31bac1375b
This will allow a future change to auto-detect which UART to use. Signed-off-by: Doug Anderson <dianders@chromium.org> [swarren: Extracted from a larger patch by Doug] Signed-off-by: Stephen Warren <swarren@nvidia.com> Tested-by: Doug Anderson <dianders@chromium.org> Acked-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Olof Johansson <olof@lixom.net>
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/*
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* arch/arm/mach-tegra/include/mach/uncompress.h
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*
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* Copyright (C) 2010 Google, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Author:
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* Colin Cross <ccross@google.com>
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* Erik Gilling <konkers@google.com>
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* Doug Anderson <dianders@chromium.org>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __MACH_TEGRA_UNCOMPRESS_H
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#define __MACH_TEGRA_UNCOMPRESS_H
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#include <linux/types.h>
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#include <linux/serial_reg.h>
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#include <mach/iomap.h>
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#define DEBUG_UART_SHIFT 2
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volatile u8 *uart;
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static void putc(int c)
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{
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if (uart == NULL)
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return;
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while (!(uart[UART_LSR << DEBUG_UART_SHIFT] & UART_LSR_THRE))
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barrier();
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uart[UART_TX << DEBUG_UART_SHIFT] = c;
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}
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static inline void flush(void)
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{
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}
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static inline void arch_decomp_setup(void)
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{
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volatile u32 *apb_misc = (volatile u32 *)TEGRA_APB_MISC_BASE;
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u32 chip, div;
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uart = (volatile u8 *)TEGRA_DEBUG_UART_BASE;
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if (uart == NULL)
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return;
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chip = (apb_misc[0x804 / 4] >> 8) & 0xff;
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if (chip == 0x20)
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div = 0x0075;
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else
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div = 0x00dd;
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uart[UART_LCR << DEBUG_UART_SHIFT] |= UART_LCR_DLAB;
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uart[UART_DLL << DEBUG_UART_SHIFT] = div & 0xff;
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uart[UART_DLM << DEBUG_UART_SHIFT] = div >> 8;
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uart[UART_LCR << DEBUG_UART_SHIFT] = 3;
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}
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static inline void arch_decomp_wdog(void)
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{
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}
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#endif
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