13f66507af
MMIO operations are arch-agnostic so the include path should not be arch/. Change-Id: I0fd70f5aeca02e98e96b980c3aca0819f5c44b98 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/31691 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2015 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 <device/mmio.h>
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#include <console/console.h>
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#include <device/i2c_simple.h>
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#include <gpio.h>
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#include <soc/grf.h>
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#include <soc/i2c.h>
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#include <soc/pmu.h>
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static struct {
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gpio_t scl;
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gpio_t sda;
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} pins[] = {
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[0]{.scl = GPIO(0, C, 0), .sda = GPIO(0, B, 7)},
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[1]{.scl = GPIO(8, A, 5), .sda = GPIO(8, A, 4)},
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[2]{.scl = GPIO(6, B, 2), .sda = GPIO(6, B, 1)},
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[3]{.scl = GPIO(2, C, 0), .sda = GPIO(2, C, 1)},
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[4]{.scl = GPIO(7, C, 2), .sda = GPIO(7, C, 1)},
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[5]{.scl = GPIO(7, C, 4), .sda = GPIO(7, C, 3)},
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};
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static int get_scl(unsigned bus)
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{
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return gpio_get(pins[bus].scl);
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}
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static int get_sda(unsigned bus)
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{
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return gpio_get(pins[bus].sda);
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}
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static void set_scl(unsigned bus, int high)
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{
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if (high)
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gpio_input_pullup(pins[bus].scl);
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else
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gpio_output(pins[bus].scl, 0);
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}
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static void set_sda(unsigned bus, int high)
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{
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if (high)
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gpio_input_pullup(pins[bus].sda);
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else
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gpio_output(pins[bus].sda, 0);
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}
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static struct software_i2c_ops rk_ops = {
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.get_scl = get_scl,
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.get_sda = get_sda,
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.set_scl = set_scl,
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.set_sda = set_sda,
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};
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void software_i2c_attach(unsigned bus)
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{
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software_i2c[bus] = &rk_ops;
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/* Mux pins to GPIO function for software I2C emulation. */
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switch (bus) {
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case 0:
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clrbits_le32(&rk3288_pmu->iomux_i2c0scl, IOMUX_I2C0SCL);
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clrbits_le32(&rk3288_pmu->iomux_i2c0sda, IOMUX_I2C0SDA);
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break;
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case 1:
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write32(&rk3288_grf->iomux_i2c1, IOMUX_GPIO(IOMUX_I2C1));
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break;
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case 2:
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write32(&rk3288_grf->iomux_i2c2, IOMUX_GPIO(IOMUX_I2C2));
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break;
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case 3:
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write32(&rk3288_grf->iomux_i2c3, IOMUX_GPIO(IOMUX_I2C3));
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break;
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case 4:
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write32(&rk3288_grf->iomux_i2c4, IOMUX_GPIO(IOMUX_I2C4));
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break;
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case 5:
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write32(&rk3288_grf->iomux_i2c5scl, IOMUX_GPIO(IOMUX_I2C5SCL));
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write32(&rk3288_grf->iomux_i2c5sda, IOMUX_GPIO(IOMUX_I2C5SDA));
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break;
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default:
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die("Unknown I2C bus number!");
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}
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/* Initialize bus to idle state. */
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set_scl(bus, 1);
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set_sda(bus, 1);
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}
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void software_i2c_detach(unsigned bus)
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{
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software_i2c[bus] = NULL;
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/* Mux pins back to hardware I2C controller. */
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switch (bus) {
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case 0:
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setbits_le32(&rk3288_pmu->iomux_i2c0scl, IOMUX_I2C0SCL);
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setbits_le32(&rk3288_pmu->iomux_i2c0sda, IOMUX_I2C0SDA);
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break;
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case 1:
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write32(&rk3288_grf->iomux_i2c1, IOMUX_I2C1);
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break;
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case 2:
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write32(&rk3288_grf->iomux_i2c2, IOMUX_I2C2);
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break;
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case 3:
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write32(&rk3288_grf->iomux_i2c3, IOMUX_I2C3);
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break;
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case 4:
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write32(&rk3288_grf->iomux_i2c4, IOMUX_I2C4);
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break;
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case 5:
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write32(&rk3288_grf->iomux_i2c5scl, IOMUX_I2C5SCL);
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write32(&rk3288_grf->iomux_i2c5sda, IOMUX_I2C5SDA);
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break;
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default:
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die("Unknown I2C bus number!");
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}
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}
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