/* * Copyright (C) 2016 Siarhei Siamashka * * 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 . */ /* * Partially based on the uart code from ar100-info * * (C) Copyright 2013 Stefan Kristiansson * * 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 * * Based on earlier arch/arm/cpu/armv7/sunxi/gpio.c: * * (C) Copyright 2007-2011 * Allwinner Technology Co., Ltd. * Tom Cubie * * 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 /***************************************************************************** * 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 struct sunxi_gpio { u32 cfg[4]; u32 dat; u32 drv[2]; u32 pull[2]; }; struct sunxi_gpio_reg { struct sunxi_gpio gpio_bank[10]; }; #define GPIO_BANK(pin) ((pin) >> 5) #define GPIO_NUM(pin) ((pin) & 0x1F) #define GPIO_CFG_INDEX(pin) (((pin) & 0x1F) >> 3) #define GPIO_CFG_OFFSET(pin) ((((pin) & 0x1F) & 0x7) << 2) #define GPIO_PULL_INDEX(pin) (((pin) & 0x1f) >> 4) #define GPIO_PULL_OFFSET(pin) ((((pin) & 0x1f) & 0xf) << 1) /* 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 SUN4I_GPB_UART0 (2) #define SUN5I_GPB_UART0 (2) #define SUN6I_GPH_UART0 (2) #define SUN8I_H3_GPA_UART0 (2) #define SUN8I_V3S_GPB_UART0 (3) #define SUN50I_H5_GPA_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) 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); struct sunxi_gpio *pio = &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]; cfg = readl(&pio->cfg[0] + index); cfg &= ~(0xf << offset); cfg |= val << offset; writel(cfg, &pio->cfg[0] + index); 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); struct sunxi_gpio *pio = &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]; cfg = readl(&pio->pull[0] + index); cfg &= ~(0x3 << offset); cfg |= val << offset; writel(cfg, &pio->pull[0] + index); return 0; } int sunxi_gpio_output(u32 pin, u32 val) { u32 dat; u32 bank = GPIO_BANK(pin); u32 num = GPIO_NUM(pin); struct sunxi_gpio *pio = &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]; dat = readl(&pio->dat); if(val) dat |= 1 << num; else dat &= ~(1 << num); writel(dat, &pio->dat); return 0; } int sunxi_gpio_input(u32 pin) { u32 dat; u32 bank = GPIO_BANK(pin); u32 num = GPIO_NUM(pin); struct sunxi_gpio *pio = &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]; dat = readl(&pio->dat); 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. * *****************************************************************************/ #define VER_REG (AW_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 { set_wbit(VER_REG, 1 << 15); soc_id = readl(VER_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_r40() (soc_id == 0x1701) #define soc_is_v3s() (soc_id == 0x1681) /* 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 APB2_GATE (AW_CCM_BASE + 0x06C) #define APB2_RESET (AW_CCM_BASE + 0x2D8) #define APB2_GATE_UART_SHIFT (16) #define APB2_RESET_UART_SHIFT (16) void clock_init_uart(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)); } /***************************************************************************** * 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_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_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 { /* Unknown SoC */ while (1) {} } } /*****************************************************************************/ #define UART0_RBR (SUNXI_UART0_BASE + 0x0) /* receive buffer register */ #define UART0_THR (SUNXI_UART0_BASE + 0x0) /* transmit holding register */ #define UART0_DLL (SUNXI_UART0_BASE + 0x0) /* divisor latch low register */ #define UART0_DLH (SUNXI_UART0_BASE + 0x4) /* divisor latch high register */ #define UART0_IER (SUNXI_UART0_BASE + 0x4) /* interrupt enable reigster */ #define UART0_IIR (SUNXI_UART0_BASE + 0x8) /* interrupt identity register */ #define UART0_FCR (SUNXI_UART0_BASE + 0x8) /* fifo control register */ #define UART0_LCR (SUNXI_UART0_BASE + 0xc) /* line control register */ #define UART0_LSR (SUNXI_UART0_BASE + 0x14) /* line status register */ #define BAUD_115200 (0xD) /* 24 * 1000 * 1000 / 16 / 115200 = 13 */ #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); 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; /* 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; } int main(void) { soc_detection_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_r40()) uart0_puts("Allwinner R40!\n"); else if (soc_is_v3s()) uart0_puts("Allwinner V3s!\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; }