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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel@pengutronix.de>
- */
- #include <linux/clk.h>
- #include <linux/firmware/imx/ipc.h>
- #include <linux/interrupt.h>
- #include <linux/io.h>
- #include <linux/iopoll.h>
- #include <linux/kernel.h>
- #include <linux/mailbox_controller.h>
- #include <linux/module.h>
- #include <linux/of_device.h>
- #include <linux/pm_runtime.h>
- #include <linux/suspend.h>
- #include <linux/slab.h>
- #define IMX_MU_xSR_GIPn(x) BIT(28 + (3 - (x)))
- #define IMX_MU_xSR_RFn(x) BIT(24 + (3 - (x)))
- #define IMX_MU_xSR_TEn(x) BIT(20 + (3 - (x)))
- #define IMX_MU_xSR_BRDIP BIT(9)
- /* General Purpose Interrupt Enable */
- #define IMX_MU_xCR_GIEn(x) BIT(28 + (3 - (x)))
- /* Receive Interrupt Enable */
- #define IMX_MU_xCR_RIEn(x) BIT(24 + (3 - (x)))
- /* Transmit Interrupt Enable */
- #define IMX_MU_xCR_TIEn(x) BIT(20 + (3 - (x)))
- /* General Purpose Interrupt Request */
- #define IMX_MU_xCR_GIRn(x) BIT(16 + (3 - (x)))
- #define IMX_MU_CHANS 16
- /* TX0/RX0/RXDB[0-3] */
- #define IMX_MU_SCU_CHANS 6
- #define IMX_MU_CHAN_NAME_SIZE 20
- enum imx_mu_chan_type {
- IMX_MU_TYPE_TX, /* Tx */
- IMX_MU_TYPE_RX, /* Rx */
- IMX_MU_TYPE_TXDB, /* Tx doorbell */
- IMX_MU_TYPE_RXDB, /* Rx doorbell */
- };
- struct imx_sc_rpc_msg_max {
- struct imx_sc_rpc_msg hdr;
- u32 data[7];
- };
- struct imx_mu_con_priv {
- unsigned int idx;
- char irq_desc[IMX_MU_CHAN_NAME_SIZE];
- enum imx_mu_chan_type type;
- struct mbox_chan *chan;
- struct tasklet_struct txdb_tasklet;
- };
- struct imx_mu_priv {
- struct device *dev;
- void __iomem *base;
- spinlock_t xcr_lock; /* control register lock */
- struct mbox_controller mbox;
- struct mbox_chan mbox_chans[IMX_MU_CHANS];
- struct imx_mu_con_priv con_priv[IMX_MU_CHANS];
- const struct imx_mu_dcfg *dcfg;
- struct clk *clk;
- int irq;
- bool suspend;
- u32 xcr;
- bool side_b;
- };
- struct imx_mu_dcfg {
- int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data);
- int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
- void (*init)(struct imx_mu_priv *priv);
- u32 xTR[4]; /* Transmit Registers */
- u32 xRR[4]; /* Receive Registers */
- u32 xSR; /* Status Register */
- u32 xCR; /* Control Register */
- };
- static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
- {
- return container_of(mbox, struct imx_mu_priv, mbox);
- }
- static void imx_mu_write(struct imx_mu_priv *priv, u32 val, u32 offs)
- {
- iowrite32(val, priv->base + offs);
- }
- static u32 imx_mu_read(struct imx_mu_priv *priv, u32 offs)
- {
- return ioread32(priv->base + offs);
- }
- static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, u32 set, u32 clr)
- {
- unsigned long flags;
- u32 val;
- spin_lock_irqsave(&priv->xcr_lock, flags);
- val = imx_mu_read(priv, priv->dcfg->xCR);
- val &= ~clr;
- val |= set;
- imx_mu_write(priv, val, priv->dcfg->xCR);
- spin_unlock_irqrestore(&priv->xcr_lock, flags);
- return val;
- }
- static int imx_mu_generic_tx(struct imx_mu_priv *priv,
- struct imx_mu_con_priv *cp,
- void *data)
- {
- u32 *arg = data;
- switch (cp->type) {
- case IMX_MU_TYPE_TX:
- imx_mu_write(priv, *arg, priv->dcfg->xTR[cp->idx]);
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
- break;
- case IMX_MU_TYPE_TXDB:
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIRn(cp->idx), 0);
- tasklet_schedule(&cp->txdb_tasklet);
- break;
- default:
- dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
- return -EINVAL;
- }
- return 0;
- }
- static int imx_mu_generic_rx(struct imx_mu_priv *priv,
- struct imx_mu_con_priv *cp)
- {
- u32 dat;
- dat = imx_mu_read(priv, priv->dcfg->xRR[cp->idx]);
- mbox_chan_received_data(cp->chan, (void *)&dat);
- return 0;
- }
- static int imx_mu_scu_tx(struct imx_mu_priv *priv,
- struct imx_mu_con_priv *cp,
- void *data)
- {
- struct imx_sc_rpc_msg_max *msg = data;
- u32 *arg = data;
- int i, ret;
- u32 xsr;
- switch (cp->type) {
- case IMX_MU_TYPE_TX:
- /*
- * msg->hdr.size specifies the number of u32 words while
- * sizeof yields bytes.
- */
- if (msg->hdr.size > sizeof(*msg) / 4) {
- /*
- * The real message size can be different to
- * struct imx_sc_rpc_msg_max size
- */
- dev_err(priv->dev, "Maximal message size (%zu bytes) exceeded on TX; got: %i bytes\n", sizeof(*msg), msg->hdr.size << 2);
- return -EINVAL;
- }
- for (i = 0; i < 4 && i < msg->hdr.size; i++)
- imx_mu_write(priv, *arg++, priv->dcfg->xTR[i % 4]);
- for (; i < msg->hdr.size; i++) {
- ret = readl_poll_timeout(priv->base + priv->dcfg->xSR,
- xsr,
- xsr & IMX_MU_xSR_TEn(i % 4),
- 0, 100);
- if (ret) {
- dev_err(priv->dev, "Send data index: %d timeout\n", i);
- return ret;
- }
- imx_mu_write(priv, *arg++, priv->dcfg->xTR[i % 4]);
- }
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
- break;
- default:
- dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
- return -EINVAL;
- }
- return 0;
- }
- static int imx_mu_scu_rx(struct imx_mu_priv *priv,
- struct imx_mu_con_priv *cp)
- {
- struct imx_sc_rpc_msg_max msg;
- u32 *data = (u32 *)&msg;
- int i, ret;
- u32 xsr;
- imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(0));
- *data++ = imx_mu_read(priv, priv->dcfg->xRR[0]);
- if (msg.hdr.size > sizeof(msg) / 4) {
- dev_err(priv->dev, "Maximal message size (%zu bytes) exceeded on RX; got: %i bytes\n", sizeof(msg), msg.hdr.size << 2);
- return -EINVAL;
- }
- for (i = 1; i < msg.hdr.size; i++) {
- ret = readl_poll_timeout(priv->base + priv->dcfg->xSR, xsr,
- xsr & IMX_MU_xSR_RFn(i % 4), 0, 100);
- if (ret) {
- dev_err(priv->dev, "timeout read idx %d\n", i);
- return ret;
- }
- *data++ = imx_mu_read(priv, priv->dcfg->xRR[i % 4]);
- }
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_RIEn(0), 0);
- mbox_chan_received_data(cp->chan, (void *)&msg);
- return 0;
- }
- static void imx_mu_txdb_tasklet(unsigned long data)
- {
- struct imx_mu_con_priv *cp = (struct imx_mu_con_priv *)data;
- mbox_chan_txdone(cp->chan, 0);
- }
- static irqreturn_t imx_mu_isr(int irq, void *p)
- {
- struct mbox_chan *chan = p;
- struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
- struct imx_mu_con_priv *cp = chan->con_priv;
- u32 val, ctrl;
- ctrl = imx_mu_read(priv, priv->dcfg->xCR);
- val = imx_mu_read(priv, priv->dcfg->xSR);
- switch (cp->type) {
- case IMX_MU_TYPE_TX:
- val &= IMX_MU_xSR_TEn(cp->idx) &
- (ctrl & IMX_MU_xCR_TIEn(cp->idx));
- break;
- case IMX_MU_TYPE_RX:
- val &= IMX_MU_xSR_RFn(cp->idx) &
- (ctrl & IMX_MU_xCR_RIEn(cp->idx));
- break;
- case IMX_MU_TYPE_RXDB:
- val &= IMX_MU_xSR_GIPn(cp->idx) &
- (ctrl & IMX_MU_xCR_GIEn(cp->idx));
- break;
- default:
- break;
- }
- if (!val)
- return IRQ_NONE;
- if (val == IMX_MU_xSR_TEn(cp->idx)) {
- imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
- mbox_chan_txdone(chan, 0);
- } else if (val == IMX_MU_xSR_RFn(cp->idx)) {
- priv->dcfg->rx(priv, cp);
- } else if (val == IMX_MU_xSR_GIPn(cp->idx)) {
- imx_mu_write(priv, IMX_MU_xSR_GIPn(cp->idx), priv->dcfg->xSR);
- mbox_chan_received_data(chan, NULL);
- } else {
- dev_warn_ratelimited(priv->dev, "Not handled interrupt\n");
- return IRQ_NONE;
- }
- if (priv->suspend)
- pm_system_wakeup();
- return IRQ_HANDLED;
- }
- static int imx_mu_send_data(struct mbox_chan *chan, void *data)
- {
- struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
- struct imx_mu_con_priv *cp = chan->con_priv;
- return priv->dcfg->tx(priv, cp, data);
- }
- static int imx_mu_startup(struct mbox_chan *chan)
- {
- struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
- struct imx_mu_con_priv *cp = chan->con_priv;
- unsigned long irq_flag = IRQF_SHARED;
- int ret;
- pm_runtime_get_sync(priv->dev);
- if (cp->type == IMX_MU_TYPE_TXDB) {
- /* Tx doorbell don't have ACK support */
- tasklet_init(&cp->txdb_tasklet, imx_mu_txdb_tasklet,
- (unsigned long)cp);
- return 0;
- }
- /* IPC MU should be with IRQF_NO_SUSPEND set */
- if (!priv->dev->pm_domain)
- irq_flag |= IRQF_NO_SUSPEND;
- ret = request_irq(priv->irq, imx_mu_isr, irq_flag,
- cp->irq_desc, chan);
- if (ret) {
- dev_err(priv->dev,
- "Unable to acquire IRQ %d\n", priv->irq);
- return ret;
- }
- switch (cp->type) {
- case IMX_MU_TYPE_RX:
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_RIEn(cp->idx), 0);
- break;
- case IMX_MU_TYPE_RXDB:
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIEn(cp->idx), 0);
- break;
- default:
- break;
- }
- priv->suspend = true;
- return 0;
- }
- static void imx_mu_shutdown(struct mbox_chan *chan)
- {
- struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
- struct imx_mu_con_priv *cp = chan->con_priv;
- if (cp->type == IMX_MU_TYPE_TXDB) {
- tasklet_kill(&cp->txdb_tasklet);
- pm_runtime_put_sync(priv->dev);
- return;
- }
- switch (cp->type) {
- case IMX_MU_TYPE_TX:
- imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
- break;
- case IMX_MU_TYPE_RX:
- imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(cp->idx));
- break;
- case IMX_MU_TYPE_RXDB:
- imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_GIEn(cp->idx));
- break;
- default:
- break;
- }
- free_irq(priv->irq, chan);
- pm_runtime_put_sync(priv->dev);
- }
- static const struct mbox_chan_ops imx_mu_ops = {
- .send_data = imx_mu_send_data,
- .startup = imx_mu_startup,
- .shutdown = imx_mu_shutdown,
- };
- static struct mbox_chan *imx_mu_scu_xlate(struct mbox_controller *mbox,
- const struct of_phandle_args *sp)
- {
- u32 type, idx, chan;
- if (sp->args_count != 2) {
- dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
- return ERR_PTR(-EINVAL);
- }
- type = sp->args[0]; /* channel type */
- idx = sp->args[1]; /* index */
- switch (type) {
- case IMX_MU_TYPE_TX:
- case IMX_MU_TYPE_RX:
- if (idx != 0)
- dev_err(mbox->dev, "Invalid chan idx: %d\n", idx);
- chan = type;
- break;
- case IMX_MU_TYPE_RXDB:
- chan = 2 + idx;
- break;
- default:
- dev_err(mbox->dev, "Invalid chan type: %d\n", type);
- return ERR_PTR(-EINVAL);
- }
- if (chan >= mbox->num_chans) {
- dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
- return ERR_PTR(-EINVAL);
- }
- return &mbox->chans[chan];
- }
- static struct mbox_chan * imx_mu_xlate(struct mbox_controller *mbox,
- const struct of_phandle_args *sp)
- {
- u32 type, idx, chan;
- if (sp->args_count != 2) {
- dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
- return ERR_PTR(-EINVAL);
- }
- type = sp->args[0]; /* channel type */
- idx = sp->args[1]; /* index */
- chan = type * 4 + idx;
- if (chan >= mbox->num_chans) {
- dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
- return ERR_PTR(-EINVAL);
- }
- return &mbox->chans[chan];
- }
- static void imx_mu_init_generic(struct imx_mu_priv *priv)
- {
- unsigned int i;
- for (i = 0; i < IMX_MU_CHANS; i++) {
- struct imx_mu_con_priv *cp = &priv->con_priv[i];
- cp->idx = i % 4;
- cp->type = i >> 2;
- cp->chan = &priv->mbox_chans[i];
- priv->mbox_chans[i].con_priv = cp;
- snprintf(cp->irq_desc, sizeof(cp->irq_desc),
- "imx_mu_chan[%i-%i]", cp->type, cp->idx);
- }
- priv->mbox.num_chans = IMX_MU_CHANS;
- priv->mbox.of_xlate = imx_mu_xlate;
- if (priv->side_b)
- return;
- /* Set default MU configuration */
- imx_mu_write(priv, 0, priv->dcfg->xCR);
- }
- static void imx_mu_init_scu(struct imx_mu_priv *priv)
- {
- unsigned int i;
- for (i = 0; i < IMX_MU_SCU_CHANS; i++) {
- struct imx_mu_con_priv *cp = &priv->con_priv[i];
- cp->idx = i < 2 ? 0 : i - 2;
- cp->type = i < 2 ? i : IMX_MU_TYPE_RXDB;
- cp->chan = &priv->mbox_chans[i];
- priv->mbox_chans[i].con_priv = cp;
- snprintf(cp->irq_desc, sizeof(cp->irq_desc),
- "imx_mu_chan[%i-%i]", cp->type, cp->idx);
- }
- priv->mbox.num_chans = IMX_MU_SCU_CHANS;
- priv->mbox.of_xlate = imx_mu_scu_xlate;
- /* Set default MU configuration */
- imx_mu_write(priv, 0, priv->dcfg->xCR);
- }
- static int imx_mu_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
- struct imx_mu_priv *priv;
- const struct imx_mu_dcfg *dcfg;
- int ret;
- priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
- priv->dev = dev;
- priv->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(priv->base))
- return PTR_ERR(priv->base);
- priv->irq = platform_get_irq(pdev, 0);
- if (priv->irq < 0)
- return priv->irq;
- dcfg = of_device_get_match_data(dev);
- if (!dcfg)
- return -EINVAL;
- priv->dcfg = dcfg;
- priv->clk = devm_clk_get(dev, NULL);
- if (IS_ERR(priv->clk)) {
- if (PTR_ERR(priv->clk) != -ENOENT)
- return PTR_ERR(priv->clk);
- priv->clk = NULL;
- }
- ret = clk_prepare_enable(priv->clk);
- if (ret) {
- dev_err(dev, "Failed to enable clock\n");
- return ret;
- }
- priv->side_b = of_property_read_bool(np, "fsl,mu-side-b");
- priv->dcfg->init(priv);
- spin_lock_init(&priv->xcr_lock);
- priv->mbox.dev = dev;
- priv->mbox.ops = &imx_mu_ops;
- priv->mbox.chans = priv->mbox_chans;
- priv->mbox.txdone_irq = true;
- platform_set_drvdata(pdev, priv);
- ret = devm_mbox_controller_register(dev, &priv->mbox);
- if (ret) {
- clk_disable_unprepare(priv->clk);
- return ret;
- }
- pm_runtime_enable(dev);
- ret = pm_runtime_get_sync(dev);
- if (ret < 0) {
- pm_runtime_put_noidle(dev);
- goto disable_runtime_pm;
- }
- ret = pm_runtime_put_sync(dev);
- if (ret < 0)
- goto disable_runtime_pm;
- clk_disable_unprepare(priv->clk);
- priv->suspend = false;
- return 0;
- disable_runtime_pm:
- pm_runtime_disable(dev);
- clk_disable_unprepare(priv->clk);
- return ret;
- }
- static int imx_mu_remove(struct platform_device *pdev)
- {
- struct imx_mu_priv *priv = platform_get_drvdata(pdev);
- pm_runtime_disable(priv->dev);
- return 0;
- }
- static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
- .tx = imx_mu_generic_tx,
- .rx = imx_mu_generic_rx,
- .init = imx_mu_init_generic,
- .xTR = {0x0, 0x4, 0x8, 0xc},
- .xRR = {0x10, 0x14, 0x18, 0x1c},
- .xSR = 0x20,
- .xCR = 0x24,
- };
- static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
- .tx = imx_mu_generic_tx,
- .rx = imx_mu_generic_rx,
- .init = imx_mu_init_generic,
- .xTR = {0x20, 0x24, 0x28, 0x2c},
- .xRR = {0x40, 0x44, 0x48, 0x4c},
- .xSR = 0x60,
- .xCR = 0x64,
- };
- static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
- .tx = imx_mu_scu_tx,
- .rx = imx_mu_scu_rx,
- .init = imx_mu_init_scu,
- .xTR = {0x0, 0x4, 0x8, 0xc},
- .xRR = {0x10, 0x14, 0x18, 0x1c},
- .xSR = 0x20,
- .xCR = 0x24,
- };
- static const struct of_device_id imx_mu_dt_ids[] = {
- { .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
- { .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
- { .compatible = "fsl,imx8-mu-scu", .data = &imx_mu_cfg_imx8_scu },
- { },
- };
- MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
- static int __maybe_unused imx_mu_suspend_noirq(struct device *dev)
- {
- struct imx_mu_priv *priv = dev_get_drvdata(dev);
- if (!priv->clk)
- priv->xcr = imx_mu_read(priv, priv->dcfg->xCR);
- return 0;
- }
- static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
- {
- struct imx_mu_priv *priv = dev_get_drvdata(dev);
- /*
- * ONLY restore MU when context lost, the TIE could
- * be set during noirq resume as there is MU data
- * communication going on, and restore the saved
- * value will overwrite the TIE and cause MU data
- * send failed, may lead to system freeze. This issue
- * is observed by testing freeze mode suspend.
- */
- if (!imx_mu_read(priv, priv->dcfg->xCR) && !priv->clk)
- imx_mu_write(priv, priv->xcr, priv->dcfg->xCR);
- return 0;
- }
- static int __maybe_unused imx_mu_runtime_suspend(struct device *dev)
- {
- struct imx_mu_priv *priv = dev_get_drvdata(dev);
- clk_disable_unprepare(priv->clk);
- return 0;
- }
- static int __maybe_unused imx_mu_runtime_resume(struct device *dev)
- {
- struct imx_mu_priv *priv = dev_get_drvdata(dev);
- int ret;
- ret = clk_prepare_enable(priv->clk);
- if (ret)
- dev_err(dev, "failed to enable clock\n");
- return ret;
- }
- static const struct dev_pm_ops imx_mu_pm_ops = {
- SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_mu_suspend_noirq,
- imx_mu_resume_noirq)
- SET_RUNTIME_PM_OPS(imx_mu_runtime_suspend,
- imx_mu_runtime_resume, NULL)
- };
- static struct platform_driver imx_mu_driver = {
- .probe = imx_mu_probe,
- .remove = imx_mu_remove,
- .driver = {
- .name = "imx_mu",
- .of_match_table = imx_mu_dt_ids,
- .pm = &imx_mu_pm_ops,
- },
- };
- module_platform_driver(imx_mu_driver);
- MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>");
- MODULE_DESCRIPTION("Message Unit driver for i.MX");
- MODULE_LICENSE("GPL v2");
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