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

• Lines: 296
• Date: Tue Jul 27 13:55:52 1999
• Orig file: v2.3.11/linux/drivers/parport/parport_amiga.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.11/linux/drivers/parport/parport_amiga.c linux/drivers/parport/parport_amiga.c
@@ -0,0 +1,295 @@
+/* Low-level parallel port routines for the Amiga buildin port
+ *
+ * Author: Joerg Dorchain <dorchain@wirbel.com>
+ *
+ * This is a complete rewrite of the code, but based heaviy upon the old
+ * lp_intern. code.
+ *
+ * The built-in Amiga parallel port provides one port at a fixed address
+ * with 8 bisdirecttional data lines (D0 - D7) and 3 bidirectional status
+ * lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically in
+ * hardware when the data register is accessed), and 1 input control line
+ * /ACK, able to cause an interrupt, but both not directly settable by
+ * software.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/parport.h>
+#include <asm/setup.h>
+#include <asm/amigahw.h>
+#include <asm/irq.h>
+#include <asm/amigaints.h>
+
+#undef DEBUG
+#ifdef DEBUG
+#define DPRINTK printk
+#else
+static inline int DPRINTK() {return 0;}
+#endif
+
+static struct parport *this_port = NULL;
+
+static void amiga_write_data(struct parport *p, unsigned char data)
+{
+DPRINTK("write_data %c\n",data);
+	/* Triggers also /STROBE. This behavior cannot be changed */
+	ciaa.prb = data;
+}
+
+static unsigned char amiga_read_data(struct parport *p)
+{
+	/* Triggers also /STROBE. This behavior cannot be changed */
+	return ciaa.prb;
+}
+
+#if 0
+static unsigned char control_pc_to_amiga(unsigned char control)
+{
+	unsigned char ret = 0;
+
+	if (control & PARPORT_CONTROL_DIRECTION) /* XXX: What is this? */
+		;
+	if (control & PARPORT_CONTROL_INTEN) /* XXX: What is INTEN? */
+		;
+	if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
+		;
+	if (control & PARPORT_CONTROL_INIT) /* INITP */
+		/* reset connected to cpu reset pin */;
+	if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
+		/* Not connected */;
+	if (control & PARPORT_CONTROL_STROBE) /* Strobe */
+		/* Handled only directly by hardware */;
+	return ret;
+}
+#endif
+
+static unsigned char control_amiga_to_pc(unsigned char control)
+{
+	return PARPORT_CONTROL_INTEN | PARPORT_CONTROL_SELECT |
+	      PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
+	/* fake value: interrupt enable, select in, no reset,
+	no autolf, no strobe - seems to be closest the wiring diagram */
+}
+
+static void amiga_write_control(struct parport *p, unsigned char control)
+{
+DPRINTK("write_control %02x\n",control);
+	/* No implementation possible */
+}
+	
+static unsigned char amiga_read_control( struct parport *p)
+{
+DPRINTK("read_control \n");
+	return control_amiga_to_pc(0);
+}
+
+static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
+{
+	unsigned char old;
+
+DPRINTK("frob_control mask %02x, value %02x\n",mask,val);
+	old = amiga_read_control(p);
+	amiga_write_control(p, (old & ~mask) ^ val);
+	return old;
+}
+
+
+static unsigned char status_pc_to_amiga(unsigned char status)
+{
+	unsigned char ret = 1;
+
+	if (status & PARPORT_STATUS_BUSY) /* Busy */
+		ret &= ~1;
+	if (status & PARPORT_STATUS_ACK) /* Ack */
+		/* handled in hardware */;
+	if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
+		ret |= 2;
+	if (status & PARPORT_STATUS_SELECT) /* select */
+		ret |= 4;
+	if (status & PARPORT_STATUS_ERROR) /* error */
+		/* not connected */;
+	return ret;
+}
+
+static unsigned char status_amiga_to_pc(unsigned char status)
+{
+	unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;
+
+	if (status & 1) /* Busy */
+		ret &= ~PARPORT_STATUS_BUSY;
+	if (status & 2) /* PaperOut */
+		ret |= PARPORT_STATUS_PAPEROUT;
+	if (status & 4) /* Selected */
+		ret |= PARPORT_STATUS_SELECT;
+	/* the rest is not connected or handled autonomously in hardware */
+
+	return ret;
+}
+
+static void amiga_write_status( struct parport *p, unsigned char status)
+{
+DPRINTK("write_status %02x\n",status);
+	ciab.pra |= (ciab.pra & 0xf8) | status_pc_to_amiga(status);
+}
+
+static unsigned char amiga_read_status(struct parport *p)
+{
+	unsigned char status;
+
+	status = status_amiga_to_pc(ciab.pra & 7);
+DPRINTK("read_status %02x\n", status);
+	return status;
+}
+
+static void amiga_change_mode( struct parport *p, int m)
+{
+	/* XXX: This port only has one mode, and I am
+	not sure about the corresponding PC-style mode*/
+}
+
+/* as this ports irq handling is already done, we use a generic funktion */
+static void amiga_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	parport_generic_irq(irq, (struct parport *) dev_id, regs);
+}
+
+
+static void amiga_init_state(struct parport_state *s)
+{
+	s->u.amiga.data = 0;
+	s->u.amiga.datadir = 255;
+	s->u.amiga.status = 0;
+	s->u.amiga.statusdir = 0;
+}
+
+static void amiga_save_state(struct parport *p, struct parport_state *s)
+{
+	s->u.amiga.data = ciaa.prb;
+	s->u.amiga.datadir = ciaa.ddrb;
+	s->u.amiga.status = ciab.pra & 7;
+	s->u.amiga.statusdir = ciab.ddra & 7;
+}
+
+static void amiga_restore_state(struct parport *p, struct parport_state *s)
+{
+	ciaa.prb = s->u.amiga.data;
+	ciaa.ddrb = s->u.amiga.datadir;
+	ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
+	ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
+}
+
+static void amiga_enable_irq(struct parport *p)
+{
+	enable_irq(IRQ_AMIGA_CIAA_FLG);
+}
+
+static void amiga_disable_irq(struct parport *p)
+{
+	disable_irq(IRQ_AMIGA_CIAA_FLG);
+}
+
+static void amiga_inc_use_count(void)
+{
+	MOD_INC_USE_COUNT;
+}
+
+static void amiga_dec_use_count(void)
+{
+	MOD_DEC_USE_COUNT;
+}
+
+static struct parport_operations pp_amiga_ops = {
+	amiga_write_data,
+	amiga_read_data,
+
+	amiga_write_control,
+	amiga_read_control,
+	amiga_frob_control,
+
+	amiga_read_status,
+
+	amiga_enable_irq,
+	amiga_disable_irq,
+
+	NULL, /* data_forward */
+	NULL, /* data_reverse */
+
+	amiga_interrupt, 
+
+	amiga_init_state,
+	amiga_save_state,
+	amiga_restore_state,
+
+	amiga_inc_use_count,
+	amiga_dec_use_count,
+
+	parport_ieee1284_epp_write_data,
+	parport_ieee1284_epp_read_data, /* impossible? */
+	parport_ieee1284_epp_write_addr,
+	parport_ieee1284_epp_read_addr, /* impossible? */
+
+	parport_ieee1284_ecp_write_data,
+	parport_ieee1284_ecp_read_data, /* impossible? */
+	parport_ieee1284_ecp_write_addr,
+
+	parport_ieee1284_write_compat, /* FIXME - need to write amiga one */
+	parport_ieee1284_read_nibble,
+	parport_ieee1284_read_byte, /* impossible? */
+};
+
+/* ----------- Initialisation code --------------------------------- */
+
+__initfunc(int parport_amiga_init(void))
+{
+	struct parport *p;
+
+	if (MACH_IS_AMIGA && AMIGAHW_PRESENT(AMI_PARALLEL)) {
+		ciaa.ddrb = 0xff;
+		ciab.ddra &= 0xf8;
+		if (!(p = parport_register_port((unsigned long)&ciaa.prb,
+					IRQ_AMIGA_CIAA_FLG, PARPORT_DMA_NONE,
+					&pp_amiga_ops)))
+			return 0;
+		this_port = p;
+		printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
+		/* XXX: set operating mode */
+		parport_proc_register(p);
+		if (request_irq(IRQ_AMIGA_CIAA_FLG, amiga_interrupt, 0,
+				p->name, p)) {
+			parport_unregister_port (p);
+			return 0;
+		}
+
+		if (parport_probe_hook)
+			(*parport_probe_hook)(p);
+
+		parport_announce_port (p);
+
+		return 1;
+
+	}
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Joerg Dorchain");
+MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
+MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
+
+int init_module(void)
+{
+	return ! parport_amiga_init();
+}
+
+void cleanup_module(void)
+{
+	if (p->irq != PARPORT_IRQ_NONE)
+		free_irq(IRQ_AMIGA_CIAA_FLG, p);
+	parport_proc_unregister(this_port);
+	parport_unregister_port(this_port);
+}
+#endif
+
+