1 files changed, 343 insertions, 0 deletions

diff --git a/drivers/soc/fsl/dpio/dpio-driver.c b/drivers/soc/fsl/dpio/dpio-driver.c
new file mode 100644
index 000000000..7f397b4ad
--- /dev/null
+++ b/drivers/soc/fsl/dpio/dpio-driver.c
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright 2014-2016 Freescale Semiconductor Inc.
+ * Copyright NXP 2016
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/msi.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/sys_soc.h>
+
+#include <linux/fsl/mc.h>
+#include <soc/fsl/dpaa2-io.h>
+
+#include "qbman-portal.h"
+#include "dpio.h"
+#include "dpio-cmd.h"
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Freescale Semiconductor, Inc");
+MODULE_DESCRIPTION("DPIO Driver");
+
+struct dpio_priv {
+	struct dpaa2_io *io;
+};
+
+static cpumask_var_t cpus_unused_mask;
+
+static const struct soc_device_attribute ls1088a_soc[] = {
+	{.family = "QorIQ LS1088A"},
+	{ /* sentinel */ }
+};
+
+static const struct soc_device_attribute ls2080a_soc[] = {
+	{.family = "QorIQ LS2080A"},
+	{ /* sentinel */ }
+};
+
+static const struct soc_device_attribute ls2088a_soc[] = {
+	{.family = "QorIQ LS2088A"},
+	{ /* sentinel */ }
+};
+
+static const struct soc_device_attribute lx2160a_soc[] = {
+	{.family = "QorIQ LX2160A"},
+	{ /* sentinel */ }
+};
+
+static int dpaa2_dpio_get_cluster_sdest(struct fsl_mc_device *dpio_dev, int cpu)
+{
+	int cluster_base, cluster_size;
+
+	if (soc_device_match(ls1088a_soc)) {
+		cluster_base = 2;
+		cluster_size = 4;
+	} else if (soc_device_match(ls2080a_soc) ||
+		   soc_device_match(ls2088a_soc) ||
+		   soc_device_match(lx2160a_soc)) {
+		cluster_base = 0;
+		cluster_size = 2;
+	} else {
+		dev_err(&dpio_dev->dev, "unknown SoC version\n");
+		return -1;
+	}
+
+	return cluster_base + cpu / cluster_size;
+}
+
+static irqreturn_t dpio_irq_handler(int irq_num, void *arg)
+{
+	struct device *dev = (struct device *)arg;
+	struct dpio_priv *priv = dev_get_drvdata(dev);
+
+	return dpaa2_io_irq(priv->io);
+}
+
+static void unregister_dpio_irq_handlers(struct fsl_mc_device *dpio_dev)
+{
+	struct fsl_mc_device_irq *irq;
+
+	irq = dpio_dev->irqs[0];
+
+	/* clear the affinity hint */
+	irq_set_affinity_hint(irq->msi_desc->irq, NULL);
+}
+
+static int register_dpio_irq_handlers(struct fsl_mc_device *dpio_dev, int cpu)
+{
+	int error;
+	struct fsl_mc_device_irq *irq;
+
+	irq = dpio_dev->irqs[0];
+	error = devm_request_irq(&dpio_dev->dev,
+				 irq->msi_desc->irq,
+				 dpio_irq_handler,
+				 0,
+				 dev_name(&dpio_dev->dev),
+				 &dpio_dev->dev);
+	if (error < 0) {
+		dev_err(&dpio_dev->dev,
+			"devm_request_irq() failed: %d\n",
+			error);
+		return error;
+	}
+
+	/* set the affinity hint */
+	if (irq_set_affinity_hint(irq->msi_desc->irq, cpumask_of(cpu)))
+		dev_err(&dpio_dev->dev,
+			"irq_set_affinity failed irq %d cpu %d\n",
+			irq->msi_desc->irq, cpu);
+
+	return 0;
+}
+
+static int dpaa2_dpio_probe(struct fsl_mc_device *dpio_dev)
+{
+	struct dpio_attr dpio_attrs;
+	struct dpaa2_io_desc desc;
+	struct dpio_priv *priv;
+	int err = -ENOMEM;
+	struct device *dev = &dpio_dev->dev;
+	int possible_next_cpu;
+	int sdest;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		goto err_priv_alloc;
+
+	dev_set_drvdata(dev, priv);
+
+	err = fsl_mc_portal_allocate(dpio_dev, 0, &dpio_dev->mc_io);
+	if (err) {
+		dev_dbg(dev, "MC portal allocation failed\n");
+		err = -EPROBE_DEFER;
+		goto err_priv_alloc;
+	}
+
+	err = dpio_open(dpio_dev->mc_io, 0, dpio_dev->obj_desc.id,
+			&dpio_dev->mc_handle);
+	if (err) {
+		dev_err(dev, "dpio_open() failed\n");
+		goto err_open;
+	}
+
+	err = dpio_reset(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+	if (err) {
+		dev_err(dev, "dpio_reset() failed\n");
+		goto err_reset;
+	}
+
+	err = dpio_get_attributes(dpio_dev->mc_io, 0, dpio_dev->mc_handle,
+				  &dpio_attrs);
+	if (err) {
+		dev_err(dev, "dpio_get_attributes() failed %d\n", err);
+		goto err_get_attr;
+	}
+	desc.qman_version = dpio_attrs.qbman_version;
+
+	err = dpio_enable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+	if (err) {
+		dev_err(dev, "dpio_enable() failed %d\n", err);
+		goto err_get_attr;
+	}
+
+	/* initialize DPIO descriptor */
+	desc.receives_notifications = dpio_attrs.num_priorities ? 1 : 0;
+	desc.has_8prio = dpio_attrs.num_priorities == 8 ? 1 : 0;
+	desc.dpio_id = dpio_dev->obj_desc.id;
+
+	/* get the cpu to use for the affinity hint */
+	possible_next_cpu = cpumask_first(cpus_unused_mask);
+	if (possible_next_cpu >= nr_cpu_ids) {
+		dev_err(dev, "probe failed. Number of DPIOs exceeds NR_CPUS.\n");
+		err = -ERANGE;
+		goto err_allocate_irqs;
+	}
+	desc.cpu = possible_next_cpu;
+	cpumask_clear_cpu(possible_next_cpu, cpus_unused_mask);
+
+	sdest = dpaa2_dpio_get_cluster_sdest(dpio_dev, desc.cpu);
+	if (sdest >= 0) {
+		err = dpio_set_stashing_destination(dpio_dev->mc_io, 0,
+						    dpio_dev->mc_handle,
+						    sdest);
+		if (err)
+			dev_err(dev, "dpio_set_stashing_destination failed for cpu%d\n",
+				desc.cpu);
+	}
+
+	if (dpio_dev->obj_desc.region_count < 3) {
+		/* No support for DDR backed portals, use classic mapping */
+		/*
+		 * Set the CENA regs to be the cache inhibited area of the
+		 * portal to avoid coherency issues if a user migrates to
+		 * another core.
+		 */
+		desc.regs_cena = devm_memremap(dev, dpio_dev->regions[1].start,
+					resource_size(&dpio_dev->regions[1]),
+					MEMREMAP_WC);
+	} else {
+		desc.regs_cena = devm_memremap(dev, dpio_dev->regions[2].start,
+					resource_size(&dpio_dev->regions[2]),
+					MEMREMAP_WB);
+	}
+
+	if (IS_ERR(desc.regs_cena)) {
+		dev_err(dev, "devm_memremap failed\n");
+		err = PTR_ERR(desc.regs_cena);
+		goto err_allocate_irqs;
+	}
+
+	desc.regs_cinh = devm_ioremap(dev, dpio_dev->regions[1].start,
+				      resource_size(&dpio_dev->regions[1]));
+	if (!desc.regs_cinh) {
+		err = -ENOMEM;
+		dev_err(dev, "devm_ioremap failed\n");
+		goto err_allocate_irqs;
+	}
+
+	err = fsl_mc_allocate_irqs(dpio_dev);
+	if (err) {
+		dev_err(dev, "fsl_mc_allocate_irqs failed. err=%d\n", err);
+		goto err_allocate_irqs;
+	}
+
+	priv->io = dpaa2_io_create(&desc, dev);
+	if (!priv->io) {
+		dev_err(dev, "dpaa2_io_create failed\n");
+		err = -ENOMEM;
+		goto err_dpaa2_io_create;
+	}
+
+	err = register_dpio_irq_handlers(dpio_dev, desc.cpu);
+	if (err)
+		goto err_register_dpio_irq;
+
+	dev_info(dev, "probed\n");
+	dev_dbg(dev, "   receives_notifications = %d\n",
+		desc.receives_notifications);
+	dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+
+	return 0;
+
+err_dpaa2_io_create:
+	unregister_dpio_irq_handlers(dpio_dev);
+err_register_dpio_irq:
+	fsl_mc_free_irqs(dpio_dev);
+err_allocate_irqs:
+	dpio_disable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+err_get_attr:
+err_reset:
+	dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+err_open:
+	fsl_mc_portal_free(dpio_dev->mc_io);
+err_priv_alloc:
+	return err;
+}
+
+/* Tear down interrupts for a given DPIO object */
+static void dpio_teardown_irqs(struct fsl_mc_device *dpio_dev)
+{
+	unregister_dpio_irq_handlers(dpio_dev);
+	fsl_mc_free_irqs(dpio_dev);
+}
+
+static int dpaa2_dpio_remove(struct fsl_mc_device *dpio_dev)
+{
+	struct device *dev;
+	struct dpio_priv *priv;
+	int err = 0, cpu;
+
+	dev = &dpio_dev->dev;
+	priv = dev_get_drvdata(dev);
+	cpu = dpaa2_io_get_cpu(priv->io);
+
+	dpaa2_io_down(priv->io);
+
+	dpio_teardown_irqs(dpio_dev);
+
+	cpumask_set_cpu(cpu, cpus_unused_mask);
+
+	err = dpio_open(dpio_dev->mc_io, 0, dpio_dev->obj_desc.id,
+			&dpio_dev->mc_handle);
+	if (err) {
+		dev_err(dev, "dpio_open() failed\n");
+		goto err_open;
+	}
+
+	dpio_disable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+
+	dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+
+	fsl_mc_portal_free(dpio_dev->mc_io);
+
+	return 0;
+
+err_open:
+	fsl_mc_portal_free(dpio_dev->mc_io);
+
+	return err;
+}
+
+static const struct fsl_mc_device_id dpaa2_dpio_match_id_table[] = {
+	{
+		.vendor = FSL_MC_VENDOR_FREESCALE,
+		.obj_type = "dpio",
+	},
+	{ .vendor = 0x0 }
+};
+
+static struct fsl_mc_driver dpaa2_dpio_driver = {
+	.driver = {
+		.name		= KBUILD_MODNAME,
+		.owner		= THIS_MODULE,
+	},
+	.probe		= dpaa2_dpio_probe,
+	.remove		= dpaa2_dpio_remove,
+	.match_id_table = dpaa2_dpio_match_id_table
+};
+
+static int dpio_driver_init(void)
+{
+	if (!zalloc_cpumask_var(&cpus_unused_mask, GFP_KERNEL))
+		return -ENOMEM;
+	cpumask_copy(cpus_unused_mask, cpu_online_mask);
+
+	return fsl_mc_driver_register(&dpaa2_dpio_driver);
+}
+
+static void dpio_driver_exit(void)
+{
+	free_cpumask_var(cpus_unused_mask);
+	fsl_mc_driver_unregister(&dpaa2_dpio_driver);
+}
+module_init(dpio_driver_init);
+module_exit(dpio_driver_exit);