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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI AM33XX SRAM EMIF Driver
4 *
5 * Copyright (C) 2016-2017 Texas Instruments Inc.
6 * Dave Gerlach
7 */
8
9#include <linux/err.h>
10#include <linux/genalloc.h>
11#include <linux/io.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_platform.h>
16#include <linux/platform_device.h>
17#include <linux/sram.h>
18#include <linux/ti-emif-sram.h>
19
20#include "emif.h"
21
22#define TI_EMIF_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
23 (unsigned long)&ti_emif_sram)
24
25#define EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES 0x00a0
26
27struct ti_emif_data {
28 phys_addr_t ti_emif_sram_phys;
29 phys_addr_t ti_emif_sram_data_phys;
30 unsigned long ti_emif_sram_virt;
31 unsigned long ti_emif_sram_data_virt;
32 struct gen_pool *sram_pool_code;
33 struct gen_pool *sram_pool_data;
34 struct ti_emif_pm_data pm_data;
35 struct ti_emif_pm_functions pm_functions;
36};
37
38static struct ti_emif_data *emif_instance;
39
40static u32 sram_suspend_address(struct ti_emif_data *emif_data,
41 unsigned long addr)
42{
43 return (emif_data->ti_emif_sram_virt +
44 TI_EMIF_SRAM_SYMBOL_OFFSET(addr));
45}
46
47static phys_addr_t sram_resume_address(struct ti_emif_data *emif_data,
48 unsigned long addr)
49{
50 return ((unsigned long)emif_data->ti_emif_sram_phys +
51 TI_EMIF_SRAM_SYMBOL_OFFSET(addr));
52}
53
54static void ti_emif_free_sram(struct ti_emif_data *emif_data)
55{
56 gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,
57 ti_emif_sram_sz);
58 gen_pool_free(emif_data->sram_pool_data,
59 emif_data->ti_emif_sram_data_virt,
60 sizeof(struct emif_regs_amx3));
61}
62
63static int ti_emif_alloc_sram(struct device *dev,
64 struct ti_emif_data *emif_data)
65{
66 struct device_node *np = dev->of_node;
67 int ret;
68
69 emif_data->sram_pool_code = of_gen_pool_get(np, "sram", 0);
70 if (!emif_data->sram_pool_code) {
71 dev_err(dev, "Unable to get sram pool for ocmcram code\n");
72 return -ENODEV;
73 }
74
75 emif_data->ti_emif_sram_virt =
76 gen_pool_alloc(emif_data->sram_pool_code,
77 ti_emif_sram_sz);
78 if (!emif_data->ti_emif_sram_virt) {
79 dev_err(dev, "Unable to allocate code memory from ocmcram\n");
80 return -ENOMEM;
81 }
82
83 /* Save physical address to calculate resume offset during pm init */
84 emif_data->ti_emif_sram_phys =
85 gen_pool_virt_to_phys(emif_data->sram_pool_code,
86 emif_data->ti_emif_sram_virt);
87
88 /* Get sram pool for data section and allocate space */
89 emif_data->sram_pool_data = of_gen_pool_get(np, "sram", 1);
90 if (!emif_data->sram_pool_data) {
91 dev_err(dev, "Unable to get sram pool for ocmcram data\n");
92 ret = -ENODEV;
93 goto err_free_sram_code;
94 }
95
96 emif_data->ti_emif_sram_data_virt =
97 gen_pool_alloc(emif_data->sram_pool_data,
98 sizeof(struct emif_regs_amx3));
99 if (!emif_data->ti_emif_sram_data_virt) {
100 dev_err(dev, "Unable to allocate data memory from ocmcram\n");
101 ret = -ENOMEM;
102 goto err_free_sram_code;
103 }
104
105 /* Save physical address to calculate resume offset during pm init */
106 emif_data->ti_emif_sram_data_phys =
107 gen_pool_virt_to_phys(emif_data->sram_pool_data,
108 emif_data->ti_emif_sram_data_virt);
109 /*
110 * These functions are called during suspend path while MMU is
111 * still on so add virtual base to offset for absolute address
112 */
113 emif_data->pm_functions.save_context =
114 sram_suspend_address(emif_data,
115 (unsigned long)ti_emif_save_context);
116 emif_data->pm_functions.enter_sr =
117 sram_suspend_address(emif_data,
118 (unsigned long)ti_emif_enter_sr);
119 emif_data->pm_functions.abort_sr =
120 sram_suspend_address(emif_data,
121 (unsigned long)ti_emif_abort_sr);
122
123 /*
124 * These are called during resume path when MMU is not enabled
125 * so physical address is used instead
126 */
127 emif_data->pm_functions.restore_context =
128 sram_resume_address(emif_data,
129 (unsigned long)ti_emif_restore_context);
130 emif_data->pm_functions.exit_sr =
131 sram_resume_address(emif_data,
132 (unsigned long)ti_emif_exit_sr);
133 emif_data->pm_functions.run_hw_leveling =
134 sram_resume_address(emif_data,
135 (unsigned long)ti_emif_run_hw_leveling);
136
137 emif_data->pm_data.regs_virt =
138 (struct emif_regs_amx3 *)emif_data->ti_emif_sram_data_virt;
139 emif_data->pm_data.regs_phys = emif_data->ti_emif_sram_data_phys;
140
141 return 0;
142
143err_free_sram_code:
144 gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,
145 ti_emif_sram_sz);
146 return ret;
147}
148
149static int ti_emif_push_sram(struct device *dev, struct ti_emif_data *emif_data)
150{
151 void *copy_addr;
152 u32 data_addr;
153
154 copy_addr = sram_exec_copy(emif_data->sram_pool_code,
155 (void *)emif_data->ti_emif_sram_virt,
156 &ti_emif_sram, ti_emif_sram_sz);
157 if (!copy_addr) {
158 dev_err(dev, "Cannot copy emif code to sram\n");
159 return -ENODEV;
160 }
161
162 data_addr = sram_suspend_address(emif_data,
163 (unsigned long)&ti_emif_pm_sram_data);
164 copy_addr = sram_exec_copy(emif_data->sram_pool_code,
165 (void *)data_addr,
166 &emif_data->pm_data,
167 sizeof(emif_data->pm_data));
168 if (!copy_addr) {
169 dev_err(dev, "Cannot copy emif data to code sram\n");
170 return -ENODEV;
171 }
172
173 return 0;
174}
175
176/*
177 * Due to Usage Note 3.1.2 "DDR3: JEDEC Compliance for Maximum
178 * Self-Refresh Command Limit" found in AM335x Silicon Errata
179 * (Document SPRZ360F Revised November 2013) we must configure
180 * the self refresh delay timer to 0xA (8192 cycles) to avoid
181 * generating too many refresh command from the EMIF.
182 */
183static void ti_emif_configure_sr_delay(struct ti_emif_data *emif_data)
184{
185 writel(EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES,
186 (emif_data->pm_data.ti_emif_base_addr_virt +
187 EMIF_POWER_MANAGEMENT_CONTROL));
188
189 writel(EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES,
190 (emif_data->pm_data.ti_emif_base_addr_virt +
191 EMIF_POWER_MANAGEMENT_CTRL_SHDW));
192}
193
194/**
195 * ti_emif_copy_pm_function_table - copy mapping of pm funcs in sram
196 * @sram_pool: pointer to struct gen_pool where dst resides
197 * @dst: void * to address that table should be copied
198 *
199 * Returns 0 if success other error code if table is not available
200 */
201int ti_emif_copy_pm_function_table(struct gen_pool *sram_pool, void *dst)
202{
203 void *copy_addr;
204
205 if (!emif_instance)
206 return -ENODEV;
207
208 copy_addr = sram_exec_copy(sram_pool, dst,
209 &emif_instance->pm_functions,
210 sizeof(emif_instance->pm_functions));
211 if (!copy_addr)
212 return -ENODEV;
213
214 return 0;
215}
216EXPORT_SYMBOL_GPL(ti_emif_copy_pm_function_table);
217
218/**
219 * ti_emif_get_mem_type - return type for memory type in use
220 *
221 * Returns memory type value read from EMIF or error code if fails
222 */
223int ti_emif_get_mem_type(void)
224{
225 unsigned long temp;
226
227 if (!emif_instance)
228 return -ENODEV;
229
230 temp = readl(emif_instance->pm_data.ti_emif_base_addr_virt +
231 EMIF_SDRAM_CONFIG);
232
233 temp = (temp & SDRAM_TYPE_MASK) >> SDRAM_TYPE_SHIFT;
234 return temp;
235}
236EXPORT_SYMBOL_GPL(ti_emif_get_mem_type);
237
238static const struct of_device_id ti_emif_of_match[] = {
239 { .compatible = "ti,emif-am3352", .data =
240 (void *)EMIF_SRAM_AM33_REG_LAYOUT, },
241 { .compatible = "ti,emif-am4372", .data =
242 (void *)EMIF_SRAM_AM43_REG_LAYOUT, },
243 {},
244};
245MODULE_DEVICE_TABLE(of, ti_emif_of_match);
246
247#ifdef CONFIG_PM_SLEEP
248static int ti_emif_resume(struct device *dev)
249{
250 unsigned long tmp =
251 __raw_readl((void __iomem *)emif_instance->ti_emif_sram_virt);
252
253 /*
254 * Check to see if what we are copying is already present in the
255 * first byte at the destination, only copy if it is not which
256 * indicates we have lost context and sram no longer contains
257 * the PM code
258 */
259 if (tmp != ti_emif_sram)
260 ti_emif_push_sram(dev, emif_instance);
261
262 return 0;
263}
264
265static int ti_emif_suspend(struct device *dev)
266{
267 /*
268 * The contents will be present in DDR hence no need to
269 * explicitly save
270 */
271 return 0;
272}
273#endif /* CONFIG_PM_SLEEP */
274
275static int ti_emif_probe(struct platform_device *pdev)
276{
277 int ret;
278 struct resource *res;
279 struct device *dev = &pdev->dev;
280 const struct of_device_id *match;
281 struct ti_emif_data *emif_data;
282
283 emif_data = devm_kzalloc(dev, sizeof(*emif_data), GFP_KERNEL);
284 if (!emif_data)
285 return -ENOMEM;
286
287 match = of_match_device(ti_emif_of_match, &pdev->dev);
288 if (!match)
289 return -ENODEV;
290
291 emif_data->pm_data.ti_emif_sram_config = (unsigned long)match->data;
292
293 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
294 emif_data->pm_data.ti_emif_base_addr_virt = devm_ioremap_resource(dev,
295 res);
296 if (IS_ERR(emif_data->pm_data.ti_emif_base_addr_virt)) {
297 ret = PTR_ERR(emif_data->pm_data.ti_emif_base_addr_virt);
298 return ret;
299 }
300
301 emif_data->pm_data.ti_emif_base_addr_phys = res->start;
302
303 ti_emif_configure_sr_delay(emif_data);
304
305 ret = ti_emif_alloc_sram(dev, emif_data);
306 if (ret)
307 return ret;
308
309 ret = ti_emif_push_sram(dev, emif_data);
310 if (ret)
311 goto fail_free_sram;
312
313 emif_instance = emif_data;
314
315 return 0;
316
317fail_free_sram:
318 ti_emif_free_sram(emif_data);
319
320 return ret;
321}
322
323static int ti_emif_remove(struct platform_device *pdev)
324{
325 struct ti_emif_data *emif_data = emif_instance;
326
327 emif_instance = NULL;
328
329 ti_emif_free_sram(emif_data);
330
331 return 0;
332}
333
334static const struct dev_pm_ops ti_emif_pm_ops = {
335 SET_SYSTEM_SLEEP_PM_OPS(ti_emif_suspend, ti_emif_resume)
336};
337
338static struct platform_driver ti_emif_driver = {
339 .probe = ti_emif_probe,
340 .remove = ti_emif_remove,
341 .driver = {
342 .name = KBUILD_MODNAME,
343 .of_match_table = of_match_ptr(ti_emif_of_match),
344 .pm = &ti_emif_pm_ops,
345 },
346};
347module_platform_driver(ti_emif_driver);
348
349MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
350MODULE_DESCRIPTION("Texas Instruments SRAM EMIF driver");
351MODULE_LICENSE("GPL v2");
1/*
2 * TI AM33XX SRAM EMIF Driver
3 *
4 * Copyright (C) 2016-2017 Texas Instruments Inc.
5 * Dave Gerlach
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/err.h>
18#include <linux/genalloc.h>
19#include <linux/io.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/of.h>
23#include <linux/of_platform.h>
24#include <linux/platform_device.h>
25#include <linux/sram.h>
26#include <linux/ti-emif-sram.h>
27
28#include "emif.h"
29
30#define TI_EMIF_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
31 (unsigned long)&ti_emif_sram)
32
33#define EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES 0x00a0
34
35struct ti_emif_data {
36 phys_addr_t ti_emif_sram_phys;
37 phys_addr_t ti_emif_sram_data_phys;
38 unsigned long ti_emif_sram_virt;
39 unsigned long ti_emif_sram_data_virt;
40 struct gen_pool *sram_pool_code;
41 struct gen_pool *sram_pool_data;
42 struct ti_emif_pm_data pm_data;
43 struct ti_emif_pm_functions pm_functions;
44};
45
46static struct ti_emif_data *emif_instance;
47
48static u32 sram_suspend_address(struct ti_emif_data *emif_data,
49 unsigned long addr)
50{
51 return (emif_data->ti_emif_sram_virt +
52 TI_EMIF_SRAM_SYMBOL_OFFSET(addr));
53}
54
55static phys_addr_t sram_resume_address(struct ti_emif_data *emif_data,
56 unsigned long addr)
57{
58 return ((unsigned long)emif_data->ti_emif_sram_phys +
59 TI_EMIF_SRAM_SYMBOL_OFFSET(addr));
60}
61
62static void ti_emif_free_sram(struct ti_emif_data *emif_data)
63{
64 gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,
65 ti_emif_sram_sz);
66 gen_pool_free(emif_data->sram_pool_data,
67 emif_data->ti_emif_sram_data_virt,
68 sizeof(struct emif_regs_amx3));
69}
70
71static int ti_emif_alloc_sram(struct device *dev,
72 struct ti_emif_data *emif_data)
73{
74 struct device_node *np = dev->of_node;
75 int ret;
76
77 emif_data->sram_pool_code = of_gen_pool_get(np, "sram", 0);
78 if (!emif_data->sram_pool_code) {
79 dev_err(dev, "Unable to get sram pool for ocmcram code\n");
80 return -ENODEV;
81 }
82
83 emif_data->ti_emif_sram_virt =
84 gen_pool_alloc(emif_data->sram_pool_code,
85 ti_emif_sram_sz);
86 if (!emif_data->ti_emif_sram_virt) {
87 dev_err(dev, "Unable to allocate code memory from ocmcram\n");
88 return -ENOMEM;
89 }
90
91 /* Save physical address to calculate resume offset during pm init */
92 emif_data->ti_emif_sram_phys =
93 gen_pool_virt_to_phys(emif_data->sram_pool_code,
94 emif_data->ti_emif_sram_virt);
95
96 /* Get sram pool for data section and allocate space */
97 emif_data->sram_pool_data = of_gen_pool_get(np, "sram", 1);
98 if (!emif_data->sram_pool_data) {
99 dev_err(dev, "Unable to get sram pool for ocmcram data\n");
100 ret = -ENODEV;
101 goto err_free_sram_code;
102 }
103
104 emif_data->ti_emif_sram_data_virt =
105 gen_pool_alloc(emif_data->sram_pool_data,
106 sizeof(struct emif_regs_amx3));
107 if (!emif_data->ti_emif_sram_data_virt) {
108 dev_err(dev, "Unable to allocate data memory from ocmcram\n");
109 ret = -ENOMEM;
110 goto err_free_sram_code;
111 }
112
113 /* Save physical address to calculate resume offset during pm init */
114 emif_data->ti_emif_sram_data_phys =
115 gen_pool_virt_to_phys(emif_data->sram_pool_data,
116 emif_data->ti_emif_sram_data_virt);
117 /*
118 * These functions are called during suspend path while MMU is
119 * still on so add virtual base to offset for absolute address
120 */
121 emif_data->pm_functions.save_context =
122 sram_suspend_address(emif_data,
123 (unsigned long)ti_emif_save_context);
124 emif_data->pm_functions.enter_sr =
125 sram_suspend_address(emif_data,
126 (unsigned long)ti_emif_enter_sr);
127 emif_data->pm_functions.abort_sr =
128 sram_suspend_address(emif_data,
129 (unsigned long)ti_emif_abort_sr);
130
131 /*
132 * These are called during resume path when MMU is not enabled
133 * so physical address is used instead
134 */
135 emif_data->pm_functions.restore_context =
136 sram_resume_address(emif_data,
137 (unsigned long)ti_emif_restore_context);
138 emif_data->pm_functions.exit_sr =
139 sram_resume_address(emif_data,
140 (unsigned long)ti_emif_exit_sr);
141
142 emif_data->pm_data.regs_virt =
143 (struct emif_regs_amx3 *)emif_data->ti_emif_sram_data_virt;
144 emif_data->pm_data.regs_phys = emif_data->ti_emif_sram_data_phys;
145
146 return 0;
147
148err_free_sram_code:
149 gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,
150 ti_emif_sram_sz);
151 return ret;
152}
153
154static int ti_emif_push_sram(struct device *dev, struct ti_emif_data *emif_data)
155{
156 void *copy_addr;
157 u32 data_addr;
158
159 copy_addr = sram_exec_copy(emif_data->sram_pool_code,
160 (void *)emif_data->ti_emif_sram_virt,
161 &ti_emif_sram, ti_emif_sram_sz);
162 if (!copy_addr) {
163 dev_err(dev, "Cannot copy emif code to sram\n");
164 return -ENODEV;
165 }
166
167 data_addr = sram_suspend_address(emif_data,
168 (unsigned long)&ti_emif_pm_sram_data);
169 copy_addr = sram_exec_copy(emif_data->sram_pool_code,
170 (void *)data_addr,
171 &emif_data->pm_data,
172 sizeof(emif_data->pm_data));
173 if (!copy_addr) {
174 dev_err(dev, "Cannot copy emif data to code sram\n");
175 return -ENODEV;
176 }
177
178 return 0;
179}
180
181/*
182 * Due to Usage Note 3.1.2 "DDR3: JEDEC Compliance for Maximum
183 * Self-Refresh Command Limit" found in AM335x Silicon Errata
184 * (Document SPRZ360F Revised November 2013) we must configure
185 * the self refresh delay timer to 0xA (8192 cycles) to avoid
186 * generating too many refresh command from the EMIF.
187 */
188static void ti_emif_configure_sr_delay(struct ti_emif_data *emif_data)
189{
190 writel(EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES,
191 (emif_data->pm_data.ti_emif_base_addr_virt +
192 EMIF_POWER_MANAGEMENT_CONTROL));
193
194 writel(EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES,
195 (emif_data->pm_data.ti_emif_base_addr_virt +
196 EMIF_POWER_MANAGEMENT_CTRL_SHDW));
197}
198
199/**
200 * ti_emif_copy_pm_function_table - copy mapping of pm funcs in sram
201 * @sram_pool: pointer to struct gen_pool where dst resides
202 * @dst: void * to address that table should be copied
203 *
204 * Returns 0 if success other error code if table is not available
205 */
206int ti_emif_copy_pm_function_table(struct gen_pool *sram_pool, void *dst)
207{
208 void *copy_addr;
209
210 if (!emif_instance)
211 return -ENODEV;
212
213 copy_addr = sram_exec_copy(sram_pool, dst,
214 &emif_instance->pm_functions,
215 sizeof(emif_instance->pm_functions));
216 if (!copy_addr)
217 return -ENODEV;
218
219 return 0;
220}
221EXPORT_SYMBOL_GPL(ti_emif_copy_pm_function_table);
222
223/**
224 * ti_emif_get_mem_type - return type for memory type in use
225 *
226 * Returns memory type value read from EMIF or error code if fails
227 */
228int ti_emif_get_mem_type(void)
229{
230 unsigned long temp;
231
232 if (!emif_instance)
233 return -ENODEV;
234
235 temp = readl(emif_instance->pm_data.ti_emif_base_addr_virt +
236 EMIF_SDRAM_CONFIG);
237
238 temp = (temp & SDRAM_TYPE_MASK) >> SDRAM_TYPE_SHIFT;
239 return temp;
240}
241EXPORT_SYMBOL_GPL(ti_emif_get_mem_type);
242
243static const struct of_device_id ti_emif_of_match[] = {
244 { .compatible = "ti,emif-am3352", .data =
245 (void *)EMIF_SRAM_AM33_REG_LAYOUT, },
246 { .compatible = "ti,emif-am4372", .data =
247 (void *)EMIF_SRAM_AM43_REG_LAYOUT, },
248 {},
249};
250MODULE_DEVICE_TABLE(of, ti_emif_of_match);
251
252static int ti_emif_probe(struct platform_device *pdev)
253{
254 int ret;
255 struct resource *res;
256 struct device *dev = &pdev->dev;
257 const struct of_device_id *match;
258 struct ti_emif_data *emif_data;
259
260 emif_data = devm_kzalloc(dev, sizeof(*emif_data), GFP_KERNEL);
261 if (!emif_data)
262 return -ENOMEM;
263
264 match = of_match_device(ti_emif_of_match, &pdev->dev);
265 if (!match)
266 return -ENODEV;
267
268 emif_data->pm_data.ti_emif_sram_config = (unsigned long)match->data;
269
270 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
271 emif_data->pm_data.ti_emif_base_addr_virt = devm_ioremap_resource(dev,
272 res);
273 if (IS_ERR(emif_data->pm_data.ti_emif_base_addr_virt)) {
274 ret = PTR_ERR(emif_data->pm_data.ti_emif_base_addr_virt);
275 return ret;
276 }
277
278 emif_data->pm_data.ti_emif_base_addr_phys = res->start;
279
280 ti_emif_configure_sr_delay(emif_data);
281
282 ret = ti_emif_alloc_sram(dev, emif_data);
283 if (ret)
284 return ret;
285
286 ret = ti_emif_push_sram(dev, emif_data);
287 if (ret)
288 goto fail_free_sram;
289
290 emif_instance = emif_data;
291
292 return 0;
293
294fail_free_sram:
295 ti_emif_free_sram(emif_data);
296
297 return ret;
298}
299
300static int ti_emif_remove(struct platform_device *pdev)
301{
302 struct ti_emif_data *emif_data = emif_instance;
303
304 emif_instance = NULL;
305
306 ti_emif_free_sram(emif_data);
307
308 return 0;
309}
310
311static struct platform_driver ti_emif_driver = {
312 .probe = ti_emif_probe,
313 .remove = ti_emif_remove,
314 .driver = {
315 .name = KBUILD_MODNAME,
316 .of_match_table = of_match_ptr(ti_emif_of_match),
317 },
318};
319module_platform_driver(ti_emif_driver);
320
321MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
322MODULE_DESCRIPTION("Texas Instruments SRAM EMIF driver");
323MODULE_LICENSE("GPL v2");