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Diffstat (limited to 'package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c')
| -rw-r--r-- | package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c b/package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c new file mode 100644 index 000000000..f09331895 --- /dev/null +++ b/package/uboot-ar71xx/files/cpu/mips/ar71xx_serial.c @@ -0,0 +1,177 @@ +/* + * (C) Copyright 2010 + * Michael Kurz <michi.kurz@googlemail.com>. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <asm/addrspace.h> +#include <asm/types.h> +#include <config.h> +#include <asm/ar71xx.h> + +#define REG_SIZE 4 + +/* === END OF CONFIG === */ + +/* register offset */ +#define OFS_RCV_BUFFER (0*REG_SIZE) +#define OFS_TRANS_HOLD (0*REG_SIZE) +#define OFS_SEND_BUFFER (0*REG_SIZE) +#define OFS_INTR_ENABLE (1*REG_SIZE) +#define OFS_INTR_ID (2*REG_SIZE) +#define OFS_DATA_FORMAT (3*REG_SIZE) +#define OFS_LINE_CONTROL (3*REG_SIZE) +#define OFS_MODEM_CONTROL (4*REG_SIZE) +#define OFS_RS232_OUTPUT (4*REG_SIZE) +#define OFS_LINE_STATUS (5*REG_SIZE) +#define OFS_MODEM_STATUS (6*REG_SIZE) +#define OFS_RS232_INPUT (6*REG_SIZE) +#define OFS_SCRATCH_PAD (7*REG_SIZE) + +#define OFS_DIVISOR_LSB (0*REG_SIZE) +#define OFS_DIVISOR_MSB (1*REG_SIZE) + +#define UART16550_READ(y) readl(KSEG1ADDR(AR71XX_UART_BASE+y)) +#define UART16550_WRITE(x, z) writel(z, KSEG1ADDR((AR71XX_UART_BASE+x))) + +void +ar71xx_sys_frequency(u32 *cpu_freq, u32 *ddr_freq, u32 *ahb_freq) +{ +#ifndef CONFIG_AR91XX + u32 pll, pll_div, cpu_div, ahb_div, ddr_div, freq; + + pll = readl(KSEG1ADDR(AR71XX_PLL_REG_CPU_CONFIG + AR71XX_PLL_BASE)); + + pll_div = + ((pll & AR71XX_PLL_DIV_MASK) >> AR71XX_PLL_DIV_SHIFT) + 1; + + cpu_div = + ((pll & AR71XX_CPU_DIV_MASK) >> AR71XX_CPU_DIV_SHIFT) + 1; + + ddr_div = + ((pll & AR71XX_DDR_DIV_MASK) >> AR71XX_DDR_DIV_SHIFT) + 1; + + ahb_div = + (((pll & AR71XX_AHB_DIV_MASK) >> AR71XX_AHB_DIV_SHIFT) + 1)*2; + + freq = pll_div * 40000000; + + if (cpu_freq) + *cpu_freq = freq/cpu_div; + + if (ddr_freq) + *ddr_freq = freq/ddr_div; + + if (ahb_freq) + *ahb_freq = (freq/cpu_div)/ahb_div; + +#else + u32 pll, pll_div, ahb_div, ddr_div, freq; + + pll = readl(KSEG1ADDR(AR91XX_PLL_REG_CPU_CONFIG + AR71XX_PLL_BASE)); + + pll_div = + ((pll & AR91XX_PLL_DIV_MASK) >> AR91XX_PLL_DIV_SHIFT); + + ddr_div = + ((pll & AR91XX_DDR_DIV_MASK) >> AR91XX_DDR_DIV_SHIFT) + 1; + + ahb_div = + (((pll & AR91XX_AHB_DIV_MASK) >> AR91XX_AHB_DIV_SHIFT) + 1)*2; + + freq = pll_div * 5000000; + + if (cpu_freq) + *cpu_freq = freq; + + if (ddr_freq) + *ddr_freq = freq/ddr_div; + + if (ahb_freq) + *ahb_freq = freq/ahb_div; +#endif +} + + +int serial_init(void) +{ + u32 div; + u32 ahb_freq = 100000000; + + ar71xx_sys_frequency (0, 0, &ahb_freq); + div = ahb_freq/(16 * CONFIG_BAUDRATE); + + // enable uart pins +#ifndef CONFIG_AR91XX + writel(AR71XX_GPIO_FUNC_UART_EN, KSEG1ADDR(AR71XX_GPIO_BASE + GPIO_REG_FUNC)); +#else + writel(AR91XX_GPIO_FUNC_UART_EN, KSEG1ADDR(AR71XX_GPIO_BASE + GPIO_REG_FUNC)); +#endif + + /* set DIAB bit */ + UART16550_WRITE(OFS_LINE_CONTROL, 0x80); + + /* set divisor */ + UART16550_WRITE(OFS_DIVISOR_LSB, (div & 0xff)); + UART16550_WRITE(OFS_DIVISOR_MSB, ((div >> 8) & 0xff)); + + /* clear DIAB bit*/ + UART16550_WRITE(OFS_LINE_CONTROL, 0x00); + + /* set data format */ + UART16550_WRITE(OFS_DATA_FORMAT, 0x3); + + UART16550_WRITE(OFS_INTR_ENABLE, 0); + + return 0; +} + +int serial_tstc (void) +{ + return(UART16550_READ(OFS_LINE_STATUS) & 0x1); +} + +int serial_getc(void) +{ + while(!serial_tstc()); + + return UART16550_READ(OFS_RCV_BUFFER); +} + + +void serial_putc(const char byte) +{ + if (byte == '\n') serial_putc ('\r'); + + while (((UART16550_READ(OFS_LINE_STATUS)) & 0x20) == 0x0); + UART16550_WRITE(OFS_SEND_BUFFER, byte); +} + +void serial_setbrg (void) +{ +} + +void serial_puts (const char *s) +{ + while (*s) + { + serial_putc (*s++); + } +} |