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5026cf6051
Before destroying the mc_io, check first that it was allocated. Reviewed-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com> Link: https://lore.kernel.org/r/20200929085441.17448-11-diana.craciun@oss.nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
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/*
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* Copyright 2013-2016 Freescale Semiconductor Inc.
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*
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*/
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#include <linux/io.h>
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#include <linux/fsl/mc.h>
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#include "fsl-mc-private.h"
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static int fsl_mc_io_set_dpmcp(struct fsl_mc_io *mc_io,
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struct fsl_mc_device *dpmcp_dev)
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{
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int error;
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if (mc_io->dpmcp_dev)
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return -EINVAL;
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if (dpmcp_dev->mc_io)
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return -EINVAL;
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error = dpmcp_open(mc_io,
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0,
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dpmcp_dev->obj_desc.id,
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&dpmcp_dev->mc_handle);
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if (error < 0)
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return error;
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mc_io->dpmcp_dev = dpmcp_dev;
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dpmcp_dev->mc_io = mc_io;
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return 0;
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}
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static void fsl_mc_io_unset_dpmcp(struct fsl_mc_io *mc_io)
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{
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int error;
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struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
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error = dpmcp_close(mc_io,
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0,
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dpmcp_dev->mc_handle);
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if (error < 0) {
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dev_err(&dpmcp_dev->dev, "dpmcp_close() failed: %d\n",
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error);
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}
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mc_io->dpmcp_dev = NULL;
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dpmcp_dev->mc_io = NULL;
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}
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/**
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* Creates an MC I/O object
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*
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* @dev: device to be associated with the MC I/O object
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* @mc_portal_phys_addr: physical address of the MC portal to use
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* @mc_portal_size: size in bytes of the MC portal
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* @dpmcp-dev: Pointer to the DPMCP object associated with this MC I/O
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* object or NULL if none.
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* @flags: flags for the new MC I/O object
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* @new_mc_io: Area to return pointer to newly created MC I/O object
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*
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* Returns '0' on Success; Error code otherwise.
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*/
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int __must_check fsl_create_mc_io(struct device *dev,
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phys_addr_t mc_portal_phys_addr,
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u32 mc_portal_size,
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struct fsl_mc_device *dpmcp_dev,
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u32 flags, struct fsl_mc_io **new_mc_io)
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{
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int error;
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struct fsl_mc_io *mc_io;
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void __iomem *mc_portal_virt_addr;
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struct resource *res;
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mc_io = devm_kzalloc(dev, sizeof(*mc_io), GFP_KERNEL);
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if (!mc_io)
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return -ENOMEM;
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mc_io->dev = dev;
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mc_io->flags = flags;
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mc_io->portal_phys_addr = mc_portal_phys_addr;
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mc_io->portal_size = mc_portal_size;
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if (flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
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raw_spin_lock_init(&mc_io->spinlock);
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else
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mutex_init(&mc_io->mutex);
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res = devm_request_mem_region(dev,
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mc_portal_phys_addr,
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mc_portal_size,
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"mc_portal");
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if (!res) {
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dev_err(dev,
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"devm_request_mem_region failed for MC portal %pa\n",
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&mc_portal_phys_addr);
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return -EBUSY;
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}
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mc_portal_virt_addr = devm_ioremap(dev,
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mc_portal_phys_addr,
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mc_portal_size);
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if (!mc_portal_virt_addr) {
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dev_err(dev,
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"devm_ioremap failed for MC portal %pa\n",
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&mc_portal_phys_addr);
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return -ENXIO;
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}
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mc_io->portal_virt_addr = mc_portal_virt_addr;
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if (dpmcp_dev) {
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error = fsl_mc_io_set_dpmcp(mc_io, dpmcp_dev);
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if (error < 0)
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goto error_destroy_mc_io;
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}
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*new_mc_io = mc_io;
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return 0;
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error_destroy_mc_io:
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fsl_destroy_mc_io(mc_io);
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return error;
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}
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/**
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* Destroys an MC I/O object
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*
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* @mc_io: MC I/O object to destroy
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*/
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void fsl_destroy_mc_io(struct fsl_mc_io *mc_io)
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{
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struct fsl_mc_device *dpmcp_dev;
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if (!mc_io)
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return;
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dpmcp_dev = mc_io->dpmcp_dev;
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if (dpmcp_dev)
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fsl_mc_io_unset_dpmcp(mc_io);
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devm_iounmap(mc_io->dev, mc_io->portal_virt_addr);
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devm_release_mem_region(mc_io->dev,
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mc_io->portal_phys_addr,
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mc_io->portal_size);
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mc_io->portal_virt_addr = NULL;
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devm_kfree(mc_io->dev, mc_io);
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}
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/**
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* fsl_mc_portal_allocate - Allocates an MC portal
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*
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* @mc_dev: MC device for which the MC portal is to be allocated
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* @mc_io_flags: Flags for the fsl_mc_io object that wraps the allocated
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* MC portal.
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* @new_mc_io: Pointer to area where the pointer to the fsl_mc_io object
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* that wraps the allocated MC portal is to be returned
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*
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* This function allocates an MC portal from the device's parent DPRC,
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* from the corresponding MC bus' pool of MC portals and wraps
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* it in a new fsl_mc_io object. If 'mc_dev' is a DPRC itself, the
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* portal is allocated from its own MC bus.
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*/
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int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
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u16 mc_io_flags,
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struct fsl_mc_io **new_mc_io)
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{
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struct fsl_mc_device *mc_bus_dev;
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struct fsl_mc_bus *mc_bus;
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phys_addr_t mc_portal_phys_addr;
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size_t mc_portal_size;
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struct fsl_mc_device *dpmcp_dev;
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int error = -EINVAL;
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struct fsl_mc_resource *resource = NULL;
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struct fsl_mc_io *mc_io = NULL;
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if (mc_dev->flags & FSL_MC_IS_DPRC) {
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mc_bus_dev = mc_dev;
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} else {
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if (!dev_is_fsl_mc(mc_dev->dev.parent))
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return error;
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mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
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}
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mc_bus = to_fsl_mc_bus(mc_bus_dev);
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*new_mc_io = NULL;
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error = fsl_mc_resource_allocate(mc_bus, FSL_MC_POOL_DPMCP, &resource);
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if (error < 0)
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return error;
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error = -EINVAL;
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dpmcp_dev = resource->data;
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if (dpmcp_dev->obj_desc.ver_major < DPMCP_MIN_VER_MAJOR ||
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(dpmcp_dev->obj_desc.ver_major == DPMCP_MIN_VER_MAJOR &&
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dpmcp_dev->obj_desc.ver_minor < DPMCP_MIN_VER_MINOR)) {
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dev_err(&dpmcp_dev->dev,
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"ERROR: Version %d.%d of DPMCP not supported.\n",
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dpmcp_dev->obj_desc.ver_major,
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dpmcp_dev->obj_desc.ver_minor);
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error = -ENOTSUPP;
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goto error_cleanup_resource;
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}
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mc_portal_phys_addr = dpmcp_dev->regions[0].start;
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mc_portal_size = resource_size(dpmcp_dev->regions);
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error = fsl_create_mc_io(&mc_bus_dev->dev,
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mc_portal_phys_addr,
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mc_portal_size, dpmcp_dev,
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mc_io_flags, &mc_io);
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if (error < 0)
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goto error_cleanup_resource;
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dpmcp_dev->consumer_link = device_link_add(&mc_dev->dev,
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&dpmcp_dev->dev,
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DL_FLAG_AUTOREMOVE_CONSUMER);
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if (!dpmcp_dev->consumer_link) {
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error = -EINVAL;
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goto error_cleanup_mc_io;
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}
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*new_mc_io = mc_io;
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return 0;
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error_cleanup_mc_io:
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fsl_destroy_mc_io(mc_io);
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error_cleanup_resource:
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fsl_mc_resource_free(resource);
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return error;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_portal_allocate);
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/**
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* fsl_mc_portal_free - Returns an MC portal to the pool of free MC portals
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* of a given MC bus
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*
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* @mc_io: Pointer to the fsl_mc_io object that wraps the MC portal to free
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*/
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void fsl_mc_portal_free(struct fsl_mc_io *mc_io)
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{
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struct fsl_mc_device *dpmcp_dev;
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struct fsl_mc_resource *resource;
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/*
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* Every mc_io obtained by calling fsl_mc_portal_allocate() is supposed
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* to have a DPMCP object associated with.
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*/
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dpmcp_dev = mc_io->dpmcp_dev;
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resource = dpmcp_dev->resource;
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if (!resource || resource->type != FSL_MC_POOL_DPMCP)
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return;
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if (resource->data != dpmcp_dev)
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return;
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fsl_destroy_mc_io(mc_io);
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fsl_mc_resource_free(resource);
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dpmcp_dev->consumer_link = NULL;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_portal_free);
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/**
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* fsl_mc_portal_reset - Resets the dpmcp object for a given fsl_mc_io object
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*
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* @mc_io: Pointer to the fsl_mc_io object that wraps the MC portal to free
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*/
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int fsl_mc_portal_reset(struct fsl_mc_io *mc_io)
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{
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int error;
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struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
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error = dpmcp_reset(mc_io, 0, dpmcp_dev->mc_handle);
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if (error < 0) {
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dev_err(&dpmcp_dev->dev, "dpmcp_reset() failed: %d\n", error);
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return error;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_portal_reset);
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