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262 lines
6.3 KiB
262 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015, Fuzhou Rockchip Electronics Co., Ltd |
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*/ |
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#include <linux/clk.h> |
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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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#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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struct rockchip_mbox_msg { |
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u32 cmd; |
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int rx_size; |
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}; |
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struct rockchip_mbox_data { |
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int num_chans; |
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}; |
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struct rockchip_mbox_chan { |
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int idx; |
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int irq; |
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struct rockchip_mbox_msg *msg; |
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struct rockchip_mbox *mb; |
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}; |
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struct rockchip_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 maximum size of buf for each channel */ |
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u32 buf_size; |
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struct rockchip_mbox_chan *chans; |
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}; |
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static int rockchip_mbox_send_data(struct mbox_chan *chan, void *data) |
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{ |
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struct rockchip_mbox *mb = dev_get_drvdata(chan->mbox->dev); |
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struct rockchip_mbox_msg *msg = data; |
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struct rockchip_mbox_chan *chans = mb->chans; |
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if (!msg) |
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return -EINVAL; |
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if (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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chans->idx, msg->cmd); |
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mb->chans[chans->idx].msg = msg; |
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writel_relaxed(msg->cmd, mb->mbox_base + MAILBOX_A2B_CMD(chans->idx)); |
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writel_relaxed(msg->rx_size, mb->mbox_base + |
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MAILBOX_A2B_DAT(chans->idx)); |
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return 0; |
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} |
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static int rockchip_mbox_startup(struct mbox_chan *chan) |
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{ |
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struct rockchip_mbox *mb = dev_get_drvdata(chan->mbox->dev); |
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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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return 0; |
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} |
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static void rockchip_mbox_shutdown(struct mbox_chan *chan) |
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{ |
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struct rockchip_mbox *mb = dev_get_drvdata(chan->mbox->dev); |
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struct rockchip_mbox_chan *chans = mb->chans; |
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/* Disable all B2A interrupts */ |
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writel_relaxed(0, mb->mbox_base + MAILBOX_B2A_INTEN); |
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mb->chans[chans->idx].msg = NULL; |
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} |
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static const struct mbox_chan_ops rockchip_mbox_chan_ops = { |
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.send_data = rockchip_mbox_send_data, |
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.startup = rockchip_mbox_startup, |
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.shutdown = rockchip_mbox_shutdown, |
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}; |
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static irqreturn_t rockchip_mbox_irq(int irq, void *dev_id) |
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{ |
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int idx; |
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struct rockchip_mbox *mb = (struct rockchip_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 == mb->chans[idx].irq)) { |
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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 rockchip_mbox_isr(int irq, void *dev_id) |
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{ |
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int idx; |
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struct rockchip_mbox_msg *msg = NULL; |
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struct rockchip_mbox *mb = (struct rockchip_mbox *)dev_id; |
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for (idx = 0; idx < mb->mbox.num_chans; idx++) { |
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if (irq != mb->chans[idx].irq) |
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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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mbox_chan_received_data(&mb->mbox.chans[idx], msg); |
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mb->chans[idx].msg = NULL; |
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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 rockchip_mbox_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 rockchip_mbox_of_match[] = { |
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{ .compatible = "rockchip,rk3368-mailbox", .data = &rk3368_drv_data}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, rockchp_mbox_of_match); |
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static int rockchip_mbox_probe(struct platform_device *pdev) |
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{ |
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struct rockchip_mbox *mb; |
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const struct of_device_id *match; |
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const struct rockchip_mbox_data *drv_data; |
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struct resource *res; |
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int ret, irq, i; |
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if (!pdev->dev.of_node) |
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return -ENODEV; |
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match = of_match_node(rockchip_mbox_of_match, pdev->dev.of_node); |
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drv_data = (const struct rockchip_mbox_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 = &rockchip_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 (IS_ERR(mb->mbox_base)) |
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return PTR_ERR(mb->mbox_base); |
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/* Each channel has two buffers for A2B and B2A */ |
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mb->buf_size = (size_t)resource_size(res) / (drv_data->num_chans * 2); |
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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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rockchip_mbox_irq, |
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rockchip_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].irq = irq; |
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mb->chans[i].mb = mb; |
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mb->chans[i].msg = NULL; |
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} |
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ret = devm_mbox_controller_register(&pdev->dev, &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 struct platform_driver rockchip_mbox_driver = { |
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.probe = rockchip_mbox_probe, |
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.driver = { |
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.name = "rockchip-mailbox", |
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.of_match_table = of_match_ptr(rockchip_mbox_of_match), |
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}, |
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}; |
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module_platform_driver(rockchip_mbox_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("Rockchip mailbox: communicate between CPU cores and MCU"); |
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MODULE_AUTHOR("Addy Ke <[email protected]>"); |
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MODULE_AUTHOR("Caesar Wang <[email protected]>");
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