1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
2 /*
3 * Copyright 2013-2016 Freescale Semiconductor Inc.
4 *
5 */
6
7 #include <linux/io.h>
8 #include <linux/fsl/mc.h>
9
10 #include "fsl-mc-private.h"
11
fsl_mc_io_set_dpmcp(struct fsl_mc_io * mc_io,struct fsl_mc_device * dpmcp_dev)12 static int fsl_mc_io_set_dpmcp(struct fsl_mc_io *mc_io,
13 struct fsl_mc_device *dpmcp_dev)
14 {
15 int error;
16
17 if (mc_io->dpmcp_dev)
18 return -EINVAL;
19
20 if (dpmcp_dev->mc_io)
21 return -EINVAL;
22
23 error = dpmcp_open(mc_io,
24 0,
25 dpmcp_dev->obj_desc.id,
26 &dpmcp_dev->mc_handle);
27 if (error < 0)
28 return error;
29
30 mc_io->dpmcp_dev = dpmcp_dev;
31 dpmcp_dev->mc_io = mc_io;
32 return 0;
33 }
34
fsl_mc_io_unset_dpmcp(struct fsl_mc_io * mc_io)35 static void fsl_mc_io_unset_dpmcp(struct fsl_mc_io *mc_io)
36 {
37 int error;
38 struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
39
40 error = dpmcp_close(mc_io,
41 0,
42 dpmcp_dev->mc_handle);
43 if (error < 0) {
44 dev_err(&dpmcp_dev->dev, "dpmcp_close() failed: %d\n",
45 error);
46 }
47
48 mc_io->dpmcp_dev = NULL;
49 dpmcp_dev->mc_io = NULL;
50 }
51
52 /**
53 * Creates an MC I/O object
54 *
55 * @dev: device to be associated with the MC I/O object
56 * @mc_portal_phys_addr: physical address of the MC portal to use
57 * @mc_portal_size: size in bytes of the MC portal
58 * @dpmcp-dev: Pointer to the DPMCP object associated with this MC I/O
59 * object or NULL if none.
60 * @flags: flags for the new MC I/O object
61 * @new_mc_io: Area to return pointer to newly created MC I/O object
62 *
63 * Returns '0' on Success; Error code otherwise.
64 */
fsl_create_mc_io(struct device * dev,phys_addr_t mc_portal_phys_addr,u32 mc_portal_size,struct fsl_mc_device * dpmcp_dev,u32 flags,struct fsl_mc_io ** new_mc_io)65 int __must_check fsl_create_mc_io(struct device *dev,
66 phys_addr_t mc_portal_phys_addr,
67 u32 mc_portal_size,
68 struct fsl_mc_device *dpmcp_dev,
69 u32 flags, struct fsl_mc_io **new_mc_io)
70 {
71 int error;
72 struct fsl_mc_io *mc_io;
73 void __iomem *mc_portal_virt_addr;
74 struct resource *res;
75
76 mc_io = devm_kzalloc(dev, sizeof(*mc_io), GFP_KERNEL);
77 if (!mc_io)
78 return -ENOMEM;
79
80 mc_io->dev = dev;
81 mc_io->flags = flags;
82 mc_io->portal_phys_addr = mc_portal_phys_addr;
83 mc_io->portal_size = mc_portal_size;
84 if (flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
85 raw_spin_lock_init(&mc_io->spinlock);
86 else
87 mutex_init(&mc_io->mutex);
88
89 res = devm_request_mem_region(dev,
90 mc_portal_phys_addr,
91 mc_portal_size,
92 "mc_portal");
93 if (!res) {
94 dev_err(dev,
95 "devm_request_mem_region failed for MC portal %pa\n",
96 &mc_portal_phys_addr);
97 return -EBUSY;
98 }
99
100 mc_portal_virt_addr = devm_ioremap(dev,
101 mc_portal_phys_addr,
102 mc_portal_size);
103 if (!mc_portal_virt_addr) {
104 dev_err(dev,
105 "devm_ioremap failed for MC portal %pa\n",
106 &mc_portal_phys_addr);
107 return -ENXIO;
108 }
109
110 mc_io->portal_virt_addr = mc_portal_virt_addr;
111 if (dpmcp_dev) {
112 error = fsl_mc_io_set_dpmcp(mc_io, dpmcp_dev);
113 if (error < 0)
114 goto error_destroy_mc_io;
115 }
116
117 *new_mc_io = mc_io;
118 return 0;
119
120 error_destroy_mc_io:
121 fsl_destroy_mc_io(mc_io);
122 return error;
123 }
124
125 /**
126 * Destroys an MC I/O object
127 *
128 * @mc_io: MC I/O object to destroy
129 */
fsl_destroy_mc_io(struct fsl_mc_io * mc_io)130 void fsl_destroy_mc_io(struct fsl_mc_io *mc_io)
131 {
132 struct fsl_mc_device *dpmcp_dev;
133
134 if (!mc_io)
135 return;
136
137 dpmcp_dev = mc_io->dpmcp_dev;
138
139 if (dpmcp_dev)
140 fsl_mc_io_unset_dpmcp(mc_io);
141
142 devm_iounmap(mc_io->dev, mc_io->portal_virt_addr);
143 devm_release_mem_region(mc_io->dev,
144 mc_io->portal_phys_addr,
145 mc_io->portal_size);
146
147 mc_io->portal_virt_addr = NULL;
148 devm_kfree(mc_io->dev, mc_io);
149 }
150
151 /**
152 * fsl_mc_portal_allocate - Allocates an MC portal
153 *
154 * @mc_dev: MC device for which the MC portal is to be allocated
155 * @mc_io_flags: Flags for the fsl_mc_io object that wraps the allocated
156 * MC portal.
157 * @new_mc_io: Pointer to area where the pointer to the fsl_mc_io object
158 * that wraps the allocated MC portal is to be returned
159 *
160 * This function allocates an MC portal from the device's parent DPRC,
161 * from the corresponding MC bus' pool of MC portals and wraps
162 * it in a new fsl_mc_io object. If 'mc_dev' is a DPRC itself, the
163 * portal is allocated from its own MC bus.
164 */
fsl_mc_portal_allocate(struct fsl_mc_device * mc_dev,u16 mc_io_flags,struct fsl_mc_io ** new_mc_io)165 int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
166 u16 mc_io_flags,
167 struct fsl_mc_io **new_mc_io)
168 {
169 struct fsl_mc_device *mc_bus_dev;
170 struct fsl_mc_bus *mc_bus;
171 phys_addr_t mc_portal_phys_addr;
172 size_t mc_portal_size;
173 struct fsl_mc_device *dpmcp_dev;
174 int error = -EINVAL;
175 struct fsl_mc_resource *resource = NULL;
176 struct fsl_mc_io *mc_io = NULL;
177
178 if (mc_dev->flags & FSL_MC_IS_DPRC) {
179 mc_bus_dev = mc_dev;
180 } else {
181 if (!dev_is_fsl_mc(mc_dev->dev.parent))
182 return error;
183
184 mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
185 }
186
187 mc_bus = to_fsl_mc_bus(mc_bus_dev);
188 *new_mc_io = NULL;
189 error = fsl_mc_resource_allocate(mc_bus, FSL_MC_POOL_DPMCP, &resource);
190 if (error < 0)
191 return error;
192
193 error = -EINVAL;
194 dpmcp_dev = resource->data;
195
196 if (dpmcp_dev->obj_desc.ver_major < DPMCP_MIN_VER_MAJOR ||
197 (dpmcp_dev->obj_desc.ver_major == DPMCP_MIN_VER_MAJOR &&
198 dpmcp_dev->obj_desc.ver_minor < DPMCP_MIN_VER_MINOR)) {
199 dev_err(&dpmcp_dev->dev,
200 "ERROR: Version %d.%d of DPMCP not supported.\n",
201 dpmcp_dev->obj_desc.ver_major,
202 dpmcp_dev->obj_desc.ver_minor);
203 error = -ENOTSUPP;
204 goto error_cleanup_resource;
205 }
206
207 mc_portal_phys_addr = dpmcp_dev->regions[0].start;
208 mc_portal_size = resource_size(dpmcp_dev->regions);
209
210 error = fsl_create_mc_io(&mc_bus_dev->dev,
211 mc_portal_phys_addr,
212 mc_portal_size, dpmcp_dev,
213 mc_io_flags, &mc_io);
214 if (error < 0)
215 goto error_cleanup_resource;
216
217 dpmcp_dev->consumer_link = device_link_add(&mc_dev->dev,
218 &dpmcp_dev->dev,
219 DL_FLAG_AUTOREMOVE_CONSUMER);
220 if (!dpmcp_dev->consumer_link) {
221 error = -EINVAL;
222 goto error_cleanup_mc_io;
223 }
224
225 *new_mc_io = mc_io;
226 return 0;
227
228 error_cleanup_mc_io:
229 fsl_destroy_mc_io(mc_io);
230 error_cleanup_resource:
231 fsl_mc_resource_free(resource);
232 return error;
233 }
234 EXPORT_SYMBOL_GPL(fsl_mc_portal_allocate);
235
236 /**
237 * fsl_mc_portal_free - Returns an MC portal to the pool of free MC portals
238 * of a given MC bus
239 *
240 * @mc_io: Pointer to the fsl_mc_io object that wraps the MC portal to free
241 */
fsl_mc_portal_free(struct fsl_mc_io * mc_io)242 void fsl_mc_portal_free(struct fsl_mc_io *mc_io)
243 {
244 struct fsl_mc_device *dpmcp_dev;
245 struct fsl_mc_resource *resource;
246
247 /*
248 * Every mc_io obtained by calling fsl_mc_portal_allocate() is supposed
249 * to have a DPMCP object associated with.
250 */
251 dpmcp_dev = mc_io->dpmcp_dev;
252
253 resource = dpmcp_dev->resource;
254 if (!resource || resource->type != FSL_MC_POOL_DPMCP)
255 return;
256
257 if (resource->data != dpmcp_dev)
258 return;
259
260 fsl_destroy_mc_io(mc_io);
261 fsl_mc_resource_free(resource);
262
263 dpmcp_dev->consumer_link = NULL;
264 }
265 EXPORT_SYMBOL_GPL(fsl_mc_portal_free);
266
267 /**
268 * fsl_mc_portal_reset - Resets the dpmcp object for a given fsl_mc_io object
269 *
270 * @mc_io: Pointer to the fsl_mc_io object that wraps the MC portal to free
271 */
fsl_mc_portal_reset(struct fsl_mc_io * mc_io)272 int fsl_mc_portal_reset(struct fsl_mc_io *mc_io)
273 {
274 int error;
275 struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
276
277 error = dpmcp_reset(mc_io, 0, dpmcp_dev->mc_handle);
278 if (error < 0) {
279 dev_err(&dpmcp_dev->dev, "dpmcp_reset() failed: %d\n", error);
280 return error;
281 }
282
283 return 0;
284 }
285 EXPORT_SYMBOL_GPL(fsl_mc_portal_reset);
286
