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/*
* NS16550 Serial Port
* originally from linux source (arch/ppc/boot/ns16550.h)
* modified slightly to
* have addresses as offsets from CFG_ISA_BASE
* added a few more definitions
* added prototypes for ns16550.c
* reduced no of com ports to 2
* modifications (c) Rob Taylor, Flying Pig Systems. 2000.
*/
#if (CFG_NS16550_REG_SIZE == 1)
struct NS16550 {
unsigned char rbr; /* 0 */
unsigned char ier; /* 1 */
unsigned char fcr; /* 2 */
unsigned char lcr; /* 3 */
unsigned char mcr; /* 4 */
unsigned char lsr; /* 5 */
unsigned char msr; /* 6 */
unsigned char scr; /* 7 */
} __attribute__ ((packed));
#elif (CFG_NS16550_REG_SIZE == 2)
struct NS16550 {
unsigned short rbr; /* 0 */
unsigned short ier; /* 1 */
unsigned short fcr; /* 2 */
unsigned short lcr; /* 3 */
unsigned short mcr; /* 4 */
unsigned short lsr; /* 5 */
unsigned short msr; /* 6 */
unsigned short scr; /* 7 */
} __attribute__ ((packed));
#elif (CFG_NS16550_REG_SIZE == 4)
struct NS16550 {
unsigned long rbr; /* 0 */
unsigned long ier; /* 1 */
unsigned long fcr; /* 2 */
unsigned long lcr; /* 3 */
unsigned long mcr; /* 4 */
unsigned long lsr; /* 5 */
unsigned long msr; /* 6 */
unsigned long scr; /* 7 */
} __attribute__ ((packed));
#elif (CFG_NS16550_REG_SIZE == -4)
struct NS16550 {
unsigned char rbr; /* 0 */
int pad1:24;
unsigned char ier; /* 1 */
int pad2:24;
unsigned char fcr; /* 2 */
int pad3:24;
unsigned char lcr; /* 3 */
int pad4:24;
unsigned char mcr; /* 4 */
int pad5:24;
unsigned char lsr; /* 5 */
int pad6:24;
unsigned char msr; /* 6 */
int pad7:24;
unsigned char scr; /* 7 */
int pad8:24;
} __attribute__ ((packed));
#else
#error "Please define NS16550 registers size."
#endif
#define thr rbr
#define iir fcr
#define dll rbr
#define dlm ier
typedef volatile struct NS16550 *NS16550_t;
#define FCR_FIFO_EN 0x01 /* Fifo enable */
#define FCR_RXSR 0x02 /* Receiver soft reset */
#define FCR_TXSR 0x04 /* Transmitter soft reset */
#define MCR_DTR 0x01
#define MCR_RTS 0x02
#define MCR_DMA_EN 0x04
#define MCR_TX_DFR 0x08
#define LCR_WLS_MSK 0x03 /* character length slect mask */
#define LCR_WLS_5 0x00 /* 5 bit character length */
#define LCR_WLS_6 0x01 /* 6 bit character length */
#define LCR_WLS_7 0x02 /* 7 bit character length */
#define LCR_WLS_8 0x03 /* 8 bit character length */
#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */
#define LCR_PEN 0x08 /* Parity eneble */
#define LCR_EPS 0x10 /* Even Parity Select */
#define LCR_STKP 0x20 /* Stick Parity */
#define LCR_SBRK 0x40 /* Set Break */
#define LCR_BKSE 0x80 /* Bank select enable */
#define LSR_DR 0x01 /* Data ready */
#define LSR_OE 0x02 /* Overrun */
#define LSR_PE 0x04 /* Parity error */
#define LSR_FE 0x08 /* Framing error */
#define LSR_BI 0x10 /* Break */
#define LSR_THRE 0x20 /* Xmit holding register empty */
#define LSR_TEMT 0x40 /* Xmitter empty */
#define LSR_ERR 0x80 /* Error */
/* useful defaults for LCR */
#define LCR_8N1 0x03
void NS16550_init (NS16550_t com_port, int baud_divisor);
void NS16550_putc (NS16550_t com_port, char c);
char NS16550_getc (NS16550_t com_port);
int NS16550_tstc (NS16550_t com_port);
void NS16550_reinit (NS16550_t com_port, int baud_divisor);
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