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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
*
* Secure monitor calls.
*/
#include <dm.h>
#include <log.h>
#include <regmap.h>
#include <sm.h>
#include <syscon.h>
#include <asm/arch/sm.h>
#include <asm/cache.h>
#include <asm/global_data.h>
#include <asm/ptrace.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/bitfield.h>
#include <meson/sm.h>
static inline struct udevice *meson_get_sm_device(void)
{
struct udevice *dev;
int err;
err = uclass_first_device_err(UCLASS_SM, &dev);
if (err) {
pr_err("Mesom SM device not found\n");
return ERR_PTR(err);
}
return dev;
}
ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size)
{
struct udevice *dev;
struct pt_regs regs = { 0 };
int err;
dev = meson_get_sm_device();
if (IS_ERR(dev))
return PTR_ERR(dev);
regs.regs[1] = offset;
regs.regs[2] = size;
err = sm_call_read(dev, buffer, size,
MESON_SMC_CMD_EFUSE_READ, ®s);
if (err < 0)
pr_err("Failed to read efuse memory (%d)\n", err);
return err;
}
ssize_t meson_sm_write_efuse(uintptr_t offset, void *buffer, size_t size)
{
struct udevice *dev;
struct pt_regs regs = { 0 };
int err;
dev = meson_get_sm_device();
if (IS_ERR(dev))
return PTR_ERR(dev);
regs.regs[1] = offset;
regs.regs[2] = size;
err = sm_call_write(dev, buffer, size,
MESON_SMC_CMD_EFUSE_WRITE, ®s);
if (err < 0)
pr_err("Failed to write efuse memory (%d)\n", err);
return err;
}
#define SM_CHIP_ID_LENGTH 119
#define SM_CHIP_ID_OFFSET 4
#define SM_CHIP_ID_SIZE 12
int meson_sm_get_serial(void *buffer, size_t size)
{
struct udevice *dev;
struct pt_regs regs = { 0 };
u8 id_buffer[SM_CHIP_ID_LENGTH];
int err;
dev = meson_get_sm_device();
if (IS_ERR(dev))
return PTR_ERR(dev);
err = sm_call_read(dev, id_buffer, SM_CHIP_ID_LENGTH,
MESON_SMC_CMD_CHIP_ID_GET, ®s);
if (err < 0)
pr_err("Failed to read serial number (%d)\n", err);
memcpy(buffer, id_buffer + SM_CHIP_ID_OFFSET, size);
return 0;
}
#define AO_SEC_SD_CFG15 0xfc
#define REBOOT_REASON_MASK GENMASK(15, 12)
int meson_sm_get_reboot_reason(void)
{
struct regmap *regmap;
int nodeoffset;
ofnode node;
unsigned int reason;
/* find the offset of compatible node */
nodeoffset = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
"amlogic,meson-gx-ao-secure");
if (nodeoffset < 0) {
printf("%s: failed to get amlogic,meson-gx-ao-secure\n",
__func__);
return -ENODEV;
}
/* get regmap from the syscon node */
node = offset_to_ofnode(nodeoffset);
regmap = syscon_node_to_regmap(node);
if (IS_ERR(regmap)) {
printf("%s: failed to get regmap\n", __func__);
return -EINVAL;
}
regmap_read(regmap, AO_SEC_SD_CFG15, &reason);
/* The SMC call is not used, we directly use AO_SEC_SD_CFG15 */
return FIELD_GET(REBOOT_REASON_MASK, reason);
}
int meson_sm_pwrdm_set(size_t index, int cmd)
{
struct udevice *dev;
struct pt_regs regs = { 0 };
int err;
dev = meson_get_sm_device();
if (IS_ERR(dev))
return PTR_ERR(dev);
regs.regs[1] = index;
regs.regs[2] = cmd;
err = sm_call(dev, MESON_SMC_CMD_PWRDM_SET, NULL, ®s);
if (err)
pr_err("Failed to %s power domain ind=%zu (%d)\n", cmd == PWRDM_ON ?
"enable" : "disable", index, err);
return err;
}
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