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test_mmio.c
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test_mmio.c
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/*
* c-periphery
* https://github.com/vsergeev/c-periphery
* License: MIT
*/
#include "test.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include "../src/mmio.h"
#define PAGE_SIZE 4096
#define CONTROL_MODULE_BASE 0x44e10000
#define USB_VID_PID_OFFSET 0x7f4
#define USB_VID_PID 0x04516141
#define RTCSS_BASE 0x44e3e000
#define RTC_SCRATCH2_REG_OFFSET 0x68
void test_arguments(void) {
ptest();
/* Check offset out of bounds in test_open_config_close() */
}
void test_open_config_close(void) {
mmio_t *mmio;
uintptr_t address;
uint32_t value32;
ptest();
/* Allocate MMIO */
mmio = mmio_new();
passert(mmio != NULL);
/* Open aligned base */
passert(mmio_open(mmio, CONTROL_MODULE_BASE, PAGE_SIZE) == 0);
passert(mmio_base(mmio) == CONTROL_MODULE_BASE);
passert(mmio_size(mmio) == PAGE_SIZE);
passert(mmio_ptr(mmio) != NULL);
struct mmio_handle {
uintptr_t base, aligned_base;
size_t size, aligned_size;
void *ptr;
struct {
int c_errno;
char errmsg[96];
} error;
};
/* Check alignment math */
passert(((struct mmio_handle *)mmio)->base == CONTROL_MODULE_BASE);
passert(((struct mmio_handle *)mmio)->size == PAGE_SIZE);
passert(((struct mmio_handle *)mmio)->aligned_base == CONTROL_MODULE_BASE);
passert(((struct mmio_handle *)mmio)->aligned_size == PAGE_SIZE);
passert(mmio_ptr(mmio) == ((struct mmio_handle *)mmio)->ptr);
passert(mmio_read32(mmio, PAGE_SIZE-3, &value32) == MMIO_ERROR_ARG);
passert(mmio_read32(mmio, PAGE_SIZE-2, &value32) == MMIO_ERROR_ARG);
passert(mmio_read32(mmio, PAGE_SIZE-1, &value32) == MMIO_ERROR_ARG);
passert(mmio_read32(mmio, PAGE_SIZE, &value32) == MMIO_ERROR_ARG);
passert(mmio_close(mmio) == 0);
/* Open unaligned base */
address = CONTROL_MODULE_BASE + 123;
passert(mmio_open(mmio, address, PAGE_SIZE) == 0);
passert(mmio_base(mmio) == address);
passert(mmio_size(mmio) == PAGE_SIZE);
passert(mmio_ptr(mmio) != NULL);
/* Check alignment math */
passert(((struct mmio_handle *)mmio)->base == address);
passert(((struct mmio_handle *)mmio)->size == PAGE_SIZE);
passert(((struct mmio_handle *)mmio)->aligned_base == (address - (address % sysconf(_SC_PAGESIZE))));
passert(((struct mmio_handle *)mmio)->aligned_size == (PAGE_SIZE + (address % sysconf(_SC_PAGESIZE))));
passert((size_t)((uint8_t *)mmio_ptr(mmio) - (uint8_t *)((struct mmio_handle *)mmio)->ptr) ==
(size_t)(((struct mmio_handle *)mmio)->base - ((struct mmio_handle *)mmio)->aligned_base));
passert(mmio_read32(mmio, PAGE_SIZE-3, &value32) == MMIO_ERROR_ARG);
passert(mmio_read32(mmio, PAGE_SIZE-2, &value32) == MMIO_ERROR_ARG);
passert(mmio_read32(mmio, PAGE_SIZE-1, &value32) == MMIO_ERROR_ARG);
passert(mmio_read32(mmio, PAGE_SIZE, &value32) == MMIO_ERROR_ARG);
passert(mmio_close(mmio) == 0);
/* Free MMIO */
mmio_free(mmio);
}
void test_loopback(void) {
mmio_t *mmio;
uint32_t value32;
uint8_t data[4];
uint8_t vector[] = { 0xaa, 0xbb, 0xcc, 0xdd };
ptest();
/* Allocate MMIO */
mmio = mmio_new();
passert(mmio != NULL);
/* Read USB VID/PID */
passert(mmio_open(mmio, CONTROL_MODULE_BASE, PAGE_SIZE) == 0);
passert(mmio_read32(mmio, USB_VID_PID_OFFSET, &value32) == 0);
passert(value32 == USB_VID_PID);
passert(mmio_close(mmio) == 0);
/* Read USB VID/PID via byte read */
passert(mmio_open(mmio, CONTROL_MODULE_BASE, PAGE_SIZE) == 0);
passert(mmio_read(mmio, USB_VID_PID_OFFSET, data, 4) == 0);
passert(data[0] == (USB_VID_PID & 0xff));
passert(data[1] == ((USB_VID_PID >> 8) & 0xff));
passert(data[2] == ((USB_VID_PID >> 16) & 0xff));
passert(data[3] == ((USB_VID_PID >> 24) & 0xff));
passert(mmio_close(mmio) == 0);
/* Write/Read RTC Scratch2 Register */
passert(mmio_open(mmio, RTCSS_BASE, PAGE_SIZE) == 0);
passert(mmio_write32(mmio, RTC_SCRATCH2_REG_OFFSET, 0xdeadbeef) == 0);
passert(mmio_read32(mmio, RTC_SCRATCH2_REG_OFFSET, &value32) == 0);
passert(value32 == 0xdeadbeef);
passert(mmio_close(mmio) == 0);
/* Write/Read RTC Scratch2 Register via byte write */
passert(mmio_open(mmio, RTCSS_BASE, PAGE_SIZE) == 0);
passert(mmio_write(mmio, RTC_SCRATCH2_REG_OFFSET, vector, 4) == 0);
passert(mmio_read32(mmio, RTC_SCRATCH2_REG_OFFSET, &value32) == 0);
passert(value32 == 0xddccbbaa);
passert(mmio_read(mmio, RTC_SCRATCH2_REG_OFFSET, data, 4) == 0);
passert(memcmp(data, vector, 4) == 0);
passert(mmio_close(mmio) == 0);
/* Free MMIO */
mmio_free(mmio);
}
struct rtc_ss {
volatile uint32_t seconds; /* 0x00 */
volatile uint32_t minutes; /* 0x04 */
volatile uint32_t hours; /* 0x08 */
volatile uint32_t days; /* 0x0C */
volatile uint32_t months; /* 0x10 */
volatile uint32_t years; /* 0x14 */
volatile uint32_t weeks; /* 0x18 */
volatile uint32_t reserved1; /* 0x1C */
volatile uint32_t alarm_seconds; /* 0x20 */
volatile uint32_t alarm_minutes; /* 0x24 */
volatile uint32_t alarm_hours; /* 0x28 */
volatile uint32_t alarm_days; /* 0x2C */
volatile uint32_t alarm_months; /* 0x30 */
volatile uint32_t alarm_years; /* 0x34 */
volatile uint32_t reserved2; /* 0x38 */
volatile uint32_t reserved3; /* 0x3C */
volatile uint32_t rtc_ctrl; /* 0x40 */
volatile uint32_t rtc_status; /* 0x44 */
volatile uint32_t rtc_interrupts;/* 0x48 */
};
#define BCD_HI(x) (((x) >> 4) & 0xf)
#define BCD_LO(x) ((x) & 0xf)
#define BCD2DEC(x) (10*BCD_HI(x) + BCD_LO(x))
void test_interactive(void) {
mmio_t *mmio;
uint32_t rtc_start, rtc_stop;
time_t start, stop;
struct rtc_ss *rtc;
ptest();
/* Allocate MMIO */
mmio = mmio_new();
passert(mmio != NULL);
passert(mmio_open(mmio, RTCSS_BASE, PAGE_SIZE) == 0);
rtc = (struct rtc_ss *)mmio_ptr(mmio);
printf("Waiting for seconds ones digit to reset to 0...\n");
start = time(NULL);
/* Wait until seconds low go to 0, so we don't have to deal with overflows
* in comparing times */
while (BCD_LO(rtc->seconds) != 0) {
usleep(500000);
passert((time(NULL) - start) < 12);
}
start = time(NULL);
rtc_start = rtc->seconds;
printf("Date: %04d-%02d-%02d\n", 2000 + BCD2DEC(rtc->years), BCD2DEC(rtc->months), BCD2DEC(rtc->days));
printf("Time: %02d:%02d:%02d %s\n", BCD2DEC(rtc->hours & 0x7f), BCD2DEC(rtc->minutes), BCD2DEC(rtc->seconds), (rtc->hours & 0x80) ? "PM" : "AM");
sleep(3);
printf("Date: %02d-%02d-%02d\n", 2000 + BCD2DEC(rtc->years), BCD2DEC(rtc->months), BCD2DEC(rtc->days));
printf("Time: %02d:%02d:%02d %s\n", BCD2DEC(rtc->hours & 0x7f), BCD2DEC(rtc->minutes), BCD2DEC(rtc->seconds), (rtc->hours & 0x80) ? "PM" : "AM");
rtc_stop = rtc->seconds;
stop = time(NULL);
/* Check that time has passed */
passert((stop - start) > 2);
passert((rtc_stop - rtc_start) > 2);
passert(mmio_close(mmio) == 0);
/* Free MMIO */
mmio_free(mmio);
}
int main(void) {
printf("WARNING: This test suite assumes a BeagleBone Black (AM335x) host!\n");
printf("Other systems may experience unintended and dire consequences!\n");
printf("Press enter to continue!\n");
getc(stdin);
test_arguments();
printf(" " STR_OK " Arguments test passed.\n\n");
test_open_config_close();
printf(" " STR_OK " Open/close test passed.\n\n");
test_loopback();
printf(" " STR_OK " Loopback test passed.\n\n");
test_interactive();
printf(" " STR_OK " Interactive test passed.\n\n");
printf("All tests passed!\n");
return 0;
}