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/*
* 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>
*
* Copyright (C) 2010-2012 NVIDIA Corporation
*
* 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;
#if defined(CONFIG_TEGRA_DEBUG_UARTA)
#define DEBUG_UART_CLK_SRC (TEGRA_CLK_RESET_BASE + 0x178)
#define DEBUG_UART_CLK_ENB_SET_REG (TEGRA_CLK_RESET_BASE + 0x320)
#define DEBUG_UART_CLK_ENB_SET_BIT (1 << 6)
#define DEBUG_UART_RST_CLR_REG (TEGRA_CLK_RESET_BASE + 0x304)
#define DEBUG_UART_RST_CLR_BIT (1 << 6)
#elif defined(CONFIG_TEGRA_DEBUG_UARTB)
#define DEBUG_UART_CLK_SRC (TEGRA_CLK_RESET_BASE + 0x17c)
#define DEBUG_UART_CLK_ENB_SET_REG (TEGRA_CLK_RESET_BASE + 0x320)
#define DEBUG_UART_CLK_ENB_SET_BIT (1 << 7)
#define DEBUG_UART_RST_CLR_REG (TEGRA_CLK_RESET_BASE + 0x304)
#define DEBUG_UART_RST_CLR_BIT (1 << 7)
#elif defined(CONFIG_TEGRA_DEBUG_UARTC)
#define DEBUG_UART_CLK_SRC (TEGRA_CLK_RESET_BASE + 0x1a0)
#define DEBUG_UART_CLK_ENB_SET_REG (TEGRA_CLK_RESET_BASE + 0x328)
#define DEBUG_UART_CLK_ENB_SET_BIT (1 << 23)
#define DEBUG_UART_RST_CLR_REG (TEGRA_CLK_RESET_BASE + 0x30C)
#define DEBUG_UART_RST_CLR_BIT (1 << 23)
#elif defined(CONFIG_TEGRA_DEBUG_UARTD)
#define DEBUG_UART_CLK_SRC (TEGRA_CLK_RESET_BASE + 0x1c0)
#define DEBUG_UART_CLK_ENB_SET_REG (TEGRA_CLK_RESET_BASE + 0x330)
#define DEBUG_UART_CLK_ENB_SET_BIT (1 << 1)
#define DEBUG_UART_RST_CLR_REG (TEGRA_CLK_RESET_BASE + 0x314)
#define DEBUG_UART_RST_CLR_BIT (1 << 1)
#elif defined(CONFIG_TEGRA_DEBUG_UARTE)
#define DEBUG_UART_CLK_SRC (TEGRA_CLK_RESET_BASE + 0x1c4)
#define DEBUG_UART_CLK_ENB_SET_REG (TEGRA_CLK_RESET_BASE + 0x330)
#define DEBUG_UART_CLK_ENB_SET_BIT (1 << 2)
#define DEBUG_UART_RST_CLR_REG (TEGRA_CLK_RESET_BASE + 0x314)
#define DEBUG_UART_RST_CLR_BIT (1 << 2)
#else
#define DEBUG_UART_CLK_SRC 0
#define DEBUG_UART_CLK_ENB_SET_REG 0
#define DEBUG_UART_CLK_ENB_SET_BIT 0
#define DEBUG_UART_RST_CLR_REG 0
#define DEBUG_UART_RST_CLR_BIT 0
#endif
#define PLLP_BASE (TEGRA_CLK_RESET_BASE + 0x0a0)
#define PLLP_BASE_OVERRIDE (1 << 28)
#define PLLP_BASE_DIVP_SHIFT 20
#define PLLP_BASE_DIVP_MASK (0x7 << 20)
#define PLLP_BASE_DIVN_SHIFT 8
#define PLLP_BASE_DIVN_MASK (0x3FF << 8)
#define DEBUG_UART_DLL_216 0x75
#define DEBUG_UART_DLL_408 0xdd
#define DEBUG_UART_DLL_204 0x6f
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 konk_delay(int delay)
{
int i;
for (i = 0; i < (1000 * delay); i++) {
barrier();
}
}
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)
{
volatile u32 *addr;
u8 uart_dll = DEBUG_UART_DLL_216;
u32 val;
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;
/*
* 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;
/* Debug UART clock source is PLLP_OUT0. */
addr = (volatile u32 *)DEBUG_UART_CLK_SRC;
*addr = 0;
/* Enable clock to debug UART. */
addr = (volatile u32 *)DEBUG_UART_CLK_ENB_SET_REG;
*addr = DEBUG_UART_CLK_ENB_SET_BIT;
konk_delay(5);
/* Deassert reset to debug UART. */
addr = (volatile u32 *)DEBUG_UART_RST_CLR_REG;
*addr = DEBUG_UART_RST_CLR_BIT;
konk_delay(5);
/*
* On Tegra2 platforms PLLP always run at 216MHz
* On Tegra3 platforms PLLP can run at 216MHz, 204MHz, or 408MHz
* Discrimantion algorithm below assumes that PLLP is configured
* according to h/w recomendations with update rate 1MHz or 1.2MHz
* depending on oscillator frequency
*/
addr = (volatile u32 *)PLLP_BASE;
val = *addr;
if (val & PLLP_BASE_OVERRIDE) {
u32 p = (val & PLLP_BASE_DIVP_MASK) >> PLLP_BASE_DIVP_SHIFT;
val = (val & PLLP_BASE_DIVN_MASK) >> (PLLP_BASE_DIVN_SHIFT + p);
switch (val) {
case 170:
case 204:
uart_dll = DEBUG_UART_DLL_204;
break;
case 340:
case 408:
uart_dll = DEBUG_UART_DLL_408;
break;
case 180:
case 216:
default:
break;
}
}
/* Set up debug UART. */
uart[UART_LCR << DEBUG_UART_SHIFT] |= UART_LCR_DLAB;
uart[UART_DLL << DEBUG_UART_SHIFT] = uart_dll;
uart[UART_DLM << DEBUG_UART_SHIFT] = 0x0;
uart[UART_LCR << DEBUG_UART_SHIFT] = 3;
}
static inline void arch_decomp_wdog(void)
{
}
#endif
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