tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
33static struct bman_portal *affine_bportals[NR_CPUS];
34static struct cpumask portal_cpus;
35/* protect bman global registers and global data shared among portals */
36static DEFINE_SPINLOCK(bman_lock);
37
38static 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
56static 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
72static 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
88static 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 int irq, cpu;
95
96 pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
97 if (!pcfg)
98 return -ENOMEM;
99
100 pcfg->dev = dev;
101
102 addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
103 DPAA_PORTAL_CE);
104 if (!addr_phys[0]) {
105 dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
106 return -ENXIO;
107 }
108
109 addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
110 DPAA_PORTAL_CI);
111 if (!addr_phys[1]) {
112 dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
113 return -ENXIO;
114 }
115
116 pcfg->cpu = -1;
117
118 irq = platform_get_irq(pdev, 0);
119 if (irq <= 0) {
120 dev_err(dev, "Can't get %pOF IRQ'\n", node);
121 return -ENXIO;
122 }
123 pcfg->irq = irq;
124
125 pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
126 resource_size(addr_phys[0]),
127 QBMAN_MEMREMAP_ATTR);
128 if (!pcfg->addr_virt_ce) {
129 dev_err(dev, "memremap::CE failed\n");
130 goto err_ioremap1;
131 }
132
133 pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
134 resource_size(addr_phys[1]));
135 if (!pcfg->addr_virt_ci) {
136 dev_err(dev, "ioremap::CI failed\n");
137 goto err_ioremap2;
138 }
139
140 spin_lock(&bman_lock);
141 cpu = cpumask_next_zero(-1, &portal_cpus);
142 if (cpu >= nr_cpu_ids) {
143 /* unassigned portal, skip init */
144 spin_unlock(&bman_lock);
145 return 0;
146 }
147
148 cpumask_set_cpu(cpu, &portal_cpus);
149 spin_unlock(&bman_lock);
150 pcfg->cpu = cpu;
151
152 if (!init_pcfg(pcfg)) {
153 dev_err(dev, "portal init failed\n");
154 goto err_portal_init;
155 }
156
157 /* clear irq affinity if assigned cpu is offline */
158 if (!cpu_online(cpu))
159 bman_offline_cpu(cpu);
160
161 return 0;
162
163err_portal_init:
164 iounmap(pcfg->addr_virt_ci);
165err_ioremap2:
166 memunmap(pcfg->addr_virt_ce);
167err_ioremap1:
168 return -ENXIO;
169}
170
171static const struct of_device_id bman_portal_ids[] = {
172 {
173 .compatible = "fsl,bman-portal",
174 },
175 {}
176};
177MODULE_DEVICE_TABLE(of, bman_portal_ids);
178
179static struct platform_driver bman_portal_driver = {
180 .driver = {
181 .name = KBUILD_MODNAME,
182 .of_match_table = bman_portal_ids,
183 },
184 .probe = bman_portal_probe,
185};
186
187static int __init bman_portal_driver_register(struct platform_driver *drv)
188{
189 int ret;
190
191 ret = platform_driver_register(drv);
192 if (ret < 0)
193 return ret;
194
195 ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
196 "soc/qbman_portal:online",
197 bman_online_cpu, bman_offline_cpu);
198 if (ret < 0) {
199 pr_err("bman: failed to register hotplug callbacks.\n");
200 platform_driver_unregister(drv);
201 return ret;
202 }
203 return 0;
204}
205
206module_driver(bman_portal_driver,
207 bman_portal_driver_register, platform_driver_unregister);