qman_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 "qman_priv.h"
 32
 33struct qman_portal *qman_dma_portal;
 34EXPORT_SYMBOL(qman_dma_portal);
 35
 36/* Enable portal interupts (as opposed to polling mode) */
 37#define CONFIG_FSL_DPA_PIRQ_SLOW  1
 38#define CONFIG_FSL_DPA_PIRQ_FAST  1
 39
 40static struct cpumask portal_cpus;
 41static int __qman_portals_probed;
 42/* protect qman global registers and global data shared among portals */
 43static DEFINE_SPINLOCK(qman_lock);
 44
 45static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
 46{
 47#ifdef CONFIG_FSL_PAMU
 48	struct device *dev = pcfg->dev;
 49	int ret;
 50
 51	pcfg->iommu_domain = iommu_paging_domain_alloc(dev);
 52	if (IS_ERR(pcfg->iommu_domain)) {
 53		dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
 54		pcfg->iommu_domain = NULL;
 55		goto no_iommu;
 56	}
 57	ret = fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu);
 58	if (ret < 0) {
 59		dev_err(dev, "%s(): fsl_pamu_configure_l1_stash() = %d",
 60			__func__, ret);
 61		goto out_domain_free;
 62	}
 63	ret = iommu_attach_device(pcfg->iommu_domain, dev);
 64	if (ret < 0) {
 65		dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
 66			ret);
 67		goto out_domain_free;
 68	}
 69
 70no_iommu:
 71#endif
 72	qman_set_sdest(pcfg->channel, cpu);
 73
 74	return;
 75
 76#ifdef CONFIG_FSL_PAMU
 77out_domain_free:
 78	iommu_domain_free(pcfg->iommu_domain);
 79	pcfg->iommu_domain = NULL;
 80#endif
 81}
 82
 83static struct qman_portal *init_pcfg(struct qm_portal_config *pcfg)
 84{
 85	struct qman_portal *p;
 86	u32 irq_sources = 0;
 87
 88	/* We need the same LIODN offset for all portals */
 89	qman_liodn_fixup(pcfg->channel);
 90
 91	pcfg->iommu_domain = NULL;
 92	portal_set_cpu(pcfg, pcfg->cpu);
 93
 94	p = qman_create_affine_portal(pcfg, NULL);
 95	if (!p) {
 96		dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
 97			 __func__, pcfg->cpu);
 98		return NULL;
 99	}
100
101	/* Determine what should be interrupt-vs-poll driven */
102#ifdef CONFIG_FSL_DPA_PIRQ_SLOW
103	irq_sources |= QM_PIRQ_EQCI | QM_PIRQ_EQRI | QM_PIRQ_MRI |
104		       QM_PIRQ_CSCI;
105#endif
106#ifdef CONFIG_FSL_DPA_PIRQ_FAST
107	irq_sources |= QM_PIRQ_DQRI;
108#endif
109	qman_p_irqsource_add(p, irq_sources);
110
111	spin_lock(&qman_lock);
112	if (cpumask_equal(&portal_cpus, cpu_possible_mask)) {
113		/* all assigned portals are initialized now */
114		qman_init_cgr_all();
115	}
116
117	if (!qman_dma_portal)
118		qman_dma_portal = p;
119
120	spin_unlock(&qman_lock);
121
122	dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
123
124	return p;
125}
126
127static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
128							unsigned int cpu)
129{
130#ifdef CONFIG_FSL_PAMU /* TODO */
131	if (pcfg->iommu_domain) {
132		if (fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu) < 0) {
133			dev_err(pcfg->dev,
134				"Failed to update pamu stash setting\n");
135			return;
136		}
137	}
138#endif
139	qman_set_sdest(pcfg->channel, cpu);
140}
141
142static int qman_offline_cpu(unsigned int cpu)
143{
144	struct qman_portal *p;
145	const struct qm_portal_config *pcfg;
146
147	p = affine_portals[cpu];
148	if (p) {
149		pcfg = qman_get_qm_portal_config(p);
150		if (pcfg) {
151			/* select any other online CPU */
152			cpu = cpumask_any_but(cpu_online_mask, cpu);
153			irq_set_affinity(pcfg->irq, cpumask_of(cpu));
154			qman_portal_update_sdest(pcfg, cpu);
155		}
156	}
157	return 0;
158}
159
160static int qman_online_cpu(unsigned int cpu)
161{
162	struct qman_portal *p;
163	const struct qm_portal_config *pcfg;
164
165	p = affine_portals[cpu];
166	if (p) {
167		pcfg = qman_get_qm_portal_config(p);
168		if (pcfg) {
169			irq_set_affinity(pcfg->irq, cpumask_of(cpu));
170			qman_portal_update_sdest(pcfg, cpu);
171		}
172	}
173	return 0;
174}
175
176int qman_portals_probed(void)
177{
178	return __qman_portals_probed;
179}
180EXPORT_SYMBOL_GPL(qman_portals_probed);
181
182static int qman_portal_probe(struct platform_device *pdev)
183{
184	struct device *dev = &pdev->dev;
185	struct device_node *node = dev->of_node;
186	struct qm_portal_config *pcfg;
187	struct resource *addr_phys[2];
188	int irq, cpu, err, i;
189	u32 val;
190
191	err = qman_is_probed();
192	if (!err)
193		return -EPROBE_DEFER;
194	if (err < 0) {
195		dev_err(&pdev->dev, "failing probe due to qman probe error\n");
196		return -ENODEV;
197	}
198
199	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
200	if (!pcfg) {
201		__qman_portals_probed = -1;
202		return -ENOMEM;
203	}
204
205	pcfg->dev = dev;
206
207	addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
208					     DPAA_PORTAL_CE);
209	if (!addr_phys[0]) {
210		dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
211		goto err_ioremap1;
212	}
213
214	addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
215					     DPAA_PORTAL_CI);
216	if (!addr_phys[1]) {
217		dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
218		goto err_ioremap1;
219	}
220
221	err = of_property_read_u32(node, "cell-index", &val);
222	if (err) {
223		dev_err(dev, "Can't get %pOF property 'cell-index'\n", node);
224		__qman_portals_probed = -1;
225		return err;
226	}
227	pcfg->channel = val;
228	pcfg->cpu = -1;
229	irq = platform_get_irq(pdev, 0);
230	if (irq <= 0)
231		goto err_ioremap1;
232	pcfg->irq = irq;
233
234	pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
235					resource_size(addr_phys[0]),
236					QBMAN_MEMREMAP_ATTR);
237	if (!pcfg->addr_virt_ce) {
238		dev_err(dev, "memremap::CE failed\n");
239		goto err_ioremap1;
240	}
241
242	pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
243				resource_size(addr_phys[1]));
244	if (!pcfg->addr_virt_ci) {
245		dev_err(dev, "ioremap::CI failed\n");
246		goto err_ioremap2;
247	}
248
249	pcfg->pools = qm_get_pools_sdqcr();
250
251	spin_lock(&qman_lock);
252	cpu = cpumask_first_zero(&portal_cpus);
253	if (cpu >= nr_cpu_ids) {
254		__qman_portals_probed = 1;
255		/* unassigned portal, skip init */
256		spin_unlock(&qman_lock);
257		goto check_cleanup;
258	}
259
260	cpumask_set_cpu(cpu, &portal_cpus);
261	spin_unlock(&qman_lock);
262	pcfg->cpu = cpu;
263
264	if (dma_set_mask(dev, DMA_BIT_MASK(40))) {
265		dev_err(dev, "dma_set_mask() failed\n");
266		goto err_portal_init;
267	}
268
269	if (!init_pcfg(pcfg)) {
270		dev_err(dev, "portal init failed\n");
271		goto err_portal_init;
272	}
273
274	/* clear irq affinity if assigned cpu is offline */
275	if (!cpu_online(cpu))
276		qman_offline_cpu(cpu);
277
278check_cleanup:
279	if (__qman_portals_probed == 1 && qman_requires_cleanup()) {
280		/*
281		 * QMan wasn't reset prior to boot (Kexec for example)
282		 * Empty all the frame queues so they are in reset state
283		 */
284		for (i = 0; i < qm_get_fqid_maxcnt(); i++) {
285			err =  qman_shutdown_fq(i);
286			if (err) {
287				dev_err(dev, "Failed to shutdown frame queue %d\n",
288					i);
289				goto err_portal_init;
290			}
291		}
292		qman_done_cleanup();
293	}
294
295	return 0;
296
297err_portal_init:
298	iounmap(pcfg->addr_virt_ci);
299err_ioremap2:
300	memunmap(pcfg->addr_virt_ce);
301err_ioremap1:
302	__qman_portals_probed = -1;
303
304	return -ENXIO;
305}
306
307static const struct of_device_id qman_portal_ids[] = {
308	{
309		.compatible = "fsl,qman-portal",
310	},
311	{}
312};
313MODULE_DEVICE_TABLE(of, qman_portal_ids);
314
315static struct platform_driver qman_portal_driver = {
316	.driver = {
317		.name = KBUILD_MODNAME,
318		.of_match_table = qman_portal_ids,
319	},
320	.probe = qman_portal_probe,
321};
322
323static int __init qman_portal_driver_register(struct platform_driver *drv)
324{
325	int ret;
326
327	ret = platform_driver_register(drv);
328	if (ret < 0)
329		return ret;
330
331	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
332					"soc/qman_portal:online",
333					qman_online_cpu, qman_offline_cpu);
334	if (ret < 0) {
335		pr_err("qman: failed to register hotplug callbacks.\n");
336		platform_driver_unregister(drv);
337		return ret;
338	}
339	return 0;
340}
341
342module_driver(qman_portal_driver,
343	      qman_portal_driver_register, platform_driver_unregister);