--- /dev/null
+/* Low-level parallel port routines for the Amiga built-in port
+ *
+ * Author: Joerg Dorchain <joerg@dorchain.net>
+ *
+ * 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 bidirectional 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 <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <asm/setup.h>
+#include <asm/amigahw.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/amigaints.h>
+
+#undef DEBUG
+#ifdef DEBUG
+#define DPRINTK printk
+#else
+#define DPRINTK(x...) do { } while (0)
+#endif
+
+
+static void amiga_write_data(struct parport *p, unsigned char data)
+{
+ DPRINTK(KERN_DEBUG "write_data %c\n",data);
+ /* Triggers also /STROBE. This behavior cannot be changed */
+ ciaa.prb = data;
+ mb();
+}
+
+static unsigned char amiga_read_data(struct parport *p)
+{
+ /* Triggers also /STROBE. This behavior cannot be changed */
+ return ciaa.prb;
+}
+
+static unsigned char control_amiga_to_pc(unsigned char control)
+{
+ return 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(KERN_DEBUG "write_control %02x\n",control);
+ /* No implementation possible */
+}
+
+static unsigned char amiga_read_control( struct parport *p)
+{
+ DPRINTK(KERN_DEBUG "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(KERN_DEBUG "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_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 unsigned char amiga_read_status(struct parport *p)
+{
+ unsigned char status;
+
+ status = status_amiga_to_pc(ciab.pra & 7);
+ DPRINTK(KERN_DEBUG "read_status %02x\n", status);
+ return status;
+}
+
+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_data_forward(struct parport *p)
+{
+ DPRINTK(KERN_DEBUG "forward\n");
+ ciaa.ddrb = 0xff; /* all pins output */
+ mb();
+}
+
+static void amiga_data_reverse(struct parport *p)
+{
+ DPRINTK(KERN_DEBUG "reverse\n");
+ ciaa.ddrb = 0; /* all pins input */
+ mb();
+}
+
+static void amiga_init_state(struct pardevice *dev, 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)
+{
+ mb();
+ 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;
+ mb();
+}
+
+static void amiga_restore_state(struct parport *p, struct parport_state *s)
+{
+ mb();
+ 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;
+ mb();
+}
+
+static struct parport_operations pp_amiga_ops = {
+ .write_data = amiga_write_data,
+ .read_data = amiga_read_data,
+
+ .write_control = amiga_write_control,
+ .read_control = amiga_read_control,
+ .frob_control = amiga_frob_control,
+
+ .read_status = amiga_read_status,
+
+ .enable_irq = amiga_enable_irq,
+ .disable_irq = amiga_disable_irq,
+
+ .data_forward = amiga_data_forward,
+ .data_reverse = amiga_data_reverse,
+
+ .init_state = amiga_init_state,
+ .save_state = amiga_save_state,
+ .restore_state = amiga_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,
+};
+
+/* ----------- Initialisation code --------------------------------- */
+
+static int __init amiga_parallel_probe(struct platform_device *pdev)
+{
+ struct parport *p;
+ int err;
+
+ ciaa.ddrb = 0xff;
+ ciab.ddra &= 0xf8;
+ mb();
+
+ p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
+ PARPORT_DMA_NONE, &pp_amiga_ops);
+ if (!p)
+ return -EBUSY;
+
+ err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
+ p);
+ if (err)
+ goto out_irq;
+
+ printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
+ /* XXX: set operating mode */
+ parport_announce_port(p);
+
+ platform_set_drvdata(pdev, p);
+
+ return 0;
+
+out_irq:
+ parport_put_port(p);
+ return err;
+}
+
+static int __exit amiga_parallel_remove(struct platform_device *pdev)
+{
+ struct parport *port = platform_get_drvdata(pdev);
+
+ parport_remove_port(port);
+ if (port->irq != PARPORT_IRQ_NONE)
+ free_irq(IRQ_AMIGA_CIAA_FLG, port);
+ parport_put_port(port);
+ return 0;
+}
+
+static struct platform_driver amiga_parallel_driver = {
+ .remove = __exit_p(amiga_parallel_remove),
+ .driver = {
+ .name = "amiga-parallel",
+ },
+};
+
+module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
+
+MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
+MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
+MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:amiga-parallel");
Code Review / kvmfornfv.git / blobdiff