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
init_pcfg(struct bm_portal_config * pcfg)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
bman_offline_cpu(unsigned int cpu)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
bman_online_cpu(unsigned int cpu)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
bman_portals_probed(void)91 int bman_portals_probed(void)
92 {
93 return __bman_portals_probed;
94 }
95 EXPORT_SYMBOL_GPL(bman_portals_probed);
96
bman_portal_probe(struct platform_device * pdev)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_first_zero(&portal_cpus);
159 if (cpu >= nr_cpu_ids) {
160 __bman_portals_probed = 1;
161 /* unassigned portal, skip init */
162 spin_unlock(&bman_lock);
163 goto check_cleanup;
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 check_cleanup:
180 if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
181 /*
182 * BMan wasn't reset prior to boot (Kexec for example)
183 * Empty all the buffer pools so they are in reset state
184 */
185 for (i = 0; i < BM_POOL_MAX; i++) {
186 err = bm_shutdown_pool(i);
187 if (err) {
188 dev_err(dev, "Failed to shutdown bpool %d\n",
189 i);
190 goto err_portal_init;
191 }
192 }
193 bman_done_cleanup();
194 }
195
196 return 0;
197
198 err_portal_init:
199 iounmap(pcfg->addr_virt_ci);
200 err_ioremap2:
201 memunmap(pcfg->addr_virt_ce);
202 err_ioremap1:
203 __bman_portals_probed = -1;
204
205 return -ENXIO;
206 }
207
208 static const struct of_device_id bman_portal_ids[] = {
209 {
210 .compatible = "fsl,bman-portal",
211 },
212 {}
213 };
214 MODULE_DEVICE_TABLE(of, bman_portal_ids);
215
216 static struct platform_driver bman_portal_driver = {
217 .driver = {
218 .name = KBUILD_MODNAME,
219 .of_match_table = bman_portal_ids,
220 },
221 .probe = bman_portal_probe,
222 };
223
bman_portal_driver_register(struct platform_driver * drv)224 static int __init bman_portal_driver_register(struct platform_driver *drv)
225 {
226 int ret;
227
228 ret = platform_driver_register(drv);
229 if (ret < 0)
230 return ret;
231
232 ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
233 "soc/qbman_portal:online",
234 bman_online_cpu, bman_offline_cpu);
235 if (ret < 0) {
236 pr_err("bman: failed to register hotplug callbacks.\n");
237 platform_driver_unregister(drv);
238 return ret;
239 }
240 return 0;
241 }
242
243 module_driver(bman_portal_driver,
244 bman_portal_driver_register, platform_driver_unregister);
245