diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/serial/arm_dcc.c')
-rw-r--r-- | qemu/roms/u-boot/drivers/serial/arm_dcc.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/serial/arm_dcc.c b/qemu/roms/u-boot/drivers/serial/arm_dcc.c new file mode 100644 index 000000000..5dfb02f47 --- /dev/null +++ b/qemu/roms/u-boot/drivers/serial/arm_dcc.c @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2004-2007 ARM Limited. + * Copyright (C) 2008 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * As a special exception, if other files instantiate templates or use macros + * or inline functions from this file, or you compile this file and link it + * with other works to produce a work based on this file, this file does not + * by itself cause the resulting work to be covered by the GNU General Public + * License. However the source code for this file must still be made available + * in accordance with section (3) of the GNU General Public License. + + * This exception does not invalidate any other reasons why a work based on + * this file might be covered by the GNU General Public License. + */ + +#include <common.h> +#include <serial.h> + +#if defined(CONFIG_CPU_V6) +/* + * ARMV6 + */ +#define DCC_RBIT (1 << 30) +#define DCC_WBIT (1 << 29) + +#define write_dcc(x) \ + __asm__ volatile ("mcr p14, 0, %0, c0, c5, 0\n" : : "r" (x)) + +#define read_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c0, c5, 0\n" : "=r" (x)) + +#define status_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c0, c1, 0\n" : "=r" (x)) + +#elif defined(CONFIG_CPU_XSCALE) +/* + * XSCALE + */ +#define DCC_RBIT (1 << 31) +#define DCC_WBIT (1 << 28) + +#define write_dcc(x) \ + __asm__ volatile ("mcr p14, 0, %0, c8, c0, 0\n" : : "r" (x)) + +#define read_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c9, c0, 0\n" : "=r" (x)) + +#define status_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c14, c0, 0\n" : "=r" (x)) + +#else +#define DCC_RBIT (1 << 0) +#define DCC_WBIT (1 << 1) + +#define write_dcc(x) \ + __asm__ volatile ("mcr p14, 0, %0, c1, c0, 0\n" : : "r" (x)) + +#define read_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c1, c0, 0\n" : "=r" (x)) + +#define status_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c0, c0, 0\n" : "=r" (x)) + +#endif + +#define can_read_dcc(x) do { \ + status_dcc(x); \ + x &= DCC_RBIT; \ + } while (0); + +#define can_write_dcc(x) do { \ + status_dcc(x); \ + x &= DCC_WBIT; \ + x = (x == 0); \ + } while (0); + +#define TIMEOUT_COUNT 0x4000000 + +static int arm_dcc_init(void) +{ + return 0; +} + +static int arm_dcc_getc(void) +{ + int ch; + register unsigned int reg; + + do { + can_read_dcc(reg); + } while (!reg); + read_dcc(ch); + + return ch; +} + +static void arm_dcc_putc(char ch) +{ + register unsigned int reg; + unsigned int timeout_count = TIMEOUT_COUNT; + + while (--timeout_count) { + can_write_dcc(reg); + if (reg) + break; + } + if (timeout_count == 0) + return; + else + write_dcc(ch); +} + +static int arm_dcc_tstc(void) +{ + register unsigned int reg; + + can_read_dcc(reg); + + return reg; +} + +static void arm_dcc_setbrg(void) +{ +} + +static struct serial_device arm_dcc_drv = { + .name = "arm_dcc", + .start = arm_dcc_init, + .stop = NULL, + .setbrg = arm_dcc_setbrg, + .putc = arm_dcc_putc, + .puts = default_serial_puts, + .getc = arm_dcc_getc, + .tstc = arm_dcc_tstc, +}; + +void arm_dcc_initialize(void) +{ + serial_register(&arm_dcc_drv); +} + +__weak struct serial_device *default_serial_console(void) +{ + return &arm_dcc_drv; +} |