linux/drivers/bus/fsl-mc/mc-io.c

269 lines
6.5 KiB
C

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