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bus: fsl-mc: dpio: add the DPAA2 DPIO object driver
The DPIO driver registers with the fsl-mc bus to handle bus-related events for DPIO objects. Key responsibility is mapping I/O regions, setting up interrupt handlers, and calling the DPIO service initialization during probe. Signed-off-by: Roy Pledge <roy.pledge@nxp.com> Signed-off-by: Haiying Wang <haiying.wang@nxp.com> Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roy Pledge
Greg Kroah-Hartman
parent
780b626323
commit
993fec7e11
@ -6,4 +6,4 @@ subdir-ccflags-y := -Werror
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obj-$(CONFIG_FSL_MC_DPIO) += fsl-mc-dpio.o
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fsl-mc-dpio-objs := dpio.o qbman-portal.o dpio-service.o
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fsl-mc-dpio-objs := dpio.o qbman-portal.o dpio-service.o dpio-driver.o
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296
drivers/staging/fsl-mc/bus/dpio/dpio-driver.c
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296
drivers/staging/fsl-mc/bus/dpio/dpio-driver.c
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@ -0,0 +1,296 @@
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/*
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* Copyright 2014-2016 Freescale Semiconductor Inc.
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* Copyright NXP 2016
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Freescale Semiconductor nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* ALTERNATIVELY, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") as published by the Free Software
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* Foundation, either version 2 of that License or (at your option) any
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* later version.
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*
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* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/msi.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include "../../include/mc.h"
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#include "../../include/dpaa2-io.h"
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#include "qbman-portal.h"
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#include "dpio.h"
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#include "dpio-cmd.h"
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Freescale Semiconductor, Inc");
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MODULE_DESCRIPTION("DPIO Driver");
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struct dpio_priv {
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struct dpaa2_io *io;
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};
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static irqreturn_t dpio_irq_handler(int irq_num, void *arg)
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{
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struct device *dev = (struct device *)arg;
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struct dpio_priv *priv = dev_get_drvdata(dev);
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return dpaa2_io_irq(priv->io);
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}
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static void unregister_dpio_irq_handlers(struct fsl_mc_device *dpio_dev)
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{
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struct fsl_mc_device_irq *irq;
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irq = dpio_dev->irqs[0];
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/* clear the affinity hint */
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irq_set_affinity_hint(irq->msi_desc->irq, NULL);
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}
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static int register_dpio_irq_handlers(struct fsl_mc_device *dpio_dev, int cpu)
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{
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struct dpio_priv *priv;
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int error;
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struct fsl_mc_device_irq *irq;
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cpumask_t mask;
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priv = dev_get_drvdata(&dpio_dev->dev);
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irq = dpio_dev->irqs[0];
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error = devm_request_irq(&dpio_dev->dev,
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irq->msi_desc->irq,
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dpio_irq_handler,
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0,
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dev_name(&dpio_dev->dev),
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&dpio_dev->dev);
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if (error < 0) {
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dev_err(&dpio_dev->dev,
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"devm_request_irq() failed: %d\n",
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error);
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return error;
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}
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/* set the affinity hint */
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cpumask_clear(&mask);
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cpumask_set_cpu(cpu, &mask);
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if (irq_set_affinity_hint(irq->msi_desc->irq, &mask))
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dev_err(&dpio_dev->dev,
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"irq_set_affinity failed irq %d cpu %d\n",
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irq->msi_desc->irq, cpu);
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return 0;
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}
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static int dpaa2_dpio_probe(struct fsl_mc_device *dpio_dev)
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{
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struct dpio_attr dpio_attrs;
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struct dpaa2_io_desc desc;
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struct dpio_priv *priv;
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int err = -ENOMEM;
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struct device *dev = &dpio_dev->dev;
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static int next_cpu = -1;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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goto err_priv_alloc;
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dev_set_drvdata(dev, priv);
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err = fsl_mc_portal_allocate(dpio_dev, 0, &dpio_dev->mc_io);
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if (err) {
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dev_dbg(dev, "MC portal allocation failed\n");
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err = -EPROBE_DEFER;
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goto err_mcportal;
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}
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err = dpio_open(dpio_dev->mc_io, 0, dpio_dev->obj_desc.id,
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&dpio_dev->mc_handle);
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if (err) {
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dev_err(dev, "dpio_open() failed\n");
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goto err_open;
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}
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err = dpio_get_attributes(dpio_dev->mc_io, 0, dpio_dev->mc_handle,
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&dpio_attrs);
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if (err) {
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dev_err(dev, "dpio_get_attributes() failed %d\n", err);
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goto err_get_attr;
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}
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desc.qman_version = dpio_attrs.qbman_version;
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err = dpio_enable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
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if (err) {
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dev_err(dev, "dpio_enable() failed %d\n", err);
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goto err_get_attr;
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}
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/* initialize DPIO descriptor */
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desc.receives_notifications = dpio_attrs.num_priorities ? 1 : 0;
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desc.has_8prio = dpio_attrs.num_priorities == 8 ? 1 : 0;
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desc.dpio_id = dpio_dev->obj_desc.id;
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/* get the cpu to use for the affinity hint */
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if (next_cpu == -1)
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next_cpu = cpumask_first(cpu_online_mask);
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else
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next_cpu = cpumask_next(next_cpu, cpu_online_mask);
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if (!cpu_possible(next_cpu)) {
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dev_err(dev, "probe failed. Number of DPIOs exceeds NR_CPUS.\n");
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err = -ERANGE;
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goto err_allocate_irqs;
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}
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desc.cpu = next_cpu;
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/*
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* Set the CENA regs to be the cache inhibited area of the portal to
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* avoid coherency issues if a user migrates to another core.
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*/
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desc.regs_cena = ioremap_wc(dpio_dev->regions[1].start,
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resource_size(&dpio_dev->regions[1]));
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desc.regs_cinh = ioremap(dpio_dev->regions[1].start,
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resource_size(&dpio_dev->regions[1]));
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err = fsl_mc_allocate_irqs(dpio_dev);
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if (err) {
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dev_err(dev, "fsl_mc_allocate_irqs failed. err=%d\n", err);
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goto err_allocate_irqs;
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}
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err = register_dpio_irq_handlers(dpio_dev, desc.cpu);
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if (err)
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goto err_register_dpio_irq;
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priv->io = dpaa2_io_create(&desc);
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if (!priv->io) {
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dev_err(dev, "dpaa2_io_create failed\n");
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goto err_dpaa2_io_create;
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}
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dev_info(dev, "probed\n");
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dev_dbg(dev, " receives_notifications = %d\n",
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desc.receives_notifications);
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dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
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fsl_mc_portal_free(dpio_dev->mc_io);
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return 0;
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err_dpaa2_io_create:
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unregister_dpio_irq_handlers(dpio_dev);
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err_register_dpio_irq:
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fsl_mc_free_irqs(dpio_dev);
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err_allocate_irqs:
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dpio_disable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
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err_get_attr:
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dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
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err_open:
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fsl_mc_portal_free(dpio_dev->mc_io);
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err_mcportal:
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dev_set_drvdata(dev, NULL);
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err_priv_alloc:
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return err;
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}
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/* Tear down interrupts for a given DPIO object */
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static void dpio_teardown_irqs(struct fsl_mc_device *dpio_dev)
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{
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unregister_dpio_irq_handlers(dpio_dev);
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fsl_mc_free_irqs(dpio_dev);
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}
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static int dpaa2_dpio_remove(struct fsl_mc_device *dpio_dev)
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{
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struct device *dev;
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struct dpio_priv *priv;
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int err;
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dev = &dpio_dev->dev;
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priv = dev_get_drvdata(dev);
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dpaa2_io_down(priv->io);
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dpio_teardown_irqs(dpio_dev);
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err = fsl_mc_portal_allocate(dpio_dev, 0, &dpio_dev->mc_io);
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if (err) {
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dev_err(dev, "MC portal allocation failed\n");
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goto err_mcportal;
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}
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err = dpio_open(dpio_dev->mc_io, 0, dpio_dev->obj_desc.id,
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&dpio_dev->mc_handle);
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if (err) {
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dev_err(dev, "dpio_open() failed\n");
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goto err_open;
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}
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dpio_disable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
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dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
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fsl_mc_portal_free(dpio_dev->mc_io);
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dev_set_drvdata(dev, NULL);
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return 0;
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err_open:
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fsl_mc_portal_free(dpio_dev->mc_io);
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err_mcportal:
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return err;
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}
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static const struct fsl_mc_device_id dpaa2_dpio_match_id_table[] = {
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{
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.vendor = FSL_MC_VENDOR_FREESCALE,
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.obj_type = "dpio",
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},
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{ .vendor = 0x0 }
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};
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static struct fsl_mc_driver dpaa2_dpio_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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.owner = THIS_MODULE,
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},
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.probe = dpaa2_dpio_probe,
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.remove = dpaa2_dpio_remove,
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.match_id_table = dpaa2_dpio_match_id_table
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};
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static int dpio_driver_init(void)
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{
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return fsl_mc_driver_register(&dpaa2_dpio_driver);
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}
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static void dpio_driver_exit(void)
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{
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fsl_mc_driver_unregister(&dpaa2_dpio_driver);
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}
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module_init(dpio_driver_init);
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module_exit(dpio_driver_exit);
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