1 // SPDX-License-Identifier: GPL-2.0-or-later
16 #include <linux/aspeed-lpc-ctrl.h>
18 #define DEVICE_NAME	"aspeed-lpc-ctrl"
39 	return container_of(file->private_data, struct aspeed_lpc_ctrl,  in file_aspeed_lpc_ctrl()
46 	unsigned long vsize = vma->vm_end - vma->vm_start;  in aspeed_lpc_ctrl_mmap()
47 	pgprot_t prot = vma->vm_page_prot;  in aspeed_lpc_ctrl_mmap()
49 	if (vma->vm_pgoff + vsize > lpc_ctrl->mem_base + lpc_ctrl->mem_size)  in aspeed_lpc_ctrl_mmap()
50 		return -EINVAL;  in aspeed_lpc_ctrl_mmap()
55 	if (remap_pfn_range(vma, vma->vm_start,  in aspeed_lpc_ctrl_mmap()
56 		(lpc_ctrl->mem_base >> PAGE_SHIFT) + vma->vm_pgoff,  in aspeed_lpc_ctrl_mmap()
58 		return -EAGAIN;  in aspeed_lpc_ctrl_mmap()
67 	struct device *dev = file->private_data;  in aspeed_lpc_ctrl_ioctl()
75 		return -EFAULT;  in aspeed_lpc_ctrl_ioctl()
78 		return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
84 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
88 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
90 		/* If memory-region is not described in device tree */  in aspeed_lpc_ctrl_ioctl()
91 		if (!lpc_ctrl->mem_size) {  in aspeed_lpc_ctrl_ioctl()
93 			return -ENXIO;  in aspeed_lpc_ctrl_ioctl()
96 		map.size = lpc_ctrl->mem_size;  in aspeed_lpc_ctrl_ioctl()
98 		return copy_to_user(p, &map, sizeof(map)) ? -EFAULT : 0;  in aspeed_lpc_ctrl_ioctl()
104 		 * The bottom half of HICR7 is the MSB of the HOST LPC  in aspeed_lpc_ctrl_ioctl()
122 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
128 		if (map.offset & (map.size - 1))  in aspeed_lpc_ctrl_ioctl()
129 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
132 			if (!lpc_ctrl->pnor_size) {  in aspeed_lpc_ctrl_ioctl()
134 				return -ENXIO;  in aspeed_lpc_ctrl_ioctl()
136 			addr = lpc_ctrl->pnor_base;  in aspeed_lpc_ctrl_ioctl()
137 			size = lpc_ctrl->pnor_size;  in aspeed_lpc_ctrl_ioctl()
139 			/* If memory-region is not described in device tree */  in aspeed_lpc_ctrl_ioctl()
140 			if (!lpc_ctrl->mem_size) {  in aspeed_lpc_ctrl_ioctl()
142 				return -ENXIO;  in aspeed_lpc_ctrl_ioctl()
144 			addr = lpc_ctrl->mem_base;  in aspeed_lpc_ctrl_ioctl()
145 			size = lpc_ctrl->mem_size;  in aspeed_lpc_ctrl_ioctl()
147 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
153 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
156 			return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
161 		 * addr (host lpc address) is safe regardless of values. This  in aspeed_lpc_ctrl_ioctl()
163 		 * side of the LPC bus. This cannot impact the hosts own  in aspeed_lpc_ctrl_ioctl()
164 		 * memory space by surprise as LPC specific accessors are  in aspeed_lpc_ctrl_ioctl()
169 		rc = regmap_write(lpc_ctrl->regmap, HICR7,  in aspeed_lpc_ctrl_ioctl()
174 		rc = regmap_write(lpc_ctrl->regmap, HICR8,  in aspeed_lpc_ctrl_ioctl()
175 				(~(map.size - 1)) | ((map.size >> 16) - 1));  in aspeed_lpc_ctrl_ioctl()
180 		 * Enable LPC FHW cycles. This is required for the host to  in aspeed_lpc_ctrl_ioctl()
183 		return regmap_update_bits(lpc_ctrl->regmap, HICR5,  in aspeed_lpc_ctrl_ioctl()
188 	return -EINVAL;  in aspeed_lpc_ctrl_ioctl()
205 	dev = &pdev->dev;  in aspeed_lpc_ctrl_probe()
209 		return -ENOMEM;  in aspeed_lpc_ctrl_probe()
212 	node = of_parse_phandle(dev->of_node, "flash", 0);  in aspeed_lpc_ctrl_probe()
223 		lpc_ctrl->pnor_size = resource_size(&resm);  in aspeed_lpc_ctrl_probe()
224 		lpc_ctrl->pnor_base = resm.start;  in aspeed_lpc_ctrl_probe()
228 	dev_set_drvdata(&pdev->dev, lpc_ctrl);  in aspeed_lpc_ctrl_probe()
230 	/* If memory-region is described in device tree then store */  in aspeed_lpc_ctrl_probe()
231 	node = of_parse_phandle(dev->of_node, "memory-region", 0);  in aspeed_lpc_ctrl_probe()
239 			return -ENXIO;  in aspeed_lpc_ctrl_probe()
242 		lpc_ctrl->mem_size = resource_size(&resm);  in aspeed_lpc_ctrl_probe()
243 		lpc_ctrl->mem_base = resm.start;  in aspeed_lpc_ctrl_probe()
246 	lpc_ctrl->regmap = syscon_node_to_regmap(  in aspeed_lpc_ctrl_probe()
247 			pdev->dev.parent->of_node);  in aspeed_lpc_ctrl_probe()
248 	if (IS_ERR(lpc_ctrl->regmap)) {  in aspeed_lpc_ctrl_probe()
250 		return -ENODEV;  in aspeed_lpc_ctrl_probe()
253 	lpc_ctrl->clk = devm_clk_get(dev, NULL);  in aspeed_lpc_ctrl_probe()
254 	if (IS_ERR(lpc_ctrl->clk)) {  in aspeed_lpc_ctrl_probe()
256 		return PTR_ERR(lpc_ctrl->clk);  in aspeed_lpc_ctrl_probe()
258 	rc = clk_prepare_enable(lpc_ctrl->clk);  in aspeed_lpc_ctrl_probe()
264 	lpc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR;  in aspeed_lpc_ctrl_probe()
265 	lpc_ctrl->miscdev.name = DEVICE_NAME;  in aspeed_lpc_ctrl_probe()
266 	lpc_ctrl->miscdev.fops = &aspeed_lpc_ctrl_fops;  in aspeed_lpc_ctrl_probe()
267 	lpc_ctrl->miscdev.parent = dev;  in aspeed_lpc_ctrl_probe()
268 	rc = misc_register(&lpc_ctrl->miscdev);  in aspeed_lpc_ctrl_probe()
277 	clk_disable_unprepare(lpc_ctrl->clk);  in aspeed_lpc_ctrl_probe()
283 	struct aspeed_lpc_ctrl *lpc_ctrl = dev_get_drvdata(&pdev->dev);  in aspeed_lpc_ctrl_remove()
285 	misc_deregister(&lpc_ctrl->miscdev);  in aspeed_lpc_ctrl_remove()
286 	clk_disable_unprepare(lpc_ctrl->clk);  in aspeed_lpc_ctrl_remove()
292 	{ .compatible = "aspeed,ast2400-lpc-ctrl" },
293 	{ .compatible = "aspeed,ast2500-lpc-ctrl" },
311 MODULE_DESCRIPTION("Control for aspeed 2400/2500 LPC HOST to BMC mappings");