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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2018 NXP
*
* Peng Fan <peng.fan@nxp.com>
*/
#include <common.h>
#include <log.h>
#include <asm/io.h>
#include <dm.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <dm/device-internal.h>
#include <asm/arch/sci/sci.h>
#include <linux/iopoll.h>
#include <misc.h>
DECLARE_GLOBAL_DATA_PTR;
struct mu_type {
u32 tr[4];
u32 rr[4];
u32 sr;
u32 cr;
};
struct imx8_scu {
struct mu_type *base;
};
#define MU_CR_GIE_MASK 0xF0000000u
#define MU_CR_RIE_MASK 0xF000000u
#define MU_CR_GIR_MASK 0xF0000u
#define MU_CR_TIE_MASK 0xF00000u
#define MU_CR_F_MASK 0x7u
#define MU_SR_TE0_MASK BIT(23)
#define MU_SR_RF0_MASK BIT(27)
#define MU_TR_COUNT 4
#define MU_RR_COUNT 4
static inline void mu_hal_init(struct mu_type *base)
{
/* Clear GIEn, RIEn, TIEn, GIRn and ABFn. */
clrbits_le32(&base->cr, MU_CR_GIE_MASK | MU_CR_RIE_MASK |
MU_CR_TIE_MASK | MU_CR_GIR_MASK | MU_CR_F_MASK);
}
static int mu_hal_sendmsg(struct mu_type *base, u32 reg_index, u32 msg)
{
u32 mask = MU_SR_TE0_MASK >> reg_index;
u32 val;
int ret;
assert(reg_index < MU_TR_COUNT);
/* Wait TX register to be empty. */
ret = readl_poll_timeout(&base->sr, val, val & mask, 10000);
if (ret < 0) {
printf("%s timeout\n", __func__);
return -ETIMEDOUT;
}
writel(msg, &base->tr[reg_index]);
return 0;
}
static int mu_hal_receivemsg(struct mu_type *base, u32 reg_index, u32 *msg)
{
u32 mask = MU_SR_RF0_MASK >> reg_index;
u32 val;
int ret;
assert(reg_index < MU_TR_COUNT);
/* Wait RX register to be full. */
ret = readl_poll_timeout(&base->sr, val, val & mask, 1000000);
if (ret < 0) {
printf("%s timeout\n", __func__);
return -ETIMEDOUT;
}
*msg = readl(&base->rr[reg_index]);
return 0;
}
static int sc_ipc_read(struct mu_type *base, void *data)
{
struct sc_rpc_msg_s *msg = (struct sc_rpc_msg_s *)data;
int ret;
u8 count = 0;
if (!msg)
return -EINVAL;
/* Read first word */
ret = mu_hal_receivemsg(base, 0, (u32 *)msg);
if (ret)
return ret;
count++;
/* Check size */
if (msg->size > SC_RPC_MAX_MSG) {
*((u32 *)msg) = 0;
return -EINVAL;
}
/* Read remaining words */
while (count < msg->size) {
ret = mu_hal_receivemsg(base, count % MU_RR_COUNT,
&msg->DATA.u32[count - 1]);
if (ret)
return ret;
count++;
}
return 0;
}
static int sc_ipc_write(struct mu_type *base, void *data)
{
struct sc_rpc_msg_s *msg = (struct sc_rpc_msg_s *)data;
int ret;
u8 count = 0;
if (!msg)
return -EINVAL;
/* Check size */
if (msg->size > SC_RPC_MAX_MSG)
return -EINVAL;
/* Write first word */
ret = mu_hal_sendmsg(base, 0, *((u32 *)msg));
if (ret)
return ret;
count++;
/* Write remaining words */
while (count < msg->size) {
ret = mu_hal_sendmsg(base, count % MU_TR_COUNT,
msg->DATA.u32[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 imx8_scu_call(struct udevice *dev, int no_resp, void *tx_msg,
int tx_size, void *rx_msg, int rx_size)
{
struct imx8_scu *plat = dev_get_platdata(dev);
sc_err_t 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 = sc_ipc_write(plat->base, tx_msg);
if (ret)
return ret;
if (!no_resp) {
ret = sc_ipc_read(plat->base, rx_msg);
if (ret)
return ret;
}
result = RPC_R8((struct sc_rpc_msg_s *)tx_msg);
return sc_err_to_linux(result);
}
static int imx8_scu_probe(struct udevice *dev)
{
struct imx8_scu *plat = dev_get_platdata(dev);
fdt_addr_t addr;
debug("%s(dev=%p) (plat=%p)\n", __func__, dev, plat);
addr = devfdt_get_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
#ifdef CONFIG_SPL_BUILD
plat->base = (struct mu_type *)CONFIG_MU_BASE_SPL;
#else
plat->base = (struct mu_type *)addr;
#endif
/* U-Boot not enable interrupts, so need to enable RX interrupts */
mu_hal_init(plat->base);
gd->arch.scu_dev = dev;
return 0;
}
static int imx8_scu_remove(struct udevice *dev)
{
return 0;
}
static int imx8_scu_bind(struct udevice *dev)
{
int ret;
struct udevice *child;
ofnode node;
debug("%s(dev=%p)\n", __func__, dev);
ofnode_for_each_subnode(node, dev_ofnode(dev)) {
ret = lists_bind_fdt(dev, node, &child, true);
if (ret)
return ret;
debug("bind child dev %s\n", child->name);
}
return 0;
}
static struct misc_ops imx8_scu_ops = {
.call = imx8_scu_call,
};
static const struct udevice_id imx8_scu_ids[] = {
{ .compatible = "fsl,imx8qxp-mu" },
{ .compatible = "fsl,imx8-mu" },
{ }
};
U_BOOT_DRIVER(imx8_scu) = {
.name = "imx8_scu",
.id = UCLASS_MISC,
.of_match = imx8_scu_ids,
.probe = imx8_scu_probe,
.bind = imx8_scu_bind,
.remove = imx8_scu_remove,
.ops = &imx8_scu_ops,
.platdata_auto_alloc_size = sizeof(struct imx8_scu),
.flags = DM_FLAG_PRE_RELOC,
};
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