diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/m68k/mac/via.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/m68k/mac/via.c | 622 |
1 files changed, 0 insertions, 622 deletions
diff --git a/ANDROID_3.4.5/arch/m68k/mac/via.c b/ANDROID_3.4.5/arch/m68k/mac/via.c deleted file mode 100644 index 2d856627..00000000 --- a/ANDROID_3.4.5/arch/m68k/mac/via.c +++ /dev/null @@ -1,622 +0,0 @@ -/* - * 6522 Versatile Interface Adapter (VIA) - * - * There are two of these on the Mac II. Some IRQs are vectored - * via them as are assorted bits and bobs - eg RTC, ADB. - * - * CSA: Motorola seems to have removed documentation on the 6522 from - * their web site; try - * http://nerini.drf.com/vectrex/other/text/chips/6522/ - * http://www.zymurgy.net/classic/vic20/vicdet1.htm - * and - * http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html - * for info. A full-text web search on 6522 AND VIA will probably also - * net some usefulness. <cananian@alumni.princeton.edu> 20apr1999 - * - * Additional data is here (the SY6522 was used in the Mac II etc): - * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf - * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf - * - * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b - * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org) - * - */ - -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/module.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_psc.h> -#include <asm/mac_oss.h> - -volatile __u8 *via1, *via2; -int rbv_present; -int via_alt_mapping; -EXPORT_SYMBOL(via_alt_mapping); -static __u8 rbv_clear; - -/* - * Globals for accessing the VIA chip registers without having to - * check if we're hitting a real VIA or an RBV. Normally you could - * just hit the combined register (ie, vIER|rIER) but that seems to - * break on AV Macs...probably because they actually decode more than - * eight address bits. Why can't Apple engineers at least be - * _consistently_ lazy? - 1999-05-21 (jmt) - */ - -static int gIER,gIFR,gBufA,gBufB; - -/* - * Timer defs. - */ - -#define TICK_SIZE 10000 -#define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ -#define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) -#define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) - - -/* - * On Macs with a genuine VIA chip there is no way to mask an individual slot - * interrupt. This limitation also seems to apply to VIA clone logic cores in - * Quadra-like ASICs. (RBV and OSS machines don't have this limitation.) - * - * We used to fake it by configuring the relevent VIA pin as an output - * (to mask the interrupt) or input (to unmask). That scheme did not work on - * (at least) the Quadra 700. A NuBus card's /NMRQ signal is an open-collector - * circuit (see Designing Cards and Drivers for Macintosh II and Macintosh SE, - * p. 10-11 etc) but VIA outputs are not (see datasheet). - * - * Driving these outputs high must cause the VIA to source current and the - * card to sink current when it asserts /NMRQ. Current will flow but the pin - * voltage is uncertain and so the /NMRQ condition may still cause a transition - * at the VIA2 CA1 input (which explains the lost interrupts). A side effect - * is that a disabled slot IRQ can never be tested as pending or not. - * - * Driving these outputs low doesn't work either. All the slot /NMRQ lines are - * (active low) OR'd together to generate the CA1 (aka "SLOTS") interrupt (see - * The Guide To Macintosh Family Hardware, 2nd edition p. 167). If we drive a - * disabled /NMRQ line low, the falling edge immediately triggers a CA1 - * interrupt and all slot interrupts after that will generate no transition - * and therefore no interrupt, even after being re-enabled. - * - * So we make the VIA port A I/O lines inputs and use nubus_disabled to keep - * track of their states. When any slot IRQ becomes disabled we mask the CA1 - * umbrella interrupt. Only when all slot IRQs become enabled do we unmask - * the CA1 interrupt. It must remain enabled even when cards have no interrupt - * handler registered. Drivers must therefore disable a slot interrupt at the - * device before they call free_irq (like shared and autovector interrupts). - * - * There is also a related problem when MacOS is used to boot Linux. A network - * card brought up by a MacOS driver may raise an interrupt while Linux boots. - * This can be fatal since it can't be handled until the right driver loads - * (if such a driver exists at all). Apparently related to this hardware - * limitation, "Designing Cards and Drivers", p. 9-8, says that a slot - * interrupt with no driver would crash MacOS (the book was written before - * the appearance of Macs with RBV or OSS). - */ - -static u8 nubus_disabled; - -void via_debug_dump(void); - -/* - * Initialize the VIAs - * - * First we figure out where they actually _are_ as well as what type of - * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) - * Then we pretty much clear them out and disable all IRQ sources. - * - * Note: the OSS is actually "detected" here and not in oss_init(). It just - * seems more logical to do it here since via_init() needs to know - * these things anyways. - */ - -void __init via_init(void) -{ - switch(macintosh_config->via_type) { - - /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ - - case MAC_VIA_IICI: - via1 = (void *) VIA1_BASE; - if (macintosh_config->ident == MAC_MODEL_IIFX) { - via2 = NULL; - rbv_present = 0; - oss_present = 1; - } else { - via2 = (void *) RBV_BASE; - rbv_present = 1; - oss_present = 0; - } - if (macintosh_config->ident == MAC_MODEL_LCIII) { - rbv_clear = 0x00; - } else { - /* on most RBVs (& unlike the VIAs), you */ - /* need to set bit 7 when you write to IFR */ - /* in order for your clear to occur. */ - rbv_clear = 0x80; - } - gIER = rIER; - gIFR = rIFR; - gBufA = rSIFR; - gBufB = rBufB; - break; - - /* Quadra and early MacIIs agree on the VIA locations */ - - case MAC_VIA_QUADRA: - case MAC_VIA_II: - via1 = (void *) VIA1_BASE; - via2 = (void *) VIA2_BASE; - rbv_present = 0; - oss_present = 0; - rbv_clear = 0x00; - gIER = vIER; - gIFR = vIFR; - gBufA = vBufA; - gBufB = vBufB; - break; - default: - panic("UNKNOWN VIA TYPE"); - } - - printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); - - printk(KERN_INFO "VIA2 at %p is ", via2); - if (rbv_present) { - printk("an RBV\n"); - } else if (oss_present) { - printk("an OSS\n"); - } else { - printk("a 6522 or clone\n"); - } - -#ifdef DEBUG_VIA - via_debug_dump(); -#endif - - /* - * Shut down all IRQ sources, reset the timers, and - * kill the timer latch on VIA1. - */ - - via1[vIER] = 0x7F; - via1[vIFR] = 0x7F; - via1[vT1LL] = 0; - via1[vT1LH] = 0; - via1[vT1CL] = 0; - via1[vT1CH] = 0; - via1[vT2CL] = 0; - via1[vT2CH] = 0; - via1[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */ - via1[vACR] &= ~0x03; /* disable port A & B latches */ - - /* - * SE/30: disable video IRQ - * XXX: testing for SE/30 VBL - */ - - if (macintosh_config->ident == MAC_MODEL_SE30) { - via1[vDirB] |= 0x40; - via1[vBufB] |= 0x40; - } - - /* - * Set the RTC bits to a known state: all lines to outputs and - * RTC disabled (yes that's 0 to enable and 1 to disable). - */ - - via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); - via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); - - /* Everything below this point is VIA2/RBV only... */ - - if (oss_present) - return; - - if ((macintosh_config->via_type == MAC_VIA_QUADRA) && - (macintosh_config->adb_type != MAC_ADB_PB1) && - (macintosh_config->adb_type != MAC_ADB_PB2) && - (macintosh_config->ident != MAC_MODEL_C660) && - (macintosh_config->ident != MAC_MODEL_Q840)) { - via_alt_mapping = 1; - via1[vDirB] |= 0x40; - via1[vBufB] &= ~0x40; - } else { - via_alt_mapping = 0; - } - - /* - * Now initialize VIA2. For RBV we just kill all interrupts; - * for a regular VIA we also reset the timers and stuff. - */ - - via2[gIER] = 0x7F; - via2[gIFR] = 0x7F | rbv_clear; - if (!rbv_present) { - via2[vT1LL] = 0; - via2[vT1LH] = 0; - via2[vT1CL] = 0; - via2[vT1CH] = 0; - via2[vT2CL] = 0; - via2[vT2CH] = 0; - via2[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */ - via2[vACR] &= ~0x03; /* disable port A & B latches */ - } - - /* Everything below this point is VIA2 only... */ - - if (rbv_present) - return; - - /* - * Set vPCR for control line interrupts. - * - * CA1 (SLOTS IRQ), CB1 (ASC IRQ): negative edge trigger. - * - * Macs with ESP SCSI have a negative edge triggered SCSI interrupt. - * Testing reveals that PowerBooks do too. However, the SE/30 - * schematic diagram shows an active high NCR5380 IRQ line. - */ - - pr_debug("VIA2 vPCR is 0x%02X\n", via2[vPCR]); - if (macintosh_config->via_type == MAC_VIA_II) { - /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, pos. edge */ - via2[vPCR] = 0x66; - } else { - /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, neg. edge */ - via2[vPCR] = 0x22; - } -} - -/* - * Start the 100 Hz clock - */ - -void __init via_init_clock(irq_handler_t func) -{ - via1[vACR] |= 0x40; - via1[vT1LL] = MAC_CLOCK_LOW; - via1[vT1LH] = MAC_CLOCK_HIGH; - via1[vT1CL] = MAC_CLOCK_LOW; - via1[vT1CH] = MAC_CLOCK_HIGH; - - if (request_irq(IRQ_MAC_TIMER_1, func, 0, "timer", func)) - pr_err("Couldn't register %s interrupt\n", "timer"); -} - -/* - * Debugging dump, used in various places to see what's going on. - */ - -void via_debug_dump(void) -{ - printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", - (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); - printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", - (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); - if (oss_present) { - printk(KERN_DEBUG "VIA2: <OSS>\n"); - } else if (rbv_present) { - printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", - (uint) via2[rIFR], (uint) via2[rIER]); - printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", - (uint) via2[rSIFR], (uint) via2[rSIER]); - } else { - printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", - (uint) via2[vDirA], (uint) via2[vDirB], - (uint) via2[vACR]); - printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", - (uint) via2[vPCR], - (uint) via2[vIFR], (uint) via2[vIER]); - } -} - -/* - * This is always executed with interrupts disabled. - * - * TBI: get time offset between scheduling timer ticks - */ - -unsigned long mac_gettimeoffset (void) -{ - unsigned long ticks, offset = 0; - - /* read VIA1 timer 2 current value */ - ticks = via1[vT1CL] | (via1[vT1CH] << 8); - /* The probability of underflow is less than 2% */ - if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) - /* Check for pending timer interrupt in VIA1 IFR */ - if (via1[vIFR] & 0x40) offset = TICK_SIZE; - - ticks = MAC_CLOCK_TICK - ticks; - ticks = ticks * 10000L / MAC_CLOCK_TICK; - - return ticks + offset; -} - -/* - * Flush the L2 cache on Macs that have it by flipping - * the system into 24-bit mode for an instant. - */ - -void via_flush_cache(void) -{ - via2[gBufB] &= ~VIA2B_vMode32; - via2[gBufB] |= VIA2B_vMode32; -} - -/* - * Return the status of the L2 cache on a IIci - */ - -int via_get_cache_disable(void) -{ - /* Safeguard against being called accidentally */ - if (!via2) { - printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); - return 1; - } - - return (int) via2[gBufB] & VIA2B_vCDis; -} - -/* - * Initialize VIA2 for Nubus access - */ - -void __init via_nubus_init(void) -{ - /* unlock nubus transactions */ - - if ((macintosh_config->adb_type != MAC_ADB_PB1) && - (macintosh_config->adb_type != MAC_ADB_PB2)) { - /* set the line to be an output on non-RBV machines */ - if (!rbv_present) - via2[vDirB] |= 0x02; - - /* this seems to be an ADB bit on PMU machines */ - /* according to MkLinux. -- jmt */ - via2[gBufB] |= 0x02; - } - - /* - * Disable the slot interrupts. On some hardware that's not possible. - * On some hardware it's unclear what all of these I/O lines do. - */ - - switch (macintosh_config->via_type) { - case MAC_VIA_II: - case MAC_VIA_QUADRA: - pr_debug("VIA2 vDirA is 0x%02X\n", via2[vDirA]); - break; - case MAC_VIA_IICI: - /* RBV. Disable all the slot interrupts. SIER works like IER. */ - via2[rSIER] = 0x7F; - break; - } -} - -void via_nubus_irq_startup(int irq) -{ - int irq_idx = IRQ_IDX(irq); - - switch (macintosh_config->via_type) { - case MAC_VIA_II: - case MAC_VIA_QUADRA: - /* Make the port A line an input. Probably redundant. */ - if (macintosh_config->via_type == MAC_VIA_II) { - /* The top two bits are RAM size outputs. */ - via2[vDirA] &= 0xC0 | ~(1 << irq_idx); - } else { - /* Allow NuBus slots 9 through F. */ - via2[vDirA] &= 0x80 | ~(1 << irq_idx); - } - /* fall through */ - case MAC_VIA_IICI: - via_irq_enable(irq); - break; - } -} - -void via_nubus_irq_shutdown(int irq) -{ - switch (macintosh_config->via_type) { - case MAC_VIA_II: - case MAC_VIA_QUADRA: - /* Ensure that the umbrella CA1 interrupt remains enabled. */ - via_irq_enable(irq); - break; - case MAC_VIA_IICI: - via_irq_disable(irq); - break; - } -} - -/* - * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's - * via6522.c :-), disable/pending masks added. - */ - -void via1_irq(unsigned int irq, struct irq_desc *desc) -{ - int irq_num; - unsigned char irq_bit, events; - - events = via1[vIFR] & via1[vIER] & 0x7F; - if (!events) - return; - - irq_num = VIA1_SOURCE_BASE; - irq_bit = 1; - do { - if (events & irq_bit) { - via1[vIFR] = irq_bit; - generic_handle_irq(irq_num); - } - ++irq_num; - irq_bit <<= 1; - } while (events >= irq_bit); -} - -static void via2_irq(unsigned int irq, struct irq_desc *desc) -{ - int irq_num; - unsigned char irq_bit, events; - - events = via2[gIFR] & via2[gIER] & 0x7F; - if (!events) - return; - - irq_num = VIA2_SOURCE_BASE; - irq_bit = 1; - do { - if (events & irq_bit) { - via2[gIFR] = irq_bit | rbv_clear; - generic_handle_irq(irq_num); - } - ++irq_num; - irq_bit <<= 1; - } while (events >= irq_bit); -} - -/* - * Dispatch Nubus interrupts. We are called as a secondary dispatch by the - * VIA2 dispatcher as a fast interrupt handler. - */ - -void via_nubus_irq(unsigned int irq, struct irq_desc *desc) -{ - int slot_irq; - unsigned char slot_bit, events; - - events = ~via2[gBufA] & 0x7F; - if (rbv_present) - events &= via2[rSIER]; - else - events &= ~via2[vDirA]; - if (!events) - return; - - do { - slot_irq = IRQ_NUBUS_F; - slot_bit = 0x40; - do { - if (events & slot_bit) { - events &= ~slot_bit; - generic_handle_irq(slot_irq); - } - --slot_irq; - slot_bit >>= 1; - } while (events); - - /* clear the CA1 interrupt and make certain there's no more. */ - via2[gIFR] = 0x02 | rbv_clear; - events = ~via2[gBufA] & 0x7F; - if (rbv_present) - events &= via2[rSIER]; - else - events &= ~via2[vDirA]; - } while (events); -} - -/* - * Register the interrupt dispatchers for VIA or RBV machines only. - */ - -void __init via_register_interrupts(void) -{ - if (via_alt_mapping) { - /* software interrupt */ - irq_set_chained_handler(IRQ_AUTO_1, via1_irq); - /* via1 interrupt */ - irq_set_chained_handler(IRQ_AUTO_6, via1_irq); - } else { - irq_set_chained_handler(IRQ_AUTO_1, via1_irq); - } - irq_set_chained_handler(IRQ_AUTO_2, via2_irq); - irq_set_chained_handler(IRQ_MAC_NUBUS, via_nubus_irq); -} - -void via_irq_enable(int irq) { - int irq_src = IRQ_SRC(irq); - int irq_idx = IRQ_IDX(irq); - -#ifdef DEBUG_IRQUSE - printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); -#endif - - if (irq_src == 1) { - via1[vIER] = IER_SET_BIT(irq_idx); - } else if (irq_src == 2) { - if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0) - via2[gIER] = IER_SET_BIT(irq_idx); - } else if (irq_src == 7) { - switch (macintosh_config->via_type) { - case MAC_VIA_II: - case MAC_VIA_QUADRA: - nubus_disabled &= ~(1 << irq_idx); - /* Enable the CA1 interrupt when no slot is disabled. */ - if (!nubus_disabled) - via2[gIER] = IER_SET_BIT(1); - break; - case MAC_VIA_IICI: - /* On RBV, enable the slot interrupt. - * SIER works like IER. - */ - via2[rSIER] = IER_SET_BIT(irq_idx); - break; - } - } -} - -void via_irq_disable(int irq) { - int irq_src = IRQ_SRC(irq); - int irq_idx = IRQ_IDX(irq); - -#ifdef DEBUG_IRQUSE - printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); -#endif - - if (irq_src == 1) { - via1[vIER] = IER_CLR_BIT(irq_idx); - } else if (irq_src == 2) { - via2[gIER] = IER_CLR_BIT(irq_idx); - } else if (irq_src == 7) { - switch (macintosh_config->via_type) { - case MAC_VIA_II: - case MAC_VIA_QUADRA: - nubus_disabled |= 1 << irq_idx; - if (nubus_disabled) - via2[gIER] = IER_CLR_BIT(1); - break; - case MAC_VIA_IICI: - via2[rSIER] = IER_CLR_BIT(irq_idx); - break; - } - } -} - -void via1_set_head(int head) -{ - if (head == 0) - via1[vBufA] &= ~VIA1A_vHeadSel; - else - via1[vBufA] |= VIA1A_vHeadSel; -} -EXPORT_SYMBOL(via1_set_head); - -int via2_scsi_drq_pending(void) -{ - return via2[gIFR] & (1 << IRQ_IDX(IRQ_MAC_SCSIDRQ)); -} -EXPORT_SYMBOL(via2_scsi_drq_pending); |