) container_of(p, struct glink_rpm_pipe, native) |
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struct rpm_toc_entry { |
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__le32 id; |
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__le32 offset; |
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__le32 size; |
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} __packed; |
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struct rpm_toc { |
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__le32 magic; |
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__le32 count; |
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struct rpm_toc_entry entries[]; |
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} __packed; |
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struct glink_rpm_pipe { |
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struct qcom_glink_pipe native; |
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void __iomem *tail; |
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void __iomem *head; |
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void __iomem *fifo; |
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}; |
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static size_t glink_rpm_rx_avail(struct qcom_glink_pipe *glink_pipe) |
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{ |
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struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe); |
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unsigned int head; |
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unsigned int tail; |
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head = readl(pipe->head); |
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tail = readl(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_rpm_rx_peak(struct qcom_glink_pipe *glink_pipe, |
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void *data, unsigned int offset, size_t count) |
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{ |
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struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe); |
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unsigned int tail; |
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size_t len; |
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tail = readl(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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__ioread32_copy(data, pipe->fifo + tail, |
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len / sizeof(u32)); |
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} |
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if (len != count) { |
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__ioread32_copy(data + len, pipe->fifo, |
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(count - len) / sizeof(u32)); |
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} |
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} |
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static void glink_rpm_rx_advance(struct qcom_glink_pipe *glink_pipe, |
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size_t count) |
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{ |
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struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe); |
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unsigned int tail; |
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tail = readl(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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writel(tail, pipe->tail); |
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} |
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static size_t glink_rpm_tx_avail(struct qcom_glink_pipe *glink_pipe) |
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{ |
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struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe); |
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unsigned int head; |
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unsigned int tail; |
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head = readl(pipe->head); |
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tail = readl(pipe->tail); |
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if (tail <= head) |
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return pipe->native.length - head + tail; |
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else |
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return tail - head; |
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} |
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static unsigned int glink_rpm_tx_write_one(struct glink_rpm_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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__iowrite32_copy(pipe->fifo + head, data, |
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len / sizeof(u32)); |
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} |
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if (len != count) { |
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__iowrite32_copy(pipe->fifo, data + len, |
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(count - len) / sizeof(u32)); |
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} |
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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_rpm_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_rpm_pipe *pipe = to_rpm_pipe(glink_pipe); |
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size_t tlen = hlen + dlen; |
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size_t aligned_dlen; |
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unsigned int head; |
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char padding[8] = {0}; |
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size_t pad; |
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/* Header length comes from glink native and is always 4 byte aligned */ |
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if (WARN(hlen % 4, "Glink Header length must be 4 bytes aligned\n")) |
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return; |
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/* |
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* Move the unaligned tail of the message to the padding chunk, to |
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* ensure word aligned accesses |
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*/ |
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aligned_dlen = ALIGN_DOWN(dlen, 4); |
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if (aligned_dlen != dlen) |
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memcpy(padding, data + aligned_dlen, dlen - aligned_dlen); |
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head = readl(pipe->head); |
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head = glink_rpm_tx_write_one(pipe, head, hdr, hlen); |
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head = glink_rpm_tx_write_one(pipe, head, data, aligned_dlen); |
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pad = ALIGN(tlen, 8) - ALIGN_DOWN(tlen, 4); |
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if (pad) |
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head = glink_rpm_tx_write_one(pipe, head, padding, pad); |
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writel(head, pipe->head); |
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} |
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static int glink_rpm_parse_toc(struct device *dev, |
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void __iomem *msg_ram, |
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size_t msg_ram_size, |
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struct glink_rpm_pipe *rx, |
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struct glink_rpm_pipe *tx) |
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{ |
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struct rpm_toc *toc; |
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int num_entries; |
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unsigned int id; |
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size_t offset; |
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size_t size; |
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void *buf; |
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int i; |
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buf = kzalloc(RPM_TOC_SIZE, GFP_KERNEL); |
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if (!buf) |
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return -ENOMEM; |
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__ioread32_copy(buf, msg_ram + msg_ram_size - RPM_TOC_SIZE, |
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RPM_TOC_SIZE / sizeof(u32)); |
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toc = buf; |
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if (le32_to_cpu(toc->magic) != RPM_TOC_MAGIC) { |
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dev_err(dev, "RPM TOC has invalid magic\n"); |
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goto err_inval; |
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} |
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num_entries = le32_to_cpu(toc->count); |
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if (num_entries > RPM_TOC_MAX_ENTRIES) { |
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dev_err(dev, "Invalid number of toc entries\n"); |
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goto err_inval; |
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} |
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for (i = 0; i < num_entries; i++) { |
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id = le32_to_cpu(toc->entries[i].id); |
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offset = le32_to_cpu(toc->entries[i].offset); |
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size = le32_to_cpu(toc->entries[i].size); |
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if (offset > msg_ram_size || offset + size > msg_ram_size) { |
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dev_err(dev, "TOC entry with invalid size\n"); |
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continue; |
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} |
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switch (id) { |
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case RPM_RX_FIFO_ID: |
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rx->native.length = size; |
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rx->tail = msg_ram + offset; |
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rx->head = msg_ram + offset + sizeof(u32); |
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rx->fifo = msg_ram + offset + 2 * sizeof(u32); |
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break; |
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case RPM_TX_FIFO_ID: |
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tx->native.length = size; |
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tx->tail = msg_ram + offset; |
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tx->head = msg_ram + offset + sizeof(u32); |
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tx->fifo = msg_ram + offset + 2 * sizeof(u32); |
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break; |
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} |
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} |
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if (!rx->fifo || !tx->fifo) { |
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dev_err(dev, "Unable to find rx and tx descriptors\n"); |
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goto err_inval; |
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} |
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kfree(buf); |
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return 0; |
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err_inval: |
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kfree(buf); |
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return -EINVAL; |
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} |
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static int glink_rpm_probe(struct platform_device *pdev) |
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{ |
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struct qcom_glink *glink; |
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struct glink_rpm_pipe *rx_pipe; |
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struct glink_rpm_pipe *tx_pipe; |
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struct device_node *np; |
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void __iomem *msg_ram; |
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size_t msg_ram_size; |
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struct device *dev = &pdev->dev; |
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struct resource r; |
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int ret; |
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rx_pipe = devm_kzalloc(&pdev->dev, sizeof(*rx_pipe), GFP_KERNEL); |
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tx_pipe = devm_kzalloc(&pdev->dev, sizeof(*tx_pipe), GFP_KERNEL); |
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if (!rx_pipe || !tx_pipe) |
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return -ENOMEM; |
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np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", 0); |
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ret = of_address_to_resource(np, 0, &r); |
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of_node_put(np); |
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if (ret) |
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return ret; |
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msg_ram = devm_ioremap(dev, r.start, resource_size(&r)); |
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msg_ram_size = resource_size(&r); |
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if (!msg_ram) |
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return -ENOMEM; |
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ret = glink_rpm_parse_toc(dev, msg_ram, msg_ram_size, |
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rx_pipe, tx_pipe); |
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if (ret) |
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return ret; |
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/* Pipe specific accessors */ |
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rx_pipe->native.avail = glink_rpm_rx_avail; |
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rx_pipe->native.peak = glink_rpm_rx_peak; |
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rx_pipe->native.advance = glink_rpm_rx_advance; |
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tx_pipe->native.avail = glink_rpm_tx_avail; |
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tx_pipe->native.write = glink_rpm_tx_write; |
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writel(0, tx_pipe->head); |
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writel(0, rx_pipe->tail); |
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glink = qcom_glink_native_probe(&pdev->dev, |
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0, |
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&rx_pipe->native, |
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&tx_pipe->native, |
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true); |
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if (IS_ERR(glink)) |
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return PTR_ERR(glink); |
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platform_set_drvdata(pdev, glink); |
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return 0; |
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} |
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static int glink_rpm_remove(struct platform_device *pdev) |
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{ |
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struct qcom_glink *glink = platform_get_drvdata(pdev); |
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qcom_glink_native_remove(glink); |
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return 0; |
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} |
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static const struct of_device_id glink_rpm_of_match[] = { |
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{ .compatible = "qcom,glink-rpm" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, glink_rpm_of_match); |
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static struct platform_driver glink_rpm_driver = { |
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.probe = glink_rpm_probe, |
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.remove = glink_rpm_remove, |
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.driver = { |
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.name = "qcom_glink_rpm", |
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.of_match_table = glink_rpm_of_match, |
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}, |
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}; |
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static int __init glink_rpm_init(void) |
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{ |
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return platform_driver_register(&glink_rpm_driver); |
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} |
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subsys_initcall(glink_rpm_init); |
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static void __exit glink_rpm_exit(void) |
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{ |
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platform_driver_unregister(&glink_rpm_driver); |
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} |
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module_exit(glink_rpm_exit); |
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MODULE_AUTHOR("Bjorn Andersson <[email protected]>"); |
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MODULE_DESCRIPTION("Qualcomm GLINK RPM driver"); |
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MODULE_LICENSE("GPL v2");
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