parallel port support, found via google. tested by fenrir

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@412 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 345 insertions, 0 deletions

diff --git a/package/linux/kernel-source/drivers/parport/parport_splink.c b/package/linux/kernel-source/drivers/parport/parport_splink.c
new file mode 100644
index 000000000..0f5a81b85
--- /dev/null
+++ b/package/linux/kernel-source/drivers/parport/parport_splink.c
@@ -0,0 +1,345 @@
+/* Low-level parallel port routines for the ASUS WL-500g built-in port
+ *
+ * Author: Nuno Grilo <nuno.grilo@netcabo.pt>
+ * Based on parport_pc source
+ */
+  
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/parport.h>
+#include <linux/parport_pc.h>
+
+#define SPLINK_ADDRESS 0xBF800010
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DPRINTK  printk
+#else
+#define DPRINTK(stuff...)
+#endif
+
+
+/* __parport_splink_frob_control differs from parport_splink_frob_control in that
+ * it doesn't do any extra masking. */
+static __inline__ unsigned char __parport_splink_frob_control (struct parport *p,
+							   unsigned char mask,
+							   unsigned char val)
+{
+	struct parport_pc_private *priv = p->physport->private_data;
+	unsigned char *io = (unsigned char *) p->base;
+	unsigned char ctr = priv->ctr;
+#ifdef DEBUG_PARPORT
+	printk (KERN_DEBUG
+		"__parport_splink_frob_control(%02x,%02x): %02x -> %02x\n",
+		mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
+#endif
+	ctr = (ctr & ~mask) ^ val;
+	ctr &= priv->ctr_writable; /* only write writable bits. */
+	*(io+2) = ctr;
+	priv->ctr = ctr;	/* Update soft copy */
+	return ctr;
+}
+
+
+
+static void parport_splink_data_forward (struct parport *p)
+{
+	DPRINTK(KERN_DEBUG "parport_splink: parport_data_forward called\n");
+	__parport_splink_frob_control (p, 0x20, 0);
+}
+
+static void parport_splink_data_reverse (struct parport *p)
+{
+	DPRINTK(KERN_DEBUG "parport_splink: parport_data_forward called\n");
+	__parport_splink_frob_control (p, 0x20, 0x20);
+}
+
+/*
+static void parport_splink_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	DPRINTK(KERN_DEBUG "parport_splink: IRQ handler called\n");
+        parport_generic_irq(irq, (struct parport *) dev_id, regs);
+}
+*/
+
+static void parport_splink_enable_irq(struct parport *p)
+{
+	DPRINTK(KERN_DEBUG "parport_splink: parport_splink_enable_irq called\n");
+	__parport_splink_frob_control (p, 0x10, 0x10);
+}
+
+static void parport_splink_disable_irq(struct parport *p)
+{
+	DPRINTK(KERN_DEBUG "parport_splink: parport_splink_disable_irq called\n");
+	__parport_splink_frob_control (p, 0x10, 0);
+}
+
+static void parport_splink_init_state(struct pardevice *dev, struct parport_state *s)
+{
+	DPRINTK(KERN_DEBUG "parport_splink: parport_splink_init_state called\n");
+	s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
+	if (dev->irq_func &&
+            dev->port->irq != PARPORT_IRQ_NONE)
+                /* Set ackIntEn */
+                s->u.pc.ctr |= 0x10;
+}
+
+static void parport_splink_save_state(struct parport *p, struct parport_state *s)
+{
+	const struct parport_pc_private *priv = p->physport->private_data;
+	DPRINTK(KERN_DEBUG "parport_splink: parport_splink_save_state called\n");
+	s->u.pc.ctr = priv->ctr;
+}
+
+static void parport_splink_restore_state(struct parport *p, struct parport_state *s)
+{
+	struct parport_pc_private *priv = p->physport->private_data;
+	unsigned char *io = (unsigned char *) p->base;
+	unsigned char ctr = s->u.pc.ctr;
+
+	DPRINTK(KERN_DEBUG "parport_splink: parport_splink_restore_state called\n");
+        *(io+2) = ctr;
+	priv->ctr = ctr;
+}
+
+static void parport_splink_setup_interrupt(void) {
+        return;
+}
+
+static void parport_splink_write_data(struct parport *p, unsigned char d) {
+	DPRINTK(KERN_DEBUG "parport_splink: write data called\n");
+        unsigned char *io = (unsigned char *) p->base;
+        *io = d;
+}
+
+static unsigned char parport_splink_read_data(struct parport *p) {
+	DPRINTK(KERN_DEBUG "parport_splink: read data called\n");
+        unsigned char *io = (unsigned char *) p->base;
+        return *io;
+}
+
+static void parport_splink_write_control(struct parport *p, unsigned char d)
+{
+	const unsigned char wm = (PARPORT_CONTROL_STROBE |
+				  PARPORT_CONTROL_AUTOFD |
+				  PARPORT_CONTROL_INIT |
+				  PARPORT_CONTROL_SELECT);
+
+	DPRINTK(KERN_DEBUG "parport_splink: write control called\n");
+	/* Take this out when drivers have adapted to the newer interface. */
+	if (d & 0x20) {
+		printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
+			p->name, p->cad->name);
+		parport_splink_data_reverse (p);
+	}
+
+	__parport_splink_frob_control (p, wm, d & wm);
+}
+
+static unsigned char parport_splink_read_control(struct parport *p)
+{
+	const unsigned char wm = (PARPORT_CONTROL_STROBE |
+				  PARPORT_CONTROL_AUTOFD |
+				  PARPORT_CONTROL_INIT |
+				  PARPORT_CONTROL_SELECT);
+	DPRINTK(KERN_DEBUG "parport_splink: read control called\n");
+	const struct parport_pc_private *priv = p->physport->private_data;
+	return priv->ctr & wm; /* Use soft copy */
+}
+
+static unsigned char parport_splink_frob_control (struct parport *p, unsigned char mask,
+				       unsigned char val)
+{
+	const unsigned char wm = (PARPORT_CONTROL_STROBE |
+				  PARPORT_CONTROL_AUTOFD |
+				  PARPORT_CONTROL_INIT |
+				  PARPORT_CONTROL_SELECT);
+
+	DPRINTK(KERN_DEBUG "parport_splink: frob control called\n");
+	/* Take this out when drivers have adapted to the newer interface. */
+	if (mask & 0x20) {
+		printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
+			p->name, p->cad->name,
+			(val & 0x20) ? "reverse" : "forward");
+		if (val & 0x20)
+			parport_splink_data_reverse (p);
+		else
+			parport_splink_data_forward (p);
+	}
+
+	/* Restrict mask and val to control lines. */
+	mask &= wm;
+	val &= wm;
+
+	return __parport_splink_frob_control (p, mask, val);
+}
+
+static unsigned char parport_splink_read_status(struct parport *p)
+{
+	DPRINTK(KERN_DEBUG "parport_splink: read status called\n");
+        unsigned char *io = (unsigned char *) p->base;
+        return *(io+1);
+}
+
+static void parport_splink_inc_use_count(void)
+{
+#ifdef MODULE
+	MOD_INC_USE_COUNT;
+#endif
+}
+
+static void parport_splink_dec_use_count(void)
+{
+#ifdef MODULE
+	MOD_DEC_USE_COUNT;
+#endif
+}
+
+static struct parport_operations parport_splink_ops = 
+{
+	parport_splink_write_data,
+	parport_splink_read_data,
+
+	parport_splink_write_control,
+	parport_splink_read_control,
+	parport_splink_frob_control,
+
+	parport_splink_read_status,
+
+	parport_splink_enable_irq,
+	parport_splink_disable_irq,
+
+	parport_splink_data_forward,
+	parport_splink_data_reverse,
+
+	parport_splink_init_state,
+	parport_splink_save_state,
+	parport_splink_restore_state,
+
+	parport_splink_inc_use_count,
+	parport_splink_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 -------------------------------- */
+
+static struct parport *parport_splink_probe_port (unsigned long int base)
+{
+	struct parport_pc_private *priv;
+	struct parport_operations *ops;
+	struct parport *p;
+
+	if (check_mem_region(base, 3)) {
+		printk (KERN_DEBUG "parport (0x%lx): iomem region not available\n", base);
+		return NULL;
+	}
+	priv = kmalloc (sizeof (struct parport_pc_private), GFP_KERNEL);
+	if (!priv) {
+		printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base);
+		return NULL;
+	}
+	ops = kmalloc (sizeof (struct parport_operations), GFP_KERNEL);
+	if (!ops) {
+		printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n",
+			base);
+		kfree (priv);
+		return NULL;
+	}
+	memcpy (ops, &parport_splink_ops, sizeof (struct parport_operations));
+	priv->ctr = 0xc;
+	priv->ctr_writable = 0xff;
+
+	if (!(p = parport_register_port(base, PARPORT_IRQ_NONE,
+					PARPORT_DMA_NONE, ops))) {
+		printk (KERN_DEBUG "parport (0x%lx): registration failed!\n",
+			base);
+		kfree (priv);
+		kfree (ops);
+		return NULL;
+	}
+
+	p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
+	p->size = (p->modes & PARPORT_MODE_EPP)?8:3;
+	p->private_data = priv;
+
+	parport_proc_register(p);
+	request_mem_region (p->base, 3, p->name);
+
+	/* Done probing.  Now put the port into a sensible start-up state. */
+	parport_splink_write_data(p, 0);
+	parport_splink_data_forward (p);
+
+	/* Now that we've told the sharing engine about the port, and
+	   found out its characteristics, let the high-level drivers
+	   know about it. */
+	parport_announce_port (p);
+
+	DPRINTK(KERN_DEBUG "parport (0x%lx): init ok!\n",
+		base);
+	return p;
+}
+
+static void parport_splink_unregister_port(struct parport *p) {
+	struct parport_pc_private *priv = p->private_data;
+	struct parport_operations *ops = p->ops;
+
+        if (p->irq != PARPORT_IRQ_NONE)
+		free_irq(p->irq, p);
+	release_mem_region(p->base, 3);
+        parport_proc_unregister(p);
+        kfree (priv);
+        parport_unregister_port(p);
+        kfree (ops);
+}
+
+
+int parport_splink_init(void)
+{	
+        int ret;
+        
+	DPRINTK(KERN_DEBUG "parport_splink init called\n");
+        parport_splink_setup_interrupt();
+        ret = !parport_splink_probe_port(SPLINK_ADDRESS);
+        
+        return ret;
+}
+
+void parport_splink_cleanup(void) {
+        struct parport *p = parport_enumerate(), *tmp;
+	DPRINTK(KERN_DEBUG "parport_splink cleanup called\n");
+        if (p->size) {
+                if (p->modes & PARPORT_MODE_PCSPP) {
+                        while(p) {
+                                tmp = p->next;
+                                parport_splink_unregister_port(p);
+                                p = tmp;
+                        }
+                }
+        }
+}
+
+MODULE_AUTHOR("Nuno Grilo <nuno.grilo@netcabo.pt>");
+MODULE_DESCRIPTION("Parport Driver for ASUS WL-500g router builtin Port");
+MODULE_SUPPORTED_DEVICE("ASUS WL-500g builtin Parallel Port");
+MODULE_LICENSE("GPL");
+
+module_init(parport_splink_init)
+module_exit(parport_splink_cleanup)
+