1 // SPDX-License-Identifier: GPL-2.0-only
12 #include <linux/clk-provider.h>
19 #include <linux/platform_data/x86/clk-lpss.h>
23 #include <linux/pwm.h>
25 #include <linux/delay.h>
32 #include <asm/intel-family.h>
69  * For some devices the DSDT AML code for another device turns off the device
70  * before our suspend handler runs, causing us to read/save all 1-s (0xffffffff)
114  * it can be powered off automatically whenever the last LPSS device goes down.
133 	offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;  in lpss_uart_setup()
134 	val = readl(pdata->mmio_base + offset);  in lpss_uart_setup()
135 	writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);  in lpss_uart_setup()
137 	val = readl(pdata->mmio_base + LPSS_UART_CPR);  in lpss_uart_setup()
139 		offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;  in lpss_uart_setup()
140 		val = readl(pdata->mmio_base + offset);  in lpss_uart_setup()
142 		writel(val, pdata->mmio_base + offset);  in lpss_uart_setup()
151 	offset = pdata->dev_desc->prv_offset + LPSS_RESETS;  in lpss_deassert_reset()
152 	val = readl(pdata->mmio_base + offset);  in lpss_deassert_reset()
154 	writel(val, pdata->mmio_base + offset);  in lpss_deassert_reset()
158  * BYT PWM used for backlight control by the i915 driver on systems without
164 			       "pwm-lpss-platform"),
169 	struct acpi_device *adev = pdata->adev;  in byt_pwm_setup()
171 	/* Only call pwm_add_table for the first PWM controller */  in byt_pwm_setup()
172 	if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1"))  in byt_pwm_setup()
182 	const char *uid_str = acpi_device_uid(pdata->adev);  in byt_i2c_setup()
183 	acpi_handle handle = pdata->adev->handle;  in byt_i2c_setup()
193 			pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));  in byt_i2c_setup()
198 	if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))  in byt_i2c_setup()
199 		pdata->fixed_clk_rate = 133000000;  in byt_i2c_setup()
201 	writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);  in byt_i2c_setup()
204 /* BSW PWM used for backlight control by the i915 driver */
208 			       "pwm-lpss-platform"),
213 	struct acpi_device *adev = pdata->adev;  in bsw_pwm_setup()
215 	/* Only call pwm_add_table for the first PWM controller */  in bsw_pwm_setup()
216 	if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1"))  in bsw_pwm_setup()
234 	PROPERTY_ENTRY_U32("reg-io-width", 4),
235 	PROPERTY_ENTRY_U32("reg-shift", 2),
236 	PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
388 	lpss_clk_dev = platform_device_register_simple("clk-lpss-atom",  in lpt_register_clock_device()
396 	const struct lpss_device_desc *dev_desc = pdata->dev_desc;  in register_device_clock()
397 	const char *devname = dev_name(&adev->dev);  in register_device_clock()
408 		return -ENODEV;  in register_device_clock()
409 	clk = clk_data->clk;  in register_device_clock()
411 	if (!pdata->mmio_base  in register_device_clock()
412 	    || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)  in register_device_clock()
413 		return -ENODATA;  in register_device_clock()
415 	parent = clk_data->name;  in register_device_clock()
416 	prv_base = pdata->mmio_base + dev_desc->prv_offset;  in register_device_clock()
418 	if (pdata->fixed_clk_rate) {  in register_device_clock()
420 					      pdata->fixed_clk_rate);  in register_device_clock()
424 	if (dev_desc->flags & LPSS_CLK_GATE) {  in register_device_clock()
430 	if (dev_desc->flags & LPSS_CLK_DIVIDER) {  in register_device_clock()
435 		clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);  in register_device_clock()
437 			return -ENOMEM;  in register_device_clock()
443 		clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);  in register_device_clock()
446 			return -ENOMEM;  in register_device_clock()
458 	pdata->clk = clk;  in register_device_clock()
459 	clk_register_clkdev(clk, dev_desc->clk_con_id, devname);  in register_device_clock()
507 	return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid);  in acpi_lpss_is_supplier()
513 	return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid);  in acpi_lpss_is_consumer()
529 	return acpi_dev_hid_uid_match(adev, id->hid, id->uid);  in match_hid_uid()
554 	if (!acpi_has_method(adev->handle, "_DEP"))  in acpi_lpss_dep()
557 	status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,  in acpi_lpss_dep()
560 		dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");  in acpi_lpss_dep()
577 	dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid);  in acpi_lpss_link_consumer()
581 	if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))  in acpi_lpss_link_consumer()
583 		device_link_add(dev2, dev1, link->flags);  in acpi_lpss_link_consumer()
593 	dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);  in acpi_lpss_link_supplier()
597 	if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))  in acpi_lpss_link_supplier()
599 		device_link_add(dev1, dev2, link->flags);  in acpi_lpss_link_supplier()
613 			acpi_lpss_link_consumer(&pdev->dev, link);  in acpi_lpss_create_device_links()
616 			acpi_lpss_link_supplier(&pdev->dev, link);  in acpi_lpss_create_device_links()
630 	dev_desc = (const struct lpss_device_desc *)id->driver_data;  in acpi_lpss_create_device()
637 		return -ENOMEM;  in acpi_lpss_create_device()
645 		if (resource_type(rentry->res) == IORESOURCE_MEM) {  in acpi_lpss_create_device()
646 			if (dev_desc->prv_size_override)  in acpi_lpss_create_device()
647 				pdata->mmio_size = dev_desc->prv_size_override;  in acpi_lpss_create_device()
649 				pdata->mmio_size = resource_size(rentry->res);  in acpi_lpss_create_device()
650 			pdata->mmio_base = ioremap(rentry->res->start,  in acpi_lpss_create_device()
651 						   pdata->mmio_size);  in acpi_lpss_create_device()
657 	if (!pdata->mmio_base) {  in acpi_lpss_create_device()
659 		adev->pnp.type.platform_id = 0;  in acpi_lpss_create_device()
665 	pdata->adev = adev;  in acpi_lpss_create_device()
666 	pdata->dev_desc = dev_desc;  in acpi_lpss_create_device()
668 	if (dev_desc->setup)  in acpi_lpss_create_device()
669 		dev_desc->setup(pdata);  in acpi_lpss_create_device()
671 	if (dev_desc->flags & LPSS_CLK) {  in acpi_lpss_create_device()
687 	adev->driver_data = pdata;  in acpi_lpss_create_device()
688 	pdev = acpi_create_platform_device(adev, dev_desc->properties);  in acpi_lpss_create_device()
695 	adev->driver_data = NULL;  in acpi_lpss_create_device()
704 	return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);  in __lpss_reg_read()
710 	writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);  in __lpss_reg_write()
724 	spin_lock_irqsave(&dev->power.lock, flags);  in lpss_reg_read()
726 		ret = -EAGAIN;  in lpss_reg_read()
730 	if (WARN_ON(!pdata || !pdata->mmio_base)) {  in lpss_reg_read()
731 		ret = -ENODEV;  in lpss_reg_read()
737 	spin_unlock_irqrestore(&dev->power.lock, flags);  in lpss_reg_read()
748 	reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;  in lpss_ltr_show()
820  * acpi_lpss_save_ctx() - Save the private registers of LPSS device
836 		pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);  in acpi_lpss_save_ctx()
838 			pdata->prv_reg_ctx[i], offset);  in acpi_lpss_save_ctx()
843  * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
857 		__lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);  in acpi_lpss_restore_ctx()
859 			pdata->prv_reg_ctx[i], offset);  in acpi_lpss_restore_ctx()
866 	 * The following delay is needed or the subsequent write operations may  in acpi_lpss_d3_to_d0_delay()
868 	 * expects 10ms delay before the device can be accessed after D3 to D0  in acpi_lpss_d3_to_d0_delay()
869 	 * transition. However some platforms like BSW does not need this delay.  in acpi_lpss_d3_to_d0_delay()
871 	unsigned int delay = 10;	/* default 10ms delay */  in acpi_lpss_d3_to_d0_delay()  local
873 	if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY)  in acpi_lpss_d3_to_d0_delay()
874 		delay = 0;  in acpi_lpss_d3_to_d0_delay()
876 	msleep(delay);  in acpi_lpss_d3_to_d0_delay()
891 	 * This is called only on ->probe() stage where a device is either in  in acpi_lpss_activate()
892 	 * known state defined by BIOS or most likely powered off. Due to this  in acpi_lpss_activate()
893 	 * we have to deassert reset line to be sure that ->probe() will  in acpi_lpss_activate()
896 	if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))  in acpi_lpss_activate()
900 	if (pdata->dev_desc->flags & LPSS_SAVE_CTX_ONCE)  in acpi_lpss_activate()
1012 	if (pdata->dev_desc->flags & LPSS_SAVE_CTX)  in acpi_lpss_suspend()
1019 	 * wrong status for devices being about to be powered off. See  in acpi_lpss_suspend()
1047 	if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))  in acpi_lpss_resume()
1069 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_suspend_late()
1080 	if (pdata->dev_desc->resume_from_noirq) {  in acpi_lpss_suspend_noirq()
1082 		 * The driver's ->suspend_late callback will be invoked by  in acpi_lpss_suspend_noirq()
1084 		 * driver really wanted to run that code in ->suspend_noirq, but  in acpi_lpss_suspend_noirq()
1107 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_resume_early()
1129 	if (!pdata->dev_desc->resume_from_noirq)  in acpi_lpss_resume_noirq()
1133 	 * The driver's ->resume_early callback will be invoked by  in acpi_lpss_resume_noirq()
1135 	 * really wanted to run that code in ->resume_noirq, but it could not  in acpi_lpss_resume_noirq()
1153 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_restore_early()
1168 	if (!pdata->dev_desc->resume_from_noirq)  in acpi_lpss_restore_noirq()
1189 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_poweroff_late()
1202 	if (pdata->dev_desc->resume_from_noirq) {  in acpi_lpss_poweroff_noirq()
1265 	id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);  in acpi_lpss_platform_notify()
1266 	if (!id || !id->driver_data)  in acpi_lpss_platform_notify()
1269 	if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))  in acpi_lpss_platform_notify()
1276 	if (pdata->mmio_base &&  in acpi_lpss_platform_notify()
1277 	    pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {  in acpi_lpss_platform_notify()
1278 		dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");  in acpi_lpss_platform_notify()
1284 		dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);  in acpi_lpss_platform_notify()
1288 		dev_pm_domain_set(&pdev->dev, NULL);  in acpi_lpss_platform_notify()
1291 		dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);  in acpi_lpss_platform_notify()
1292 		if (pdata->dev_desc->flags & LPSS_LTR)  in acpi_lpss_platform_notify()
1293 			return sysfs_create_group(&pdev->dev.kobj,  in acpi_lpss_platform_notify()
1297 		if (pdata->dev_desc->flags & LPSS_LTR)  in acpi_lpss_platform_notify()
1298 			sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);  in acpi_lpss_platform_notify()
1299 		dev_pm_domain_set(&pdev->dev, NULL);  in acpi_lpss_platform_notify()
1316 	if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))  in acpi_lpss_bind()
1319 	if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)  in acpi_lpss_bind()
1320 		dev->power.set_latency_tolerance = acpi_lpss_set_ltr;  in acpi_lpss_bind()
1327 	dev->power.set_latency_tolerance = NULL;  in acpi_lpss_unbind()