Initial import

1 files changed, 224 insertions, 0 deletions

diff --git a/drivers/parport/parport_atari.c b/drivers/parport/parport_atari.c
new file mode 100644
index 000000000..a81cd2a27
--- /dev/null
+++ b/drivers/parport/parport_atari.c
@@ -0,0 +1,224 @@
+/* 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 <linux/interrupt.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;
+
+	local_irq_save(flags);
+	sound_ym.rd_data_reg_sel = 15;
+	data = sound_ym.rd_data_reg_sel;
+	local_irq_restore(flags);
+	return data;
+}
+
+static void
+parport_atari_write_data(struct parport *p, unsigned char data)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sound_ym.rd_data_reg_sel = 15;
+	sound_ym.wd_data = data;
+	local_irq_restore(flags);
+}
+
+static unsigned char
+parport_atari_read_control(struct parport *p)
+{
+	unsigned long flags;
+	unsigned char control = 0;
+
+	local_irq_save(flags);
+	sound_ym.rd_data_reg_sel = 14;
+	if (!(sound_ym.rd_data_reg_sel & (1 << 5)))
+		control = PARPORT_CONTROL_STROBE;
+	local_irq_restore(flags);
+	return control;
+}
+
+static void
+parport_atari_write_control(struct parport *p, unsigned char control)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	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);
+	local_irq_restore(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 ((st_mfp.par_dt_reg & 1 ? 0 : PARPORT_STATUS_BUSY) |
+		PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR);
+}
+
+static void
+parport_atari_init_state(struct pardevice *d, 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_enable_irq(struct parport *p)
+{
+	enable_irq(IRQ_MFP_BUSY);
+}
+
+static void
+parport_atari_disable_irq(struct parport *p)
+{
+	disable_irq(IRQ_MFP_BUSY);
+}
+
+static void
+parport_atari_data_forward(struct parport *p)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	/* Soundchip port B as output. */
+	sound_ym.rd_data_reg_sel = 7;
+	sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x40;
+	local_irq_restore(flags);
+}
+
+static void
+parport_atari_data_reverse(struct parport *p)
+{
+}
+
+static struct parport_operations parport_atari_ops = {
+	.write_data	= parport_atari_write_data,
+	.read_data	= parport_atari_read_data,
+
+	.write_control	= parport_atari_write_control,
+	.read_control	= parport_atari_read_control,
+	.frob_control	= parport_atari_frob_control,
+
+	.read_status	= parport_atari_read_status,
+
+	.enable_irq	= parport_atari_enable_irq,
+	.disable_irq	= parport_atari_disable_irq,
+
+	.data_forward	= parport_atari_data_forward,
+	.data_reverse	= parport_atari_data_reverse,
+
+	.init_state	= parport_atari_init_state,
+	.save_state	= parport_atari_save_state,
+	.restore_state	= parport_atari_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 __init parport_atari_init(void)
+{
+	struct parport *p;
+	unsigned long flags;
+
+	if (MACH_IS_ATARI) {
+		local_irq_save(flags);
+		/* 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);
+		local_irq_restore(flags);
+		/* MFP port I0 as input. */
+		st_mfp.data_dir &= ~1;
+		/* MFP port I0 interrupt on high->low edge. */
+		st_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 -ENODEV;
+		if (request_irq(IRQ_MFP_BUSY, parport_irq_handler, 0, p->name,
+				p)) {
+			parport_put_port (p);
+			return -ENODEV;
+		}
+
+		this_port = p;
+		printk(KERN_INFO "%s: Atari built-in port using irq\n", p->name);
+		parport_announce_port (p);
+
+		return 0;
+	}
+	return -ENODEV;
+}
+
+static void __exit parport_atari_exit(void)
+{
+	parport_remove_port(this_port);
+	if (this_port->irq != PARPORT_IRQ_NONE)
+		free_irq(IRQ_MFP_BUSY, this_port);
+	parport_put_port(this_port);
+}
+
+MODULE_AUTHOR("Andreas Schwab");
+MODULE_DESCRIPTION("Parport Driver for Atari builtin Port");
+MODULE_SUPPORTED_DEVICE("Atari builtin Parallel Port");
+MODULE_LICENSE("GPL");
+
+module_init(parport_atari_init)
+module_exit(parport_atari_exit)