ec/kontron: Add support for Kontron kempld
A programmable logic device used by Kontron as EC on their COM express modules. The name `kempld` is taken from Linux kernel sources, as is the I2C driver. The meaning of the acronym is unclear, probably: Kontron Embedded Module PLD. Change-Id: If9a0826c4a8f5c8cd573610c2d10561334258b36 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/c/29476 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Nico Huber
Patrick Georgi
parent
b2e610011c
commit
016ef9e9bc
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@ -0,0 +1,5 @@
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config EC_KONTRON_KEMPLD
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bool
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help
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Driver for Kontron's express module programmable logic device used
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on their COMexpress modules.
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@ -0,0 +1,4 @@
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bootblock-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c
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ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c
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ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld.c
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ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld_i2c.c
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@ -0,0 +1,38 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2017 secunet Security Networks AG
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* 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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#ifndef EC_KONTRON_KEMPLD_CHIP_H
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#define EC_KONTRON_KEMPLD_CHIP_H
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#define KEMPLD_NUM_UARTS 2
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enum kempld_uart_io {
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KEMPLD_UART_3F8 = 0,
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KEMPLD_UART_2F8 = 1,
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KEMPLD_UART_3E8 = 2,
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KEMPLD_UART_2E8 = 3,
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};
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struct kempld_uart {
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enum kempld_uart_io io;
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unsigned int irq;
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};
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struct ec_kontron_kempld_config {
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struct kempld_uart uart[KEMPLD_NUM_UARTS];
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};
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#endif /* EC_KONTRON_KEMPLD_CHIP_H */
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@ -0,0 +1,72 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2017 secunet Security Networks AG
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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 <stdint.h>
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#include <arch/io.h>
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#include <delay.h>
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#include "chip.h"
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#include "kempld.h"
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#include "kempld_internal.h"
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void kempld_write8(const uint8_t addr, const uint8_t data)
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{
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outb(addr, KEMPLD_IDX);
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outb(data, KEMPLD_DAT);
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}
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uint8_t kempld_read8(const uint8_t addr)
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{
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outb(addr, KEMPLD_IDX);
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return inb(KEMPLD_DAT);
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}
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int kempld_get_mutex(int timeout_ms)
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{
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while (inb(KEMPLD_IDX) & KEMPLD_MUTEX_KEY && timeout_ms--)
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mdelay(1);
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return timeout_ms;
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}
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void kempld_release_mutex(void)
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{
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outb(KEMPLD_MUTEX_KEY, KEMPLD_IDX);
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}
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void kempld_enable_uart_for_console(void)
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{
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if (!IS_ENABLED(CONFIG_CONSOLE_SERIAL))
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return;
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if (kempld_get_mutex(100) < 0)
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return;
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switch (CONFIG_UART_FOR_CONSOLE) {
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case 0:
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kempld_write8(KEMPLD_UART_0,
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KEMPLD_UART_ENABLE |
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KEMPLD_UART_3F8 << KEMPLD_UART_IO_SHIFT);
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break;
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case 1:
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kempld_write8(KEMPLD_UART_1,
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KEMPLD_UART_ENABLE |
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KEMPLD_UART_2F8 << KEMPLD_UART_IO_SHIFT);
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break;
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default:
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break;
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}
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kempld_release_mutex();
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}
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@ -0,0 +1,115 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2017 secunet Security Networks AG
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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 <console/console.h>
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#include <device/device.h>
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#include "chip.h"
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#include "kempld.h"
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#include "kempld_internal.h"
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static void kempld_uart_read_resources(struct device *dev)
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{
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static const unsigned int io_addr[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
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const struct ec_kontron_kempld_config *const config = dev->chip_info;
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struct resource *const res_io = new_resource(dev, 0);
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struct resource *const res_irq = new_resource(dev, 1);
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const unsigned int uart = dev->path.generic.subid;
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if (!config || !res_io || !res_irq || uart >= KEMPLD_NUM_UARTS)
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return;
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const enum kempld_uart_io io = config->uart[uart].io;
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if (io >= ARRAY_SIZE(io_addr)) {
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printk(BIOS_ERR, "KEMPLD: Bad io value '%d' for UART#%u\n.",
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io, uart);
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dev->enabled = false;
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return;
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}
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const int irq = config->uart[uart].irq;
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if (irq >= 16) {
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printk(BIOS_ERR, "KEMPLD: Bad irq value '%d' for UART#%u\n.",
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irq, uart);
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dev->enabled = false;
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return;
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}
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res_io->base = io_addr[io];
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res_io->size = 8;
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res_io->flags = IORESOURCE_IO | IORESOURCE_FIXED |
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IORESOURCE_STORED | IORESOURCE_ASSIGNED;
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res_irq->base = irq;
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res_irq->size = 1;
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res_irq->flags = IORESOURCE_IO | IORESOURCE_FIXED |
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IORESOURCE_STORED | IORESOURCE_ASSIGNED;
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if (kempld_get_mutex(100) < 0)
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return;
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const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0;
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const uint8_t val = kempld_read8(reg);
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kempld_write8(reg, (val & ~(KEMPLD_UART_IO_MASK | KEMPLD_UART_IRQ_MASK))
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| io << KEMPLD_UART_IO_SHIFT
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| irq << KEMPLD_UART_IRQ_SHIFT);
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kempld_release_mutex();
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}
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static void kempld_uart_enable_resources(struct device *dev)
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{
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if (kempld_get_mutex(100) < 0)
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return;
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const unsigned int uart = dev->path.generic.subid;
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const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0;
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kempld_write8(reg, kempld_read8(reg) | KEMPLD_UART_ENABLE);
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kempld_release_mutex();
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}
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static struct device_operations kempld_uart_ops = {
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.read_resources = kempld_uart_read_resources,
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.enable_resources = kempld_uart_enable_resources,
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};
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static void kempld_enable_dev(struct device *const dev)
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{
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if (dev->path.type == DEVICE_PATH_GENERIC) {
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switch (dev->path.generic.id) {
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case 0:
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if (dev->path.generic.subid < KEMPLD_NUM_UARTS) {
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dev->ops = &kempld_uart_ops;
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break;
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}
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case 1:
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if (dev->path.generic.subid == 0) {
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kempld_i2c_device_init(dev);
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break;
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}
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default:
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printk(BIOS_WARNING,
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"KEMPLD: Spurious device %s.\n",
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dev_path(dev));
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break;
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}
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}
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}
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struct chip_operations ec_kontron_kempld_ops = {
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CHIP_NAME("Kontron KEMPLD")
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.enable_dev = kempld_enable_dev,
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};
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@ -0,0 +1,29 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2017 secunet Security Networks AG
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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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#ifndef EC_KONTRON_KEMPLD_H
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#define EC_KONTRON_KEMPLD_H
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#include <stdint.h>
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void kempld_write8(uint8_t addr, uint8_t data);
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uint8_t kempld_read8(uint8_t addr);
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int kempld_get_mutex(int timeout_ms);
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void kempld_release_mutex(void);
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void kempld_enable_uart_for_console(void);
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#endif /* EC_KONTRON_KEMPLD_H */
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@ -0,0 +1,296 @@
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/*
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* I2C bus driver for Kontron COM modules
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*
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* Copyright (C) 2017 secunet Security Networks AG
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*
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* Based on the similar driver in Linux:
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*
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* Copyright (c) 2010-2013 Kontron Europe GmbH
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* Author: Michael Brunner <michael.brunner@kontron.com>
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*
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* The driver is based on the i2c-ocores driver by Peter Korsgaard.
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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 2 as published
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* by the Free Software Foundation.
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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 <stdint.h>
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#include <console/console.h>
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#include <device/device.h>
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#include <device/i2c_bus.h>
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#include <timer.h>
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#include <delay.h>
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#include "kempld.h"
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#include "kempld_internal.h"
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#define KEMPLD_I2C_PRELOW 0x0b
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#define KEMPLD_I2C_PREHIGH 0x0c
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#define KEMPLD_I2C_DATA 0x0e
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#define KEMPLD_I2C_CTRL 0x0d
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#define I2C_CTRL_IEN 0x40
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#define I2C_CTRL_EN 0x80
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#define KEMPLD_I2C_STAT 0x0f
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#define I2C_STAT_IF 0x01
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#define I2C_STAT_TIP 0x02
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#define I2C_STAT_ARBLOST 0x20
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#define I2C_STAT_BUSY 0x40
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#define I2C_STAT_NACK 0x80
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#define KEMPLD_I2C_CMD 0x0f
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#define I2C_CMD_START 0x91
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#define I2C_CMD_STOP 0x41
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#define I2C_CMD_READ 0x21
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#define I2C_CMD_WRITE 0x11
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#define I2C_CMD_READ_ACK 0x21
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#define I2C_CMD_READ_NACK 0x29
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#define I2C_CMD_IACK 0x01
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#define KEMPLD_I2C_FREQ_MAX 2700 /* 2.7 mHz */
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#define KEMPLD_I2C_FREQ_STD 100 /* 100 kHz */
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#define EIO 5
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#define ENXIO 6
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#define EAGAIN 11
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#define EBUSY 16
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#define ETIMEDOUT 110
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enum kempld_i2c_state {
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STATE_DONE = 0,
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STATE_INIT,
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STATE_ADDR,
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STATE_ADDR10,
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STATE_START,
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STATE_WRITE,
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STATE_READ,
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STATE_ERROR,
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};
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struct kempld_i2c_data {
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const struct i2c_msg *msg;
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size_t pos;
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size_t nmsgs;
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enum kempld_i2c_state state;
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};
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/*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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static int kempld_i2c_process(struct kempld_i2c_data *const i2c)
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{
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u8 stat = kempld_read8(KEMPLD_I2C_STAT);
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const struct i2c_msg *msg = i2c->msg;
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u8 addr;
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/* Ready? */
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if (stat & I2C_STAT_TIP)
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return -EBUSY;
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if (i2c->state == STATE_DONE || i2c->state == STATE_ERROR) {
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/* Stop has been sent */
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kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_IACK);
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if (i2c->state == STATE_ERROR)
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return -EIO;
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return 0;
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}
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/* Error? */
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if (stat & I2C_STAT_ARBLOST) {
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i2c->state = STATE_ERROR;
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kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
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return -EAGAIN;
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}
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if (i2c->state == STATE_INIT) {
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if (stat & I2C_STAT_BUSY)
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return -EBUSY;
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i2c->state = STATE_ADDR;
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}
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if (i2c->state == STATE_ADDR) {
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/* 10 bit address? */
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if (i2c->msg->flags & I2C_M_TEN) {
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addr = 0xf0 | ((i2c->msg->slave >> 7) & 0x6);
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i2c->state = STATE_ADDR10;
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} else {
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addr = (i2c->msg->slave << 1);
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i2c->state = STATE_START;
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}
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/* Set read bit if necessary */
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addr |= (i2c->msg->flags & I2C_M_RD) ? 1 : 0;
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kempld_write8(KEMPLD_I2C_DATA, addr);
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kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_START);
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return 0;
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}
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/* Second part of 10 bit addressing */
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if (i2c->state == STATE_ADDR10) {
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kempld_write8(KEMPLD_I2C_DATA, i2c->msg->slave & 0xff);
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kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_WRITE);
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i2c->state = STATE_START;
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return 0;
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}
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if (i2c->state == STATE_START || i2c->state == STATE_WRITE) {
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i2c->state = (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE;
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if (stat & I2C_STAT_NACK) {
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i2c->state = STATE_ERROR;
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kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
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return -ENXIO;
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}
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} else {
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msg->buf[i2c->pos++] = kempld_read8(KEMPLD_I2C_DATA);
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}
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if (i2c->pos >= msg->len) {
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i2c->nmsgs--;
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i2c->msg++;
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i2c->pos = 0;
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msg = i2c->msg;
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if (i2c->nmsgs) {
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if (!(msg->flags & I2C_M_NOSTART)) {
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i2c->state = STATE_ADDR;
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return 0;
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} else {
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i2c->state = (msg->flags & I2C_M_RD)
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? STATE_READ : STATE_WRITE;
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}
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} else {
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i2c->state = STATE_DONE;
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kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
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return 0;
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}
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}
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if (i2c->state == STATE_READ) {
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kempld_write8(KEMPLD_I2C_CMD, i2c->pos == (msg->len - 1) ?
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I2C_CMD_READ_NACK : I2C_CMD_READ_ACK);
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} else {
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kempld_write8(KEMPLD_I2C_DATA, msg->buf[i2c->pos++]);
|
||||
kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_WRITE);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int kempld_i2c_xfer(struct device *const dev,
|
||||
const struct i2c_msg *const msgs,
|
||||
const size_t num)
|
||||
{
|
||||
struct kempld_i2c_data i2c;
|
||||
struct stopwatch sw;
|
||||
int ret;
|
||||
|
||||
if (kempld_get_mutex(100) < 0)
|
||||
return -ENXIO;
|
||||
|
||||
i2c.msg = msgs;
|
||||
i2c.pos = 0;
|
||||
i2c.nmsgs = num;
|
||||
i2c.state = STATE_INIT;
|
||||
|
||||
/* Handle the transfer */
|
||||
stopwatch_init_msecs_expire(&sw, 1000);
|
||||
while (!stopwatch_expired(&sw)) {
|
||||
ret = kempld_i2c_process(&i2c);
|
||||
|
||||
if (i2c.state == STATE_DONE || i2c.state == STATE_ERROR) {
|
||||
if (i2c.state == STATE_DONE) {
|
||||
printk(BIOS_SPEW, "kempld_i2c: Processed %zu segments.\n", num);
|
||||
ret = 0;
|
||||
} else {
|
||||
printk(BIOS_INFO, "kempld_i2c: Transfer failed.\n");
|
||||
}
|
||||
goto _release;
|
||||
}
|
||||
|
||||
if (ret == 0)
|
||||
stopwatch_init_msecs_expire(&sw, 1000);
|
||||
|
||||
udelay(10);
|
||||
}
|
||||
|
||||
i2c.state = STATE_ERROR;
|
||||
ret = -ETIMEDOUT;
|
||||
printk(BIOS_INFO, "kempld_i2c: Transfer failed.\n");
|
||||
|
||||
_release:
|
||||
kempld_release_mutex();
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct i2c_bus_operations kempld_i2c_bus_ops = {
|
||||
.transfer = kempld_i2c_xfer,
|
||||
};
|
||||
|
||||
static struct device_operations kempld_i2c_dev_ops = {
|
||||
.scan_bus = &scan_smbus,
|
||||
.ops_i2c_bus = &kempld_i2c_bus_ops,
|
||||
};
|
||||
|
||||
void kempld_i2c_device_init(struct device *const dev)
|
||||
{
|
||||
u16 prescale_corr;
|
||||
long prescale;
|
||||
u8 ctrl;
|
||||
u8 stat;
|
||||
u8 cfg;
|
||||
|
||||
if (kempld_get_mutex(100) < 0)
|
||||
return;
|
||||
|
||||
/* Make sure the device is disabled */
|
||||
ctrl = kempld_read8(KEMPLD_I2C_CTRL);
|
||||
ctrl &= ~(I2C_CTRL_EN | I2C_CTRL_IEN);
|
||||
kempld_write8(KEMPLD_I2C_CTRL, ctrl);
|
||||
|
||||
const u8 spec_major = KEMPLD_SPEC_GET_MAJOR(kempld_read8(KEMPLD_SPEC));
|
||||
if (spec_major == 1)
|
||||
prescale = KEMPLD_CLK / (KEMPLD_I2C_FREQ_STD * 5) - 1000;
|
||||
else
|
||||
prescale = KEMPLD_CLK / (KEMPLD_I2C_FREQ_STD * 4) - 3000;
|
||||
|
||||
if (prescale < 0)
|
||||
prescale = 0;
|
||||
|
||||
/* Round to the best matching value */
|
||||
prescale_corr = prescale / 1000;
|
||||
if (prescale % 1000 >= 500)
|
||||
prescale_corr++;
|
||||
|
||||
kempld_write8(KEMPLD_I2C_PRELOW, prescale_corr & 0xff);
|
||||
kempld_write8(KEMPLD_I2C_PREHIGH, prescale_corr >> 8);
|
||||
|
||||
/* Disable I2C bus output on GPIO pins */
|
||||
cfg = kempld_read8(KEMPLD_CFG);
|
||||
cfg &= ~KEMPLD_CFG_GPIO_I2C_MUX;
|
||||
kempld_write8(KEMPLD_CFG, cfg);
|
||||
|
||||
/* Enable the device */
|
||||
kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_IACK);
|
||||
ctrl |= I2C_CTRL_EN;
|
||||
kempld_write8(KEMPLD_I2C_CTRL, ctrl);
|
||||
|
||||
stat = kempld_read8(KEMPLD_I2C_STAT);
|
||||
if (stat & I2C_STAT_BUSY)
|
||||
kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
|
||||
|
||||
dev->ops = &kempld_i2c_dev_ops;
|
||||
|
||||
kempld_release_mutex();
|
||||
}
|
||||
|
|
@ -0,0 +1,46 @@
|
|||
/*
|
||||
* This file is part of the coreboot project.
|
||||
*
|
||||
* Copyright (C) 2017 secunet Security Networks AG
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef EC_KONTRON_KEMPLD_INTERNAL_H
|
||||
#define EC_KONTRON_KEMPLD_INTERNAL_H
|
||||
|
||||
#include <device/device.h>
|
||||
|
||||
/* i/o ports */
|
||||
#define KEMPLD_IDX 0xa80
|
||||
#define KEMPLD_MUTEX_KEY 0x80
|
||||
#define KEMPLD_DAT 0xa81
|
||||
|
||||
/* indexed registers */
|
||||
#define KEMPLD_SPEC 0x06
|
||||
#define KEMPLD_SPEC_GET_MINOR(x) (x & 0x0f)
|
||||
#define KEMPLD_SPEC_GET_MAJOR(x) (x >> 4 & 0x0f)
|
||||
|
||||
#define KEMPLD_CFG 0x37
|
||||
#define KEMPLD_CFG_GPIO_I2C_MUX (1 << 0)
|
||||
|
||||
#define KEMPLD_UART_0 0x30
|
||||
#define KEMPLD_UART_1 0x31
|
||||
#define KEMPLD_UART_IRQ_SHIFT 0
|
||||
#define KEMPLD_UART_IRQ_MASK (0xf << KEMPLD_UART_IRQ_SHIFT)
|
||||
#define KEMPLD_UART_IO_SHIFT 4
|
||||
#define KEMPLD_UART_IO_MASK (0x3 << KEMPLD_UART_IO_SHIFT)
|
||||
#define KEMPLD_UART_ENABLE 0x80
|
||||
|
||||
#define KEMPLD_CLK 33333333 /* 33MHz */
|
||||
|
||||
void kempld_i2c_device_init(struct device *const dev);
|
||||
|
||||
#endif /* EC_KONTRON_KEMPLD_INTERNAL_H */
|
||||
Loading…
Reference in New Issue