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87 lines
2.0 KiB
87 lines
2.0 KiB
/* |
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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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