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184 lines
4.6 KiB
184 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2022 MediaTek Corporation. All rights reserved. |
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* Author: Allen-KH Cheng <[email protected]> |
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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/iopoll.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/slab.h> |
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struct mtk_adsp_mbox_priv { |
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struct device *dev; |
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struct mbox_controller mbox; |
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void __iomem *va_mboxreg; |
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const struct mtk_adsp_mbox_cfg *cfg; |
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}; |
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struct mtk_adsp_mbox_cfg { |
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u32 set_in; |
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u32 set_out; |
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u32 clr_in; |
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u32 clr_out; |
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}; |
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static inline struct mtk_adsp_mbox_priv *get_mtk_adsp_mbox_priv(struct mbox_controller *mbox) |
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{ |
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return container_of(mbox, struct mtk_adsp_mbox_priv, mbox); |
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} |
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static irqreturn_t mtk_adsp_mbox_irq(int irq, void *data) |
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{ |
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struct mbox_chan *chan = data; |
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struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); |
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u32 op = readl(priv->va_mboxreg + priv->cfg->set_out); |
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writel(op, priv->va_mboxreg + priv->cfg->clr_out); |
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return IRQ_WAKE_THREAD; |
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} |
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static irqreturn_t mtk_adsp_mbox_isr(int irq, void *data) |
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{ |
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struct mbox_chan *chan = data; |
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mbox_chan_received_data(chan, NULL); |
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return IRQ_HANDLED; |
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} |
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static struct mbox_chan *mtk_adsp_mbox_xlate(struct mbox_controller *mbox, |
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const struct of_phandle_args *sp) |
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{ |
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return mbox->chans; |
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} |
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static int mtk_adsp_mbox_startup(struct mbox_chan *chan) |
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{ |
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struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); |
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/* Clear ADSP mbox command */ |
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writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in); |
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writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out); |
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return 0; |
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} |
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static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan) |
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{ |
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struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); |
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/* Clear ADSP mbox command */ |
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writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in); |
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writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out); |
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} |
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static int mtk_adsp_mbox_send_data(struct mbox_chan *chan, void *data) |
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{ |
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struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); |
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u32 *msg = data; |
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writel(*msg, priv->va_mboxreg + priv->cfg->set_in); |
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return 0; |
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} |
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static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan) |
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{ |
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struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); |
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return readl(priv->va_mboxreg + priv->cfg->set_in) == 0; |
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} |
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static const struct mbox_chan_ops mtk_adsp_mbox_chan_ops = { |
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.send_data = mtk_adsp_mbox_send_data, |
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.startup = mtk_adsp_mbox_startup, |
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.shutdown = mtk_adsp_mbox_shutdown, |
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.last_tx_done = mtk_adsp_mbox_last_tx_done, |
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}; |
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static int mtk_adsp_mbox_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct mtk_adsp_mbox_priv *priv; |
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const struct mtk_adsp_mbox_cfg *cfg; |
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struct mbox_controller *mbox; |
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int ret, irq; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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mbox = &priv->mbox; |
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mbox->dev = dev; |
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mbox->ops = &mtk_adsp_mbox_chan_ops; |
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mbox->txdone_irq = false; |
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mbox->txdone_poll = true; |
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mbox->of_xlate = mtk_adsp_mbox_xlate; |
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mbox->num_chans = 1; |
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mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL); |
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if (!mbox->chans) |
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return -ENOMEM; |
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priv->va_mboxreg = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(priv->va_mboxreg)) |
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return PTR_ERR(priv->va_mboxreg); |
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cfg = of_device_get_match_data(dev); |
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if (!cfg) |
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return -EINVAL; |
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priv->cfg = cfg; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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ret = devm_request_threaded_irq(dev, irq, mtk_adsp_mbox_irq, |
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mtk_adsp_mbox_isr, IRQF_TRIGGER_NONE, |
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dev_name(dev), mbox->chans); |
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if (ret < 0) |
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return ret; |
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platform_set_drvdata(pdev, priv); |
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return devm_mbox_controller_register(dev, &priv->mbox); |
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} |
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static const struct mtk_adsp_mbox_cfg mt8186_adsp_mbox_cfg = { |
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.set_in = 0x00, |
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.set_out = 0x04, |
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.clr_in = 0x08, |
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.clr_out = 0x0C, |
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}; |
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static const struct mtk_adsp_mbox_cfg mt8195_adsp_mbox_cfg = { |
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.set_in = 0x00, |
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.set_out = 0x1c, |
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.clr_in = 0x04, |
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.clr_out = 0x20, |
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}; |
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static const struct of_device_id mtk_adsp_mbox_of_match[] = { |
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{ .compatible = "mediatek,mt8186-adsp-mbox", .data = &mt8186_adsp_mbox_cfg }, |
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{ .compatible = "mediatek,mt8195-adsp-mbox", .data = &mt8195_adsp_mbox_cfg }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, mtk_adsp_mbox_of_match); |
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static struct platform_driver mtk_adsp_mbox_driver = { |
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.probe = mtk_adsp_mbox_probe, |
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.driver = { |
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.name = "mtk_adsp_mbox", |
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.of_match_table = mtk_adsp_mbox_of_match, |
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}, |
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}; |
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module_platform_driver(mtk_adsp_mbox_driver); |
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MODULE_AUTHOR("Allen-KH Cheng <[email protected]>"); |
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MODULE_DESCRIPTION("MTK ADSP Mailbox Controller"); |
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MODULE_LICENSE("GPL v2");
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