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>
26 #include <linux/delay.h>
33 #include <asm/intel-family.h>
70  * For some devices the DSDT AML code for another device turns off the device
71  * before our suspend handler runs, causing us to read/save all 1-s (0xffffffff)
115  * it can be powered off automatically whenever the last LPSS device goes down.
134 	offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;  in lpss_uart_setup()
135 	val = readl(pdata->mmio_base + offset);  in lpss_uart_setup()
136 	writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);  in lpss_uart_setup()
138 	val = readl(pdata->mmio_base + LPSS_UART_CPR);  in lpss_uart_setup()
140 		offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;  in lpss_uart_setup()
141 		val = readl(pdata->mmio_base + offset);  in lpss_uart_setup()
143 		writel(val, pdata->mmio_base + offset);  in lpss_uart_setup()
152 	offset = pdata->dev_desc->prv_offset + LPSS_RESETS;  in lpss_deassert_reset()
153 	val = readl(pdata->mmio_base + offset);  in lpss_deassert_reset()
155 	writel(val, pdata->mmio_base + offset);  in lpss_deassert_reset()
159  * BYT PWM used for backlight control by the i915 driver on systems without
165 			       "pwm-lpss-platform"),
170 	/* Only call pwm_add_table for the first PWM controller */  in byt_pwm_setup()
171 	if (acpi_dev_uid_match(pdata->adev, 1))  in byt_pwm_setup()
179 	acpi_handle handle = pdata->adev->handle;  in byt_i2c_setup()
185 	if (!acpi_dev_uid_to_integer(pdata->adev, &uid) && uid) {  in byt_i2c_setup()
189 			pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));  in byt_i2c_setup()
194 	if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))  in byt_i2c_setup()
195 		pdata->fixed_clk_rate = 133000000;  in byt_i2c_setup()
197 	writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);  in byt_i2c_setup()
203  * touch controls on some models. These touch-controls have specialized
204  * drivers which know they need the "pwm_soc_lpss_2" con-id.
209 			       "pwm-lpss-platform"),
212 			       "pwm-lpss-platform"),
217 	/* Only call pwm_add_table for the first PWM controller */  in bsw_pwm_setup()
218 	if (acpi_dev_uid_match(pdata->adev, 1))  in bsw_pwm_setup()
223 	PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_LPT_SSP),
240 	PROPERTY_ENTRY_U32("reg-io-width", 4),
241 	PROPERTY_ENTRY_U32("reg-shift", 2),
242 	PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
298 	PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BYT_SSP),
327 	PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BSW_SSP),
328 	PROPERTY_ENTRY_U32("num-cs", 2),
403 	lpss_clk_dev = platform_device_register_simple("clk-lpss-atom",  in lpt_register_clock_device()
411 	const struct lpss_device_desc *dev_desc = pdata->dev_desc;  in register_device_clock()
412 	const char *devname = dev_name(&adev->dev);  in register_device_clock()
426 		return -ENODEV;  in register_device_clock()
427 	clk = clk_data->clk;  in register_device_clock()
429 	if (!pdata->mmio_base  in register_device_clock()
430 	    || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)  in register_device_clock()
431 		return -ENODATA;  in register_device_clock()
433 	parent = clk_data->name;  in register_device_clock()
434 	prv_base = pdata->mmio_base + dev_desc->prv_offset;  in register_device_clock()
436 	if (pdata->fixed_clk_rate) {  in register_device_clock()
438 					      pdata->fixed_clk_rate);  in register_device_clock()
442 	if (dev_desc->flags & LPSS_CLK_GATE) {  in register_device_clock()
448 	if (dev_desc->flags & LPSS_CLK_DIVIDER) {  in register_device_clock()
453 		clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);  in register_device_clock()
455 			return -ENOMEM;  in register_device_clock()
462 		clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);  in register_device_clock()
465 			return -ENOMEM;  in register_device_clock()
477 	pdata->clk = clk;  in register_device_clock()
478 	clk_register_clkdev(clk, dev_desc->clk_con_id, devname);  in register_device_clock()
526 	return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid);  in acpi_lpss_is_supplier()
532 	return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid);  in acpi_lpss_is_consumer()
548 	return acpi_dev_hid_uid_match(adev, id->hid, id->uid);  in match_hid_uid()
572 	dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid);  in acpi_lpss_link_consumer()
576 	if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))  in acpi_lpss_link_consumer()
578 		device_link_add(dev2, dev1, link->flags);  in acpi_lpss_link_consumer()
588 	dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);  in acpi_lpss_link_supplier()
592 	if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))  in acpi_lpss_link_supplier()
594 		device_link_add(dev1, dev2, link->flags);  in acpi_lpss_link_supplier()
608 			acpi_lpss_link_consumer(&pdev->dev, link);  in acpi_lpss_create_device_links()
611 			acpi_lpss_link_supplier(&pdev->dev, link);  in acpi_lpss_create_device_links()
625 	dev_desc = (const struct lpss_device_desc *)id->driver_data;  in acpi_lpss_create_device()
627 		return -EINVAL;  in acpi_lpss_create_device()
631 		return -ENOMEM;  in acpi_lpss_create_device()
640 		if (dev_desc->prv_size_override)  in acpi_lpss_create_device()
641 			pdata->mmio_size = dev_desc->prv_size_override;  in acpi_lpss_create_device()
643 			pdata->mmio_size = resource_size(rentry->res);  in acpi_lpss_create_device()
644 		pdata->mmio_base = ioremap(rentry->res->start, pdata->mmio_size);  in acpi_lpss_create_device()
649 	if (!pdata->mmio_base) {  in acpi_lpss_create_device()
651 		adev->pnp.type.platform_id = 0;  in acpi_lpss_create_device()
655 	pdata->adev = adev;  in acpi_lpss_create_device()
656 	pdata->dev_desc = dev_desc;  in acpi_lpss_create_device()
658 	if (dev_desc->setup)  in acpi_lpss_create_device()
659 		dev_desc->setup(pdata);  in acpi_lpss_create_device()
661 	if (dev_desc->flags & LPSS_CLK) {  in acpi_lpss_create_device()
674 	adev->driver_data = pdata;  in acpi_lpss_create_device()
675 	pdev = acpi_create_platform_device(adev, dev_desc->properties);  in acpi_lpss_create_device()
677 		adev->driver_data = NULL;  in acpi_lpss_create_device()
695 	return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);  in __lpss_reg_read()
701 	writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);  in __lpss_reg_write()
712 		return -ENODEV;  in lpss_reg_read()
714 	spin_lock_irqsave(&dev->power.lock, flags);  in lpss_reg_read()
716 		ret = -EAGAIN;  in lpss_reg_read()
720 	if (WARN_ON(!pdata || !pdata->mmio_base)) {  in lpss_reg_read()
721 		ret = -ENODEV;  in lpss_reg_read()
728 	spin_unlock_irqrestore(&dev->power.lock, flags);  in lpss_reg_read()
739 	reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;  in lpss_ltr_show()
811  * acpi_lpss_save_ctx() - Save the private registers of LPSS device
827 		pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);  in acpi_lpss_save_ctx()
829 			pdata->prv_reg_ctx[i], offset);  in acpi_lpss_save_ctx()
834  * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
848 		__lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);  in acpi_lpss_restore_ctx()
850 			pdata->prv_reg_ctx[i], offset);  in acpi_lpss_restore_ctx()
857 	 * The following delay is needed or the subsequent write operations may  in acpi_lpss_d3_to_d0_delay()
859 	 * expects 10ms delay before the device can be accessed after D3 to D0  in acpi_lpss_d3_to_d0_delay()
860 	 * transition. However some platforms like BSW does not need this delay.  in acpi_lpss_d3_to_d0_delay()
862 	unsigned int delay = 10;	/* default 10ms delay */  in acpi_lpss_d3_to_d0_delay()  local
864 	if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY)  in acpi_lpss_d3_to_d0_delay()
865 		delay = 0;  in acpi_lpss_d3_to_d0_delay()
867 	msleep(delay);  in acpi_lpss_d3_to_d0_delay()
882 	 * This is called only on ->probe() stage where a device is either in  in acpi_lpss_activate()
883 	 * known state defined by BIOS or most likely powered off. Due to this  in acpi_lpss_activate()
884 	 * we have to deassert reset line to be sure that ->probe() will  in acpi_lpss_activate()
887 	if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))  in acpi_lpss_activate()
890 	if (pdata->dev_desc->flags & LPSS_SAVE_CTX_ONCE)  in acpi_lpss_activate()
1001 	if (pdata->dev_desc->flags & LPSS_SAVE_CTX)  in acpi_lpss_suspend()
1008 	 * wrong status for devices being about to be powered off. See  in acpi_lpss_suspend()
1036 	if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))  in acpi_lpss_resume()
1058 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_suspend_late()
1069 	if (pdata->dev_desc->resume_from_noirq) {  in acpi_lpss_suspend_noirq()
1071 		 * The driver's ->suspend_late callback will be invoked by  in acpi_lpss_suspend_noirq()
1073 		 * driver really wanted to run that code in ->suspend_noirq, but  in acpi_lpss_suspend_noirq()
1096 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_resume_early()
1118 	if (!pdata->dev_desc->resume_from_noirq)  in acpi_lpss_resume_noirq()
1122 	 * The driver's ->resume_early callback will be invoked by  in acpi_lpss_resume_noirq()
1124 	 * really wanted to run that code in ->resume_noirq, but it could not  in acpi_lpss_resume_noirq()
1142 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_restore_early()
1157 	if (!pdata->dev_desc->resume_from_noirq)  in acpi_lpss_restore_noirq()
1178 	if (pdata->dev_desc->resume_from_noirq)  in acpi_lpss_poweroff_late()
1191 	if (pdata->dev_desc->resume_from_noirq) {  in acpi_lpss_poweroff_noirq()
1254 	id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);  in acpi_lpss_platform_notify()
1255 	if (!id || !id->driver_data)  in acpi_lpss_platform_notify()
1258 	adev = ACPI_COMPANION(&pdev->dev);  in acpi_lpss_platform_notify()
1266 	if (pdata->mmio_base &&  in acpi_lpss_platform_notify()
1267 	    pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {  in acpi_lpss_platform_notify()
1268 		dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");  in acpi_lpss_platform_notify()
1274 		dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);  in acpi_lpss_platform_notify()
1278 		dev_pm_domain_set(&pdev->dev, NULL);  in acpi_lpss_platform_notify()
1281 		dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);  in acpi_lpss_platform_notify()
1282 		if (pdata->dev_desc->flags & LPSS_LTR)  in acpi_lpss_platform_notify()
1283 			return sysfs_create_group(&pdev->dev.kobj,  in acpi_lpss_platform_notify()
1287 		if (pdata->dev_desc->flags & LPSS_LTR)  in acpi_lpss_platform_notify()
1288 			sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);  in acpi_lpss_platform_notify()
1289 		dev_pm_domain_set(&pdev->dev, NULL);  in acpi_lpss_platform_notify()
1306 	if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))  in acpi_lpss_bind()
1309 	if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)  in acpi_lpss_bind()
1310 		dev->power.set_latency_tolerance = acpi_lpss_set_ltr;  in acpi_lpss_bind()
1317 	dev->power.set_latency_tolerance = NULL;  in acpi_lpss_unbind()