diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/m68k/mac/oss.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/m68k/mac/oss.c | 228 |
1 files changed, 0 insertions, 228 deletions
diff --git a/ANDROID_3.4.5/arch/m68k/mac/oss.c b/ANDROID_3.4.5/arch/m68k/mac/oss.c deleted file mode 100644 index 6c4c882c..00000000 --- a/ANDROID_3.4.5/arch/m68k/mac/oss.c +++ /dev/null @@ -1,228 +0,0 @@ -/* - * Operating System Services (OSS) chip handling - * Written by Joshua M. Thompson (funaho@jurai.org) - * - * - * This chip is used in the IIfx in place of VIA #2. It acts like a fancy - * VIA chip with prorammable interrupt levels. - * - * 990502 (jmt) - Major rewrite for new interrupt architecture as well as some - * recent insights into OSS operational details. - * 990610 (jmt) - Now taking full advantage of the OSS. Interrupts are mapped - * to mostly match the A/UX interrupt scheme supported on the - * VIA side. Also added support for enabling the ISM irq again - * since we now have a functional IOP manager. - */ - -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/irq.h> - -#include <asm/bootinfo.h> -#include <asm/macintosh.h> -#include <asm/macints.h> -#include <asm/mac_via.h> -#include <asm/mac_oss.h> - -int oss_present; -volatile struct mac_oss *oss; - -/* - * Initialize the OSS - * - * The OSS "detection" code is actually in via_init() which is always called - * before us. Thus we can count on oss_present being valid on entry. - */ - -void __init oss_init(void) -{ - int i; - - if (!oss_present) return; - - oss = (struct mac_oss *) OSS_BASE; - - /* Disable all interrupts. Unlike a VIA it looks like we */ - /* do this by setting the source's interrupt level to zero. */ - - for (i = 0; i <= OSS_NUM_SOURCES; i++) { - oss->irq_level[i] = 0; - } -} - -/* - * Initialize OSS for Nubus access - */ - -void __init oss_nubus_init(void) -{ -} - -/* - * Handle miscellaneous OSS interrupts. - */ - -static void oss_irq(unsigned int irq, struct irq_desc *desc) -{ - int events = oss->irq_pending & - (OSS_IP_IOPSCC | OSS_IP_SCSI | OSS_IP_IOPISM); - -#ifdef DEBUG_IRQS - if ((console_loglevel == 10) && !(events & OSS_IP_SCSI)) { - printk("oss_irq: irq %u events = 0x%04X\n", irq, - (int) oss->irq_pending); - } -#endif - - if (events & OSS_IP_IOPSCC) { - oss->irq_pending &= ~OSS_IP_IOPSCC; - generic_handle_irq(IRQ_MAC_SCC); - } - - if (events & OSS_IP_SCSI) { - oss->irq_pending &= ~OSS_IP_SCSI; - generic_handle_irq(IRQ_MAC_SCSI); - } - - if (events & OSS_IP_IOPISM) { - oss->irq_pending &= ~OSS_IP_IOPISM; - generic_handle_irq(IRQ_MAC_ADB); - } -} - -/* - * Nubus IRQ handler, OSS style - * - * Unlike the VIA/RBV this is on its own autovector interrupt level. - */ - -static void oss_nubus_irq(unsigned int irq, struct irq_desc *desc) -{ - int events, irq_bit, i; - - events = oss->irq_pending & OSS_IP_NUBUS; - if (!events) - return; - -#ifdef DEBUG_NUBUS_INT - if (console_loglevel > 7) { - printk("oss_nubus_irq: events = 0x%04X\n", events); - } -#endif - /* There are only six slots on the OSS, not seven */ - - i = 6; - irq_bit = 0x40; - do { - --i; - irq_bit >>= 1; - if (events & irq_bit) { - oss->irq_pending &= ~irq_bit; - generic_handle_irq(NUBUS_SOURCE_BASE + i); - } - } while(events & (irq_bit - 1)); -} - -/* - * Register the OSS and NuBus interrupt dispatchers. - * - * This IRQ mapping is laid out with two things in mind: first, we try to keep - * things on their own levels to avoid having to do double-dispatches. Second, - * the levels match as closely as possible the alternate IRQ mapping mode (aka - * "A/UX mode") available on some VIA machines. - */ - -#define OSS_IRQLEV_IOPISM IRQ_AUTO_1 -#define OSS_IRQLEV_SCSI IRQ_AUTO_2 -#define OSS_IRQLEV_NUBUS IRQ_AUTO_3 -#define OSS_IRQLEV_IOPSCC IRQ_AUTO_4 -#define OSS_IRQLEV_VIA1 IRQ_AUTO_6 - -void __init oss_register_interrupts(void) -{ - irq_set_chained_handler(OSS_IRQLEV_IOPISM, oss_irq); - irq_set_chained_handler(OSS_IRQLEV_SCSI, oss_irq); - irq_set_chained_handler(OSS_IRQLEV_NUBUS, oss_nubus_irq); - irq_set_chained_handler(OSS_IRQLEV_IOPSCC, oss_irq); - irq_set_chained_handler(OSS_IRQLEV_VIA1, via1_irq); - - /* OSS_VIA1 gets enabled here because it has no machspec interrupt. */ - oss->irq_level[OSS_VIA1] = IRQ_AUTO_6; -} - -/* - * Enable an OSS interrupt - * - * It looks messy but it's rather straightforward. The switch() statement - * just maps the machspec interrupt numbers to the right OSS interrupt - * source (if the OSS handles that interrupt) and then sets the interrupt - * level for that source to nonzero, thus enabling the interrupt. - */ - -void oss_irq_enable(int irq) { -#ifdef DEBUG_IRQUSE - printk("oss_irq_enable(%d)\n", irq); -#endif - switch(irq) { - case IRQ_MAC_SCC: - oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_IOPSCC; - return; - case IRQ_MAC_ADB: - oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_IOPISM; - return; - case IRQ_MAC_SCSI: - oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI; - return; - case IRQ_NUBUS_9: - case IRQ_NUBUS_A: - case IRQ_NUBUS_B: - case IRQ_NUBUS_C: - case IRQ_NUBUS_D: - case IRQ_NUBUS_E: - irq -= NUBUS_SOURCE_BASE; - oss->irq_level[irq] = OSS_IRQLEV_NUBUS; - return; - } - - if (IRQ_SRC(irq) == 1) - via_irq_enable(irq); -} - -/* - * Disable an OSS interrupt - * - * Same as above except we set the source's interrupt level to zero, - * to disable the interrupt. - */ - -void oss_irq_disable(int irq) { -#ifdef DEBUG_IRQUSE - printk("oss_irq_disable(%d)\n", irq); -#endif - switch(irq) { - case IRQ_MAC_SCC: - oss->irq_level[OSS_IOPSCC] = 0; - return; - case IRQ_MAC_ADB: - oss->irq_level[OSS_IOPISM] = 0; - return; - case IRQ_MAC_SCSI: - oss->irq_level[OSS_SCSI] = 0; - return; - case IRQ_NUBUS_9: - case IRQ_NUBUS_A: - case IRQ_NUBUS_B: - case IRQ_NUBUS_C: - case IRQ_NUBUS_D: - case IRQ_NUBUS_E: - irq -= NUBUS_SOURCE_BASE; - oss->irq_level[irq] = 0; - return; - } - - if (IRQ_SRC(irq) == 1) - via_irq_disable(irq); -} |