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177 lines
3.8 KiB
177 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd. |
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* Copyright (C) 2015 Linaro Ltd. |
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* Author: Jassi Brar <[email protected]> |
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*/ |
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#include <linux/amba/bus.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/mailbox_controller.h> |
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#include <linux/module.h> |
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#define INTR_STAT_OFS 0x0 |
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#define INTR_SET_OFS 0x8 |
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#define INTR_CLR_OFS 0x10 |
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#define MHU_LP_OFFSET 0x0 |
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#define MHU_HP_OFFSET 0x20 |
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#define MHU_SEC_OFFSET 0x200 |
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#define TX_REG_OFFSET 0x100 |
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#define MHU_CHANS 3 |
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struct mhu_link { |
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unsigned irq; |
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void __iomem *tx_reg; |
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void __iomem *rx_reg; |
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}; |
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struct arm_mhu { |
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void __iomem *base; |
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struct mhu_link mlink[MHU_CHANS]; |
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struct mbox_chan chan[MHU_CHANS]; |
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struct mbox_controller mbox; |
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}; |
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static irqreturn_t mhu_rx_interrupt(int irq, void *p) |
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{ |
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struct mbox_chan *chan = p; |
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struct mhu_link *mlink = chan->con_priv; |
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u32 val; |
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val = readl_relaxed(mlink->rx_reg + INTR_STAT_OFS); |
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if (!val) |
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return IRQ_NONE; |
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mbox_chan_received_data(chan, (void *)&val); |
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writel_relaxed(val, mlink->rx_reg + INTR_CLR_OFS); |
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return IRQ_HANDLED; |
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} |
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static bool mhu_last_tx_done(struct mbox_chan *chan) |
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{ |
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struct mhu_link *mlink = chan->con_priv; |
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u32 val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); |
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return (val == 0); |
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} |
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static int mhu_send_data(struct mbox_chan *chan, void *data) |
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{ |
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struct mhu_link *mlink = chan->con_priv; |
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u32 *arg = data; |
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writel_relaxed(*arg, mlink->tx_reg + INTR_SET_OFS); |
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return 0; |
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} |
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static int mhu_startup(struct mbox_chan *chan) |
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{ |
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struct mhu_link *mlink = chan->con_priv; |
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u32 val; |
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int ret; |
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val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); |
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writel_relaxed(val, mlink->tx_reg + INTR_CLR_OFS); |
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ret = request_irq(mlink->irq, mhu_rx_interrupt, |
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IRQF_SHARED, "mhu_link", chan); |
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if (ret) { |
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dev_err(chan->mbox->dev, |
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"Unable to acquire IRQ %d\n", mlink->irq); |
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return ret; |
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} |
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return 0; |
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} |
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static void mhu_shutdown(struct mbox_chan *chan) |
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{ |
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struct mhu_link *mlink = chan->con_priv; |
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free_irq(mlink->irq, chan); |
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} |
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static const struct mbox_chan_ops mhu_ops = { |
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.send_data = mhu_send_data, |
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.startup = mhu_startup, |
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.shutdown = mhu_shutdown, |
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.last_tx_done = mhu_last_tx_done, |
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}; |
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static int mhu_probe(struct amba_device *adev, const struct amba_id *id) |
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{ |
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int i, err; |
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struct arm_mhu *mhu; |
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struct device *dev = &adev->dev; |
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int mhu_reg[MHU_CHANS] = {MHU_LP_OFFSET, MHU_HP_OFFSET, MHU_SEC_OFFSET}; |
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if (!of_device_is_compatible(dev->of_node, "arm,mhu")) |
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return -ENODEV; |
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/* Allocate memory for device */ |
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mhu = devm_kzalloc(dev, sizeof(*mhu), GFP_KERNEL); |
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if (!mhu) |
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return -ENOMEM; |
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mhu->base = devm_ioremap_resource(dev, &adev->res); |
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if (IS_ERR(mhu->base)) { |
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dev_err(dev, "ioremap failed\n"); |
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return PTR_ERR(mhu->base); |
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} |
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for (i = 0; i < MHU_CHANS; i++) { |
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mhu->chan[i].con_priv = &mhu->mlink[i]; |
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mhu->mlink[i].irq = adev->irq[i]; |
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mhu->mlink[i].rx_reg = mhu->base + mhu_reg[i]; |
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mhu->mlink[i].tx_reg = mhu->mlink[i].rx_reg + TX_REG_OFFSET; |
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} |
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mhu->mbox.dev = dev; |
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mhu->mbox.chans = &mhu->chan[0]; |
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mhu->mbox.num_chans = MHU_CHANS; |
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mhu->mbox.ops = &mhu_ops; |
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mhu->mbox.txdone_irq = false; |
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mhu->mbox.txdone_poll = true; |
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mhu->mbox.txpoll_period = 1; |
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amba_set_drvdata(adev, mhu); |
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err = devm_mbox_controller_register(dev, &mhu->mbox); |
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if (err) { |
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dev_err(dev, "Failed to register mailboxes %d\n", err); |
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return err; |
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} |
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dev_info(dev, "ARM MHU Mailbox registered\n"); |
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return 0; |
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} |
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static struct amba_id mhu_ids[] = { |
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{ |
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.id = 0x1bb098, |
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.mask = 0xffffff, |
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}, |
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{ 0, 0 }, |
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}; |
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MODULE_DEVICE_TABLE(amba, mhu_ids); |
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static struct amba_driver arm_mhu_driver = { |
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.drv = { |
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.name = "mhu", |
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}, |
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.id_table = mhu_ids, |
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.probe = mhu_probe, |
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}; |
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module_amba_driver(arm_mhu_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("ARM MHU Driver"); |
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MODULE_AUTHOR("Jassi Brar <[email protected]>");
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