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Diffstat (limited to 'arch/m68k/amiga/amiints.c')
| -rw-r--r-- | arch/m68k/amiga/amiints.c | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/arch/m68k/amiga/amiints.c b/arch/m68k/amiga/amiints.c new file mode 100644 index 00000000000..d9edf2d1a49 --- /dev/null +++ b/arch/m68k/amiga/amiints.c @@ -0,0 +1,520 @@ +/* + * linux/arch/m68k/amiga/amiints.c -- Amiga Linux interrupt handling code + * + * 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. + * + * 11/07/96: rewritten interrupt handling, irq lists are exists now only for + * this sources where it makes sense (VERTB/PORTS/EXTER) and you must + * be careful that dev_id for this sources is unique since this the + * only possibility to distinguish between different handlers for + * free_irq. irq lists also have different irq flags: + * - IRQ_FLG_FAST: handler is inserted at top of list (after other + * fast handlers) + * - IRQ_FLG_SLOW: handler is inserted at bottom of list and before + * they're executed irq level is set to the previous + * one, but handlers don't need to be reentrant, if + * reentrance occurred, slow handlers will be just + * called again. + * The whole interrupt handling for CIAs is moved to cia.c + * /Roman Zippel + * + * 07/08/99: rewamp of the interrupt handling - we now have two types of + * interrupts, normal and fast handlers, fast handlers being + * marked with SA_INTERRUPT and runs with all other interrupts + * disabled. Normal interrupts disable their own source but + * run with all other interrupt sources enabled. + * PORTS and EXTER interrupts are always shared even if the + * drivers do not explicitly mark this when calling + * request_irq which they really should do. + * This is similar to the way interrupts are handled on all + * other architectures and makes a ton of sense besides + * having the advantage of making it easier to share + * drivers. + * /Jes + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/kernel_stat.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/seq_file.h> + +#include <asm/system.h> +#include <asm/irq.h> +#include <asm/traps.h> +#include <asm/amigahw.h> +#include <asm/amigaints.h> +#include <asm/amipcmcia.h> + +extern int cia_request_irq(struct ciabase *base,int irq, + irqreturn_t (*handler)(int, void *, struct pt_regs *), + unsigned long flags, const char *devname, void *dev_id); +extern void cia_free_irq(struct ciabase *base, unsigned int irq, void *dev_id); +extern void cia_init_IRQ(struct ciabase *base); +extern int cia_get_irq_list(struct ciabase *base, struct seq_file *p); + +/* irq node variables for amiga interrupt sources */ +static irq_node_t *ami_irq_list[AMI_STD_IRQS]; + +static unsigned short amiga_intena_vals[AMI_STD_IRQS] = { + [IRQ_AMIGA_VERTB] = IF_VERTB, + [IRQ_AMIGA_COPPER] = IF_COPER, + [IRQ_AMIGA_AUD0] = IF_AUD0, + [IRQ_AMIGA_AUD1] = IF_AUD1, + [IRQ_AMIGA_AUD2] = IF_AUD2, + [IRQ_AMIGA_AUD3] = IF_AUD3, + [IRQ_AMIGA_BLIT] = IF_BLIT, + [IRQ_AMIGA_DSKSYN] = IF_DSKSYN, + [IRQ_AMIGA_DSKBLK] = IF_DSKBLK, + [IRQ_AMIGA_RBF] = IF_RBF, + [IRQ_AMIGA_TBE] = IF_TBE, + [IRQ_AMIGA_SOFT] = IF_SOFT, + [IRQ_AMIGA_PORTS] = IF_PORTS, + [IRQ_AMIGA_EXTER] = IF_EXTER +}; +static const unsigned char ami_servers[AMI_STD_IRQS] = { + [IRQ_AMIGA_VERTB] = 1, + [IRQ_AMIGA_PORTS] = 1, + [IRQ_AMIGA_EXTER] = 1 +}; + +static short ami_ablecount[AMI_IRQS]; + +static irqreturn_t ami_badint(int irq, void *dev_id, struct pt_regs *fp) +{ + num_spurious += 1; + return IRQ_NONE; +} + +/* + * void amiga_init_IRQ(void) + * + * Parameters: None + * + * Returns: Nothing + * + * This function should be called during kernel startup to initialize + * the amiga IRQ handling routines. + */ + +void __init amiga_init_IRQ(void) +{ + int i; + + /* initialize handlers */ + for (i = 0; i < AMI_STD_IRQS; i++) { + if (ami_servers[i]) { + ami_irq_list[i] = NULL; + } else { + ami_irq_list[i] = new_irq_node(); + ami_irq_list[i]->handler = ami_badint; + ami_irq_list[i]->flags = 0; + ami_irq_list[i]->dev_id = NULL; + ami_irq_list[i]->devname = NULL; + ami_irq_list[i]->next = NULL; + } + } + for (i = 0; i < AMI_IRQS; i++) + ami_ablecount[i] = 0; + + /* turn off PCMCIA interrupts */ + if (AMIGAHW_PRESENT(PCMCIA)) + gayle.inten = GAYLE_IRQ_IDE; + + /* turn off all interrupts and enable the master interrupt bit */ + custom.intena = 0x7fff; + custom.intreq = 0x7fff; + custom.intena = IF_SETCLR | IF_INTEN; + + cia_init_IRQ(&ciaa_base); + cia_init_IRQ(&ciab_base); +} + +static inline int amiga_insert_irq(irq_node_t **list, irq_node_t *node) +{ + unsigned long flags; + irq_node_t *cur; + + if (!node->dev_id) + printk("%s: Warning: dev_id of %s is zero\n", + __FUNCTION__, node->devname); + + local_irq_save(flags); + + cur = *list; + + if (node->flags & SA_INTERRUPT) { + if (node->flags & SA_SHIRQ) + return -EBUSY; + /* + * There should never be more than one + */ + while (cur && cur->flags & SA_INTERRUPT) { + list = &cur->next; + cur = cur->next; + } + } else { + while (cur) { + list = &cur->next; + cur = cur->next; + } + } + + node->next = cur; + *list = node; + + local_irq_restore(flags); + return 0; +} + +static inline void amiga_delete_irq(irq_node_t **list, void *dev_id) +{ + unsigned long flags; + irq_node_t *node; + + local_irq_save(flags); + + for (node = *list; node; list = &node->next, node = *list) { + if (node->dev_id == dev_id) { + *list = node->next; + /* Mark it as free. */ + node->handler = NULL; + local_irq_restore(flags); + return; + } + } + local_irq_restore(flags); + printk ("%s: tried to remove invalid irq\n", __FUNCTION__); +} + +/* + * amiga_request_irq : add an interrupt service routine for a particular + * machine specific interrupt source. + * If the addition was successful, it returns 0. + */ + +int amiga_request_irq(unsigned int irq, + irqreturn_t (*handler)(int, void *, struct pt_regs *), + unsigned long flags, const char *devname, void *dev_id) +{ + irq_node_t *node; + int error = 0; + + if (irq >= AMI_IRQS) { + printk ("%s: Unknown IRQ %d from %s\n", __FUNCTION__, + irq, devname); + return -ENXIO; + } + + if (irq >= IRQ_AMIGA_AUTO) + return cpu_request_irq(irq - IRQ_AMIGA_AUTO, handler, + flags, devname, dev_id); + + if (irq >= IRQ_AMIGA_CIAB) + return cia_request_irq(&ciab_base, irq - IRQ_AMIGA_CIAB, + handler, flags, devname, dev_id); + + if (irq >= IRQ_AMIGA_CIAA) + return cia_request_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA, + handler, flags, devname, dev_id); + + /* + * IRQ_AMIGA_PORTS & IRQ_AMIGA_EXTER defaults to shared, + * we could add a check here for the SA_SHIRQ flag but all drivers + * should be aware of sharing anyway. + */ + if (ami_servers[irq]) { + if (!(node = new_irq_node())) + return -ENOMEM; + node->handler = handler; + node->flags = flags; + node->dev_id = dev_id; + node->devname = devname; + node->next = NULL; + error = amiga_insert_irq(&ami_irq_list[irq], node); + } else { + ami_irq_list[irq]->handler = handler; + ami_irq_list[irq]->flags = flags; + ami_irq_list[irq]->dev_id = dev_id; + ami_irq_list[irq]->devname = devname; + } + + /* enable the interrupt */ + if (irq < IRQ_AMIGA_PORTS && !ami_ablecount[irq]) + custom.intena = IF_SETCLR | amiga_intena_vals[irq]; + + return error; +} + +void amiga_free_irq(unsigned int irq, void *dev_id) +{ + if (irq >= AMI_IRQS) { + printk ("%s: Unknown IRQ %d\n", __FUNCTION__, irq); + return; + } + + if (irq >= IRQ_AMIGA_AUTO) + cpu_free_irq(irq - IRQ_AMIGA_AUTO, dev_id); + + if (irq >= IRQ_AMIGA_CIAB) { + cia_free_irq(&ciab_base, irq - IRQ_AMIGA_CIAB, dev_id); + return; + } + + if (irq >= IRQ_AMIGA_CIAA) { + cia_free_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA, dev_id); + return; + } + + if (ami_servers[irq]) { + amiga_delete_irq(&ami_irq_list[irq], dev_id); + /* if server list empty, disable the interrupt */ + if (!ami_irq_list[irq] && irq < IRQ_AMIGA_PORTS) + custom.intena = amiga_intena_vals[irq]; + } else { + if (ami_irq_list[irq]->dev_id != dev_id) + printk("%s: removing probably wrong IRQ %d from %s\n", + __FUNCTION__, irq, ami_irq_list[irq]->devname); + ami_irq_list[irq]->handler = ami_badint; + ami_irq_list[irq]->flags = 0; + ami_irq_list[irq]->dev_id = NULL; + ami_irq_list[irq]->devname = NULL; + custom.intena = amiga_intena_vals[irq]; + } +} + +/* + * Enable/disable a particular machine specific interrupt source. + * Note that this may affect other interrupts in case of a shared interrupt. + * This function should only be called for a _very_ short time to change some + * internal data, that may not be changed by the interrupt at the same time. + * ami_(enable|disable)_irq calls may also be nested. + */ + +void amiga_enable_irq(unsigned int irq) +{ + if (irq >= AMI_IRQS) { + printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq); + return; + } + + if (--ami_ablecount[irq]) + return; + + /* No action for auto-vector interrupts */ + if (irq >= IRQ_AMIGA_AUTO){ + printk("%s: Trying to enable auto-vector IRQ %i\n", + __FUNCTION__, irq - IRQ_AMIGA_AUTO); + return; + } + + if (irq >= IRQ_AMIGA_CIAB) { + cia_set_irq(&ciab_base, (1 << (irq - IRQ_AMIGA_CIAB))); + cia_able_irq(&ciab_base, CIA_ICR_SETCLR | + (1 << (irq - IRQ_AMIGA_CIAB))); + return; + } + + if (irq >= IRQ_AMIGA_CIAA) { + cia_set_irq(&ciaa_base, (1 << (irq - IRQ_AMIGA_CIAA))); + cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | + (1 << (irq - IRQ_AMIGA_CIAA))); + return; + } + + /* enable the interrupt */ + custom.intena = IF_SETCLR | amiga_intena_vals[irq]; +} + +void amiga_disable_irq(unsigned int irq) +{ + if (irq >= AMI_IRQS) { + printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq); + return; + } + + if (ami_ablecount[irq]++) + return; + + /* No action for auto-vector interrupts */ + if (irq >= IRQ_AMIGA_AUTO) { + printk("%s: Trying to disable auto-vector IRQ %i\n", + __FUNCTION__, irq - IRQ_AMIGA_AUTO); + return; + } + + if (irq >= IRQ_AMIGA_CIAB) { + cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB)); + return; + } + + if (irq >= IRQ_AMIGA_CIAA) { + cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA)); + return; + } + + /* disable the interrupt */ + custom.intena = amiga_intena_vals[irq]; +} + +inline void amiga_do_irq(int irq, struct pt_regs *fp) +{ + kstat_cpu(0).irqs[SYS_IRQS + irq]++; + ami_irq_list[irq]->handler(irq, ami_irq_list[irq]->dev_id, fp); +} + +void amiga_do_irq_list(int irq, struct pt_regs *fp) +{ + irq_node_t *node; + + kstat_cpu(0).irqs[SYS_IRQS + irq]++; + + custom.intreq = amiga_intena_vals[irq]; + + for (node = ami_irq_list[irq]; node; node = node->next) + node->handler(irq, node->dev_id, fp); +} + +/* + * The builtin Amiga hardware interrupt handlers. + */ + +static irqreturn_t ami_int1(int irq, void *dev_id, struct pt_regs *fp) +{ + unsigned short ints = custom.intreqr & custom.intenar; + + /* if serial transmit buffer empty, interrupt */ + if (ints & IF_TBE) { + custom.intreq = IF_TBE; + amiga_do_irq(IRQ_AMIGA_TBE, fp); + } + + /* if floppy disk transfer complete, interrupt */ + if (ints & IF_DSKBLK) { + custom.intreq = IF_DSKBLK; + amiga_do_irq(IRQ_AMIGA_DSKBLK, fp); + } + + /* if software interrupt set, interrupt */ + if (ints & IF_SOFT) { + custom.intreq = IF_SOFT; + amiga_do_irq(IRQ_AMIGA_SOFT, fp); + } + return IRQ_HANDLED; +} + +static irqreturn_t ami_int3(int irq, void *dev_id, struct pt_regs *fp) +{ + unsigned short ints = custom.intreqr & custom.intenar; + + /* if a blitter interrupt */ + if (ints & IF_BLIT) { + custom.intreq = IF_BLIT; + amiga_do_irq(IRQ_AMIGA_BLIT, fp); + } + + /* if a copper interrupt */ + if (ints & IF_COPER) { + custom.intreq = IF_COPER; + amiga_do_irq(IRQ_AMIGA_COPPER, fp); + } + + /* if a vertical blank interrupt */ + if (ints & IF_VERTB) + amiga_do_irq_list(IRQ_AMIGA_VERTB, fp); + return IRQ_HANDLED; +} + +static irqreturn_t ami_int4(int irq, void *dev_id, struct pt_regs *fp) +{ + unsigned short ints = custom.intreqr & custom.intenar; + + /* if audio 0 interrupt */ + if (ints & IF_AUD0) { + custom.intreq = IF_AUD0; + amiga_do_irq(IRQ_AMIGA_AUD0, fp); + } + + /* if audio 1 interrupt */ + if (ints & IF_AUD1) { + custom.intreq = IF_AUD1; + amiga_do_irq(IRQ_AMIGA_AUD1, fp); + } + + /* if audio 2 interrupt */ + if (ints & IF_AUD2) { + custom.intreq = IF_AUD2; + amiga_do_irq(IRQ_AMIGA_AUD2, fp); + } + + /* if audio 3 interrupt */ + if (ints & IF_AUD3) { + custom.intreq = IF_AUD3; + amiga_do_irq(IRQ_AMIGA_AUD3, fp); + } + return IRQ_HANDLED; +} + +static irqreturn_t ami_int5(int irq, void *dev_id, struct pt_regs *fp) +{ + unsigned short ints = custom.intreqr & custom.intenar; + + /* if serial receive buffer full interrupt */ + if (ints & IF_RBF) { + /* acknowledge of IF_RBF must be done by the serial interrupt */ + amiga_do_irq(IRQ_AMIGA_RBF, fp); + } + + /* if a disk sync interrupt */ + if (ints & IF_DSKSYN) { + custom.intreq = IF_DSKSYN; + amiga_do_irq(IRQ_AMIGA_DSKSYN, fp); + } + return IRQ_HANDLED; +} + +static irqreturn_t ami_int7(int irq, void *dev_id, struct pt_regs *fp) +{ + panic ("level 7 interrupt received\n"); +} + +irqreturn_t (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = { + [0] = ami_badint, + [1] = ami_int1, + [2] = ami_badint, + [3] = ami_int3, + [4] = ami_int4, + [5] = ami_int5, + [6] = ami_badint, + [7] = ami_int7 +}; + +int show_amiga_interrupts(struct seq_file *p, void *v) +{ + int i; + irq_node_t *node; + + for (i = 0; i < AMI_STD_IRQS; i++) { + if (!(node = ami_irq_list[i])) + continue; + seq_printf(p, "ami %2d: %10u ", i, + kstat_cpu(0).irqs[SYS_IRQS + i]); + do { + if (node->flags & SA_INTERRUPT) + seq_puts(p, "F "); + else + seq_puts(p, " "); + seq_printf(p, "%s\n", node->devname); + if ((node = node->next)) + seq_puts(p, " "); + } while (node); + } + + cia_get_irq_list(&ciaa_base, p); + cia_get_irq_list(&ciab_base, p); + return 0; +} |