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MIPS: ath79: Add early printk support for the AR933X SoCs 

The AR933X SoCs are using a different UART, thus require
different code for early printk support.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: Kathy Giori <kgiori@qca.qualcomm.com>
Cc: "Luis R.  Rodriguez" <rodrigue@qca.qualcomm.com>
Patchwork: https://patchwork.linux-mips.org/patch/2521/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Gabor Juhos 2011-06-20 21:26:03 +02:00 committed by Ralf Baechle
parent 6d1c8fde2d
commit 0bd3acdf7d
3 changed files with 137 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
arch/mips/ath79/early_printk.c
View File

@ -1,7 +1,7 @@
/*
* Atheros AR71XX/AR724X/AR913X SoC early printk support
* Atheros AR7XXX/AR9XXX SoC early printk support
*
* Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
@ -10,27 +10,85 @@
*/
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/serial_reg.h>
#include <asm/addrspace.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include <asm/mach-ath79/ar933x_uart.h>
static inline void prom_wait_thre(void __iomem *base)
static void (*_prom_putchar) (unsigned char);
static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val)
{
u32 lsr;
u32 t;
do {
lsr = __raw_readl(base + UART_LSR * 4);
if (lsr & UART_LSR_THRE)
t = __raw_readl(reg);
if ((t & mask) == val)
break;
} while (1);
}
void prom_putchar(unsigned char ch)
static void prom_putchar_ar71xx(unsigned char ch)
{
void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
prom_wait_thre(base);
prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
__raw_writel(ch, base + UART_TX * 4);
prom_wait_thre(base);
prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
}
static void prom_putchar_ar933x(unsigned 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 | 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(unsigned char ch)
{
/* nothing to do */
}
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:
_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;
break;
}
}
void prom_putchar(unsigned char ch)
{
if (!_prom_putchar)
prom_putchar_init();
_prom_putchar(ch);
}

3
arch/mips/include/asm/mach-ath79/ar71xx_regs.h
View File

@ -53,6 +53,9 @@
#define AR913X_WMAC_BASE (AR71XX_APB_BASE + 0x000C0000)
#define AR913X_WMAC_SIZE 0x30000
#define AR933X_UART_BASE (AR71XX_APB_BASE + 0x00020000)
#define AR933X_UART_SIZE 0x14
/*
* DDR_CTRL block
*/

67
arch/mips/include/asm/mach-ath79/ar933x_uart.h Normal file
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@ -0,0 +1,67 @@
/*
* Atheros AR933X UART defines
*
* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#ifndef __AR933X_UART_H
#define __AR933X_UART_H
#define AR933X_UART_REGS_SIZE 20
#define AR933X_UART_FIFO_SIZE 16
#define AR933X_UART_DATA_REG 0x00
#define AR933X_UART_CS_REG 0x04
#define AR933X_UART_CLOCK_REG 0x08
#define AR933X_UART_INT_REG 0x0c
#define AR933X_UART_INT_EN_REG 0x10
#define AR933X_UART_DATA_TX_RX_MASK 0xff
#define AR933X_UART_DATA_RX_CSR BIT(8)
#define AR933X_UART_DATA_TX_CSR BIT(9)
#define AR933X_UART_CS_PARITY_S 0
#define AR933X_UART_CS_PARITY_M 0x3
#define AR933X_UART_CS_PARITY_NONE 0
#define AR933X_UART_CS_PARITY_ODD 1
#define AR933X_UART_CS_PARITY_EVEN 2
#define AR933X_UART_CS_IF_MODE_S 2
#define AR933X_UART_CS_IF_MODE_M 0x3
#define AR933X_UART_CS_IF_MODE_NONE 0
#define AR933X_UART_CS_IF_MODE_DTE 1
#define AR933X_UART_CS_IF_MODE_DCE 2
#define AR933X_UART_CS_FLOW_CTRL_S 4
#define AR933X_UART_CS_FLOW_CTRL_M 0x3
#define AR933X_UART_CS_DMA_EN BIT(6)
#define AR933X_UART_CS_TX_READY_ORIDE BIT(7)
#define AR933X_UART_CS_RX_READY_ORIDE BIT(8)
#define AR933X_UART_CS_TX_READY BIT(9)
#define AR933X_UART_CS_RX_BREAK BIT(10)
#define AR933X_UART_CS_TX_BREAK BIT(11)
#define AR933X_UART_CS_HOST_INT BIT(12)
#define AR933X_UART_CS_HOST_INT_EN BIT(13)
#define AR933X_UART_CS_TX_BUSY BIT(14)
#define AR933X_UART_CS_RX_BUSY BIT(15)
#define AR933X_UART_CLOCK_STEP_M 0xffff
#define AR933X_UART_CLOCK_SCALE_M 0xfff
#define AR933X_UART_CLOCK_SCALE_S 16
#define AR933X_UART_CLOCK_STEP_M 0xffff
#define AR933X_UART_INT_RX_VALID BIT(0)
#define AR933X_UART_INT_TX_READY BIT(1)
#define AR933X_UART_INT_RX_FRAMING_ERR BIT(2)
#define AR933X_UART_INT_RX_OFLOW_ERR BIT(3)
#define AR933X_UART_INT_TX_OFLOW_ERR BIT(4)
#define AR933X_UART_INT_RX_PARITY_ERR BIT(5)
#define AR933X_UART_INT_RX_BREAK_ON BIT(6)
#define AR933X_UART_INT_RX_BREAK_OFF BIT(7)
#define AR933X_UART_INT_RX_FULL BIT(8)
#define AR933X_UART_INT_TX_EMPTY BIT(9)
#define AR933X_UART_INT_ALLINTS 0x3ff
#endif /* __AR933X_UART_H */