drivers/soc/ti/ti_sci_inta_msi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Texas Instruments' K3 Interrupt Aggregator MSI bus
   4  *
   5  * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
   6  *      Lokesh Vutla <lokeshvutla@ti.com>
   7  */
   8
   9 #include <linux/irq.h>
  10 #include <linux/irqdomain.h>
  11 #include <linux/msi.h>
  12 #include <linux/of_address.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/soc/ti/ti_sci_inta_msi.h>
  16 #include <linux/soc/ti/ti_sci_protocol.h>
  17
  18 static void ti_sci_inta_msi_write_msg(struct irq_data *data,
  19                                       struct msi_msg *msg)
  20 {
  21         /* Nothing to do */
  22 }
  23
  24 static void ti_sci_inta_msi_compose_msi_msg(struct irq_data *data,
  25                                             struct msi_msg *msg)
  26 {
  27         /* Nothing to do */
  28 }
  29
  30 static void ti_sci_inta_msi_update_chip_ops(struct msi_domain_info *info)
  31 {
  32         struct irq_chip *chip = info->chip;
  33
  34         if (WARN_ON(!chip))
  35                 return;
  36
  37         chip->irq_request_resources = irq_chip_request_resources_parent;
  38         chip->irq_release_resources = irq_chip_release_resources_parent;
  39         chip->irq_compose_msi_msg = ti_sci_inta_msi_compose_msi_msg;
  40         chip->irq_write_msi_msg = ti_sci_inta_msi_write_msg;
  41         chip->irq_set_type = irq_chip_set_type_parent;
  42         chip->irq_unmask = irq_chip_unmask_parent;
  43         chip->irq_mask = irq_chip_mask_parent;
  44         chip->irq_ack = irq_chip_ack_parent;
  45 }
  46
  47 struct irq_domain *ti_sci_inta_msi_create_irq_domain(struct fwnode_handle *fwnode,
  48                                                      struct msi_domain_info *info,
  49                                                      struct irq_domain *parent)
  50 {
  51         struct irq_domain *domain;
  52
  53         ti_sci_inta_msi_update_chip_ops(info);
  54
  55         domain = msi_create_irq_domain(fwnode, info, parent);
  56         if (domain)
  57                 irq_domain_update_bus_token(domain, DOMAIN_BUS_TI_SCI_INTA_MSI);
  58
  59         return domain;
  60 }
  61 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_create_irq_domain);
  62
  63 static void ti_sci_inta_msi_free_descs(struct device *dev)
  64 {
  65         struct msi_desc *desc, *tmp;
  66
  67         list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
  68                 list_del(&desc->list);
  69                 free_msi_entry(desc);
  70         }
  71 }
  72
  73 static int ti_sci_inta_msi_alloc_descs(struct device *dev,
  74                                        struct ti_sci_resource *res)
  75 {
  76         struct msi_desc *msi_desc;
  77         int set, i, count = 0;
  78
  79         for (set = 0; set < res->sets; set++) {
  80                 for (i = 0; i < res->desc[set].num; i++) {
  81                         msi_desc = alloc_msi_entry(dev, 1, NULL);
  82                         if (!msi_desc) {
  83                                 ti_sci_inta_msi_free_descs(dev);
  84                                 return -ENOMEM;
  85                         }
  86
  87                         msi_desc->inta.dev_index = res->desc[set].start + i;
  88                         INIT_LIST_HEAD(&msi_desc->list);
  89                         list_add_tail(&msi_desc->list, dev_to_msi_list(dev));
  90                         count++;
  91                 }
  92         }
  93
  94         return count;
  95 }
  96
  97 int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev,
  98                                       struct ti_sci_resource *res)
  99 {
 100         struct platform_device *pdev = to_platform_device(dev);
 101         struct irq_domain *msi_domain;
 102         int ret, nvec;
 103
 104         msi_domain = dev_get_msi_domain(dev);
 105         if (!msi_domain)
 106                 return -EINVAL;
 107
 108         if (pdev->id < 0)
 109                 return -ENODEV;
 110
 111         nvec = ti_sci_inta_msi_alloc_descs(dev, res);
 112         if (nvec <= 0)
 113                 return nvec;
 114
 115         ret = msi_domain_alloc_irqs(msi_domain, dev, nvec);
 116         if (ret) {
 117                 dev_err(dev, "Failed to allocate IRQs %d\n", ret);
 118                 goto cleanup;
 119         }
 120
 121         return 0;
 122
 123 cleanup:
 124         ti_sci_inta_msi_free_descs(&pdev->dev);
 125         return ret;
 126 }
 127 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs);
 128
 129 void ti_sci_inta_msi_domain_free_irqs(struct device *dev)
 130 {
 131         msi_domain_free_irqs(dev->msi_domain, dev);
 132         ti_sci_inta_msi_free_descs(dev);
 133 }
 134 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_free_irqs);
 135
 136 unsigned int ti_sci_inta_msi_get_virq(struct device *dev, u32 dev_index)
 137 {
 138         struct msi_desc *desc;
 139
 140         for_each_msi_entry(desc, dev)
 141                 if (desc->inta.dev_index == dev_index)
 142                         return desc->irq;
 143
 144         return -ENODEV;
 145 }
 146 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_get_virq);