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39f75da7bc
Delete/fixup few includes in anticipation of global -isystem compile option removal. Note: crypto/aegis128-neon-inner.c keeps <stddef.h> due to redefinition of uintptr_t error (one definition comes from <stddef.h>, another from <linux/types.h>). Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
565 lines
14 KiB
C
565 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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* 2006-12-31 Finn Thain - 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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*/
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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/mac_via.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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#define CTLR_IRQ 0x08 /* Controller rcv status (input) */
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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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/* ADB command byte structure */
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#define ADDR_MASK 0xF0
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#define CMD_MASK 0x0F
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#define OP_MASK 0x0C
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#define TALK 0x0C
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static int macii_init_via(void);
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static void macii_start(void);
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static irqreturn_t macii_interrupt(int irq, void *arg);
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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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.name = "Mac II",
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.probe = macii_probe,
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.init = macii_init,
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.send_request = macii_send_request,
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.autopoll = macii_autopoll,
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.poll = macii_poll,
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.reset_bus = 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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} macii_state;
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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 reply_buf or req->reply */
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static bool 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 bool bus_timeout; /* no data was sent by the device */
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static bool srq_asserted; /* have to poll for the device that asserted it */
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static u8 last_cmd; /* the most recent command byte transmitted */
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static u8 last_talk_cmd; /* the most recent Talk command byte transmitted */
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static u8 last_poll_cmd; /* the most recent Talk R0 command byte transmitted */
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static unsigned int autopoll_devs; /* bits set are device addresses to poll */
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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)
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return -ENODEV;
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via = via1;
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pr_info("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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static 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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if (err)
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goto out;
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err = request_irq(IRQ_MAC_ADB, macii_interrupt, 0, "ADB",
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macii_interrupt);
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if (err)
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goto out;
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macii_state = idle;
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out:
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local_irq_restore(flags);
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return err;
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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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/* 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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/* Set up state: idle */
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via[B] |= ST_IDLE;
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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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/* Send an ADB poll (Talk Register 0 command prepended to the request queue) */
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static void macii_queue_poll(void)
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{
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static struct adb_request req;
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unsigned char poll_command;
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unsigned int poll_addr;
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/* This only polls devices in the autopoll list, which assumes that
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* unprobed devices never assert SRQ. That could happen if a device was
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* plugged in after the adb bus scan. Unplugging it again will resolve
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* the problem. This behaviour is similar to MacOS.
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*/
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if (!autopoll_devs)
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return;
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/* The device most recently polled may not be the best device to poll
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* right now. Some other device(s) may have signalled SRQ (the active
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* device won't do that). Or the autopoll list may have been changed.
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* Try polling the next higher address.
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*/
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poll_addr = (last_poll_cmd & ADDR_MASK) >> 4;
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if ((srq_asserted && last_cmd == last_poll_cmd) ||
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!(autopoll_devs & (1 << poll_addr))) {
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unsigned int higher_devs;
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higher_devs = autopoll_devs & -(1 << (poll_addr + 1));
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poll_addr = ffs(higher_devs ? higher_devs : autopoll_devs) - 1;
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}
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/* Send a Talk Register 0 command */
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poll_command = ADB_READREG(poll_addr, 0);
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/* No need to repeat this Talk command. The transceiver will do that
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* as long as it is idle.
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*/
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if (poll_command == last_cmd)
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return;
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adb_request(&req, NULL, ADBREQ_NOSEND, 1, poll_command);
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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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if (WARN_ON(current_req)) {
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current_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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}
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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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int err;
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err = macii_write(req);
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if (err)
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return err;
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if (sync)
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while (!req->complete)
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macii_poll();
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return 0;
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}
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/* Send an ADB request (append to request queue) */
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static int macii_write(struct adb_request *req)
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{
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unsigned long flags;
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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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req->next = NULL;
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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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local_irq_save(flags);
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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)
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macii_start();
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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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/* Start auto-polling */
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static int macii_autopoll(int devs)
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{
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unsigned long flags;
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local_irq_save(flags);
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/* bit 1 == device 1, and so on. */
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autopoll_devs = (unsigned int)devs & 0xFFFE;
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if (!current_req) {
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macii_queue_poll();
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if (current_req && macii_state == idle)
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macii_start();
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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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/* Prod the chip without interrupts */
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static void macii_poll(void)
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{
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macii_interrupt(0, NULL);
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}
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/* Reset the bus */
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static int macii_reset_bus(void)
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{
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struct adb_request req;
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/* Command = 0, Address = ignored */
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adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
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macii_send_request(&req, 1);
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/* Don't want any more requests during the Global Reset low time. */
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udelay(3000);
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return 0;
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}
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/* Start sending ADB packet */
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static void macii_start(void)
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{
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struct adb_request *req;
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req = current_req;
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/* Now send it. Be careful though, that first byte of the request
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* is actually ADB_PACKET; the real data begins at index 1!
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* And req->nbytes is the number of bytes of real data plus one.
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*/
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/* Output mode */
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via[ACR] |= SR_OUT;
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/* Load data */
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via[SR] = req->data[1];
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/* set ADB state to 'command' */
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via[B] = (via[B] & ~ST_MASK) | ST_CMD;
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macii_state = sending;
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data_index = 2;
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bus_timeout = false;
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srq_asserted = false;
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}
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/*
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* The notorious ADB interrupt handler - does all of the protocol handling.
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* Relies on the ADB controller sending and receiving data, thereby
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* generating shift register interrupts (SR_INT) for us. This means there has
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* to be activity on the ADB bus. The chip will poll to achieve this.
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*
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* The VIA Port B output signalling works as follows. After the ADB transceiver
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* sees a transition on the PB4 and PB5 lines it will crank over the VIA shift
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* register which eventually raises the SR_INT interrupt. The PB4/PB5 outputs
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* are toggled with each byte as the ADB transaction progresses.
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*
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* Request with no reply expected (and empty transceiver buffer):
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* CMD -> IDLE
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* Request with expected reply packet (or with buffered autopoll packet):
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* CMD -> EVEN -> ODD -> EVEN -> ... -> IDLE
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* Unsolicited packet:
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* IDLE -> EVEN -> ODD -> EVEN -> ... -> IDLE
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*/
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static irqreturn_t macii_interrupt(int irq, void *arg)
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{
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int x;
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struct adb_request *req;
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unsigned long flags;
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local_irq_save(flags);
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if (!arg) {
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/* Clear the SR IRQ flag when polling. */
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if (via[IFR] & SR_INT)
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via[IFR] = SR_INT;
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else {
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local_irq_restore(flags);
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return IRQ_NONE;
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}
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}
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status = via[B] & (ST_MASK | CTLR_IRQ);
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switch (macii_state) {
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case idle:
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WARN_ON((status & ST_MASK) != ST_IDLE);
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reply_ptr = reply_buf;
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reading_reply = false;
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bus_timeout = false;
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srq_asserted = false;
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x = via[SR];
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if (!(status & CTLR_IRQ)) {
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/* /CTLR_IRQ asserted in idle state means we must
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* read an autopoll reply from the transceiver buffer.
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*/
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macii_state = reading;
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*reply_ptr = x;
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reply_len = 1;
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} else {
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/* bus timeout */
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reply_len = 0;
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break;
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}
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/* set ADB state = even for first data byte */
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via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
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break;
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case sending:
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req = current_req;
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if (status == (ST_CMD | CTLR_IRQ)) {
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/* /CTLR_IRQ de-asserted after the command byte means
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* the host can continue with the transaction.
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*/
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/* Store command byte */
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last_cmd = req->data[1];
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if ((last_cmd & OP_MASK) == TALK) {
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last_talk_cmd = last_cmd;
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if ((last_cmd & CMD_MASK) == ADB_READREG(0, 0))
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last_poll_cmd = last_cmd;
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}
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}
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if (status == ST_CMD) {
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/* /CTLR_IRQ asserted after the command byte means we
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* must read an autopoll reply. The first byte was
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* lost because the shift register was an output.
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*/
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macii_state = reading;
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reading_reply = false;
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reply_ptr = reply_buf;
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*reply_ptr = last_talk_cmd;
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reply_len = 1;
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/* reset to shift in */
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via[ACR] &= ~SR_OUT;
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x = via[SR];
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} else if (data_index >= req->nbytes) {
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req->sent = 1;
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if (req->reply_expected) {
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macii_state = reading;
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reading_reply = true;
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reply_ptr = req->reply;
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*reply_ptr = req->data[1];
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reply_len = 1;
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via[ACR] &= ~SR_OUT;
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x = via[SR];
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} else if ((req->data[1] & OP_MASK) == TALK) {
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macii_state = reading;
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reading_reply = false;
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reply_ptr = reply_buf;
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*reply_ptr = req->data[1];
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reply_len = 1;
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via[ACR] &= ~SR_OUT;
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x = via[SR];
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req->complete = 1;
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current_req = req->next;
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if (req->done)
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(*req->done)(req);
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} else {
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macii_state = idle;
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req->complete = 1;
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current_req = req->next;
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if (req->done)
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(*req->done)(req);
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break;
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}
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} else {
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via[SR] = req->data[data_index++];
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}
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if ((via[B] & ST_MASK) == ST_CMD) {
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/* just sent the command byte, set to EVEN */
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via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
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} else {
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/* invert state bits, toggle ODD/EVEN */
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via[B] ^= ST_MASK;
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}
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break;
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case reading:
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x = via[SR];
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WARN_ON((status & ST_MASK) == ST_CMD ||
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(status & ST_MASK) == ST_IDLE);
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if (!(status & CTLR_IRQ)) {
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if (status == ST_EVEN && reply_len == 1) {
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bus_timeout = true;
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} else if (status == ST_ODD && reply_len == 2) {
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srq_asserted = true;
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} else {
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macii_state = idle;
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if (bus_timeout)
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reply_len = 0;
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if (reading_reply) {
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struct adb_request *req = current_req;
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|
req->reply_len = reply_len;
|
|
|
|
req->complete = 1;
|
|
current_req = req->next;
|
|
if (req->done)
|
|
(*req->done)(req);
|
|
} else if (reply_len && autopoll_devs &&
|
|
reply_buf[0] == last_poll_cmd) {
|
|
adb_input(reply_buf, reply_len, 1);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (reply_len < ARRAY_SIZE(reply_buf)) {
|
|
reply_ptr++;
|
|
*reply_ptr = x;
|
|
reply_len++;
|
|
}
|
|
|
|
/* invert state bits, toggle ODD/EVEN */
|
|
via[B] ^= ST_MASK;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (macii_state == idle) {
|
|
if (!current_req)
|
|
macii_queue_poll();
|
|
|
|
if (current_req)
|
|
macii_start();
|
|
|
|
if (macii_state == idle) {
|
|
via[ACR] &= ~SR_OUT;
|
|
x = via[SR];
|
|
via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
|
|
}
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
return IRQ_HANDLED;
|
|
}
|