提交 ad4063b0 编写于 作者: B Ben Dooks 提交者: Linus Torvalds

[PATCH] AX88796 parallel port driver

Driver for the simple parallel port interface on the Asix AX88796 chip on
an platform_bus.

[akpm@osdl.org: x86_64 build fix]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 11e64757
...@@ -136,6 +136,18 @@ config PARPORT_SUNBPP ...@@ -136,6 +136,18 @@ config PARPORT_SUNBPP
found on many Sun machines. Note that many of the newer Ultras found on many Sun machines. Note that many of the newer Ultras
actually have pc style hardware instead. actually have pc style hardware instead.
config PARPORT_AX88796
tristate "AX88796 Parallel Port"
depends on PARPORT
select PARPORT_NOT_PC
help
Say Y here if you need support for the parallel port hardware on
the AX88796 network controller chip. This code is also available
as a module (say M), called parport_ax88796.
The driver is not dependant on the AX88796 network driver, and
should not interfere with the networking functions of the chip.
config PARPORT_1284 config PARPORT_1284
bool "IEEE 1284 transfer modes" bool "IEEE 1284 transfer modes"
depends on PARPORT depends on PARPORT
......
...@@ -17,4 +17,5 @@ obj-$(CONFIG_PARPORT_MFC3) += parport_mfc3.o ...@@ -17,4 +17,5 @@ obj-$(CONFIG_PARPORT_MFC3) += parport_mfc3.o
obj-$(CONFIG_PARPORT_ATARI) += parport_atari.o obj-$(CONFIG_PARPORT_ATARI) += parport_atari.o
obj-$(CONFIG_PARPORT_SUNBPP) += parport_sunbpp.o obj-$(CONFIG_PARPORT_SUNBPP) += parport_sunbpp.o
obj-$(CONFIG_PARPORT_GSC) += parport_gsc.o obj-$(CONFIG_PARPORT_GSC) += parport_gsc.o
obj-$(CONFIG_PARPORT_IP32) += parport_ip32.o obj-$(CONFIG_PARPORT_AX88796) += parport_ax88796.o
obj-$(CONFIG_PARPORT_IP32) += parport_ip32.o
\ No newline at end of file
/* 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 irqreturn_t
parport_ax88796_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
parport_generic_irq(irq, dev_id, regs);
return IRQ_HANDLED;
}
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;
struct ax_drvdata *dd;
struct parport *pp = NULL;
struct resource *res;
unsigned long size;
int spacing;
int irq;
int ret;
dd = kzalloc(sizeof(struct ax_drvdata), GFP_KERNEL);
if (dd == NULL) {
dev_err(_dev, "no memory for private data\n");
return -ENOMEM;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(_dev, "no MEM specified\n");
ret = -ENXIO;
goto exit_mem;
}
size = (res->end - res->start) + 1;
spacing = size / 3;
dd->io = request_mem_region(res->start, size, pdev->name);
if (dd->io == NULL) {
dev_err(_dev, "cannot reserve memory\n");
ret = -ENXIO;
goto exit_mem;
}
dd->base = ioremap(res->start, size);
if (dd->base == NULL) {
dev_err(_dev, "cannot ioremap region\n");
ret = -ENXIO;
goto exit_res;
}
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
irq = PARPORT_IRQ_NONE;
pp = parport_register_port((unsigned long)dd->base, irq,
PARPORT_DMA_NONE,
&parport_ax88796_ops);
if (pp == NULL) {
dev_err(_dev, "failed to register parallel port\n");
ret = -ENOMEM;
goto exit_unmap;
}
pp->private_data = dd;
dd->parport = pp;
dd->dev = _dev;
dd->spp_data = dd->base;
dd->spp_spr = dd->base + (spacing * 1);
dd->spp_cpr = dd->base + (spacing * 2);
/* initialise the port controls */
writeb(AX_CPR_STRB, dd->spp_cpr);
if (irq >= 0) {
/* request irq */
ret = request_irq(irq, parport_ax88796_interrupt,
SA_TRIGGER_FALLING, pdev->name, pp);
if (ret < 0)
goto exit_port;
dd->irq_enabled = 1;
}
platform_set_drvdata(pdev, pp);
dev_info(_dev, "attached parallel port driver\n");
parport_announce_port(pp);
return 0;
exit_port:
parport_remove_port(pp);
exit_unmap:
iounmap(dd->base);
exit_res:
release_resource(dd->io);
kfree(dd->io);
exit_mem:
kfree(dd);
return ret;
}
static int parport_ax88796_remove(struct platform_device *pdev)
{
struct parport *p = platform_get_drvdata(pdev);
struct ax_drvdata *dd = pp_to_drv(p);
free_irq(p->irq, p);
parport_remove_port(p);
iounmap(dd->base);
release_resource(dd->io);
kfree(dd->io);
kfree(dd);
return 0;
}
#ifdef CONFIG_PM
static int parport_ax88796_suspend(struct platform_device *dev,
pm_message_t state)
{
struct parport *p = platform_get_drvdata(dev);
struct ax_drvdata *dd = pp_to_drv(p);
parport_ax88796_save_state(p, &dd->suspend);
writeb(AX_CPR_nDOE | AX_CPR_STRB, dd->spp_cpr);
return 0;
}
static int parport_ax88796_resume(struct platform_device *dev)
{
struct parport *p = platform_get_drvdata(dev);
struct ax_drvdata *dd = pp_to_drv(p);
parport_ax88796_restore_state(p, &dd->suspend);
return 0;
}
#else
#define parport_ax88796_suspend NULL
#define parport_ax88796_resume NULL
#endif
static struct platform_driver axdrv = {
.driver = {
.name = "ax88796-pp",
.owner = THIS_MODULE,
},
.probe = parport_ax88796_probe,
.remove = parport_ax88796_remove,
.suspend = parport_ax88796_suspend,
.resume = parport_ax88796_resume,
};
static int __init parport_ax88796_init(void)
{
return platform_driver_register(&axdrv);
}
static void __exit parport_ax88796_exit(void)
{
platform_driver_unregister(&axdrv);
}
module_init(parport_ax88796_init)
module_exit(parport_ax88796_exit)
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("AX88796 Parport parallel port driver");
MODULE_LICENSE("GPL");
...@@ -127,6 +127,10 @@ struct amiga_parport_state { ...@@ -127,6 +127,10 @@ struct amiga_parport_state {
unsigned char statusdir;/* ciab.ddrb & 7 */ unsigned char statusdir;/* ciab.ddrb & 7 */
}; };
struct ax88796_parport_state {
unsigned char cpr;
};
struct ip32_parport_state { struct ip32_parport_state {
unsigned int dcr; unsigned int dcr;
unsigned int ecr; unsigned int ecr;
...@@ -138,6 +142,7 @@ struct parport_state { ...@@ -138,6 +142,7 @@ struct parport_state {
/* ARC has no state. */ /* ARC has no state. */
struct ax_parport_state ax; struct ax_parport_state ax;
struct amiga_parport_state amiga; struct amiga_parport_state amiga;
struct ax88796_parport_state ax88796;
/* Atari has not state. */ /* Atari has not state. */
struct ip32_parport_state ip32; struct ip32_parport_state ip32;
void *misc; void *misc;
......
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