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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2020 NXP
*/
#include <common.h>
#include <asm/io.h>
#include <dm.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <dm/device-internal.h>
#include <asm/arch/s400_api.h>
#include <linux/iopoll.h>
#include <misc.h>
DECLARE_GLOBAL_DATA_PTR;
struct mu_type {
u32 ver;
u32 par;
u32 cr;
u32 sr;
u32 reserved0[68];
u32 tcr;
u32 tsr;
u32 rcr;
u32 rsr;
u32 reserved1[52];
u32 tr[16];
u32 reserved2[16];
u32 rr[16];
u32 reserved4[14];
u32 mu_attr;
};
struct imx8ulp_mu {
struct mu_type *base;
};
#define MU_SR_TE0_MASK BIT(0)
#define MU_SR_RF0_MASK BIT(0)
#define MU_TR_COUNT 4
#define MU_RR_COUNT 4
void mu_hal_init(ulong base)
{
struct mu_type *mu_base = (struct mu_type *)base;
writel(0, &mu_base->tcr);
writel(0, &mu_base->rcr);
}
int mu_hal_sendmsg(ulong base, u32 reg_index, u32 msg)
{
struct mu_type *mu_base = (struct mu_type *)base;
u32 mask = MU_SR_TE0_MASK << reg_index;
u32 val;
int ret;
assert(reg_index < MU_TR_COUNT);
debug("sendmsg sr 0x%x\n", readl(&mu_base->sr));
/* Wait TX register to be empty. */
ret = readl_poll_timeout(&mu_base->tsr, val, val & mask, 10000);
if (ret < 0) {
debug("%s timeout\n", __func__);
return -ETIMEDOUT;
}
debug("tr[%d] 0x%x\n", reg_index, msg);
writel(msg, &mu_base->tr[reg_index]);
return 0;
}
int mu_hal_receivemsg(ulong base, u32 reg_index, u32 *msg)
{
struct mu_type *mu_base = (struct mu_type *)base;
u32 mask = MU_SR_RF0_MASK << reg_index;
u32 val;
int ret;
assert(reg_index < MU_TR_COUNT);
debug("receivemsg sr 0x%x\n", readl(&mu_base->sr));
/* Wait RX register to be full. */
ret = readl_poll_timeout(&mu_base->rsr, val, val & mask, 10000);
if (ret < 0) {
debug("%s timeout\n", __func__);
return -ETIMEDOUT;
}
*msg = readl(&mu_base->rr[reg_index]);
debug("rr[%d] 0x%x\n", reg_index, *msg);
return 0;
}
static int imx8ulp_mu_read(struct mu_type *base, void *data)
{
struct imx8ulp_s400_msg *msg = (struct imx8ulp_s400_msg *)data;
int ret;
u8 count = 0;
if (!msg)
return -EINVAL;
/* Read first word */
ret = mu_hal_receivemsg((ulong)base, 0, (u32 *)msg);
if (ret)
return ret;
count++;
/* Check size */
if (msg->size > S400_MAX_MSG) {
*((u32 *)msg) = 0;
return -EINVAL;
}
/* Read remaining words */
while (count < msg->size) {
ret = mu_hal_receivemsg((ulong)base, count % MU_RR_COUNT,
&msg->data[count - 1]);
if (ret)
return ret;
count++;
}
return 0;
}
static int imx8ulp_mu_write(struct mu_type *base, void *data)
{
struct imx8ulp_s400_msg *msg = (struct imx8ulp_s400_msg *)data;
int ret;
u8 count = 0;
if (!msg)
return -EINVAL;
/* Check size */
if (msg->size > S400_MAX_MSG)
return -EINVAL;
/* Write first word */
ret = mu_hal_sendmsg((ulong)base, 0, *((u32 *)msg));
if (ret)
return ret;
count++;
/* Write remaining words */
while (count < msg->size) {
ret = mu_hal_sendmsg((ulong)base, count % MU_TR_COUNT,
msg->data[count - 1]);
if (ret)
return ret;
count++;
}
return 0;
}
/*
* Note the function prototype use msgid as the 2nd parameter, here
* we take it as no_resp.
*/
static int imx8ulp_mu_call(struct udevice *dev, int no_resp, void *tx_msg,
int tx_size, void *rx_msg, int rx_size)
{
struct imx8ulp_mu *priv = dev_get_priv(dev);
u32 result;
int ret;
/* Expect tx_msg, rx_msg are the same value */
if (rx_msg && tx_msg != rx_msg)
printf("tx_msg %p, rx_msg %p\n", tx_msg, rx_msg);
ret = imx8ulp_mu_write(priv->base, tx_msg);
if (ret)
return ret;
if (!no_resp) {
ret = imx8ulp_mu_read(priv->base, rx_msg);
if (ret)
return ret;
}
result = ((struct imx8ulp_s400_msg *)rx_msg)->data[0];
if ((result & 0xff) == 0xd6)
return 0;
return -EIO;
}
static int imx8ulp_mu_probe(struct udevice *dev)
{
struct imx8ulp_mu *priv = dev_get_priv(dev);
fdt_addr_t addr;
debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
addr = devfdt_get_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->base = (struct mu_type *)addr;
debug("mu base 0x%lx\n", (ulong)priv->base);
/* U-Boot not enable interrupts, so need to enable RX interrupts */
mu_hal_init((ulong)priv->base);
gd->arch.s400_dev = dev;
return 0;
}
static int imx8ulp_mu_remove(struct udevice *dev)
{
return 0;
}
static int imx8ulp_mu_bind(struct udevice *dev)
{
debug("%s(dev=%p)\n", __func__, dev);
return 0;
}
static struct misc_ops imx8ulp_mu_ops = {
.call = imx8ulp_mu_call,
};
static const struct udevice_id imx8ulp_mu_ids[] = {
{ .compatible = "fsl,imx8ulp-mu" },
{ }
};
U_BOOT_DRIVER(imx8ulp_mu) = {
.name = "imx8ulp_mu",
.id = UCLASS_MISC,
.of_match = imx8ulp_mu_ids,
.probe = imx8ulp_mu_probe,
.bind = imx8ulp_mu_bind,
.remove = imx8ulp_mu_remove,
.ops = &imx8ulp_mu_ops,
.priv_auto = sizeof(struct imx8ulp_mu),
};
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