diff options
Diffstat (limited to 'drivers/parport/parport_amiga.c')
| -rw-r--r-- | drivers/parport/parport_amiga.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/parport/parport_amiga.c b/drivers/parport/parport_amiga.c new file mode 100644 index 000000000000..5126e74ac2ec --- /dev/null +++ b/drivers/parport/parport_amiga.c @@ -0,0 +1,293 @@ +/* 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 <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 struct parport *this_port = NULL; + +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; +} + +#if 0 +static unsigned char control_pc_to_amiga(unsigned char control) +{ + unsigned char ret = 0; + + 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_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; +} + +#if 0 /* currently unused */ +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; +} +#endif + +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; +} + +/* as this ports irq handling is already done, we use a generic funktion */ +static irqreturn_t amiga_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + parport_generic_irq(irq, (struct parport *) dev_id, regs); + return IRQ_HANDLED; +} + +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 parport_amiga_init(void) +{ + struct parport *p; + int err; + + if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_PARALLEL)) + return -ENODEV; + + err = -EBUSY; + if (!request_mem_region(CIAA_PHYSADDR-1+0x100, 0x100, "parallel")) + goto out_mem; + + 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) + goto out_port; + + err = request_irq(IRQ_AMIGA_CIAA_FLG, amiga_interrupt, 0, p->name, p); + if (err) + goto out_irq; + + this_port = p; + printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name); + /* XXX: set operating mode */ + parport_announce_port(p); + + return 0; + +out_irq: + parport_put_port(p); +out_port: + release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100); +out_mem: + return err; +} + +static void __exit parport_amiga_exit(void) +{ + parport_remove_port(this_port); + if (this_port->irq != PARPORT_IRQ_NONE) + free_irq(IRQ_AMIGA_CIAA_FLG, this_port); + parport_put_port(this_port); + release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100); +} + + +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_init(parport_amiga_init) +module_exit(parport_amiga_exit) |