148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Atheros AR7XXX/AR9XXX SoC early printk support
|
|
*
|
|
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
|
|
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/serial_reg.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/setup.h>
|
|
|
|
#include <asm/mach-ath79/ath79.h>
|
|
#include <asm/mach-ath79/ar71xx_regs.h>
|
|
#include <asm/mach-ath79/ar933x_uart.h>
|
|
|
|
static void (*_prom_putchar)(char);
|
|
|
|
static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val)
|
|
{
|
|
u32 t;
|
|
|
|
do {
|
|
t = __raw_readl(reg);
|
|
if ((t & mask) == val)
|
|
break;
|
|
} while (1);
|
|
}
|
|
|
|
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
|
|
|
|
static void prom_putchar_ar71xx(char ch)
|
|
{
|
|
void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
|
|
|
|
prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
|
|
__raw_writel((unsigned char)ch, base + UART_TX * 4);
|
|
prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
|
|
}
|
|
|
|
static void prom_putchar_ar933x(char ch)
|
|
{
|
|
void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
|
|
|
|
prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
|
|
AR933X_UART_DATA_TX_CSR);
|
|
__raw_writel(AR933X_UART_DATA_TX_CSR | (unsigned char)ch,
|
|
base + AR933X_UART_DATA_REG);
|
|
prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
|
|
AR933X_UART_DATA_TX_CSR);
|
|
}
|
|
|
|
static void prom_putchar_dummy(char ch)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
static void prom_enable_uart(u32 id)
|
|
{
|
|
void __iomem *gpio_base;
|
|
u32 uart_en;
|
|
u32 t;
|
|
|
|
switch (id) {
|
|
case REV_ID_MAJOR_AR71XX:
|
|
uart_en = AR71XX_GPIO_FUNC_UART_EN;
|
|
break;
|
|
|
|
case REV_ID_MAJOR_AR7240:
|
|
case REV_ID_MAJOR_AR7241:
|
|
case REV_ID_MAJOR_AR7242:
|
|
uart_en = AR724X_GPIO_FUNC_UART_EN;
|
|
break;
|
|
|
|
case REV_ID_MAJOR_AR913X:
|
|
uart_en = AR913X_GPIO_FUNC_UART_EN;
|
|
break;
|
|
|
|
case REV_ID_MAJOR_AR9330:
|
|
case REV_ID_MAJOR_AR9331:
|
|
uart_en = AR933X_GPIO_FUNC_UART_EN;
|
|
break;
|
|
|
|
case REV_ID_MAJOR_AR9341:
|
|
case REV_ID_MAJOR_AR9342:
|
|
case REV_ID_MAJOR_AR9344:
|
|
/* TODO */
|
|
default:
|
|
return;
|
|
}
|
|
|
|
gpio_base = (void __iomem *)KSEG1ADDR(AR71XX_GPIO_BASE);
|
|
t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC);
|
|
t |= uart_en;
|
|
__raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC);
|
|
}
|
|
|
|
static void prom_putchar_init(void)
|
|
{
|
|
void __iomem *base;
|
|
u32 id;
|
|
|
|
base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
|
|
id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
|
|
id &= REV_ID_MAJOR_MASK;
|
|
|
|
switch (id) {
|
|
case REV_ID_MAJOR_AR71XX:
|
|
case REV_ID_MAJOR_AR7240:
|
|
case REV_ID_MAJOR_AR7241:
|
|
case REV_ID_MAJOR_AR7242:
|
|
case REV_ID_MAJOR_AR913X:
|
|
case REV_ID_MAJOR_AR9341:
|
|
case REV_ID_MAJOR_AR9342:
|
|
case REV_ID_MAJOR_AR9344:
|
|
case REV_ID_MAJOR_QCA9533:
|
|
case REV_ID_MAJOR_QCA9533_V2:
|
|
case REV_ID_MAJOR_QCA9556:
|
|
case REV_ID_MAJOR_QCA9558:
|
|
case REV_ID_MAJOR_TP9343:
|
|
case REV_ID_MAJOR_QCA956X:
|
|
case REV_ID_MAJOR_QCN550X:
|
|
_prom_putchar = prom_putchar_ar71xx;
|
|
break;
|
|
|
|
case REV_ID_MAJOR_AR9330:
|
|
case REV_ID_MAJOR_AR9331:
|
|
_prom_putchar = prom_putchar_ar933x;
|
|
break;
|
|
|
|
default:
|
|
_prom_putchar = prom_putchar_dummy;
|
|
return;
|
|
}
|
|
|
|
prom_enable_uart(id);
|
|
}
|
|
|
|
void prom_putchar(char ch)
|
|
{
|
|
if (!_prom_putchar)
|
|
prom_putchar_init();
|
|
|
|
_prom_putchar(ch);
|
|
}
|