[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: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/parport/Kconfig

@@ -136,6 +136,18 @@ config PARPORT_SUNBPP
 	  found on many Sun machines. Note that many of the newer Ultras
 	  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
 	bool "IEEE 1284 transfer modes"
 	depends on PARPORT

drivers/parport/Makefile

@@ -17,4 +17,5 @@ obj-$(CONFIG_PARPORT_MFC3)	+= parport_mfc3.o
 obj-$(CONFIG_PARPORT_ATARI)	+= parport_atari.o
 obj-$(CONFIG_PARPORT_SUNBPP)	+= parport_sunbpp.o
 obj-$(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

drivers/parport/parport_ax88796.c

@@ -0,0 +1,443 @@
+/* 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");

include/linux/parport.h

@@ -127,6 +127,10 @@ struct amiga_parport_state {
        unsigned char statusdir;/* ciab.ddrb & 7 */
 };
 
+struct ax88796_parport_state {
+	unsigned char cpr;
+};
+
 struct ip32_parport_state {
 	unsigned int dcr;
 	unsigned int ecr;
@@ -138,6 +142,7 @@ struct parport_state {
 		/* ARC has no state. */
 		struct ax_parport_state ax;
 		struct amiga_parport_state amiga;
+		struct ax88796_parport_state ax88796;
 		/* Atari has not state. */
 		struct ip32_parport_state ip32;
 		void *misc;