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- /*
- * 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 mfptimer_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, mfptimer_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);
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