4d7b9caee1c4719675191b8348099e410a756b3a
[releases.git] / bman_portal.c
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_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
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);