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191 lines
4.2 KiB
191 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* drivers/tty/serial/8250/8250_pxa.c -- driver for PXA on-board UARTS |
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* Copyright: (C) 2013 Sergei Ianovich <[email protected]> |
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* |
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* replaces drivers/serial/pxa.c by Nicolas Pitre |
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* Created: Feb 20, 2003 |
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* Copyright: (C) 2003 Monta Vista Software, Inc. |
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* |
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* Based on drivers/serial/8250.c by Russell King. |
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*/ |
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#include <linux/device.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/serial_8250.h> |
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#include <linux/serial_core.h> |
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#include <linux/serial_reg.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/clk.h> |
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#include <linux/pm_runtime.h> |
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#include "8250.h" |
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struct pxa8250_data { |
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int line; |
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struct clk *clk; |
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}; |
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static int __maybe_unused serial_pxa_suspend(struct device *dev) |
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{ |
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struct pxa8250_data *data = dev_get_drvdata(dev); |
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serial8250_suspend_port(data->line); |
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return 0; |
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} |
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static int __maybe_unused serial_pxa_resume(struct device *dev) |
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{ |
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struct pxa8250_data *data = dev_get_drvdata(dev); |
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serial8250_resume_port(data->line); |
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return 0; |
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} |
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static const struct dev_pm_ops serial_pxa_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(serial_pxa_suspend, serial_pxa_resume) |
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}; |
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static const struct of_device_id serial_pxa_dt_ids[] = { |
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{ .compatible = "mrvl,pxa-uart", }, |
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{ .compatible = "mrvl,mmp-uart", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, serial_pxa_dt_ids); |
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/* Uart divisor latch write */ |
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static void serial_pxa_dl_write(struct uart_8250_port *up, int value) |
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{ |
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unsigned int dll; |
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serial_out(up, UART_DLL, value & 0xff); |
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/* |
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* work around Erratum #74 according to Marvel(R) PXA270M Processor |
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* Specification Update (April 19, 2010) |
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*/ |
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dll = serial_in(up, UART_DLL); |
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WARN_ON(dll != (value & 0xff)); |
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serial_out(up, UART_DLM, value >> 8 & 0xff); |
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} |
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static void serial_pxa_pm(struct uart_port *port, unsigned int state, |
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unsigned int oldstate) |
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{ |
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struct pxa8250_data *data = port->private_data; |
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if (!state) |
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clk_prepare_enable(data->clk); |
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else |
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clk_disable_unprepare(data->clk); |
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} |
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static int serial_pxa_probe(struct platform_device *pdev) |
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{ |
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struct uart_8250_port uart = {}; |
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struct pxa8250_data *data; |
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struct resource *mmres; |
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int irq, ret; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!mmres) |
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return -ENODEV; |
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(data->clk)) |
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return PTR_ERR(data->clk); |
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ret = clk_prepare(data->clk); |
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if (ret) |
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return ret; |
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ret = of_alias_get_id(pdev->dev.of_node, "serial"); |
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if (ret >= 0) |
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uart.port.line = ret; |
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uart.port.type = PORT_XSCALE; |
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uart.port.iotype = UPIO_MEM32; |
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uart.port.mapbase = mmres->start; |
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uart.port.regshift = 2; |
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uart.port.irq = irq; |
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uart.port.fifosize = 64; |
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uart.port.flags = UPF_IOREMAP | UPF_SKIP_TEST | UPF_FIXED_TYPE; |
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uart.port.dev = &pdev->dev; |
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uart.port.uartclk = clk_get_rate(data->clk); |
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uart.port.pm = serial_pxa_pm; |
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uart.port.private_data = data; |
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uart.dl_write = serial_pxa_dl_write; |
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ret = serial8250_register_8250_port(&uart); |
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if (ret < 0) |
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goto err_clk; |
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data->line = ret; |
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platform_set_drvdata(pdev, data); |
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return 0; |
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err_clk: |
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clk_unprepare(data->clk); |
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return ret; |
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} |
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static int serial_pxa_remove(struct platform_device *pdev) |
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{ |
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struct pxa8250_data *data = platform_get_drvdata(pdev); |
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serial8250_unregister_port(data->line); |
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clk_unprepare(data->clk); |
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return 0; |
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} |
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static struct platform_driver serial_pxa_driver = { |
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.probe = serial_pxa_probe, |
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.remove = serial_pxa_remove, |
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.driver = { |
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.name = "pxa2xx-uart", |
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.pm = &serial_pxa_pm_ops, |
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.of_match_table = serial_pxa_dt_ids, |
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}, |
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}; |
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module_platform_driver(serial_pxa_driver); |
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#ifdef CONFIG_SERIAL_8250_CONSOLE |
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static int __init early_serial_pxa_setup(struct earlycon_device *device, |
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const char *options) |
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{ |
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struct uart_port *port = &device->port; |
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if (!(device->port.membase || device->port.iobase)) |
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return -ENODEV; |
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port->regshift = 2; |
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return early_serial8250_setup(device, NULL); |
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} |
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OF_EARLYCON_DECLARE(early_pxa, "mrvl,pxa-uart", early_serial_pxa_setup); |
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#endif |
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MODULE_AUTHOR("Sergei Ianovich"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:pxa2xx-uart");
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