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 
33 static struct bman_portal *affine_bportals[NR_CPUS];
34 static struct cpumask portal_cpus;
35 static int __bman_portals_probed;
36 /* protect bman global registers and global data shared among portals */
37 static DEFINE_SPINLOCK(bman_lock);
38 
39 static 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 
57 static 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 
75 static 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 
91 int bman_portals_probed(void)
92 {
93 	return __bman_portals_probed;
94 }
95 EXPORT_SYMBOL_GPL(bman_portals_probed);
96 
97 static 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_next_zero(-1, &portal_cpus);
159 	if (cpu >= nr_cpu_ids) {
160 		__bman_portals_probed = 1;
161 		/* unassigned portal, skip init */
162 		spin_unlock(&bman_lock);
163 		return 0;
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 
179 	if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
180 		/*
181 		 * BMan wasn't reset prior to boot (Kexec for example)
182 		 * Empty all the buffer pools so they are in reset state
183 		 */
184 		for (i = 0; i < BM_POOL_MAX; i++) {
185 			err =  bm_shutdown_pool(i);
186 			if (err) {
187 				dev_err(dev, "Failed to shutdown bpool %d\n",
188 					i);
189 				goto err_portal_init;
190 			}
191 		}
192 		bman_done_cleanup();
193 	}
194 
195 	return 0;
196 
197 err_portal_init:
198 	iounmap(pcfg->addr_virt_ci);
199 err_ioremap2:
200 	memunmap(pcfg->addr_virt_ce);
201 err_ioremap1:
202 	 __bman_portals_probed = -1;
203 
204 	return -ENXIO;
205 }
206 
207 static const struct of_device_id bman_portal_ids[] = {
208 	{
209 		.compatible = "fsl,bman-portal",
210 	},
211 	{}
212 };
213 MODULE_DEVICE_TABLE(of, bman_portal_ids);
214 
215 static struct platform_driver bman_portal_driver = {
216 	.driver = {
217 		.name = KBUILD_MODNAME,
218 		.of_match_table = bman_portal_ids,
219 	},
220 	.probe = bman_portal_probe,
221 };
222 
223 static int __init bman_portal_driver_register(struct platform_driver *drv)
224 {
225 	int ret;
226 
227 	ret = platform_driver_register(drv);
228 	if (ret < 0)
229 		return ret;
230 
231 	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
232 					"soc/qbman_portal:online",
233 					bman_online_cpu, bman_offline_cpu);
234 	if (ret < 0) {
235 		pr_err("bman: failed to register hotplug callbacks.\n");
236 		platform_driver_unregister(drv);
237 		return ret;
238 	}
239 	return 0;
240 }
241 
242 module_driver(bman_portal_driver,
243 	      bman_portal_driver_register, platform_driver_unregister);
244