2  * TI AM33XX SRAM EMIF Driver
4  * Copyright (C) 2016-2017 Texas Instruments Inc.
25 #include <linux/sram.h>
26 #include <linux/ti-emif-sram.h>
30 #define TI_EMIF_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
51 	return (emif_data->ti_emif_sram_virt +  in sram_suspend_address()
58 	return ((unsigned long)emif_data->ti_emif_sram_phys +  in sram_resume_address()
64 	gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,  in ti_emif_free_sram()
66 	gen_pool_free(emif_data->sram_pool_data,  in ti_emif_free_sram()
67 		      emif_data->ti_emif_sram_data_virt,  in ti_emif_free_sram()
74 	struct device_node *np = dev->of_node;  in ti_emif_alloc_sram()
77 	emif_data->sram_pool_code = of_gen_pool_get(np, "sram", 0);  in ti_emif_alloc_sram()
78 	if (!emif_data->sram_pool_code) {  in ti_emif_alloc_sram()
79 		dev_err(dev, "Unable to get sram pool for ocmcram code\n");  in ti_emif_alloc_sram()
80 		return -ENODEV;  in ti_emif_alloc_sram()
83 	emif_data->ti_emif_sram_virt =  in ti_emif_alloc_sram()
84 			gen_pool_alloc(emif_data->sram_pool_code,  in ti_emif_alloc_sram()
86 	if (!emif_data->ti_emif_sram_virt) {  in ti_emif_alloc_sram()
88 		return -ENOMEM;  in ti_emif_alloc_sram()
92 	emif_data->ti_emif_sram_phys =  in ti_emif_alloc_sram()
93 			gen_pool_virt_to_phys(emif_data->sram_pool_code,  in ti_emif_alloc_sram()
94 					      emif_data->ti_emif_sram_virt);  in ti_emif_alloc_sram()
96 	/* Get sram pool for data section and allocate space */  in ti_emif_alloc_sram()
97 	emif_data->sram_pool_data = of_gen_pool_get(np, "sram", 1);  in ti_emif_alloc_sram()
98 	if (!emif_data->sram_pool_data) {  in ti_emif_alloc_sram()
99 		dev_err(dev, "Unable to get sram pool for ocmcram data\n");  in ti_emif_alloc_sram()
100 		ret = -ENODEV;  in ti_emif_alloc_sram()
104 	emif_data->ti_emif_sram_data_virt =  in ti_emif_alloc_sram()
105 				gen_pool_alloc(emif_data->sram_pool_data,  in ti_emif_alloc_sram()
107 	if (!emif_data->ti_emif_sram_data_virt) {  in ti_emif_alloc_sram()
109 		ret = -ENOMEM;  in ti_emif_alloc_sram()
114 	emif_data->ti_emif_sram_data_phys =  in ti_emif_alloc_sram()
115 		gen_pool_virt_to_phys(emif_data->sram_pool_data,  in ti_emif_alloc_sram()
116 				      emif_data->ti_emif_sram_data_virt);  in ti_emif_alloc_sram()
121 	emif_data->pm_functions.save_context =  in ti_emif_alloc_sram()
124 	emif_data->pm_functions.enter_sr =  in ti_emif_alloc_sram()
127 	emif_data->pm_functions.abort_sr =  in ti_emif_alloc_sram()
135 	emif_data->pm_functions.restore_context =  in ti_emif_alloc_sram()
138 	emif_data->pm_functions.exit_sr =  in ti_emif_alloc_sram()
142 	emif_data->pm_data.regs_virt =  in ti_emif_alloc_sram()
143 		(struct emif_regs_amx3 *)emif_data->ti_emif_sram_data_virt;  in ti_emif_alloc_sram()
144 	emif_data->pm_data.regs_phys = emif_data->ti_emif_sram_data_phys;  in ti_emif_alloc_sram()
149 	gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,  in ti_emif_alloc_sram()
159 	copy_addr = sram_exec_copy(emif_data->sram_pool_code,  in ti_emif_push_sram()
160 				   (void *)emif_data->ti_emif_sram_virt,  in ti_emif_push_sram()
163 		dev_err(dev, "Cannot copy emif code to sram\n");  in ti_emif_push_sram()
164 		return -ENODEV;  in ti_emif_push_sram()
169 	copy_addr = sram_exec_copy(emif_data->sram_pool_code,  in ti_emif_push_sram()
171 				   &emif_data->pm_data,  in ti_emif_push_sram()
172 				   sizeof(emif_data->pm_data));  in ti_emif_push_sram()
174 		dev_err(dev, "Cannot copy emif data to code sram\n");  in ti_emif_push_sram()
175 		return -ENODEV;  in ti_emif_push_sram()
183  * Self-Refresh Command Limit" found in AM335x Silicon Errata
191 	       (emif_data->pm_data.ti_emif_base_addr_virt +  in ti_emif_configure_sr_delay()
195 	       (emif_data->pm_data.ti_emif_base_addr_virt +  in ti_emif_configure_sr_delay()
200  * ti_emif_copy_pm_function_table - copy mapping of pm funcs in sram
211 		return -ENODEV;  in ti_emif_copy_pm_function_table()
214 				   &emif_instance->pm_functions,  in ti_emif_copy_pm_function_table()
215 				   sizeof(emif_instance->pm_functions));  in ti_emif_copy_pm_function_table()
217 		return -ENODEV;  in ti_emif_copy_pm_function_table()
224  * ti_emif_get_mem_type - return type for memory type in use
233 		return -ENODEV;  in ti_emif_get_mem_type()
235 	temp = readl(emif_instance->pm_data.ti_emif_base_addr_virt +  in ti_emif_get_mem_type()
244 	{ .compatible = "ti,emif-am3352", .data =
246 	{ .compatible = "ti,emif-am4372", .data =
256 			__raw_readl((void *)emif_instance->ti_emif_sram_virt);  in ti_emif_resume()
261 	 * indicates we have lost context and sram no longer contains  in ti_emif_resume()
284 	struct device *dev = &pdev->dev;  in ti_emif_probe()
290 		return -ENOMEM;  in ti_emif_probe()
292 	match = of_match_device(ti_emif_of_match, &pdev->dev);  in ti_emif_probe()
294 		return -ENODEV;  in ti_emif_probe()
296 	emif_data->pm_data.ti_emif_sram_config = (unsigned long)match->data;  in ti_emif_probe()
299 	emif_data->pm_data.ti_emif_base_addr_virt = devm_ioremap_resource(dev,  in ti_emif_probe()
301 	if (IS_ERR(emif_data->pm_data.ti_emif_base_addr_virt)) {  in ti_emif_probe()
302 		ret = PTR_ERR(emif_data->pm_data.ti_emif_base_addr_virt);  in ti_emif_probe()
306 	emif_data->pm_data.ti_emif_base_addr_phys = res->start;  in ti_emif_probe()
354 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
355 MODULE_DESCRIPTION("Texas Instruments SRAM EMIF driver");