src/soc/intel/baytrail/gpio.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2013 Google Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <baytrail/gpio.h>
#include <device/pci.h>
#include <console/console.h>

/* GPIO-to-Pad LUTs */
static const u8 gpncore_gpio_to_pad[GPNCORE_COUNT] =
        { 25, 24, 23, 32, 33, 34, 36, 37, 35, 22,
          20, 21, 18, 38, 39,  1,  4,  8, 17,  0,
           3,  6, 16, 19,  2,  5,  9 };

static const u8 gpscore_gpio_to_pad[GPSCORE_COUNT] =
        { 85,  89, 93, 96,  99, 102,  98, 101, 34,  37,
          36,  38, 39, 35,  40,  84,  62,  61, 64,  59,
          54,  56, 60, 55,  63,  57,  51,  50, 53,  47,
          52,  49, 48, 43,  46,  41,  45,  42, 58,  44,
          95, 105, 70, 68,  67,  66,  69,  71, 65,  72,
          86,  90, 88, 92, 103,  77,  79,  83, 78,  81,
          80,  82, 13, 12,  15,  14,  17,  18, 19,  16,
           2,   1,  0,  4,   6,   7,   9,   8, 33,  32,
          31,  30, 29, 27,  25,  28,  26,  23, 21,  20,
          24,  22,  5,  3,  10,  11, 106,  87, 91, 104,
          97, 100 };

static const u8 gpssus_gpio_to_pad[GPSSUS_COUNT] =
        { 29, 33, 30, 31, 32, 34, 36, 35, 38, 37,
          18,  7, 11, 20, 17,  1,  8, 10, 19, 12,
           0,  2, 23, 39, 28, 27, 22, 21, 24, 25,
          26, 51, 56, 54, 49, 55, 48, 57, 50, 58,
          52, 53, 59, 40 };

/* GPIO bank descriptions */
static const struct gpio_bank gpncore_bank = {
        .gpio_count = GPNCORE_COUNT,
        .gpio_to_pad = gpncore_gpio_to_pad,
        .legacy_base = GP_LEGACY_BASE_NONE,
        .pad_base = GPNCORE_PAD_BASE,
        .has_wake_en = 0,
};

static const struct gpio_bank gpscore_bank = {
        .gpio_count = GPSCORE_COUNT,
        .gpio_to_pad = gpscore_gpio_to_pad,
        .legacy_base = GPSCORE_LEGACY_BASE,
        .pad_base = GPSCORE_PAD_BASE,
        .has_wake_en = 0,
};

static const struct gpio_bank gpssus_bank = {
        .gpio_count = GPSSUS_COUNT,
        .gpio_to_pad = gpssus_gpio_to_pad,
        .legacy_base = GPSSUS_LEGACY_BASE,
        .pad_base = GPSSUS_PAD_BASE,
        .has_wake_en = 1,
};

static void setup_gpios(const struct soc_gpio_map *gpios,
			const struct gpio_bank *bank)
{
	const struct soc_gpio_map *config;
	int gpio = 0;
	u32 reg;
	u8 set, bit;

	u32 use_sel[4] = {0};
	u32 io_sel[4] = {0};
	u32 gp_lvl[4] = {0};
	u32 tpe[4] = {0};
	u32 tne[4] = {0};
	u32 wake_en[4] = {0};

	if (!gpios)
		return;

	for (config = gpios; config->pad_conf0 != GPIO_LIST_END;
	     config++, gpio++) {
		if (gpio > bank->gpio_count)
			break;

		set = gpio >> 5;
		bit = gpio % 32;

		if (bank->legacy_base != GP_LEGACY_BASE_NONE) {
			/* Legacy IO configuration */
			use_sel[set] |= config->use_sel << bit;
			io_sel[set]  |= config->io_sel  << bit;
			gp_lvl[set]  |= config->gp_lvl  << bit;
			tpe[set]     |= config->tpe     << bit;
			tne[set]     |= config->tne     << bit;

			/* Some banks do not have wake_en ability */
			if (bank->has_wake_en)
				wake_en[set] |= config->wake_en << bit;
		}

		/* Pad configuration registers */
		reg = bank->pad_base + 16 * bank->gpio_to_pad[gpio];

#ifdef GPIO_DEBUG
		printk(BIOS_DEBUG, "Write Pad: Base(%x) - %x %x %x\n",
		       reg, config->pad_conf0, config->pad_conf1,
		       config->pad_val );
#endif

		write32(reg + PAD_CONF0_REG, config->pad_conf0);
		write32(reg + PAD_CONF1_REG, config->pad_conf1);
		write32(reg + PAD_VAL_REG, config->pad_val);
	}

	if (bank->legacy_base != GP_LEGACY_BASE_NONE)
		for (set = 0; set <= (bank->gpio_count - 1) / 32; ++set) {
			reg = bank->legacy_base + 0x20 * set;

#ifdef GPIO_DEBUG
			printk(BIOS_DEBUG,
			       "Write GPIO: Reg(%x) - %x %x %x %x %x\n",
				reg, use_sel[set], io_sel[set], gp_lvl[set],
				tpe[set], tne[set]);
#endif

			outl(use_sel[set], reg + LEGACY_USE_SEL_REG);
			outl(io_sel[set], reg + LEGACY_IO_SEL_REG);
			outl(gp_lvl[set], reg + LEGACY_GP_LVL_REG);
			outl(tpe[set], reg + LEGACY_TPE_REG);
			outl(tne[set], reg + LEGACY_TNE_REG);

			/* TS registers are WOC  */
			outl(0, reg + LEGACY_TS_REG);

			if (bank->has_wake_en)
				outl(wake_en[set], reg + LEGACY_WAKE_EN_REG);
		}
}

void setup_soc_gpios(struct soc_gpio_config *config)
{
	if (config) {
		setup_gpios(config->ncore, &gpncore_bank);
		setup_gpios(config->score, &gpscore_bank);
		setup_gpios(config->ssus,  &gpssus_bank);
	}
}

struct soc_gpio_config* __attribute__((weak)) mainboard_get_gpios(void)
{
	printk(BIOS_DEBUG, "Default/empty GPIO config\n");
	return NULL;
}