e2f17f782f
Merge the different coreboot table strapping ID structures into one because they're really just all the same, and I want to add more. Make the signature of the board_id() function return a uint32_t because that's also what goes in the coreboot table. Add a printk to the generic code handling strapping IDs in ramstage so that not every individual mainboard implementation needs its own print. (In turn, remove one such print from fsp1_1 code because it's in the way of my next patch.) Change-Id: Ib9563edf07b623a586a4dc168fe357564c5e68b5 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/22741 Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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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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#include <boardid.h>
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#include <gpio.h>
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#include <console/console.h>
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#include <stdlib.h>
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/*
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* Storm boards dedicate to the board ID three GPIOs in tertiary mode: 29, 30
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* and 68. On proto0 GPIO68 is used and tied low, so it reads as 'zero' by
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* gpio_base3_value(), whereas the other two pins are not connected
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* and read as 'two'. This results in gpio_base3_value() returning
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* 8 on proto0.
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*
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* Three tertitiary signals could represent 27 different values. To make
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* calculated board ID value continuous and starting at zero, offset the
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* calculated value by 19 (i.e. 27 - 8) and return modulo 27 of the offset
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* number. This results in proto0 returning zero as the board ID, the future
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* revisions will have the inputs configured to match the actual board
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* revision.
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*/
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static int board_id_value = -1;
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static uint8_t get_board_id(void)
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{
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uint8_t bid;
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gpio_t hw_rev_gpios[] = {[2] = 68, [1] = 30, [0] = 29}; /* 29 is LSB */
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int offset = 19;
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bid = gpio_base3_value(hw_rev_gpios, ARRAY_SIZE(hw_rev_gpios));
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bid = (bid + offset) % 27;
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printk(BIOS_INFO, "Board ID %d\n", bid);
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return bid;
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}
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uint32_t board_id(void)
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{
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if (board_id_value < 0)
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board_id_value = get_board_id();
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return board_id_value;
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}
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