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picorv32/picosoc/firmware.c

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/*
* PicoSoC - A simple example SoC using PicoRV32
*
* Copyright (C) 2017 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <stdint.h>
#include <stdbool.h>
#ifdef ICEBREAKER
# define MEM_TOTAL 0x20000 /* 128 KB */
#elif HX8KDEMO
# define MEM_TOTAL 0x200 /* 2 KB */
#else
# error "Set -DICEBREAKER or -DHX8KDEMO when compiling firmware.c"
#endif
// a pointer to this is a null pointer, but the compiler does not
// know that because "sram" is a linker symbol from sections.lds.
extern uint32_t sram;
#define reg_spictrl (*(volatile uint32_t*)0x02000000)
#define reg_uart_clkdiv (*(volatile uint32_t*)0x02000004)
#define reg_uart_data (*(volatile uint32_t*)0x02000008)
#define reg_leds (*(volatile uint32_t*)0x03000000)
// --------------------------------------------------------
extern uint32_t flashio_worker_begin;
extern uint32_t flashio_worker_end;
void flashio(uint8_t *data, int len, uint8_t wrencmd)
{
uint32_t func[&flashio_worker_end - &flashio_worker_begin];
uint32_t *src_ptr = &flashio_worker_begin;
uint32_t *dst_ptr = func;
while (src_ptr != &flashio_worker_end)
*(dst_ptr++) = *(src_ptr++);
((void(*)(uint8_t*, uint32_t, uint32_t))func)(data, len, wrencmd);
}
#ifdef HX8KDEMO
void set_flash_qspi_flag()
{
uint8_t buffer[8];
uint32_t addr_cr1v = 0x800002;
// Read Any Register (RDAR 65h)
buffer[0] = 0x65;
buffer[1] = addr_cr1v >> 16;
buffer[2] = addr_cr1v >> 8;
buffer[3] = addr_cr1v;
buffer[4] = 0; // dummy
buffer[5] = 0; // rdata
flashio(buffer, 6, 0);
uint8_t cr1v = buffer[5];
// Write Enable (WREN 06h) + Write Any Register (WRAR 71h)
buffer[0] = 0x71;
buffer[1] = addr_cr1v >> 16;
buffer[2] = addr_cr1v >> 8;
buffer[3] = addr_cr1v;
buffer[4] = cr1v | 2; // Enable QSPI
flashio(buffer, 5, 0x06);
}
void set_flash_latency(uint8_t value)
{
reg_spictrl = (reg_spictrl & ~0x007f0000) | ((value & 15) << 16);
uint32_t addr = 0x800004;
uint8_t buffer_wr[5] = {0x71, addr >> 16, addr >> 8, addr, 0x70 | value};
flashio(buffer_wr, 5, 0x06);
}
void set_flash_mode_spi()
{
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00000000;
}
void set_flash_mode_dual()
{
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00400000;
}
void set_flash_mode_quad()
{
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00200000;
}
void set_flash_mode_qddr()
{
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00600000;
}
#endif
#ifdef ICEBREAKER
void set_flash_qspi_flag()
{
uint8_t buffer[8];
// Read Configuration Registers (RDCR1 35h)
buffer[0] = 0x35;
buffer[1] = 0x00; // rdata
flashio(buffer, 2, 0);
uint8_t sr2 = buffer[1];
// Write Enable Volatile (50h) + Write Status Register 2 (31h)
buffer[0] = 0x31;
buffer[1] = sr2 | 2; // Enable QSPI
flashio(buffer, 2, 0x50);
}
void set_flash_mode_spi()
{
reg_spictrl = (reg_spictrl & ~0x007f0000) | 0x00000000;
}
void set_flash_mode_dual()
{
reg_spictrl = (reg_spictrl & ~0x007f0000) | 0x00400000;
}
void set_flash_mode_quad()
{
reg_spictrl = (reg_spictrl & ~0x007f0000) | 0x00240000;
}
void set_flash_mode_qddr()
{
reg_spictrl = (reg_spictrl & ~0x007f0000) | 0x00670000;
}
void enable_flash_crm()
{
reg_spictrl |= 0x00100000;
}
#endif
// --------------------------------------------------------
void putchar(char c)
{
if (c == '\n')
putchar('\r');
reg_uart_data = c;
}
void print(const char *p)
{
while (*p)
putchar(*(p++));
}
void print_hex(uint32_t v, int digits)
{
for (int i = 7; i >= 0; i--) {
char c = "0123456789abcdef"[(v >> (4*i)) & 15];
if (c == '0' && i >= digits) continue;
putchar(c);
digits = i;
}
}
void print_dec(uint32_t v)
{
if (v >= 1000) {
print(">=1000");
return;
}
if (v >= 900) { putchar('9'); v -= 900; }
else if (v >= 800) { putchar('8'); v -= 800; }
else if (v >= 700) { putchar('7'); v -= 700; }
else if (v >= 600) { putchar('6'); v -= 600; }
else if (v >= 500) { putchar('5'); v -= 500; }
else if (v >= 400) { putchar('4'); v -= 400; }
else if (v >= 300) { putchar('3'); v -= 300; }
else if (v >= 200) { putchar('2'); v -= 200; }
else if (v >= 100) { putchar('1'); v -= 100; }
if (v >= 90) { putchar('9'); v -= 90; }
else if (v >= 80) { putchar('8'); v -= 80; }
else if (v >= 70) { putchar('7'); v -= 70; }
else if (v >= 60) { putchar('6'); v -= 60; }
else if (v >= 50) { putchar('5'); v -= 50; }
else if (v >= 40) { putchar('4'); v -= 40; }
else if (v >= 30) { putchar('3'); v -= 30; }
else if (v >= 20) { putchar('2'); v -= 20; }
else if (v >= 10) { putchar('1'); v -= 10; }
if (v >= 9) { putchar('9'); v -= 9; }
else if (v >= 8) { putchar('8'); v -= 8; }
else if (v >= 7) { putchar('7'); v -= 7; }
else if (v >= 6) { putchar('6'); v -= 6; }
else if (v >= 5) { putchar('5'); v -= 5; }
else if (v >= 4) { putchar('4'); v -= 4; }
else if (v >= 3) { putchar('3'); v -= 3; }
else if (v >= 2) { putchar('2'); v -= 2; }
else if (v >= 1) { putchar('1'); v -= 1; }
else putchar('0');
}
char getchar_prompt(char *prompt)
{
int32_t c = -1;
uint32_t cycles_begin, cycles_now, cycles;
__asm__ volatile ("rdcycle %0" : "=r"(cycles_begin));
reg_leds = ~0;
if (prompt)
print(prompt);
while (c == -1) {
__asm__ volatile ("rdcycle %0" : "=r"(cycles_now));
cycles = cycles_now - cycles_begin;
if (cycles > 12000000) {
if (prompt)
print(prompt);
cycles_begin = cycles_now;
reg_leds = ~reg_leds;
}
c = reg_uart_data;
}
reg_leds = 0;
return c;
}
char getchar()
{
return getchar_prompt(0);
}
void cmd_print_spi_state()
{
print("SPI State:\n");
print(" LATENCY ");
print_dec((reg_spictrl >> 16) & 15);
print("\n");
print(" DDR ");
if ((reg_spictrl & (1 << 22)) != 0)
print("ON\n");
else
print("OFF\n");
print(" QSPI ");
if ((reg_spictrl & (1 << 21)) != 0)
print("ON\n");
else
print("OFF\n");
print(" CRM ");
if ((reg_spictrl & (1 << 20)) != 0)
print("ON\n");
else
print("OFF\n");
}
uint32_t xorshift32(uint32_t *state)
{
/* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */
uint32_t x = *state;
x ^= x << 13;
x ^= x >> 17;
x ^= x << 5;
*state = x;
return x;
}
void cmd_memtest()
{
int cyc_count = 5;
int stride = 256;
uint32_t state;
volatile uint32_t *base_word = (uint32_t *) 0;
volatile uint8_t *base_byte = (uint8_t *) 0;
print("Running memtest ");
// Walk in stride increments, word access
for (int i = 1; i <= cyc_count; i++) {
state = i;
for (int word = 0; word < MEM_TOTAL / sizeof(int); word += stride) {
*(base_word + word) = xorshift32(&state);
}
state = i;
for (int word = 0; word < MEM_TOTAL / sizeof(int); word += stride) {
if (*(base_word + word) != xorshift32(&state)) {
print(" ***FAILED WORD*** at ");
print_hex(4*word, 4);
print("\n");
return;
}
}
print(".");
}
// Byte access
for (int byte = 0; byte < 128; byte++) {
*(base_byte + byte) = (uint8_t) byte;
}
for (int byte = 0; byte < 128; byte++) {
if (*(base_byte + byte) != (uint8_t) byte) {
print(" ***FAILED BYTE*** at ");
print_hex(byte, 4);
print("\n");
return;
}
}
print(" passed\n");
}
// --------------------------------------------------------
void cmd_read_flash_id()
{
uint8_t buffer[17] = { 0x9F, /* zeros */ };
flashio(buffer, 17, 0);
for (int i = 1; i <= 16; i++) {
putchar(' ');
print_hex(buffer[i], 2);
}
putchar('\n');
}
// --------------------------------------------------------
#ifdef HX8KDEMO
uint8_t cmd_read_flash_regs_print(uint32_t addr, const char *name)
{
set_flash_latency(8);
uint8_t buffer[6] = {0x65, addr >> 16, addr >> 8, addr, 0, 0};
flashio(buffer, 6, 0);
print("0x");
print_hex(addr, 6);
print(" ");
print(name);
print(" 0x");
print_hex(buffer[5], 2);
print("\n");
return buffer[5];
}
void cmd_read_flash_regs()
{
print("\n");
uint8_t sr1v = cmd_read_flash_regs_print(0x800000, "SR1V");
uint8_t sr2v = cmd_read_flash_regs_print(0x800001, "SR2V");
uint8_t cr1v = cmd_read_flash_regs_print(0x800002, "CR1V");
uint8_t cr2v = cmd_read_flash_regs_print(0x800003, "CR2V");
uint8_t cr3v = cmd_read_flash_regs_print(0x800004, "CR3V");
uint8_t vdlp = cmd_read_flash_regs_print(0x800005, "VDLP");
}
#endif
#ifdef ICEBREAKER
uint8_t cmd_read_flash_reg(uint8_t cmd)
{
uint8_t buffer[2] = {cmd, 0};
flashio(buffer, 2, 0);
return buffer[1];
}
void print_reg_bit(int val, const char *name)
{
for (int i = 0; i < 12; i++) {
if (*name == 0)
putchar(' ');
else
putchar(*(name++));
}
putchar(val ? '1' : '0');
putchar('\n');
}
void cmd_read_flash_regs()
{
putchar('\n');
uint8_t sr1 = cmd_read_flash_reg(0x05);
uint8_t sr2 = cmd_read_flash_reg(0x35);
uint8_t sr3 = cmd_read_flash_reg(0x15);
print_reg_bit(sr1 & 0x01, "S0 (BUSY)");
print_reg_bit(sr1 & 0x02, "S1 (WEL)");
print_reg_bit(sr1 & 0x04, "S2 (BP0)");
print_reg_bit(sr1 & 0x08, "S3 (BP1)");
print_reg_bit(sr1 & 0x10, "S4 (BP2)");
print_reg_bit(sr1 & 0x20, "S5 (TB)");
print_reg_bit(sr1 & 0x40, "S6 (SEC)");
print_reg_bit(sr1 & 0x80, "S7 (SRP)");
putchar('\n');
print_reg_bit(sr2 & 0x01, "S8 (SRL)");
print_reg_bit(sr2 & 0x02, "S9 (QE)");
print_reg_bit(sr2 & 0x04, "S10 ----");
print_reg_bit(sr2 & 0x08, "S11 (LB1)");
print_reg_bit(sr2 & 0x10, "S12 (LB2)");
print_reg_bit(sr2 & 0x20, "S13 (LB3)");
print_reg_bit(sr2 & 0x40, "S14 (CMP)");
print_reg_bit(sr2 & 0x80, "S15 (SUS)");
putchar('\n');
print_reg_bit(sr3 & 0x01, "S16 ----");
print_reg_bit(sr3 & 0x02, "S17 ----");
print_reg_bit(sr3 & 0x04, "S18 (WPS)");
print_reg_bit(sr3 & 0x08, "S19 ----");
print_reg_bit(sr3 & 0x10, "S20 ----");
print_reg_bit(sr3 & 0x20, "S21 (DRV0)");
print_reg_bit(sr3 & 0x40, "S22 (DRV1)");
print_reg_bit(sr3 & 0x80, "S23 (HOLD)");
putchar('\n');
}
#endif
// --------------------------------------------------------
uint32_t cmd_benchmark(bool verbose, uint32_t *instns_p)
{
uint8_t data[256];
uint32_t *words = (void*)data;
uint32_t x32 = 314159265;
uint32_t cycles_begin, cycles_end;
uint32_t instns_begin, instns_end;
__asm__ volatile ("rdcycle %0" : "=r"(cycles_begin));
__asm__ volatile ("rdinstret %0" : "=r"(instns_begin));
for (int i = 0; i < 20; i++)
{
for (int k = 0; k < 256; k++)
{
x32 ^= x32 << 13;
x32 ^= x32 >> 17;
x32 ^= x32 << 5;
data[k] = x32;
}
for (int k = 0, p = 0; k < 256; k++)
{
if (data[k])
data[p++] = k;
}
for (int k = 0, p = 0; k < 64; k++)
{
x32 = x32 ^ words[k];
}
}
__asm__ volatile ("rdcycle %0" : "=r"(cycles_end));
__asm__ volatile ("rdinstret %0" : "=r"(instns_end));
if (verbose)
{
print("Cycles: 0x");
print_hex(cycles_end - cycles_begin, 8);
putchar('\n');
print("Instns: 0x");
print_hex(instns_end - instns_begin, 8);
putchar('\n');
print("Chksum: 0x");
print_hex(x32, 8);
putchar('\n');
}
if (instns_p)
*instns_p = instns_end - instns_begin;
return cycles_end - cycles_begin;
}
// --------------------------------------------------------
#ifdef HX8KDEMO
void cmd_benchmark_all()
{
uint32_t instns = 0;
print("default ");
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00000000;
print(": ");
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
for (int i = 8; i > 0; i--)
{
print("dspi-");
print_dec(i);
print(" ");
set_flash_latency(i);
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00400000;
print(": ");
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
}
for (int i = 8; i > 0; i--)
{
print("dspi-crm-");
print_dec(i);
print(" ");
set_flash_latency(i);
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00500000;
print(": ");
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
}
for (int i = 8; i > 0; i--)
{
print("qspi-");
print_dec(i);
print(" ");
set_flash_latency(i);
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00200000;
print(": ");
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
}
for (int i = 8; i > 0; i--)
{
print("qspi-crm-");
print_dec(i);
print(" ");
set_flash_latency(i);
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00300000;
print(": ");
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
}
for (int i = 8; i > 0; i--)
{
print("qspi-ddr-");
print_dec(i);
print(" ");
set_flash_latency(i);
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00600000;
print(": ");
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
}
for (int i = 8; i > 0; i--)
{
print("qspi-ddr-crm-");
print_dec(i);
print(" ");
set_flash_latency(i);
reg_spictrl = (reg_spictrl & ~0x00700000) | 0x00700000;
print(": ");
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
}
print("instns : ");
print_hex(instns, 8);
putchar('\n');
}
#endif
#ifdef ICEBREAKER
void cmd_benchmark_all()
{
uint32_t instns = 0;
print("default ");
set_flash_mode_spi();
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
print("dual ");
set_flash_mode_dual();
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
// print("dual-crm ");
// enable_flash_crm();
// print_hex(cmd_benchmark(false, &instns), 8);
// putchar('\n');
print("quad ");
set_flash_mode_quad();
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
print("quad-crm ");
enable_flash_crm();
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
print("qddr ");
set_flash_mode_qddr();
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
print("qddr-crm ");
enable_flash_crm();
print_hex(cmd_benchmark(false, &instns), 8);
putchar('\n');
}
#endif
void cmd_echo()
{
print("Return to menu by sending '!'\n\n");
char c;
while ((c = getchar()) != '!')
putchar(c);
}
// --------------------------------------------------------
void main()
{
reg_leds = 31;
reg_uart_clkdiv = 104;
print("Booting..\n");
reg_leds = 63;
set_flash_qspi_flag();
reg_leds = 127;
while (getchar_prompt("Press ENTER to continue..\n") != '\r') { /* wait */ }
print("\n");
print(" ____ _ ____ ____\n");
print(" | _ \\(_) ___ ___/ ___| ___ / ___|\n");
print(" | |_) | |/ __/ _ \\___ \\ / _ \\| |\n");
print(" | __/| | (_| (_) |__) | (_) | |___\n");
print(" |_| |_|\\___\\___/____/ \\___/ \\____|\n");
print("\n");
print("Total memory: ");
print_dec(MEM_TOTAL / 1024);
print(" KiB\n");
print("\n");
//cmd_memtest(); // test overwrites bss and data memory
print("\n");
cmd_print_spi_state();
print("\n");
while (1)
{
print("\n");
print("Select an action:\n");
print("\n");
print(" [1] Read SPI Flash ID\n");
print(" [2] Read SPI Config Regs\n");
print(" [3] Switch to default mode\n");
print(" [4] Switch to Dual I/O mode\n");
print(" [5] Switch to Quad I/O mode\n");
print(" [6] Switch to Quad DDR mode\n");
print(" [7] Toggle continuous read mode\n");
print(" [9] Run simplistic benchmark\n");
print(" [0] Benchmark all configs\n");
print(" [M] Run Memtest\n");
print(" [S] Print SPI state\n");
print(" [e] Echo UART\n");
print("\n");
for (int rep = 10; rep > 0; rep--)
{
print("Command> ");
char cmd = getchar();
if (cmd > 32 && cmd < 127)
putchar(cmd);
print("\n");
switch (cmd)
{
case '1':
cmd_read_flash_id();
break;
case '2':
cmd_read_flash_regs();
break;
case '3':
set_flash_mode_spi();
break;
case '4':
set_flash_mode_dual();
break;
case '5':
set_flash_mode_quad();
break;
case '6':
set_flash_mode_qddr();
break;
case '7':
reg_spictrl = reg_spictrl ^ 0x00100000;
break;
case '9':
cmd_benchmark(true, 0);
break;
case '0':
cmd_benchmark_all();
break;
case 'M':
cmd_memtest();
break;
case 'S':
cmd_print_spi_state();
break;
case 'e':
cmd_echo();
break;
default:
continue;
}
break;
}
}
}
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