1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI AM33XX SRAM EMIF Driver
5  * Copyright (C) 2016-2017 Texas Instruments Inc.
17 #include <linux/sram.h>
18 #include <linux/ti-emif-sram.h>
22 #define TI_EMIF_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
43 	return (emif_data->ti_emif_sram_virt +  in sram_suspend_address()
50 	return ((unsigned long)emif_data->ti_emif_sram_phys +  in sram_resume_address()
56 	gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,  in ti_emif_free_sram()
58 	gen_pool_free(emif_data->sram_pool_data,  in ti_emif_free_sram()
59 		      emif_data->ti_emif_sram_data_virt,  in ti_emif_free_sram()
63 static int ti_emif_alloc_sram(struct device *dev,  in ti_emif_alloc_sram()
66 	struct device_node *np = dev->of_node;  in ti_emif_alloc_sram()
69 	emif_data->sram_pool_code = of_gen_pool_get(np, "sram", 0);  in ti_emif_alloc_sram()
70 	if (!emif_data->sram_pool_code) {  in ti_emif_alloc_sram()
71 		dev_err(dev, "Unable to get sram pool for ocmcram code\n");  in ti_emif_alloc_sram()
72 		return -ENODEV;  in ti_emif_alloc_sram()
75 	emif_data->ti_emif_sram_virt =  in ti_emif_alloc_sram()
76 			gen_pool_alloc(emif_data->sram_pool_code,  in ti_emif_alloc_sram()
78 	if (!emif_data->ti_emif_sram_virt) {  in ti_emif_alloc_sram()
80 		return -ENOMEM;  in ti_emif_alloc_sram()
84 	emif_data->ti_emif_sram_phys =  in ti_emif_alloc_sram()
85 			gen_pool_virt_to_phys(emif_data->sram_pool_code,  in ti_emif_alloc_sram()
86 					      emif_data->ti_emif_sram_virt);  in ti_emif_alloc_sram()
88 	/* Get sram pool for data section and allocate space */  in ti_emif_alloc_sram()
89 	emif_data->sram_pool_data = of_gen_pool_get(np, "sram", 1);  in ti_emif_alloc_sram()
90 	if (!emif_data->sram_pool_data) {  in ti_emif_alloc_sram()
91 		dev_err(dev, "Unable to get sram pool for ocmcram data\n");  in ti_emif_alloc_sram()
92 		ret = -ENODEV;  in ti_emif_alloc_sram()
96 	emif_data->ti_emif_sram_data_virt =  in ti_emif_alloc_sram()
97 				gen_pool_alloc(emif_data->sram_pool_data,  in ti_emif_alloc_sram()
99 	if (!emif_data->ti_emif_sram_data_virt) {  in ti_emif_alloc_sram()
101 		ret = -ENOMEM;  in ti_emif_alloc_sram()
106 	emif_data->ti_emif_sram_data_phys =  in ti_emif_alloc_sram()
107 		gen_pool_virt_to_phys(emif_data->sram_pool_data,  in ti_emif_alloc_sram()
108 				      emif_data->ti_emif_sram_data_virt);  in ti_emif_alloc_sram()
113 	emif_data->pm_functions.save_context =  in ti_emif_alloc_sram()
116 	emif_data->pm_functions.enter_sr =  in ti_emif_alloc_sram()
119 	emif_data->pm_functions.abort_sr =  in ti_emif_alloc_sram()
127 	emif_data->pm_functions.restore_context =  in ti_emif_alloc_sram()
130 	emif_data->pm_functions.exit_sr =  in ti_emif_alloc_sram()
133 	emif_data->pm_functions.run_hw_leveling =  in ti_emif_alloc_sram()
137 	emif_data->pm_data.regs_virt =  in ti_emif_alloc_sram()
138 		(struct emif_regs_amx3 *)emif_data->ti_emif_sram_data_virt;  in ti_emif_alloc_sram()
139 	emif_data->pm_data.regs_phys = emif_data->ti_emif_sram_data_phys;  in ti_emif_alloc_sram()
144 	gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,  in ti_emif_alloc_sram()
149 static int ti_emif_push_sram(struct device *dev, struct ti_emif_data *emif_data)  in ti_emif_push_sram()
154 	copy_addr = sram_exec_copy(emif_data->sram_pool_code,  in ti_emif_push_sram()
155 				   (void *)emif_data->ti_emif_sram_virt,  in ti_emif_push_sram()
158 		dev_err(dev, "Cannot copy emif code to sram\n");  in ti_emif_push_sram()
159 		return -ENODEV;  in ti_emif_push_sram()
164 	copy_addr = sram_exec_copy(emif_data->sram_pool_code,  in ti_emif_push_sram()
166 				   &emif_data->pm_data,  in ti_emif_push_sram()
167 				   sizeof(emif_data->pm_data));  in ti_emif_push_sram()
169 		dev_err(dev, "Cannot copy emif data to code sram\n");  in ti_emif_push_sram()
170 		return -ENODEV;  in ti_emif_push_sram()
178  * Self-Refresh Command Limit" found in AM335x Silicon Errata
186 	       (emif_data->pm_data.ti_emif_base_addr_virt +  in ti_emif_configure_sr_delay()
190 	       (emif_data->pm_data.ti_emif_base_addr_virt +  in ti_emif_configure_sr_delay()
195  * ti_emif_copy_pm_function_table - copy mapping of pm funcs in sram
206 		return -ENODEV;  in ti_emif_copy_pm_function_table()
209 				   &emif_instance->pm_functions,  in ti_emif_copy_pm_function_table()
210 				   sizeof(emif_instance->pm_functions));  in ti_emif_copy_pm_function_table()
212 		return -ENODEV;  in ti_emif_copy_pm_function_table()
219  * ti_emif_get_mem_type - return type for memory type in use
228 		return -ENODEV;  in ti_emif_get_mem_type()
230 	temp = readl(emif_instance->pm_data.ti_emif_base_addr_virt +  in ti_emif_get_mem_type()
239 	{ .compatible = "ti,emif-am3352", .data =
241 	{ .compatible = "ti,emif-am4372", .data =
248 static int ti_emif_resume(struct device *dev)  in ti_emif_resume()
251 			__raw_readl((void __iomem *)emif_instance->ti_emif_sram_virt);  in ti_emif_resume()
256 	 * indicates we have lost context and sram no longer contains  in ti_emif_resume()
265 static int ti_emif_suspend(struct device *dev)  in ti_emif_suspend()
279 	struct device *dev = &pdev->dev;  in ti_emif_probe()
284 		return -ENOMEM;  in ti_emif_probe()
286 	emif_data->pm_data.ti_emif_sram_config = (unsigned long) device_get_match_data(&pdev->dev);  in ti_emif_probe()
288 	emif_data->pm_data.ti_emif_base_addr_virt = devm_platform_get_and_ioremap_resource(pdev,  in ti_emif_probe()
291 	if (IS_ERR(emif_data->pm_data.ti_emif_base_addr_virt)) {  in ti_emif_probe()
292 		ret = PTR_ERR(emif_data->pm_data.ti_emif_base_addr_virt);  in ti_emif_probe()
296 	emif_data->pm_data.ti_emif_base_addr_phys = res->start;  in ti_emif_probe()
344 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
345 MODULE_DESCRIPTION("Texas Instruments SRAM EMIF driver");