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/* linux/drivers/parport/parport_ax88796.c
*
* (c) 2005,2006 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/parport.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/irq.h>
#define AX_SPR_BUSY (1<<7)
#define AX_SPR_ACK (1<<6)
#define AX_SPR_PE (1<<5)
#define AX_SPR_SLCT (1<<4)
#define AX_SPR_ERR (1<<3)
#define AX_CPR_nDOE (1<<5)
#define AX_CPR_SLCTIN (1<<3)
#define AX_CPR_nINIT (1<<2)
#define AX_CPR_ATFD (1<<1)
#define AX_CPR_STRB (1<<0)
struct ax_drvdata {
struct parport *parport;
struct parport_state suspend;
struct device *dev;
struct resource *io;
unsigned char irq_enabled;
void __iomem *base;
void __iomem *spp_data;
void __iomem *spp_spr;
void __iomem *spp_cpr;
};
static inline struct ax_drvdata *pp_to_drv(struct parport *p)
{
return p->private_data;
}
static unsigned char
parport_ax88796_read_data(struct parport *p)
{
struct ax_drvdata *dd = pp_to_drv(p);
return readb(dd->spp_data);
}
static void
parport_ax88796_write_data(struct parport *p, unsigned char data)
{
struct ax_drvdata *dd = pp_to_drv(p);
writeb(data, dd->spp_data);
}
static unsigned char
parport_ax88796_read_control(struct parport *p)
{
struct ax_drvdata *dd = pp_to_drv(p);
unsigned int cpr = readb(dd->spp_cpr);
unsigned int ret = 0;
if (!(cpr & AX_CPR_STRB))
ret |= PARPORT_CONTROL_STROBE;
if (!(cpr & AX_CPR_ATFD))
ret |= PARPORT_CONTROL_AUTOFD;
if (cpr & AX_CPR_nINIT)
ret |= PARPORT_CONTROL_INIT;
if (!(cpr & AX_CPR_SLCTIN))
ret |= PARPORT_CONTROL_SELECT;
return ret;
}
static void
parport_ax88796_write_control(struct parport *p, unsigned char control)
{
struct ax_drvdata *dd = pp_to_drv(p);
unsigned int cpr = readb(dd->spp_cpr);
cpr &= AX_CPR_nDOE;
if (!(control & PARPORT_CONTROL_STROBE))
cpr |= AX_CPR_STRB;
if (!(control & PARPORT_CONTROL_AUTOFD))
cpr |= AX_CPR_ATFD;
if (control & PARPORT_CONTROL_INIT)
cpr |= AX_CPR_nINIT;
if (!(control & PARPORT_CONTROL_SELECT))
cpr |= AX_CPR_SLCTIN;
dev_dbg(dd->dev, "write_control: ctrl=%02x, cpr=%02x\n", control, cpr);
writeb(cpr, dd->spp_cpr);
if (parport_ax88796_read_control(p) != control) {
dev_err(dd->dev, "write_control: read != set (%02x, %02x)\n",
parport_ax88796_read_control(p), control);
}
}
static unsigned char
parport_ax88796_read_status(struct parport *p)
{
struct ax_drvdata *dd = pp_to_drv(p);
unsigned int status = readb(dd->spp_spr);
unsigned int ret = 0;
if (status & AX_SPR_BUSY)
ret |= PARPORT_STATUS_BUSY;
if (status & AX_SPR_ACK)
ret |= PARPORT_STATUS_ACK;
if (status & AX_SPR_ERR)
ret |= PARPORT_STATUS_ERROR;
if (status & AX_SPR_SLCT)
ret |= PARPORT_STATUS_SELECT;
if (status & AX_SPR_PE)
ret |= PARPORT_STATUS_PAPEROUT;
return ret;
}
static unsigned char
parport_ax88796_frob_control(struct parport *p, unsigned char mask,
unsigned char val)
{
struct ax_drvdata *dd = pp_to_drv(p);
unsigned char old = parport_ax88796_read_control(p);
dev_dbg(dd->dev, "frob: mask=%02x, val=%02x, old=%02x\n",
mask, val, old);
parport_ax88796_write_control(p, (old & ~mask) | val);
return old;
}
static void
parport_ax88796_enable_irq(struct parport *p)
{
struct ax_drvdata *dd = pp_to_drv(p);
unsigned long flags;
local_irq_save(flags);
if (!dd->irq_enabled) {
enable_irq(p->irq);
dd->irq_enabled = 1;
}
local_irq_restore(flags);
}
static void
parport_ax88796_disable_irq(struct parport *p)
{
struct ax_drvdata *dd = pp_to_drv(p);
unsigned long flags;
local_irq_save(flags);
if (dd->irq_enabled) {
disable_irq(p->irq);
dd->irq_enabled = 0;
}
local_irq_restore(flags);
}
static void
parport_ax88796_data_forward(struct parport *p)
{
struct ax_drvdata *dd = pp_to_drv(p);
void __iomem *cpr = dd->spp_cpr;
writeb((readb(cpr) & ~AX_CPR_nDOE), cpr);
}
static void
parport_ax88796_data_reverse(struct parport *p)
{
struct ax_drvdata *dd = pp_to_drv(p);
void __iomem *cpr = dd->spp_cpr;
writeb(readb(cpr) | AX_CPR_nDOE, cpr);
}
static void
parport_ax88796_init_state(struct pardevice *d, struct parport_state *s)
{
struct ax_drvdata *dd = pp_to_drv(d->port);
memset(s, 0, sizeof(struct parport_state));
dev_dbg(dd->dev, "init_state: %p: state=%p\n", d, s);
s->u.ax88796.cpr = readb(dd->spp_cpr);
}
static void
parport_ax88796_save_state(struct parport *p, struct parport_state *s)
{
struct ax_drvdata *dd = pp_to_drv(p);
dev_dbg(dd->dev, "save_state: %p: state=%p\n", p, s);
s->u.ax88796.cpr = readb(dd->spp_cpr);
}
static void
parport_ax88796_restore_state(struct parport *p, struct parport_state *s)
{
struct ax_drvdata *dd = pp_to_drv(p);
dev_dbg(dd->dev, "restore_state: %p: state=%p\n", p, s);
writeb(s->u.ax88796.cpr, dd->spp_cpr);
}
static struct parport_operations parport_ax88796_ops = {
.write_data = parport_ax88796_write_data,
.read_data = parport_ax88796_read_data,
.write_control = parport_ax88796_write_control,
.read_control = parport_ax88796_read_control,
.frob_control = parport_ax88796_frob_control,
.read_status = parport_ax88796_read_status,
.enable_irq = parport_ax88796_enable_irq,
.disable_irq = parport_ax88796_disable_irq,
.data_forward = parport_ax88796_data_forward,
.data_reverse = parport_ax88796_data_reverse,
.init_state = parport_ax88796_init_state,
.save_state = parport_ax88796_save_state,
.restore_state = parport_ax88796_restore_state,
.epp_write_data = parport_ieee1284_epp_write_data,
.epp_read_data = parport_ieee1284_epp_read_data,
.epp_write_addr = parport_ieee1284_epp_write_addr,
.epp_read_addr = parport_ieee1284_epp_read_addr,
.ecp_write_data = parport_ieee1284_ecp_write_data,
.ecp_read_data = parport_ieee1284_ecp_read_data,
.ecp_write_addr = parport_ieee1284_ecp_write_addr,
.compat_write_data = parport_ieee1284_write_compat,
.nibble_read_data = parport_ieee1284_read_nibble,
.byte_read_data = parport_ieee1284_read_byte,
.owner = THIS_MODULE,
};
static int parport_ax88796_probe(struct platform_device *pdev)
{
struct device *_dev = &pdev->dev;
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