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805 lines
19 KiB
805 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Device driver for the Cuda and Egret system controllers found on PowerMacs |
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* and 68k Macs. |
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* |
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* The Cuda or Egret is a 6805 microcontroller interfaced to the 6522 VIA. |
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* This MCU controls system power, Parameter RAM, Real Time Clock and the |
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* Apple Desktop Bus (ADB) that connects to the keyboard and mouse. |
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* |
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* Copyright (C) 1996 Paul Mackerras. |
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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/cuda.h> |
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#include <linux/spinlock.h> |
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#include <linux/interrupt.h> |
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#ifdef CONFIG_PPC |
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#include <asm/prom.h> |
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#include <asm/machdep.h> |
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#else |
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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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#endif |
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#include <asm/io.h> |
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#include <linux/init.h> |
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static volatile unsigned char __iomem *via; |
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static DEFINE_SPINLOCK(cuda_lock); |
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|
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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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|
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/* |
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* When the Cuda design replaced the Egret, some signal names and |
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* logic sense changed. They all serve the same purposes, however. |
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* |
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* VIA pin | Egret pin |
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* ----------------+------------------------------------------ |
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* PB3 (input) | Transceiver session (active low) |
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* PB4 (output) | VIA full (active high) |
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* PB5 (output) | System session (active high) |
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* |
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* VIA pin | Cuda pin |
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* ----------------+------------------------------------------ |
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* PB3 (input) | Transfer request (active low) |
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* PB4 (output) | Byte acknowledge (active low) |
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* PB5 (output) | Transfer in progress (active low) |
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*/ |
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|
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/* Bits in Port B data register */ |
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#define TREQ 0x08 /* Transfer request */ |
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#define TACK 0x10 /* Transfer acknowledge */ |
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#define TIP 0x20 /* Transfer in progress */ |
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|
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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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|
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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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|
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/* Duration of byte acknowledgement pulse (us) */ |
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#define EGRET_TACK_ASSERTED_DELAY 300 |
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#define EGRET_TACK_NEGATED_DELAY 400 |
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|
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/* Interval from interrupt to start of session (us) */ |
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#define EGRET_SESSION_DELAY 450 |
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#ifdef CONFIG_PPC |
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#define mcu_is_egret false |
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#else |
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static bool mcu_is_egret; |
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#endif |
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static inline bool TREQ_asserted(u8 portb) |
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{ |
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return !(portb & TREQ); |
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} |
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static inline void assert_TIP(void) |
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{ |
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if (mcu_is_egret) { |
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udelay(EGRET_SESSION_DELAY); |
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out_8(&via[B], in_8(&via[B]) | TIP); |
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} else |
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out_8(&via[B], in_8(&via[B]) & ~TIP); |
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} |
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|
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static inline void assert_TIP_and_TACK(void) |
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{ |
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if (mcu_is_egret) { |
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udelay(EGRET_SESSION_DELAY); |
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out_8(&via[B], in_8(&via[B]) | TIP | TACK); |
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} else |
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out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK)); |
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} |
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static inline void assert_TACK(void) |
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{ |
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if (mcu_is_egret) { |
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udelay(EGRET_TACK_NEGATED_DELAY); |
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out_8(&via[B], in_8(&via[B]) | TACK); |
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} else |
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out_8(&via[B], in_8(&via[B]) & ~TACK); |
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} |
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static inline void toggle_TACK(void) |
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{ |
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out_8(&via[B], in_8(&via[B]) ^ TACK); |
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} |
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static inline void negate_TACK(void) |
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{ |
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if (mcu_is_egret) { |
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udelay(EGRET_TACK_ASSERTED_DELAY); |
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out_8(&via[B], in_8(&via[B]) & ~TACK); |
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} else |
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out_8(&via[B], in_8(&via[B]) | TACK); |
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} |
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static inline void negate_TIP_and_TACK(void) |
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{ |
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if (mcu_is_egret) { |
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udelay(EGRET_TACK_ASSERTED_DELAY); |
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out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK)); |
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} else |
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out_8(&via[B], in_8(&via[B]) | TIP | TACK); |
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} |
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static enum cuda_state { |
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idle, |
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sent_first_byte, |
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sending, |
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reading, |
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read_done, |
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awaiting_reply |
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} cuda_state; |
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|
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static struct adb_request *current_req; |
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static struct adb_request *last_req; |
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static unsigned char cuda_rbuf[16]; |
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static unsigned char *reply_ptr; |
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static int reading_reply; |
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static int data_index; |
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static int cuda_irq; |
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#ifdef CONFIG_PPC |
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static struct device_node *vias; |
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#endif |
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static int cuda_fully_inited; |
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#ifdef CONFIG_ADB |
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static int cuda_probe(void); |
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static int cuda_send_request(struct adb_request *req, int sync); |
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static int cuda_adb_autopoll(int devs); |
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static int cuda_reset_adb_bus(void); |
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#endif /* CONFIG_ADB */ |
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static int cuda_init_via(void); |
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static void cuda_start(void); |
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static irqreturn_t cuda_interrupt(int irq, void *arg); |
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static void cuda_input(unsigned char *buf, int nb); |
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void cuda_poll(void); |
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static int cuda_write(struct adb_request *req); |
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int cuda_request(struct adb_request *req, |
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void (*done)(struct adb_request *), int nbytes, ...); |
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#ifdef CONFIG_ADB |
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struct adb_driver via_cuda_driver = { |
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.name = "CUDA", |
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.probe = cuda_probe, |
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.send_request = cuda_send_request, |
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.autopoll = cuda_adb_autopoll, |
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.poll = cuda_poll, |
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.reset_bus = cuda_reset_adb_bus, |
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}; |
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#endif /* CONFIG_ADB */ |
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#ifdef CONFIG_MAC |
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int __init find_via_cuda(void) |
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{ |
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struct adb_request req; |
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int err; |
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if (macintosh_config->adb_type != MAC_ADB_CUDA && |
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macintosh_config->adb_type != MAC_ADB_EGRET) |
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return 0; |
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via = via1; |
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cuda_state = idle; |
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mcu_is_egret = macintosh_config->adb_type == MAC_ADB_EGRET; |
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err = cuda_init_via(); |
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if (err) { |
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printk(KERN_ERR "cuda_init_via() failed\n"); |
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via = NULL; |
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return 0; |
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} |
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/* enable autopoll */ |
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cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1); |
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while (!req.complete) |
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cuda_poll(); |
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return 1; |
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} |
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#else |
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int __init find_via_cuda(void) |
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{ |
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struct adb_request req; |
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phys_addr_t taddr; |
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const u32 *reg; |
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int err; |
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if (vias != 0) |
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return 1; |
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vias = of_find_node_by_name(NULL, "via-cuda"); |
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if (vias == 0) |
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return 0; |
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reg = of_get_property(vias, "reg", NULL); |
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if (reg == NULL) { |
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printk(KERN_ERR "via-cuda: No \"reg\" property !\n"); |
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goto fail; |
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} |
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taddr = of_translate_address(vias, reg); |
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if (taddr == 0) { |
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printk(KERN_ERR "via-cuda: Can't translate address !\n"); |
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goto fail; |
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} |
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via = ioremap(taddr, 0x2000); |
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if (via == NULL) { |
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printk(KERN_ERR "via-cuda: Can't map address !\n"); |
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goto fail; |
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} |
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cuda_state = idle; |
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sys_ctrler = SYS_CTRLER_CUDA; |
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err = cuda_init_via(); |
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if (err) { |
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printk(KERN_ERR "cuda_init_via() failed\n"); |
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via = NULL; |
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return 0; |
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} |
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/* Clear and enable interrupts, but only on PPC. On 68K it's done */ |
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/* for us by the main VIA driver in arch/m68k/mac/via.c */ |
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out_8(&via[IFR], 0x7f); /* clear interrupts by writing 1s */ |
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out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */ |
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/* enable autopoll */ |
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cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1); |
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while (!req.complete) |
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cuda_poll(); |
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return 1; |
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fail: |
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of_node_put(vias); |
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vias = NULL; |
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return 0; |
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} |
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#endif /* !defined CONFIG_MAC */ |
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static int __init via_cuda_start(void) |
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{ |
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if (via == NULL) |
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return -ENODEV; |
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#ifdef CONFIG_MAC |
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cuda_irq = IRQ_MAC_ADB; |
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#else |
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cuda_irq = irq_of_parse_and_map(vias, 0); |
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if (!cuda_irq) { |
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printk(KERN_ERR "via-cuda: can't map interrupts for %pOF\n", |
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vias); |
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return -ENODEV; |
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} |
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#endif |
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if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) { |
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printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq); |
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return -EAGAIN; |
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} |
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pr_info("Macintosh Cuda and Egret driver.\n"); |
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cuda_fully_inited = 1; |
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return 0; |
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} |
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device_initcall(via_cuda_start); |
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#ifdef CONFIG_ADB |
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static int |
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cuda_probe(void) |
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{ |
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#ifdef CONFIG_PPC |
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if (sys_ctrler != SYS_CTRLER_CUDA) |
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return -ENODEV; |
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#else |
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if (macintosh_config->adb_type != MAC_ADB_CUDA && |
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macintosh_config->adb_type != MAC_ADB_EGRET) |
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return -ENODEV; |
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#endif |
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if (via == NULL) |
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return -ENODEV; |
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return 0; |
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} |
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#endif /* CONFIG_ADB */ |
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static int __init sync_egret(void) |
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{ |
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if (TREQ_asserted(in_8(&via[B]))) { |
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/* Complete the inbound transfer */ |
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assert_TIP_and_TACK(); |
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while (1) { |
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negate_TACK(); |
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mdelay(1); |
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(void)in_8(&via[SR]); |
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assert_TACK(); |
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if (!TREQ_asserted(in_8(&via[B]))) |
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break; |
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} |
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negate_TIP_and_TACK(); |
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} else if (in_8(&via[B]) & TIP) { |
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/* Terminate the outbound transfer */ |
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negate_TACK(); |
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assert_TACK(); |
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mdelay(1); |
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negate_TIP_and_TACK(); |
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} |
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/* Clear shift register interrupt */ |
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if (in_8(&via[IFR]) & SR_INT) |
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(void)in_8(&via[SR]); |
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return 0; |
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} |
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#define WAIT_FOR(cond, what) \ |
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do { \ |
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int x; \ |
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for (x = 1000; !(cond); --x) { \ |
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if (x == 0) { \ |
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pr_err("Timeout waiting for " what "\n"); \ |
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return -ENXIO; \ |
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} \ |
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udelay(100); \ |
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} \ |
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} while (0) |
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static int |
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__init cuda_init_via(void) |
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{ |
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#ifdef CONFIG_PPC |
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out_8(&via[IER], 0x7f); /* disable interrupts from VIA */ |
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(void)in_8(&via[IER]); |
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#else |
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out_8(&via[IER], SR_INT); /* disable SR interrupt from VIA */ |
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#endif |
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out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */ |
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out_8(&via[ACR], (in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT); /* SR data in */ |
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(void)in_8(&via[SR]); /* clear any left-over data */ |
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if (mcu_is_egret) |
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return sync_egret(); |
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negate_TIP_and_TACK(); |
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/* delay 4ms and then clear any pending interrupt */ |
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mdelay(4); |
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(void)in_8(&via[SR]); |
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out_8(&via[IFR], SR_INT); |
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/* sync with the CUDA - assert TACK without TIP */ |
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assert_TACK(); |
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/* wait for the CUDA to assert TREQ in response */ |
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WAIT_FOR(TREQ_asserted(in_8(&via[B])), "CUDA response to sync"); |
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/* wait for the interrupt and then clear it */ |
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WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)"); |
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(void)in_8(&via[SR]); |
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out_8(&via[IFR], SR_INT); |
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/* finish the sync by negating TACK */ |
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negate_TACK(); |
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/* wait for the CUDA to negate TREQ and the corresponding interrupt */ |
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WAIT_FOR(!TREQ_asserted(in_8(&via[B])), "CUDA response to sync (3)"); |
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WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)"); |
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(void)in_8(&via[SR]); |
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out_8(&via[IFR], SR_INT); |
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return 0; |
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} |
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#ifdef CONFIG_ADB |
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/* Send an ADB command */ |
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static int |
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cuda_send_request(struct adb_request *req, int sync) |
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{ |
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int i; |
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if ((via == NULL) || !cuda_fully_inited) { |
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req->complete = 1; |
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return -ENXIO; |
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} |
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req->reply_expected = 1; |
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i = cuda_write(req); |
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if (i) |
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return i; |
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if (sync) { |
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while (!req->complete) |
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cuda_poll(); |
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} |
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return 0; |
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} |
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/* Enable/disable autopolling */ |
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static int |
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cuda_adb_autopoll(int devs) |
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{ |
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struct adb_request req; |
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if ((via == NULL) || !cuda_fully_inited) |
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return -ENXIO; |
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cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0)); |
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while (!req.complete) |
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cuda_poll(); |
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return 0; |
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} |
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/* Reset adb bus - how do we do this?? */ |
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static int |
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cuda_reset_adb_bus(void) |
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{ |
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struct adb_request req; |
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if ((via == NULL) || !cuda_fully_inited) |
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return -ENXIO; |
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cuda_request(&req, NULL, 2, ADB_PACKET, 0); /* maybe? */ |
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while (!req.complete) |
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cuda_poll(); |
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return 0; |
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} |
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#endif /* CONFIG_ADB */ |
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/* Construct and send a cuda request */ |
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int |
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cuda_request(struct adb_request *req, void (*done)(struct adb_request *), |
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int nbytes, ...) |
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{ |
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va_list list; |
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int i; |
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if (via == NULL) { |
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req->complete = 1; |
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return -ENXIO; |
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} |
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req->nbytes = nbytes; |
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req->done = done; |
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va_start(list, nbytes); |
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for (i = 0; i < nbytes; ++i) |
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req->data[i] = va_arg(list, int); |
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va_end(list); |
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req->reply_expected = 1; |
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return cuda_write(req); |
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} |
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EXPORT_SYMBOL(cuda_request); |
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static int |
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cuda_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] > CUDA_PACKET) { |
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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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spin_lock_irqsave(&cuda_lock, flags); |
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if (current_req != 0) { |
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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 (cuda_state == idle) |
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cuda_start(); |
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} |
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spin_unlock_irqrestore(&cuda_lock, flags); |
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return 0; |
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} |
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static void |
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cuda_start(void) |
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{ |
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/* assert cuda_state == idle */ |
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if (current_req == NULL) |
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return; |
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data_index = 0; |
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if (TREQ_asserted(in_8(&via[B]))) |
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return; /* a byte is coming in from the CUDA */ |
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|
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/* set the shift register to shift out and send a byte */ |
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out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT); |
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out_8(&via[SR], current_req->data[data_index++]); |
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if (mcu_is_egret) |
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assert_TIP_and_TACK(); |
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else |
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assert_TIP(); |
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cuda_state = sent_first_byte; |
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} |
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void |
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cuda_poll(void) |
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{ |
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cuda_interrupt(0, NULL); |
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} |
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EXPORT_SYMBOL(cuda_poll); |
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#define ARRAY_FULL(a, p) ((p) - (a) == ARRAY_SIZE(a)) |
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|
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static irqreturn_t |
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cuda_interrupt(int irq, void *arg) |
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{ |
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unsigned long flags; |
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u8 status; |
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struct adb_request *req = NULL; |
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unsigned char ibuf[16]; |
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int ibuf_len = 0; |
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int complete = 0; |
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bool full; |
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spin_lock_irqsave(&cuda_lock, flags); |
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|
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/* On powermacs, this handler is registered for the VIA IRQ. But they use |
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* just the shift register IRQ -- other VIA interrupt sources are disabled. |
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* On m68k macs, the VIA IRQ sources are dispatched individually. Unless |
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* we are polling, the shift register IRQ flag has already been cleared. |
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*/ |
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|
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#ifdef CONFIG_MAC |
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if (!arg) |
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#endif |
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{ |
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if ((in_8(&via[IFR]) & SR_INT) == 0) { |
|
spin_unlock_irqrestore(&cuda_lock, flags); |
|
return IRQ_NONE; |
|
} else { |
|
out_8(&via[IFR], SR_INT); |
|
} |
|
} |
|
|
|
status = in_8(&via[B]) & (TIP | TACK | TREQ); |
|
|
|
switch (cuda_state) { |
|
case idle: |
|
/* System controller has unsolicited data for us */ |
|
(void)in_8(&via[SR]); |
|
idle_state: |
|
assert_TIP(); |
|
cuda_state = reading; |
|
reply_ptr = cuda_rbuf; |
|
reading_reply = 0; |
|
break; |
|
|
|
case awaiting_reply: |
|
/* System controller has reply data for us */ |
|
(void)in_8(&via[SR]); |
|
assert_TIP(); |
|
cuda_state = reading; |
|
reply_ptr = current_req->reply; |
|
reading_reply = 1; |
|
break; |
|
|
|
case sent_first_byte: |
|
if (TREQ_asserted(status)) { |
|
/* collision */ |
|
out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT); |
|
(void)in_8(&via[SR]); |
|
negate_TIP_and_TACK(); |
|
cuda_state = idle; |
|
/* Egret does not raise an "aborted" interrupt */ |
|
if (mcu_is_egret) |
|
goto idle_state; |
|
} else { |
|
out_8(&via[SR], current_req->data[data_index++]); |
|
toggle_TACK(); |
|
if (mcu_is_egret) |
|
assert_TACK(); |
|
cuda_state = sending; |
|
} |
|
break; |
|
|
|
case sending: |
|
req = current_req; |
|
if (data_index >= req->nbytes) { |
|
out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT); |
|
(void)in_8(&via[SR]); |
|
negate_TIP_and_TACK(); |
|
req->sent = 1; |
|
if (req->reply_expected) { |
|
cuda_state = awaiting_reply; |
|
} else { |
|
current_req = req->next; |
|
complete = 1; |
|
/* not sure about this */ |
|
cuda_state = idle; |
|
cuda_start(); |
|
} |
|
} else { |
|
out_8(&via[SR], req->data[data_index++]); |
|
toggle_TACK(); |
|
if (mcu_is_egret) |
|
assert_TACK(); |
|
} |
|
break; |
|
|
|
case reading: |
|
full = reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr) |
|
: ARRAY_FULL(cuda_rbuf, reply_ptr); |
|
if (full) |
|
(void)in_8(&via[SR]); |
|
else |
|
*reply_ptr++ = in_8(&via[SR]); |
|
if (!TREQ_asserted(status) || full) { |
|
if (mcu_is_egret) |
|
assert_TACK(); |
|
/* that's all folks */ |
|
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 { |
|
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; |
|
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); |
|
} |
|
} |
|
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 |
|
* re-entered from another CPU getting an interrupt |
|
* or calling cuda_poll(). I ended up using the stack |
|
* (it's only for 16 bytes) and moving the actual |
|
* call to cuda_input to outside of the lock. |
|
*/ |
|
ibuf_len = reply_ptr - cuda_rbuf; |
|
memcpy(ibuf, cuda_rbuf, ibuf_len); |
|
} |
|
reply_ptr = cuda_rbuf; |
|
cuda_state = idle; |
|
cuda_start(); |
|
if (cuda_state == idle && TREQ_asserted(in_8(&via[B]))) { |
|
assert_TIP(); |
|
cuda_state = reading; |
|
} |
|
break; |
|
|
|
default: |
|
pr_err("cuda_interrupt: unknown cuda_state %d?\n", cuda_state); |
|
} |
|
spin_unlock_irqrestore(&cuda_lock, flags); |
|
if (complete && req) { |
|
void (*done)(struct adb_request *) = req->done; |
|
mb(); |
|
req->complete = 1; |
|
/* Here, we assume that if the request has a done member, the |
|
* struct request will survive to setting req->complete to 1 |
|
*/ |
|
if (done) |
|
(*done)(req); |
|
} |
|
if (ibuf_len) |
|
cuda_input(ibuf, ibuf_len); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static void |
|
cuda_input(unsigned char *buf, int nb) |
|
{ |
|
switch (buf[0]) { |
|
case ADB_PACKET: |
|
#ifdef CONFIG_XMON |
|
if (nb == 5 && buf[2] == 0x2c) { |
|
extern int xmon_wants_key, xmon_adb_keycode; |
|
if (xmon_wants_key) { |
|
xmon_adb_keycode = buf[3]; |
|
return; |
|
} |
|
} |
|
#endif /* CONFIG_XMON */ |
|
#ifdef CONFIG_ADB |
|
adb_input(buf+2, nb-2, buf[1] & 0x40); |
|
#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: |
|
print_hex_dump(KERN_INFO, "cuda_input: ", DUMP_PREFIX_NONE, 32, 1, |
|
buf, nb, false); |
|
} |
|
} |
|
|
|
/* Offset between Unix time (1970-based) and Mac time (1904-based) */ |
|
#define RTC_OFFSET 2082844800 |
|
|
|
time64_t cuda_get_time(void) |
|
{ |
|
struct adb_request req; |
|
u32 now; |
|
|
|
if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0) |
|
return 0; |
|
while (!req.complete) |
|
cuda_poll(); |
|
if (req.reply_len != 7) |
|
pr_err("%s: got %d byte reply\n", __func__, req.reply_len); |
|
now = (req.reply[3] << 24) + (req.reply[4] << 16) + |
|
(req.reply[5] << 8) + req.reply[6]; |
|
return (time64_t)now - RTC_OFFSET; |
|
} |
|
|
|
int cuda_set_rtc_time(struct rtc_time *tm) |
|
{ |
|
u32 now; |
|
struct adb_request req; |
|
|
|
now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET); |
|
if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME, |
|
now >> 24, now >> 16, now >> 8, now) < 0) |
|
return -ENXIO; |
|
while (!req.complete) |
|
cuda_poll(); |
|
if ((req.reply_len != 3) && (req.reply_len != 7)) |
|
pr_err("%s: got %d byte reply\n", __func__, req.reply_len); |
|
return 0; |
|
}
|
|
|