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https://github.com/edk2-porting/linux-next.git
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d58577d8f3
The following changes add processing to initialize the Xilinx 16550 UART in the boot wrapper for Virtex targets without firmware. Normally the boot wrapper assumes that the serial port has already been initialized by firmware. The wrapper was also modified to add the 440 build. Signed-off-by: John Linn <john.linn@xilinx.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
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* The simple platform -- for booting when firmware doesn't supply a device
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* tree or any platform configuration information.
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* All data is extracted from an embedded device tree
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* blob.
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*
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* Authors: Scott Wood <scottwood@freescale.com>
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* Grant Likely <grant.likely@secretlab.ca>
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*
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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* Copyright (c) 2008 Secret Lab Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "ops.h"
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#include "types.h"
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#include "io.h"
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#include "stdio.h"
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#include "libfdt/libfdt.h"
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BSS_STACK(4*1024);
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extern int platform_specific_init(void) __attribute__((weak));
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void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7)
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{
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const u32 *na, *ns, *reg, *timebase;
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u64 memsize64;
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int node, size, i;
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/* Make sure FDT blob is sane */
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if (fdt_check_header(_dtb_start) != 0)
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fatal("Invalid device tree blob\n");
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/* Find the #address-cells and #size-cells properties */
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node = fdt_path_offset(_dtb_start, "/");
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if (node < 0)
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fatal("Cannot find root node\n");
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na = fdt_getprop(_dtb_start, node, "#address-cells", &size);
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if (!na || (size != 4))
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fatal("Cannot find #address-cells property");
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ns = fdt_getprop(_dtb_start, node, "#size-cells", &size);
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if (!ns || (size != 4))
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fatal("Cannot find #size-cells property");
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/* Find the memory range */
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node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
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"memory", sizeof("memory"));
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if (node < 0)
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fatal("Cannot find memory node\n");
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reg = fdt_getprop(_dtb_start, node, "reg", &size);
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if (size < (*na+*ns) * sizeof(u32))
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fatal("cannot get memory range\n");
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/* Only interested in memory based at 0 */
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for (i = 0; i < *na; i++)
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if (*reg++ != 0)
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fatal("Memory range is not based at address 0\n");
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/* get the memsize and trucate it to under 4G on 32 bit machines */
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memsize64 = 0;
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for (i = 0; i < *ns; i++)
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memsize64 = (memsize64 << 32) | *reg++;
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if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL)
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memsize64 = 0xffffffff;
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/* finally, setup the timebase */
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node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
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"cpu", sizeof("cpu"));
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if (!node)
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fatal("Cannot find cpu node\n");
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timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
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if (timebase && (size == 4))
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timebase_period_ns = 1000000000 / *timebase;
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/* Now we have the memory size; initialize the heap */
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simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64);
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/* prepare the device tree and find the console */
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fdt_init(_dtb_start);
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if (platform_specific_init)
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platform_specific_init();
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serial_console_init();
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}
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