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sunxi-tools/uart0-helloworld-sdboot.c

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2023-10-20 19:54:56 +08:00
/*
* Copyright (C) 2016 Siarhei Siamashka <siarhei.siamashka@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Partially based on the uart code from ar100-info
*
* (C) Copyright 2013 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* Partially based on the sunxi gpio code from U-Boot
*
* (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
*
* Based on earlier arch/arm/cpu/armv7/sunxi/gpio.c:
*
* (C) Copyright 2007-2011
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
typedef unsigned int u32;
#define set_wbit(addr, v) (*((volatile unsigned long *)(addr)) |= (unsigned long)(v))
#define readl(addr) (*((volatile unsigned long *)(addr)))
#define writel(v, addr) (*((volatile unsigned long *)(addr)) = (unsigned long)(v))
#define SUNXI_UART0_BASE 0x01C28000
#define SUNXI_PIO_BASE 0x01C20800
#define AW_CCM_BASE 0x01c20000
#define AW_SRAMCTRL_BASE 0x01c00000
#define H6_UART0_BASE 0x05000000
#define H6_PIO_BASE 0x0300B000
#define H6_CCM_BASE 0x03001000
#define H6_SRAMCTRL_BASE 0x03000000
#define R329_UART0_BASE 0x02500000
#define R329_PIO_BASE 0x02000400
#define R329_CCM_BASE 0x02001000
#define V853_PIO_BASE 0x02000000
#define SUNIV_UART0_BASE 0x01c25000
/*****************************************************************************
* GPIO code, borrowed from U-Boot *
*****************************************************************************/
#define SUNXI_GPIO_A 0
#define SUNXI_GPIO_B 1
#define SUNXI_GPIO_C 2
#define SUNXI_GPIO_D 3
#define SUNXI_GPIO_E 4
#define SUNXI_GPIO_F 5
#define SUNXI_GPIO_G 6
#define SUNXI_GPIO_H 7
#define SUNXI_GPIO_I 8
#define GPIO_BANK(pin) ((pin) >> 5)
#define GPIO_NUM(pin) ((pin) & 0x1F)
#define GPIO_CFG_BASE(bank) ((u32 *)(pio_base + (bank) * pio_bank_size))
#define GPIO_CFG_INDEX(pin) (((pin) & 0x1F) >> 3)
#define GPIO_CFG_OFFSET(pin) ((((pin) & 0x1F) & 0x7) << 2)
#define GPIO_PULL_BASE(bank) ((u32 *)(pio_base + (bank) * pio_bank_size + pio_pull_off))
#define GPIO_PULL_INDEX(pin) (((pin) & 0x1f) >> 4)
#define GPIO_PULL_OFFSET(pin) ((((pin) & 0x1f) & 0xf) << 1)
#define GPIO_DAT_BASE(bank) ((u32 *)(pio_base + (bank) * pio_bank_size + pio_dat_off))
/* GPIO bank sizes */
#define SUNXI_GPIO_A_NR (32)
#define SUNXI_GPIO_B_NR (32)
#define SUNXI_GPIO_C_NR (32)
#define SUNXI_GPIO_D_NR (32)
#define SUNXI_GPIO_E_NR (32)
#define SUNXI_GPIO_F_NR (32)
#define SUNXI_GPIO_G_NR (32)
#define SUNXI_GPIO_H_NR (32)
#define SUNXI_GPIO_I_NR (32)
#define SUNXI_GPIO_NEXT(__gpio) ((__gpio##_START) + (__gpio##_NR) + 0)
enum sunxi_gpio_number {
SUNXI_GPIO_A_START = 0,
SUNXI_GPIO_B_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_A),
SUNXI_GPIO_C_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_B),
SUNXI_GPIO_D_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_C),
SUNXI_GPIO_E_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_D),
SUNXI_GPIO_F_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_E),
SUNXI_GPIO_G_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_F),
SUNXI_GPIO_H_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_G),
SUNXI_GPIO_I_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_H),
};
/* SUNXI GPIO number definitions */
#define SUNXI_GPA(_nr) (SUNXI_GPIO_A_START + (_nr))
#define SUNXI_GPB(_nr) (SUNXI_GPIO_B_START + (_nr))
#define SUNXI_GPC(_nr) (SUNXI_GPIO_C_START + (_nr))
#define SUNXI_GPD(_nr) (SUNXI_GPIO_D_START + (_nr))
#define SUNXI_GPE(_nr) (SUNXI_GPIO_E_START + (_nr))
#define SUNXI_GPF(_nr) (SUNXI_GPIO_F_START + (_nr))
#define SUNXI_GPG(_nr) (SUNXI_GPIO_G_START + (_nr))
#define SUNXI_GPH(_nr) (SUNXI_GPIO_H_START + (_nr))
#define SUNXI_GPI(_nr) (SUNXI_GPIO_I_START + (_nr))
/* GPIO pin function config */
#define SUNXI_GPIO_INPUT (0)
#define SUNXI_GPIO_OUTPUT (1)
#define SUNIV_GPE_UART0 (5)
#define SUN4I_GPB_UART0 (2)
#define SUN5I_GPB_UART0 (2)
#define SUN6I_GPH_UART0 (2)
#define SUN8I_H3_GPA_UART0 (2)
#define SUN8I_R528_GPE_UART0 (6)
#define SUN8I_V3S_GPB_UART0 (3)
#define SUN8I_V5_GPB_UART0 (2)
#define SUN8I_V831_GPH_UART0 (5)
#define SUN8I_V853_GPH_UART0 (5)
#define SUN50I_H5_GPA_UART0 (2)
#define SUN50I_H6_GPH_UART0 (2)
#define SUN50I_H616_GPH_UART0 (2)
#define SUN50I_R329_GPB_UART0 (2)
#define SUN50I_A64_GPB_UART0 (4)
#define SUNXI_GPF_UART0 (4)
/* GPIO pin pull-up/down config */
#define SUNXI_GPIO_PULL_DISABLE (0)
#define SUNXI_GPIO_PULL_UP (1)
#define SUNXI_GPIO_PULL_DOWN (2)
static u32 pio_base;
static u32 pio_bank_size, pio_dat_off, pio_pull_off;
int sunxi_gpio_set_cfgpin(u32 pin, u32 val)
{
u32 cfg;
u32 bank = GPIO_BANK(pin);
u32 index = GPIO_CFG_INDEX(pin);
u32 offset = GPIO_CFG_OFFSET(pin);
u32 *addr = GPIO_CFG_BASE(bank) + index;
cfg = readl(addr);
cfg &= ~(0xf << offset);
cfg |= val << offset;
writel(cfg, addr);
return 0;
}
int sunxi_gpio_set_pull(u32 pin, u32 val)
{
u32 cfg;
u32 bank = GPIO_BANK(pin);
u32 index = GPIO_PULL_INDEX(pin);
u32 offset = GPIO_PULL_OFFSET(pin);
u32 *addr = GPIO_PULL_BASE(bank) + index;
cfg = readl(addr);
cfg &= ~(0x3 << offset);
cfg |= val << offset;
writel(cfg, addr);
return 0;
}
int sunxi_gpio_output(u32 pin, u32 val)
{
u32 dat;
u32 bank = GPIO_BANK(pin);
u32 num = GPIO_NUM(pin);
u32 *addr = GPIO_DAT_BASE(bank);
dat = readl(addr);
if(val)
dat |= 1 << num;
else
dat &= ~(1 << num);
writel(dat, addr);
return 0;
}
int sunxi_gpio_input(u32 pin)
{
u32 dat;
u32 bank = GPIO_BANK(pin);
u32 num = GPIO_NUM(pin);
u32 *addr = GPIO_DAT_BASE(bank);
dat = readl(addr);
dat >>= num;
return (dat & 0x1);
}
int gpio_direction_input(unsigned gpio)
{
sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);
return sunxi_gpio_input(gpio);
}
int gpio_direction_output(unsigned gpio, int value)
{
sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);
return sunxi_gpio_output(gpio, value);
}
/*****************************************************************************
* Nearly all the Allwinner SoCs are using the same VER_REG register for *
* runtime SoC type identification. For additional details see: *
* *
* https://linux-sunxi.org/SRAM_Controller_Register_Guide *
* *
* Allwinner A80 is an oddball and has a non-standard address of the VER_REG *
* *
* Allwinner A10s and A13 are using the same SoC type id, but they can be *
* differentiated using a certain part of the SID register. *
* *
* Allwinner H6 has its memory map totally reworked, but the SRAM controller *
* remains similar; the base of it is moved to 0x03000000. *
*****************************************************************************/
#define VER_REG (AW_SRAMCTRL_BASE + 0x24)
#define H6_VER_REG (H6_SRAMCTRL_BASE + 0x24)
#define SUN4I_SID_BASE 0x01C23800
#define SUN8I_SID_BASE 0x01C14000
#define SID_PRCTL 0x40 /* SID program/read control register */
#define SID_RDKEY 0x60 /* SID read key value register */
#define SID_OP_LOCK 0xAC /* Efuse operation lock value */
#define SID_READ_START (1 << 1) /* bit 1 of SID_PRCTL, Software Read Start */
u32 sid_read_key(u32 sid_base, u32 offset)
{
u32 reg_val;
reg_val = (offset & 0x1FF) << 16; /* PG_INDEX value */
reg_val |= (SID_OP_LOCK << 8) | SID_READ_START; /* request read access */
writel(reg_val, sid_base + SID_PRCTL);
while (readl(sid_base + SID_PRCTL) & SID_READ_START) ; /* wait while busy */
reg_val = readl(sid_base + SID_RDKEY); /* read SID key value */
writel(0, sid_base + SID_PRCTL); /* clear SID_PRCTL (removing SID_OP_LOCK) */
return reg_val;
}
static u32 soc_id;
void soc_detection_init(void)
{
u32 midr;
asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r" (midr));
if (((midr >> 4) & 0xFFF) == 0xC0F) {
soc_id = 0x1639; /* ARM Cortex-A15, so likely Allwinner A80 */
} else {
u32 reg;
/*
* This register is GICD_IIDR on H6, but unmapped according to
* other known SoCs' user manuals.
*/
reg = readl(0x03021008);
if ((reg & 0xfff) == 0x43b) /* Found GICv2 here, so it's a H6 */
reg = H6_VER_REG;
else
reg = VER_REG;
set_wbit(reg, 1 << 15);
soc_id = readl(reg) >> 16;
}
}
/* Most SoCs can reliably be distinguished by simply checking their ID value */
#define soc_is_a10() (soc_id == 0x1623)
#define soc_is_a20() (soc_id == 0x1651)
#define soc_is_a31() (soc_id == 0x1633)
#define soc_is_a80() (soc_id == 0x1639)
#define soc_is_a64() (soc_id == 0x1689)
#define soc_is_h5() (soc_id == 0x1718)
#define soc_is_a63() (soc_id == 0x1719)
#define soc_is_h6() (soc_id == 0x1728)
#define soc_is_h616() (soc_id == 0x1823)
#define soc_is_r329() (soc_id == 0x1851)
#define soc_is_r40() (soc_id == 0x1701)
#define soc_is_v3s() (soc_id == 0x1681)
#define soc_is_v831() (soc_id == 0x1817)
#define soc_is_v853() (soc_id == 0x1886)
#define soc_is_r528() (soc_id == 0x1859)
#define soc_is_v5() (soc_id == 0x1721)
#define soc_is_suniv() (soc_id == 0x1663)
/* A10s and A13 share the same ID, so we need a little more effort on those */
int soc_is_a10s(void)
{
return soc_id == 0x1625 &&
(readl(SUN4I_SID_BASE + 8) & 0xf000) == 0x7000;
}
int soc_is_a13(void)
{
return soc_id == 0x1625 &&
(readl(SUN4I_SID_BASE + 8) & 0xf000) != 0x7000;
}
/* H2+ and H3 share the same ID, we can differentiate them by SID_RKEY0 */
int soc_is_h2_plus(void)
{
if (soc_id != 0x1680) return 0;
u32 sid0 = sid_read_key(SUN8I_SID_BASE, 0);
return (sid0 & 0xff) == 0x42 || (sid0 & 0xff) == 0x83;
}
int soc_is_h3(void)
{
if (soc_id != 0x1680) return 0;
u32 sid0 = sid_read_key(SUN8I_SID_BASE, 0);
/*
* Note: according to Allwinner sources, H3 is expected
* to show up as 0x00, 0x81 or ("H3D") 0x58 here.
*/
return (sid0 & 0xff) != 0x42 && (sid0 & 0xff) != 0x83;
}
/*****************************************************************************
* UART is mostly the same on A10/A13/A20/A31/H3/A64, except that newer SoCs *
* have changed the APB numbering scheme (A10/A13/A20 used to have APB0 and *
* APB1 names, but newer SoCs just have renamed them into APB1 and APB2). *
* The constants below are using the new APB numbering convention. *
* Also the newer SoCs have introduced the APB2_RESET register, but writing *
* to it effectively goes nowhere on older SoCs and is harmless. *
*****************************************************************************/
#define CONFIG_CONS_INDEX 1
#define APB2_CFG (AW_CCM_BASE + 0x058)
#define APB1_GATE (AW_CCM_BASE + 0x068)
#define APB2_GATE (AW_CCM_BASE + 0x06C)
#define APB1_RESET (AW_CCM_BASE + 0x2D0)
#define APB2_RESET (AW_CCM_BASE + 0x2D8)
#define APB2_GATE_UART_SHIFT (16)
#define APB1_GATE_UART_SHIFT 20
#define APB2_RESET_UART_SHIFT (16)
#define APB1_RESET_UART_SHIFT 20
#define H6_UART_GATE_RESET (H6_CCM_BASE + 0x90C)
#define R329_UART_GATE_RESET (R329_CCM_BASE + 0x90C)
#define H6_UART_GATE_SHIFT (0)
#define H6_UART_RESET_SHIFT (16)
void clock_init_uart_legacy(void)
{
/* Open the clock gate for UART0 */
set_wbit(APB2_GATE, 1 << (APB2_GATE_UART_SHIFT + CONFIG_CONS_INDEX - 1));
/* Deassert UART0 reset (only needed on A31/A64/H3) */
set_wbit(APB2_RESET, 1 << (APB2_RESET_UART_SHIFT + CONFIG_CONS_INDEX - 1));
}
void clock_init_uart_suniv(void)
{
/* open the clock for uart */
set_wbit(APB1_GATE,
1U << (APB1_GATE_UART_SHIFT + CONFIG_CONS_INDEX - 1));
/* deassert uart reset */
set_wbit(APB1_RESET,
1U << (APB1_RESET_UART_SHIFT + CONFIG_CONS_INDEX - 1));
}
void clock_init_uart_h6(void)
{
/* Open the clock gate for UART0 */
set_wbit(H6_UART_GATE_RESET, 1 << (H6_UART_GATE_SHIFT + CONFIG_CONS_INDEX - 1));
/* Deassert UART0 reset */
set_wbit(H6_UART_GATE_RESET, 1 << (H6_UART_RESET_SHIFT + CONFIG_CONS_INDEX - 1));
}
void clock_init_uart_r329(void)
{
/* Open the clock gate for UART0 */
set_wbit(R329_UART_GATE_RESET, 1 << (H6_UART_GATE_SHIFT + CONFIG_CONS_INDEX - 1));
/* Deassert UART0 reset */
set_wbit(R329_UART_GATE_RESET, 1 << (H6_UART_RESET_SHIFT + CONFIG_CONS_INDEX - 1));
}
void clock_init_uart(void)
{
if (soc_is_h6() || soc_is_v831() || soc_is_h616() || soc_is_v5() ||
soc_is_a63())
clock_init_uart_h6();
else if (soc_is_r329() || soc_is_v853() || soc_is_r528())
clock_init_uart_r329();
else if (soc_is_suniv())
clock_init_uart_suniv();
else
clock_init_uart_legacy();
}
/*****************************************************************************
* UART0 pins muxing is different for different SoC variants. *
* Allwinner A13 is a bit special, because there are no dedicated UART0 pins *
* and they are shared with MMC0. *
*****************************************************************************/
void gpio_init(void)
{
if (soc_is_v853() || soc_is_r528()) {
/* GPIO V2 */
pio_bank_size = 0x30;
pio_dat_off = 0x10;
pio_pull_off = 0x24;
} else {
/* GPIO V1 */
pio_bank_size = 0x24;
pio_dat_off = 0x10;
pio_pull_off = 0x1c;
}
if (soc_is_a10() || soc_is_a20() || soc_is_r40()) {
sunxi_gpio_set_cfgpin(SUNXI_GPB(22), SUN4I_GPB_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPB(23), SUN4I_GPB_UART0);
sunxi_gpio_set_pull(SUNXI_GPB(23), SUNXI_GPIO_PULL_UP);
} else if (soc_is_a10s()) {
sunxi_gpio_set_cfgpin(SUNXI_GPB(19), SUN5I_GPB_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPB(20), SUN5I_GPB_UART0);
sunxi_gpio_set_pull(SUNXI_GPB(20), SUNXI_GPIO_PULL_UP);
} else if (soc_is_a13()) {
/* Disable PB19/PB20 as UART0 to avoid conflict */
gpio_direction_input(SUNXI_GPB(19));
gpio_direction_input(SUNXI_GPB(20));
/* Use SD breakout board to access UART0 on MMC0 pins */
sunxi_gpio_set_cfgpin(SUNXI_GPF(2), SUNXI_GPF_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPF(4), SUNXI_GPF_UART0);
sunxi_gpio_set_pull(SUNXI_GPF(4), SUNXI_GPIO_PULL_UP);
} else if (soc_is_a31()) {
sunxi_gpio_set_cfgpin(SUNXI_GPH(20), SUN6I_GPH_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPH(21), SUN6I_GPH_UART0);
sunxi_gpio_set_pull(SUNXI_GPH(21), SUNXI_GPIO_PULL_UP);
} else if (soc_is_a64()) {
sunxi_gpio_set_cfgpin(SUNXI_GPB(8), SUN50I_A64_GPB_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPB(9), SUN50I_A64_GPB_UART0);
sunxi_gpio_set_pull(SUNXI_GPB(9), SUNXI_GPIO_PULL_UP);
} else if (soc_is_h3() || soc_is_h2_plus()) {
sunxi_gpio_set_cfgpin(SUNXI_GPA(4), SUN8I_H3_GPA_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPA(5), SUN8I_H3_GPA_UART0);
sunxi_gpio_set_pull(SUNXI_GPA(5), SUNXI_GPIO_PULL_UP);
} else if (soc_is_h5()) {
sunxi_gpio_set_cfgpin(SUNXI_GPA(4), SUN50I_H5_GPA_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPA(5), SUN50I_H5_GPA_UART0);
sunxi_gpio_set_pull(SUNXI_GPA(5), SUNXI_GPIO_PULL_UP);
} else if (soc_is_a63()) {
sunxi_gpio_set_cfgpin(SUNXI_GPB(9), SUN50I_A64_GPB_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPB(10), SUN50I_A64_GPB_UART0);
sunxi_gpio_set_pull(SUNXI_GPB(10), SUNXI_GPIO_PULL_UP);
} else if (soc_is_h6()) {
sunxi_gpio_set_cfgpin(SUNXI_GPH(0), SUN50I_H6_GPH_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPH(1), SUN50I_H6_GPH_UART0);
sunxi_gpio_set_pull(SUNXI_GPH(1), SUNXI_GPIO_PULL_UP);
} else if (soc_is_h616()) {
sunxi_gpio_set_cfgpin(SUNXI_GPH(0), SUN50I_H616_GPH_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPH(1), SUN50I_H616_GPH_UART0);
sunxi_gpio_set_pull(SUNXI_GPH(1), SUNXI_GPIO_PULL_UP);
} else if (soc_is_r329()) {
sunxi_gpio_set_cfgpin(SUNXI_GPB(4), SUN50I_R329_GPB_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPB(5), SUN50I_R329_GPB_UART0);
sunxi_gpio_set_pull(SUNXI_GPB(5), SUNXI_GPIO_PULL_UP);
} else if (soc_is_v3s()) {
sunxi_gpio_set_cfgpin(SUNXI_GPB(8), SUN8I_V3S_GPB_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPB(9), SUN8I_V3S_GPB_UART0);
sunxi_gpio_set_pull(SUNXI_GPB(9), SUNXI_GPIO_PULL_UP);
} else if (soc_is_v831()) {
sunxi_gpio_set_cfgpin(SUNXI_GPH(9), SUN8I_V831_GPH_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPH(10), SUN8I_V831_GPH_UART0);
sunxi_gpio_set_pull(SUNXI_GPH(10), SUNXI_GPIO_PULL_UP);
} else if (soc_is_v853()) {
sunxi_gpio_set_cfgpin(SUNXI_GPH(9), SUN8I_V853_GPH_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPH(10), SUN8I_V853_GPH_UART0);
sunxi_gpio_set_pull(SUNXI_GPH(10), SUNXI_GPIO_PULL_UP);
} else if (soc_is_r528()) {
sunxi_gpio_set_cfgpin(SUNXI_GPE(2), SUN8I_R528_GPE_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPE(3), SUN8I_R528_GPE_UART0);
sunxi_gpio_set_pull(SUNXI_GPE(3), SUNXI_GPIO_PULL_UP);
} else if (soc_is_v5()) {
sunxi_gpio_set_cfgpin(SUNXI_GPB(9), SUN8I_V5_GPB_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPB(10), SUN8I_V5_GPB_UART0);
sunxi_gpio_set_pull(SUNXI_GPB(10), SUNXI_GPIO_PULL_UP);
} else if (soc_is_suniv()) {
sunxi_gpio_set_cfgpin(SUNXI_GPE(0), SUNIV_GPE_UART0);
sunxi_gpio_set_cfgpin(SUNXI_GPE(1), SUNIV_GPE_UART0);
sunxi_gpio_set_pull(SUNXI_GPE(1), SUNXI_GPIO_PULL_UP);
} else {
/* Unknown SoC */
while (1) {}
}
}
/*****************************************************************************/
static u32 uart0_base;
#define UART0_RBR (uart0_base + 0x0) /* receive buffer register */
#define UART0_THR (uart0_base + 0x0) /* transmit holding register */
#define UART0_DLL (uart0_base + 0x0) /* divisor latch low register */
#define UART0_DLH (uart0_base + 0x4) /* divisor latch high register */
#define UART0_IER (uart0_base + 0x4) /* interrupt enable reigster */
#define UART0_IIR (uart0_base + 0x8) /* interrupt identity register */
#define UART0_FCR (uart0_base + 0x8) /* fifo control register */
#define UART0_LCR (uart0_base + 0xc) /* line control register */
#define UART0_LSR (uart0_base + 0x14) /* line status register */
#define BAUD_115200 13 /* 24 * 1000 * 1000 / 16 / 115200 */
/* The BROM sets the CPU clock to 204MHz, AHB=CPU/2, APB=AHB/2 => 51 MHz */
#define BAUD_115200_SUNIV 28 /* 51 * 1000 * 1000 / 16 / 115200 */
#define NO_PARITY (0)
#define ONE_STOP_BIT (0)
#define DAT_LEN_8_BITS (3)
#define LC_8_N_1 (NO_PARITY << 3 | ONE_STOP_BIT << 2 | DAT_LEN_8_BITS)
void uart0_init(void)
{
clock_init_uart();
/* select dll dlh */
writel(0x80, UART0_LCR);
/* set baudrate */
writel(0, UART0_DLH);
if (soc_is_suniv())
writel(BAUD_115200_SUNIV, UART0_DLL);
else
writel(BAUD_115200, UART0_DLL);
/* set line control */
writel(LC_8_N_1, UART0_LCR);
}
void uart0_putc(char c)
{
while (!(readl(UART0_LSR) & (1 << 6))) {}
writel(c, UART0_THR);
}
void uart0_puts(const char *s)
{
while (*s) {
if (*s == '\n')
uart0_putc('\r');
uart0_putc(*s++);
}
}
/*****************************************************************************/
/* A workaround for https://patchwork.ozlabs.org/patch/622173 */
void __attribute__((section(".start"))) __attribute__((naked)) start(void)
{
asm volatile("b main \n"
".long 0xffffffff \n"
".long 0xffffffff \n"
".long 0xffffffff \n");
}
enum { BOOT_DEVICE_UNK, BOOT_DEVICE_FEL, BOOT_DEVICE_MMC0, BOOT_DEVICE_SPI };
int get_boot_device(void)
{
u32 *spl_signature = (void *)0x4;
if (soc_is_a64() || soc_is_a80() || soc_is_h5())
spl_signature = (void *)0x10004;
if (soc_is_h6() || soc_is_v831() || soc_is_h616() || soc_is_v853() ||
soc_is_a63())
spl_signature = (void *)0x20004;
if (soc_is_r329())
spl_signature = (void *)0x100004;
/* Check the eGON.BT0 magic in the SPL header */
if (spl_signature[0] != 0x4E4F4765 || spl_signature[1] != 0x3054422E)
return BOOT_DEVICE_FEL;
u32 boot_dev = spl_signature[9] & 0xFF; /* offset into SPL = 0x28 */
if (boot_dev == 0)
return BOOT_DEVICE_MMC0;
if (boot_dev == 3)
return BOOT_DEVICE_SPI;
return BOOT_DEVICE_UNK;
}
void bases_init(void)
{
if (soc_is_h6() || soc_is_v831() || soc_is_h616() || soc_is_v5() ||
soc_is_a63()) {
pio_base = H6_PIO_BASE;
uart0_base = H6_UART0_BASE;
} else if (soc_is_r329()) {
pio_base = R329_PIO_BASE;
uart0_base = R329_UART0_BASE;
} else if (soc_is_v853() || soc_is_r528()) {
pio_base = V853_PIO_BASE;
uart0_base = R329_UART0_BASE;
} else if (soc_is_suniv()) {
pio_base = SUNXI_PIO_BASE;
uart0_base = SUNIV_UART0_BASE;
} else {
pio_base = SUNXI_PIO_BASE;
uart0_base = SUNXI_UART0_BASE;
}
}
int main(void)
{
soc_detection_init();
bases_init();
gpio_init();
uart0_init();
uart0_puts("\nHello from ");
if (soc_is_a10())
uart0_puts("Allwinner A10!\n");
else if (soc_is_a10s())
uart0_puts("Allwinner A10s!\n");
else if (soc_is_a13())
uart0_puts("Allwinner A13!\n");
else if (soc_is_a20())
uart0_puts("Allwinner A20!\n");
else if (soc_is_a31())
uart0_puts("Allwinner A31/A31s!\n");
else if (soc_is_a64())
uart0_puts("Allwinner A64!\n");
else if (soc_is_h2_plus())
uart0_puts("Allwinner H2+!\n");
else if (soc_is_h3())
uart0_puts("Allwinner H3!\n");
else if (soc_is_h5())
uart0_puts("Allwinner H5!\n");
else if (soc_is_a63())
uart0_puts("Allwinner A63!\n");
else if (soc_is_h6())
uart0_puts("Allwinner H6!\n");
else if (soc_is_h616())
uart0_puts("Allwinner H616!\n");
else if (soc_is_r329())
uart0_puts("Allwinner R329!\n");
else if (soc_is_r40())
uart0_puts("Allwinner R40!\n");
else if (soc_is_v3s())
uart0_puts("Allwinner V3s!\n");
else if (soc_is_v831())
uart0_puts("Allwinner V831!\n");
else if (soc_is_v853())
uart0_puts("Allwinner V853!\n");
else if (soc_is_r528())
uart0_puts("Allwinner R528/T113!\n");
else if (soc_is_v5())
uart0_puts("Allwinner V5!\n");
else if (soc_is_suniv())
uart0_puts("Allwinner F1C100s!\n");
else
uart0_puts("unknown Allwinner SoC!\n");
switch (get_boot_device()) {
case BOOT_DEVICE_FEL:
uart0_puts("Returning back to FEL.\n");
return 0;
case BOOT_DEVICE_MMC0:
uart0_puts("Booted from MMC0, entering an infinite loop.\n");
while (1) {}
case BOOT_DEVICE_SPI:
uart0_puts("Booted from SPI0, entering an infinite loop.\n");
while (1) {}
default:
uart0_puts("Booted from unknown media, entering an infinite loop.\n");
while (1) {}
};
return 0;
}
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