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158 lines
3.9 KiB
158 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Texas Instruments' K3 Interrupt Aggregator MSI bus |
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* |
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* Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/ |
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* Lokesh Vutla <[email protected]> |
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*/ |
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#include <linux/irq.h> |
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#include <linux/irqdomain.h> |
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#include <linux/msi.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/of_irq.h> |
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#include <linux/soc/ti/ti_sci_inta_msi.h> |
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#include <linux/soc/ti/ti_sci_protocol.h> |
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static void ti_sci_inta_msi_write_msg(struct irq_data *data, |
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struct msi_msg *msg) |
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{ |
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/* Nothing to do */ |
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} |
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static void ti_sci_inta_msi_compose_msi_msg(struct irq_data *data, |
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struct msi_msg *msg) |
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{ |
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/* Nothing to do */ |
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} |
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static void ti_sci_inta_msi_update_chip_ops(struct msi_domain_info *info) |
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{ |
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struct irq_chip *chip = info->chip; |
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if (WARN_ON(!chip)) |
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return; |
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chip->irq_request_resources = irq_chip_request_resources_parent; |
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chip->irq_release_resources = irq_chip_release_resources_parent; |
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chip->irq_compose_msi_msg = ti_sci_inta_msi_compose_msi_msg; |
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chip->irq_write_msi_msg = ti_sci_inta_msi_write_msg; |
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chip->irq_set_type = irq_chip_set_type_parent; |
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chip->irq_unmask = irq_chip_unmask_parent; |
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chip->irq_mask = irq_chip_mask_parent; |
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chip->irq_ack = irq_chip_ack_parent; |
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} |
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struct irq_domain *ti_sci_inta_msi_create_irq_domain(struct fwnode_handle *fwnode, |
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struct msi_domain_info *info, |
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struct irq_domain *parent) |
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{ |
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struct irq_domain *domain; |
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ti_sci_inta_msi_update_chip_ops(info); |
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domain = msi_create_irq_domain(fwnode, info, parent); |
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if (domain) |
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irq_domain_update_bus_token(domain, DOMAIN_BUS_TI_SCI_INTA_MSI); |
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return domain; |
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} |
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EXPORT_SYMBOL_GPL(ti_sci_inta_msi_create_irq_domain); |
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static void ti_sci_inta_msi_free_descs(struct device *dev) |
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{ |
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struct msi_desc *desc, *tmp; |
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list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) { |
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list_del(&desc->list); |
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free_msi_entry(desc); |
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} |
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} |
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static int ti_sci_inta_msi_alloc_descs(struct device *dev, |
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struct ti_sci_resource *res) |
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{ |
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struct msi_desc *msi_desc; |
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int set, i, count = 0; |
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for (set = 0; set < res->sets; set++) { |
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for (i = 0; i < res->desc[set].num; i++) { |
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msi_desc = alloc_msi_entry(dev, 1, NULL); |
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if (!msi_desc) { |
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ti_sci_inta_msi_free_descs(dev); |
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return -ENOMEM; |
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} |
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msi_desc->inta.dev_index = res->desc[set].start + i; |
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INIT_LIST_HEAD(&msi_desc->list); |
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list_add_tail(&msi_desc->list, dev_to_msi_list(dev)); |
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count++; |
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} |
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for (i = 0; i < res->desc[set].num_sec; i++) { |
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msi_desc = alloc_msi_entry(dev, 1, NULL); |
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if (!msi_desc) { |
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ti_sci_inta_msi_free_descs(dev); |
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return -ENOMEM; |
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} |
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msi_desc->inta.dev_index = res->desc[set].start_sec + i; |
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INIT_LIST_HEAD(&msi_desc->list); |
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list_add_tail(&msi_desc->list, dev_to_msi_list(dev)); |
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count++; |
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} |
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} |
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return count; |
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} |
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int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev, |
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struct ti_sci_resource *res) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct irq_domain *msi_domain; |
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int ret, nvec; |
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msi_domain = dev_get_msi_domain(dev); |
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if (!msi_domain) |
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return -EINVAL; |
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if (pdev->id < 0) |
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return -ENODEV; |
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nvec = ti_sci_inta_msi_alloc_descs(dev, res); |
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if (nvec <= 0) |
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return nvec; |
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ret = msi_domain_alloc_irqs(msi_domain, dev, nvec); |
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if (ret) { |
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dev_err(dev, "Failed to allocate IRQs %d\n", ret); |
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goto cleanup; |
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} |
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return 0; |
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cleanup: |
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ti_sci_inta_msi_free_descs(&pdev->dev); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs); |
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void ti_sci_inta_msi_domain_free_irqs(struct device *dev) |
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{ |
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msi_domain_free_irqs(dev->msi_domain, dev); |
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ti_sci_inta_msi_free_descs(dev); |
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} |
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EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_free_irqs); |
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unsigned int ti_sci_inta_msi_get_virq(struct device *dev, u32 dev_index) |
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{ |
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struct msi_desc *desc; |
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for_each_msi_entry(desc, dev) |
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if (desc->inta.dev_index == dev_index) |
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return desc->irq; |
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return -ENODEV; |
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} |
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EXPORT_SYMBOL_GPL(ti_sci_inta_msi_get_virq);
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