103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/* linux/include/asm-arm/arch-bast/dma.h
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*
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* Copyright (C) 2003,2004 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Samsung S3C PWM support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Changelog:
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* ??-May-2003 BJD Created file
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* ??-Jun-2003 BJD Added more dma functionality to go with arch
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* 10-Nov-2004 BJD Added sys_device support
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*/
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#ifndef __ASM_ARCH_DMA_H
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#define __ASM_ARCH_DMA_H __FILE__
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#include <linux/sysdev.h>
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#include <asm/arch/regs-timer.h>
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#define pwmch_t int
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/* we have 4 pwm channels */
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#define S3C_PWM_CHANNELS 4
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struct s3c_pwm_client {
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char *name;
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};
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typedef struct s3c_pwm_client s3c_pwm_client_t;
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typedef struct s3c_pwm_chan_s s3c2450_pwm_chan_t;
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/* s3c_pwm_cbfn_t
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*
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* buffer callback routine type
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*/
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typedef void (*s3c_pwm_cbfn_t)(void *buf);
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/* struct s3c_pwm_chan_s
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*
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* full state information for each DMA channel
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*/
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struct s3c_pwm_chan_s {
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/* channel state flags and information */
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unsigned char number; /* number of this dma channel */
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unsigned char in_use; /* channel allocated */
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unsigned char irq_claimed; /* irq claimed for channel */
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unsigned char irq_enabled; /* irq enabled for channel */
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/* channel state */
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s3c_pwm_client_t *client;
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void *dev;
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/* channel configuration */
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unsigned int flags; /* channel flags */
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/* channel's hardware position and configuration */
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unsigned int irq; /* channel irq */
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/* driver handles */
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s3c_pwm_cbfn_t callback_fn; /* buffer done callback */
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/* system device */
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struct sys_device sysdev;
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};
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/* the currently allocated channel information */
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extern s3c2450_pwm_chan_t s3c_chans[];
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/* functions --------------------------------------------------------------- */
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/* s3c2450_pwm_request
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*
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* request a pwm channel exclusivley
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*/
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extern int s3c2450_pwm_request(pwmch_t channel, s3c_pwm_client_t *, void *dev);
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/* s3c2450_pwm_free
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*
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* free the dma channel (will also abort any outstanding operations)
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*/
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extern int s3c2450_pwm_free(pwmch_t channel, s3c_pwm_client_t *);
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extern int s3c2450_pwm_set_buffdone_fn(pwmch_t, s3c_pwm_cbfn_t rtn);
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extern int s3c2450_timer_setup (int channel, int usec, unsigned long g_tcnt, unsigned long g_tcmp);
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#endif /* __ASM_ARCH_DMA_H */
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