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