diff options
Diffstat (limited to 'drivers/parport/parport_atari.c')
| -rw-r--r-- | drivers/parport/parport_atari.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/parport/parport_atari.c b/drivers/parport/parport_atari.c new file mode 100644 index 0000000..78c3f34 --- /dev/null +++ b/drivers/parport/parport_atari.c @@ -0,0 +1,240 @@ +/* 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 ((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 irqreturn_t +parport_atari_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + parport_generic_irq(irq, (struct parport *) dev_id, regs); + return IRQ_HANDLED; +} + +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) +{ +#if 0 /* too dangerous, can kill sound chip */ + unsigned long flags; + + local_irq_save(flags); + /* Soundchip port B as input. */ + sound_ym.rd_data_reg_sel = 7; + sound_ym.wd_data = sound_ym.rd_data_reg_sel & ~0x40; + local_irq_restore(flags); +#endif +} + +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. */ + mfp.data_dir &= ~1; + /* MFP port I0 interrupt on high->low edge. */ + 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_atari_interrupt, + IRQ_TYPE_SLOW, 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) |
