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:
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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
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29  */
30 
31 #include "bman_priv.h"
32 
33 static struct bman_portal *affine_bportals[NR_CPUS];
34 static struct cpumask portal_cpus;
35 /* protect bman global registers and global data shared among portals */
36 static DEFINE_SPINLOCK(bman_lock);
37 
38 static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)
39 {
40 	struct bman_portal *p = bman_create_affine_portal(pcfg);
41 
42 	if (!p) {
43 		dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
44 			 __func__, pcfg->cpu);
45 		return NULL;
46 	}
47 
48 	bman_p_irqsource_add(p, BM_PIRQ_RCRI);
49 	affine_bportals[pcfg->cpu] = p;
50 
51 	dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
52 
53 	return p;
54 }
55 
56 static int bman_offline_cpu(unsigned int cpu)
57 {
58 	struct bman_portal *p = affine_bportals[cpu];
59 	const struct bm_portal_config *pcfg;
60 
61 	if (!p)
62 		return 0;
63 
64 	pcfg = bman_get_bm_portal_config(p);
65 	if (!pcfg)
66 		return 0;
67 
68 	irq_set_affinity(pcfg->irq, cpumask_of(0));
69 	return 0;
70 }
71 
72 static int bman_online_cpu(unsigned int cpu)
73 {
74 	struct bman_portal *p = affine_bportals[cpu];
75 	const struct bm_portal_config *pcfg;
76 
77 	if (!p)
78 		return 0;
79 
80 	pcfg = bman_get_bm_portal_config(p);
81 	if (!pcfg)
82 		return 0;
83 
84 	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
85 	return 0;
86 }
87 
88 static int bman_portal_probe(struct platform_device *pdev)
89 {
90 	struct device *dev = &pdev->dev;
91 	struct device_node *node = dev->of_node;
92 	struct bm_portal_config *pcfg;
93 	struct resource *addr_phys[2];
94 	void __iomem *va;
95 	int irq, cpu;
96 
97 	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
98 	if (!pcfg)
99 		return -ENOMEM;
100 
101 	pcfg->dev = dev;
102 
103 	addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
104 					     DPAA_PORTAL_CE);
105 	if (!addr_phys[0]) {
106 		dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
107 		return -ENXIO;
108 	}
109 
110 	addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
111 					     DPAA_PORTAL_CI);
112 	if (!addr_phys[1]) {
113 		dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
114 		return -ENXIO;
115 	}
116 
117 	pcfg->cpu = -1;
118 
119 	irq = platform_get_irq(pdev, 0);
120 	if (irq <= 0) {
121 		dev_err(dev, "Can't get %pOF IRQ'\n", node);
122 		return -ENXIO;
123 	}
124 	pcfg->irq = irq;
125 
126 	va = ioremap_prot(addr_phys[0]->start, resource_size(addr_phys[0]), 0);
127 	if (!va) {
128 		dev_err(dev, "ioremap::CE failed\n");
129 		goto err_ioremap1;
130 	}
131 
132 	pcfg->addr_virt[DPAA_PORTAL_CE] = va;
133 
134 	va = ioremap_prot(addr_phys[1]->start, resource_size(addr_phys[1]),
135 			  _PAGE_GUARDED | _PAGE_NO_CACHE);
136 	if (!va) {
137 		dev_err(dev, "ioremap::CI failed\n");
138 		goto err_ioremap2;
139 	}
140 
141 	pcfg->addr_virt[DPAA_PORTAL_CI] = va;
142 
143 	spin_lock(&bman_lock);
144 	cpu = cpumask_next_zero(-1, &portal_cpus);
145 	if (cpu >= nr_cpu_ids) {
146 		/* unassigned portal, skip init */
147 		spin_unlock(&bman_lock);
148 		return 0;
149 	}
150 
151 	cpumask_set_cpu(cpu, &portal_cpus);
152 	spin_unlock(&bman_lock);
153 	pcfg->cpu = cpu;
154 
155 	if (!init_pcfg(pcfg)) {
156 		dev_err(dev, "portal init failed\n");
157 		goto err_portal_init;
158 	}
159 
160 	/* clear irq affinity if assigned cpu is offline */
161 	if (!cpu_online(cpu))
162 		bman_offline_cpu(cpu);
163 
164 	return 0;
165 
166 err_portal_init:
167 	iounmap(pcfg->addr_virt[DPAA_PORTAL_CI]);
168 err_ioremap2:
169 	iounmap(pcfg->addr_virt[DPAA_PORTAL_CE]);
170 err_ioremap1:
171 	return -ENXIO;
172 }
173 
174 static const struct of_device_id bman_portal_ids[] = {
175 	{
176 		.compatible = "fsl,bman-portal",
177 	},
178 	{}
179 };
180 MODULE_DEVICE_TABLE(of, bman_portal_ids);
181 
182 static struct platform_driver bman_portal_driver = {
183 	.driver = {
184 		.name = KBUILD_MODNAME,
185 		.of_match_table = bman_portal_ids,
186 	},
187 	.probe = bman_portal_probe,
188 };
189 
190 static int __init bman_portal_driver_register(struct platform_driver *drv)
191 {
192 	int ret;
193 
194 	ret = platform_driver_register(drv);
195 	if (ret < 0)
196 		return ret;
197 
198 	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
199 					"soc/qbman_portal:online",
200 					bman_online_cpu, bman_offline_cpu);
201 	if (ret < 0) {
202 		pr_err("bman: failed to register hotplug callbacks.\n");
203 		platform_driver_unregister(drv);
204 		return ret;
205 	}
206 	return 0;
207 }
208 
209 module_driver(bman_portal_driver,
210 	      bman_portal_driver_register, platform_driver_unregister);
211