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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Marek Behun <marek.behun@nic.cz>
* Copyright (C) 2021 Pali Rohár <pali@kernel.org>
*/
#include <common.h>
#include <asm/arch/soc.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <mach/mbox.h>
#define RWTM_BASE (MVEBU_REGISTER(0xb0000))
#define RWTM_CMD_PARAM(i) (size_t)(RWTM_BASE + (i) * 4)
#define RWTM_CMD (RWTM_BASE + 0x40)
#define RWTM_CMD_RETSTATUS (RWTM_BASE + 0x80)
#define RWTM_CMD_STATUS(i) (size_t)(RWTM_BASE + 0x84 + (i) * 4)
#define MAX_ARGS 16
#define RWTM_HOST_INT_RESET (RWTM_BASE + 0xc8)
#define RWTM_HOST_INT_MASK (RWTM_BASE + 0xcc)
#define SP_CMD_COMPLETE BIT(0)
#define MBOX_STS_SUCCESS (0x0 << 30)
#define MBOX_STS_FAIL (0x1 << 30)
#define MBOX_STS_BADCMD (0x2 << 30)
#define MBOX_STS_LATER (0x3 << 30)
#define MBOX_STS_ERROR(s) ((s) & (3 << 30))
#define MBOX_STS_VALUE(s) (((s) >> 10) & 0xfffff)
#define MBOX_STS_CMD(s) ((s) & 0x3ff)
#define MBOX_STS_MARVELL_ERROR(s) ((s) == 0 ? 0 : \
(s) == 2 ? ETIMEDOUT : \
(s) == 3 ? EINVAL : \
(s) == 4 ? ENOSYS : \
EIO)
int mbox_do_cmd(enum mbox_cmd cmd, u32 *in, int nin, u32 *out, int nout)
{
const int tries = 50;
int i;
u32 status;
if (nin > MAX_ARGS || nout > MAX_ARGS)
return -EINVAL;
clrbits_le32(RWTM_HOST_INT_MASK, SP_CMD_COMPLETE);
for (i = 0; i < nin; i++)
writel(in[i], RWTM_CMD_PARAM(i));
for (; i < MAX_ARGS; i++)
writel(0x0, RWTM_CMD_PARAM(i));
writel(cmd, RWTM_CMD);
for (i = 0; i < tries; ++i) {
mdelay(10);
if (readl(RWTM_HOST_INT_RESET) & SP_CMD_COMPLETE)
break;
}
if (i == tries) {
/* if timed out, don't read status */
setbits_le32(RWTM_HOST_INT_RESET, SP_CMD_COMPLETE);
return -ETIMEDOUT;
}
for (i = 0; i < nout; ++i)
out[i] = readl(RWTM_CMD_STATUS(i));
status = readl(RWTM_CMD_RETSTATUS);
setbits_le32(RWTM_HOST_INT_RESET, SP_CMD_COMPLETE);
if (MBOX_STS_CMD(status) != cmd)
return -MBOX_STS_MARVELL_ERROR(status);
else if (MBOX_STS_ERROR(status) == MBOX_STS_FAIL)
return -(int)MBOX_STS_VALUE(status);
else if (MBOX_STS_ERROR(status) == MBOX_STS_BADCMD)
return -ENOSYS;
else if (MBOX_STS_ERROR(status) != MBOX_STS_SUCCESS)
return -EIO;
else
return MBOX_STS_VALUE(status);
}
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