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u-boot/arch/arm/mach-imx/mx7ulp/soc.c
Harald Seiler 35b65dd8ef reset: Remove addr parameter from reset_cpu() 
Historically, the reset_cpu() function had an `addr` parameter which was
meant to pass in an address of the reset vector location, where the CPU
should reset to.  This feature is no longer used anywhere in U-Boot as
all reset_cpu() implementations now ignore the passed value.  Generic
code has been added which always calls reset_cpu() with `0` which means
this feature can no longer be used easily anyway.

Over time, many implementations seem to have "misunderstood" the
existence of this parameter as a way to customize/parameterize the reset
(e.g.  COLD vs WARM resets).  As this is not properly supported, the
code will almost always not do what it is intended to (because all
call-sites just call reset_cpu() with 0).

To avoid confusion and to clean up the codebase from unused left-overs
of the past, remove the `addr` parameter entirely.  Code which intends
to support different kinds of resets should be rewritten as a sysreset
driver instead.

This transformation was done with the following coccinelle patch:

    @@
    expression argvalue;
    @@
    - reset_cpu(argvalue)
    + reset_cpu()

    @@
    identifier argname;
    type argtype;
    @@
    - reset_cpu(argtype argname)
    + reset_cpu(void)
    { ... }

Signed-off-by: Harald Seiler <hws@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-03-02 14:03:02 -05:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*/
#include <common.h>
#include <cpu_func.h>
#include <init.h>
#include <log.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <asm/mach-imx/boot_mode.h>
#include <asm/mach-imx/hab.h>
#include <linux/bitops.h>
#define PMC0_BASE_ADDR 0x410a1000
#define PMC0_CTRL 0x28
#define PMC0_CTRL_LDOEN BIT(31)
#define PMC0_CTRL_LDOOKDIS BIT(30)
#define PMC0_CTRL_PMC1ON BIT(24)
#define PMC1_BASE_ADDR 0x40400000
#define PMC1_RUN 0x8
#define PMC1_STOP 0x10
#define PMC1_VLPS 0x14
#define PMC1_LDOVL_SHIFT 16
#define PMC1_LDOVL_MASK (0x3f << PMC1_LDOVL_SHIFT)
#define PMC1_LDOVL_900 0x1e
#define PMC1_LDOVL_950 0x23
#define PMC1_STATUS 0x20
#define PMC1_STATUS_LDOVLF BIT(8)
static char *get_reset_cause(char *);
#if defined(CONFIG_IMX_HAB)
struct imx_sec_config_fuse_t const imx_sec_config_fuse = {
.bank = 29,
.word = 6,
};
#endif
#define ROM_VERSION_ADDR 0x80
u32 get_cpu_rev(void)
{
/* Check the ROM version for cpu revision */
u32 rom_version = readl((void __iomem *)ROM_VERSION_ADDR);
return (MXC_CPU_MX7ULP << 12) | (rom_version & 0xFF);
}
#ifdef CONFIG_REVISION_TAG
u32 __weak get_board_rev(void)
{
return get_cpu_rev();
}
#endif
enum bt_mode get_boot_mode(void)
{
u32 bt0_cfg = 0;
bt0_cfg = readl(CMC0_RBASE + 0x40);
bt0_cfg &= (BT0CFG_LPBOOT_MASK | BT0CFG_DUALBOOT_MASK);
if (!(bt0_cfg & BT0CFG_LPBOOT_MASK)) {
/* No low power boot */
if (bt0_cfg & BT0CFG_DUALBOOT_MASK)
return DUAL_BOOT;
else
return SINGLE_BOOT;
}
return LOW_POWER_BOOT;
}
int arch_cpu_init(void)
{
return 0;
}
#ifdef CONFIG_BOARD_POSTCLK_INIT
int board_postclk_init(void)
{
return 0;
}
#endif
#define UNLOCK_WORD0 0xC520 /* 1st unlock word */
#define UNLOCK_WORD1 0xD928 /* 2nd unlock word */
#define REFRESH_WORD0 0xA602 /* 1st refresh word */
#define REFRESH_WORD1 0xB480 /* 2nd refresh word */
static void disable_wdog(u32 wdog_base)
{
writel(UNLOCK_WORD0, (wdog_base + 0x04));
writel(UNLOCK_WORD1, (wdog_base + 0x04));
writel(0x0, (wdog_base + 0x0C)); /* Set WIN to 0 */
writel(0x400, (wdog_base + 0x08)); /* Set timeout to default 0x400 */
writel(0x120, (wdog_base + 0x00)); /* Disable it and set update */
writel(REFRESH_WORD0, (wdog_base + 0x04)); /* Refresh the CNT */
writel(REFRESH_WORD1, (wdog_base + 0x04));
}
void init_wdog(void)
{
/*
* ROM will configure WDOG1, disable it or enable it
* depending on FUSE. The update bit is set for reconfigurable.
* We have to use unlock sequence to reconfigure it.
* WDOG2 is not touched by ROM, so it will have default value
* which is enabled. We can directly configure it.
* To simplify the codes, we still use same reconfigure
* process as WDOG1. Because the update bit is not set for
* WDOG2, the unlock sequence won't take effect really.
* It actually directly configure the wdog.
* In this function, we will disable both WDOG1 and WDOG2,
* and set update bit for both. So that kernel can reconfigure them.
*/
disable_wdog(WDG1_RBASE);
disable_wdog(WDG2_RBASE);
}
static bool ldo_mode_is_enabled(void)
{
unsigned int reg;
reg = readl(PMC0_BASE_ADDR + PMC0_CTRL);
if (reg & PMC0_CTRL_LDOEN)
return true;
else
return false;
}
#if !defined(CONFIG_SPL) || (defined(CONFIG_SPL) && defined(CONFIG_SPL_BUILD))
#if defined(CONFIG_LDO_ENABLED_MODE)
static void init_ldo_mode(void)
{
unsigned int reg;
if (ldo_mode_is_enabled())
return;
/* Set LDOOKDIS */
setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_LDOOKDIS);
/* Set LDOVL to 0.95V in PMC1_RUN */
reg = readl(PMC1_BASE_ADDR + PMC1_RUN);
reg &= ~PMC1_LDOVL_MASK;
reg |= (PMC1_LDOVL_950 << PMC1_LDOVL_SHIFT);
writel(PMC1_BASE_ADDR + PMC1_RUN, reg);
/* Wait for LDOVLF to be cleared */
reg = readl(PMC1_BASE_ADDR + PMC1_STATUS);
while (reg & PMC1_STATUS_LDOVLF)
;
/* Set LDOVL to 0.95V in PMC1_STOP */
reg = readl(PMC1_BASE_ADDR + PMC1_STOP);
reg &= ~PMC1_LDOVL_MASK;
reg |= (PMC1_LDOVL_950 << PMC1_LDOVL_SHIFT);
writel(PMC1_BASE_ADDR + PMC1_STOP, reg);
/* Set LDOVL to 0.90V in PMC1_VLPS */
reg = readl(PMC1_BASE_ADDR + PMC1_VLPS);
reg &= ~PMC1_LDOVL_MASK;
reg |= (PMC1_LDOVL_900 << PMC1_LDOVL_SHIFT);
writel(PMC1_BASE_ADDR + PMC1_VLPS, reg);
/* Set LDOEN bit */
setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_LDOEN);
/* Set the PMC1ON bit */
setbits_le32(PMC0_BASE_ADDR + PMC0_CTRL, PMC0_CTRL_PMC1ON);
}
#endif
void s_init(void)
{
/* Disable wdog */
init_wdog();
/* clock configuration. */
clock_init();
if (soc_rev() < CHIP_REV_2_0) {
/* enable dumb pmic */
writel((readl(SNVS_LP_LPCR) | SNVS_LPCR_DPEN), SNVS_LP_LPCR);
}
#if defined(CONFIG_LDO_ENABLED_MODE)
init_ldo_mode();
#endif
return;
}
#endif
#ifndef CONFIG_ULP_WATCHDOG
void reset_cpu(void)
{
setbits_le32(SIM0_RBASE, SIM_SOPT1_A7_SW_RESET);
while (1)
;
}
#endif
#if defined(CONFIG_DISPLAY_CPUINFO)
const char *get_imx_type(u32 imxtype)
{
return "7ULP";
}
int print_cpuinfo(void)
{
u32 cpurev;
char cause[18];
cpurev = get_cpu_rev();
printf("CPU: Freescale i.MX%s rev%d.%d at %d MHz\n",
get_imx_type((cpurev & 0xFF000) >> 12),
(cpurev & 0x000F0) >> 4, (cpurev & 0x0000F) >> 0,
mxc_get_clock(MXC_ARM_CLK) / 1000000);
printf("Reset cause: %s\n", get_reset_cause(cause));
printf("Boot mode: ");
switch (get_boot_mode()) {
case LOW_POWER_BOOT:
printf("Low power boot\n");
break;
case DUAL_BOOT:
printf("Dual boot\n");
break;
case SINGLE_BOOT:
default:
printf("Single boot\n");
break;
}
if (ldo_mode_is_enabled())
printf("PMC1: LDO enabled mode\n");
else
printf("PMC1: LDO bypass mode\n");
return 0;
}
#endif
#define CMC_SRS_TAMPER (1 << 31)
#define CMC_SRS_SECURITY (1 << 30)
#define CMC_SRS_TZWDG (1 << 29)
#define CMC_SRS_JTAG_RST (1 << 28)
#define CMC_SRS_CORE1 (1 << 16)
#define CMC_SRS_LOCKUP (1 << 15)
#define CMC_SRS_SW (1 << 14)
#define CMC_SRS_WDG (1 << 13)
#define CMC_SRS_PIN_RESET (1 << 8)
#define CMC_SRS_WARM (1 << 4)
#define CMC_SRS_HVD (1 << 3)
#define CMC_SRS_LVD (1 << 2)
#define CMC_SRS_POR (1 << 1)
#define CMC_SRS_WUP (1 << 0)
static u32 reset_cause = -1;
static char *get_reset_cause(char *ret)
{
u32 cause1, cause = 0, srs = 0;
u32 *reg_ssrs = (u32 *)(SRC_BASE_ADDR + 0x28);
u32 *reg_srs = (u32 *)(SRC_BASE_ADDR + 0x20);
if (!ret)
return "null";
srs = readl(reg_srs);
cause1 = readl(reg_ssrs);
writel(cause1, reg_ssrs);
reset_cause = cause1;
cause = cause1 & (CMC_SRS_POR | CMC_SRS_WUP | CMC_SRS_WARM);
switch (cause) {
case CMC_SRS_POR:
sprintf(ret, "%s", "POR");
break;
case CMC_SRS_WUP:
sprintf(ret, "%s", "WUP");
break;
case CMC_SRS_WARM:
cause = cause1 & (CMC_SRS_WDG | CMC_SRS_SW |
CMC_SRS_JTAG_RST);
switch (cause) {
case CMC_SRS_WDG:
sprintf(ret, "%s", "WARM-WDG");
break;
case CMC_SRS_SW:
sprintf(ret, "%s", "WARM-SW");
break;
case CMC_SRS_JTAG_RST:
sprintf(ret, "%s", "WARM-JTAG");
break;
default:
sprintf(ret, "%s", "WARM-UNKN");
break;
}
break;
default:
sprintf(ret, "%s-%X", "UNKN", cause1);
break;
}
debug("[%X] SRS[%X] %X - ", cause1, srs, srs^cause1);
return ret;
}
#ifdef CONFIG_ENV_IS_IN_MMC
__weak int board_mmc_get_env_dev(int devno)
{
return CONFIG_SYS_MMC_ENV_DEV;
}
int mmc_get_env_dev(void)
{
int devno = 0;
u32 bt1_cfg = 0;
/* If not boot from sd/mmc, use default value */
if (get_boot_mode() == LOW_POWER_BOOT)
return CONFIG_SYS_MMC_ENV_DEV;
bt1_cfg = readl(CMC1_RBASE + 0x40);
devno = (bt1_cfg >> 9) & 0x7;
return board_mmc_get_env_dev(devno);
}
#endif
enum boot_device get_boot_device(void)
{
struct bootrom_sw_info **p =
(struct bootrom_sw_info **)ROM_SW_INFO_ADDR;
enum boot_device boot_dev = SD1_BOOT;
u8 boot_type = (*p)->boot_dev_type;
u8 boot_instance = (*p)->boot_dev_instance;
switch (boot_type) {
case BOOT_TYPE_SD:
boot_dev = boot_instance + SD1_BOOT;
break;
case BOOT_TYPE_MMC:
boot_dev = boot_instance + MMC1_BOOT;
break;
case BOOT_TYPE_USB:
boot_dev = USB_BOOT;
break;
default:
break;
}
return boot_dev;
}
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