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1// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)2/*3 * Copyright 2014-2016 Freescale Semiconductor Inc.4 * Copyright NXP 20165 *6 */7 8#include <linux/types.h>9#include <linux/init.h>10#include <linux/module.h>11#include <linux/platform_device.h>12#include <linux/interrupt.h>13#include <linux/dma-mapping.h>14#include <linux/delay.h>15#include <linux/io.h>16#include <linux/sys_soc.h>17 18#include <linux/fsl/mc.h>19#include <soc/fsl/dpaa2-io.h>20 21#include "qbman-portal.h"22#include "dpio.h"23#include "dpio-cmd.h"24 25MODULE_LICENSE("Dual BSD/GPL");26MODULE_AUTHOR("Freescale Semiconductor, Inc");27MODULE_DESCRIPTION("DPIO Driver");28 29struct dpio_priv {30 struct dpaa2_io *io;31};32 33static cpumask_var_t cpus_unused_mask;34 35static const struct soc_device_attribute ls1088a_soc[] = {36 {.family = "QorIQ LS1088A"},37 { /* sentinel */ }38};39 40static const struct soc_device_attribute ls2080a_soc[] = {41 {.family = "QorIQ LS2080A"},42 { /* sentinel */ }43};44 45static const struct soc_device_attribute ls2088a_soc[] = {46 {.family = "QorIQ LS2088A"},47 { /* sentinel */ }48};49 50static const struct soc_device_attribute lx2160a_soc[] = {51 {.family = "QorIQ LX2160A"},52 { /* sentinel */ }53};54 55static int dpaa2_dpio_get_cluster_sdest(struct fsl_mc_device *dpio_dev, int cpu)56{57 int cluster_base, cluster_size;58 59 if (soc_device_match(ls1088a_soc)) {60 cluster_base = 2;61 cluster_size = 4;62 } else if (soc_device_match(ls2080a_soc) ||63 soc_device_match(ls2088a_soc) ||64 soc_device_match(lx2160a_soc)) {65 cluster_base = 0;66 cluster_size = 2;67 } else {68 dev_err(&dpio_dev->dev, "unknown SoC version\n");69 return -1;70 }71 72 return cluster_base + cpu / cluster_size;73}74 75static irqreturn_t dpio_irq_handler(int irq_num, void *arg)76{77 struct device *dev = (struct device *)arg;78 struct dpio_priv *priv = dev_get_drvdata(dev);79 80 return dpaa2_io_irq(priv->io);81}82 83static void unregister_dpio_irq_handlers(struct fsl_mc_device *dpio_dev)84{85 struct fsl_mc_device_irq *irq;86 87 irq = dpio_dev->irqs[0];88 89 /* clear the affinity hint */90 irq_set_affinity_hint(irq->virq, NULL);91}92 93static int register_dpio_irq_handlers(struct fsl_mc_device *dpio_dev, int cpu)94{95 int error;96 struct fsl_mc_device_irq *irq;97 98 irq = dpio_dev->irqs[0];99 error = devm_request_irq(&dpio_dev->dev,100 irq->virq,101 dpio_irq_handler,102 0,103 dev_name(&dpio_dev->dev),104 &dpio_dev->dev);105 if (error < 0) {106 dev_err(&dpio_dev->dev,107 "devm_request_irq() failed: %d\n",108 error);109 return error;110 }111 112 /* set the affinity hint */113 if (irq_set_affinity_hint(irq->virq, cpumask_of(cpu)))114 dev_err(&dpio_dev->dev,115 "irq_set_affinity failed irq %d cpu %d\n",116 irq->virq, cpu);117 118 return 0;119}120 121static int dpaa2_dpio_probe(struct fsl_mc_device *dpio_dev)122{123 struct dpio_attr dpio_attrs;124 struct dpaa2_io_desc desc;125 struct dpio_priv *priv;126 int err = -ENOMEM;127 struct device *dev = &dpio_dev->dev;128 int possible_next_cpu;129 int sdest;130 131 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);132 if (!priv)133 goto err_priv_alloc;134 135 dev_set_drvdata(dev, priv);136 137 err = fsl_mc_portal_allocate(dpio_dev, 0, &dpio_dev->mc_io);138 if (err) {139 dev_dbg(dev, "MC portal allocation failed\n");140 err = -EPROBE_DEFER;141 goto err_priv_alloc;142 }143 144 err = dpio_open(dpio_dev->mc_io, 0, dpio_dev->obj_desc.id,145 &dpio_dev->mc_handle);146 if (err) {147 dev_err(dev, "dpio_open() failed\n");148 goto err_open;149 }150 151 err = dpio_reset(dpio_dev->mc_io, 0, dpio_dev->mc_handle);152 if (err) {153 dev_err(dev, "dpio_reset() failed\n");154 goto err_reset;155 }156 157 err = dpio_get_attributes(dpio_dev->mc_io, 0, dpio_dev->mc_handle,158 &dpio_attrs);159 if (err) {160 dev_err(dev, "dpio_get_attributes() failed %d\n", err);161 goto err_get_attr;162 }163 desc.qman_version = dpio_attrs.qbman_version;164 desc.qman_clk = dpio_attrs.clk;165 166 err = dpio_enable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);167 if (err) {168 dev_err(dev, "dpio_enable() failed %d\n", err);169 goto err_get_attr;170 }171 172 /* initialize DPIO descriptor */173 desc.receives_notifications = dpio_attrs.num_priorities ? 1 : 0;174 desc.has_8prio = dpio_attrs.num_priorities == 8 ? 1 : 0;175 desc.dpio_id = dpio_dev->obj_desc.id;176 177 /* get the cpu to use for the affinity hint */178 possible_next_cpu = cpumask_first(cpus_unused_mask);179 if (possible_next_cpu >= nr_cpu_ids) {180 dev_err(dev, "probe failed. Number of DPIOs exceeds NR_CPUS.\n");181 err = -ERANGE;182 goto err_allocate_irqs;183 }184 desc.cpu = possible_next_cpu;185 cpumask_clear_cpu(possible_next_cpu, cpus_unused_mask);186 187 sdest = dpaa2_dpio_get_cluster_sdest(dpio_dev, desc.cpu);188 if (sdest >= 0) {189 err = dpio_set_stashing_destination(dpio_dev->mc_io, 0,190 dpio_dev->mc_handle,191 sdest);192 if (err)193 dev_err(dev, "dpio_set_stashing_destination failed for cpu%d\n",194 desc.cpu);195 }196 197 if (dpio_dev->obj_desc.region_count < 3) {198 /* No support for DDR backed portals, use classic mapping */199 /*200 * Set the CENA regs to be the cache inhibited area of the201 * portal to avoid coherency issues if a user migrates to202 * another core.203 */204 desc.regs_cena = devm_memremap(dev, dpio_dev->regions[1].start,205 resource_size(&dpio_dev->regions[1]),206 MEMREMAP_WC);207 } else {208 desc.regs_cena = devm_memremap(dev, dpio_dev->regions[2].start,209 resource_size(&dpio_dev->regions[2]),210 MEMREMAP_WB);211 }212 213 if (IS_ERR(desc.regs_cena)) {214 dev_err(dev, "devm_memremap failed\n");215 err = PTR_ERR(desc.regs_cena);216 goto err_allocate_irqs;217 }218 219 desc.regs_cinh = devm_ioremap(dev, dpio_dev->regions[1].start,220 resource_size(&dpio_dev->regions[1]));221 if (!desc.regs_cinh) {222 err = -ENOMEM;223 dev_err(dev, "devm_ioremap failed\n");224 goto err_allocate_irqs;225 }226 227 err = fsl_mc_allocate_irqs(dpio_dev);228 if (err) {229 dev_err(dev, "fsl_mc_allocate_irqs failed. err=%d\n", err);230 goto err_allocate_irqs;231 }232 233 priv->io = dpaa2_io_create(&desc, dev);234 if (!priv->io) {235 dev_err(dev, "dpaa2_io_create failed\n");236 err = -ENOMEM;237 goto err_dpaa2_io_create;238 }239 240 err = register_dpio_irq_handlers(dpio_dev, desc.cpu);241 if (err)242 goto err_register_dpio_irq;243 244 dev_info(dev, "probed\n");245 dev_dbg(dev, " receives_notifications = %d\n",246 desc.receives_notifications);247 dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);248 249 return 0;250 251err_dpaa2_io_create:252 unregister_dpio_irq_handlers(dpio_dev);253err_register_dpio_irq:254 fsl_mc_free_irqs(dpio_dev);255err_allocate_irqs:256 dpio_disable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);257err_get_attr:258err_reset:259 dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);260err_open:261 fsl_mc_portal_free(dpio_dev->mc_io);262err_priv_alloc:263 return err;264}265 266/* Tear down interrupts for a given DPIO object */267static void dpio_teardown_irqs(struct fsl_mc_device *dpio_dev)268{269 unregister_dpio_irq_handlers(dpio_dev);270 fsl_mc_free_irqs(dpio_dev);271}272 273static void dpaa2_dpio_remove(struct fsl_mc_device *dpio_dev)274{275 struct device *dev;276 struct dpio_priv *priv;277 int err = 0, cpu;278 279 dev = &dpio_dev->dev;280 priv = dev_get_drvdata(dev);281 cpu = dpaa2_io_get_cpu(priv->io);282 283 dpaa2_io_down(priv->io);284 285 dpio_teardown_irqs(dpio_dev);286 287 cpumask_set_cpu(cpu, cpus_unused_mask);288 289 err = dpio_open(dpio_dev->mc_io, 0, dpio_dev->obj_desc.id,290 &dpio_dev->mc_handle);291 if (err) {292 dev_err(dev, "dpio_open() failed\n");293 goto err_open;294 }295 296 dpio_disable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);297 298 dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);299 300err_open:301 fsl_mc_portal_free(dpio_dev->mc_io);302}303 304static const struct fsl_mc_device_id dpaa2_dpio_match_id_table[] = {305 {306 .vendor = FSL_MC_VENDOR_FREESCALE,307 .obj_type = "dpio",308 },309 { .vendor = 0x0 }310};311 312static struct fsl_mc_driver dpaa2_dpio_driver = {313 .driver = {314 .name = KBUILD_MODNAME,315 .owner = THIS_MODULE,316 },317 .probe = dpaa2_dpio_probe,318 .remove = dpaa2_dpio_remove,319 .match_id_table = dpaa2_dpio_match_id_table320};321 322static int dpio_driver_init(void)323{324 if (!zalloc_cpumask_var(&cpus_unused_mask, GFP_KERNEL))325 return -ENOMEM;326 cpumask_copy(cpus_unused_mask, cpu_online_mask);327 328 return fsl_mc_driver_register(&dpaa2_dpio_driver);329}330 331static void dpio_driver_exit(void)332{333 free_cpumask_var(cpus_unused_mask);334 fsl_mc_driver_unregister(&dpaa2_dpio_driver);335}336module_init(dpio_driver_init);337module_exit(dpio_driver_exit);338