parport.c

上传linux-jx2410的源代码

/* $Id: parport.c,v 1.1.1.1 2004/02/04 12:55:28 laputa Exp $
 * 
 * Elinux parallel port driver
 * NOTE!
 *   Since par0 shares DMA with ser2 and par 1 shares DMA with ser3
 *   this should be handled if both are enabled at the same time.
 *   THIS IS NOT HANDLED YET!
 *
 * Copyright (c) 2001 Axis Communications AB
 * 
 * Author: Fredrik Hugosson
 *
 */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/parport.h>
#include <linux/ioport.h>
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>

#include <linux/slab.h>
#include <linux/interrupt.h>

#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/io.h>

#include <asm/segment.h>
#include <asm/system.h>

#include <asm/svinto.h>


#undef DEBUG
#ifdef DEBUG
#define DPRINTK printk
#else
static inline int DPRINTK(void *nothing, ...) {return 0;}
#endif

/*
 * Etrax100 DMAchannels:
 * Par0 out : DMA2
 * Par0 in  : DMA3
 * Par1 out : DMA4
 * Par1 in  : DMA5
 * NOTE! par0 is shared with ser2 and par1 is shared with ser3 regarding
 *       DMA and DMA irq
 */

//#define CONFIG_PAR0_INT 1
//#define CONFIG_PAR1_INT 1

#define SETF(var, reg, field, val) \
	var = (var & ~IO_MASK(##reg##, field)) | IO_FIELD(##reg##, field, val)

#define SETS(var, reg, field, val) \
	var = (var & ~IO_MASK(##reg##, field)) | IO_STATE(##reg##, field, val)

struct etrax100par_struct {
	/* parallell port control */
	volatile u32 *reg_ctrl_data; /* R_PARx_CTRL_DATA */
	const volatile u32 *reg_status_data; /* R_PARx_STATUS_DATA */
	volatile u32 *reg_config; /* R_PARx_CONFIG */
	volatile u32 *reg_delay; /* R_PARx_DELAY */
	
	/* DMA control */
	int odma;
	unsigned long dma_irq;  /* bitnr in R_IRQ_MASK2 for dmaX_descr */

	volatile char *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR, output */
	volatile u32 *ofirstadr;   /* adr to R_DMA_CHx_FIRST, output */
	volatile char *ocmdadr;     /* adr to R_DMA_CHx_CMD, output */
	
	volatile char *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR, input */
	volatile u32 *ifirstadr;   /* adr to R_DMA_CHx_FIRST, input */
	volatile char *icmdadr;     /* adr to R_DMA_CHx_CMD, input */

	/* Non DMA interrupt stuff */
	unsigned long int_irq; /* R_VECT_MASK_RD */
	const volatile u32 *irq_mask_rd; /* R_IRQ_MASKX_RD */
	volatile u32 *irq_mask_clr; /* R_IRQ_MASKX_RD */
	const volatile u32 *irq_read; /* R_IRQ_READX */
	volatile u32 *irq_mask_set; /* R_IRQ_MASKX_SET */
	unsigned long irq_mask_tx;  /* bitmask in R_IRQ_ for tx (ready) int */
	unsigned long irq_mask_rx;  /* bitmask in R_IRQ_ for rx (data) int */
	unsigned long irq_mask_ecp_cmd;  /* mask in R_IRQ_ for ecp_cmd int */
	unsigned long irq_mask_peri;  /* bitmask in R_IRQ_ for peri int */
	int portnr;
  
	/* ----- end of fields initialised in port_table[] below ----- */

	struct parport *port;
  
	/* Shadow registers */
	volatile unsigned long reg_ctrl_data_shadow; /* for R_PARx_CTRL_DATA */
	volatile unsigned long reg_config_shadow;    /* for R_PARx_CONFIG */
	volatile unsigned long reg_delay_shadow;    /* for R_PARx_DELAY */
};

/* Always have the complete structs here, even if the port is not used!
 *  (that way we can index this by the port number)
 */
static struct etrax100par_struct port_table[] = {
	{ 
		R_PAR0_CTRL_DATA,
		R_PAR0_STATUS_DATA,
		R_PAR0_CONFIG,
		R_PAR0_DELAY,
		/* DMA interrupt stuff */
		2,
		1U << 4, /* uses DMA 2 and 3 */
		R_DMA_CH2_CLR_INTR,
		R_DMA_CH2_FIRST,
		R_DMA_CH2_CMD,
		R_DMA_CH3_CLR_INTR,
		R_DMA_CH3_FIRST,
		R_DMA_CH3_CMD,
		/* Non DMA interrupt stuff */
		IO_BITNR(R_VECT_MASK_RD, par0),
		R_IRQ_MASK0_RD,
		R_IRQ_MASK0_CLR,
		R_IRQ_READ0,
		R_IRQ_MASK0_SET,
		IO_FIELD(R_IRQ_MASK0_RD, par0_ready, 1U), /* tx (ready)*/
		IO_FIELD(R_IRQ_MASK0_RD, par0_data, 1U), /* rx (data)*/
		IO_FIELD(R_IRQ_MASK0_RD, par0_ecp_cmd, 1U), /* ecp_cmd */
		IO_FIELD(R_IRQ_MASK0_RD, par0_peri, 1U), /* peri */
		0
	},
	{
		R_PAR1_CTRL_DATA,
		R_PAR1_STATUS_DATA,
		R_PAR1_CONFIG,
		R_PAR1_DELAY,
		/* DMA interrupt stuff */
		4,
		1U << 8, /* uses DMA 4 and 5 */
		
		R_DMA_CH4_CLR_INTR,
		R_DMA_CH4_FIRST,
		R_DMA_CH4_CMD,
		R_DMA_CH5_CLR_INTR,
		R_DMA_CH5_FIRST,
		R_DMA_CH5_CMD,
		/* Non DMA interrupt stuff */
		IO_BITNR(R_VECT_MASK_RD, par1),
		R_IRQ_MASK1_RD,
		R_IRQ_MASK1_CLR,
		R_IRQ_READ1,
		R_IRQ_MASK1_SET,
		IO_FIELD(R_IRQ_MASK1_RD, par1_ready, 1U), /* tx (ready)*/
		IO_FIELD(R_IRQ_MASK1_RD, par1_data, 1U), /* rx (data)*/
		IO_FIELD(R_IRQ_MASK1_RD, par1_ecp_cmd, 1U), /* ecp_cmd */
		IO_FIELD(R_IRQ_MASK1_RD, par1_peri, 1U), /* peri */
		1
	}
};


#define NR_PORTS (sizeof(port_table)/sizeof(struct etrax100par_struct))

static void
parport_etrax_write_data(struct parport *p, unsigned char value)
{
	struct etrax100par_struct *info =
		(struct etrax100par_struct *)p->private_data;

	DPRINTK("* E100 PP %d: etrax_write_data %02X\n", p->portnum, value);
	SETF(info->reg_ctrl_data_shadow, R_PAR0_CTRL_DATA, data, value);
	*info->reg_ctrl_data = info->reg_ctrl_data_shadow;
}


static unsigned char
parport_etrax_read_data(struct parport *p)
{
	unsigned char ret;
	struct etrax100par_struct *info =
		(struct etrax100par_struct *)p->private_data;

	ret = IO_EXTRACT(R_PAR0_STATUS_DATA, data, *info->reg_status_data);

	DPRINTK("* E100 PP %d: etrax_read_data %02X\n", p->portnum, ret);
	return ret;
}


static void
parport_etrax_write_control(struct parport *p, unsigned char control)
{
	struct etrax100par_struct *info =
		(struct etrax100par_struct *)p->private_data;

	DPRINTK("* E100 PP %d: etrax_write_control %02x\n", p->portnum, control);
  
	SETF(info->reg_ctrl_data_shadow, R_PAR0_CTRL_DATA, strb,
	     (control & PARPORT_CONTROL_STROBE) > 0);
	SETF(info->reg_ctrl_data_shadow, R_PAR0_CTRL_DATA, autofd,
	     (control & PARPORT_CONTROL_AUTOFD) > 0);
	SETF(info->reg_ctrl_data_shadow, R_PAR0_CTRL_DATA, init,
	     (control & PARPORT_CONTROL_INIT) > 0);
	SETF(info->reg_ctrl_data_shadow, R_PAR0_CTRL_DATA, seli,
	     (control & PARPORT_CONTROL_SELECT) > 0);

	*info->reg_ctrl_data = info->reg_ctrl_data_shadow;
}


static unsigned char
parport_etrax_read_control( struct parport *p)
{
	unsigned char ret = 0;
	struct etrax100par_struct *info =
		(struct etrax100par_struct *)p->private_data;

	if (IO_EXTRACT(R_PAR0_CTRL_DATA, strb, info->reg_ctrl_data_shadow))
		ret |= PARPORT_CONTROL_STROBE;
	if (IO_EXTRACT(R_PAR0_CTRL_DATA, autofd, info->reg_ctrl_data_shadow))
		ret |= PARPORT_CONTROL_AUTOFD;
	if (IO_EXTRACT(R_PAR0_CTRL_DATA, init, info->reg_ctrl_data_shadow))
		ret |= PARPORT_CONTROL_INIT;
	if (IO_EXTRACT(R_PAR0_CTRL_DATA, seli, info->reg_ctrl_data_shadow))
		ret |= PARPORT_CONTROL_SELECT;

	DPRINTK("* E100 PP %d: etrax_read_control %02x\n", p->portnum, ret);
	return ret;
}


static unsigned char
parport_etrax_frob_control(struct parport *p, unsigned char mask,
                           unsigned char val)
{
	unsigned char old;

	DPRINTK("* E100 PP %d: frob_control mask %02x, value %02x\n",
		p->portnum, mask, val);
	old = parport_etrax_read_control(p);
	parport_etrax_write_control(p, (old & ~mask) ^ val);
	return old;
}


static unsigned char
parport_etrax_read_status(struct parport *p)
{
	unsigned char ret = 0;
	struct etrax100par_struct *info =
		(struct etrax100par_struct *)p->private_data;

	if (IO_EXTRACT(R_PAR0_STATUS_DATA, fault, *info->reg_status_data))
		ret |= PARPORT_STATUS_ERROR;
	if (IO_EXTRACT(R_PAR0_STATUS_DATA, sel, *info->reg_status_data))
		ret |= PARPORT_STATUS_SELECT;
	if (!IO_EXTRACT(R_PAR0_STATUS_DATA, perr, *info->reg_status_data))
		ret |= PARPORT_STATUS_PAPEROUT;
	if (IO_EXTRACT(R_PAR0_STATUS_DATA, ack, *info->reg_status_data))
		ret |= PARPORT_STATUS_ACK;
	if (!IO_EXTRACT(R_PAR0_STATUS_DATA, busy, *info->reg_status_data))
		ret |= PARPORT_STATUS_BUSY;

	DPRINTK("* E100 PP %d: status register %04x\n",
		p->portnum, *info->reg_status_data);
	DPRINTK("* E100 PP %d: read_status %02x\n", p->portnum, ret);
	return ret;
}


static void
parport_etrax_enable_irq(struct parport *p)
{
	struct etrax100par_struct *info =
		(struct etrax100par_struct *)p->private_data;
	*info->irq_mask_set = info->irq_mask_tx;
	DPRINTK("* E100 PP %d: enable irq\n", p->portnum);
}


static void
parport_etrax_disable_irq(struct parport *p)
{