diff options
author | Bogdan Purcareata <bogdan.purcareata@nxp.com> | 2018-02-05 08:07:42 -0600 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-22 15:10:50 +0100 |
commit | 6bd067c48efed50ac0200c4a83a415bd524254e0 (patch) | |
tree | 5c89f752c11aff0a51fccbd36098e939800c3f2b /drivers/bus/fsl-mc/mc-io.c | |
parent | 281377cc66137febf3051bf70c506aca99bbc508 (diff) |
staging: fsl-mc: Move core bus out of staging
Move the source files out of staging into their final locations:
-mc.h include file in drivers/staging/fsl-mc/include go to include/linux/fsl
-source files in drivers/staging/fsl-mc/bus go to drivers/bus/fsl-mc
-overview.rst, providing an overview of DPAA2, goes to
Documentation/networking/dpaa2/overview.rst
Update or delete other remaining staging files -- Makefile, Kconfig, TODO.
Update dpaa2_eth and dpio staging drivers.
Add integration bits for the documentation build system.
Signed-off-by: Stuart Yoder <stuyoder@gmail.com>
[rebased, add dpaa2_eth and dpio #include updates]
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
[rebased, split irqchip to separate patch]
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bus/fsl-mc/mc-io.c')
-rw-r--r-- | drivers/bus/fsl-mc/mc-io.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/drivers/bus/fsl-mc/mc-io.c b/drivers/bus/fsl-mc/mc-io.c new file mode 100644 index 000000000000..7226cfc49b6f --- /dev/null +++ b/drivers/bus/fsl-mc/mc-io.c @@ -0,0 +1,268 @@ +// 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); |