1 // SPDX-License-Identifier: GPL-2.0+
19 #include <linux/clk.h>
26 	struct clk *clk;  member
27 	struct clk *bus_clk;
54 	return DIV_ROUND_CLOSEST(port->uartclk, 16 * baud + 2) - 2;  in npcm_get_divisor()
59 	port->get_divisor = npcm_get_divisor;  in npcm_setup()
60 	port->startup = npcm_startup;  in npcm_setup()
73 	struct uart_8250_port *port8250 = serial8250_get_port(info->line);  in of_platform_serial_clk_notifier_cb()
77 		serial8250_update_uartclk(&port8250->port, ndata->new_rate);  in of_platform_serial_clk_notifier_cb()
92 	struct device *dev = &ofdev->dev;  in of_platform_serial_setup()
93 	struct device_node *np = dev->of_node;  in of_platform_serial_setup()
94 	struct uart_port *port = &up->port;  in of_platform_serial_setup()
100 	pm_runtime_enable(&ofdev->dev);  in of_platform_serial_setup()
101 	pm_runtime_get_sync(&ofdev->dev);  in of_platform_serial_setup()
109 	port->dev = &ofdev->dev;  in of_platform_serial_setup()
110 	port->flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_FIXED_TYPE;  in of_platform_serial_setup()
111 	spin_lock_init(&port->lock);  in of_platform_serial_setup()
114 		port->iobase = resource.start;  in of_platform_serial_setup()
116 		port->mapbase = resource.start;  in of_platform_serial_setup()
117 		port->mapsize = resource_size(&resource);  in of_platform_serial_setup()
118 		port->flags |= UPF_IOREMAP;  in of_platform_serial_setup()
125 	/* Get clk rate through clk driver if present */  in of_platform_serial_setup()
126 	if (!port->uartclk) {  in of_platform_serial_setup()
127 		struct clk *bus_clk;  in of_platform_serial_setup()
136 		info->clk = devm_clk_get_enabled(dev, bus_clk ? "core" : NULL);  in of_platform_serial_setup()
137 		if (IS_ERR(info->clk)) {  in of_platform_serial_setup()
138 			ret = dev_err_probe(dev, PTR_ERR(info->clk), "failed to get clock\n");  in of_platform_serial_setup()
142 		info->bus_clk = bus_clk;  in of_platform_serial_setup()
143 		port->uartclk = clk_get_rate(info->clk);  in of_platform_serial_setup()
145 	/* If current-speed was set, then try not to change it. */  in of_platform_serial_setup()
146 	if (of_property_read_u32(np, "current-speed", &spd) == 0)  in of_platform_serial_setup()
147 		port->custom_divisor = port->uartclk / (16 * spd);  in of_platform_serial_setup()
150 	if (of_device_is_compatible(np, "mrvl,mmp-uart"))  in of_platform_serial_setup()
151 		port->regshift = 2;  in of_platform_serial_setup()
153 	info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);  in of_platform_serial_setup()
154 	if (IS_ERR(info->rst)) {  in of_platform_serial_setup()
155 		ret = PTR_ERR(info->rst);  in of_platform_serial_setup()
159 	ret = reset_control_deassert(info->rst);  in of_platform_serial_setup()
163 	port->type = type;  in of_platform_serial_setup()
164 	port->rs485_config = serial8250_em485_config;  in of_platform_serial_setup()
165 	port->rs485_supported = serial8250_em485_supported;  in of_platform_serial_setup()
166 	up->rs485_start_tx = serial8250_em485_start_tx;  in of_platform_serial_setup()
167 	up->rs485_stop_tx = serial8250_em485_stop_tx;  in of_platform_serial_setup()
186 	     of_device_is_compatible(np, "fsl,16550-FIFO64"))) {  in of_platform_serial_setup()
187 		port->handle_irq = fsl8250_handle_irq;  in of_platform_serial_setup()
188 		port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);  in of_platform_serial_setup()
193 	pm_runtime_put_sync(&ofdev->dev);  in of_platform_serial_setup()
194 	pm_runtime_disable(&ofdev->dev);  in of_platform_serial_setup()
210 	    of_device_is_compatible(ofdev->dev.of_node, "brcm,bcm7271-uart"))  in of_platform_serial_probe()
211 		return -ENODEV;  in of_platform_serial_probe()
213 	port_type = (unsigned long)of_device_get_match_data(&ofdev->dev);  in of_platform_serial_probe()
215 		return -EINVAL;  in of_platform_serial_probe()
217 	if (of_property_read_bool(ofdev->dev.of_node, "used-by-rtas"))  in of_platform_serial_probe()
218 		return -EBUSY;  in of_platform_serial_probe()
222 		return -ENOMEM;  in of_platform_serial_probe()
233 	if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold",  in of_platform_serial_probe()
236 		port8250.tx_loadsz = port8250.port.fifosize - tx_threshold;  in of_platform_serial_probe()
238 	if (of_property_read_bool(ofdev->dev.of_node, "auto-flow-control"))  in of_platform_serial_probe()
241 	if (of_property_read_u32(ofdev->dev.of_node,  in of_platform_serial_probe()
242 			"overrun-throttle-ms",  in of_platform_serial_probe()
250 	info->type = port_type;  in of_platform_serial_probe()
251 	info->line = ret;  in of_platform_serial_probe()
254 	if (info->clk) {  in of_platform_serial_probe()
255 		info->clk_notifier.notifier_call = of_platform_serial_clk_notifier_cb;  in of_platform_serial_probe()
256 		ret = clk_notifier_register(info->clk, &info->clk_notifier);  in of_platform_serial_probe()
265 	serial8250_unregister_port(info->line);  in of_platform_serial_probe()
267 	pm_runtime_put_sync(&ofdev->dev);  in of_platform_serial_probe()
268 	pm_runtime_disable(&ofdev->dev);  in of_platform_serial_probe()
281 	if (info->clk)  in of_platform_serial_remove()
282 		clk_notifier_unregister(info->clk, &info->clk_notifier);  in of_platform_serial_remove()
284 	serial8250_unregister_port(info->line);  in of_platform_serial_remove()
286 	reset_control_assert(info->rst);  in of_platform_serial_remove()
287 	pm_runtime_put_sync(&ofdev->dev);  in of_platform_serial_remove()
288 	pm_runtime_disable(&ofdev->dev);  in of_platform_serial_remove()
296 	struct uart_8250_port *port8250 = serial8250_get_port(info->line);  in of_serial_suspend()
297 	struct uart_port *port = &port8250->port;  in of_serial_suspend()
299 	serial8250_suspend_port(info->line);  in of_serial_suspend()
303 		clk_disable_unprepare(info->clk);  in of_serial_suspend()
304 		clk_disable_unprepare(info->bus_clk);  in of_serial_suspend()
312 	struct uart_8250_port *port8250 = serial8250_get_port(info->line);  in of_serial_resume()
313 	struct uart_port *port = &port8250->port;  in of_serial_resume()
317 		clk_prepare_enable(info->bus_clk);  in of_serial_resume()
318 		clk_prepare_enable(info->clk);  in of_serial_resume()
321 	serial8250_resume_port(info->line);  in of_serial_resume()
338 	{ .compatible = "nxp,lpc3220-uart", .data = (void *)PORT_LPC3220, },
339 	{ .compatible = "ralink,rt2880-uart", .data = (void *)PORT_RT2880, },
340 	{ .compatible = "intel,xscale-uart", .data = (void *)PORT_XSCALE, },
341 	{ .compatible = "altr,16550-FIFO32",
343 	{ .compatible = "altr,16550-FIFO64",
345 	{ .compatible = "altr,16550-FIFO128",
347 	{ .compatible = "fsl,16550-FIFO64",
349 	{ .compatible = "mediatek,mtk-btif",
351 	{ .compatible = "mrvl,mmp-uart",
353 	{ .compatible = "ti,da830-uart", .data = (void *)PORT_DA830, },
354 	{ .compatible = "nuvoton,wpcm450-uart", .data = (void *)PORT_NPCM, },
355 	{ .compatible = "nuvoton,npcm750-uart", .data = (void *)PORT_NPCM, },