2  * Atmel SAMA5D2-Compatible Shutdown Controller (SHDWC) driver.
8  * Evolved from driver at91-poweroff.c.
15  * - addition to status of other wake-up inputs [1 - 15]
16  * - Analog Comparator wake-up alarm
17  * - Serial RX wake-up alarm
18  * - low power debouncer
50 #define AT91_SHDW_WUIR	0x0c		/* Shutdown Wake-up Inputs Register */
58 #define SHDW_WK_PIN(reg, cfg)	((reg) & AT91_SHDW_WKUPIS((cfg)->wkup_pin_input))
59 #define SHDW_RTCWK(reg, cfg)	(((reg) >> ((cfg)->sr_rtcwk_shift)) & 0x1)
60 #define SHDW_RTTWK(reg, cfg)	(((reg) >> ((cfg)->sr_rttwk_shift)) & 0x1)
61 #define SHDW_RTCWKEN(cfg)	(1 << ((cfg)->mr_rtcwk_shift))
62 #define SHDW_RTTWKEN(cfg)	(1 << ((cfg)->mr_rttwk_shift))
101  * Hold configuration here, cannot be more than one instance of the driver
113 	const struct reg_config *rcfg = shdw->rcfg;  in at91_wakeup_status()
117 	reg = readl(shdw->shdwc_base + AT91_SHDW_SR);  in at91_wakeup_status()
119 	dev_dbg(&pdev->dev, "%s: status = %#x\n", __func__, reg);  in at91_wakeup_status()
121 	/* Simple power-on, just bail out */  in at91_wakeup_status()
125 	if (SHDW_WK_PIN(reg, &rcfg->shdwc))  in at91_wakeup_status()
127 	else if (SHDW_RTCWK(reg, &rcfg->shdwc))  in at91_wakeup_status()
129 	else if (SHDW_RTTWK(reg, &rcfg->shdwc))  in at91_wakeup_status()
132 	pr_info("AT91: Wake-Up source: %s\n", reason);  in at91_wakeup_status()
158 		/* Shutdown CPU */  in at91_poweroff()
163 		: "r" (at91_shdwc->mpddrc_base),  in at91_poweroff()
165 		  "r" (at91_shdwc->shdwc_base),  in at91_poweroff()
167 		  "r" (at91_shdwc->pmc_base),  in at91_poweroff()
168 		  "r" (at91_shdwc->rcfg->pmc.mckr)  in at91_poweroff()
176 	int max_idx = ARRAY_SIZE(sdwc_dbc_period) - 1;  in at91_shdwc_debouncer_value()
181 		dev_warn(&pdev->dev,  in at91_shdwc_debouncer_value()
187 	for (i = max_idx - 1; i > 0; i--) {  in at91_shdwc_debouncer_value()
189 		dev_dbg(&pdev->dev, "%s: ref[%d] = %llu\n",  in at91_shdwc_debouncer_value()
208 			dev_warn(&pdev->dev, "reg property is missing for %pOF\n",  in at91_shdwc_get_wakeup_input()
215 			dev_warn(&pdev->dev,  in at91_shdwc_get_wakeup_input()
216 				 "wake-up input %d out of bounds ignore\n",  in at91_shdwc_get_wakeup_input()
222 		if (of_property_read_bool(cnp, "atmel,wakeup-active-high"))  in at91_shdwc_get_wakeup_input()
225 		dev_dbg(&pdev->dev, "%s: (child %d) wuir = %#x\n",  in at91_shdwc_get_wakeup_input()
235 	const struct reg_config *rcfg = shdw->rcfg;  in at91_shdwc_dt_configure()
236 	struct device_node *np = pdev->dev.of_node;  in at91_shdwc_dt_configure()
240 		dev_err(&pdev->dev, "device node not found\n");  in at91_shdwc_dt_configure()
244 	if (!of_property_read_u32(np, "debounce-delay-us", &tmp))  in at91_shdwc_dt_configure()
247 	if (of_property_read_bool(np, "atmel,wakeup-rtc-timer"))  in at91_shdwc_dt_configure()
248 		mode |= SHDW_RTCWKEN(&rcfg->shdwc);  in at91_shdwc_dt_configure()
250 	if (of_property_read_bool(np, "atmel,wakeup-rtt-timer"))  in at91_shdwc_dt_configure()
251 		mode |= SHDW_RTTWKEN(&rcfg->shdwc);  in at91_shdwc_dt_configure()
253 	dev_dbg(&pdev->dev, "%s: mode = %#x\n", __func__, mode);  in at91_shdwc_dt_configure()
254 	writel(mode, shdw->shdwc_base + AT91_SHDW_MR);  in at91_shdwc_dt_configure()
257 	writel(input, shdw->shdwc_base + AT91_SHDW_WUIR);  in at91_shdwc_dt_configure()
309 		.compatible = "atmel,sama5d2-shdwc",
313 		.compatible = "microchip,sam9x60-shdwc",
317 		.compatible = "microchip,sama7g5-shdwc",
326 	{ .compatible = "atmel,sama5d2-pmc" },
327 	{ .compatible = "microchip,sam9x60-pmc" },
328 	{ .compatible = "microchip,sama7g5-pmc" },
339 	if (!pdev->dev.of_node)  in at91_shdwc_probe()
340 		return -ENODEV;  in at91_shdwc_probe()
343 		return -EBUSY;  in at91_shdwc_probe()
345 	at91_shdwc = devm_kzalloc(&pdev->dev, sizeof(*at91_shdwc), GFP_KERNEL);  in at91_shdwc_probe()
347 		return -ENOMEM;  in at91_shdwc_probe()
351 	at91_shdwc->shdwc_base = devm_platform_ioremap_resource(pdev, 0);  in at91_shdwc_probe()
352 	if (IS_ERR(at91_shdwc->shdwc_base))  in at91_shdwc_probe()
353 		return PTR_ERR(at91_shdwc->shdwc_base);  in at91_shdwc_probe()
355 	match = of_match_node(at91_shdwc_of_match, pdev->dev.of_node);  in at91_shdwc_probe()
356 	at91_shdwc->rcfg = match->data;  in at91_shdwc_probe()
358 	at91_shdwc->sclk = devm_clk_get(&pdev->dev, NULL);  in at91_shdwc_probe()
359 	if (IS_ERR(at91_shdwc->sclk))  in at91_shdwc_probe()
360 		return PTR_ERR(at91_shdwc->sclk);  in at91_shdwc_probe()
362 	ret = clk_prepare_enable(at91_shdwc->sclk);  in at91_shdwc_probe()
364 		dev_err(&pdev->dev, "Could not enable slow clock\n");  in at91_shdwc_probe()
374 		ret = -ENODEV;  in at91_shdwc_probe()
378 	at91_shdwc->pmc_base = of_iomap(np, 0);  in at91_shdwc_probe()
381 	if (!at91_shdwc->pmc_base) {  in at91_shdwc_probe()
382 		ret = -ENOMEM;  in at91_shdwc_probe()
386 	if (at91_shdwc->rcfg->ddrc.type_mask) {  in at91_shdwc_probe()
388 					     "atmel,sama5d3-ddramc");  in at91_shdwc_probe()
390 			ret = -ENODEV;  in at91_shdwc_probe()
394 		at91_shdwc->mpddrc_base = of_iomap(np, 0);  in at91_shdwc_probe()
397 		if (!at91_shdwc->mpddrc_base) {  in at91_shdwc_probe()
398 			ret = -ENOMEM;  in at91_shdwc_probe()
402 		ddr_type = readl(at91_shdwc->mpddrc_base +  in at91_shdwc_probe()
403 				 at91_shdwc->rcfg->ddrc.type_offset) &  in at91_shdwc_probe()
404 				 at91_shdwc->rcfg->ddrc.type_mask;  in at91_shdwc_probe()
407 			iounmap(at91_shdwc->mpddrc_base);  in at91_shdwc_probe()
408 			at91_shdwc->mpddrc_base = NULL;  in at91_shdwc_probe()
417 	iounmap(at91_shdwc->pmc_base);  in at91_shdwc_probe()
419 	clk_disable_unprepare(at91_shdwc->sclk);  in at91_shdwc_probe()
431 	/* Reset values to disable wake-up features  */  in at91_shdwc_remove()
432 	writel(0, shdw->shdwc_base + AT91_SHDW_MR);  in at91_shdwc_remove()
433 	writel(0, shdw->shdwc_base + AT91_SHDW_WUIR);  in at91_shdwc_remove()
435 	if (shdw->mpddrc_base)  in at91_shdwc_remove()
436 		iounmap(shdw->mpddrc_base);  in at91_shdwc_remove()
437 	iounmap(shdw->pmc_base);  in at91_shdwc_remove()
439 	clk_disable_unprepare(shdw->sclk);  in at91_shdwc_remove()
446 		.name = "at91-shdwc",