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 
33 struct qman_portal *qman_dma_portal;
34 EXPORT_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 
40 static struct cpumask portal_cpus;
41 static int __qman_portals_probed;
42 /* protect qman global registers and global data shared among portals */
43 static DEFINE_SPINLOCK(qman_lock);
44 
45 static 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 window_count = 1;
50 	struct iommu_domain_geometry geom_attr;
51 	struct pamu_stash_attribute stash_attr;
52 	int ret;
53 
54 	pcfg->iommu_domain = iommu_domain_alloc(&platform_bus_type);
55 	if (!pcfg->iommu_domain) {
56 		dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
57 		goto no_iommu;
58 	}
59 	geom_attr.aperture_start = 0;
60 	geom_attr.aperture_end =
61 		((dma_addr_t)1 << min(8 * sizeof(dma_addr_t), (size_t)36)) - 1;
62 	geom_attr.force_aperture = true;
63 	ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_GEOMETRY,
64 				    &geom_attr);
65 	if (ret < 0) {
66 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
67 			ret);
68 		goto out_domain_free;
69 	}
70 	ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_WINDOWS,
71 				    &window_count);
72 	if (ret < 0) {
73 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
74 			ret);
75 		goto out_domain_free;
76 	}
77 	stash_attr.cpu = cpu;
78 	stash_attr.cache = PAMU_ATTR_CACHE_L1;
79 	ret = iommu_domain_set_attr(pcfg->iommu_domain,
80 				    DOMAIN_ATTR_FSL_PAMU_STASH,
81 				    &stash_attr);
82 	if (ret < 0) {
83 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d",
84 			__func__, ret);
85 		goto out_domain_free;
86 	}
87 	ret = iommu_domain_window_enable(pcfg->iommu_domain, 0, 0, 1ULL << 36,
88 					 IOMMU_READ | IOMMU_WRITE);
89 	if (ret < 0) {
90 		dev_err(dev, "%s(): iommu_domain_window_enable() = %d",
91 			__func__, ret);
92 		goto out_domain_free;
93 	}
94 	ret = iommu_attach_device(pcfg->iommu_domain, dev);
95 	if (ret < 0) {
96 		dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
97 			ret);
98 		goto out_domain_free;
99 	}
100 	ret = iommu_domain_set_attr(pcfg->iommu_domain,
101 				    DOMAIN_ATTR_FSL_PAMU_ENABLE,
102 				    &window_count);
103 	if (ret < 0) {
104 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
105 			ret);
106 		goto out_detach_device;
107 	}
108 
109 no_iommu:
110 #endif
111 	qman_set_sdest(pcfg->channel, cpu);
112 
113 	return;
114 
115 #ifdef CONFIG_FSL_PAMU
116 out_detach_device:
117 	iommu_detach_device(pcfg->iommu_domain, NULL);
118 out_domain_free:
119 	iommu_domain_free(pcfg->iommu_domain);
120 	pcfg->iommu_domain = NULL;
121 #endif
122 }
123 
124 static struct qman_portal *init_pcfg(struct qm_portal_config *pcfg)
125 {
126 	struct qman_portal *p;
127 	u32 irq_sources = 0;
128 
129 	/* We need the same LIODN offset for all portals */
130 	qman_liodn_fixup(pcfg->channel);
131 
132 	pcfg->iommu_domain = NULL;
133 	portal_set_cpu(pcfg, pcfg->cpu);
134 
135 	p = qman_create_affine_portal(pcfg, NULL);
136 	if (!p) {
137 		dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
138 			 __func__, pcfg->cpu);
139 		return NULL;
140 	}
141 
142 	/* Determine what should be interrupt-vs-poll driven */
143 #ifdef CONFIG_FSL_DPA_PIRQ_SLOW
144 	irq_sources |= QM_PIRQ_EQCI | QM_PIRQ_EQRI | QM_PIRQ_MRI |
145 		       QM_PIRQ_CSCI;
146 #endif
147 #ifdef CONFIG_FSL_DPA_PIRQ_FAST
148 	irq_sources |= QM_PIRQ_DQRI;
149 #endif
150 	qman_p_irqsource_add(p, irq_sources);
151 
152 	spin_lock(&qman_lock);
153 	if (cpumask_equal(&portal_cpus, cpu_possible_mask)) {
154 		/* all assigned portals are initialized now */
155 		qman_init_cgr_all();
156 	}
157 
158 	if (!qman_dma_portal)
159 		qman_dma_portal = p;
160 
161 	spin_unlock(&qman_lock);
162 
163 	dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
164 
165 	return p;
166 }
167 
168 static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
169 							unsigned int cpu)
170 {
171 #ifdef CONFIG_FSL_PAMU /* TODO */
172 	struct pamu_stash_attribute stash_attr;
173 	int ret;
174 
175 	if (pcfg->iommu_domain) {
176 		stash_attr.cpu = cpu;
177 		stash_attr.cache = PAMU_ATTR_CACHE_L1;
178 		ret = iommu_domain_set_attr(pcfg->iommu_domain,
179 				DOMAIN_ATTR_FSL_PAMU_STASH, &stash_attr);
180 		if (ret < 0) {
181 			dev_err(pcfg->dev,
182 				"Failed to update pamu stash setting\n");
183 			return;
184 		}
185 	}
186 #endif
187 	qman_set_sdest(pcfg->channel, cpu);
188 }
189 
190 static int qman_offline_cpu(unsigned int cpu)
191 {
192 	struct qman_portal *p;
193 	const struct qm_portal_config *pcfg;
194 
195 	p = affine_portals[cpu];
196 	if (p) {
197 		pcfg = qman_get_qm_portal_config(p);
198 		if (pcfg) {
199 			/* select any other online CPU */
200 			cpu = cpumask_any_but(cpu_online_mask, cpu);
201 			irq_set_affinity(pcfg->irq, cpumask_of(cpu));
202 			qman_portal_update_sdest(pcfg, cpu);
203 		}
204 	}
205 	return 0;
206 }
207 
208 static int qman_online_cpu(unsigned int cpu)
209 {
210 	struct qman_portal *p;
211 	const struct qm_portal_config *pcfg;
212 
213 	p = affine_portals[cpu];
214 	if (p) {
215 		pcfg = qman_get_qm_portal_config(p);
216 		if (pcfg) {
217 			irq_set_affinity(pcfg->irq, cpumask_of(cpu));
218 			qman_portal_update_sdest(pcfg, cpu);
219 		}
220 	}
221 	return 0;
222 }
223 
224 int qman_portals_probed(void)
225 {
226 	return __qman_portals_probed;
227 }
228 EXPORT_SYMBOL_GPL(qman_portals_probed);
229 
230 static int qman_portal_probe(struct platform_device *pdev)
231 {
232 	struct device *dev = &pdev->dev;
233 	struct device_node *node = dev->of_node;
234 	struct qm_portal_config *pcfg;
235 	struct resource *addr_phys[2];
236 	int irq, cpu, err, i;
237 	u32 val;
238 
239 	err = qman_is_probed();
240 	if (!err)
241 		return -EPROBE_DEFER;
242 	if (err < 0) {
243 		dev_err(&pdev->dev, "failing probe due to qman probe error\n");
244 		return -ENODEV;
245 	}
246 
247 	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
248 	if (!pcfg) {
249 		__qman_portals_probed = -1;
250 		return -ENOMEM;
251 	}
252 
253 	pcfg->dev = dev;
254 
255 	addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
256 					     DPAA_PORTAL_CE);
257 	if (!addr_phys[0]) {
258 		dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
259 		goto err_ioremap1;
260 	}
261 
262 	addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
263 					     DPAA_PORTAL_CI);
264 	if (!addr_phys[1]) {
265 		dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
266 		goto err_ioremap1;
267 	}
268 
269 	err = of_property_read_u32(node, "cell-index", &val);
270 	if (err) {
271 		dev_err(dev, "Can't get %pOF property 'cell-index'\n", node);
272 		__qman_portals_probed = -1;
273 		return err;
274 	}
275 	pcfg->channel = val;
276 	pcfg->cpu = -1;
277 	irq = platform_get_irq(pdev, 0);
278 	if (irq <= 0)
279 		goto err_ioremap1;
280 	pcfg->irq = irq;
281 
282 	pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
283 					resource_size(addr_phys[0]),
284 					QBMAN_MEMREMAP_ATTR);
285 	if (!pcfg->addr_virt_ce) {
286 		dev_err(dev, "memremap::CE failed\n");
287 		goto err_ioremap1;
288 	}
289 
290 	pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
291 				resource_size(addr_phys[1]));
292 	if (!pcfg->addr_virt_ci) {
293 		dev_err(dev, "ioremap::CI failed\n");
294 		goto err_ioremap2;
295 	}
296 
297 	pcfg->pools = qm_get_pools_sdqcr();
298 
299 	spin_lock(&qman_lock);
300 	cpu = cpumask_next_zero(-1, &portal_cpus);
301 	if (cpu >= nr_cpu_ids) {
302 		__qman_portals_probed = 1;
303 		/* unassigned portal, skip init */
304 		spin_unlock(&qman_lock);
305 		return 0;
306 	}
307 
308 	cpumask_set_cpu(cpu, &portal_cpus);
309 	spin_unlock(&qman_lock);
310 	pcfg->cpu = cpu;
311 
312 	if (dma_set_mask(dev, DMA_BIT_MASK(40))) {
313 		dev_err(dev, "dma_set_mask() failed\n");
314 		goto err_portal_init;
315 	}
316 
317 	if (!init_pcfg(pcfg)) {
318 		dev_err(dev, "portal init failed\n");
319 		goto err_portal_init;
320 	}
321 
322 	/* clear irq affinity if assigned cpu is offline */
323 	if (!cpu_online(cpu))
324 		qman_offline_cpu(cpu);
325 
326 	if (__qman_portals_probed == 1 && qman_requires_cleanup()) {
327 		/*
328 		 * QMan wasn't reset prior to boot (Kexec for example)
329 		 * Empty all the frame queues so they are in reset state
330 		 */
331 		for (i = 0; i < qm_get_fqid_maxcnt(); i++) {
332 			err =  qman_shutdown_fq(i);
333 			if (err) {
334 				dev_err(dev, "Failed to shutdown frame queue %d\n",
335 					i);
336 				goto err_portal_init;
337 			}
338 		}
339 		qman_done_cleanup();
340 	}
341 
342 	return 0;
343 
344 err_portal_init:
345 	iounmap(pcfg->addr_virt_ci);
346 err_ioremap2:
347 	memunmap(pcfg->addr_virt_ce);
348 err_ioremap1:
349 	__qman_portals_probed = -1;
350 
351 	return -ENXIO;
352 }
353 
354 static const struct of_device_id qman_portal_ids[] = {
355 	{
356 		.compatible = "fsl,qman-portal",
357 	},
358 	{}
359 };
360 MODULE_DEVICE_TABLE(of, qman_portal_ids);
361 
362 static struct platform_driver qman_portal_driver = {
363 	.driver = {
364 		.name = KBUILD_MODNAME,
365 		.of_match_table = qman_portal_ids,
366 	},
367 	.probe = qman_portal_probe,
368 };
369 
370 static int __init qman_portal_driver_register(struct platform_driver *drv)
371 {
372 	int ret;
373 
374 	ret = platform_driver_register(drv);
375 	if (ret < 0)
376 		return ret;
377 
378 	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
379 					"soc/qman_portal:online",
380 					qman_online_cpu, qman_offline_cpu);
381 	if (ret < 0) {
382 		pr_err("qman: failed to register hotplug callbacks.\n");
383 		platform_driver_unregister(drv);
384 		return ret;
385 	}
386 	return 0;
387 }
388 
389 module_driver(qman_portal_driver,
390 	      qman_portal_driver_register, platform_driver_unregister);
391