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373 lines
8.9 KiB
373 lines
8.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Hisilicon's Hi6220 mailbox driver |
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* |
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* Copyright (c) 2015 HiSilicon Limited. |
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* Copyright (c) 2015 Linaro Limited. |
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* |
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* Author: Leo Yan <[email protected]> |
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*/ |
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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/kfifo.h> |
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#include <linux/mailbox_controller.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#define MBOX_CHAN_MAX 32 |
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#define MBOX_TX 0x1 |
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/* Mailbox message length: 8 words */ |
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#define MBOX_MSG_LEN 8 |
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/* Mailbox Registers */ |
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#define MBOX_OFF(m) (0x40 * (m)) |
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#define MBOX_MODE_REG(m) (MBOX_OFF(m) + 0x0) |
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#define MBOX_DATA_REG(m) (MBOX_OFF(m) + 0x4) |
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#define MBOX_STATE_MASK (0xF << 4) |
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#define MBOX_STATE_IDLE (0x1 << 4) |
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#define MBOX_STATE_TX (0x2 << 4) |
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#define MBOX_STATE_RX (0x4 << 4) |
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#define MBOX_STATE_ACK (0x8 << 4) |
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#define MBOX_ACK_CONFIG_MASK (0x1 << 0) |
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#define MBOX_ACK_AUTOMATIC (0x1 << 0) |
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#define MBOX_ACK_IRQ (0x0 << 0) |
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/* IPC registers */ |
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#define ACK_INT_RAW_REG(i) ((i) + 0x400) |
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#define ACK_INT_MSK_REG(i) ((i) + 0x404) |
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#define ACK_INT_STAT_REG(i) ((i) + 0x408) |
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#define ACK_INT_CLR_REG(i) ((i) + 0x40c) |
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#define ACK_INT_ENA_REG(i) ((i) + 0x500) |
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#define ACK_INT_DIS_REG(i) ((i) + 0x504) |
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#define DST_INT_RAW_REG(i) ((i) + 0x420) |
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struct hi6220_mbox_chan { |
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/* |
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* Description for channel's hardware info: |
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* - direction: tx or rx |
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* - dst irq: peer core's irq number |
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* - ack irq: local irq number |
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* - slot number |
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*/ |
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unsigned int dir, dst_irq, ack_irq; |
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unsigned int slot; |
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struct hi6220_mbox *parent; |
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}; |
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struct hi6220_mbox { |
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struct device *dev; |
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int irq; |
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/* flag of enabling tx's irq mode */ |
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bool tx_irq_mode; |
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/* region for ipc event */ |
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void __iomem *ipc; |
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/* region for mailbox */ |
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void __iomem *base; |
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unsigned int chan_num; |
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struct hi6220_mbox_chan *mchan; |
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void *irq_map_chan[MBOX_CHAN_MAX]; |
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struct mbox_chan *chan; |
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struct mbox_controller controller; |
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}; |
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static void mbox_set_state(struct hi6220_mbox *mbox, |
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unsigned int slot, u32 val) |
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{ |
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u32 status; |
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status = readl(mbox->base + MBOX_MODE_REG(slot)); |
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status = (status & ~MBOX_STATE_MASK) | val; |
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writel(status, mbox->base + MBOX_MODE_REG(slot)); |
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} |
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static void mbox_set_mode(struct hi6220_mbox *mbox, |
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unsigned int slot, u32 val) |
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{ |
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u32 mode; |
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mode = readl(mbox->base + MBOX_MODE_REG(slot)); |
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mode = (mode & ~MBOX_ACK_CONFIG_MASK) | val; |
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writel(mode, mbox->base + MBOX_MODE_REG(slot)); |
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} |
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static bool hi6220_mbox_last_tx_done(struct mbox_chan *chan) |
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{ |
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struct hi6220_mbox_chan *mchan = chan->con_priv; |
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struct hi6220_mbox *mbox = mchan->parent; |
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u32 state; |
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/* Only set idle state for polling mode */ |
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BUG_ON(mbox->tx_irq_mode); |
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state = readl(mbox->base + MBOX_MODE_REG(mchan->slot)); |
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return ((state & MBOX_STATE_MASK) == MBOX_STATE_IDLE); |
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} |
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static int hi6220_mbox_send_data(struct mbox_chan *chan, void *msg) |
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{ |
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struct hi6220_mbox_chan *mchan = chan->con_priv; |
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struct hi6220_mbox *mbox = mchan->parent; |
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unsigned int slot = mchan->slot; |
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u32 *buf = msg; |
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int i; |
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/* indicate as a TX channel */ |
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mchan->dir = MBOX_TX; |
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mbox_set_state(mbox, slot, MBOX_STATE_TX); |
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if (mbox->tx_irq_mode) |
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mbox_set_mode(mbox, slot, MBOX_ACK_IRQ); |
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else |
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mbox_set_mode(mbox, slot, MBOX_ACK_AUTOMATIC); |
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for (i = 0; i < MBOX_MSG_LEN; i++) |
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writel(buf[i], mbox->base + MBOX_DATA_REG(slot) + i * 4); |
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/* trigger remote request */ |
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writel(BIT(mchan->dst_irq), DST_INT_RAW_REG(mbox->ipc)); |
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return 0; |
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} |
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static irqreturn_t hi6220_mbox_interrupt(int irq, void *p) |
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{ |
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struct hi6220_mbox *mbox = p; |
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struct hi6220_mbox_chan *mchan; |
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struct mbox_chan *chan; |
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unsigned int state, intr_bit, i; |
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u32 msg[MBOX_MSG_LEN]; |
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state = readl(ACK_INT_STAT_REG(mbox->ipc)); |
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if (!state) { |
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dev_warn(mbox->dev, "%s: spurious interrupt\n", |
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__func__); |
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return IRQ_HANDLED; |
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} |
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while (state) { |
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intr_bit = __ffs(state); |
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state &= (state - 1); |
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chan = mbox->irq_map_chan[intr_bit]; |
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if (!chan) { |
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dev_warn(mbox->dev, "%s: unexpected irq vector %d\n", |
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__func__, intr_bit); |
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continue; |
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} |
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mchan = chan->con_priv; |
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if (mchan->dir == MBOX_TX) |
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mbox_chan_txdone(chan, 0); |
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else { |
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for (i = 0; i < MBOX_MSG_LEN; i++) |
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msg[i] = readl(mbox->base + |
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MBOX_DATA_REG(mchan->slot) + i * 4); |
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mbox_chan_received_data(chan, (void *)msg); |
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} |
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/* clear IRQ source */ |
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writel(BIT(mchan->ack_irq), ACK_INT_CLR_REG(mbox->ipc)); |
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mbox_set_state(mbox, mchan->slot, MBOX_STATE_IDLE); |
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} |
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return IRQ_HANDLED; |
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} |
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static int hi6220_mbox_startup(struct mbox_chan *chan) |
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{ |
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struct hi6220_mbox_chan *mchan = chan->con_priv; |
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struct hi6220_mbox *mbox = mchan->parent; |
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mchan->dir = 0; |
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/* enable interrupt */ |
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writel(BIT(mchan->ack_irq), ACK_INT_ENA_REG(mbox->ipc)); |
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return 0; |
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} |
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static void hi6220_mbox_shutdown(struct mbox_chan *chan) |
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{ |
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struct hi6220_mbox_chan *mchan = chan->con_priv; |
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struct hi6220_mbox *mbox = mchan->parent; |
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/* disable interrupt */ |
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writel(BIT(mchan->ack_irq), ACK_INT_DIS_REG(mbox->ipc)); |
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mbox->irq_map_chan[mchan->ack_irq] = NULL; |
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} |
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static const struct mbox_chan_ops hi6220_mbox_ops = { |
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.send_data = hi6220_mbox_send_data, |
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.startup = hi6220_mbox_startup, |
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.shutdown = hi6220_mbox_shutdown, |
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.last_tx_done = hi6220_mbox_last_tx_done, |
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}; |
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static struct mbox_chan *hi6220_mbox_xlate(struct mbox_controller *controller, |
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const struct of_phandle_args *spec) |
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{ |
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struct hi6220_mbox *mbox = dev_get_drvdata(controller->dev); |
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struct hi6220_mbox_chan *mchan; |
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struct mbox_chan *chan; |
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unsigned int i = spec->args[0]; |
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unsigned int dst_irq = spec->args[1]; |
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unsigned int ack_irq = spec->args[2]; |
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/* Bounds checking */ |
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if (i >= mbox->chan_num || dst_irq >= mbox->chan_num || |
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ack_irq >= mbox->chan_num) { |
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dev_err(mbox->dev, |
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"Invalid channel idx %d dst_irq %d ack_irq %d\n", |
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i, dst_irq, ack_irq); |
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return ERR_PTR(-EINVAL); |
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} |
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/* Is requested channel free? */ |
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chan = &mbox->chan[i]; |
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if (mbox->irq_map_chan[ack_irq] == (void *)chan) { |
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dev_err(mbox->dev, "Channel in use\n"); |
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return ERR_PTR(-EBUSY); |
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} |
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mchan = chan->con_priv; |
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mchan->dst_irq = dst_irq; |
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mchan->ack_irq = ack_irq; |
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mbox->irq_map_chan[ack_irq] = (void *)chan; |
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return chan; |
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} |
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static const struct of_device_id hi6220_mbox_of_match[] = { |
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{ .compatible = "hisilicon,hi6220-mbox", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, hi6220_mbox_of_match); |
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static int hi6220_mbox_probe(struct platform_device *pdev) |
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{ |
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struct device_node *node = pdev->dev.of_node; |
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struct device *dev = &pdev->dev; |
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struct hi6220_mbox *mbox; |
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int i, err; |
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mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL); |
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if (!mbox) |
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return -ENOMEM; |
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mbox->dev = dev; |
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mbox->chan_num = MBOX_CHAN_MAX; |
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mbox->mchan = devm_kcalloc(dev, |
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mbox->chan_num, sizeof(*mbox->mchan), GFP_KERNEL); |
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if (!mbox->mchan) |
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return -ENOMEM; |
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mbox->chan = devm_kcalloc(dev, |
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mbox->chan_num, sizeof(*mbox->chan), GFP_KERNEL); |
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if (!mbox->chan) |
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return -ENOMEM; |
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mbox->irq = platform_get_irq(pdev, 0); |
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if (mbox->irq < 0) |
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return mbox->irq; |
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mbox->ipc = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(mbox->ipc)) { |
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dev_err(dev, "ioremap ipc failed\n"); |
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return PTR_ERR(mbox->ipc); |
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} |
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mbox->base = devm_platform_ioremap_resource(pdev, 1); |
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if (IS_ERR(mbox->base)) { |
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dev_err(dev, "ioremap buffer failed\n"); |
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return PTR_ERR(mbox->base); |
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} |
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err = devm_request_irq(dev, mbox->irq, hi6220_mbox_interrupt, 0, |
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dev_name(dev), mbox); |
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if (err) { |
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dev_err(dev, "Failed to register a mailbox IRQ handler: %d\n", |
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err); |
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return -ENODEV; |
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} |
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mbox->controller.dev = dev; |
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mbox->controller.chans = &mbox->chan[0]; |
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mbox->controller.num_chans = mbox->chan_num; |
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mbox->controller.ops = &hi6220_mbox_ops; |
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mbox->controller.of_xlate = hi6220_mbox_xlate; |
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for (i = 0; i < mbox->chan_num; i++) { |
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mbox->chan[i].con_priv = &mbox->mchan[i]; |
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mbox->irq_map_chan[i] = NULL; |
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mbox->mchan[i].parent = mbox; |
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mbox->mchan[i].slot = i; |
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} |
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/* mask and clear all interrupt vectors */ |
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writel(0x0, ACK_INT_MSK_REG(mbox->ipc)); |
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writel(~0x0, ACK_INT_CLR_REG(mbox->ipc)); |
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/* use interrupt for tx's ack */ |
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if (of_find_property(node, "hi6220,mbox-tx-noirq", NULL)) |
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mbox->tx_irq_mode = false; |
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else |
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mbox->tx_irq_mode = true; |
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if (mbox->tx_irq_mode) |
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mbox->controller.txdone_irq = true; |
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else { |
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mbox->controller.txdone_poll = true; |
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mbox->controller.txpoll_period = 5; |
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} |
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err = devm_mbox_controller_register(dev, &mbox->controller); |
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if (err) { |
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dev_err(dev, "Failed to register mailbox %d\n", err); |
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return err; |
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} |
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platform_set_drvdata(pdev, mbox); |
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dev_info(dev, "Mailbox enabled\n"); |
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return 0; |
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} |
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static struct platform_driver hi6220_mbox_driver = { |
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.driver = { |
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.name = "hi6220-mbox", |
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.of_match_table = hi6220_mbox_of_match, |
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}, |
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.probe = hi6220_mbox_probe, |
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}; |
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static int __init hi6220_mbox_init(void) |
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{ |
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return platform_driver_register(&hi6220_mbox_driver); |
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} |
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core_initcall(hi6220_mbox_init); |
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static void __exit hi6220_mbox_exit(void) |
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{ |
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platform_driver_unregister(&hi6220_mbox_driver); |
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} |
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module_exit(hi6220_mbox_exit); |
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MODULE_AUTHOR("Leo Yan <[email protected]>"); |
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MODULE_DESCRIPTION("Hi6220 mailbox driver"); |
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MODULE_LICENSE("GPL v2");
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