ar100: Support for ar100 (#6054)

Add files to support AR100

Signed-off-by: Elias Bakken <elias@iagent.no>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/ar100/serial.c b/src/ar100/serial.c
new file mode 100644
index 00000000..6fcafdbd
--- /dev/null
+++ b/src/ar100/serial.c
@@ -0,0 +1,53 @@
+// Uart and r_uart functions for ar100
+//
+// Copyright (C) 2020-2021  Elias Bakken <elias@iagent.no>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+
+#include "serial.h"
+#include "util.h"
+#include "internal.h"
+#include "gpio.h"
+
+void r_uart_init(void){
+  // Setup Pins PL2, PL3 as UART IO
+  gpio_mux_setup(2, PIO_ALT1);
+  gpio_mux_setup(3, PIO_ALT1);
+
+  // Enable clock and assert reset
+  clear_bit(APB0_CLK_GATING_REG, 4);
+  set_bit(APB0_SOFT_RST_REG, 4);
+  set_bit(APB0_CLK_GATING_REG, 4);
+
+  // Setup baud rate
+  set_bit(R_UART_LCR, 7); // Enable setting DLH, DLL
+  write_reg(R_UART_DLH, 0x0);
+  write_reg(R_UART_DLL, 0xD); // 1 500 000
+  write_reg(R_UART_LCR, 0x3); // 8 bit data length
+
+  write_reg(R_UART_FCR, 0<<0); // Disable fifo
+  r_uart_getc(); // flush input
+  write_reg(R_UART_FCR, 1<<0); // Enable fifo
+}
+
+char r_uart_getc(void){
+  char c = (char) read_reg(R_UART_RBR);
+  return c;
+}
+
+uint32_t r_uart_fifo_rcv(void){
+  return read_reg(R_UART_RFL);
+}
+
+void r_uart_putc(char c){
+  while(!(read_reg(R_UART_LSR) & 1<<5))
+    ;
+  write_reg(R_UART_THR, c);
+}
+
+void r_uart_puts(char *s){
+  while(*s){
+    r_uart_putc(*s++);
+  }
+}