| /* |
| * (C) Copyright 2010 Quantenna Communications Inc. |
| * |
| * 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 "ruby.h" |
| |
| /*****************************************************************************/ |
| /* Ruby UART is compatible with NS16550, but provide extra functionality. */ |
| /* Let's have our own implementation, not uboot's generic NS16550. */ |
| /*****************************************************************************/ |
| |
| static int initialized = 0; |
| |
| inline static int serial_tx_ready(void) |
| { |
| return (readb(RUBY_UART0_LSR) & RUBY_LSR_TX_Empty); |
| } |
| |
| inline static int serial_rx_ready(void) |
| { |
| return (readb(RUBY_UART0_LSR) & RUBY_LSR_RX_Ready); |
| } |
| |
| inline static void serial_wait_tx(void) |
| { |
| while (!serial_tx_ready()); |
| } |
| |
| inline static void serial_wait_rx(void) |
| { |
| while (!serial_rx_ready()); |
| } |
| |
| inline static void serial_putc_simple(const char c) |
| { |
| serial_wait_tx(); |
| writeb(c, RUBY_UART0_RBR_THR_DLL); |
| } |
| |
| void serial_putc(const char c) |
| { |
| if (initialized) { |
| if (c == '\n') { |
| serial_putc_simple('\r'); |
| } |
| serial_putc_simple(c); |
| } |
| } |
| |
| int serial_getc(void) |
| { |
| int ret = 'X'; |
| if (initialized) { |
| serial_wait_rx(); |
| ret = readb(RUBY_UART0_RBR_THR_DLL); |
| } |
| return ret; |
| } |
| |
| int serial_tstc(void) |
| { |
| return initialized ? serial_rx_ready() : 0; |
| } |
| |
| void serial_puts(const char *s) |
| { |
| while (*s) { |
| serial_putc(*s++); |
| } |
| } |
| |
| int serial_tx_done(void) |
| { |
| return initialized ? (readb(RUBY_UART0_LSR) & RUBY_LSR_TX_Empty) : 1; |
| } |
| |
| void serial_setbrg(void) |
| { |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| u32 baud_val = (gd->baudrate * 16); |
| u32 div_val = (gd->bus_clk + baud_val / 2) / baud_val; |
| u8 lcr_val = |
| RUBY_LCR_Data_Word_Length_8 | |
| RUBY_LCR_Stop_Bit_1 | |
| RUBY_LCR_No_Parity | |
| RUBY_LCR_Break_Disable; |
| |
| if (!(readb(RUBY_UART0_USR) & RUBY_USR_Busy)) { |
| writeb(lcr_val | RUBY_LCR_DLAB, RUBY_UART0_LCR); |
| writeb((div_val & 0xff), RUBY_UART0_RBR_THR_DLL); |
| writeb((div_val >> 8) & 0xff, RUBY_UART0_DLH_IER); |
| writeb(lcr_val, RUBY_UART0_LCR); |
| } |
| } |
| |
| int serial_init(void) |
| { |
| return 0; |
| } |
| |
| void board_serial_init(void) |
| { |
| /* configure GPIOs */ |
| gpio_config(RUBY_GPIO_UART0_SO, RUBY_GPIO_ALT_OUTPUT); |
| gpio_config(RUBY_GPIO_UART0_SI, RUBY_GPIO_ALT_INPUT); |
| |
| /* configure baud-rate */ |
| serial_setbrg(); |
| |
| /* done */ |
| initialized = 1; |
| } |
| |