diff options
Diffstat (limited to 'drivers/macintosh')
| -rw-r--r-- | drivers/macintosh/Kconfig | 24 | ||||
| -rw-r--r-- | drivers/macintosh/Makefile | 1 | ||||
| -rw-r--r-- | drivers/macintosh/adb.c | 4 | ||||
| -rw-r--r-- | drivers/macintosh/via-cuda.c | 294 | ||||
| -rw-r--r-- | drivers/macintosh/via-maciisi.c | 677 |
5 files changed, 217 insertions, 783 deletions
diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig index 5d80810934df..97a420c11eed 100644 --- a/drivers/macintosh/Kconfig +++ b/drivers/macintosh/Kconfig @@ -30,14 +30,6 @@ config ADB_MACII Quadra 610, Quadra 650, Quadra 700, Quadra 800, Centris 610 and Centris 650. -config ADB_MACIISI - bool "Include Mac IIsi ADB driver" - depends on ADB && MAC && BROKEN - help - Say Y here if want your kernel to support Macintosh systems that use - the Mac IIsi style ADB. This includes the IIsi, IIvi, IIvx, Classic - II, LC, LC II, LC III, Performa 460, and the Performa 600. - config ADB_IOP bool "Include IOP (IIfx/Quadra 9x0) ADB driver" depends on ADB && MAC @@ -60,17 +52,15 @@ config ADB_PMU68K # we want to change this to something like CONFIG_SYSCTRL_CUDA/PMU config ADB_CUDA - bool "Support for CUDA based Macs and PowerMacs" + bool "Support for Cuda/Egret based Macs and PowerMacs" depends on (ADB || PPC_PMAC) && !PPC_PMAC64 help - This provides support for CUDA based Macintosh and Power Macintosh - systems. This includes many m68k based Macs (Color Classic, Mac TV, - Performa 475, Performa 520, Performa 550, Performa 575, - Performa 588, Quadra 605, Quadra 630, Quadra/Centris 660AV, and - Quadra 840AV), most OldWorld PowerMacs, the first generation iMacs, - the Blue&White G3 and the "Yikes" G4 (PCI Graphics). All later - models should use CONFIG_ADB_PMU instead. It is safe to say Y here - even if your machine doesn't have a CUDA. + This provides support for Cuda/Egret based Macintosh and + Power Macintosh systems. This includes most m68k based Macs, + most Old World PowerMacs, the first generation iMacs, the + Blue & White G3 and the "Yikes" G4 (PCI Graphics). All later + models should use CONFIG_ADB_PMU instead. It is safe to say Y + here even if your machine doesn't have a Cuda or Egret device. If unsure say Y. diff --git a/drivers/macintosh/Makefile b/drivers/macintosh/Makefile index 383ba920085b..516eb65bcacc 100644 --- a/drivers/macintosh/Makefile +++ b/drivers/macintosh/Makefile @@ -20,7 +20,6 @@ obj-$(CONFIG_PMAC_SMU) += smu.o obj-$(CONFIG_ADB) += adb.o obj-$(CONFIG_ADB_MACII) += via-macii.o -obj-$(CONFIG_ADB_MACIISI) += via-maciisi.o obj-$(CONFIG_ADB_IOP) += adb-iop.o obj-$(CONFIG_ADB_PMU68K) += via-pmu68k.o obj-$(CONFIG_ADB_MACIO) += macio-adb.o diff --git a/drivers/macintosh/adb.c b/drivers/macintosh/adb.c index 226179b975a0..152414e6378a 100644 --- a/drivers/macintosh/adb.c +++ b/drivers/macintosh/adb.c @@ -48,7 +48,6 @@ EXPORT_SYMBOL(adb_client_list); extern struct adb_driver via_macii_driver; -extern struct adb_driver via_maciisi_driver; extern struct adb_driver via_cuda_driver; extern struct adb_driver adb_iop_driver; extern struct adb_driver via_pmu_driver; @@ -59,9 +58,6 @@ static struct adb_driver *adb_driver_list[] = { #ifdef CONFIG_ADB_MACII &via_macii_driver, #endif -#ifdef CONFIG_ADB_MACIISI - &via_maciisi_driver, -#endif #ifdef CONFIG_ADB_CUDA &via_cuda_driver, #endif diff --git a/drivers/macintosh/via-cuda.c b/drivers/macintosh/via-cuda.c index 2088e23a8002..c60415958dfe 100644 --- a/drivers/macintosh/via-cuda.c +++ b/drivers/macintosh/via-cuda.c @@ -1,10 +1,10 @@ /* - * Device driver for the via-cuda on Apple Powermacs. + * Device driver for the Cuda and Egret system controllers found on PowerMacs + * and 68k Macs. * - * The VIA (versatile interface adapter) interfaces to the CUDA, - * a 6805 microprocessor core which controls the ADB (Apple Desktop - * Bus) which connects to the keyboard and mouse. The CUDA also - * controls system power and the RTC (real time clock) chip. + * The Cuda or Egret is a 6805 microcontroller interfaced to the 6522 VIA. + * This MCU controls system power, Parameter RAM, Real Time Clock and the + * Apple Desktop Bus (ADB) that connects to the keyboard and mouse. * * Copyright (C) 1996 Paul Mackerras. */ @@ -50,10 +50,27 @@ static DEFINE_SPINLOCK(cuda_lock); #define IER (14*RS) /* Interrupt enable register */ #define ANH (15*RS) /* A-side data, no handshake */ -/* Bits in B data register: all active low */ -#define TREQ 0x08 /* Transfer request (input) */ -#define TACK 0x10 /* Transfer acknowledge (output) */ -#define TIP 0x20 /* Transfer in progress (output) */ +/* + * When the Cuda design replaced the Egret, some signal names and + * logic sense changed. They all serve the same purposes, however. + * + * VIA pin | Egret pin + * ----------------+------------------------------------------ + * PB3 (input) | Transceiver session (active low) + * PB4 (output) | VIA full (active high) + * PB5 (output) | System session (active high) + * + * VIA pin | Cuda pin + * ----------------+------------------------------------------ + * PB3 (input) | Transfer request (active low) + * PB4 (output) | Byte acknowledge (active low) + * PB5 (output) | Transfer in progress (active low) + */ + +/* Bits in Port B data register */ +#define TREQ 0x08 /* Transfer request */ +#define TACK 0x10 /* Transfer acknowledge */ +#define TIP 0x20 /* Transfer in progress */ /* Bits in ACR */ #define SR_CTRL 0x1c /* Shift register control bits */ @@ -65,6 +82,74 @@ static DEFINE_SPINLOCK(cuda_lock); #define IER_CLR 0 /* clear bits in IER */ #define SR_INT 0x04 /* Shift register full/empty */ +/* Duration of byte acknowledgement pulse (us) */ +#define EGRET_TACK_ASSERTED_DELAY 300 +#define EGRET_TACK_NEGATED_DELAY 400 + +/* Interval from interrupt to start of session (us) */ +#define EGRET_SESSION_DELAY 450 + +#ifdef CONFIG_PPC +#define mcu_is_egret false +#else +static bool mcu_is_egret; +#endif + +static inline bool TREQ_asserted(u8 portb) +{ + return !(portb & TREQ); +} + +static inline void assert_TIP(void) +{ + if (mcu_is_egret) { + udelay(EGRET_SESSION_DELAY); + out_8(&via[B], in_8(&via[B]) | TIP); + } else + out_8(&via[B], in_8(&via[B]) & ~TIP); +} + +static inline void assert_TIP_and_TACK(void) +{ + if (mcu_is_egret) { + udelay(EGRET_SESSION_DELAY); + out_8(&via[B], in_8(&via[B]) | TIP | TACK); + } else + out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK)); +} + +static inline void assert_TACK(void) +{ + if (mcu_is_egret) { + udelay(EGRET_TACK_NEGATED_DELAY); + out_8(&via[B], in_8(&via[B]) | TACK); + } else + out_8(&via[B], in_8(&via[B]) & ~TACK); +} + +static inline void toggle_TACK(void) +{ + out_8(&via[B], in_8(&via[B]) ^ TACK); +} + +static inline void negate_TACK(void) +{ + if (mcu_is_egret) { + udelay(EGRET_TACK_ASSERTED_DELAY); + out_8(&via[B], in_8(&via[B]) & ~TACK); + } else + out_8(&via[B], in_8(&via[B]) | TACK); +} + +static inline void negate_TIP_and_TACK(void) +{ + if (mcu_is_egret) { + udelay(EGRET_TACK_ASSERTED_DELAY); + out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK)); + } else + out_8(&via[B], in_8(&via[B]) | TIP | TACK); +} + static enum cuda_state { idle, sent_first_byte, @@ -120,11 +205,13 @@ int __init find_via_cuda(void) struct adb_request req; int err; - if (macintosh_config->adb_type != MAC_ADB_CUDA) + if (macintosh_config->adb_type != MAC_ADB_CUDA && + macintosh_config->adb_type != MAC_ADB_EGRET) return 0; via = via1; cuda_state = idle; + mcu_is_egret = macintosh_config->adb_type == MAC_ADB_EGRET; err = cuda_init_via(); if (err) { @@ -221,7 +308,7 @@ static int __init via_cuda_start(void) return -EAGAIN; } - printk("Macintosh CUDA driver v0.5 for Unified ADB.\n"); + pr_info("Macintosh Cuda and Egret driver.\n"); cuda_fully_inited = 1; return 0; @@ -237,7 +324,8 @@ cuda_probe(void) if (sys_ctrler != SYS_CTRLER_CUDA) return -ENODEV; #else - if (macintosh_config->adb_type != MAC_ADB_CUDA) + if (macintosh_config->adb_type != MAC_ADB_CUDA && + macintosh_config->adb_type != MAC_ADB_EGRET) return -ENODEV; #endif if (via == NULL) @@ -246,12 +334,39 @@ cuda_probe(void) } #endif /* CONFIG_ADB */ +static int __init sync_egret(void) +{ + if (TREQ_asserted(in_8(&via[B]))) { + /* Complete the inbound transfer */ + assert_TIP_and_TACK(); + while (1) { + negate_TACK(); + mdelay(1); + (void)in_8(&via[SR]); + assert_TACK(); + if (!TREQ_asserted(in_8(&via[B]))) + break; + } + negate_TIP_and_TACK(); + } else if (in_8(&via[B]) & TIP) { + /* Terminate the outbound transfer */ + negate_TACK(); + assert_TACK(); + mdelay(1); + negate_TIP_and_TACK(); + } + /* Clear shift register interrupt */ + if (in_8(&via[IFR]) & SR_INT) + (void)in_8(&via[SR]); + return 0; +} + #define WAIT_FOR(cond, what) \ do { \ int x; \ for (x = 1000; !(cond); --x) { \ if (x == 0) { \ - printk("Timeout waiting for " what "\n"); \ + pr_err("Timeout waiting for " what "\n"); \ return -ENXIO; \ } \ udelay(100); \ @@ -261,10 +376,6 @@ cuda_probe(void) static int __init cuda_init_via(void) { - out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */ - out_8(&via[B], in_8(&via[B]) | TACK | TIP); /* negate them */ - out_8(&via[ACR] ,(in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT); /* SR data in */ - (void)in_8(&via[SR]); /* clear any left-over data */ #ifdef CONFIG_PPC out_8(&via[IER], 0x7f); /* disable interrupts from VIA */ (void)in_8(&via[IER]); @@ -272,16 +383,25 @@ __init cuda_init_via(void) out_8(&via[IER], SR_INT); /* disable SR interrupt from VIA */ #endif + out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */ + out_8(&via[ACR], (in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT); /* SR data in */ + (void)in_8(&via[SR]); /* clear any left-over data */ + + if (mcu_is_egret) + return sync_egret(); + + negate_TIP_and_TACK(); + /* delay 4ms and then clear any pending interrupt */ mdelay(4); (void)in_8(&via[SR]); out_8(&via[IFR], SR_INT); /* sync with the CUDA - assert TACK without TIP */ - out_8(&via[B], in_8(&via[B]) & ~TACK); + assert_TACK(); /* wait for the CUDA to assert TREQ in response */ - WAIT_FOR((in_8(&via[B]) & TREQ) == 0, "CUDA response to sync"); + WAIT_FOR(TREQ_asserted(in_8(&via[B])), "CUDA response to sync"); /* wait for the interrupt and then clear it */ WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)"); @@ -289,14 +409,13 @@ __init cuda_init_via(void) out_8(&via[IFR], SR_INT); /* finish the sync by negating TACK */ - out_8(&via[B], in_8(&via[B]) | TACK); + negate_TACK(); /* wait for the CUDA to negate TREQ and the corresponding interrupt */ - WAIT_FOR(in_8(&via[B]) & TREQ, "CUDA response to sync (3)"); + WAIT_FOR(!TREQ_asserted(in_8(&via[B])), "CUDA response to sync (3)"); WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)"); (void)in_8(&via[SR]); out_8(&via[IFR], SR_INT); - out_8(&via[B], in_8(&via[B]) | TIP); /* should be unnecessary */ return 0; } @@ -357,6 +476,7 @@ cuda_reset_adb_bus(void) return 0; } #endif /* CONFIG_ADB */ + /* Construct and send a cuda request */ int cuda_request(struct adb_request *req, void (*done)(struct adb_request *), @@ -413,47 +533,43 @@ cuda_write(struct adb_request *req) static void cuda_start(void) { - struct adb_request *req; - /* assert cuda_state == idle */ - /* get the packet to send */ - req = current_req; - if (req == 0) + if (current_req == NULL) return; - if ((in_8(&via[B]) & TREQ) == 0) + data_index = 0; + if (TREQ_asserted(in_8(&via[B]))) return; /* a byte is coming in from the CUDA */ /* set the shift register to shift out and send a byte */ out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT); - out_8(&via[SR], req->data[0]); - out_8(&via[B], in_8(&via[B]) & ~TIP); + out_8(&via[SR], current_req->data[data_index++]); + if (mcu_is_egret) + assert_TIP_and_TACK(); + else + assert_TIP(); cuda_state = sent_first_byte; } void cuda_poll(void) { - /* cuda_interrupt only takes a normal lock, we disable - * interrupts here to avoid re-entering and thus deadlocking. - */ - if (cuda_irq) - disable_irq(cuda_irq); - cuda_interrupt(0, NULL); - if (cuda_irq) - enable_irq(cuda_irq); + cuda_interrupt(0, NULL); } EXPORT_SYMBOL(cuda_poll); +#define ARRAY_FULL(a, p) ((p) - (a) == ARRAY_SIZE(a)) + static irqreturn_t cuda_interrupt(int irq, void *arg) { - int status; + unsigned long flags; + u8 status; struct adb_request *req = NULL; unsigned char ibuf[16]; int ibuf_len = 0; int complete = 0; - spin_lock(&cuda_lock); + spin_lock_irqsave(&cuda_lock, flags); /* On powermacs, this handler is registered for the VIA IRQ. But they use * just the shift register IRQ -- other VIA interrupt sources are disabled. @@ -466,52 +582,50 @@ cuda_interrupt(int irq, void *arg) #endif { if ((in_8(&via[IFR]) & SR_INT) == 0) { - spin_unlock(&cuda_lock); + spin_unlock_irqrestore(&cuda_lock, flags); return IRQ_NONE; } else { out_8(&via[IFR], SR_INT); } } - - status = (~in_8(&via[B]) & (TIP|TREQ)) | (in_8(&via[ACR]) & SR_OUT); - /* printk("cuda_interrupt: state=%d status=%x\n", cuda_state, status); */ + + status = in_8(&via[B]) & (TIP | TACK | TREQ); + switch (cuda_state) { case idle: - /* CUDA has sent us the first byte of data - unsolicited */ - if (status != TREQ) - printk("cuda: state=idle, status=%x\n", status); + /* System controller has unsolicited data for us */ (void)in_8(&via[SR]); - out_8(&via[B], in_8(&via[B]) & ~TIP); +idle_state: + assert_TIP(); cuda_state = reading; reply_ptr = cuda_rbuf; reading_reply = 0; break; case awaiting_reply: - /* CUDA has sent us the first byte of data of a reply */ - if (status != TREQ) - printk("cuda: state=awaiting_reply, status=%x\n", status); + /* System controller has reply data for us */ (void)in_8(&via[SR]); - out_8(&via[B], in_8(&via[B]) & ~TIP); + assert_TIP(); cuda_state = reading; reply_ptr = current_req->reply; reading_reply = 1; break; case sent_first_byte: - if (status == TREQ + TIP + SR_OUT) { + if (TREQ_asserted(status)) { /* collision */ out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT); (void)in_8(&via[SR]); - out_8(&via[B], in_8(&via[B]) | TIP | TACK); + negate_TIP_and_TACK(); cuda_state = idle; + /* Egret does not raise an "aborted" interrupt */ + if (mcu_is_egret) + goto idle_state; } else { - /* assert status == TIP + SR_OUT */ - if (status != TIP + SR_OUT) - printk("cuda: state=sent_first_byte status=%x\n", status); - out_8(&via[SR], current_req->data[1]); - out_8(&via[B], in_8(&via[B]) ^ TACK); - data_index = 2; + out_8(&via[SR], current_req->data[data_index++]); + toggle_TACK(); + if (mcu_is_egret) + assert_TACK(); cuda_state = sending; } break; @@ -521,7 +635,7 @@ cuda_interrupt(int irq, void *arg) if (data_index >= req->nbytes) { out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT); (void)in_8(&via[SR]); - out_8(&via[B], in_8(&via[B]) | TACK | TIP); + negate_TIP_and_TACK(); req->sent = 1; if (req->reply_expected) { cuda_state = awaiting_reply; @@ -534,26 +648,37 @@ cuda_interrupt(int irq, void *arg) } } else { out_8(&via[SR], req->data[data_index++]); - out_8(&via[B], in_8(&via[B]) ^ TACK); + toggle_TACK(); + if (mcu_is_egret) + assert_TACK(); } break; case reading: - *reply_ptr++ = in_8(&via[SR]); - if (status == TIP) { + if (reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr) + : ARRAY_FULL(cuda_rbuf, reply_ptr)) + (void)in_8(&via[SR]); + else + *reply_ptr++ = in_8(&via[SR]); + if (!TREQ_asserted(status)) { + if (mcu_is_egret) + assert_TACK(); /* that's all folks */ - out_8(&via[B], in_8(&via[B]) | TACK | TIP); + negate_TIP_and_TACK(); cuda_state = read_done; + /* Egret does not raise a "read done" interrupt */ + if (mcu_is_egret) + goto read_done_state; } else { - /* assert status == TIP | TREQ */ - if (status != TIP + TREQ) - printk("cuda: state=reading status=%x\n", status); - out_8(&via[B], in_8(&via[B]) ^ TACK); + toggle_TACK(); + if (mcu_is_egret) + negate_TACK(); } break; case read_done: (void)in_8(&via[SR]); +read_done_state: if (reading_reply) { req = current_req; req->reply_len = reply_ptr - req->reply; @@ -570,6 +695,7 @@ cuda_interrupt(int irq, void *arg) } current_req = req->next; complete = 1; + reading_reply = 0; } else { /* This is tricky. We must break the spinlock to call * cuda_input. However, doing so means we might get @@ -581,21 +707,19 @@ cuda_interrupt(int irq, void *arg) ibuf_len = reply_ptr - cuda_rbuf; memcpy(ibuf, cuda_rbuf, ibuf_len); } - if (status == TREQ) { - out_8(&via[B], in_8(&via[B]) & ~TIP); + reply_ptr = cuda_rbuf; + cuda_state = idle; + cuda_start(); + if (cuda_state == idle && TREQ_asserted(in_8(&via[B]))) { + assert_TIP(); cuda_state = reading; - reply_ptr = cuda_rbuf; - reading_reply = 0; - } else { - cuda_state = idle; - cuda_start(); } break; default: - printk("cuda_interrupt: unknown cuda_state %d?\n", cuda_state); + pr_err("cuda_interrupt: unknown cuda_state %d?\n", cuda_state); } - spin_unlock(&cuda_lock); + spin_unlock_irqrestore(&cuda_lock, flags); if (complete && req) { void (*done)(struct adb_request *) = req->done; mb(); @@ -614,8 +738,6 @@ cuda_interrupt(int irq, void *arg) static void cuda_input(unsigned char *buf, int nb) { - int i; - switch (buf[0]) { case ADB_PACKET: #ifdef CONFIG_XMON @@ -632,10 +754,14 @@ cuda_input(unsigned char *buf, int nb) #endif /* CONFIG_ADB */ break; + case TIMER_PACKET: + /* Egret sends these periodically. Might be useful as a 'heartbeat' + * to trigger a recovery for the VIA shift register errata. + */ + break; + default: - printk("data from cuda (%d bytes):", nb); - for (i = 0; i < nb; ++i) - printk(" %.2x", buf[i]); - printk("\n"); + print_hex_dump(KERN_INFO, "cuda_input: ", DUMP_PREFIX_NONE, 32, 1, + buf, nb, false); } } diff --git a/drivers/macintosh/via-maciisi.c b/drivers/macintosh/via-maciisi.c deleted file mode 100644 index 34d02a91b29f..000000000000 --- a/drivers/macintosh/via-maciisi.c +++ /dev/null @@ -1,677 +0,0 @@ -/* - * Device driver for the IIsi-style ADB on some Mac LC and II-class machines - * - * Based on via-cuda.c and via-macii.c, as well as the original - * adb-bus.c, which in turn is somewhat influenced by (but uses no - * code from) the NetBSD HWDIRECT ADB code. Original IIsi driver work - * was done by Robert Thompson and integrated into the old style - * driver by Michael Schmitz. - * - * Original sources (c) Alan Cox, Paul Mackerras, and others. - * - * Rewritten for Unified ADB by David Huggins-Daines <dhd@debian.org> - * - * 7/13/2000- extensive changes by Andrew McPherson <andrew@macduff.dhs.org> - * Works about 30% of the time now. - */ - -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/adb.h> -#include <linux/cuda.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <asm/macintosh.h> -#include <asm/macints.h> -#include <asm/mac_via.h> - -static volatile unsigned char *via; - -/* VIA registers - spaced 0x200 bytes apart - only the ones we actually use */ -#define RS 0x200 /* skip between registers */ -#define B 0 /* B-side data */ -#define A RS /* A-side data */ -#define DIRB (2*RS) /* B-side direction (1=output) */ -#define DIRA (3*RS) /* A-side direction (1=output) */ -#define SR (10*RS) /* Shift register */ -#define ACR (11*RS) /* Auxiliary control register */ -#define IFR (13*RS) /* Interrupt flag register */ -#define IER (14*RS) /* Interrupt enable register */ - -/* Bits in B data register: all active low */ -#define TREQ 0x08 /* Transfer request (input) */ -#define TACK 0x10 /* Transfer acknowledge (output) */ -#define TIP 0x20 /* Transfer in progress (output) */ -#define ST_MASK 0x30 /* mask for selecting ADB state bits */ - -/* Bits in ACR */ -#define SR_CTRL 0x1c /* Shift register control bits */ -#define SR_EXT 0x0c /* Shift on external clock */ -#define SR_OUT 0x10 /* Shift out if 1 */ - -/* Bits in IFR and IER */ -#define IER_SET 0x80 /* set bits in IER */ -#define IER_CLR 0 /* clear bits in IER */ -#define SR_INT 0x04 /* Shift register full/empty */ -#define SR_DATA 0x08 /* Shift register data */ -#define SR_CLOCK 0x10 /* Shift register clock */ - -#define ADB_DELAY 150 - -#undef DEBUG_MACIISI_ADB - -static struct adb_request* current_req; -static struct adb_request* last_req; -static unsigned char maciisi_rbuf[16]; -static unsigned char *reply_ptr; -static int data_index; -static int reading_reply; -static int reply_len; -static int tmp; -static int need_sync; - -static enum maciisi_state { - idle, - sending, - reading, -} maciisi_state; - -static int maciisi_probe(void); -static int maciisi_init(void); -static int maciisi_send_request(struct adb_request* req, int sync); -static void maciisi_sync(struct adb_request *req); -static int maciisi_write(struct adb_request* req); -static irqreturn_t maciisi_interrupt(int irq, void* arg); -static void maciisi_input(unsigned char *buf, int nb); -static int maciisi_init_via(void); -static void maciisi_poll(void); -static int maciisi_start(void); - -struct adb_driver via_maciisi_driver = { - "Mac IIsi", - maciisi_probe, - maciisi_init, - maciisi_send_request, - NULL, /* maciisi_adb_autopoll, */ - maciisi_poll, - NULL /* maciisi_reset_adb_bus */ -}; - -static int -maciisi_probe(void) -{ - if (macintosh_config->adb_type != MAC_ADB_IISI) - return -ENODEV; - - via = via1; - return 0; -} - -static int -maciisi_init(void) -{ - int err; - - if (via == NULL) - return -ENODEV; - - if ((err = maciisi_init_via())) { - printk(KERN_ERR "maciisi_init: maciisi_init_via() failed, code %d\n", err); - via = NULL; - return err; - } - - if (request_irq(IRQ_MAC_ADB, maciisi_interrupt, 0, "ADB", - maciisi_interrupt)) { - printk(KERN_ERR "maciisi_init: can't get irq %d\n", IRQ_MAC_ADB); - return -EAGAIN; - } - - printk("adb: Mac IIsi driver v0.2 for Unified ADB.\n"); - return 0; -} - -/* Flush data from the ADB controller */ -static void -maciisi_stfu(void) -{ - int status = via[B] & (TIP|TREQ); - - if (status & TREQ) { -#ifdef DEBUG_MACIISI_ADB - printk (KERN_DEBUG "maciisi_stfu called with TREQ high!\n"); -#endif - return; - } - - udelay(ADB_DELAY); - via[ACR] &= ~SR_OUT; - via[IER] = IER_CLR | SR_INT; - - udelay(ADB_DELAY); - - status = via[B] & (TIP|TREQ); - - if (!(status & TREQ)) - { - via[B] |= TIP; - - while(1) - { - int poll_timeout = ADB_DELAY * 5; - /* Poll for SR interrupt */ - while (!(via[IFR] & SR_INT) && poll_timeout-- > 0) - status = via[B] & (TIP|TREQ); - - tmp = via[SR]; /* Clear shift register */ -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "maciisi_stfu: status %x timeout %d data %x\n", - status, poll_timeout, tmp); -#endif - if(via[B] & TREQ) - break; - - /* ACK on-off */ - via[B] |= TACK; - udelay(ADB_DELAY); - via[B] &= ~TACK; - } - - /* end frame */ - via[B] &= ~TIP; - udelay(ADB_DELAY); - } - - via[IER] = IER_SET | SR_INT; -} - -/* All specifically VIA-related initialization goes here */ -static int -maciisi_init_via(void) -{ - int i; - - /* Set the lines up. We want TREQ as input TACK|TIP as output */ - via[DIRB] = (via[DIRB] | TACK | TIP) & ~TREQ; - /* Shift register on input */ - via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT; -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "maciisi_init_via: initial status %x\n", via[B] & (TIP|TREQ)); -#endif - /* Wipe any pending data and int */ - tmp = via[SR]; - /* Enable keyboard interrupts */ - via[IER] = IER_SET | SR_INT; - /* Set initial state: idle */ - via[B] &= ~(TACK|TIP); - /* Clear interrupt bit */ - via[IFR] = SR_INT; - - for(i = 0; i < 60; i++) { - udelay(ADB_DELAY); - maciisi_stfu(); - udelay(ADB_DELAY); - if(via[B] & TREQ) - break; - } - if (i == 60) - printk(KERN_ERR "maciisi_init_via: bus jam?\n"); - - maciisi_state = idle; - need_sync = 0; - - return 0; -} - -/* Send a request, possibly waiting for a reply */ -static int -maciisi_send_request(struct adb_request* req, int sync) -{ - int i; - -#ifdef DEBUG_MACIISI_ADB - static int dump_packet = 0; -#endif - - if (via == NULL) { - req->complete = 1; - return -ENXIO; - } - -#ifdef DEBUG_MACIISI_ADB - if (dump_packet) { - printk(KERN_DEBUG "maciisi_send_request:"); - for (i = 0; i < req->nbytes; i++) { - printk(" %.2x", req->data[i]); - } - printk(" sync %d\n", sync); - } -#endif - - req->reply_expected = 1; - - i = maciisi_write(req); - if (i) - { - /* Normally, if a packet requires syncing, that happens at the end of - * maciisi_send_request. But if the transfer fails, it will be restarted - * by maciisi_interrupt(). We use need_sync to tell maciisi_interrupt - * when to sync a packet that it sends out. - * - * Suggestions on a better way to do this are welcome. - */ - if(i == -EBUSY && sync) - need_sync = 1; - else - need_sync = 0; - return i; - } - if(sync) - maciisi_sync(req); - - return 0; -} - -/* Poll the ADB chip until the request completes */ -static void maciisi_sync(struct adb_request *req) -{ - int count = 0; - -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "maciisi_sync called\n"); -#endif - - /* If for some reason the ADB chip shuts up on us, we want to avoid an endless loop. */ - while (!req->complete && count++ < 50) { - maciisi_poll(); - } - /* This could be BAD... when the ADB controller doesn't respond - * for this long, it's probably not coming back :-( */ - if (count > 50) /* Hopefully shouldn't happen */ - printk(KERN_ERR "maciisi_send_request: poll timed out!\n"); -} - -int -maciisi_request(struct adb_request *req, void (*done)(struct adb_request *), - int nbytes, ...) -{ - va_list list; - int i; - - req->nbytes = nbytes; - req->done = done; - req->reply_expected = 0; - va_start(list, nbytes); - for (i = 0; i < nbytes; i++) - req->data[i++] = va_arg(list, int); - va_end(list); - - return maciisi_send_request(req, 1); -} - -/* Enqueue a request, and run the queue if possible */ -static int -maciisi_write(struct adb_request* req) -{ - unsigned long flags; - int i; - - /* We will accept CUDA packets - the VIA sends them to us, so - it figures that we should be able to send them to it */ - if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) { - printk(KERN_ERR "maciisi_write: packet too small or not an ADB or CUDA packet\n"); - req->complete = 1; - return -EINVAL; - } - req->next = NULL; - req->sent = 0; - req->complete = 0; - req->reply_len = 0; - - local_irq_save(flags); - - if (current_req) { - last_req->next = req; - last_req = req; - } else { - current_req = req; - last_req = req; - } - if (maciisi_state == idle) - { - i = maciisi_start(); - if(i != 0) - { - local_irq_restore(flags); - return i; - } - } - else - { -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "maciisi_write: would start, but state is %d\n", maciisi_state); -#endif - local_irq_restore(flags); - return -EBUSY; - } - - local_irq_restore(flags); - - return 0; -} - -static int -maciisi_start(void) -{ - struct adb_request* req; - int status; - -#ifdef DEBUG_MACIISI_ADB - status = via[B] & (TIP | TREQ); - - printk(KERN_DEBUG "maciisi_start called, state=%d, status=%x, ifr=%x\n", maciisi_state, status, via[IFR]); -#endif - - if (maciisi_state != idle) { - /* shouldn't happen */ - printk(KERN_ERR "maciisi_start: maciisi_start called when driver busy!\n"); - return -EBUSY; - } - - req = current_req; - if (req == NULL) - return -EINVAL; - - status = via[B] & (TIP|TREQ); - if (!(status & TREQ)) { -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "maciisi_start: bus busy - aborting\n"); -#endif - return -EBUSY; - } - - /* Okay, send */ -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "maciisi_start: sending\n"); -#endif - /* Set state to active */ - via[B] |= TIP; - /* ACK off */ - via[B] &= ~TACK; - /* Delay */ - udelay(ADB_DELAY); - /* Shift out and send */ - via[ACR] |= SR_OUT; - via[SR] = req->data[0]; - data_index = 1; - /* ACK on */ - via[B] |= TACK; - maciisi_state = sending; - - return 0; -} - -void -maciisi_poll(void) -{ - unsigned long flags; - - local_irq_save(flags); - if (via[IFR] & SR_INT) { - maciisi_interrupt(0, NULL); - } - else /* avoid calling this function too quickly in a loop */ - udelay(ADB_DELAY); - - local_irq_restore(flags); -} - -/* Shift register interrupt - this is *supposed* to mean that the - register is either full or empty. In practice, I have no idea what - it means :( */ -static irqreturn_t -maciisi_interrupt(int irq, void* arg) -{ - int status; - struct adb_request *req; -#ifdef DEBUG_MACIISI_ADB - static int dump_reply = 0; -#endif - int i; - unsigned long flags; - - local_irq_save(flags); - - status = via[B] & (TIP|TREQ); -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "state %d status %x ifr %x\n", maciisi_state, status, via[IFR]); -#endif - - if (!(via[IFR] & SR_INT)) { - /* Shouldn't happen, we hope */ - printk(KERN_ERR "maciisi_interrupt: called without interrupt flag set\n"); - local_irq_restore(flags); - return IRQ_NONE; - } - - /* Clear the interrupt */ - /* via[IFR] = SR_INT; */ - - switch_start: - switch (maciisi_state) { - case idle: - if (status & TIP) - printk(KERN_ERR "maciisi_interrupt: state is idle but TIP asserted!\n"); - - if(!reading_reply) - udelay(ADB_DELAY); - /* Shift in */ - via[ACR] &= ~SR_OUT; - /* Signal start of frame */ - via[B] |= TIP; - /* Clear the interrupt (throw this value on the floor, it's useless) */ - tmp = via[SR]; - /* ACK adb chip, high-low */ - via[B] |= TACK; - udelay(ADB_DELAY); - via[B] &= ~TACK; - reply_len = 0; - maciisi_state = reading; - if (reading_reply) { - reply_ptr = current_req->reply; - } else { - reply_ptr = maciisi_rbuf; - } - break; - - case sending: - /* via[SR]; */ - /* Set ACK off */ - via[B] &= ~TACK; - req = current_req; - - if (!(status & TREQ)) { - /* collision */ - printk(KERN_ERR "maciisi_interrupt: send collision\n"); - /* Set idle and input */ - via[ACR] &= ~SR_OUT; - tmp = via[SR]; - via[B] &= ~TIP; - /* Must re-send */ - reading_reply = 0; - reply_len = 0; - maciisi_state = idle; - udelay(ADB_DELAY); - /* process this now, because the IFR has been cleared */ - goto switch_start; - } - - udelay(ADB_DELAY); - - if (data_index >= req->nbytes) { - /* Sent the whole packet, put the bus back in idle state */ - /* Shift in, we are about to read a reply (hopefully) */ - via[ACR] &= ~SR_OUT; - tmp = via[SR]; - /* End of frame */ - via[B] &= ~TIP; - req->sent = 1; - maciisi_state = idle; - if (req->reply_expected) { - /* Note: only set this once we've - successfully sent the packet */ - reading_reply = 1; - } else { - current_req = req->next; - if (req->done) - (*req->done)(req); - /* Do any queued requests now */ - i = maciisi_start(); - if(i == 0 && need_sync) { - /* Packet needs to be synced */ - maciisi_sync(current_req); - } - if(i != -EBUSY) - need_sync = 0; - } - } else { - /* Sending more stuff */ - /* Shift out */ - via[ACR] |= SR_OUT; - /* Write */ - via[SR] = req->data[data_index++]; - /* Signal 'byte ready' */ - via[B] |= TACK; - } - break; - - case reading: - /* Shift in */ - /* via[ACR] &= ~SR_OUT; */ /* Not in 2.2 */ - if (reply_len++ > 16) { - printk(KERN_ERR "maciisi_interrupt: reply too long, aborting read\n"); - via[B] |= TACK; - udelay(ADB_DELAY); - via[B] &= ~(TACK|TIP); - maciisi_state = idle; - i = maciisi_start(); - if(i == 0 && need_sync) { - /* Packet needs to be synced */ - maciisi_sync(current_req); - } - if(i != -EBUSY) - need_sync = 0; - break; - } - /* Read data */ - *reply_ptr++ = via[SR]; - status = via[B] & (TIP|TREQ); - /* ACK on/off */ - via[B] |= TACK; - udelay(ADB_DELAY); - via[B] &= ~TACK; - if (!(status & TREQ)) - break; /* more stuff to deal with */ - - /* end of frame */ - via[B] &= ~TIP; - tmp = via[SR]; /* That's what happens in 2.2 */ - udelay(ADB_DELAY); /* Give controller time to recover */ - - /* end of packet, deal with it */ - if (reading_reply) { - req = current_req; - req->reply_len = reply_ptr - req->reply; - if (req->data[0] == ADB_PACKET) { - /* Have to adjust the reply from ADB commands */ - if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) { - /* the 0x2 bit indicates no response */ - req->reply_len = 0; - } else { - /* leave just the command and result bytes in the reply */ - req->reply_len -= 2; - memmove(req->reply, req->reply + 2, req->reply_len); - } - } -#ifdef DEBUG_MACIISI_ADB - if (dump_reply) { - int i; - printk(KERN_DEBUG "maciisi_interrupt: reply is "); - for (i = 0; i < req->reply_len; ++i) - printk(" %.2x", req->reply[i]); - printk("\n"); - } -#endif - req->complete = 1; - current_req = req->next; - if (req->done) - (*req->done)(req); - /* Obviously, we got it */ - reading_reply = 0; - } else { - maciisi_input(maciisi_rbuf, reply_ptr - maciisi_rbuf); - } - maciisi_state = idle; - status = via[B] & (TIP|TREQ); - if (!(status & TREQ)) { - /* Timeout?! More likely, another packet coming in already */ -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "extra data after packet: status %x ifr %x\n", - status, via[IFR]); -#endif -#if 0 - udelay(ADB_DELAY); - via[B] |= TIP; - - maciisi_state = reading; - reading_reply = 0; - reply_ptr = maciisi_rbuf; -#else - /* Process the packet now */ - reading_reply = 0; - goto switch_start; -#endif - /* We used to do this... but the controller might actually have data for us */ - /* maciisi_stfu(); */ - } - else { - /* Do any queued requests now if possible */ - i = maciisi_start(); - if(i == 0 && need_sync) { - /* Packet needs to be synced */ - maciisi_sync(current_req); - } - if(i != -EBUSY) - need_sync = 0; - } - break; - - default: - printk("maciisi_interrupt: unknown maciisi_state %d?\n", maciisi_state); - } - local_irq_restore(flags); - return IRQ_HANDLED; -} - -static void -maciisi_input(unsigned char *buf, int nb) -{ -#ifdef DEBUG_MACIISI_ADB - int i; -#endif - - switch (buf[0]) { - case ADB_PACKET: - adb_input(buf+2, nb-2, buf[1] & 0x40); - break; - default: -#ifdef DEBUG_MACIISI_ADB - printk(KERN_DEBUG "data from IIsi ADB (%d bytes):", nb); - for (i = 0; i < nb; ++i) - printk(" %.2x", buf[i]); - printk("\n"); -#endif - break; - } -} |