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 /* protect bman global registers and global data shared among portals */
36 static DEFINE_SPINLOCK(bman_lock);
37
init_pcfg(struct bm_portal_config * pcfg)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
bman_offline_cpu(unsigned int cpu)56 static void 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;
63
64 pcfg = bman_get_bm_portal_config(p);
65 if (!pcfg)
66 return;
67
68 irq_set_affinity(pcfg->irq, cpumask_of(0));
69 }
70
bman_online_cpu(unsigned int cpu)71 static void bman_online_cpu(unsigned int cpu)
72 {
73 struct bman_portal *p = affine_bportals[cpu];
74 const struct bm_portal_config *pcfg;
75
76 if (!p)
77 return;
78
79 pcfg = bman_get_bm_portal_config(p);
80 if (!pcfg)
81 return;
82
83 irq_set_affinity(pcfg->irq, cpumask_of(cpu));
84 }
85
bman_hotplug_cpu_callback(struct notifier_block * nfb,unsigned long action,void * hcpu)86 static int bman_hotplug_cpu_callback(struct notifier_block *nfb,
87 unsigned long action, void *hcpu)
88 {
89 unsigned int cpu = (unsigned long)hcpu;
90
91 switch (action) {
92 case CPU_ONLINE:
93 case CPU_ONLINE_FROZEN:
94 bman_online_cpu(cpu);
95 break;
96 case CPU_DOWN_PREPARE:
97 case CPU_DOWN_PREPARE_FROZEN:
98 bman_offline_cpu(cpu);
99 }
100
101 return NOTIFY_OK;
102 }
103
104 static struct notifier_block bman_hotplug_cpu_notifier = {
105 .notifier_call = bman_hotplug_cpu_callback,
106 };
107
bman_portal_probe(struct platform_device * pdev)108 static int bman_portal_probe(struct platform_device *pdev)
109 {
110 struct device *dev = &pdev->dev;
111 struct device_node *node = dev->of_node;
112 struct bm_portal_config *pcfg;
113 struct resource *addr_phys[2];
114 void __iomem *va;
115 int irq, cpu;
116
117 pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
118 if (!pcfg)
119 return -ENOMEM;
120
121 pcfg->dev = dev;
122
123 addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
124 DPAA_PORTAL_CE);
125 if (!addr_phys[0]) {
126 dev_err(dev, "Can't get %s property 'reg::CE'\n",
127 node->full_name);
128 return -ENXIO;
129 }
130
131 addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
132 DPAA_PORTAL_CI);
133 if (!addr_phys[1]) {
134 dev_err(dev, "Can't get %s property 'reg::CI'\n",
135 node->full_name);
136 return -ENXIO;
137 }
138
139 pcfg->cpu = -1;
140
141 irq = platform_get_irq(pdev, 0);
142 if (irq <= 0) {
143 dev_err(dev, "Can't get %s IRQ'\n", node->full_name);
144 return -ENXIO;
145 }
146 pcfg->irq = irq;
147
148 va = ioremap_prot(addr_phys[0]->start, resource_size(addr_phys[0]), 0);
149 if (!va)
150 goto err_ioremap1;
151
152 pcfg->addr_virt[DPAA_PORTAL_CE] = va;
153
154 va = ioremap_prot(addr_phys[1]->start, resource_size(addr_phys[1]),
155 _PAGE_GUARDED | _PAGE_NO_CACHE);
156 if (!va)
157 goto err_ioremap2;
158
159 pcfg->addr_virt[DPAA_PORTAL_CI] = va;
160
161 spin_lock(&bman_lock);
162 cpu = cpumask_next_zero(-1, &portal_cpus);
163 if (cpu >= nr_cpu_ids) {
164 /* unassigned portal, skip init */
165 spin_unlock(&bman_lock);
166 return 0;
167 }
168
169 cpumask_set_cpu(cpu, &portal_cpus);
170 spin_unlock(&bman_lock);
171 pcfg->cpu = cpu;
172
173 if (!init_pcfg(pcfg))
174 goto err_ioremap2;
175
176 /* clear irq affinity if assigned cpu is offline */
177 if (!cpu_online(cpu))
178 bman_offline_cpu(cpu);
179
180 return 0;
181
182 err_ioremap2:
183 iounmap(pcfg->addr_virt[DPAA_PORTAL_CE]);
184 err_ioremap1:
185 dev_err(dev, "ioremap failed\n");
186 return -ENXIO;
187 }
188
189 static const struct of_device_id bman_portal_ids[] = {
190 {
191 .compatible = "fsl,bman-portal",
192 },
193 {}
194 };
195 MODULE_DEVICE_TABLE(of, bman_portal_ids);
196
197 static struct platform_driver bman_portal_driver = {
198 .driver = {
199 .name = KBUILD_MODNAME,
200 .of_match_table = bman_portal_ids,
201 },
202 .probe = bman_portal_probe,
203 };
204
bman_portal_driver_register(struct platform_driver * drv)205 static int __init bman_portal_driver_register(struct platform_driver *drv)
206 {
207 int ret;
208
209 ret = platform_driver_register(drv);
210 if (ret < 0)
211 return ret;
212
213 register_hotcpu_notifier(&bman_hotplug_cpu_notifier);
214
215 return 0;
216 }
217
218 module_driver(bman_portal_driver,
219 bman_portal_driver_register, platform_driver_unregister);
220