| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Freescale Management Complex (MC) bus driver MSI support |
| 4 | * |
| 5 | * Copyright (C) 2015-2016 Freescale Semiconductor, Inc. |
| 6 | * Author: German Rivera <German.Rivera@freescale.com> |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <linux/of_device.h> |
| 11 | #include <linux/of_address.h> |
| 12 | #include <linux/irq.h> |
| 13 | #include <linux/msi.h> |
| 14 | #include <linux/of.h> |
| 15 | #include <linux/of_irq.h> |
| 16 | #include <linux/fsl/mc.h> |
| 17 | |
| 18 | static struct irq_chip its_msi_irq_chip = { |
| 19 | .name = "ITS-fMSI", |
| 20 | .irq_mask = irq_chip_mask_parent, |
| 21 | .irq_unmask = irq_chip_unmask_parent, |
| 22 | .irq_eoi = irq_chip_eoi_parent, |
| 23 | .irq_set_affinity = msi_domain_set_affinity |
| 24 | }; |
| 25 | |
| 26 | static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain, |
| 27 | struct device *dev, |
| 28 | int nvec, msi_alloc_info_t *info) |
| 29 | { |
| 30 | struct fsl_mc_device *mc_bus_dev; |
| 31 | struct msi_domain_info *msi_info; |
| 32 | |
| 33 | if (!dev_is_fsl_mc(dev)) |
| 34 | return -EINVAL; |
| 35 | |
| 36 | mc_bus_dev = to_fsl_mc_device(dev); |
| 37 | if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC)) |
| 38 | return -EINVAL; |
| 39 | |
| 40 | /* |
| 41 | * Set the device Id to be passed to the GIC-ITS: |
| 42 | * |
| 43 | * NOTE: This device id corresponds to the IOMMU stream ID |
| 44 | * associated with the DPRC object (ICID). |
| 45 | */ |
| 46 | info->scratchpad[0].ul = mc_bus_dev->icid; |
| 47 | msi_info = msi_get_domain_info(msi_domain->parent); |
| 48 | |
| 49 | /* Allocate at least 32 MSIs, and always as a power of 2 */ |
| 50 | nvec = max_t(int, 32, roundup_pow_of_two(nvec)); |
| 51 | return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info); |
| 52 | } |
| 53 | |
| 54 | static struct msi_domain_ops its_fsl_mc_msi_ops __ro_after_init = { |
| 55 | .msi_prepare = its_fsl_mc_msi_prepare, |
| 56 | }; |
| 57 | |
| 58 | static struct msi_domain_info its_fsl_mc_msi_domain_info = { |
| 59 | .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), |
| 60 | .ops = &its_fsl_mc_msi_ops, |
| 61 | .chip = &its_msi_irq_chip, |
| 62 | }; |
| 63 | |
| 64 | static const struct of_device_id its_device_id[] = { |
| 65 | { .compatible = "arm,gic-v3-its", }, |
| 66 | {}, |
| 67 | }; |
| 68 | |
| 69 | static int __init its_fsl_mc_msi_init(void) |
| 70 | { |
| 71 | struct device_node *np; |
| 72 | struct irq_domain *parent; |
| 73 | struct irq_domain *mc_msi_domain; |
| 74 | |
| 75 | for (np = of_find_matching_node(NULL, its_device_id); np; |
| 76 | np = of_find_matching_node(np, its_device_id)) { |
| 77 | if (!of_device_is_available(np)) |
| 78 | continue; |
| 79 | if (!of_property_read_bool(np, "msi-controller")) |
| 80 | continue; |
| 81 | |
| 82 | parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS); |
| 83 | if (!parent || !msi_get_domain_info(parent)) { |
| 84 | pr_err("%pOF: unable to locate ITS domain\n", np); |
| 85 | continue; |
| 86 | } |
| 87 | |
| 88 | mc_msi_domain = fsl_mc_msi_create_irq_domain( |
| 89 | of_node_to_fwnode(np), |
| 90 | &its_fsl_mc_msi_domain_info, |
| 91 | parent); |
| 92 | if (!mc_msi_domain) { |
| 93 | pr_err("%pOF: unable to create fsl-mc domain\n", np); |
| 94 | continue; |
| 95 | } |
| 96 | |
| 97 | pr_info("fsl-mc MSI: %pOF domain created\n", np); |
| 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | early_initcall(its_fsl_mc_msi_init); |