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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
- */
- #include <linux/bitfield.h>
- #include <linux/interrupt.h>
- #include <linux/irq.h>
- #include <linux/irqdomain.h>
- #include <linux/mailbox_controller.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <dt-bindings/mailbox/qcom-ipcc.h>
- #define IPCC_MBOX_MAX_CHAN 48
- /* IPCC Register offsets */
- #define IPCC_REG_SEND_ID 0x0c
- #define IPCC_REG_RECV_ID 0x10
- #define IPCC_REG_RECV_SIGNAL_ENABLE 0x14
- #define IPCC_REG_RECV_SIGNAL_DISABLE 0x18
- #define IPCC_REG_RECV_SIGNAL_CLEAR 0x1c
- #define IPCC_REG_CLIENT_CLEAR 0x38
- #define IPCC_SIGNAL_ID_MASK GENMASK(15, 0)
- #define IPCC_CLIENT_ID_MASK GENMASK(31, 16)
- #define IPCC_NO_PENDING_IRQ GENMASK(31, 0)
- /**
- * struct qcom_ipcc_chan_info - Per-mailbox-channel info
- * @client_id: The client-id to which the interrupt has to be triggered
- * @signal_id: The signal-id to which the interrupt has to be triggered
- */
- struct qcom_ipcc_chan_info {
- u16 client_id;
- u16 signal_id;
- };
- /**
- * struct qcom_ipcc - Holder for the mailbox driver
- * @dev: Device associated with this instance
- * @base: Base address of the IPCC frame associated to APSS
- * @irq_domain: The irq_domain associated with this instance
- * @chan: The mailbox channels array
- * @mchan: The per-mailbox channel info array
- * @mbox: The mailbox controller
- * @irq: Summary irq
- */
- struct qcom_ipcc {
- struct device *dev;
- void __iomem *base;
- struct irq_domain *irq_domain;
- struct mbox_chan chan[IPCC_MBOX_MAX_CHAN];
- struct qcom_ipcc_chan_info mchan[IPCC_MBOX_MAX_CHAN];
- struct mbox_controller mbox;
- int irq;
- };
- static inline struct qcom_ipcc *to_qcom_ipcc(struct mbox_controller *mbox)
- {
- return container_of(mbox, struct qcom_ipcc, mbox);
- }
- static inline u32 qcom_ipcc_get_hwirq(u16 client_id, u16 signal_id)
- {
- return FIELD_PREP(IPCC_CLIENT_ID_MASK, client_id) |
- FIELD_PREP(IPCC_SIGNAL_ID_MASK, signal_id);
- }
- static irqreturn_t qcom_ipcc_irq_fn(int irq, void *data)
- {
- struct qcom_ipcc *ipcc = data;
- u32 hwirq;
- int virq;
- for (;;) {
- hwirq = readl(ipcc->base + IPCC_REG_RECV_ID);
- if (hwirq == IPCC_NO_PENDING_IRQ)
- break;
- virq = irq_find_mapping(ipcc->irq_domain, hwirq);
- writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_CLEAR);
- generic_handle_irq(virq);
- }
- return IRQ_HANDLED;
- }
- static void qcom_ipcc_mask_irq(struct irq_data *irqd)
- {
- struct qcom_ipcc *ipcc = irq_data_get_irq_chip_data(irqd);
- irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
- writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_DISABLE);
- }
- static void qcom_ipcc_unmask_irq(struct irq_data *irqd)
- {
- struct qcom_ipcc *ipcc = irq_data_get_irq_chip_data(irqd);
- irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
- writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_ENABLE);
- }
- static struct irq_chip qcom_ipcc_irq_chip = {
- .name = "ipcc",
- .irq_mask = qcom_ipcc_mask_irq,
- .irq_unmask = qcom_ipcc_unmask_irq,
- .flags = IRQCHIP_SKIP_SET_WAKE,
- };
- static int qcom_ipcc_domain_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hw)
- {
- struct qcom_ipcc *ipcc = d->host_data;
- irq_set_chip_and_handler(irq, &qcom_ipcc_irq_chip, handle_level_irq);
- irq_set_chip_data(irq, ipcc);
- irq_set_noprobe(irq);
- return 0;
- }
- static int qcom_ipcc_domain_xlate(struct irq_domain *d,
- struct device_node *node, const u32 *intspec,
- unsigned int intsize,
- unsigned long *out_hwirq,
- unsigned int *out_type)
- {
- if (intsize != 3)
- return -EINVAL;
- *out_hwirq = qcom_ipcc_get_hwirq(intspec[0], intspec[1]);
- *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
- return 0;
- }
- static const struct irq_domain_ops qcom_ipcc_irq_ops = {
- .map = qcom_ipcc_domain_map,
- .xlate = qcom_ipcc_domain_xlate,
- };
- static int qcom_ipcc_mbox_send_data(struct mbox_chan *chan, void *data)
- {
- struct qcom_ipcc *ipcc = to_qcom_ipcc(chan->mbox);
- struct qcom_ipcc_chan_info *mchan = chan->con_priv;
- u32 hwirq;
- hwirq = qcom_ipcc_get_hwirq(mchan->client_id, mchan->signal_id);
- writel(hwirq, ipcc->base + IPCC_REG_SEND_ID);
- return 0;
- }
- static void qcom_ipcc_mbox_shutdown(struct mbox_chan *chan)
- {
- chan->con_priv = NULL;
- }
- static struct mbox_chan *qcom_ipcc_mbox_xlate(struct mbox_controller *mbox,
- const struct of_phandle_args *ph)
- {
- struct qcom_ipcc *ipcc = to_qcom_ipcc(mbox);
- struct qcom_ipcc_chan_info *mchan;
- struct mbox_chan *chan;
- unsigned int i;
- if (ph->args_count != 2)
- return ERR_PTR(-EINVAL);
- for (i = 0; i < IPCC_MBOX_MAX_CHAN; i++) {
- chan = &ipcc->chan[i];
- if (!chan->con_priv) {
- mchan = &ipcc->mchan[i];
- mchan->client_id = ph->args[0];
- mchan->signal_id = ph->args[1];
- chan->con_priv = mchan;
- break;
- }
- chan = NULL;
- }
- return chan ?: ERR_PTR(-EBUSY);
- }
- static const struct mbox_chan_ops ipcc_mbox_chan_ops = {
- .send_data = qcom_ipcc_mbox_send_data,
- .shutdown = qcom_ipcc_mbox_shutdown,
- };
- static int qcom_ipcc_setup_mbox(struct qcom_ipcc *ipcc)
- {
- struct mbox_controller *mbox;
- struct device *dev = ipcc->dev;
- mbox = &ipcc->mbox;
- mbox->dev = dev;
- mbox->num_chans = IPCC_MBOX_MAX_CHAN;
- mbox->chans = ipcc->chan;
- mbox->ops = &ipcc_mbox_chan_ops;
- mbox->of_xlate = qcom_ipcc_mbox_xlate;
- mbox->txdone_irq = false;
- mbox->txdone_poll = false;
- return devm_mbox_controller_register(dev, mbox);
- }
- static int qcom_ipcc_probe(struct platform_device *pdev)
- {
- struct qcom_ipcc *ipcc;
- int ret;
- ipcc = devm_kzalloc(&pdev->dev, sizeof(*ipcc), GFP_KERNEL);
- if (!ipcc)
- return -ENOMEM;
- ipcc->dev = &pdev->dev;
- ipcc->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(ipcc->base))
- return PTR_ERR(ipcc->base);
- ipcc->irq = platform_get_irq(pdev, 0);
- if (ipcc->irq < 0)
- return ipcc->irq;
- ipcc->irq_domain = irq_domain_add_tree(pdev->dev.of_node,
- &qcom_ipcc_irq_ops, ipcc);
- if (!ipcc->irq_domain)
- return -ENOMEM;
- ret = qcom_ipcc_setup_mbox(ipcc);
- if (ret)
- goto err_mbox;
- ret = devm_request_irq(&pdev->dev, ipcc->irq, qcom_ipcc_irq_fn,
- IRQF_TRIGGER_HIGH, "ipcc", ipcc);
- if (ret < 0) {
- dev_err(&pdev->dev, "Failed to register the irq: %d\n", ret);
- goto err_mbox;
- }
- enable_irq_wake(ipcc->irq);
- platform_set_drvdata(pdev, ipcc);
- return 0;
- err_mbox:
- irq_domain_remove(ipcc->irq_domain);
- return ret;
- }
- static int qcom_ipcc_remove(struct platform_device *pdev)
- {
- struct qcom_ipcc *ipcc = platform_get_drvdata(pdev);
- disable_irq_wake(ipcc->irq);
- irq_domain_remove(ipcc->irq_domain);
- return 0;
- }
- static const struct of_device_id qcom_ipcc_of_match[] = {
- { .compatible = "qcom,ipcc"},
- {}
- };
- MODULE_DEVICE_TABLE(of, qcom_ipcc_of_match);
- static struct platform_driver qcom_ipcc_driver = {
- .probe = qcom_ipcc_probe,
- .remove = qcom_ipcc_remove,
- .driver = {
- .name = "qcom-ipcc",
- .of_match_table = qcom_ipcc_of_match,
- },
- };
- static int __init qcom_ipcc_init(void)
- {
- return platform_driver_register(&qcom_ipcc_driver);
- }
- arch_initcall(qcom_ipcc_init);
- MODULE_AUTHOR("Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>");
- MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
- MODULE_DESCRIPTION("Qualcomm Technologies, Inc. IPCC driver");
- MODULE_LICENSE("GPL v2");
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