/*
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* Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mailbox_controller.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <soc/rockchip/rk3368-mailbox.h>
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#include <soc/rockchip/scpi.h>
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#define MAILBOX_VERSION "V1.00"
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#define MAILBOX_A2B_INTEN 0x00
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#define MAILBOX_A2B_STATUS 0x04
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#define MAILBOX_A2B_CMD(x) (0x08 + (x) * 8)
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#define MAILBOX_A2B_DAT(x) (0x0c + (x) * 8)
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#define MAILBOX_B2A_INTEN 0x28
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#define MAILBOX_B2A_STATUS 0x2C
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#define MAILBOX_B2A_CMD(x) (0x30 + (x) * 8)
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#define MAILBOX_B2A_DAT(x) (0x34 + (x) * 8)
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#define MAILBOX_ATOMIC_LOCK(x) (0x100 + (x) * 8)
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/* A2B: 0 - 2k */
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#define A2B_BUF(size, idx) ((idx) * (size))
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/* B2A: 2k - 4k */
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#define B2A_BUF(size, idx) (((idx) + 4) * (size))
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struct rk3368_mbox_drv_data {
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int num_chans;
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};
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struct rk3368_mbox_chan {
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int idx;
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struct rk3368_mbox_msg *msg;
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struct rk3368_mbox *mb;
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};
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struct rk3368_mbox {
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struct mbox_controller mbox;
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struct clk *pclk;
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void __iomem *mbox_base;
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/* The base address of share memory to transfer data */
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void __iomem *buf_base;
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/* The maximum size of buf for each channel */
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u32 buf_size;
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struct rk3368_mbox_chan *chans;
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};
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#define MBOX_CHAN_NUMS 4
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int idx_map_irq[MBOX_CHAN_NUMS] = {0, 0, 0, 0};
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static inline int chan_to_idx(struct rk3368_mbox *mb,
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struct mbox_chan *chan)
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{
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return (chan - mb->mbox.chans);
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}
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static int rk3368_mbox_send_data(struct mbox_chan *chan, void *data)
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{
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struct rk3368_mbox *mb = dev_get_drvdata(chan->mbox->dev);
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struct rk3368_mbox_msg *msg = data;
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int idx = chan_to_idx(mb, chan);
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if (!msg)
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return -EINVAL;
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if ((msg->tx_size > mb->buf_size) ||
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(msg->rx_size > mb->buf_size)) {
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dev_err(mb->mbox.dev, "Transmit size over buf size(%d)\n",
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mb->buf_size);
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return -EINVAL;
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}
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dev_dbg(mb->mbox.dev, "Chan[%d]: A2B message, cmd 0x%08x\n",
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idx, msg->cmd);
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mb->chans[idx].msg = msg;
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if (msg->tx_buf)
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memcpy(mb->buf_base + A2B_BUF(mb->buf_size, idx),
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msg->tx_buf, msg->tx_size);
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writel_relaxed(msg->cmd, mb->mbox_base + MAILBOX_A2B_CMD(idx));
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writel_relaxed(msg->rx_size, mb->mbox_base + MAILBOX_A2B_DAT(idx));
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return 0;
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}
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static int rk3368_mbox_startup(struct mbox_chan *chan)
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{
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return 0;
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}
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static void rk3368_mbox_shutdown(struct mbox_chan *chan)
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{
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struct rk3368_mbox *mb = dev_get_drvdata(chan->mbox->dev);
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int idx = chan_to_idx(mb, chan);
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mb->chans[idx].msg = NULL;
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}
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static struct mbox_chan_ops rk3368_mbox_chan_ops = {
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.send_data = rk3368_mbox_send_data,
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.startup = rk3368_mbox_startup,
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.shutdown = rk3368_mbox_shutdown,
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};
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static irqreturn_t rk3368_mbox_irq(int irq, void *dev_id)
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{
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int idx;
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struct rk3368_mbox *mb = (struct rk3368_mbox *)dev_id;
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u32 status = readl_relaxed(mb->mbox_base + MAILBOX_B2A_STATUS);
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for (idx = 0; idx < mb->mbox.num_chans; idx++) {
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if ((status & (1 << idx)) && (irq == idx_map_irq[idx])) {
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/* Clear mbox interrupt */
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writel_relaxed(1 << idx,
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mb->mbox_base + MAILBOX_B2A_STATUS);
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return IRQ_WAKE_THREAD;
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}
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}
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return IRQ_NONE;
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}
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static irqreturn_t rk3368_mbox_isr(int irq, void *dev_id)
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{
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int idx;
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struct rk3368_mbox_msg *msg = NULL;
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struct rk3368_mbox *mb = (struct rk3368_mbox *)dev_id;
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for (idx = 0; idx < mb->mbox.num_chans; idx++) {
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if (irq != idx_map_irq[idx])
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continue;
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msg = mb->chans[idx].msg;
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if (!msg) {
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dev_err(mb->mbox.dev,
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"Chan[%d]: B2A message is NULL\n", idx);
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break; /* spurious */
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}
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if (msg->rx_buf)
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memcpy(msg->rx_buf,
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mb->buf_base + B2A_BUF(mb->buf_size, idx),
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msg->rx_size);
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mbox_chan_received_data(&mb->mbox.chans[idx], msg);
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dev_dbg(mb->mbox.dev, "Chan[%d]: B2A message, cmd 0x%08x\n",
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idx, msg->cmd);
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break;
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}
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return IRQ_HANDLED;
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}
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static const struct rk3368_mbox_drv_data rk3368_drv_data = {
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.num_chans = 4,
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};
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static const struct of_device_id rk3368_mbox_of_match[] = {
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{
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.compatible = "rockchip,rk3368-mbox-legacy",
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.data = &rk3368_drv_data,
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, rockchp_mbox_of_match);
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#ifdef CONFIG_PM
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static int rk3368_mbox_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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struct rk3368_mbox *mb = platform_get_drvdata(pdev);
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if (scpi_sys_set_mcu_state_suspend())
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dev_err(mb->mbox.dev, "scpi_sys_set_mcu_state_suspend timeout.\n");
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return 0;
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}
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static int rk3368_mbox_resume(struct platform_device *pdev)
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{
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struct rk3368_mbox *mb = platform_get_drvdata(pdev);
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writel_relaxed((1 << mb->mbox.num_chans) - 1,
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mb->mbox_base + MAILBOX_B2A_INTEN);
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if (scpi_sys_set_mcu_state_resume())
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dev_err(mb->mbox.dev, "scpi_sys_set_mcu_state_resume timeout.\n");
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return 0;
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}
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#endif /* CONFIG_PM */
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static int rk3368_mbox_probe(struct platform_device *pdev)
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{
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struct rk3368_mbox *mb;
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const struct of_device_id *match;
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const struct rk3368_mbox_drv_data *drv_data;
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struct resource *res;
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int ret, irq, i;
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dev_info(&pdev->dev, "rk3368-mailbox initialized, version: %s\n",
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MAILBOX_VERSION);
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if (!pdev->dev.of_node)
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return -ENODEV;
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match = of_match_node(rk3368_mbox_of_match, pdev->dev.of_node);
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drv_data = (const struct rk3368_mbox_drv_data *)match->data;
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mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
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if (!mb)
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return -ENOMEM;
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mb->chans = devm_kcalloc(&pdev->dev, drv_data->num_chans,
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sizeof(*mb->chans), GFP_KERNEL);
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if (!mb->chans)
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return -ENOMEM;
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mb->mbox.chans = devm_kcalloc(&pdev->dev, drv_data->num_chans,
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sizeof(*mb->mbox.chans), GFP_KERNEL);
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if (!mb->mbox.chans)
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return -ENOMEM;
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platform_set_drvdata(pdev, mb);
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mb->mbox.dev = &pdev->dev;
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mb->mbox.num_chans = drv_data->num_chans;
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mb->mbox.ops = &rk3368_mbox_chan_ops;
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mb->mbox.txdone_irq = true;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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mb->mbox_base = devm_ioremap_resource(&pdev->dev, res);
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if (!mb->mbox_base)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res)
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return -ENODEV;
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/* Each channel has two buffers for A2B and B2A */
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mb->buf_size = resource_size(res) / (drv_data->num_chans * 2);
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mb->buf_base = devm_ioremap_resource(&pdev->dev, res);
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if (!mb->buf_base)
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return -ENOMEM;
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mb->pclk = devm_clk_get(&pdev->dev, "pclk_mailbox");
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if (IS_ERR(mb->pclk)) {
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ret = PTR_ERR(mb->pclk);
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dev_err(&pdev->dev, "failed to get pclk_mailbox clock: %d\n",
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ret);
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return ret;
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}
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ret = clk_prepare_enable(mb->pclk);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable pclk: %d\n", ret);
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return ret;
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}
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for (i = 0; i < mb->mbox.num_chans; i++) {
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irq = platform_get_irq(pdev, i);
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if (irq < 0)
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return irq;
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ret = devm_request_threaded_irq(&pdev->dev, irq,
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rk3368_mbox_irq,
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rk3368_mbox_isr, IRQF_ONESHOT,
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dev_name(&pdev->dev), mb);
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if (ret < 0)
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return ret;
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mb->chans[i].idx = i;
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mb->chans[i].mb = mb;
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mb->chans[i].msg = NULL;
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idx_map_irq[i] = irq;
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}
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/* Enable all B2A interrupts */
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writel_relaxed((1 << mb->mbox.num_chans) - 1,
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mb->mbox_base + MAILBOX_B2A_INTEN);
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ret = mbox_controller_register(&mb->mbox);
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if (ret < 0)
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dev_err(&pdev->dev, "Failed to register mailbox: %d\n", ret);
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return ret;
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}
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static int rk3368_mbox_remove(struct platform_device *pdev)
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{
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struct rk3368_mbox *mb = platform_get_drvdata(pdev);
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mbox_controller_unregister(&mb->mbox);
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return 0;
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}
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static struct platform_driver rk3368_mbox_driver = {
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.probe = rk3368_mbox_probe,
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.remove = rk3368_mbox_remove,
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#ifdef CONFIG_PM
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.suspend = rk3368_mbox_suspend,
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.resume = rk3368_mbox_resume,
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#endif /* CONFIG_PM */
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.driver = {
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.name = "rk3368-mailbox",
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.of_match_table = of_match_ptr(rk3368_mbox_of_match),
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},
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};
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static int __init rk3368_mbox_init(void)
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{
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return platform_driver_register(&rk3368_mbox_driver);
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}
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subsys_initcall(rk3368_mbox_init);
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