2005-04-16 16:20:36 -06:00
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/*
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* Device driver for the via ADB on (many) Mac II-class machines
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*
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* Based on the original ADB keyboard handler Copyright (c) 1997 Alan Cox
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* Also derived from code Copyright (C) 1996 Paul Mackerras.
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*
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* With various updates provided over the years by Michael Schmitz,
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* Guideo Koerber and others.
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*
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* Rewrite for Unified ADB by Joshua M. Thompson (funaho@jurai.org)
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*
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* 1999-08-02 (jmt) - Initial rewrite for Unified ADB.
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* 2000-03-29 Tony Mantler <tonym@mac.linux-m68k.org>
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* - Big overhaul, should actually work now.
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2007-05-01 14:32:59 -06:00
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* 2006-12-31 Finn Thain <fthain@telegraphics.com.au> - Another overhaul.
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*
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* Suggested reading:
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* Inside Macintosh, ch. 5 ADB Manager
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* Guide to the Macinstosh Family Hardware, ch. 8 Apple Desktop Bus
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* Rockwell R6522 VIA datasheet
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*
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* Apple's "ADB Analyzer" bus sniffer is invaluable:
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* ftp://ftp.apple.com/developer/Tool_Chest/Devices_-_Hardware/Apple_Desktop_Bus/
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2005-04-16 16:20:36 -06:00
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*/
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#include <stdarg.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/adb.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/machw.h>
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#include <asm/mac_via.h>
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#include <asm/system.h>
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static volatile unsigned char *via;
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/* VIA registers - spaced 0x200 bytes apart */
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#define RS 0x200 /* skip between registers */
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#define B 0 /* B-side data */
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#define A RS /* A-side data */
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#define DIRB (2*RS) /* B-side direction (1=output) */
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#define DIRA (3*RS) /* A-side direction (1=output) */
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#define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */
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#define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */
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#define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */
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#define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */
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#define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */
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#define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */
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#define SR (10*RS) /* Shift register */
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#define ACR (11*RS) /* Auxiliary control register */
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#define PCR (12*RS) /* Peripheral control register */
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#define IFR (13*RS) /* Interrupt flag register */
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#define IER (14*RS) /* Interrupt enable register */
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#define ANH (15*RS) /* A-side data, no handshake */
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/* Bits in B data register: all active low */
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2007-05-01 14:32:59 -06:00
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#define CTLR_IRQ 0x08 /* Controller rcv status (input) */
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2005-04-16 16:20:36 -06:00
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#define ST_MASK 0x30 /* mask for selecting ADB state bits */
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/* Bits in ACR */
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#define SR_CTRL 0x1c /* Shift register control bits */
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#define SR_EXT 0x0c /* Shift on external clock */
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#define SR_OUT 0x10 /* Shift out if 1 */
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/* Bits in IFR and IER */
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#define IER_SET 0x80 /* set bits in IER */
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#define IER_CLR 0 /* clear bits in IER */
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#define SR_INT 0x04 /* Shift register full/empty */
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/* ADB transaction states according to GMHW */
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#define ST_CMD 0x00 /* ADB state: command byte */
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#define ST_EVEN 0x10 /* ADB state: even data byte */
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#define ST_ODD 0x20 /* ADB state: odd data byte */
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#define ST_IDLE 0x30 /* ADB state: idle, nothing to send */
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static int macii_init_via(void);
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static void macii_start(void);
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
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static irqreturn_t macii_interrupt(int irq, void *arg);
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2005-04-16 16:20:36 -06:00
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static void macii_queue_poll(void);
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static int macii_probe(void);
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static int macii_init(void);
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static int macii_send_request(struct adb_request *req, int sync);
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static int macii_write(struct adb_request *req);
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static int macii_autopoll(int devs);
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static void macii_poll(void);
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static int macii_reset_bus(void);
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struct adb_driver via_macii_driver = {
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"Mac II",
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macii_probe,
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macii_init,
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macii_send_request,
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macii_autopoll,
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macii_poll,
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macii_reset_bus
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};
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static enum macii_state {
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idle,
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sending,
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reading,
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read_done,
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} macii_state;
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2007-05-01 14:32:59 -06:00
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static struct adb_request *current_req; /* first request struct in the queue */
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static struct adb_request *last_req; /* last request struct in the queue */
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static unsigned char reply_buf[16]; /* storage for autopolled replies */
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static unsigned char *reply_ptr; /* next byte in req->data or reply_buf */
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static int reading_reply; /* store reply in reply_buf else req->reply */
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static int data_index; /* index of the next byte to send from req->data */
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static int reply_len; /* number of bytes received in reply_buf or req->reply */
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static int status; /* VIA's ADB status bits captured upon interrupt */
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static int last_status; /* status bits as at previous interrupt */
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static int srq_asserted; /* have to poll for the device that asserted it */
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static int command_byte; /* the most recent command byte transmitted */
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static int autopoll_devs; /* bits set are device addresses to be polled */
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/* Sanity check for request queue. Doesn't check for cycles. */
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static int request_is_queued(struct adb_request *req) {
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struct adb_request *cur;
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unsigned long flags;
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local_irq_save(flags);
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cur = current_req;
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while (cur) {
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if (cur == req) {
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local_irq_restore(flags);
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return 1;
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}
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cur = cur->next;
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}
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local_irq_restore(flags);
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return 0;
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}
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2005-04-16 16:20:36 -06:00
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/* Check for MacII style ADB */
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static int macii_probe(void)
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{
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if (macintosh_config->adb_type != MAC_ADB_II) return -ENODEV;
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via = via1;
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printk("adb: Mac II ADB Driver v1.0 for Unified ADB\n");
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return 0;
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}
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/* Initialize the driver */
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int macii_init(void)
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{
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unsigned long flags;
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int err;
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local_irq_save(flags);
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err = macii_init_via();
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2007-05-01 14:32:59 -06:00
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if (err) goto out;
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2005-04-16 16:20:36 -06:00
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err = request_irq(IRQ_MAC_ADB, macii_interrupt, IRQ_FLG_LOCK, "ADB",
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macii_interrupt);
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2007-05-01 14:32:59 -06:00
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if (err) goto out;
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2005-04-16 16:20:36 -06:00
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macii_state = idle;
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2007-05-01 14:32:59 -06:00
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out:
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2005-04-16 16:20:36 -06:00
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local_irq_restore(flags);
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2007-05-01 14:32:59 -06:00
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return err;
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2005-04-16 16:20:36 -06:00
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}
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/* initialize the hardware */
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static int macii_init_via(void)
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{
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unsigned char x;
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2007-05-01 14:32:59 -06:00
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/* We want CTLR_IRQ as input and ST_EVEN | ST_ODD as output lines. */
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via[DIRB] = (via[DIRB] | ST_EVEN | ST_ODD) & ~CTLR_IRQ;
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2005-04-16 16:20:36 -06:00
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/* Set up state: idle */
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via[B] |= ST_IDLE;
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2007-05-01 14:32:59 -06:00
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last_status = via[B] & (ST_MASK|CTLR_IRQ);
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2005-04-16 16:20:36 -06:00
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/* Shift register on input */
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via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT;
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/* Wipe any pending data and int */
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x = via[SR];
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return 0;
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}
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2007-05-01 14:32:59 -06:00
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/* Send an ADB poll (Talk Register 0 command prepended to the request queue) */
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2005-04-16 16:20:36 -06:00
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static void macii_queue_poll(void)
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{
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2007-05-01 14:32:59 -06:00
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/* No point polling the active device as it will never assert SRQ, so
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* poll the next device in the autopoll list. This could leave us
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* stuck in a polling loop if an unprobed device is asserting SRQ.
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* In theory, that could only happen if a device was plugged in after
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* probing started. Unplugging it again will break the cycle.
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* (Simply polling the next higher device often ends up polling almost
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* every device (after wrapping around), which takes too long.)
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*/
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int device_mask;
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int next_device;
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2005-04-16 16:20:36 -06:00
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static struct adb_request req;
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2007-05-01 14:32:59 -06:00
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if (!autopoll_devs) return;
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2005-04-16 16:20:36 -06:00
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2007-05-01 14:32:59 -06:00
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device_mask = (1 << (((command_byte & 0xF0) >> 4) + 1)) - 1;
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if (autopoll_devs & ~device_mask)
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next_device = ffs(autopoll_devs & ~device_mask) - 1;
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else
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next_device = ffs(autopoll_devs) - 1;
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2005-04-16 16:20:36 -06:00
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2007-05-01 14:32:59 -06:00
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BUG_ON(request_is_queued(&req));
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2005-04-16 16:20:36 -06:00
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2007-05-01 14:32:59 -06:00
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adb_request(&req, NULL, ADBREQ_NOSEND, 1,
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ADB_READREG(next_device, 0));
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2005-04-16 16:20:36 -06:00
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2007-05-01 14:32:59 -06:00
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req.sent = 0;
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req.complete = 0;
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req.reply_len = 0;
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req.next = current_req;
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2005-04-16 16:20:36 -06:00
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if (current_req != NULL) {
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2007-05-01 14:32:59 -06:00
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current_req = &req;
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2005-04-16 16:20:36 -06:00
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} else {
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2007-05-01 14:32:59 -06:00
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current_req = &req;
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last_req = &req;
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2005-04-16 16:20:36 -06:00
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}
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}
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/* Send an ADB request; if sync, poll out the reply 'till it's done */
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static int macii_send_request(struct adb_request *req, int sync)
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{
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2007-05-01 14:32:59 -06:00
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int err;
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unsigned long flags;
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2005-04-16 16:20:36 -06:00
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2007-05-01 14:32:59 -06:00
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BUG_ON(request_is_queued(req));
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2005-04-16 16:20:36 -06:00
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2007-05-01 14:32:59 -06:00
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local_irq_save(flags);
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err = macii_write(req);
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local_irq_restore(flags);
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if (!err && sync) {
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while (!req->complete) {
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macii_poll();
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}
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BUG_ON(request_is_queued(req));
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2005-04-16 16:20:36 -06:00
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}
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2007-05-01 14:32:59 -06:00
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return err;
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2005-04-16 16:20:36 -06:00
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}
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2007-05-01 14:32:59 -06:00
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/* Send an ADB request (append to request queue) */
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2005-04-16 16:20:36 -06:00
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static int macii_write(struct adb_request *req)
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{
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if (req->nbytes < 2 || req->data[0] != ADB_PACKET || req->nbytes > 15) {
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req->complete = 1;
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return -EINVAL;
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}
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2006-01-12 02:06:34 -07:00
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req->next = NULL;
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2005-04-16 16:20:36 -06:00
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req->sent = 0;
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req->complete = 0;
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req->reply_len = 0;
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if (current_req != NULL) {
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last_req->next = req;
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last_req = req;
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} else {
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current_req = req;
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last_req = req;
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if (macii_state == idle) macii_start();
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}
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return 0;
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}
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/* Start auto-polling */
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static int macii_autopoll(int devs)
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|
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{
|
2007-05-01 14:32:59 -06:00
|
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static struct adb_request req;
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unsigned long flags;
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int err = 0;
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/* bit 1 == device 1, and so on. */
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autopoll_devs = devs & 0xFFFE;
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if (!autopoll_devs) return 0;
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local_irq_save(flags);
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if (current_req == NULL) {
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/* Send a Talk Reg 0. The controller will repeatedly transmit
|
|
|
|
* this as long as it is idle.
|
|
|
|
*/
|
|
|
|
adb_request(&req, NULL, ADBREQ_NOSEND, 1,
|
|
|
|
ADB_READREG(ffs(autopoll_devs) - 1, 0));
|
|
|
|
err = macii_write(&req);
|
|
|
|
}
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int need_autopoll(void) {
|
|
|
|
/* Was the last command Talk Reg 0
|
|
|
|
* and is the target on the autopoll list?
|
|
|
|
*/
|
|
|
|
if ((command_byte & 0x0F) == 0x0C &&
|
|
|
|
((1 << ((command_byte & 0xF0) >> 4)) & autopoll_devs))
|
|
|
|
return 0;
|
|
|
|
return 1;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Prod the chip without interrupts */
|
|
|
|
static void macii_poll(void)
|
|
|
|
{
|
2007-05-01 14:32:59 -06:00
|
|
|
disable_irq(IRQ_MAC_ADB);
|
|
|
|
macii_interrupt(0, NULL);
|
|
|
|
enable_irq(IRQ_MAC_ADB);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Reset the bus */
|
|
|
|
static int macii_reset_bus(void)
|
|
|
|
{
|
|
|
|
static struct adb_request req;
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
if (request_is_queued(&req))
|
|
|
|
return 0;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Command = 0, Address = ignored */
|
|
|
|
adb_request(&req, NULL, 0, 1, ADB_BUSRESET);
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
/* Don't want any more requests during the Global Reset low time. */
|
|
|
|
udelay(3000);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Start sending ADB packet */
|
|
|
|
static void macii_start(void)
|
|
|
|
{
|
|
|
|
struct adb_request *req;
|
|
|
|
|
|
|
|
req = current_req;
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
BUG_ON(req == NULL);
|
|
|
|
|
|
|
|
BUG_ON(macii_state != idle);
|
|
|
|
|
|
|
|
/* Now send it. Be careful though, that first byte of the request
|
|
|
|
* is actually ADB_PACKET; the real data begins at index 1!
|
|
|
|
* And req->nbytes is the number of bytes of real data plus one.
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
|
|
|
|
|
|
|
/* store command byte */
|
|
|
|
command_byte = req->data[1];
|
|
|
|
/* Output mode */
|
|
|
|
via[ACR] |= SR_OUT;
|
|
|
|
/* Load data */
|
|
|
|
via[SR] = req->data[1];
|
|
|
|
/* set ADB state to 'command' */
|
|
|
|
via[B] = (via[B] & ~ST_MASK) | ST_CMD;
|
|
|
|
|
|
|
|
macii_state = sending;
|
|
|
|
data_index = 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-01 14:32:59 -06:00
|
|
|
* The notorious ADB interrupt handler - does all of the protocol handling.
|
|
|
|
* Relies on the ADB controller sending and receiving data, thereby
|
|
|
|
* generating shift register interrupts (SR_INT) for us. This means there has
|
|
|
|
* to be activity on the ADB bus. The chip will poll to achieve this.
|
2005-04-16 16:20:36 -06:00
|
|
|
*
|
|
|
|
* The basic ADB state machine was left unchanged from the original MacII code
|
|
|
|
* by Alan Cox, which was based on the CUDA driver for PowerMac.
|
2007-05-01 14:32:59 -06:00
|
|
|
* The syntax of the ADB status lines is totally different on MacII,
|
|
|
|
* though. MacII uses the states Command -> Even -> Odd -> Even ->...-> Idle
|
|
|
|
* for sending and Idle -> Even -> Odd -> Even ->...-> Idle for receiving.
|
|
|
|
* Start and end of a receive packet are signalled by asserting /IRQ on the
|
|
|
|
* interrupt line (/IRQ means the CTLR_IRQ bit in port B; not to be confused
|
|
|
|
* with the VIA shift register interrupt. /IRQ never actually interrupts the
|
|
|
|
* processor, it's just an ordinary input.)
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
|
|
|
static irqreturn_t macii_interrupt(int irq, void *arg)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2007-05-01 14:32:59 -06:00
|
|
|
int x;
|
|
|
|
static int entered;
|
2005-04-16 16:20:36 -06:00
|
|
|
struct adb_request *req;
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
if (!arg) {
|
|
|
|
/* Clear the SR IRQ flag when polling. */
|
|
|
|
if (via[IFR] & SR_INT)
|
|
|
|
via[IFR] = SR_INT;
|
|
|
|
else
|
|
|
|
return IRQ_NONE;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
BUG_ON(entered++);
|
|
|
|
|
|
|
|
last_status = status;
|
|
|
|
status = via[B] & (ST_MASK|CTLR_IRQ);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
switch (macii_state) {
|
|
|
|
case idle:
|
2007-05-01 14:32:59 -06:00
|
|
|
if (reading_reply) {
|
|
|
|
reply_ptr = current_req->reply;
|
|
|
|
} else {
|
|
|
|
BUG_ON(current_req != NULL);
|
|
|
|
reply_ptr = reply_buf;
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
x = via[SR];
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
if ((status & CTLR_IRQ) && (x == 0xFF)) {
|
|
|
|
/* Bus timeout without SRQ sequence:
|
|
|
|
* data is "FF" while CTLR_IRQ is "H"
|
|
|
|
*/
|
|
|
|
reply_len = 0;
|
|
|
|
srq_asserted = 0;
|
|
|
|
macii_state = read_done;
|
|
|
|
} else {
|
|
|
|
macii_state = reading;
|
|
|
|
*reply_ptr = x;
|
|
|
|
reply_len = 1;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* set ADB state = even for first data byte */
|
|
|
|
via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case sending:
|
|
|
|
req = current_req;
|
|
|
|
if (data_index >= req->nbytes) {
|
|
|
|
req->sent = 1;
|
2007-05-01 14:32:59 -06:00
|
|
|
macii_state = idle;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
if (req->reply_expected) {
|
2007-05-01 14:32:59 -06:00
|
|
|
reading_reply = 1;
|
2005-04-16 16:20:36 -06:00
|
|
|
} else {
|
|
|
|
req->complete = 1;
|
|
|
|
current_req = req->next;
|
|
|
|
if (req->done) (*req->done)(req);
|
2007-05-01 14:32:59 -06:00
|
|
|
|
|
|
|
if (current_req)
|
2005-04-16 16:20:36 -06:00
|
|
|
macii_start();
|
|
|
|
else
|
2007-05-01 14:32:59 -06:00
|
|
|
if (need_autopoll())
|
|
|
|
macii_autopoll(autopoll_devs);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (macii_state == idle) {
|
|
|
|
/* reset to shift in */
|
|
|
|
via[ACR] &= ~SR_OUT;
|
|
|
|
x = via[SR];
|
|
|
|
/* set ADB state idle - might get SRQ */
|
|
|
|
via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
via[SR] = req->data[data_index++];
|
|
|
|
|
|
|
|
if ( (via[B] & ST_MASK) == ST_CMD ) {
|
|
|
|
/* just sent the command byte, set to EVEN */
|
|
|
|
via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
|
|
|
|
} else {
|
|
|
|
/* invert state bits, toggle ODD/EVEN */
|
|
|
|
via[B] ^= ST_MASK;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case reading:
|
2007-05-01 14:32:59 -06:00
|
|
|
x = via[SR];
|
|
|
|
BUG_ON((status & ST_MASK) == ST_CMD ||
|
|
|
|
(status & ST_MASK) == ST_IDLE);
|
|
|
|
|
|
|
|
/* Bus timeout with SRQ sequence:
|
|
|
|
* data is "XX FF" while CTLR_IRQ is "L L"
|
|
|
|
* End of packet without SRQ sequence:
|
|
|
|
* data is "XX...YY 00" while CTLR_IRQ is "L...H L"
|
|
|
|
* End of packet SRQ sequence:
|
|
|
|
* data is "XX...YY 00" while CTLR_IRQ is "L...L L"
|
|
|
|
* (where XX is the first response byte and
|
|
|
|
* YY is the last byte of valid response data.)
|
|
|
|
*/
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
srq_asserted = 0;
|
|
|
|
if (!(status & CTLR_IRQ)) {
|
|
|
|
if (x == 0xFF) {
|
|
|
|
if (!(last_status & CTLR_IRQ)) {
|
|
|
|
macii_state = read_done;
|
|
|
|
reply_len = 0;
|
|
|
|
srq_asserted = 1;
|
|
|
|
}
|
|
|
|
} else if (x == 0x00) {
|
|
|
|
macii_state = read_done;
|
|
|
|
if (!(last_status & CTLR_IRQ))
|
|
|
|
srq_asserted = 1;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2007-05-01 14:32:59 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
if (macii_state == reading) {
|
|
|
|
BUG_ON(reply_len > 15);
|
2005-04-16 16:20:36 -06:00
|
|
|
reply_ptr++;
|
2007-05-01 14:32:59 -06:00
|
|
|
*reply_ptr = x;
|
2005-04-16 16:20:36 -06:00
|
|
|
reply_len++;
|
|
|
|
}
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
/* invert state bits, toggle ODD/EVEN */
|
|
|
|
via[B] ^= ST_MASK;
|
2005-04-16 16:20:36 -06:00
|
|
|
break;
|
|
|
|
|
|
|
|
case read_done:
|
|
|
|
x = via[SR];
|
2007-05-01 14:32:59 -06:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
if (reading_reply) {
|
2007-05-01 14:32:59 -06:00
|
|
|
reading_reply = 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
req = current_req;
|
2007-05-01 14:32:59 -06:00
|
|
|
req->reply_len = reply_len;
|
2005-04-16 16:20:36 -06:00
|
|
|
req->complete = 1;
|
|
|
|
current_req = req->next;
|
|
|
|
if (req->done) (*req->done)(req);
|
2007-05-01 14:32:59 -06:00
|
|
|
} else if (reply_len && autopoll_devs)
|
|
|
|
adb_input(reply_buf, reply_len, 0);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
macii_state = idle;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* SRQ seen before, initiate poll now */
|
2007-05-01 14:32:59 -06:00
|
|
|
if (srq_asserted)
|
2005-04-16 16:20:36 -06:00
|
|
|
macii_queue_poll();
|
|
|
|
|
2007-05-01 14:32:59 -06:00
|
|
|
if (current_req)
|
|
|
|
macii_start();
|
|
|
|
else
|
|
|
|
if (need_autopoll())
|
|
|
|
macii_autopoll(autopoll_devs);
|
|
|
|
|
|
|
|
if (macii_state == idle)
|
|
|
|
via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
|
2005-04-16 16:20:36 -06:00
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
2007-05-01 14:32:59 -06:00
|
|
|
|
|
|
|
entered--;
|
2005-04-16 16:20:36 -06:00
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|