contiki/cpu/x86/drivers/quarkX1000/uart.c
Michael LeMay bde8eb35ae x86, galileo: Fix UART system call authorization initialization
This patch fixes UART system call authorization initialization (when
protection domain support is enabled) to only initialize the system call
entrypoint and authorization data structures once, prior to per-port
setup. Previously, if two UARTs were configured, the setup procedure for
the second UART would erase the system call authorization for the
first (console) UART, resulting in a crash upon the next attempt to
perform console output.
2016-08-04 16:09:44 -07:00

102 lines
3.6 KiB
C

/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "uart.h"
#include "uart-16x50.h"
#include <assert.h>
PROT_DOMAINS_ALLOC(uart_16x50_driver_t, quarkX1000_uart0);
PROT_DOMAINS_ALLOC(uart_16x50_driver_t, quarkX1000_uart1);
/* UART base frequency from section 18.2.2 of Intel Quark SoC X1000
* Datasheet.
*/
#define QUARK_X1000_UART_FBASE 44236800
/*---------------------------------------------------------------------------*/
/**
* \brief Perform common initialization that must precede per-port
* initialization.
*/
void
quarkX1000_uart_init(void)
{
uart_16x50_init();
}
/*---------------------------------------------------------------------------*/
/**
* \brief Initialize a UART.
* \param dev Device to initialize.
*/
void
quarkX1000_uart_init_port(quarkX1000_uart_dev_t dev, unsigned baud)
{
uint16_t dl;
pci_config_addr_t pci_addr;
uart_16x50_driver_t ATTR_KERN_ADDR_SPACE *drv;
assert((dev == QUARK_X1000_UART_0) || (dev == QUARK_X1000_UART_1));
pci_addr.raw = 0;
/* PCI addresses from section 18.4 of Intel Quark SoC X1000 Datasheet. */
pci_addr.dev = 20;
pci_addr.func = (dev == QUARK_X1000_UART_0) ? 1 : 5;
pci_addr.reg_off = PCI_CONFIG_REG_BAR0;
if(dev == QUARK_X1000_UART_0) {
drv = &quarkX1000_uart0;
PROT_DOMAINS_INIT_ID(quarkX1000_uart0);
} else {
drv = &quarkX1000_uart1;
PROT_DOMAINS_INIT_ID(quarkX1000_uart1);
}
/* Divisor setting from section 18.2.2 of Intel Quark SoC X1000 Datasheet. */
dl = QUARK_X1000_UART_FBASE / (16 * baud);
uart_16x50_init_port(drv, pci_addr, dl);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Transmit a character via a UART.
* \param dev Device to use.
* \param c Character to transmit.
*/
void
quarkX1000_uart_tx(quarkX1000_uart_dev_t dev, uint8_t c)
{
uart_16x50_driver_t drv;
assert((dev == QUARK_X1000_UART_0) || (dev == QUARK_X1000_UART_1));
prot_domains_copy_dcd(&drv,
(dev == QUARK_X1000_UART_0) ?
&quarkX1000_uart0 : &quarkX1000_uart1);
uart_16x50_tx(drv, c);
}
/*---------------------------------------------------------------------------*/