245 lines
6.3 KiB
C
245 lines
6.3 KiB
C
/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
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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 "bman_priv.h"
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static struct bman_portal *affine_bportals[NR_CPUS];
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static struct cpumask portal_cpus;
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static int __bman_portals_probed;
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/* protect bman global registers and global data shared among portals */
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static DEFINE_SPINLOCK(bman_lock);
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static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)
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{
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struct bman_portal *p = bman_create_affine_portal(pcfg);
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if (!p) {
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dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
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__func__, pcfg->cpu);
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return NULL;
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}
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bman_p_irqsource_add(p, BM_PIRQ_RCRI);
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affine_bportals[pcfg->cpu] = p;
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dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
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return p;
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}
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static int bman_offline_cpu(unsigned int cpu)
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{
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struct bman_portal *p = affine_bportals[cpu];
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const struct bm_portal_config *pcfg;
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if (!p)
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return 0;
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pcfg = bman_get_bm_portal_config(p);
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if (!pcfg)
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return 0;
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/* use any other online CPU */
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cpu = cpumask_any_but(cpu_online_mask, cpu);
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irq_set_affinity(pcfg->irq, cpumask_of(cpu));
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return 0;
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}
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static int bman_online_cpu(unsigned int cpu)
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{
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struct bman_portal *p = affine_bportals[cpu];
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const struct bm_portal_config *pcfg;
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if (!p)
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return 0;
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pcfg = bman_get_bm_portal_config(p);
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if (!pcfg)
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return 0;
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irq_set_affinity(pcfg->irq, cpumask_of(cpu));
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return 0;
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}
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int bman_portals_probed(void)
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{
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return __bman_portals_probed;
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}
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EXPORT_SYMBOL_GPL(bman_portals_probed);
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static int bman_portal_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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struct bm_portal_config *pcfg;
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struct resource *addr_phys[2];
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int irq, cpu, err, i;
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err = bman_is_probed();
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if (!err)
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return -EPROBE_DEFER;
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if (err < 0) {
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dev_err(&pdev->dev, "failing probe due to bman probe error\n");
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return -ENODEV;
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}
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pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
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if (!pcfg) {
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__bman_portals_probed = -1;
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return -ENOMEM;
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}
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pcfg->dev = dev;
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addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
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DPAA_PORTAL_CE);
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if (!addr_phys[0]) {
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dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
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goto err_ioremap1;
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}
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addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
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DPAA_PORTAL_CI);
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if (!addr_phys[1]) {
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dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
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goto err_ioremap1;
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}
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pcfg->cpu = -1;
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irq = platform_get_irq(pdev, 0);
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if (irq <= 0)
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goto err_ioremap1;
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pcfg->irq = irq;
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pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
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resource_size(addr_phys[0]),
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QBMAN_MEMREMAP_ATTR);
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if (!pcfg->addr_virt_ce) {
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dev_err(dev, "memremap::CE failed\n");
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goto err_ioremap1;
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}
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pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
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resource_size(addr_phys[1]));
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if (!pcfg->addr_virt_ci) {
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dev_err(dev, "ioremap::CI failed\n");
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goto err_ioremap2;
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}
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spin_lock(&bman_lock);
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cpu = cpumask_first_zero(&portal_cpus);
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if (cpu >= nr_cpu_ids) {
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__bman_portals_probed = 1;
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/* unassigned portal, skip init */
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spin_unlock(&bman_lock);
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goto check_cleanup;
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}
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cpumask_set_cpu(cpu, &portal_cpus);
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spin_unlock(&bman_lock);
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pcfg->cpu = cpu;
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if (!init_pcfg(pcfg)) {
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dev_err(dev, "portal init failed\n");
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goto err_portal_init;
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}
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/* clear irq affinity if assigned cpu is offline */
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if (!cpu_online(cpu))
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bman_offline_cpu(cpu);
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check_cleanup:
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if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
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/*
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* BMan wasn't reset prior to boot (Kexec for example)
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* Empty all the buffer pools so they are in reset state
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*/
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for (i = 0; i < BM_POOL_MAX; i++) {
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err = bm_shutdown_pool(i);
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if (err) {
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dev_err(dev, "Failed to shutdown bpool %d\n",
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i);
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goto err_portal_init;
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}
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}
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bman_done_cleanup();
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}
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return 0;
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err_portal_init:
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iounmap(pcfg->addr_virt_ci);
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err_ioremap2:
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memunmap(pcfg->addr_virt_ce);
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err_ioremap1:
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__bman_portals_probed = -1;
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return -ENXIO;
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}
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static const struct of_device_id bman_portal_ids[] = {
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{
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.compatible = "fsl,bman-portal",
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},
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{}
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};
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MODULE_DEVICE_TABLE(of, bman_portal_ids);
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static struct platform_driver bman_portal_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = bman_portal_ids,
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},
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.probe = bman_portal_probe,
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};
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static int __init bman_portal_driver_register(struct platform_driver *drv)
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{
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int ret;
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ret = platform_driver_register(drv);
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if (ret < 0)
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return ret;
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ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
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"soc/qbman_portal:online",
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bman_online_cpu, bman_offline_cpu);
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if (ret < 0) {
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pr_err("bman: failed to register hotplug callbacks.\n");
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platform_driver_unregister(drv);
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return ret;
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}
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return 0;
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}
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module_driver(bman_portal_driver,
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bman_portal_driver_register, platform_driver_unregister);
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