diff options
Diffstat (limited to 'arch/arm/mach-davinci/serial.c')
-rw-r--r-- | arch/arm/mach-davinci/serial.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/serial.c b/arch/arm/mach-davinci/serial.c new file mode 100644 index 00000000000..8368c93c788 --- /dev/null +++ b/arch/arm/mach-davinci/serial.c @@ -0,0 +1,96 @@ +/* + * TI DaVinci serial driver + * + * Copyright (C) 2006 Texas Instruments. + * + * 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. + * + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/serial_8250.h> +#include <linux/serial_reg.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/clk.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/hardware.h> +#include <asm/arch/serial.h> +#include <asm/arch/irqs.h> + +#define UART_DAVINCI_PWREMU 0x0c + +static inline unsigned int davinci_serial_in(struct plat_serial8250_port *up, + int offset) +{ + offset <<= up->regshift; + return (unsigned int)__raw_readb(up->membase + offset); +} + +static inline void davinci_serial_outp(struct plat_serial8250_port *p, + int offset, int value) +{ + offset <<= p->regshift; + __raw_writeb(value, p->membase + offset); +} + +static struct plat_serial8250_port serial_platform_data[] = { + { + .membase = (char *)IO_ADDRESS(DAVINCI_UART0_BASE), + .mapbase = (unsigned long)DAVINCI_UART0_BASE, + .irq = IRQ_UARTINT0, + .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, + .iotype = UPIO_MEM, + .regshift = 2, + .uartclk = 27000000, + }, + { + .flags = 0 + }, +}; + +static struct platform_device serial_device = { + .name = "serial8250", + .id = PLAT8250_DEV_PLATFORM, + .dev = { + .platform_data = serial_platform_data, + }, +}; + +static void __init davinci_serial_reset(struct plat_serial8250_port *p) +{ + /* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */ + unsigned int pwremu = 0; + + davinci_serial_outp(p, UART_IER, 0); /* disable all interrupts */ + + davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu); + mdelay(10); + + pwremu |= (0x3 << 13); + pwremu |= 0x1; + davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu); +} + +static int __init davinci_init(void) +{ + davinci_serial_reset(&serial_platform_data[0]); + return platform_device_register(&serial_device); +} + +arch_initcall(davinci_init); |