diff options
Diffstat (limited to 'board/gateworks/gw_ventana/gsc.c')
| -rw-r--r-- | board/gateworks/gw_ventana/gsc.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/board/gateworks/gw_ventana/gsc.c b/board/gateworks/gw_ventana/gsc.c new file mode 100644 index 0000000..37966ab --- /dev/null +++ b/board/gateworks/gw_ventana/gsc.c @@ -0,0 +1,129 @@ +/* + * Copyright (C) 2013 Gateworks Corporation + * + * Author: Tim Harvey <tharvey@gateworks.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <asm/errno.h> +#include <common.h> +#include <i2c.h> +#include <linux/ctype.h> + +#include "gsc.h" + +#define MINMAX(n, percent) ((n)*(100-percent)/100), ((n)*(100+percent)/100) + +/* + * The Gateworks System Controller will fail to ACK a master transaction if + * it is busy, which can occur during its 1HZ timer tick while reading ADC's. + * When this does occur, it will never be busy long enough to fail more than + * 2 back-to-back transfers. Thus we wrap i2c_read and i2c_write with + * 3 retries. + */ +int gsc_i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) +{ + int retry = 3; + int n = 0; + int ret; + + while (n++ < retry) { + ret = i2c_read(chip, addr, alen, buf, len); + if (!ret) + break; + debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr, + n, ret); + if (ret != -ENODEV) + break; + mdelay(10); + } + return ret; +} + +int gsc_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) +{ + int retry = 3; + int n = 0; + int ret; + + while (n++ < retry) { + ret = i2c_write(chip, addr, alen, buf, len); + if (!ret) + break; + debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr, + n, ret); + if (ret != -ENODEV) + break; + mdelay(10); + } + mdelay(1); + return ret; +} + +#ifdef CONFIG_CMD_GSC +static void read_hwmon(const char *name, uint reg, uint size, uint low, + uint high) +{ + unsigned char buf[3]; + uint ui; + + printf("%-8s:", name); + memset(buf, 0, sizeof(buf)); + if (gsc_i2c_read(GSC_HWMON_ADDR, reg, 1, buf, size)) { + puts("fRD\n"); + } else { + ui = buf[0] | (buf[1]<<8) | (buf[2]<<16); + if (ui == 0xffffff) + printf("invalid"); + else if (ui < low) + printf("%d Failed - Low", ui); + else if (ui > high) + printf("%d Failed - High", ui); + else + printf("%d", ui); + } + puts("\n"); +} + +int do_gsc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + const char *model = getenv("model"); + + i2c_set_bus_num(0); + read_hwmon("Temp", GSC_HWMON_TEMP, 2, 0, 9000); + read_hwmon("VIN", GSC_HWMON_VIN, 3, 8000, 60000); + read_hwmon("VBATT", GSC_HWMON_VBATT, 3, 1800, 3500); + read_hwmon("VDD_3P3", GSC_HWMON_VDD_3P3, 3, MINMAX(3300, 10)); + read_hwmon("VDD_HIGH", GSC_HWMON_VDD_HIGH, 3, MINMAX(3000, 10)); + read_hwmon("VDD_DDR", GSC_HWMON_VDD_DDR, 3, MINMAX(1500, 10)); + read_hwmon("VDD_5P0", GSC_HWMON_VDD_5P0, 3, MINMAX(5000, 10)); + read_hwmon("VDD_2P5", GSC_HWMON_VDD_2P5, 3, MINMAX(2500, 10)); + read_hwmon("VDD_1P8", GSC_HWMON_VDD_1P8, 3, MINMAX(1800, 10)); + + switch (model[3]) { + case '1': /* GW51xx */ + read_hwmon("VDD_CORE", GSC_HWMON_VDD_CORE, 3, MINMAX(1175, 10)); + read_hwmon("VDD_SOC", GSC_HWMON_VDD_SOC, 3, MINMAX(1175, 10)); + break; + case '2': /* GW52xx */ + case '3': /* GW53xx */ + read_hwmon("VDD_CORE", GSC_HWMON_VDD_CORE, 3, MINMAX(1175, 10)); + read_hwmon("VDD_SOC", GSC_HWMON_VDD_SOC, 3, MINMAX(1175, 10)); + read_hwmon("VDD_1P0", GSC_HWMON_VDD_1P0, 3, MINMAX(1000, 10)); + break; + case '4': /* GW54xx */ + read_hwmon("VDD_CORE", GSC_HWMON_VDD_CORE, 3, MINMAX(1375, 10)); + read_hwmon("VDD_SOC", GSC_HWMON_VDD_SOC, 3, MINMAX(1375, 10)); + read_hwmon("VDD_1P0", GSC_HWMON_VDD_1P0, 3, MINMAX(1000, 10)); + break; + } + return 0; +} + +U_BOOT_CMD(gsc, 1, 1, do_gsc, + "GSC test", + "" +); + +#endif /* CONFIG_CMD_GSC */ |