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 "qman_priv.h"
32
33struct qman_portal *qman_dma_portal;
34EXPORT_SYMBOL(qman_dma_portal);
35
36/* Enable portal interupts (as opposed to polling mode) */
37#define CONFIG_FSL_DPA_PIRQ_SLOW 1
38#define CONFIG_FSL_DPA_PIRQ_FAST 1
39
40static struct cpumask portal_cpus;
41static int __qman_portals_probed;
42/* protect qman global registers and global data shared among portals */
43static DEFINE_SPINLOCK(qman_lock);
44
45static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
46{
47#ifdef CONFIG_FSL_PAMU
48 struct device *dev = pcfg->dev;
49 int ret;
50
51 pcfg->iommu_domain = iommu_domain_alloc(&platform_bus_type);
52 if (!pcfg->iommu_domain) {
53 dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
54 goto no_iommu;
55 }
56 ret = fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu);
57 if (ret < 0) {
58 dev_err(dev, "%s(): fsl_pamu_configure_l1_stash() = %d",
59 __func__, ret);
60 goto out_domain_free;
61 }
62 ret = iommu_attach_device(pcfg->iommu_domain, dev);
63 if (ret < 0) {
64 dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
65 ret);
66 goto out_domain_free;
67 }
68
69no_iommu:
70#endif
71 qman_set_sdest(channel: pcfg->channel, cpu_idx: cpu);
72
73 return;
74
75#ifdef CONFIG_FSL_PAMU
76out_domain_free:
77 iommu_domain_free(pcfg->iommu_domain);
78 pcfg->iommu_domain = NULL;
79#endif
80}
81
82static struct qman_portal *init_pcfg(struct qm_portal_config *pcfg)
83{
84 struct qman_portal *p;
85 u32 irq_sources = 0;
86
87 /* We need the same LIODN offset for all portals */
88 qman_liodn_fixup(channel: pcfg->channel);
89
90 pcfg->iommu_domain = NULL;
91 portal_set_cpu(pcfg, cpu: pcfg->cpu);
92
93 p = qman_create_affine_portal(config: pcfg, NULL);
94 if (!p) {
95 dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
96 __func__, pcfg->cpu);
97 return NULL;
98 }
99
100 /* Determine what should be interrupt-vs-poll driven */
101#ifdef CONFIG_FSL_DPA_PIRQ_SLOW
102 irq_sources |= QM_PIRQ_EQCI | QM_PIRQ_EQRI | QM_PIRQ_MRI |
103 QM_PIRQ_CSCI;
104#endif
105#ifdef CONFIG_FSL_DPA_PIRQ_FAST
106 irq_sources |= QM_PIRQ_DQRI;
107#endif
108 qman_p_irqsource_add(p, bits: irq_sources);
109
110 spin_lock(lock: &qman_lock);
111 if (cpumask_equal(src1p: &portal_cpus, cpu_possible_mask)) {
112 /* all assigned portals are initialized now */
113 qman_init_cgr_all();
114 }
115
116 if (!qman_dma_portal)
117 qman_dma_portal = p;
118
119 spin_unlock(lock: &qman_lock);
120
121 dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
122
123 return p;
124}
125
126static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
127 unsigned int cpu)
128{
129#ifdef CONFIG_FSL_PAMU /* TODO */
130 if (pcfg->iommu_domain) {
131 if (fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu) < 0) {
132 dev_err(pcfg->dev,
133 "Failed to update pamu stash setting\n");
134 return;
135 }
136 }
137#endif
138 qman_set_sdest(channel: pcfg->channel, cpu_idx: cpu);
139}
140
141static int qman_offline_cpu(unsigned int cpu)
142{
143 struct qman_portal *p;
144 const struct qm_portal_config *pcfg;
145
146 p = affine_portals[cpu];
147 if (p) {
148 pcfg = qman_get_qm_portal_config(portal: p);
149 if (pcfg) {
150 /* select any other online CPU */
151 cpu = cpumask_any_but(cpu_online_mask, cpu);
152 irq_set_affinity(irq: pcfg->irq, cpumask_of(cpu));
153 qman_portal_update_sdest(pcfg, cpu);
154 }
155 }
156 return 0;
157}
158
159static int qman_online_cpu(unsigned int cpu)
160{
161 struct qman_portal *p;
162 const struct qm_portal_config *pcfg;
163
164 p = affine_portals[cpu];
165 if (p) {
166 pcfg = qman_get_qm_portal_config(portal: p);
167 if (pcfg) {
168 irq_set_affinity(irq: pcfg->irq, cpumask_of(cpu));
169 qman_portal_update_sdest(pcfg, cpu);
170 }
171 }
172 return 0;
173}
174
175int qman_portals_probed(void)
176{
177 return __qman_portals_probed;
178}
179EXPORT_SYMBOL_GPL(qman_portals_probed);
180
181static int qman_portal_probe(struct platform_device *pdev)
182{
183 struct device *dev = &pdev->dev;
184 struct device_node *node = dev->of_node;
185 struct qm_portal_config *pcfg;
186 struct resource *addr_phys[2];
187 int irq, cpu, err, i;
188 u32 val;
189
190 err = qman_is_probed();
191 if (!err)
192 return -EPROBE_DEFER;
193 if (err < 0) {
194 dev_err(&pdev->dev, "failing probe due to qman probe error\n");
195 return -ENODEV;
196 }
197
198 pcfg = devm_kmalloc(dev, size: sizeof(*pcfg), GFP_KERNEL);
199 if (!pcfg) {
200 __qman_portals_probed = -1;
201 return -ENOMEM;
202 }
203
204 pcfg->dev = dev;
205
206 addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
207 DPAA_PORTAL_CE);
208 if (!addr_phys[0]) {
209 dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
210 goto err_ioremap1;
211 }
212
213 addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
214 DPAA_PORTAL_CI);
215 if (!addr_phys[1]) {
216 dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
217 goto err_ioremap1;
218 }
219
220 err = of_property_read_u32(np: node, propname: "cell-index", out_value: &val);
221 if (err) {
222 dev_err(dev, "Can't get %pOF property 'cell-index'\n", node);
223 __qman_portals_probed = -1;
224 return err;
225 }
226 pcfg->channel = val;
227 pcfg->cpu = -1;
228 irq = platform_get_irq(pdev, 0);
229 if (irq <= 0)
230 goto err_ioremap1;
231 pcfg->irq = irq;
232
233 pcfg->addr_virt_ce = memremap(offset: addr_phys[0]->start,
234 size: resource_size(res: addr_phys[0]),
235 QBMAN_MEMREMAP_ATTR);
236 if (!pcfg->addr_virt_ce) {
237 dev_err(dev, "memremap::CE failed\n");
238 goto err_ioremap1;
239 }
240
241 pcfg->addr_virt_ci = ioremap(offset: addr_phys[1]->start,
242 size: resource_size(res: addr_phys[1]));
243 if (!pcfg->addr_virt_ci) {
244 dev_err(dev, "ioremap::CI failed\n");
245 goto err_ioremap2;
246 }
247
248 pcfg->pools = qm_get_pools_sdqcr();
249
250 spin_lock(lock: &qman_lock);
251 cpu = cpumask_first_zero(srcp: &portal_cpus);
252 if (cpu >= nr_cpu_ids) {
253 __qman_portals_probed = 1;
254 /* unassigned portal, skip init */
255 spin_unlock(lock: &qman_lock);
256 goto check_cleanup;
257 }
258
259 cpumask_set_cpu(cpu, dstp: &portal_cpus);
260 spin_unlock(lock: &qman_lock);
261 pcfg->cpu = cpu;
262
263 if (dma_set_mask(dev, DMA_BIT_MASK(40))) {
264 dev_err(dev, "dma_set_mask() failed\n");
265 goto err_portal_init;
266 }
267
268 if (!init_pcfg(pcfg)) {
269 dev_err(dev, "portal init failed\n");
270 goto err_portal_init;
271 }
272
273 /* clear irq affinity if assigned cpu is offline */
274 if (!cpu_online(cpu))
275 qman_offline_cpu(cpu);
276
277check_cleanup:
278 if (__qman_portals_probed == 1 && qman_requires_cleanup()) {
279 /*
280 * QMan wasn't reset prior to boot (Kexec for example)
281 * Empty all the frame queues so they are in reset state
282 */
283 for (i = 0; i < qm_get_fqid_maxcnt(); i++) {
284 err = qman_shutdown_fq(fqid: i);
285 if (err) {
286 dev_err(dev, "Failed to shutdown frame queue %d\n",
287 i);
288 goto err_portal_init;
289 }
290 }
291 qman_done_cleanup();
292 }
293
294 return 0;
295
296err_portal_init:
297 iounmap(addr: pcfg->addr_virt_ci);
298err_ioremap2:
299 memunmap(addr: pcfg->addr_virt_ce);
300err_ioremap1:
301 __qman_portals_probed = -1;
302
303 return -ENXIO;
304}
305
306static const struct of_device_id qman_portal_ids[] = {
307 {
308 .compatible = "fsl,qman-portal",
309 },
310 {}
311};
312MODULE_DEVICE_TABLE(of, qman_portal_ids);
313
314static struct platform_driver qman_portal_driver = {
315 .driver = {
316 .name = KBUILD_MODNAME,
317 .of_match_table = qman_portal_ids,
318 },
319 .probe = qman_portal_probe,
320};
321
322static int __init qman_portal_driver_register(struct platform_driver *drv)
323{
324 int ret;
325
326 ret = platform_driver_register(drv);
327 if (ret < 0)
328 return ret;
329
330 ret = cpuhp_setup_state_nocalls(state: CPUHP_AP_ONLINE_DYN,
331 name: "soc/qman_portal:online",
332 startup: qman_online_cpu, teardown: qman_offline_cpu);
333 if (ret < 0) {
334 pr_err("qman: failed to register hotplug callbacks.\n");
335 platform_driver_unregister(drv);
336 return ret;
337 }
338 return 0;
339}
340
341module_driver(qman_portal_driver,
342 qman_portal_driver_register, platform_driver_unregister);
343

source code of linux/drivers/soc/fsl/qbman/qman_portal.c