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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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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 <asm/irq.h>
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#include <mach/hardware.h>
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#include <mach/serial.h>
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#include <mach/irqs.h>
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#define UART_DAVINCI_PWREMU 0x0c
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static inline unsigned int davinci_serial_in(struct plat_serial8250_port *up,
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int offset)
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{
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offset <<= up->regshift;
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return (unsigned int)__raw_readb(up->membase + offset);
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}
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static inline void davinci_serial_outp(struct plat_serial8250_port *p,
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int offset, int value)
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{
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offset <<= p->regshift;
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__raw_writeb(value, p->membase + offset);
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}
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static struct plat_serial8250_port serial_platform_data[] = {
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{
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.membase = (char *)IO_ADDRESS(DAVINCI_UART0_BASE),
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.mapbase = (unsigned long)DAVINCI_UART0_BASE,
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.irq = IRQ_UARTINT0,
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.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
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.iotype = UPIO_MEM,
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.regshift = 2,
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.uartclk = 27000000,
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},
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{
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.flags = 0
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},
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};
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static struct platform_device serial_device = {
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.name = "serial8250",
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.id = PLAT8250_DEV_PLATFORM,
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.dev = {
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.platform_data = serial_platform_data,
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},
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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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/* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
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unsigned int pwremu = 0;
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davinci_serial_outp(p, UART_IER, 0); /* disable all interrupts */
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davinci_serial_outp(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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davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);
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}
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static int __init davinci_init(void)
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{
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davinci_serial_reset(&serial_platform_data[0]);
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return platform_device_register(&serial_device);
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}
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arch_initcall(davinci_init);
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