88 строки
2.0 KiB
C
88 строки
2.0 KiB
C
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/*
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* Copyright 2013 Tilera Corporation. All Rights Reserved.
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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
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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/*
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* Implementation of UART gxio calls.
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*/
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#include <linux/io.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <gxio/uart.h>
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#include <gxio/iorpc_globals.h>
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#include <gxio/iorpc_uart.h>
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#include <gxio/kiorpc.h>
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int gxio_uart_init(gxio_uart_context_t *context, int uart_index)
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{
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char file[32];
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int fd;
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snprintf(file, sizeof(file), "uart/%d/iorpc", uart_index);
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fd = hv_dev_open((HV_VirtAddr) file, 0);
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if (fd < 0) {
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if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
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return fd;
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else
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return -ENODEV;
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}
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context->fd = fd;
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/* Map in the MMIO space. */
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context->mmio_base = (void __force *)
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iorpc_ioremap(fd, HV_UART_MMIO_OFFSET, HV_UART_MMIO_SIZE);
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if (context->mmio_base == NULL) {
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hv_dev_close(context->fd);
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context->fd = -1;
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return -ENODEV;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(gxio_uart_init);
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int gxio_uart_destroy(gxio_uart_context_t *context)
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{
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iounmap((void __force __iomem *)(context->mmio_base));
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hv_dev_close(context->fd);
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context->mmio_base = NULL;
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context->fd = -1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(gxio_uart_destroy);
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/* UART register write wrapper. */
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void gxio_uart_write(gxio_uart_context_t *context, uint64_t offset,
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uint64_t word)
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{
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__gxio_mmio_write(context->mmio_base + offset, word);
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}
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EXPORT_SYMBOL_GPL(gxio_uart_write);
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/* UART register read wrapper. */
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uint64_t gxio_uart_read(gxio_uart_context_t *context, uint64_t offset)
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{
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return __gxio_mmio_read(context->mmio_base + offset);
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}
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EXPORT_SYMBOL_GPL(gxio_uart_read);
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