106 lines
3.4 KiB
C
106 lines
3.4 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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#ifndef _GXIO_UART_H_
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#define _GXIO_UART_H_
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#include "common.h"
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#include <hv/drv_uart_intf.h>
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#include <hv/iorpc.h>
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/*
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*
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* An API for manipulating UART interface.
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*/
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/*
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*
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* The Rshim allows access to the processor's UART interface.
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*/
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/* A context object used to manage UART resources. */
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typedef struct {
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/* File descriptor for calling up to the hypervisor. */
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int fd;
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/* The VA at which our MMIO registers are mapped. */
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char *mmio_base;
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} gxio_uart_context_t;
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/* Request UART interrupts.
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*
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* Request that interrupts be delivered to a tile when the UART's
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* Receive FIFO is written, or the Write FIFO is read.
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*
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* @param context Pointer to a properly initialized gxio_uart_context_t.
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* @param bind_cpu_x X coordinate of CPU to which interrupt will be delivered.
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* @param bind_cpu_y Y coordinate of CPU to which interrupt will be delivered.
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* @param bind_interrupt IPI interrupt number.
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* @param bind_event Sub-interrupt event bit number; a negative value can
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* disable the interrupt.
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* @return Zero if all of the requested UART events were successfully
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* configured to interrupt.
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*/
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extern int gxio_uart_cfg_interrupt(gxio_uart_context_t *context,
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int bind_cpu_x,
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int bind_cpu_y,
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int bind_interrupt, int bind_event);
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/* Initialize a UART context.
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*
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* A properly initialized context must be obtained before any of the other
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* gxio_uart routines may be used.
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*
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* @param context Pointer to a gxio_uart_context_t, which will be initialized
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* by this routine, if it succeeds.
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* @param uart_index Index of the UART to use.
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* @return Zero if the context was successfully initialized, else a
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* GXIO_ERR_xxx error code.
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*/
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extern int gxio_uart_init(gxio_uart_context_t *context, int uart_index);
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/* Destroy a UART context.
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*
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* Once destroyed, a context may not be used with any gxio_uart routines
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* other than gxio_uart_init(). After this routine returns, no further
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* interrupts requested on this context will be delivered. The state and
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* configuration of the pins which had been attached to this context are
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* unchanged by this operation.
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*
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* @param context Pointer to a gxio_uart_context_t.
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* @return Zero if the context was successfully destroyed, else a
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* GXIO_ERR_xxx error code.
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*/
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extern int gxio_uart_destroy(gxio_uart_context_t *context);
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/* Write UART register.
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* @param context Pointer to a gxio_uart_context_t.
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* @param offset UART register offset.
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* @param word Data will be wrote to UART reigister.
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*/
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extern void gxio_uart_write(gxio_uart_context_t *context, uint64_t offset,
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uint64_t word);
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/* Read UART register.
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* @param context Pointer to a gxio_uart_context_t.
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* @param offset UART register offset.
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* @return Data read from UART register.
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*/
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extern uint64_t gxio_uart_read(gxio_uart_context_t *context, uint64_t offset);
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#endif /* _GXIO_UART_H_ */
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