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74ba9207e1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* TI DaVinci serial driver
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*
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* Copyright (C) 2006 Texas Instruments.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/serial_8250.h>
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#include <linux/serial_reg.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <mach/serial.h>
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#include <mach/cputype.h>
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static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
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int value)
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{
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offset <<= p->regshift;
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WARN_ONCE(!p->membase, "unmapped write: uart[%d]\n", offset);
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__raw_writel(value, p->membase + offset);
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}
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static void __init davinci_serial_reset(struct plat_serial8250_port *p)
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{
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unsigned int pwremu = 0;
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serial_write_reg(p, UART_IER, 0); /* disable all interrupts */
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/* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
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serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
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mdelay(10);
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pwremu |= (0x3 << 13);
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pwremu |= 0x1;
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serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
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if (cpu_is_davinci_dm646x())
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serial_write_reg(p, UART_DM646X_SCR,
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UART_DM646X_SCR_TX_WATERMARK);
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}
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int __init davinci_serial_init(struct platform_device *serial_dev)
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{
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int i, ret = 0;
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struct device *dev;
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struct plat_serial8250_port *p;
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struct clk *clk;
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/*
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* Make sure the serial ports are muxed on at this point.
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* You have to mux them off in device drivers later on if not needed.
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*/
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for (i = 0; serial_dev[i].dev.platform_data != NULL; i++) {
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dev = &serial_dev[i].dev;
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p = dev->platform_data;
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ret = platform_device_register(&serial_dev[i]);
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if (ret)
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continue;
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clk = clk_get(dev, NULL);
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if (IS_ERR(clk)) {
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pr_err("%s:%d: failed to get UART%d clock\n",
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__func__, __LINE__, i);
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continue;
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}
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clk_prepare_enable(clk);
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p->uartclk = clk_get_rate(clk);
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if (!p->membase && p->mapbase) {
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p->membase = ioremap(p->mapbase, SZ_4K);
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if (p->membase)
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p->flags &= ~UPF_IOREMAP;
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else
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pr_err("uart regs ioremap failed\n");
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}
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if (p->membase && p->type != PORT_AR7)
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davinci_serial_reset(p);
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}
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return ret;
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}
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