bman_portal.c

  1/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
  2 *
  3 * Redistribution and use in source and binary forms, with or without
  4 * modification, are permitted provided that the following conditions are met:
  5 *     * Redistributions of source code must retain the above copyright
  6 *	 notice, this list of conditions and the following disclaimer.
  7 *     * Redistributions in binary form must reproduce the above copyright
  8 *	 notice, this list of conditions and the following disclaimer in the
  9 *	 documentation and/or other materials provided with the distribution.
 10 *     * Neither the name of Freescale Semiconductor nor the
 11 *	 names of its contributors may be used to endorse or promote products
 12 *	 derived from this software without specific prior written permission.
 13 *
 14 * ALTERNATIVELY, this software may be distributed under the terms of the
 15 * GNU General Public License ("GPL") as published by the Free Software
 16 * Foundation, either version 2 of that License or (at your option) any
 17 * later version.
 18 *
 19 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
 20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 22 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
 23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 29 */
 30
 31#include "bman_priv.h"
 32
 33static struct bman_portal *affine_bportals[NR_CPUS];
 34static struct cpumask portal_cpus;
 35static int __bman_portals_probed;
 36/* protect bman global registers and global data shared among portals */
 37static DEFINE_SPINLOCK(bman_lock);
 38
 39static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)
 40{
 41	struct bman_portal *p = bman_create_affine_portal(pcfg);
 42
 43	if (!p) {
 44		dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
 45			 __func__, pcfg->cpu);
 46		return NULL;
 47	}
 48
 49	bman_p_irqsource_add(p, BM_PIRQ_RCRI);
 50	affine_bportals[pcfg->cpu] = p;
 51
 52	dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
 53
 54	return p;
 55}
 56
 57static int bman_offline_cpu(unsigned int cpu)
 58{
 59	struct bman_portal *p = affine_bportals[cpu];
 60	const struct bm_portal_config *pcfg;
 61
 62	if (!p)
 63		return 0;
 64
 65	pcfg = bman_get_bm_portal_config(p);
 66	if (!pcfg)
 67		return 0;
 68
 69	/* use any other online CPU */
 70	cpu = cpumask_any_but(cpu_online_mask, cpu);
 71	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
 72	return 0;
 73}
 74
 75static int bman_online_cpu(unsigned int cpu)
 76{
 77	struct bman_portal *p = affine_bportals[cpu];
 78	const struct bm_portal_config *pcfg;
 79
 80	if (!p)
 81		return 0;
 82
 83	pcfg = bman_get_bm_portal_config(p);
 84	if (!pcfg)
 85		return 0;
 86
 87	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
 88	return 0;
 89}
 90
 91int bman_portals_probed(void)
 92{
 93	return __bman_portals_probed;
 94}
 95EXPORT_SYMBOL_GPL(bman_portals_probed);
 96
 97static int bman_portal_probe(struct platform_device *pdev)
 98{
 99	struct device *dev = &pdev->dev;
100	struct device_node *node = dev->of_node;
101	struct bm_portal_config *pcfg;
102	struct resource *addr_phys[2];
103	int irq, cpu, err, i;
104
105	err = bman_is_probed();
106	if (!err)
107		return -EPROBE_DEFER;
108	if (err < 0) {
109		dev_err(&pdev->dev, "failing probe due to bman probe error\n");
110		return -ENODEV;
111	}
112
113	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
114	if (!pcfg) {
115		__bman_portals_probed = -1;
116		return -ENOMEM;
117	}
118
119	pcfg->dev = dev;
120
121	addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
122					     DPAA_PORTAL_CE);
123	if (!addr_phys[0]) {
124		dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
125		goto err_ioremap1;
126	}
127
128	addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
129					     DPAA_PORTAL_CI);
130	if (!addr_phys[1]) {
131		dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
132		goto err_ioremap1;
133	}
134
135	pcfg->cpu = -1;
136
137	irq = platform_get_irq(pdev, 0);
138	if (irq <= 0)
139		goto err_ioremap1;
140	pcfg->irq = irq;
141
142	pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
143					resource_size(addr_phys[0]),
144					QBMAN_MEMREMAP_ATTR);
145	if (!pcfg->addr_virt_ce) {
146		dev_err(dev, "memremap::CE failed\n");
147		goto err_ioremap1;
148	}
149
150	pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
151					resource_size(addr_phys[1]));
152	if (!pcfg->addr_virt_ci) {
153		dev_err(dev, "ioremap::CI failed\n");
154		goto err_ioremap2;
155	}
156
157	spin_lock(&bman_lock);
158	cpu = cpumask_first_zero(&portal_cpus);
159	if (cpu >= nr_cpu_ids) {
160		__bman_portals_probed = 1;
161		/* unassigned portal, skip init */
162		spin_unlock(&bman_lock);
163		goto check_cleanup;
164	}
165
166	cpumask_set_cpu(cpu, &portal_cpus);
167	spin_unlock(&bman_lock);
168	pcfg->cpu = cpu;
169
170	if (!init_pcfg(pcfg)) {
171		dev_err(dev, "portal init failed\n");
172		goto err_portal_init;
173	}
174
175	/* clear irq affinity if assigned cpu is offline */
176	if (!cpu_online(cpu))
177		bman_offline_cpu(cpu);
178
179check_cleanup:
180	if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
181		/*
182		 * BMan wasn't reset prior to boot (Kexec for example)
183		 * Empty all the buffer pools so they are in reset state
184		 */
185		for (i = 0; i < BM_POOL_MAX; i++) {
186			err =  bm_shutdown_pool(i);
187			if (err) {
188				dev_err(dev, "Failed to shutdown bpool %d\n",
189					i);
190				goto err_portal_init;
191			}
192		}
193		bman_done_cleanup();
194	}
195
196	return 0;
197
198err_portal_init:
199	iounmap(pcfg->addr_virt_ci);
200err_ioremap2:
201	memunmap(pcfg->addr_virt_ce);
202err_ioremap1:
203	 __bman_portals_probed = -1;
204
205	return -ENXIO;
206}
207
208static const struct of_device_id bman_portal_ids[] = {
209	{
210		.compatible = "fsl,bman-portal",
211	},
212	{}
213};
214MODULE_DEVICE_TABLE(of, bman_portal_ids);
215
216static struct platform_driver bman_portal_driver = {
217	.driver = {
218		.name = KBUILD_MODNAME,
219		.of_match_table = bman_portal_ids,
220	},
221	.probe = bman_portal_probe,
222};
223
224static int __init bman_portal_driver_register(struct platform_driver *drv)
225{
226	int ret;
227
228	ret = platform_driver_register(drv);
229	if (ret < 0)
230		return ret;
231
232	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
233					"soc/qbman_portal:online",
234					bman_online_cpu, bman_offline_cpu);
235	if (ret < 0) {
236		pr_err("bman: failed to register hotplug callbacks.\n");
237		platform_driver_unregister(drv);
238		return ret;
239	}
240	return 0;
241}
242
243module_driver(bman_portal_driver,
244	      bman_portal_driver_register, platform_driver_unregister);