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/* Low-level parallel port routines for Archimedes onboard hardware

 *

 * Author: Phil Blundell <Philip.Blundell@pobox.com>

 */

/* This driver is for the parallel port hardware found on Acorn's old

 * range of Archimedes machines.  The A5000 and newer systems have PC-style

 * I/O hardware and should use the parport_pc driver instead.

 *

 * The Acorn printer port hardware is very simple.  There is a single 8-bit

 * write-only latch for the data port and control/status bits are handled

 * with various auxilliary input and output lines.  The port is not

 * bidirectional, does not support any modes other than SPP, and has only

 * a subset of the standard printer control lines connected.

 */

#include <linux/threads.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/ioport.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/parport.h>

#include <asm/ptrace.h>

#include <asm/io.h>

#include <asm/arch/oldlatches.h>

#include <asm/arch/irqs.h>

#define DATA_ADDRESS    0x3350010

/* This is equivalent to the above and only used for request_region. */

#define PORT_BASE       0x80000000 | ((DATA_ADDRESS - IO_BASE) >> 2)

/* The hardware can't read from the data latch, so we must use a soft

   copy. */

static unsigned char data_copy;

/* These are pretty simple. We know the irq is never shared and the

   kernel does all the magic that's required. */

static void arc_enable_irq(struct parport *p)

{

        enable_irq(p->irq);

}

static void arc_disable_irq(struct parport *p)

{

        disable_irq(p->irq);

}

static void arc_interrupt(int irq, void *dev_id, struct pt_regs *regs)

{

        parport_generic_irq(irq, (struct parport *) dev_id, regs);

}

static void arc_write_data(struct parport *p, unsigned char data)

{

        data_copy = data;

        outb_t(data, DATA_LATCH);

}

static unsigned char arc_read_data(struct parport *p)

{

        return data_copy;

}

static void arc_inc_use_count(void)

{

#ifdef MODULE

        MOD_INC_USE_COUNT;

#endif

}

static void arc_dec_use_count(void)

{

#ifdef MODULE

        MOD_DEC_USE_COUNT;

#endif

}

static struct parport_operations parport_arc_ops =

{

        arc_write_data,

        arc_read_data,

        arc_write_control,

        arc_read_control,

        arc_frob_control,

        arc_read_status,

        arc_enable_irq,

        arc_disable_irq,

        arc_data_forward,

        arc_data_reverse,

        arc_init_state,

        arc_save_state,

        arc_restore_state,

        arc_inc_use_count,

        arc_dec_use_count,

        parport_ieee1284_epp_write_data,

        parport_ieee1284_epp_read_data,

        parport_ieee1284_epp_write_addr,

        parport_ieee1284_epp_read_addr,

        parport_ieee1284_ecp_write_data,

        parport_ieee1284_ecp_read_data,

        parport_ieee1284_ecp_write_addr,

        parport_ieee1284_write_compat,

        parport_ieee1284_read_nibble,

        parport_ieee1284_read_byte,

};

/* --- Initialisation code -------------------------------- */

int parport_arc_init(void)

{

        /* Archimedes hardware provides only one port, at a fixed address */

        struct parport *p;

        if (check_region(PORT_BASE, 1))

                return 0;

        p = parport_register_port (PORT_BASE, IRQ_PRINTERACK,

                                   PARPORT_DMA_NONE, &parport_arc_ops);

        if (!p)

                return 0;

        p->modes = PARPORT_MODE_ARCSPP;

        p->size = 1;

        printk(KERN_INFO "%s: Archimedes on-board port, using irq %d\n",

               p->irq);

        parport_proc_register(p);

        /* Tell the high-level drivers about the port. */

        parport_announce_port (p);

        return 1;

}