/* ipm_quark_se.h - Quark SE mailbox driver */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef __INCquark_se_mailboxh
#define __INCquark_se_mailboxh

#include <nanokernel.h>
#include <board.h> /* for SCSS_REGISTER_BASE */
#include <ipm.h>
#include <device.h>
#include <init.h>

#ifdef __cplusplus
extern "C" {
#endif

#define QUARK_SE_IPM_OUTBOUND	0
#define QUARK_SE_IPM_INBOUND		1

#if defined(CONFIG_SOC_QUARK_SE)
/* First byte of the QUARK_SE_IPM_MASK register is for the Lakemont */
#define QUARK_SE_IPM_MASK_START_BIT		0
#define QUARK_SE_IPM_INTERRUPT		21
#define QUARK_SE_IPM_ARC_LMT_DIR		QUARK_SE_IPM_INBOUND
#define QUARK_SE_IPM_LMT_ARC_DIR		QUARK_SE_IPM_OUTBOUND

#elif defined(CONFIG_SOC_QUARK_SE_SS)
/* Second byte is for ARC */
#define QUARK_SE_IPM_MASK_START_BIT		8
#define QUARK_SE_IPM_INTERRUPT		57
#define QUARK_SE_IPM_ARC_LMT_DIR		QUARK_SE_IPM_OUTBOUND
#define QUARK_SE_IPM_LMT_ARC_DIR		QUARK_SE_IPM_INBOUND

#else
#error "Unsupported platform for ipm_quark_se driver"
#endif

#define QUARK_SE_IPM_CHANNELS	8
#define QUARK_SE_IPM_DATA_BYTES	(4 * sizeof(uint32_t))
#define QUARK_SE_IPM_MAX_ID_VAL	0x7FFFFFFF

/* QUARK_SE EAS section 28.5.1.123 */
struct __packed quark_se_ipm_ch_ctrl {
	uint32_t ctrl : 31;
	uint32_t irq : 1;
};

struct __packed quark_se_ipm_ch_sts {
	uint32_t sts : 1;
	uint32_t irq : 1;
	uint32_t reserved : 30;
};

struct __packed quark_se_ipm {
	struct quark_se_ipm_ch_ctrl ctrl;
	uint8_t data[QUARK_SE_IPM_DATA_BYTES]; /* contiguous 32-bit registers */
	struct quark_se_ipm_ch_sts sts;
};

/* Base address for mailboxes
 *
 * Layout:
 *
 * quark_se_ipm[8]
 * QUARK_SE_IPM_CHALL_STS
 */
#define QUARK_SE_IPM_BASE		(SCSS_REGISTER_BASE + 0xa00)

/* 28.5.1.73 Host processor Interrupt routing mask 21
 *
 * Bits		Description
 * 31:24	Mailbox SS Halt interrupt maskIUL
 * 23:16	Mailbox Host Halt interrupt mask
 * 15:8		Mailbox SS interrupt mask
 * 7:0		Mailbox Host interrupt mask
 */
#define QUARK_SE_IPM_MASK		(SCSS_REGISTER_BASE + 0x4a0)

/* All status bits of the mailboxes
 *
 * Bits		Description
 * 31:16	Reserved
 * 15:0		CHn_STS bits (sts/irq) for all channels
 */
#define QUARK_SE_IPM_CHALL_STS	(SCSS_REGISTER_BASE + 0x0AC0)

#define QUARK_SE_IPM(channel)	((volatile struct quark_se_ipm *)(QUARK_SE_IPM_BASE + \
					((channel) * sizeof(struct quark_se_ipm))))


/* XXX I pulled this number out of thin air -- how to choose
 * the right priority?
 */
#define QUARK_SE_IPM_INTERRUPT_PRI		2

struct quark_se_ipm_controller_config_info {
	int (*controller_init)(void);
};

struct quark_se_ipm_config_info {
	int channel;
	int direction;
	volatile struct quark_se_ipm *ipm;
};


struct quark_se_ipm_driver_data {
	ipm_callback_t callback;
	void *callback_ctx;
};

void quark_se_ipm_isr(void *param);

int quark_se_ipm_initialize(struct device *d);
int quark_se_ipm_controller_initialize(struct device *d);

#define QUARK_SE_IPM_DEFINE(name, ch, dir) \
	struct quark_se_ipm_config_info quark_se_ipm_config_##name = { \
		.ipm = QUARK_SE_IPM(ch), \
		.channel = ch, \
		.direction = dir \
	}; \
	struct quark_se_ipm_driver_data quark_se_ipm_runtime_##name; \
	DEVICE_INIT(name, _STRINGIFY(name), quark_se_ipm_initialize, \
				&quark_se_ipm_runtime_##name, &quark_se_ipm_config_##name, \
				SECONDARY, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT)

#ifdef __cplusplus
}
#endif

#endif /* __INCquark_se_mailboxh */