From 509bf85036b3c345f832558a299257effabba108 Mon Sep 17 00:00:00 2001
From: aqua <aqua@iserlohn-fortress.net>
Date: Wed, 2 Nov 2022 23:09:18 +0200
Subject: fix compiler warnings

---
 devices/uart_16550.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'devices/uart_16550.c')

diff --git a/devices/uart_16550.c b/devices/uart_16550.c
index 7cec968..22f33ad 100644
--- a/devices/uart_16550.c
+++ b/devices/uart_16550.c
@@ -1,6 +1,47 @@
 #include "uart_16550.h"
 #include <sys/io.h>
 
+enum uart_16550_offset {
+  Data = 0,             // read from receive buffer / write to transmit buffer | BaudDiv_l
+  InterruptControl = 1, // interrupt enable | BaudDiv_h
+  FifoControl = 2,      // interrupt ID and FIFO control
+  LineControl = 3,      // most significant bit is the DLAB
+  ModemControl = 4,
+  LineStatus = 5,
+  ModemStatus = 6,
+  Scratch = 7,
+};
+// Line Control
+// | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
+// |dla|   | parity    | s | data  |
+
+enum LineControl {
+  d5bit = 0x00, // 0000 0000  data bits
+  d6bit = 0x01, // 0000 0001
+  d7bit = 0x02, // 0000 0010
+  d8bit = 0x03, // 0000 0011
+  // none = 0b00000000, // parity bits
+  odd = 0x08,   // 0000 1000
+  even = 0x18,  // 0001 1000
+  mark = 0x28,  // 0010 1000
+  space = 0x38, // 0011 1000
+  // s1bit = 0b00000000, // stop bits
+  s2bit = 0x04, // 0000 0100  1.5 for 5bit data; 2 otherwise
+  dlab = 0x80   // 1000 0000  divisor latch access bit
+};
+
+// Line Status Register
+enum LineStatus {
+  DR = (1 << 0),   // data ready: see if there is data to read
+  OE = (1 << 1),   // overrun error: see if there has been data lost
+  PE = (1 << 2),   // parity error: see if there was error in transmission
+  FE = (1 << 3),   // framing error: see if a stop bit was missing
+  BI = (1 << 4),   // break indicator: see if there is a break in data input
+  THRE = (1 << 5), // transmitter holding register empty: see if transmission buffer is empty
+  TEMT = (1 << 6), // transmitter empty: see if transmitter is not doing anything
+  ERRO = (1 << 7), // impending error: see if there is an error with a word in the input buffer
+};
+
 int
 uart_init(enum UART port)
 {
-- 
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