// 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 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, }; 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");