hikey960: remove mailbox driver

Since this mailbox driver is abandoned, remove it.
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

plat/hisilicon/hikey960/hi3660_mailbox.c

-/*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-#include <assert.h>
-#include <debug.h>
-#include <errno.h>
-#include <hi3660_mailbox.h>
-#include <mailbox.h>
-#include <mmio.h>
-#include <string.h>
-
-typedef struct hi3660_chan {
-	unsigned char	src;
-	unsigned char	dst;
-	unsigned char	used;
-} hi3660_chan_t;
-
-static hi3660_chan_t chan_map[MBX_MAX_CHANNELS];
-
-static void hi3660_mbox_check_state(int chan, unsigned int state)
-{
-	unsigned int data;
-
-	data = mmio_read_32(MBX_MODE(chan));
-	assert((data & (MBX_MODE_AUTO_ANSWER | MBX_MODE_AUTO_LINK)) == 0);
-
-	data &= MBX_MODE_STATE_STATUS_MASK;
-	assert(data == state);
-	(void)state;
-}
-
-static int hi3660_mbox_send(int chan, void *message, int len)
-{
-	int i;
-	unsigned int *buf;
-	unsigned int data;
-
-	assert((chan >= 0) && (chan < MBX_MAX_CHANNELS) &&
-	       (message != NULL) && (len <= MBX_MAX_DATA_LEN));
-	assert((chan_map[chan].used != 0) &&
-	       (chan_map[chan].src != 0) &&
-	       (chan_map[chan].dst != 0));
-
-	buf = (unsigned int *)message;
-	len = ((len + 3) >> 2);		/* convert to word count */
-	for (i = 0; i < len; i++)
-		mmio_write_32(MBX_DATA0(chan) + (i << 2), *(buf + i));
-	/* send out */
-	mmio_write_32(MBX_SEND(chan), chan_map[chan].src);
-
-	do {
-		data = mmio_read_32(MBX_ICLR(chan));
-	} while ((data & chan_map[chan].src) == 0);
-	/* ack */
-	mmio_write_32(MBX_ICLR(chan), chan_map[chan].src);
-	return 0;
-}
-
-static int hi3660_mbox_recv(int chan, void *message, int *len)
-{
-	unsigned int *buf, data;
-	int i;
-
-	assert((chan >= 0) && (chan < MBX_MAX_CHANNELS) &&
-	       (message != NULL) && (len != NULL));
-	assert((chan_map[chan].used != 0) &&
-	       (chan_map[chan].src != 0) &&
-	       (chan_map[chan].dst != 0));
-	/* wait IPC event */
-	do {
-		data = mmio_read_32(MBX_MODE(chan));
-	} while ((data & MBX_MODE_STATE_STATUS_MASK) != MBX_MODE_STATE_DEST);
-	/* wait to clear interrupt */
-	do {
-		data = mmio_read_32(MBX_ICLR(chan));
-	} while (data == 0);
-	do {
-		mmio_write_32(MBX_ICLR(chan), chan_map[chan].dst);
-		data = mmio_read_32(MBX_ICLR(chan));
-	} while (data);
-
-	/* read data from IPC */
-	buf = (unsigned int *)message;
-	for (i = 0; i < MBX_MAX_DATA_LEN; i += 4)
-		*(buf + (i >> 2)) = mmio_read_32(MBX_DATA0(chan) + i);
-	*len = MBX_MAX_DATA_LEN;
-	/* ack */
-	mmio_write_32(MBX_SEND(chan), chan_map[chan].dst);
-	return 0;
-}
-
-static int hi3660_mbox_request(int chan, int direction)
-{
-	unsigned int data;
-	unsigned int src, dst;
-
-	assert((chan >= 0) && (chan < MBX_MAX_CHANNELS));
-
-	if (direction == MAILBOX_DIR_TX) {
-		src = CPU_A53;
-		dst = CPU_LPM3;
-	} else if (direction == MAILBOX_DIR_RX) {
-		src = CPU_LPM3;
-		dst = CPU_A53;
-	} else
-		assert(0);
-	mmio_write_32(MBX_SOURCE(chan), src);
-	data = mmio_read_32(MBX_SOURCE(chan));
-	assert(data == src);
-
-	/* mask all interrupts */
-	mmio_write_32(MBX_IMASK(chan), CPU_MASK);
-	/* unmask interrupt */
-	mmio_write_32(MBX_IMASK(chan), ~(src | dst));
-
-	/* set destination */
-	mmio_write_32(MBX_DCLEAR(chan), (~dst) & CPU_MASK);
-	mmio_write_32(MBX_DSET(chan), dst);
-	data = mmio_read_32(MBX_DSTATUS(chan));
-	assert((data & dst) != 0);
-
-	/* clear auto link & auto answer */
-	data = mmio_read_32(MBX_MODE(chan));
-	data &= ~(MBX_MODE_AUTO_ANSWER | MBX_MODE_AUTO_LINK);
-	mmio_write_32(MBX_MODE(chan), data);
-
-	hi3660_mbox_check_state(chan, MBX_MODE_STATE_SOURCE);
-	chan_map[chan].used = 1;
-	chan_map[chan].src = src;
-	chan_map[chan].dst = dst;
-	return 0;
-}
-
-static void hi3660_mbox_free(int chan)
-{
-	assert((chan >= 0) && (chan < MBX_MAX_CHANNELS));
-}
-
-static mbox_ops_t hi3660_mbox_ops = {
-	.send		= hi3660_mbox_send,
-	.recv		= hi3660_mbox_recv,
-	.request	= hi3660_mbox_request,
-	.free		= hi3660_mbox_free,
-};
-
-int hi3660_mbox_init(mbox_params_t *params)
-{
-	int result;
-	unsigned int data;
-
-	assert(params != NULL);
-	result = mbox_init(&hi3660_mbox_ops, params);
-	assert(result == 0);
-	memset(&chan_map, 0, sizeof(chan_map));
-
-	/* unlock mailbox */
-	data = mmio_read_32(IPC_LOCK);
-	while (data == MBX_IPC_LOCKED) {
-		mmio_write_32(IPC_LOCK, MBX_IPC_UNLOCK_MAGIC);
-		data = mmio_read_32(IPC_LOCK);
-	}
-	(void)result;
-	return 0;
-}