patch-2.3.12 linux/drivers/parport/parport_arc.c

• Lines: 150
• Date: Tue Jul 27 13:55:52 1999
• Orig file: v2.3.11/linux/drivers/parport/parport_arc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.11/linux/drivers/parport/parport_arc.c linux/drivers/parport/parport_arc.c
@@ -0,0 +1,149 @@
+/* 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/malloc.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_interrupt,
+
+	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;
+}