diff options
Diffstat (limited to 'src/ec/kontron/kempld')
| -rw-r--r-- | src/ec/kontron/kempld/Kconfig | 5 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/Makefile.inc | 4 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/chip.h | 38 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/early_kempld.c | 72 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/kempld.c | 115 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/kempld.h | 29 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/kempld_i2c.c | 296 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/kempld_internal.h | 46 |
8 files changed, 605 insertions, 0 deletions
diff --git a/src/ec/kontron/kempld/Kconfig b/src/ec/kontron/kempld/Kconfig new file mode 100644 index 0000000000..647bd12d69 --- /dev/null +++ b/src/ec/kontron/kempld/Kconfig @@ -0,0 +1,5 @@ +config EC_KONTRON_KEMPLD + bool + help + Driver for Kontron's express module programmable logic device used + on their COMexpress modules. diff --git a/src/ec/kontron/kempld/Makefile.inc b/src/ec/kontron/kempld/Makefile.inc new file mode 100644 index 0000000000..0d5988625e --- /dev/null +++ b/src/ec/kontron/kempld/Makefile.inc @@ -0,0 +1,4 @@ +bootblock-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c +ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c +ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld.c +ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld_i2c.c diff --git a/src/ec/kontron/kempld/chip.h b/src/ec/kontron/kempld/chip.h new file mode 100644 index 0000000000..7f0693782a --- /dev/null +++ b/src/ec/kontron/kempld/chip.h @@ -0,0 +1,38 @@ +/* + * 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_CHIP_H +#define EC_KONTRON_KEMPLD_CHIP_H + +#define KEMPLD_NUM_UARTS 2 + +enum kempld_uart_io { + KEMPLD_UART_3F8 = 0, + KEMPLD_UART_2F8 = 1, + KEMPLD_UART_3E8 = 2, + KEMPLD_UART_2E8 = 3, +}; + +struct kempld_uart { + enum kempld_uart_io io; + unsigned int irq; +}; + +struct ec_kontron_kempld_config { + struct kempld_uart uart[KEMPLD_NUM_UARTS]; +}; + +#endif /* EC_KONTRON_KEMPLD_CHIP_H */ diff --git a/src/ec/kontron/kempld/early_kempld.c b/src/ec/kontron/kempld/early_kempld.c new file mode 100644 index 0000000000..773b8b6ef9 --- /dev/null +++ b/src/ec/kontron/kempld/early_kempld.c @@ -0,0 +1,72 @@ +/* + * 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 <stdint.h> +#include <arch/io.h> +#include <delay.h> + +#include "chip.h" +#include "kempld.h" +#include "kempld_internal.h" + +void kempld_write8(const uint8_t addr, const uint8_t data) +{ + outb(addr, KEMPLD_IDX); + outb(data, KEMPLD_DAT); +} + +uint8_t kempld_read8(const uint8_t addr) +{ + outb(addr, KEMPLD_IDX); + return inb(KEMPLD_DAT); +} + +int kempld_get_mutex(int timeout_ms) +{ + while (inb(KEMPLD_IDX) & KEMPLD_MUTEX_KEY && timeout_ms--) + mdelay(1); + return timeout_ms; +} + +void kempld_release_mutex(void) +{ + outb(KEMPLD_MUTEX_KEY, KEMPLD_IDX); +} + +void kempld_enable_uart_for_console(void) +{ + if (!IS_ENABLED(CONFIG_CONSOLE_SERIAL)) + return; + + if (kempld_get_mutex(100) < 0) + return; + + switch (CONFIG_UART_FOR_CONSOLE) { + case 0: + kempld_write8(KEMPLD_UART_0, + KEMPLD_UART_ENABLE | + KEMPLD_UART_3F8 << KEMPLD_UART_IO_SHIFT); + break; + case 1: + kempld_write8(KEMPLD_UART_1, + KEMPLD_UART_ENABLE | + KEMPLD_UART_2F8 << KEMPLD_UART_IO_SHIFT); + break; + default: + break; + } + + kempld_release_mutex(); +} 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, +}; diff --git a/src/ec/kontron/kempld/kempld.h b/src/ec/kontron/kempld/kempld.h new file mode 100644 index 0000000000..fe5f54f02a --- /dev/null +++ b/src/ec/kontron/kempld/kempld.h @@ -0,0 +1,29 @@ +/* + * 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_H +#define EC_KONTRON_KEMPLD_H + +#include <stdint.h> + +void kempld_write8(uint8_t addr, uint8_t data); +uint8_t kempld_read8(uint8_t addr); + +int kempld_get_mutex(int timeout_ms); +void kempld_release_mutex(void); + +void kempld_enable_uart_for_console(void); + +#endif /* EC_KONTRON_KEMPLD_H */ diff --git a/src/ec/kontron/kempld/kempld_i2c.c b/src/ec/kontron/kempld/kempld_i2c.c new file mode 100644 index 0000000000..fdc0b50dfc --- /dev/null +++ b/src/ec/kontron/kempld/kempld_i2c.c @@ -0,0 +1,296 @@ +/* + * I2C bus driver for Kontron COM modules + * + * Copyright (C) 2017 secunet Security Networks AG + * + * Based on the similar driver in Linux: + * + * Copyright (c) 2010-2013 Kontron Europe GmbH + * Author: Michael Brunner <michael.brunner@kontron.com> + * + * The driver is based on the i2c-ocores driver by Peter Korsgaard. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License 2 as published + * by the Free Software Foundation. + * + * 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 <stdint.h> +#include <console/console.h> +#include <device/device.h> +#include <device/i2c_bus.h> +#include <timer.h> +#include <delay.h> + +#include "kempld.h" +#include "kempld_internal.h" + +#define KEMPLD_I2C_PRELOW 0x0b +#define KEMPLD_I2C_PREHIGH 0x0c +#define KEMPLD_I2C_DATA 0x0e + +#define KEMPLD_I2C_CTRL 0x0d +#define I2C_CTRL_IEN 0x40 +#define I2C_CTRL_EN 0x80 + +#define KEMPLD_I2C_STAT 0x0f +#define I2C_STAT_IF 0x01 +#define I2C_STAT_TIP 0x02 +#define I2C_STAT_ARBLOST 0x20 +#define I2C_STAT_BUSY 0x40 +#define I2C_STAT_NACK 0x80 + +#define KEMPLD_I2C_CMD 0x0f +#define I2C_CMD_START 0x91 +#define I2C_CMD_STOP 0x41 +#define I2C_CMD_READ 0x21 +#define I2C_CMD_WRITE 0x11 +#define I2C_CMD_READ_ACK 0x21 +#define I2C_CMD_READ_NACK 0x29 +#define I2C_CMD_IACK 0x01 + +#define KEMPLD_I2C_FREQ_MAX 2700 /* 2.7 mHz */ +#define KEMPLD_I2C_FREQ_STD 100 /* 100 kHz */ + +#define EIO 5 +#define ENXIO 6 +#define EAGAIN 11 +#define EBUSY 16 +#define ETIMEDOUT 110 + +enum kempld_i2c_state { + STATE_DONE = 0, + STATE_INIT, + STATE_ADDR, + STATE_ADDR10, + STATE_START, + STATE_WRITE, + STATE_READ, + STATE_ERROR, +}; + +struct kempld_i2c_data { + const struct i2c_msg *msg; + size_t pos; + size_t nmsgs; + enum kempld_i2c_state state; +}; + +/* + * kempld_get_mutex must be called prior to calling this function. + */ +static int kempld_i2c_process(struct kempld_i2c_data *const i2c) +{ + u8 stat = kempld_read8(KEMPLD_I2C_STAT); + const struct i2c_msg *msg = i2c->msg; + u8 addr; + + /* Ready? */ + if (stat & I2C_STAT_TIP) + return -EBUSY; + + if (i2c->state == STATE_DONE || i2c->state == STATE_ERROR) { + /* Stop has been sent */ + kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_IACK); + if (i2c->state == STATE_ERROR) + return -EIO; + return 0; + } + + /* Error? */ + if (stat & I2C_STAT_ARBLOST) { + i2c->state = STATE_ERROR; + kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP); + return -EAGAIN; + } + + if (i2c->state == STATE_INIT) { + if (stat & I2C_STAT_BUSY) + return -EBUSY; + + i2c->state = STATE_ADDR; + } + + if (i2c->state == STATE_ADDR) { + /* 10 bit address? */ + if (i2c->msg->flags & I2C_M_TEN) { + addr = 0xf0 | ((i2c->msg->slave >> 7) & 0x6); + i2c->state = STATE_ADDR10; + } else { + addr = (i2c->msg->slave << 1); + i2c->state = STATE_START; + } + + /* Set read bit if necessary */ + addr |= (i2c->msg->flags & I2C_M_RD) ? 1 : 0; + + kempld_write8(KEMPLD_I2C_DATA, addr); + kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_START); + + return 0; + } + + /* Second part of 10 bit addressing */ + if (i2c->state == STATE_ADDR10) { + kempld_write8(KEMPLD_I2C_DATA, i2c->msg->slave & 0xff); + kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_WRITE); + + i2c->state = STATE_START; + return 0; + } + + if (i2c->state == STATE_START || i2c->state == STATE_WRITE) { + i2c->state = (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE; + + if (stat & I2C_STAT_NACK) { + i2c->state = STATE_ERROR; + kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP); + return -ENXIO; + } + } else { + msg->buf[i2c->pos++] = kempld_read8(KEMPLD_I2C_DATA); + } + + if (i2c->pos >= msg->len) { + i2c->nmsgs--; + i2c->msg++; + i2c->pos = 0; + msg = i2c->msg; + + if (i2c->nmsgs) { + if (!(msg->flags & I2C_M_NOSTART)) { + i2c->state = STATE_ADDR; + return 0; + } else { + i2c->state = (msg->flags & I2C_M_RD) + ? STATE_READ : STATE_WRITE; + } + } else { + i2c->state = STATE_DONE; + kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP); + return 0; + } + } + + if (i2c->state == STATE_READ) { + kempld_write8(KEMPLD_I2C_CMD, i2c->pos == (msg->len - 1) ? + I2C_CMD_READ_NACK : I2C_CMD_READ_ACK); + } else { + 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(); +} diff --git a/src/ec/kontron/kempld/kempld_internal.h b/src/ec/kontron/kempld/kempld_internal.h new file mode 100644 index 0000000000..93351ce772 --- /dev/null +++ b/src/ec/kontron/kempld/kempld_internal.h @@ -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 */ |