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// SPDX-License-Identifier: GPL-2.0
#include <io.h>
#include <common.h>
#include <debug_ll.h>
#include <firmware.h>
#include <asm/mmu.h>
#include <asm/cache.h>
#include <asm/sections.h>
#include <asm/barebox-arm.h>
#include <asm/barebox-arm-head.h>
#include <i2c/i2c-early.h>
#include <linux/sizes.h>
#include <mach/atf.h>
#include <mach/xload.h>
#include <mach/esdctl.h>
#include <mach/generic.h>
#include <mach/imx8mp-regs.h>
#include <mach/iomux-mx8mp.h>
#include <mach/imx8m-ccm-regs.h>
#include <mfd/pca9450.h>
#include <soc/imx8m/ddr.h>
#include <soc/fsl/fsl_udc.h>
extern char __dtb_imx8mp_evk_start[];
#define UART_PAD_CTRL MUX_PAD_CTRL(MX8MP_PAD_CTL_DSE6 | \
MX8MP_PAD_CTL_FSEL)
#define I2C_PAD_CTRL MUX_PAD_CTRL(MX8MP_PAD_CTL_DSE6 | \
MX8MP_PAD_CTL_HYS | \
MX8MP_PAD_CTL_PUE | \
MX8MP_PAD_CTL_PE)
static void setup_uart(void)
{
void __iomem *uart = IOMEM(MX8M_UART2_BASE_ADDR);
imx8m_early_setup_uart_clock();
imx8mp_setup_pad(MX8MP_PAD_UART2_TXD__UART2_DCE_TX | UART_PAD_CTRL);
imx8mp_setup_pad(MX8MP_PAD_UART2_RXD__UART2_DCE_RX | UART_PAD_CTRL);
imx8m_uart_setup(uart);
pbl_set_putc(imx_uart_putc, uart);
putc_ll('>');
}
static void pmic_reg_write(void *i2c, int reg, uint8_t val)
{
int ret;
u8 buf[32];
struct i2c_msg msgs[] = {
{
.addr = 0x25,
.buf = buf,
},
};
buf[0] = reg;
buf[1] = val;
msgs[0].len = 2;
ret = i2c_fsl_xfer(i2c, msgs, ARRAY_SIZE(msgs));
if (ret != 1)
pr_err("Failed to write to pmic\n");
}
static int power_init_board(void)
{
void *i2c;
imx8mp_setup_pad(MX8MP_PAD_I2C1_SCL__I2C1_SCL | I2C_PAD_CTRL);
imx8mp_setup_pad(MX8MP_PAD_I2C1_SDA__I2C1_SDA | I2C_PAD_CTRL);
imx8mm_early_clock_init();
imx8m_ccgr_clock_enable(IMX8M_CCM_CCGR_I2C1);
i2c = imx8m_i2c_early_init(IOMEM(MX8MP_I2C1_BASE_ADDR));
/* BUCKxOUT_DVS0/1 control BUCK123 output */
pmic_reg_write(i2c, PCA9450_BUCK123_DVS, 0x29);
/*
* increase VDD_SOC to typical value 0.95V before first
* DRAM access, set DVS1 to 0.85v for suspend.
* Enable DVS control through PMIC_STBY_REQ and
* set B1_ENMODE=1 (ON by PMIC_ON_REQ=H)
*/
pmic_reg_write(i2c, PCA9450_BUCK1OUT_DVS0, 0x1C);
pmic_reg_write(i2c, PCA9450_BUCK1OUT_DVS1, 0x14);
pmic_reg_write(i2c, PCA9450_BUCK1CTRL, 0x59);
/* set WDOG_B_CFG to cold reset */
pmic_reg_write(i2c, PCA9450_RESET_CTRL, 0xA1);
return 0;
}
extern struct dram_timing_info imx8mp_evk_dram_timing;
static void start_atf(void)
{
size_t bl31_size;
const u8 *bl31;
enum bootsource src;
int instance;
/*
* If we are in EL3 we are running for the first time and need to
* initialize the DRAM and run TF-A (BL31). The TF-A will then jump
* to DRAM in EL2.
*/
if (current_el() != 3)
return;
power_init_board();
imx8mp_ddr_init(&imx8mp_evk_dram_timing);
imx8mp_get_boot_source(&src, &instance);
switch (src) {
case BOOTSOURCE_MMC:
imx8mp_esdhc_load_image(instance, false);
break;
default:
printf("Unhandled bootsource BOOTSOURCE_%d\n", src);
hang();
}
/*
* On completion the TF-A will jump to MX8M_ATF_BL33_BASE_ADDR
* in EL2. Copy the image there, but replace the PBL part of
* that image with ourselves. On a high assurance boot only the
* currently running code is validated and contains the checksum
* for the piggy data, so we need to ensure that we are running
* the same code in DRAM.
*/
memcpy((void *)MX8M_ATF_BL33_BASE_ADDR,
__image_start, barebox_pbl_size);
get_builtin_firmware(imx8mp_bl31_bin, &bl31, &bl31_size);
imx8mp_atf_load_bl31(bl31, bl31_size);
/* not reached */
}
/*
* Power-on execution flow of start_nxp_imx8mp_evk() might not be
* obvious for a very first read, so here's, hopefully helpful,
* summary:
*
* 1. MaskROM uploads PBL into OCRAM and that's where this function is
* executed for the first time. At entry the exception level is EL3.
*
* 2. DDR is initialized and the image is loaded from storage into DRAM. The PBL
* part is copied from OCRAM to the TF-A return address in DRAM.
*
* 3. TF-A is executed and exits into the PBL code in DRAM. TF-A has taken us
* from EL3 to EL2.
*
* 4. Standard barebox boot flow continues
*/
static __noreturn noinline void nxp_imx8mp_evk_start(void)
{
setup_uart();
start_atf();
/*
* Standard entry we hit once we initialized both DDR and ATF
*/
imx8mp_barebox_entry(__dtb_imx8mp_evk_start);
}
ENTRY_FUNCTION(start_nxp_imx8mp_evk, r0, r1, r2)
{
void __iomem *ccm = IOMEM(MX8M_CCM_BASE_ADDR);
writel(IMX8M_CCM_CCGR_SETTINGn_NEEDED(0),
ccm + IMX8M_CCM_CCGRn_SET(IMX8M_CCM_CCGR_SCTR));
imx8mp_cpu_lowlevel_init();
relocate_to_current_adr();
setup_c();
nxp_imx8mp_evk_start();
}
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