31ad67abd7
This patch extends the Intel Quark X1000 SoC UART initialization API to accept a numeric baud rate specification.
92 lines
3.4 KiB
C
92 lines
3.4 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 Initialize a UART.
|
|
* \param dev Device to initialize.
|
|
*/
|
|
void
|
|
quarkX1000_uart_init(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(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);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|