163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/*
|
|
* arch/arm/mach-tegra/include/mach/uncompress.h
|
|
*
|
|
* Copyright (C) 2010 Google, Inc.
|
|
* Copyright (C) 2011 Google, Inc.
|
|
* Copyright (C) 2011-2012 NVIDIA CORPORATION. All Rights Reserved.
|
|
*
|
|
* Author:
|
|
* Colin Cross <ccross@google.com>
|
|
* Erik Gilling <konkers@google.com>
|
|
* Doug Anderson <dianders@chromium.org>
|
|
* Stephen Warren <swarren@nvidia.com>
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#ifndef __MACH_TEGRA_UNCOMPRESS_H
|
|
#define __MACH_TEGRA_UNCOMPRESS_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/serial_reg.h>
|
|
|
|
#include <mach/iomap.h>
|
|
#include <mach/irammap.h>
|
|
|
|
#define BIT(x) (1 << (x))
|
|
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
|
|
|
|
#define DEBUG_UART_SHIFT 2
|
|
|
|
volatile u8 *uart;
|
|
|
|
static void putc(int c)
|
|
{
|
|
if (uart == NULL)
|
|
return;
|
|
|
|
while (!(uart[UART_LSR << DEBUG_UART_SHIFT] & UART_LSR_THRE))
|
|
barrier();
|
|
uart[UART_TX << DEBUG_UART_SHIFT] = c;
|
|
}
|
|
|
|
static inline void flush(void)
|
|
{
|
|
}
|
|
|
|
static inline void save_uart_address(void)
|
|
{
|
|
u32 *buf = (u32 *)(TEGRA_IRAM_BASE + TEGRA_IRAM_DEBUG_UART_OFFSET);
|
|
|
|
if (uart) {
|
|
buf[0] = TEGRA_IRAM_DEBUG_UART_COOKIE;
|
|
buf[1] = (u32)uart;
|
|
} else
|
|
buf[0] = 0;
|
|
}
|
|
|
|
/*
|
|
* Setup before decompression. This is where we do UART selection for
|
|
* earlyprintk and init the uart_base register.
|
|
*/
|
|
static inline void arch_decomp_setup(void)
|
|
{
|
|
static const struct {
|
|
u32 base;
|
|
u32 reset_reg;
|
|
u32 clock_reg;
|
|
u32 bit;
|
|
} uarts[] = {
|
|
{
|
|
TEGRA_UARTA_BASE,
|
|
TEGRA_CLK_RESET_BASE + 0x04,
|
|
TEGRA_CLK_RESET_BASE + 0x10,
|
|
6,
|
|
},
|
|
{
|
|
TEGRA_UARTB_BASE,
|
|
TEGRA_CLK_RESET_BASE + 0x04,
|
|
TEGRA_CLK_RESET_BASE + 0x10,
|
|
7,
|
|
},
|
|
{
|
|
TEGRA_UARTC_BASE,
|
|
TEGRA_CLK_RESET_BASE + 0x08,
|
|
TEGRA_CLK_RESET_BASE + 0x14,
|
|
23,
|
|
},
|
|
{
|
|
TEGRA_UARTD_BASE,
|
|
TEGRA_CLK_RESET_BASE + 0x0c,
|
|
TEGRA_CLK_RESET_BASE + 0x18,
|
|
1,
|
|
},
|
|
{
|
|
TEGRA_UARTE_BASE,
|
|
TEGRA_CLK_RESET_BASE + 0x0c,
|
|
TEGRA_CLK_RESET_BASE + 0x18,
|
|
2,
|
|
},
|
|
};
|
|
int i;
|
|
volatile u32 *apb_misc = (volatile u32 *)TEGRA_APB_MISC_BASE;
|
|
u32 chip, div;
|
|
|
|
/*
|
|
* Look for the first UART that:
|
|
* a) Is not in reset.
|
|
* b) Is clocked.
|
|
* c) Has a 'D' in the scratchpad register.
|
|
*
|
|
* Note that on Tegra30, the first two conditions are required, since
|
|
* if not true, accesses to the UART scratch register will hang.
|
|
* Tegra20 doesn't have this issue.
|
|
*
|
|
* The intent is that the bootloader will tell the kernel which UART
|
|
* to use by setting up those conditions. If nothing found, we'll fall
|
|
* back to what's specified in TEGRA_DEBUG_UART_BASE.
|
|
*/
|
|
for (i = 0; i < ARRAY_SIZE(uarts); i++) {
|
|
if (*(u8 *)uarts[i].reset_reg & BIT(uarts[i].bit))
|
|
continue;
|
|
|
|
if (!(*(u8 *)uarts[i].clock_reg & BIT(uarts[i].bit)))
|
|
continue;
|
|
|
|
uart = (volatile u8 *)uarts[i].base;
|
|
if (uart[UART_SCR << DEBUG_UART_SHIFT] != 'D')
|
|
continue;
|
|
|
|
break;
|
|
}
|
|
if (i == ARRAY_SIZE(uarts))
|
|
uart = (volatile u8 *)TEGRA_DEBUG_UART_BASE;
|
|
save_uart_address();
|
|
if (uart == NULL)
|
|
return;
|
|
|
|
chip = (apb_misc[0x804 / 4] >> 8) & 0xff;
|
|
if (chip == 0x20)
|
|
div = 0x0075;
|
|
else
|
|
div = 0x00dd;
|
|
|
|
uart[UART_LCR << DEBUG_UART_SHIFT] |= UART_LCR_DLAB;
|
|
uart[UART_DLL << DEBUG_UART_SHIFT] = div & 0xff;
|
|
uart[UART_DLM << DEBUG_UART_SHIFT] = div >> 8;
|
|
uart[UART_LCR << DEBUG_UART_SHIFT] = 3;
|
|
}
|
|
|
|
static inline void arch_decomp_wdog(void)
|
|
{
|
|
}
|
|
|
|
#endif
|