1 // SPDX-License-Identifier: GPL-2.0-or-later
17 #include <linux/aspeed-lpc-ctrl.h>
19 #define DEVICE_NAME	"aspeed-lpc-ctrl"
40 	struct regmap		*scu;  member
45 	return container_of(file->private_data, struct aspeed_lpc_ctrl,  in file_aspeed_lpc_ctrl()
52 	unsigned long vsize = vma->vm_end - vma->vm_start;  in aspeed_lpc_ctrl_mmap()
53 	pgprot_t prot = vma->vm_page_prot;  in aspeed_lpc_ctrl_mmap()
55 	if (vma->vm_pgoff + vma_pages(vma) > lpc_ctrl->mem_size >> PAGE_SHIFT)  in aspeed_lpc_ctrl_mmap()
56 		return -EINVAL;  in aspeed_lpc_ctrl_mmap()
61 	if (remap_pfn_range(vma, vma->vm_start,  in aspeed_lpc_ctrl_mmap()
62 		(lpc_ctrl->mem_base >> PAGE_SHIFT) + vma->vm_pgoff,  in aspeed_lpc_ctrl_mmap()
64 		return -EAGAIN;  in aspeed_lpc_ctrl_mmap()
73 	struct device *dev = file->private_data;  in aspeed_lpc_ctrl_ioctl()
81 		return -EFAULT;  in aspeed_lpc_ctrl_ioctl()
84 		return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
90 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
94 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
96 		/* If memory-region is not described in device tree */  in aspeed_lpc_ctrl_ioctl()
97 		if (!lpc_ctrl->mem_size) {  in aspeed_lpc_ctrl_ioctl()
99 			return -ENXIO;  in aspeed_lpc_ctrl_ioctl()
102 		map.size = lpc_ctrl->mem_size;  in aspeed_lpc_ctrl_ioctl()
104 		return copy_to_user(p, &map, sizeof(map)) ? -EFAULT : 0;  in aspeed_lpc_ctrl_ioctl()
128 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
134 		if (map.offset & (map.size - 1))  in aspeed_lpc_ctrl_ioctl()
135 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
138 			if (!lpc_ctrl->pnor_size) {  in aspeed_lpc_ctrl_ioctl()
140 				return -ENXIO;  in aspeed_lpc_ctrl_ioctl()
142 			addr = lpc_ctrl->pnor_base;  in aspeed_lpc_ctrl_ioctl()
143 			size = lpc_ctrl->pnor_size;  in aspeed_lpc_ctrl_ioctl()
145 			/* If memory-region is not described in device tree */  in aspeed_lpc_ctrl_ioctl()
146 			if (!lpc_ctrl->mem_size) {  in aspeed_lpc_ctrl_ioctl()
148 				return -ENXIO;  in aspeed_lpc_ctrl_ioctl()
150 			addr = lpc_ctrl->mem_base;  in aspeed_lpc_ctrl_ioctl()
151 			size = lpc_ctrl->mem_size;  in aspeed_lpc_ctrl_ioctl()
153 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
159 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
162 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
175 		rc = regmap_write(lpc_ctrl->regmap, HICR7,  in aspeed_lpc_ctrl_ioctl()
180 		rc = regmap_write(lpc_ctrl->regmap, HICR8,  in aspeed_lpc_ctrl_ioctl()
181 				(~(map.size - 1)) | ((map.size >> 16) - 1));  in aspeed_lpc_ctrl_ioctl()
188 		if (lpc_ctrl->fwh2ahb) {  in aspeed_lpc_ctrl_ioctl()
190 			 * Enable FWH2AHB in SCU debug control register 2. This  in aspeed_lpc_ctrl_ioctl()
194 			regmap_update_bits(lpc_ctrl->scu, 0x0D8, BIT(2), 0);  in aspeed_lpc_ctrl_ioctl()
201 			regmap_write(lpc_ctrl->regmap, HICR6, SW_FWH2AHB);  in aspeed_lpc_ctrl_ioctl()
208 		return regmap_update_bits(lpc_ctrl->regmap, HICR5,  in aspeed_lpc_ctrl_ioctl()
213 	return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
231 	dev = &pdev->dev;  in aspeed_lpc_ctrl_probe()
235 		return -ENOMEM;  in aspeed_lpc_ctrl_probe()
238 	node = of_parse_phandle(dev->of_node, "flash", 0);  in aspeed_lpc_ctrl_probe()
249 		lpc_ctrl->pnor_size = resource_size(&resm);  in aspeed_lpc_ctrl_probe()
250 		lpc_ctrl->pnor_base = resm.start;  in aspeed_lpc_ctrl_probe()
254 	dev_set_drvdata(&pdev->dev, lpc_ctrl);  in aspeed_lpc_ctrl_probe()
256 	/* If memory-region is described in device tree then store */  in aspeed_lpc_ctrl_probe()
257 	node = of_parse_phandle(dev->of_node, "memory-region", 0);  in aspeed_lpc_ctrl_probe()
265 			return -ENXIO;  in aspeed_lpc_ctrl_probe()
268 		lpc_ctrl->mem_size = resource_size(&resm);  in aspeed_lpc_ctrl_probe()
269 		lpc_ctrl->mem_base = resm.start;  in aspeed_lpc_ctrl_probe()
271 		if (!is_power_of_2(lpc_ctrl->mem_size)) {  in aspeed_lpc_ctrl_probe()
273 			       (unsigned int)lpc_ctrl->mem_size);  in aspeed_lpc_ctrl_probe()
274 			return -EINVAL;  in aspeed_lpc_ctrl_probe()
277 		if (!IS_ALIGNED(lpc_ctrl->mem_base, lpc_ctrl->mem_size)) {  in aspeed_lpc_ctrl_probe()
279 			       (unsigned int)lpc_ctrl->mem_size);  in aspeed_lpc_ctrl_probe()
280 			return -EINVAL;  in aspeed_lpc_ctrl_probe()
284 	np = pdev->dev.parent->of_node;  in aspeed_lpc_ctrl_probe()
285 	if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") &&  in aspeed_lpc_ctrl_probe()
286 	    !of_device_is_compatible(np, "aspeed,ast2500-lpc-v2") &&  in aspeed_lpc_ctrl_probe()
287 	    !of_device_is_compatible(np, "aspeed,ast2600-lpc-v2")) {  in aspeed_lpc_ctrl_probe()
289 		return -ENODEV;  in aspeed_lpc_ctrl_probe()
292 	lpc_ctrl->regmap = syscon_node_to_regmap(np);  in aspeed_lpc_ctrl_probe()
293 	if (IS_ERR(lpc_ctrl->regmap)) {  in aspeed_lpc_ctrl_probe()
295 		return -ENODEV;  in aspeed_lpc_ctrl_probe()
298 	if (of_device_is_compatible(dev->of_node, "aspeed,ast2600-lpc-ctrl")) {  in aspeed_lpc_ctrl_probe()
299 		lpc_ctrl->fwh2ahb = true;  in aspeed_lpc_ctrl_probe()
301 		lpc_ctrl->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2600-scu");  in aspeed_lpc_ctrl_probe()
302 		if (IS_ERR(lpc_ctrl->scu)) {  in aspeed_lpc_ctrl_probe()
303 			dev_err(dev, "couldn't find scu\n");  in aspeed_lpc_ctrl_probe()
304 			return PTR_ERR(lpc_ctrl->scu);  in aspeed_lpc_ctrl_probe()
308 	lpc_ctrl->clk = devm_clk_get(dev, NULL);  in aspeed_lpc_ctrl_probe()
309 	if (IS_ERR(lpc_ctrl->clk))  in aspeed_lpc_ctrl_probe()
310 		return dev_err_probe(dev, PTR_ERR(lpc_ctrl->clk),  in aspeed_lpc_ctrl_probe()
312 	rc = clk_prepare_enable(lpc_ctrl->clk);  in aspeed_lpc_ctrl_probe()
318 	lpc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR;  in aspeed_lpc_ctrl_probe()
319 	lpc_ctrl->miscdev.name = DEVICE_NAME;  in aspeed_lpc_ctrl_probe()
320 	lpc_ctrl->miscdev.fops = &aspeed_lpc_ctrl_fops;  in aspeed_lpc_ctrl_probe()
321 	lpc_ctrl->miscdev.parent = dev;  in aspeed_lpc_ctrl_probe()
322 	rc = misc_register(&lpc_ctrl->miscdev);  in aspeed_lpc_ctrl_probe()
331 	clk_disable_unprepare(lpc_ctrl->clk);  in aspeed_lpc_ctrl_probe()
337 	struct aspeed_lpc_ctrl *lpc_ctrl = dev_get_drvdata(&pdev->dev);  in aspeed_lpc_ctrl_remove()
339 	misc_deregister(&lpc_ctrl->miscdev);  in aspeed_lpc_ctrl_remove()
340 	clk_disable_unprepare(lpc_ctrl->clk);  in aspeed_lpc_ctrl_remove()
344 	{ .compatible = "aspeed,ast2400-lpc-ctrl" },
345 	{ .compatible = "aspeed,ast2500-lpc-ctrl" },
346 	{ .compatible = "aspeed,ast2600-lpc-ctrl" },