diff options
Diffstat (limited to 'drivers/parport/parport_mfc3.c')
| -rw-r--r-- | drivers/parport/parport_mfc3.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/drivers/parport/parport_mfc3.c b/drivers/parport/parport_mfc3.c new file mode 100644 index 000000000..d6bbe8446 --- /dev/null +++ b/drivers/parport/parport_mfc3.c @@ -0,0 +1,366 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Low-level parallel port routines for the Multiface 3 card + * + * Author: Joerg Dorchain <joerg@dorchain.net> + * + * (C) The elitist m68k Users(TM) + * + * based on the existing parport_amiga and lp_mfc + * + * + * From the MFC3 documentation: + * + * Miscellaneous PIA Details + * ------------------------- + * + * The two open-drain interrupt outputs /IRQA and /IRQB are routed to + * /INT2 of the Z2 bus. + * + * The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2 + * bus. This means that any PIA registers are accessed at even addresses. + * + * Centronics Pin Connections for the PIA + * -------------------------------------- + * + * The following table shows the connections between the PIA and the + * Centronics interface connector. These connections implement a single, but + * very complete, Centronics type interface. The Pin column gives the pin + * numbers of the PIA. The Centronics pin numbers can be found in the section + * "Parallel Connectors". + * + * + * Pin | PIA | Dir | Centronics Names + * -------+-----+-----+--------------------------------------------------------- + * 19 | CB2 | --> | /STROBE (aka /DRDY) + * 10-17 | PBx | <-> | DATA0 - DATA7 + * 18 | CB1 | <-- | /ACK + * 40 | CA1 | <-- | BUSY + * 3 | PA1 | <-- | PAPER-OUT (aka POUT) + * 4 | PA2 | <-- | SELECTED (aka SEL) + * 9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME) + * 6 | PA4 | <-- | /ERROR (aka /FAULT) + * 7 | PA5 | --> | DIR (aka /SELECT-IN) + * 8 | PA6 | --> | /AUTO-FEED-XT + * 39 | CA2 | --> | open + * 5 | PA3 | <-- | /ACK (same as CB1!) + * 2 | PA0 | <-- | BUSY (same as CA1!) + * -------+-----+-----+--------------------------------------------------------- + * + * Should be enough to understand some of the driver. + * + * Per convention for normal use the port registers are visible. + * If you need the data direction registers, restore the value in the + * control register. + */ + +#include "multiface.h" +#include <linux/module.h> +#include <linux/init.h> +#include <linux/parport.h> +#include <linux/delay.h> +#include <linux/mc6821.h> +#include <linux/zorro.h> +#include <linux/interrupt.h> +#include <asm/setup.h> +#include <asm/amigahw.h> +#include <asm/irq.h> +#include <asm/amigaints.h> + +/* Maximum Number of Cards supported */ +#define MAX_MFC 5 + +#undef DEBUG + +static struct parport *this_port[MAX_MFC] = {NULL, }; +static volatile int dummy; /* for trigger readds */ + +#define pia(dev) ((struct pia *)(dev->base)) +static struct parport_operations pp_mfc3_ops; + +static void mfc3_write_data(struct parport *p, unsigned char data) +{ + pr_debug("write_data %c\n", data); + + dummy = pia(p)->pprb; /* clears irq bit */ + /* Triggers also /STROBE.*/ + pia(p)->pprb = data; +} + +static unsigned char mfc3_read_data(struct parport *p) +{ + /* clears interrupt bit. Triggers also /STROBE. */ + return pia(p)->pprb; +} + +static unsigned char control_pc_to_mfc3(unsigned char control) +{ + unsigned char ret = 32|64; + + if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */ + ret &= ~32; /* /SELECT_IN */ + if (control & PARPORT_CONTROL_INIT) /* INITP */ + ret |= 128; + if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */ + ret &= ~64; + if (control & PARPORT_CONTROL_STROBE) /* Strobe */ + /* Handled directly by hardware */; + return ret; +} + +static unsigned char control_mfc3_to_pc(unsigned char control) +{ + unsigned char ret = PARPORT_CONTROL_STROBE + | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT; + + if (control & 128) /* /INITP */ + ret |= PARPORT_CONTROL_INIT; + if (control & 64) /* /AUTOLF */ + ret &= ~PARPORT_CONTROL_AUTOFD; + if (control & 32) /* /SELECT_IN */ + ret &= ~PARPORT_CONTROL_SELECT; + return ret; +} + +static void mfc3_write_control(struct parport *p, unsigned char control) +{ + pr_debug("write_control %02x\n", control); + pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control); +} + +static unsigned char mfc3_read_control( struct parport *p) +{ + pr_debug("read_control\n"); + return control_mfc3_to_pc(pia(p)->ppra & 0xe0); +} + +static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val) +{ + unsigned char old; + + pr_debug("frob_control mask %02x, value %02x\n", mask, val); + old = mfc3_read_control(p); + mfc3_write_control(p, (old & ~mask) ^ val); + return old; +} + +static unsigned char status_mfc3_to_pc(unsigned char status) +{ + unsigned char ret = PARPORT_STATUS_BUSY; + + if (status & 1) /* Busy */ + ret &= ~PARPORT_STATUS_BUSY; + if (status & 2) /* PaperOut */ + ret |= PARPORT_STATUS_PAPEROUT; + if (status & 4) /* Selected */ + ret |= PARPORT_STATUS_SELECT; + if (status & 8) /* Ack */ + ret |= PARPORT_STATUS_ACK; + if (status & 16) /* /ERROR */ + ret |= PARPORT_STATUS_ERROR; + + return ret; +} + +static unsigned char mfc3_read_status(struct parport *p) +{ + unsigned char status; + + status = status_mfc3_to_pc(pia(p)->ppra & 0x1f); + pr_debug("read_status %02x\n", status); + return status; +} + +static int use_cnt; + +static irqreturn_t mfc3_interrupt(int irq, void *dev_id) +{ + int i; + + for( i = 0; i < MAX_MFC; i++) + if (this_port[i] != NULL) + if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */ + dummy = pia(this_port[i])->pprb; /* clear irq bit */ + parport_generic_irq(this_port[i]); + } + return IRQ_HANDLED; +} + +static void mfc3_enable_irq(struct parport *p) +{ + pia(p)->crb |= PIA_C1_ENABLE_IRQ; +} + +static void mfc3_disable_irq(struct parport *p) +{ + pia(p)->crb &= ~PIA_C1_ENABLE_IRQ; +} + +static void mfc3_data_forward(struct parport *p) +{ + pr_debug("forward\n"); + pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ + pia(p)->pddrb = 255; /* all pins output */ + pia(p)->crb |= PIA_DDR; /* make data register visible - default */ +} + +static void mfc3_data_reverse(struct parport *p) +{ + pr_debug("reverse\n"); + pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ + pia(p)->pddrb = 0; /* all pins input */ + pia(p)->crb |= PIA_DDR; /* make data register visible - default */ +} + +static void mfc3_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 = 0xe0; +} + +static void mfc3_save_state(struct parport *p, struct parport_state *s) +{ + s->u.amiga.data = pia(p)->pprb; + pia(p)->crb &= ~PIA_DDR; + s->u.amiga.datadir = pia(p)->pddrb; + pia(p)->crb |= PIA_DDR; + s->u.amiga.status = pia(p)->ppra; + pia(p)->cra &= ~PIA_DDR; + s->u.amiga.statusdir = pia(p)->pddrb; + pia(p)->cra |= PIA_DDR; +} + +static void mfc3_restore_state(struct parport *p, struct parport_state *s) +{ + pia(p)->pprb = s->u.amiga.data; + pia(p)->crb &= ~PIA_DDR; + pia(p)->pddrb = s->u.amiga.datadir; + pia(p)->crb |= PIA_DDR; + pia(p)->ppra = s->u.amiga.status; + pia(p)->cra &= ~PIA_DDR; + pia(p)->pddrb = s->u.amiga.statusdir; + pia(p)->cra |= PIA_DDR; +} + +static struct parport_operations pp_mfc3_ops = { + .write_data = mfc3_write_data, + .read_data = mfc3_read_data, + + .write_control = mfc3_write_control, + .read_control = mfc3_read_control, + .frob_control = mfc3_frob_control, + + .read_status = mfc3_read_status, + + .enable_irq = mfc3_enable_irq, + .disable_irq = mfc3_disable_irq, + + .data_forward = mfc3_data_forward, + .data_reverse = mfc3_data_reverse, + + .init_state = mfc3_init_state, + .save_state = mfc3_save_state, + .restore_state = mfc3_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_mfc3_init(void) +{ + struct parport *p; + int pias = 0; + struct pia *pp; + struct zorro_dev *z = NULL; + + if (!MACH_IS_AMIGA) + return -ENODEV; + + while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) { + unsigned long piabase = z->resource.start+PIABASE; + if (!request_mem_region(piabase, sizeof(struct pia), "PIA")) + continue; + + pp = ZTWO_VADDR(piabase); + pp->crb = 0; + pp->pddrb = 255; /* all data pins output */ + pp->crb = PIA_DDR|32|8; + dummy = pp->pddrb; /* reading clears interrupt */ + pp->cra = 0; + pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */ + pp->cra = PIA_DDR; + pp->ppra = 0; /* reset printer */ + udelay(10); + pp->ppra = 128; + p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS, + PARPORT_DMA_NONE, &pp_mfc3_ops); + if (!p) + goto out_port; + + if (p->irq != PARPORT_IRQ_NONE) { + if (use_cnt++ == 0) + if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops)) + goto out_irq; + } + p->dev = &z->dev; + + this_port[pias++] = p; + pr_info("%s: Multiface III port using irq\n", p->name); + /* XXX: set operating mode */ + + p->private_data = (void *)piabase; + parport_announce_port (p); + + if (pias >= MAX_MFC) + break; + continue; + + out_irq: + parport_put_port(p); + out_port: + release_mem_region(piabase, sizeof(struct pia)); + } + + return pias ? 0 : -ENODEV; +} + +static void __exit parport_mfc3_exit(void) +{ + int i; + + for (i = 0; i < MAX_MFC; i++) { + if (!this_port[i]) + continue; + parport_remove_port(this_port[i]); + if (this_port[i]->irq != PARPORT_IRQ_NONE) { + if (--use_cnt == 0) + free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops); + } + release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia)); + parport_put_port(this_port[i]); + } +} + + +MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); +MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port"); +MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port"); +MODULE_LICENSE("GPL"); + +module_init(parport_mfc3_init) +module_exit(parport_mfc3_exit) |