1 // SPDX-License-Identifier: GPL-2.0-only
9  * Baikal-T1 CCU Dividers clock driver
12 #define pr_fmt(fmt) "bt1-ccu-div: " fmt
18 #include <linux/clk-provider.h>
19 #include <linux/reset-controller.h>
26 #include <dt-bindings/clock/bt1-ccu.h>
28 #include "ccu-div.h"
29 #include "ccu-rst.h"
124  * AXI Main Interconnect (axi_main_clk) and DDR AXI-bus (axi_ddr_clk) clocks
127  * the later is clocking the AXI-bus between DDR controller and the Main
169  * APB-bus clock is marked as critical since it's a main communication bus
170  * for the SoC devices registers IO-operations.
234 	struct device_node *np = data->np;  in ccu_div_set_data()
236 	if (of_device_is_compatible(np, "baikal,bt1-ccu-axi"))  in ccu_div_set_data()
238 	else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys"))  in ccu_div_set_data()
246 	if (of_device_is_compatible(np, "baikal,bt1-ccu-axi"))  in ccu_div_get_data()
248 	else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys"))  in ccu_div_get_data()
261 	for (idx = 0; idx < data->divs_num; ++idx) {  in ccu_div_find_desc()
262 		if (data->divs_info[idx].id == clk_id)  in ccu_div_find_desc()
263 			return data->divs[idx];  in ccu_div_find_desc()
266 	return ERR_PTR(-EINVAL);  in ccu_div_find_desc()
276 		return ERR_PTR(-ENOMEM);  in ccu_div_create_data()
278 	data->np = np;  in ccu_div_create_data()
279 	if (of_device_is_compatible(np, "baikal,bt1-ccu-axi")) {  in ccu_div_create_data()
280 		data->divs_num = ARRAY_SIZE(axi_info);  in ccu_div_create_data()
281 		data->divs_info = axi_info;  in ccu_div_create_data()
282 	} else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys")) {  in ccu_div_create_data()
283 		data->divs_num = ARRAY_SIZE(sys_info);  in ccu_div_create_data()
284 		data->divs_info = sys_info;  in ccu_div_create_data()
288 		ret = -EINVAL;  in ccu_div_create_data()
292 	data->divs = kcalloc(data->divs_num, sizeof(*data->divs), GFP_KERNEL);  in ccu_div_create_data()
293 	if (!data->divs) {  in ccu_div_create_data()
294 		ret = -ENOMEM;  in ccu_div_create_data()
308 	kfree(data->divs);  in ccu_div_free_data()
315 	data->sys_regs = syscon_node_to_regmap(data->np->parent);  in ccu_div_find_sys_regs()
316 	if (IS_ERR(data->sys_regs)) {  in ccu_div_find_sys_regs()
318 			of_node_full_name(data->np));  in ccu_div_find_sys_regs()
319 		return PTR_ERR(data->sys_regs);  in ccu_div_find_sys_regs()
332 	clk_id = clkspec->args[0];  in ccu_div_of_clk_hw_get()
335 		if (div != ERR_PTR(-EPROBE_DEFER))  in ccu_div_of_clk_hw_get()
348 	for (idx = 0; idx < data->divs_num; ++idx) {  in ccu_div_clk_register()
349 		const struct ccu_div_info *info = &data->divs_info[idx];  in ccu_div_clk_register()
352 		if (!!(info->features & CCU_DIV_BASIC) ^ defer) {  in ccu_div_clk_register()
353 			if (!data->divs[idx])  in ccu_div_clk_register()
354 				data->divs[idx] = ERR_PTR(-EPROBE_DEFER);  in ccu_div_clk_register()
359 		init.id = info->id;  in ccu_div_clk_register()
360 		init.name = info->name;  in ccu_div_clk_register()
361 		init.parent_name = info->parent_name;  in ccu_div_clk_register()
362 		init.np = data->np;  in ccu_div_clk_register()
363 		init.type = info->type;  in ccu_div_clk_register()
364 		init.flags = info->flags;  in ccu_div_clk_register()
365 		init.features = info->features;  in ccu_div_clk_register()
368 			init.base = info->base;  in ccu_div_clk_register()
369 			init.sys_regs = data->sys_regs;  in ccu_div_clk_register()
370 			init.width = info->width;  in ccu_div_clk_register()
372 			init.base = info->base;  in ccu_div_clk_register()
373 			init.sys_regs = data->sys_regs;  in ccu_div_clk_register()
374 			init.divider = info->divider;  in ccu_div_clk_register()
376 			init.base = info->base;  in ccu_div_clk_register()
377 			init.sys_regs = data->sys_regs;  in ccu_div_clk_register()
379 			init.divider = info->divider;  in ccu_div_clk_register()
382 		data->divs[idx] = ccu_div_hw_register(&init);  in ccu_div_clk_register()
383 		if (IS_ERR(data->divs[idx])) {  in ccu_div_clk_register()
384 			ret = PTR_ERR(data->divs[idx]);  in ccu_div_clk_register()
394 	for (--idx; idx >= 0; --idx) {  in ccu_div_clk_register()
395 		if (!!(data->divs_info[idx].features & CCU_DIV_BASIC) ^ defer)  in ccu_div_clk_register()
398 		ccu_div_hw_unregister(data->divs[idx]);  in ccu_div_clk_register()
409 	for (idx = 0; idx < data->divs_num; ++idx) {  in ccu_div_clk_unregister()
410 		if (!!(data->divs_info[idx].features & CCU_DIV_BASIC) ^ defer)  in ccu_div_clk_unregister()
413 		ccu_div_hw_unregister(data->divs[idx]);  in ccu_div_clk_unregister()
421 	ret = of_clk_add_hw_provider(data->np, ccu_div_of_clk_hw_get, data);  in ccu_div_of_register()
424 		       of_node_full_name(data->np));  in ccu_div_of_register()
434 	init.sys_regs = data->sys_regs;  in ccu_div_rst_register()
435 	init.np = data->np;  in ccu_div_rst_register()
437 	data->rsts = ccu_rst_hw_register(&init);  in ccu_div_rst_register()
438 	if (IS_ERR(data->rsts)) {  in ccu_div_rst_register()
440 			of_node_full_name(data->np));  in ccu_div_rst_register()
441 		return PTR_ERR(data->rsts);  in ccu_div_rst_register()
452 	data = ccu_div_get_data(dev_of_node(&pdev->dev));  in ccu_div_probe()
454 		return -EINVAL;  in ccu_div_probe()
473 	{ .compatible = "baikal,bt1-ccu-axi" },
474 	{ .compatible = "baikal,bt1-ccu-sys" },
481 		.name = "clk-ccu-div",
519 CLK_OF_DECLARE_DRIVER(ccu_axi, "baikal,bt1-ccu-axi", ccu_div_init);
520 CLK_OF_DECLARE_DRIVER(ccu_sys, "baikal,bt1-ccu-sys", ccu_div_init);