patch-2.2.8 linux/drivers/misc/parport_atari.c

• Lines: 264
• Date: Tue May 11 09:55:49 1999
• Orig file: v2.2.7/linux/drivers/misc/parport_atari.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.7/linux/drivers/misc/parport_atari.c linux/drivers/misc/parport_atari.c
@@ -0,0 +1,263 @@
+/* Low-level parallel port routines for the Atari builtin port
+ *
+ * Author: Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
+ *
+ * Based on parport_amiga.c.
+ *
+ * The built-in Atari parallel port provides one port at a fixed address
+ * with 8 output data lines (D0 - D7), 1 output control line (STROBE)
+ * and 1 input status line (BUSY) able to cause an interrupt.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/parport.h>
+#include <asm/setup.h>
+#include <asm/atarihw.h>
+#include <asm/irq.h>
+#include <asm/atariints.h>
+
+static struct parport *this_port = NULL;
+
+static unsigned char
+parport_atari_read_data(struct parport *p)
+{
+	unsigned long flags;
+	unsigned char data;
+
+	save_flags(flags);
+	cli();
+	sound_ym.rd_data_reg_sel = 15;
+	data = sound_ym.rd_data_reg_sel;
+	restore_flags(flags);
+	return data;
+}
+
+static void
+parport_atari_write_data(struct parport *p, unsigned char data)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	sound_ym.rd_data_reg_sel = 15;
+	sound_ym.wd_data = data;
+	restore_flags(flags);
+}
+
+static unsigned char
+parport_atari_read_control(struct parport *p)
+{
+	unsigned long flags;
+	unsigned char control = 0;
+
+	save_flags(flags);
+	cli();
+	sound_ym.rd_data_reg_sel = 14;
+	if (!(sound_ym.rd_data_reg_sel & (1 << 5)))
+		control = PARPORT_CONTROL_STROBE;
+	restore_flags(flags);
+	return control;
+}
+
+static void
+parport_atari_write_control(struct parport *p, unsigned char control)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	sound_ym.rd_data_reg_sel = 14;
+	if (control & PARPORT_CONTROL_STROBE)
+		sound_ym.wd_data = sound_ym.rd_data_reg_sel & ~(1 << 5);
+	else
+		sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5);
+	restore_flags(flags);
+}
+
+static unsigned char
+parport_atari_frob_control(struct parport *p, unsigned char mask,
+			   unsigned char val)
+{
+	unsigned char old = parport_atari_read_control(p);
+	parport_atari_write_control(p, (old & ~mask) ^ val);
+	return old;
+}
+
+static unsigned char
+parport_atari_read_status(struct parport *p)
+{
+	return ((mfp.par_dt_reg & 1 ? 0 : PARPORT_STATUS_BUSY) |
+		PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR);
+}
+
+static void
+parport_atari_write_status(struct parport *p, unsigned char status)
+{
+}
+
+static void
+parport_atari_init_state(struct parport_state *s)
+{
+}
+
+static void
+parport_atari_save_state(struct parport *p, struct parport_state *s)
+{
+}
+
+static void
+parport_atari_restore_state(struct parport *p, struct parport_state *s)
+{
+}
+
+static void
+parport_atari_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	parport_generic_irq(irq, (struct parport *) dev_id, regs);
+}
+
+static void
+parport_atari_release_resources(struct parport *p)
+{
+	if (p->irq != PARPORT_IRQ_NONE)
+		free_irq(IRQ_MFP_BUSY, p);
+}
+
+static int
+parport_atari_claim_resources(struct parport *p)
+{
+	return request_irq(IRQ_MFP_BUSY, parport_atari_interrupt,
+			   IRQ_TYPE_SLOW, p->name, p);
+}
+
+static void
+parport_atari_inc_use_count(void)
+{
+	MOD_INC_USE_COUNT;
+}
+
+static void
+parport_atari_dec_use_count(void)
+{
+	MOD_DEC_USE_COUNT;
+}
+
+static void
+parport_atari_fill_inode(struct inode *inode, int fill)
+{
+#ifdef MODULE
+	if (fill)
+		MOD_INC_USE_COUNT;
+	else
+		MOD_DEC_USE_COUNT;
+#endif
+}
+
+static struct parport_operations parport_atari_ops = {
+	parport_atari_write_data,
+	parport_atari_read_data,
+
+	parport_atari_write_control,
+	parport_atari_read_control,
+	parport_atari_frob_control,
+
+	NULL, /* write_econtrol */
+	NULL, /* read_econtrol */
+	NULL, /* frob_econtrol */
+
+	parport_atari_write_status,
+	parport_atari_read_status,
+
+	NULL, /* write fifo */
+	NULL, /* read fifo */
+
+	NULL, /* change_mode */
+
+	parport_atari_release_resources,
+	parport_atari_claim_resources,
+
+	NULL, /* epp_write_data */
+	NULL, /* epp_read_data */
+	NULL, /* epp_write_addr */
+	NULL, /* epp_read_addr */
+	NULL, /* epp_check_timeout */
+
+	NULL, /* epp_write_block */
+	NULL, /* epp_read_block */
+
+	NULL, /* ecp_write_block */
+	NULL, /* ecp_read_block */
+
+	parport_atari_init_state,
+	parport_atari_save_state,
+	parport_atari_restore_state,
+
+	NULL, /* enable_irq */
+	NULL, /* disable_irq */
+	parport_atari_interrupt,
+
+	parport_atari_inc_use_count,
+	parport_atari_dec_use_count,
+	parport_atari_fill_inode
+};
+
+
+int __init
+parport_atari_init(void)
+{
+	struct parport *p;
+	unsigned long flags;
+
+	if (MACH_IS_ATARI) {
+		save_flags(flags);
+		cli();
+		/* Soundchip port A/B as output. */
+		sound_ym.rd_data_reg_sel = 7;
+		sound_ym.wd_data = (sound_ym.rd_data_reg_sel & 0x3f) | 0xc0;
+		/* STROBE high. */
+		sound_ym.rd_data_reg_sel = 14;
+		sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5);
+		restore_flags(flags);
+		/* MFP port I0 as input. */
+		mfp.data_dir &= ~1;
+		/* MFP port I0 interrupt on high->low edge. */
+		mfp.active_edge &= ~1;
+		p = parport_register_port((unsigned long)&sound_ym.wd_data,
+					  IRQ_MFP_BUSY, PARPORT_DMA_NONE,
+					  &parport_atari_ops);
+		if (!p)
+			return 0;
+		this_port = p;
+		printk(KERN_INFO "%s: Atari built-in port using irq\n", p->name);
+		parport_proc_register(p);
+		p->flags |= PARPORT_FLAG_COMA;
+
+		if (parport_probe_hook)
+			(*parport_probe_hook)(p);
+		return 1;
+	}
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Andreas Schwab");
+MODULE_DESCRIPTION("Parport Driver for Atari builtin Port");
+MODULE_SUPPORTED_DEVICE("Atari builtin Parallel Port");
+
+int
+init_module(void)
+{
+	return parport_atari_init() ? 0 : -ENODEV;
+}
+
+void
+cleanup_module(void)
+{
+	if (!(this_port->flags & PARPORT_FLAG_COMA))
+		parport_quiesce(this_port);
+	parport_proc_unregister(this_port);
+	parport_unregister_port(this_port);
+}
+#endif