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/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Freescale Semiconductor nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation, either version 2 of that License or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "bman_priv.h"
static struct bman_portal *affine_bportals[NR_CPUS];
static struct cpumask portal_cpus;
static int __bman_portals_probed;
/* protect bman global registers and global data shared among portals */
static DEFINE_SPINLOCK(bman_lock);
static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)
{
struct bman_portal *p = bman_create_affine_portal(pcfg);
if (!p) {
dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
__func__, pcfg->cpu);
return NULL;
}
bman_p_irqsource_add(p, BM_PIRQ_RCRI);
affine_bportals[pcfg->cpu] = p;
dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
return p;
}
static int bman_offline_cpu(unsigned int cpu)
{
struct bman_portal *p = affine_bportals[cpu];
const struct bm_portal_config *pcfg;
if (!p)
return 0;
pcfg = bman_get_bm_portal_config(p);
if (!pcfg)
return 0;
/* use any other online CPU */
cpu = cpumask_any_but(cpu_online_mask, cpu);
irq_set_affinity(pcfg->irq, cpumask_of(cpu));
return 0;
}
static int bman_online_cpu(unsigned int cpu)
{
struct bman_portal *p = affine_bportals[cpu];
const struct bm_portal_config *pcfg;
if (!p)
return 0;
pcfg = bman_get_bm_portal_config(p);
if (!pcfg)
return 0;
irq_set_affinity(pcfg->irq, cpumask_of(cpu));
return 0;
}
int bman_portals_probed(void)
{
return __bman_portals_probed;
}
EXPORT_SYMBOL_GPL(bman_portals_probed);
static int bman_portal_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
struct bm_portal_config *pcfg;
struct resource *addr_phys[2];
int irq, cpu, err, i;
err = bman_is_probed();
if (!err)
return -EPROBE_DEFER;
if (err < 0) {
dev_err(&pdev->dev, "failing probe due to bman probe error\n");
return -ENODEV;
}
pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
if (!pcfg) {
__bman_portals_probed = -1;
return -ENOMEM;
}
pcfg->dev = dev;
addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
DPAA_PORTAL_CE);
if (!addr_phys[0]) {
dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
goto err_ioremap1;
}
addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
DPAA_PORTAL_CI);
if (!addr_phys[1]) {
dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
goto err_ioremap1;
}
pcfg->cpu = -1;
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
goto err_ioremap1;
pcfg->irq = irq;
pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
resource_size(addr_phys[0]),
QBMAN_MEMREMAP_ATTR);
if (!pcfg->addr_virt_ce) {
dev_err(dev, "memremap::CE failed\n");
goto err_ioremap1;
}
pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
resource_size(addr_phys[1]));
if (!pcfg->addr_virt_ci) {
dev_err(dev, "ioremap::CI failed\n");
goto err_ioremap2;
}
spin_lock(&bman_lock);
cpu = cpumask_next_zero(-1, &portal_cpus);
if (cpu >= nr_cpu_ids) {
__bman_portals_probed = 1;
/* unassigned portal, skip init */
spin_unlock(&bman_lock);
return 0;
}
cpumask_set_cpu(cpu, &portal_cpus);
spin_unlock(&bman_lock);
pcfg->cpu = cpu;
if (!init_pcfg(pcfg)) {
dev_err(dev, "portal init failed\n");
goto err_portal_init;
}
/* clear irq affinity if assigned cpu is offline */
if (!cpu_online(cpu))
bman_offline_cpu(cpu);
if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
/*
* BMan wasn't reset prior to boot (Kexec for example)
* Empty all the buffer pools so they are in reset state
*/
for (i = 0; i < BM_POOL_MAX; i++) {
err = bm_shutdown_pool(i);
if (err) {
dev_err(dev, "Failed to shutdown bpool %d\n",
i);
goto err_portal_init;
}
}
bman_done_cleanup();
}
return 0;
err_portal_init:
iounmap(pcfg->addr_virt_ci);
err_ioremap2:
memunmap(pcfg->addr_virt_ce);
err_ioremap1:
__bman_portals_probed = -1;
return -ENXIO;
}
static const struct of_device_id bman_portal_ids[] = {
{
.compatible = "fsl,bman-portal",
},
{}
};
MODULE_DEVICE_TABLE(of, bman_portal_ids);
static struct platform_driver bman_portal_driver = {
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = bman_portal_ids,
},
.probe = bman_portal_probe,
};
static int __init bman_portal_driver_register(struct platform_driver *drv)
{
int ret;
ret = platform_driver_register(drv);
if (ret < 0)
return ret;
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"soc/qbman_portal:online",
bman_online_cpu, bman_offline_cpu);
if (ret < 0) {
pr_err("bman: failed to register hotplug callbacks.\n");
platform_driver_unregister(drv);
return ret;
}
return 0;
}
module_driver(bman_portal_driver,
bman_portal_driver_register, platform_driver_unregister);
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