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microwatt/lib/console.c

224 lines
4.1 KiB
C

#include <stdint.h>
#include <stdbool.h>
#include "console.h"
#include "microwatt_soc.h"
#include "io.h"
#define UART_BAUDS 115200
/*
* Core UART functions to implement for a port
*/
bool uart_is_std;
static uint64_t uart_base;
static unsigned long uart_divisor(unsigned long uart_freq, unsigned long bauds)
{
return uart_freq / (bauds * 16);
}
static uint64_t potato_uart_reg_read(int offset)
{
return readq(uart_base + offset);
}
static void potato_uart_reg_write(int offset, uint64_t val)
{
writeq(val, uart_base + offset);
}
static int potato_uart_rx_empty(void)
{
uint64_t val;
val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);
if (val & POTATO_CONSOLE_STATUS_RX_EMPTY)
return 1;
return 0;
}
static int potato_uart_tx_full(void)
{
uint64_t val;
val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);
if (val & POTATO_CONSOLE_STATUS_TX_FULL)
return 1;
return 0;
}
static char potato_uart_read(void)
{
uint64_t val;
val = potato_uart_reg_read(POTATO_CONSOLE_RX);
return (char)(val & 0x000000ff);
}
static void potato_uart_write(char c)
{
uint64_t val;
val = c;
potato_uart_reg_write(POTATO_CONSOLE_TX, val);
}
static void potato_uart_init(uint64_t uart_freq)
{
unsigned long div = uart_divisor(uart_freq, UART_BAUDS) - 1;
potato_uart_reg_write(POTATO_CONSOLE_CLOCK_DIV, div);
}
static void potato_uart_set_irq_en(bool rx_irq, bool tx_irq)
{
uint64_t en = 0;
if (rx_irq)
en |= POTATO_CONSOLE_IRQ_RX;
if (tx_irq)
en |= POTATO_CONSOLE_IRQ_TX;
potato_uart_reg_write(POTATO_CONSOLE_IRQ_EN, en);
}
static bool std_uart_rx_empty(void)
{
return !(readb(uart_base + UART_REG_LSR) & UART_REG_LSR_DR);
}
static uint8_t std_uart_read(void)
{
return readb(uart_base + UART_REG_RX);
}
static bool std_uart_tx_full(void)
{
return !(readb(uart_base + UART_REG_LSR) & UART_REG_LSR_THRE);
}
static void std_uart_write(uint8_t c)
{
writeb(c, uart_base + UART_REG_TX);
}
static void std_uart_set_irq_en(bool rx_irq, bool tx_irq)
{
uint8_t ier = 0;
if (tx_irq)
ier |= UART_REG_IER_THRI;
if (rx_irq)
ier |= UART_REG_IER_RDI;
writeb(ier, uart_base + UART_REG_IER);
}
static void std_uart_init(uint64_t uart_freq)
{
unsigned long div = uart_divisor(uart_freq, UART_BAUDS);
writeb(UART_REG_LCR_DLAB, uart_base + UART_REG_LCR);
writeb(div & 0xff, uart_base + UART_REG_DLL);
writeb(div >> 8, uart_base + UART_REG_DLM);
writeb(UART_REG_LCR_8BIT, uart_base + UART_REG_LCR);
writeb(UART_REG_MCR_DTR |
UART_REG_MCR_RTS, uart_base + UART_REG_MCR);
writeb(UART_REG_FCR_EN_FIFO |
UART_REG_FCR_CLR_RCVR |
UART_REG_FCR_CLR_XMIT, uart_base + UART_REG_FCR);
}
int getchar(void)
{
if (uart_is_std) {
while (std_uart_rx_empty())
/* Do nothing */ ;
return std_uart_read();
} else {
while (potato_uart_rx_empty())
/* Do nothing */ ;
return potato_uart_read();
}
}
int putchar(int c)
{
if (uart_is_std) {
while(std_uart_tx_full())
/* Do Nothing */;
std_uart_write(c);
} else {
while (potato_uart_tx_full())
/* Do Nothing */;
potato_uart_write(c);
}
return c;
}
int puts(const char *str)
{
unsigned int i;
for (i = 0; *str; i++) {
char c = *(str++);
if (c == 10)
putchar(13);
putchar(c);
}
return 0;
}
#ifndef __USE_LIBC
size_t strlen(const char *s)
{
size_t len = 0;
while (*s++)
len++;
return len;
}
#endif
void console_init(void)
{
uint64_t sys_info;
uint64_t proc_freq;
uint64_t uart_info = 0;
uint64_t uart_freq = 0;
proc_freq = readq(SYSCON_BASE + SYS_REG_CLKINFO) & SYS_REG_CLKINFO_FREQ_MASK;
sys_info = readq(SYSCON_BASE + SYS_REG_INFO);
if (sys_info & SYS_REG_INFO_HAS_LARGE_SYSCON) {
uart_info = readq(SYSCON_BASE + SYS_REG_UART0_INFO);
uart_freq = uart_info & 0xffffffff;
}
if (uart_freq == 0)
uart_freq = proc_freq;
uart_base = UART_BASE;
if (uart_info & SYS_REG_UART_IS_16550) {
uart_is_std = true;
std_uart_init(proc_freq);
} else {
uart_is_std = false;
potato_uart_init(proc_freq);
}
}
void console_set_irq_en(bool rx_irq, bool tx_irq)
{
if (uart_is_std)
std_uart_set_irq_en(rx_irq, tx_irq);
else
potato_uart_set_irq_en(rx_irq, tx_irq);
}