1 // SPDX-License-Identifier: GPL-2.0
12 #include <linux/reset-controller.h>
29 /* NPCM7xx Reset registers */
71 	writel(NPCM_SWRST << rc->sw_reset_number, rc->base + NPCM_SWRSTR);  in npcm_rc_restart()
88 	spin_lock_irqsave(&rc->lock, flags);  in npcm_rc_setclear_reset()
89 	stat = readl(rc->base + ctrl_offset);  in npcm_rc_setclear_reset()
91 		writel(stat | rst_bit, rc->base + ctrl_offset);  in npcm_rc_setclear_reset()
93 		writel(stat & ~rst_bit, rc->base + ctrl_offset);  in npcm_rc_setclear_reset()
94 	spin_unlock_irqrestore(&rc->lock, flags);  in npcm_rc_setclear_reset()
117 	return (readl(rc->base + ctrl_offset) & rst_bit);  in npcm_rc_status()
125 	offset = reset_spec->args[0];  in npcm_reset_xlate()
128 		dev_err(rcdev->dev, "Error reset register (0x%x)\n", offset);  in npcm_reset_xlate()
129 		return -EINVAL;  in npcm_reset_xlate()
131 	bit = reset_spec->args[1];  in npcm_reset_xlate()
133 		dev_err(rcdev->dev, "Error reset number (%d)\n", bit);  in npcm_reset_xlate()
134 		return -EINVAL;  in npcm_reset_xlate()
141 	{ .compatible = "nuvoton,npcm750-reset",
142 		.data = (void *)"nuvoton,npcm750-gcr" },
153 	struct device *dev = &pdev->dev;  in npcm_usb_reset()
161 	of_match_device(dev->driver->of_match_table, dev)->data;  in npcm_usb_reset()
165 		dev_err(&pdev->dev, "Failed to find %s\n", gcr_dt);  in npcm_usb_reset()
187 	/* assert reset USB PHY and USB devices */  in npcm_usb_reset()
188 	iprst1 = readl(rc->base + NPCM_IPSRST1);  in npcm_usb_reset()
189 	iprst2 = readl(rc->base + NPCM_IPSRST2);  in npcm_usb_reset()
190 	iprst3 = readl(rc->base + NPCM_IPSRST3);  in npcm_usb_reset()
197 	writel(iprst1, rc->base + NPCM_IPSRST1);  in npcm_usb_reset()
198 	writel(iprst2, rc->base + NPCM_IPSRST2);  in npcm_usb_reset()
199 	writel(iprst3, rc->base + NPCM_IPSRST3);  in npcm_usb_reset()
207 	/* deassert reset USB PHY */  in npcm_usb_reset()
209 	writel(iprst3, rc->base + NPCM_IPSRST3);  in npcm_usb_reset()
219 	/* deassert reset USB devices*/  in npcm_usb_reset()
224 	writel(iprst1, rc->base + NPCM_IPSRST1);  in npcm_usb_reset()
225 	writel(iprst2, rc->base + NPCM_IPSRST2);  in npcm_usb_reset()
226 	writel(iprst3, rc->base + NPCM_IPSRST3);  in npcm_usb_reset()
242 	rc = devm_kzalloc(&pdev->dev, sizeof(*rc), GFP_KERNEL);  in npcm_rc_probe()
244 		return -ENOMEM;  in npcm_rc_probe()
246 	rc->base = devm_platform_ioremap_resource(pdev, 0);  in npcm_rc_probe()
247 	if (IS_ERR(rc->base))  in npcm_rc_probe()
248 		return PTR_ERR(rc->base);  in npcm_rc_probe()
250 	spin_lock_init(&rc->lock);  in npcm_rc_probe()
252 	rc->rcdev.owner = THIS_MODULE;  in npcm_rc_probe()
253 	rc->rcdev.ops = &npcm_rc_ops;  in npcm_rc_probe()
254 	rc->rcdev.of_node = pdev->dev.of_node;  in npcm_rc_probe()
255 	rc->rcdev.of_reset_n_cells = 2;  in npcm_rc_probe()
256 	rc->rcdev.of_xlate = npcm_reset_xlate;  in npcm_rc_probe()
260 	ret = devm_reset_controller_register(&pdev->dev, &rc->rcdev);  in npcm_rc_probe()
262 		dev_err(&pdev->dev, "unable to register device\n");  in npcm_rc_probe()
267 		dev_warn(&pdev->dev, "NPCM USB reset failed, can cause issues with UDC and USB host\n");  in npcm_rc_probe()
269 	if (!of_property_read_u32(pdev->dev.of_node, "nuvoton,sw-reset-number",  in npcm_rc_probe()
270 				  &rc->sw_reset_number)) {  in npcm_rc_probe()
271 		if (rc->sw_reset_number && rc->sw_reset_number < 5) {  in npcm_rc_probe()
272 			rc->restart_nb.priority = 192,  in npcm_rc_probe()
273 			rc->restart_nb.notifier_call = npcm_rc_restart,  in npcm_rc_probe()
274 			ret = register_restart_handler(&rc->restart_nb);  in npcm_rc_probe()
276 				dev_warn(&pdev->dev, "failed to register restart handler\n");  in npcm_rc_probe()
286 		.name			= "npcm-reset",