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Diffstat (limited to '')
| -rw-r--r-- | arch/m68k/atari/ataints.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c new file mode 100644 index 000000000..56f02ea2c --- /dev/null +++ b/arch/m68k/atari/ataints.c @@ -0,0 +1,391 @@ +/* + * arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code + * + * 5/2/94 Roman Hodek: + * Added support for TT interrupts; setup for TT SCU (may someone has + * twiddled there and we won't get the right interrupts :-() + * + * Major change: The device-independent code in m68k/ints.c didn't know + * about non-autovec ints yet. It hardcoded the number of possible ints to + * 7 (IRQ1...IRQ7). But the Atari has lots of non-autovec ints! I made the + * number of possible ints a constant defined in interrupt.h, which is + * 47 for the Atari. So we can call request_irq() for all Atari interrupts + * just the normal way. Additionally, all vectors >= 48 are initialized to + * call trap() instead of inthandler(). This must be changed here, too. + * + * 1995-07-16 Lars Brinkhoff <f93labr@dd.chalmers.se>: + * Corrected a bug in atari_add_isr() which rejected all SCC + * interrupt sources if there were no TT MFP! + * + * 12/13/95: New interface functions atari_level_triggered_int() and + * atari_register_vme_int() as support for level triggered VME interrupts. + * + * 02/12/96: (Roman) + * Total rewrite of Atari interrupt handling, for new scheme see comments + * below. + * + * 1996-09-03 lars brinkhoff <f93labr@dd.chalmers.se>: + * Added new function atari_unregister_vme_int(), and + * modified atari_register_vme_int() as well as IS_VALID_INTNO() + * to work with it. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + * + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/kernel_stat.h> +#include <linux/init.h> +#include <linux/seq_file.h> +#include <linux/module.h> +#include <linux/irq.h> + +#include <asm/traps.h> + +#include <asm/atarihw.h> +#include <asm/atariints.h> +#include <asm/atari_stdma.h> +#include <asm/irq.h> +#include <asm/entry.h> +#include <asm/io.h> + + +/* + * Atari interrupt handling scheme: + * -------------------------------- + * + * All interrupt source have an internal number (defined in + * <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP, + * TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can + * be allocated by atari_register_vme_int(). + */ + +/* + * Bitmap for free interrupt vector numbers + * (new vectors starting from 0x70 can be allocated by + * atari_register_vme_int()) + */ +static int free_vme_vec_bitmap; + +/* GK: + * HBL IRQ handler for Falcon. Nobody needs it :-) + * ++andreas: raise ipl to disable further HBLANK interrupts. + */ +asmlinkage void falcon_hblhandler(void); +asm(".text\n" +__ALIGN_STR "\n\t" +"falcon_hblhandler:\n\t" + "orw #0x200,%sp@\n\t" /* set saved ipl to 2 */ + "rte"); + +extern void atari_microwire_cmd(int cmd); + +static unsigned int atari_irq_startup(struct irq_data *data) +{ + unsigned int irq = data->irq; + + m68k_irq_startup(data); + atari_turnon_irq(irq); + atari_enable_irq(irq); + return 0; +} + +static void atari_irq_shutdown(struct irq_data *data) +{ + unsigned int irq = data->irq; + + atari_disable_irq(irq); + atari_turnoff_irq(irq); + m68k_irq_shutdown(data); + + if (irq == IRQ_AUTO_4) + vectors[VEC_INT4] = falcon_hblhandler; +} + +static void atari_irq_enable(struct irq_data *data) +{ + atari_enable_irq(data->irq); +} + +static void atari_irq_disable(struct irq_data *data) +{ + atari_disable_irq(data->irq); +} + +static struct irq_chip atari_irq_chip = { + .name = "atari", + .irq_startup = atari_irq_startup, + .irq_shutdown = atari_irq_shutdown, + .irq_enable = atari_irq_enable, + .irq_disable = atari_irq_disable, +}; + +/* + * ST-MFP timer D chained interrupts - each driver gets its own timer + * interrupt instance. + */ + +struct mfptimerbase { + volatile struct MFP *mfp; + unsigned char mfp_mask, mfp_data; + unsigned short int_mask; + int handler_irq, mfptimer_irq, server_irq; + char *name; +} stmfp_base = { + .mfp = &st_mfp, + .int_mask = 0x0, + .handler_irq = IRQ_MFP_TIMD, + .mfptimer_irq = IRQ_MFP_TIMER1, + .name = "MFP Timer D" +}; + +static irqreturn_t mfp_timer_d_handler(int irq, void *dev_id) +{ + struct mfptimerbase *base = dev_id; + int mach_irq; + unsigned char ints; + + mach_irq = base->mfptimer_irq; + ints = base->int_mask; + for (; ints; mach_irq++, ints >>= 1) { + if (ints & 1) + generic_handle_irq(mach_irq); + } + return IRQ_HANDLED; +} + + +static void atari_mfptimer_enable(struct irq_data *data) +{ + int mfp_num = data->irq - IRQ_MFP_TIMER1; + stmfp_base.int_mask |= 1 << mfp_num; + atari_enable_irq(IRQ_MFP_TIMD); +} + +static void atari_mfptimer_disable(struct irq_data *data) +{ + int mfp_num = data->irq - IRQ_MFP_TIMER1; + stmfp_base.int_mask &= ~(1 << mfp_num); + if (!stmfp_base.int_mask) + atari_disable_irq(IRQ_MFP_TIMD); +} + +static struct irq_chip atari_mfptimer_chip = { + .name = "timer_d", + .irq_enable = atari_mfptimer_enable, + .irq_disable = atari_mfptimer_disable, +}; + + +/* + * EtherNAT CPLD interrupt handling + * CPLD interrupt register is at phys. 0x80000023 + * Need this mapped in at interrupt startup time + * Possibly need this mapped on demand anyway - + * EtherNAT USB driver needs to disable IRQ before + * startup! + */ + +static unsigned char *enat_cpld; + +static unsigned int atari_ethernat_startup(struct irq_data *data) +{ + int enat_num = 140 - data->irq + 1; + + m68k_irq_startup(data); + /* + * map CPLD interrupt register + */ + if (!enat_cpld) + enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2); + /* + * do _not_ enable the USB chip interrupt here - causes interrupt storm + * and triggers dead interrupt watchdog + * Need to reset the USB chip to a sane state in early startup before + * removing this hack + */ + if (enat_num == 1) + *enat_cpld |= 1 << enat_num; + + return 0; +} + +static void atari_ethernat_enable(struct irq_data *data) +{ + int enat_num = 140 - data->irq + 1; + /* + * map CPLD interrupt register + */ + if (!enat_cpld) + enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2); + *enat_cpld |= 1 << enat_num; +} + +static void atari_ethernat_disable(struct irq_data *data) +{ + int enat_num = 140 - data->irq + 1; + /* + * map CPLD interrupt register + */ + if (!enat_cpld) + enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2); + *enat_cpld &= ~(1 << enat_num); +} + +static void atari_ethernat_shutdown(struct irq_data *data) +{ + int enat_num = 140 - data->irq + 1; + if (enat_cpld) { + *enat_cpld &= ~(1 << enat_num); + iounmap(enat_cpld); + enat_cpld = NULL; + } +} + +static struct irq_chip atari_ethernat_chip = { + .name = "ethernat", + .irq_startup = atari_ethernat_startup, + .irq_shutdown = atari_ethernat_shutdown, + .irq_enable = atari_ethernat_enable, + .irq_disable = atari_ethernat_disable, +}; + +/* + * void atari_init_IRQ (void) + * + * Parameters: None + * + * Returns: Nothing + * + * This function should be called during kernel startup to initialize + * the atari IRQ handling routines. + */ + +void __init atari_init_IRQ(void) +{ + m68k_setup_user_interrupt(VEC_USER, NUM_ATARI_SOURCES - IRQ_USER); + m68k_setup_irq_controller(&atari_irq_chip, handle_simple_irq, 1, + NUM_ATARI_SOURCES - 1); + + /* Initialize the MFP(s) */ + +#ifdef ATARI_USE_SOFTWARE_EOI + st_mfp.vec_adr = 0x48; /* Software EOI-Mode */ +#else + st_mfp.vec_adr = 0x40; /* Automatic EOI-Mode */ +#endif + st_mfp.int_en_a = 0x00; /* turn off MFP-Ints */ + st_mfp.int_en_b = 0x00; + st_mfp.int_mk_a = 0xff; /* no Masking */ + st_mfp.int_mk_b = 0xff; + + if (ATARIHW_PRESENT(TT_MFP)) { +#ifdef ATARI_USE_SOFTWARE_EOI + tt_mfp.vec_adr = 0x58; /* Software EOI-Mode */ +#else + tt_mfp.vec_adr = 0x50; /* Automatic EOI-Mode */ +#endif + tt_mfp.int_en_a = 0x00; /* turn off MFP-Ints */ + tt_mfp.int_en_b = 0x00; + tt_mfp.int_mk_a = 0xff; /* no Masking */ + tt_mfp.int_mk_b = 0xff; + } + + if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) { + atari_scc.cha_a_ctrl = 9; + MFPDELAY(); + atari_scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */ + } + + if (ATARIHW_PRESENT(SCU)) { + /* init the SCU if present */ + tt_scu.sys_mask = 0x10; /* enable VBL (for the cursor) and + * disable HSYNC interrupts (who + * needs them?) MFP and SCC are + * enabled in VME mask + */ + tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */ + } else { + /* If no SCU and no Hades, the HSYNC interrupt needs to be + * disabled this way. (Else _inthandler in kernel/sys_call.S + * gets overruns) + */ + + vectors[VEC_INT2] = falcon_hblhandler; + vectors[VEC_INT4] = falcon_hblhandler; + } + + if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) { + /* Initialize the LM1992 Sound Controller to enable + the PSG sound. This is misplaced here, it should + be in an atasound_init(), that doesn't exist yet. */ + atari_microwire_cmd(MW_LM1992_PSG_HIGH); + } + + stdma_init(); + + /* Initialize the PSG: all sounds off, both ports output */ + sound_ym.rd_data_reg_sel = 7; + sound_ym.wd_data = 0xff; + + m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq, + IRQ_MFP_TIMER1, 8); + + irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED); + irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED); + + /* prepare timer D data for use as poll interrupt */ + /* set Timer D data Register - needs to be > 0 */ + st_mfp.tim_dt_d = 254; /* < 100 Hz */ + /* start timer D, div = 1:100 */ + st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6; + + /* request timer D dispatch handler */ + if (request_irq(IRQ_MFP_TIMD, mfp_timer_d_handler, IRQF_SHARED, + stmfp_base.name, &stmfp_base)) + pr_err("Couldn't register %s interrupt\n", stmfp_base.name); + + /* + * EtherNAT ethernet / USB interrupt handlers + */ + + m68k_setup_irq_controller(&atari_ethernat_chip, handle_simple_irq, + 139, 2); +} + + +/* + * atari_register_vme_int() returns the number of a free interrupt vector for + * hardware with a programmable int vector (probably a VME board). + */ + +unsigned int atari_register_vme_int(void) +{ + int i; + + for (i = 0; i < 32; i++) + if ((free_vme_vec_bitmap & (1 << i)) == 0) + break; + + if (i == 16) + return 0; + + free_vme_vec_bitmap |= 1 << i; + return VME_SOURCE_BASE + i; +} +EXPORT_SYMBOL(atari_register_vme_int); + + +void atari_unregister_vme_int(unsigned int irq) +{ + if (irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) { + irq -= VME_SOURCE_BASE; + free_vme_vec_bitmap &= ~(1 << irq); + } +} +EXPORT_SYMBOL(atari_unregister_vme_int); + + |