diff options
author | Nico Huber <nico.huber@secunet.com> | 2017-09-19 14:13:34 +0200 |
---|---|---|
committer | Patrick Georgi <pgeorgi@google.com> | 2019-01-24 13:56:25 +0000 |
commit | 016ef9e9bc36c60101b707a8c1c926e78350befa (patch) | |
tree | 8c9254f2d4888d7bf14e18f2562f2fde564f724e /src/ec/kontron/kempld/kempld.c | |
parent | b2e610011cfa8c821d93b474274fdab383462c49 (diff) |
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>
Diffstat (limited to 'src/ec/kontron/kempld/kempld.c')
-rw-r--r-- | src/ec/kontron/kempld/kempld.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/ec/kontron/kempld/kempld.c b/src/ec/kontron/kempld/kempld.c new file mode 100644 index 0000000000..19c18804c2 --- /dev/null +++ b/src/ec/kontron/kempld/kempld.c @@ -0,0 +1,115 @@ +/* + * 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. + */ + +#include <console/console.h> +#include <device/device.h> + +#include "chip.h" +#include "kempld.h" +#include "kempld_internal.h" + +static void kempld_uart_read_resources(struct device *dev) +{ + static const unsigned int io_addr[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; + + const struct ec_kontron_kempld_config *const config = dev->chip_info; + + struct resource *const res_io = new_resource(dev, 0); + struct resource *const res_irq = new_resource(dev, 1); + const unsigned int uart = dev->path.generic.subid; + if (!config || !res_io || !res_irq || uart >= KEMPLD_NUM_UARTS) + return; + + const enum kempld_uart_io io = config->uart[uart].io; + if (io >= ARRAY_SIZE(io_addr)) { + printk(BIOS_ERR, "KEMPLD: Bad io value '%d' for UART#%u\n.", + io, uart); + dev->enabled = false; + return; + } + + const int irq = config->uart[uart].irq; + if (irq >= 16) { + printk(BIOS_ERR, "KEMPLD: Bad irq value '%d' for UART#%u\n.", + irq, uart); + dev->enabled = false; + return; + } + + res_io->base = io_addr[io]; + res_io->size = 8; + res_io->flags = IORESOURCE_IO | IORESOURCE_FIXED | + IORESOURCE_STORED | IORESOURCE_ASSIGNED; + res_irq->base = irq; + res_irq->size = 1; + res_irq->flags = IORESOURCE_IO | IORESOURCE_FIXED | + IORESOURCE_STORED | IORESOURCE_ASSIGNED; + + if (kempld_get_mutex(100) < 0) + return; + + const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0; + const uint8_t val = kempld_read8(reg); + kempld_write8(reg, (val & ~(KEMPLD_UART_IO_MASK | KEMPLD_UART_IRQ_MASK)) + | io << KEMPLD_UART_IO_SHIFT + | irq << KEMPLD_UART_IRQ_SHIFT); + + kempld_release_mutex(); +} + +static void kempld_uart_enable_resources(struct device *dev) +{ + if (kempld_get_mutex(100) < 0) + return; + + const unsigned int uart = dev->path.generic.subid; + const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0; + kempld_write8(reg, kempld_read8(reg) | KEMPLD_UART_ENABLE); + + kempld_release_mutex(); +} + +static struct device_operations kempld_uart_ops = { + .read_resources = kempld_uart_read_resources, + .enable_resources = kempld_uart_enable_resources, +}; + +static void kempld_enable_dev(struct device *const dev) +{ + if (dev->path.type == DEVICE_PATH_GENERIC) { + switch (dev->path.generic.id) { + case 0: + if (dev->path.generic.subid < KEMPLD_NUM_UARTS) { + dev->ops = &kempld_uart_ops; + break; + } + case 1: + if (dev->path.generic.subid == 0) { + kempld_i2c_device_init(dev); + break; + } + default: + printk(BIOS_WARNING, + "KEMPLD: Spurious device %s.\n", + dev_path(dev)); + break; + } + } +} + +struct chip_operations ec_kontron_kempld_ops = { + CHIP_NAME("Kontron KEMPLD") + .enable_dev = kempld_enable_dev, +}; |