Add Blinky sample
Signed-off-by: Alastair D'Silva <alastair@d-silva.org>pull/116/head
Alastair D'Silva
5 years ago
parent
5a1e065056
commit
716ff6d8c4
@ -0,0 +1,28 @@
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ARCH = $(shell uname -m)
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ifneq ("$(ARCH)", "ppc64")
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ifneq ("$(ARCH)", "ppc64le")
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CROSS_COMPILE ?= powerpc64le-linux-
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endif
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endif
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CC = $(CROSS_COMPILE)gcc
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LD = $(CROSS_COMPILE)ld
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OBJCOPY = $(CROSS_COMPILE)objcopy
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CFLAGS = -Os -g -Wall -std=c99 -msoft-float -mno-string -mno-multiple -mno-vsx -mno-altivec -mlittle-endian -fno-stack-protector -mstrict-align -ffreestanding -fdata-sections -ffunction-sections
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ASFLAGS = $(CFLAGS)
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LDFLAGS = -T powerpc.lds
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all: blinky.hex
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blinky.elf: blinky.o head.o
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$(LD) $(LDFLAGS) -o blinky.elf blinky.o head.o
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blinky.bin: blinky.elf
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$(OBJCOPY) -O binary blinky.elf blinky.bin
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blinky.hex: blinky.bin
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./bin2hex.py blinky.bin > blinky.hex
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clean:
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@rm -f *.o blinky.elf blinky.bin blinky.hex
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@ -0,0 +1,17 @@
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#!/usr/bin/python3
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import sys
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import subprocess
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import struct
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with open(sys.argv[1], "rb") as f:
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while True:
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word = f.read(8)
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if len(word) == 8:
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print("%016x" % struct.unpack('Q', word));
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elif len(word) == 4:
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print("00000000%08x" % struct.unpack('I', word));
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elif len(word) == 0:
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exit(0);
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else:
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raise Exception("Bad length")
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@ -0,0 +1,93 @@
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#include <stdint.h>
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#include <stdbool.h>
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#define GPIO0_BASE 0xc1000000ull
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#define GPIO_PORT_INCREMENT 0x100
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#define GPIO_IN 0x08
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#define GPIO_OUT 0x10
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#define GPIO_SET 0x18
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#define GPIO_CLEAR 0x20
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#define GPIO_TYPE_0 0x28
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#define GPIO_TYPE_1 0x30
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#define GPIO_TYPE_2 0x38
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#define GPIO_TYPE_3 0x40
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enum gpio_type {
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GPIO_TYPE_INPUT = 0x00,
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GPIO_TYPE_INT_LEVEL_LOW = 0x02,
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GPIO_TYPE_INT_LEVEL_HIGH = 0x03,
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GPIO_TYPE_INT_EDGE_FALL = 0x04,
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GPIO_TYPE_INT_EDGE_RISE = 0x05,
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GPIO_TYPE_OUTPUT = 0x07,
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};
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/**
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* Set the type of GPIO
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* @param port the GPIO port
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* @param pin the pin within the port
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* @param type the type
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*/
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static void gpio_set_type(uint8_t port, uint8_t pin, enum gpio_type type)
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{
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uint64_t val;
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uint64_t addr = GPIO0_BASE + port * GPIO_PORT_INCREMENT;
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/* Advance to the type register for the pin, pin is left as the pin
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* pin offset within the register
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*/
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if (pin < 16) {
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addr += GPIO_TYPE_0;
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} else if (pin < 32) {
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addr += GPIO_TYPE_1;
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pin -= 16;
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} else if (pin < 48) {
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addr += GPIO_TYPE_2;
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pin -= 32;
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} else {
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addr += GPIO_TYPE_3;
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pin -= 48;
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}
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val = *(volatile uint64_t *)addr; // Fetch the current set of types
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val &= ~(0x7 << (pin * 4)); // Mask out the old value
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val |= type << (pin * 4); // add in the new type
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*(volatile uint64_t *)addr = val; // write it back
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}
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/**
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* Toggle a GPIO
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* @param port the GPIO port
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* @param pin the pin within the port
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* @param val the value to output
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*/
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static void gpio_toggle(uint8_t port, uint8_t pin)
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{
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/* Writing to GPIO_IN toggles the pin. This allows us to save a
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* read/modify/write operation to output GPIO.
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*/
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uint64_t addr = GPIO0_BASE + port * GPIO_PORT_INCREMENT + GPIO_IN;
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*(volatile uint64_t *)addr = 1ul << pin;
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}
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/**
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* Burn some CPU cycles
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*/
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static void busyloop(void)
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{
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// volatile to force a memory access on each iteration
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uint64_t volatile count = 50000000;
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while (count--) {}
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}
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int main(void)
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{
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gpio_set_type(0, 0, GPIO_TYPE_OUTPUT);
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while (1) {
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gpio_toggle(0, 0);
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busyloop();
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}
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}
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@ -0,0 +1,95 @@
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/* Copyright 2013-2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define STACK_TOP 0x3000
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#define FIXUP_ENDIAN \
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tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \
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b 191f; /* Skip trampoline if endian is good */ \
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.long 0xa600607d; /* mfmsr r11 */ \
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.long 0x01006b69; /* xori r11,r11,1 */ \
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.long 0x05009f42; /* bcl 20,31,$+4 */ \
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.long 0xa602487d; /* mflr r10 */ \
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.long 0x14004a39; /* addi r10,r10,20 */ \
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.long 0xa64b5a7d; /* mthsrr0 r10 */ \
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.long 0xa64b7b7d; /* mthsrr1 r11 */ \
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.long 0x2402004c; /* hrfid */ \
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191:
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/* Load an immediate 64-bit value into a register */
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#define LOAD_IMM64(r, e) \
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lis r,(e)@highest; \
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ori r,r,(e)@higher; \
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rldicr r,r, 32, 31; \
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oris r,r, (e)@h; \
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ori r,r, (e)@l;
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.section ".head","ax"
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. = 0
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.global _start
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_start:
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FIXUP_ENDIAN
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b boot_entry
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.global boot_entry
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boot_entry:
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/* setup stack */
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LOAD_IMM64(%r1, STACK_TOP - 0x100)
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LOAD_IMM64(%r12, main)
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mtctr %r12,
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bctrl
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b .
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#define EXCEPTION(nr) \
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.= nr ;\
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b .
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/* More exception stubs */
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EXCEPTION(0x300)
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EXCEPTION(0x380)
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EXCEPTION(0x400)
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EXCEPTION(0x480)
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EXCEPTION(0x500)
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EXCEPTION(0x600)
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EXCEPTION(0x700)
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EXCEPTION(0x800)
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EXCEPTION(0x900)
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EXCEPTION(0x980)
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EXCEPTION(0xa00)
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EXCEPTION(0xb00)
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EXCEPTION(0xc00)
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EXCEPTION(0xd00)
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EXCEPTION(0xe00)
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EXCEPTION(0xe20)
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EXCEPTION(0xe40)
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EXCEPTION(0xe60)
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EXCEPTION(0xe80)
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EXCEPTION(0xf00)
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EXCEPTION(0xf20)
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EXCEPTION(0xf40)
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EXCEPTION(0xf60)
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EXCEPTION(0xf80)
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#if 0
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EXCEPTION(0x1000)
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EXCEPTION(0x1100)
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EXCEPTION(0x1200)
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EXCEPTION(0x1300)
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EXCEPTION(0x1400)
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EXCEPTION(0x1500)
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EXCEPTION(0x1600)
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#endif
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@ -0,0 +1,13 @@
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SECTIONS
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{
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_start = .;
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. = 0;
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.head : {
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KEEP(*(.head))
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}
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. = 0x1000;
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.text : { *(.text) }
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. = 0x2000;
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.data : { *(.data) }
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.bss : { *(.bss) }
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}
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