| /* |
| * Freescale Management Complex (MC) bus driver MSI support |
| * |
| * Copyright (C) 2015 Freescale Semiconductor, Inc. |
| * Author: German Rivera <German.Rivera@freescale.com> |
| * |
| * This file is licensed under the terms of the GNU General Public |
| * License version 2. This program is licensed "as is" without any |
| * warranty of any kind, whether express or implied. |
| */ |
| |
| #include "../include/mc-private.h" |
| #include <linux/of_device.h> |
| #include <linux/of_address.h> |
| #include <linux/irqchip/arm-gic-v3.h> |
| #include <linux/of_irq.h> |
| #include <linux/irq.h> |
| #include <linux/irqdomain.h> |
| #include <linux/msi.h> |
| #include "../include/mc-sys.h" |
| #include "dprc-cmd.h" |
| |
| static void fsl_mc_msi_set_desc(msi_alloc_info_t *arg, |
| struct msi_desc *desc) |
| { |
| arg->desc = desc; |
| arg->hwirq = (irq_hw_number_t)desc->fsl_mc.msi_index; |
| } |
| |
| static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info) |
| { |
| struct msi_domain_ops *ops = info->ops; |
| |
| if (WARN_ON(!ops)) |
| return; |
| |
| /* |
| * set_desc should not be set by the caller |
| */ |
| if (ops->set_desc == NULL) |
| ops->set_desc = fsl_mc_msi_set_desc; |
| } |
| |
| static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev, |
| struct fsl_mc_device_irq *mc_dev_irq) |
| { |
| int error; |
| struct fsl_mc_device *owner_mc_dev = mc_dev_irq->mc_dev; |
| struct msi_desc *msi_desc = mc_dev_irq->msi_desc; |
| struct dprc_irq_cfg irq_cfg; |
| |
| /* |
| * msi_desc->msg.address is 0x0 when this function is invoked in |
| * the free_irq() code path. In this case, for the MC, we don't |
| * really need to "unprogram" the MSI, so we just return. |
| */ |
| if (msi_desc->msg.address_lo == 0x0 && msi_desc->msg.address_hi == 0x0) |
| return; |
| |
| if (WARN_ON(!owner_mc_dev)) |
| return; |
| |
| irq_cfg.paddr = ((u64)msi_desc->msg.address_hi << 32) | |
| msi_desc->msg.address_lo; |
| irq_cfg.val = msi_desc->msg.data; |
| irq_cfg.irq_num = msi_desc->irq; |
| |
| if (owner_mc_dev == mc_bus_dev) { |
| /* |
| * IRQ is for the mc_bus_dev's DPRC itself |
| */ |
| error = dprc_set_irq(mc_bus_dev->mc_io, |
| MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI, |
| mc_bus_dev->mc_handle, |
| mc_dev_irq->dev_irq_index, |
| &irq_cfg); |
| if (error < 0) { |
| dev_err(&owner_mc_dev->dev, |
| "dprc_set_irq() failed: %d\n", error); |
| } |
| } else { |
| /* |
| * IRQ is for for a child device of mc_bus_dev |
| */ |
| error = dprc_set_obj_irq(mc_bus_dev->mc_io, |
| MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI, |
| mc_bus_dev->mc_handle, |
| owner_mc_dev->obj_desc.type, |
| owner_mc_dev->obj_desc.id, |
| mc_dev_irq->dev_irq_index, |
| &irq_cfg); |
| if (error < 0) { |
| dev_err(&owner_mc_dev->dev, |
| "dprc_obj_set_irq() failed: %d\n", error); |
| } |
| } |
| } |
| |
| /* |
| * NOTE: This function is invoked with interrupts disabled |
| */ |
| static void fsl_mc_msi_write_msg(struct irq_data *irq_data, |
| struct msi_msg *msg) |
| { |
| struct msi_desc *msi_desc = irq_data_get_msi_desc(irq_data); |
| struct fsl_mc_device *mc_bus_dev = to_fsl_mc_device(msi_desc->dev); |
| struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); |
| struct fsl_mc_device_irq *mc_dev_irq = |
| &mc_bus->irq_resources[msi_desc->fsl_mc.msi_index]; |
| |
| WARN_ON(mc_dev_irq->msi_desc != msi_desc); |
| msi_desc->msg = *msg; |
| |
| /* |
| * Program the MSI (paddr, value) pair in the device: |
| */ |
| __fsl_mc_msi_write_msg(mc_bus_dev, mc_dev_irq); |
| } |
| |
| static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info) |
| { |
| struct irq_chip *chip = info->chip; |
| |
| if (WARN_ON((!chip))) |
| return; |
| |
| /* |
| * irq_write_msi_msg should not be set by the caller |
| */ |
| if (chip->irq_write_msi_msg == NULL) |
| chip->irq_write_msi_msg = fsl_mc_msi_write_msg; |
| } |
| |
| /** |
| * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain |
| * @np: Optional device-tree node of the interrupt controller |
| * @info: MSI domain info |
| * @parent: Parent irq domain |
| * |
| * Updates the domain and chip ops and creates a fsl-mc MSI |
| * interrupt domain. |
| * |
| * Returns: |
| * A domain pointer or NULL in case of failure. |
| */ |
| struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode, |
| struct msi_domain_info *info, |
| struct irq_domain *parent) |
| { |
| struct irq_domain *domain; |
| |
| if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS) |
| fsl_mc_msi_update_dom_ops(info); |
| if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS) |
| fsl_mc_msi_update_chip_ops(info); |
| |
| domain = msi_create_irq_domain(fwnode, info, parent); |
| if (domain) |
| domain->bus_token = DOMAIN_BUS_FSL_MC_MSI; |
| |
| return domain; |
| } |
| |
| int fsl_mc_find_msi_domain(struct device *mc_platform_dev, |
| struct irq_domain **mc_msi_domain) |
| { |
| struct irq_domain *msi_domain; |
| struct device_node *mc_of_node = mc_platform_dev->of_node; |
| |
| msi_domain = of_msi_get_domain(mc_platform_dev, mc_of_node, |
| DOMAIN_BUS_FSL_MC_MSI); |
| if (!msi_domain) { |
| pr_err("Unable to find fsl-mc MSI domain for %s\n", |
| mc_of_node->full_name); |
| |
| return -ENOENT; |
| } |
| |
| *mc_msi_domain = msi_domain; |
| return 0; |
| } |
| |
| static void fsl_mc_msi_free_descs(struct device *dev) |
| { |
| struct msi_desc *desc, *tmp; |
| |
| list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) { |
| list_del(&desc->list); |
| free_msi_entry(desc); |
| } |
| } |
| |
| static int fsl_mc_msi_alloc_descs(struct device *dev, unsigned int irq_count) |
| |
| { |
| unsigned int i; |
| int error; |
| struct msi_desc *msi_desc; |
| |
| for (i = 0; i < irq_count; i++) { |
| msi_desc = alloc_msi_entry(dev); |
| if (!msi_desc) { |
| dev_err(dev, "Failed to allocate msi entry\n"); |
| error = -ENOMEM; |
| goto cleanup_msi_descs; |
| } |
| |
| msi_desc->fsl_mc.msi_index = i; |
| msi_desc->nvec_used = 1; |
| INIT_LIST_HEAD(&msi_desc->list); |
| list_add_tail(&msi_desc->list, dev_to_msi_list(dev)); |
| } |
| |
| return 0; |
| |
| cleanup_msi_descs: |
| fsl_mc_msi_free_descs(dev); |
| return error; |
| } |
| |
| int fsl_mc_msi_domain_alloc_irqs(struct device *dev, |
| unsigned int irq_count) |
| { |
| struct irq_domain *msi_domain; |
| int error; |
| |
| if (WARN_ON(!list_empty(dev_to_msi_list(dev)))) |
| return -EINVAL; |
| |
| error = fsl_mc_msi_alloc_descs(dev, irq_count); |
| if (error < 0) |
| return error; |
| |
| msi_domain = dev_get_msi_domain(dev); |
| if (WARN_ON(!msi_domain)) { |
| error = -EINVAL; |
| goto cleanup_msi_descs; |
| } |
| |
| /* |
| * NOTE: Calling this function will trigger the invocation of the |
| * its_fsl_mc_msi_prepare() callback |
| */ |
| error = msi_domain_alloc_irqs(msi_domain, dev, irq_count); |
| |
| if (error) { |
| dev_err(dev, "Failed to allocate IRQs\n"); |
| goto cleanup_msi_descs; |
| } |
| |
| return 0; |
| |
| cleanup_msi_descs: |
| fsl_mc_msi_free_descs(dev); |
| return error; |
| } |
| |
| void fsl_mc_msi_domain_free_irqs(struct device *dev) |
| { |
| struct irq_domain *msi_domain; |
| |
| msi_domain = dev_get_msi_domain(dev); |
| if (WARN_ON(!msi_domain)) |
| return; |
| |
| msi_domain_free_irqs(msi_domain, dev); |
| |
| if (WARN_ON(list_empty(dev_to_msi_list(dev)))) |
| return; |
| |
| fsl_mc_msi_free_descs(dev); |
| } |