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Commit 679c2c75 authored by J. German Rivera's avatar J. German Rivera Committed by Greg Kroah-Hartman
Browse files

staging: fsl-mc: Added generic MSI support for FSL-MC devices 



Created an MSI domain for the fsl-mc bus-- including functions
to create a domain, find a domain, alloc/free domain irqs, and
bus specific overrides for domain and irq_chip ops.

Signed-off-by: default avatarJ. German Rivera <German.Rivera@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 550308e4

drivers/staging/fsl-mc/bus/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
config FSL_MC_BUS

	tristate "Freescale Management Complex (MC) bus driver"

	depends on OF && ARM64

	select GENERIC_MSI_IRQ_DOMAIN

	help

	  Driver to enable the bus infrastructure for the Freescale

          QorIQ Management Complex (fsl-mc). The fsl-mc is a hardware

drivers/staging/fsl-mc/bus/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -13,5 +13,6 @@ mc-bus-driver-objs := mc-bus.o \ 
		      dpmng.o \

		      dprc-driver.o \

		      mc-allocator.o \

		      mc-msi.o \

		      dpmcp.o \

		      dpbp.o

drivers/staging/fsl-mc/bus/mc-msi.c

0 → 100644
+276 −0
Original line number Diff line number Diff line 
/*

 * 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 (WARN_ON(ops->set_desc))

		return;



	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.user_irq_id = 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 (WARN_ON(chip->irq_write_msi_msg))

		return;



	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);

}

drivers/staging/fsl-mc/include/dprc.h

+1 −1
Original line number Diff line number Diff line
@@ -176,7 +176,7 @@ int dprc_reset_container(struct fsl_mc_io *mc_io, 
 * @user_irq_id: A user defined number associated with this IRQ

 */

struct dprc_irq_cfg {

	     u64		paddr;

	     phys_addr_t	paddr;

	     u32		val;

	     int		user_irq_id;

};

drivers/staging/fsl-mc/include/mc-private.h

+17 −0
Original line number Diff line number Diff line
@@ -26,6 +26,9 @@ 
	 strcmp(_obj_type, "dpmcp") == 0 || \

	 strcmp(_obj_type, "dpcon") == 0)



struct irq_domain;

struct msi_domain_info;



/**

 * struct fsl_mc - Private data of a "fsl,qoriq-mc" platform device

 * @root_mc_bus_dev: MC object device representing the root DPRC
@@ -79,11 +82,13 @@ struct fsl_mc_resource_pool { 
 * @resource_pools: array of resource pools (one pool per resource type)

 * for this MC bus. These resources represent allocatable entities

 * from the physical DPRC.

 * @irq_resources: Pointer to array of IRQ objects for the IRQ pool

 * @scan_mutex: Serializes bus scanning

 */

struct fsl_mc_bus {

	struct fsl_mc_device mc_dev;

	struct fsl_mc_resource_pool resource_pools[FSL_MC_NUM_POOL_TYPES];

	struct fsl_mc_device_irq *irq_resources;

	struct mutex scan_mutex;    /* serializes bus scanning */

};
@@ -116,4 +121,16 @@ int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus, 


void fsl_mc_resource_free(struct fsl_mc_resource *resource);



struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,

						struct msi_domain_info *info,

						struct irq_domain *parent);



int fsl_mc_find_msi_domain(struct device *mc_platform_dev,

			   struct irq_domain **mc_msi_domain);



int fsl_mc_msi_domain_alloc_irqs(struct device *dev,

				 unsigned int irq_count);



void fsl_mc_msi_domain_free_irqs(struct device *dev);



#endif /* _FSL_MC_PRIVATE_H_ */