From 48e6d34360a0c80d29b5975fb4450ec5dedca4d6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marek=20Beh=C3=BAn?= Date: Thu, 2 May 2019 16:53:30 +0200 Subject: [PATCH] arm: mvebu: turris_omnia: refactor I2C accessing code MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Refactor code which accesses the microcontroller and EEPROM via I2C. Signed-off-by: Marek Behún Reviewed-by: Stefan Roese Signed-off-by: Stefan Roese --- board/CZ.NIC/turris_omnia/turris_omnia.c | 211 ++++++++++++----------- 1 file changed, 112 insertions(+), 99 deletions(-) diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c index 055ebad000..6b8fa53c98 100644 --- a/board/CZ.NIC/turris_omnia/turris_omnia.c +++ b/board/CZ.NIC/turris_omnia/turris_omnia.c @@ -32,18 +32,25 @@ DECLARE_GLOBAL_DATA_PTR; -#define OMNIA_I2C_EEPROM_DM_NAME "i2c@11000->i2cmux@70->i2c@0" -#define OMNIA_I2C_EEPROM 0x54 -#define OMNIA_I2C_EEPROM_CONFIG_ADDR 0x0 -#define OMNIA_I2C_EEPROM_ADDRLEN 2 +#define OMNIA_I2C_BUS_NAME "i2c@11000->i2cmux@70->i2c@0" + +#define OMNIA_I2C_MCU_CHIP_ADDR 0x2a +#define OMNIA_I2C_MCU_CHIP_LEN 1 + +#define OMNIA_I2C_EEPROM_CHIP_ADDR 0x54 +#define OMNIA_I2C_EEPROM_CHIP_LEN 2 #define OMNIA_I2C_EEPROM_MAGIC 0x0341a034 -#define OMNIA_I2C_MCU_DM_NAME "i2c@11000->i2cmux@70->i2c@0" -#define OMNIA_I2C_MCU_ADDR_STATUS 0x1 -#define OMNIA_I2C_MCU_SATA 0x20 -#define OMNIA_I2C_MCU_CARDDET 0x10 -#define OMNIA_I2C_MCU 0x2a -#define OMNIA_I2C_MCU_WDT_ADDR 0x0b +enum mcu_commands { + CMD_GET_STATUS_WORD = 0x01, + CMD_GET_RESET = 0x09, + CMD_WATCHDOG_STATE = 0x0b, +}; + +enum status_word_bits { + CARD_DET_STSBIT = 0x0010, + MSATA_IND_STSBIT = 0x0020, +}; #define OMNIA_ATSHA204_OTP_VERSION 0 #define OMNIA_ATSHA204_OTP_SERIAL 1 @@ -85,48 +92,97 @@ static struct serdes_map board_serdes_map_sata[] = { {SGMII2, SERDES_SPEED_1_25_GBPS, SERDES_DEFAULT_MODE, 0, 0} }; -static bool omnia_detect_sata(void) +static struct udevice *omnia_get_i2c_chip(const char *name, uint addr, + uint offset_len) { struct udevice *bus, *dev; - int ret, retry = 3; - u16 mode; + int ret; - puts("SERDES0 card detect: "); - - if (uclass_get_device_by_name(UCLASS_I2C, OMNIA_I2C_MCU_DM_NAME, &bus)) { - puts("Cannot find MCU bus!\n"); - return false; - } - - ret = i2c_get_chip(bus, OMNIA_I2C_MCU, 1, &dev); + ret = uclass_get_device_by_name(UCLASS_I2C, OMNIA_I2C_BUS_NAME, &bus); if (ret) { - puts("Cannot get MCU chip!\n"); + printf("Cannot get I2C bus %s: uclass_get_device_by_name failed: %i\n", + OMNIA_I2C_BUS_NAME, ret); + return NULL; + } + + ret = i2c_get_chip(bus, addr, offset_len, &dev); + if (ret) { + printf("Cannot get %s I2C chip: i2c_get_chip failed: %i\n", + name, ret); + return NULL; + } + + return dev; +} + +static int omnia_mcu_read(u8 cmd, void *buf, int len) +{ + struct udevice *chip; + + chip = omnia_get_i2c_chip("MCU", OMNIA_I2C_MCU_CHIP_ADDR, + OMNIA_I2C_MCU_CHIP_LEN); + if (!chip) + return -ENODEV; + + return dm_i2c_read(chip, cmd, buf, len); +} + +#ifndef CONFIG_SPL_BUILD +static int omnia_mcu_write(u8 cmd, const void *buf, int len) +{ + struct udevice *chip; + + chip = omnia_get_i2c_chip("MCU", OMNIA_I2C_MCU_CHIP_ADDR, + OMNIA_I2C_MCU_CHIP_LEN); + if (!chip) + return -ENODEV; + + return dm_i2c_write(chip, cmd, buf, len); +} + +static bool disable_mcu_watchdog(void) +{ + int ret; + + puts("Disabling MCU watchdog... "); + + ret = omnia_mcu_write(CMD_WATCHDOG_STATE, "\x00", 1); + if (ret) { + printf("omnia_mcu_write failed: %i\n", ret); return false; } - for (; retry > 0; --retry) { - ret = dm_i2c_read(dev, OMNIA_I2C_MCU_ADDR_STATUS, (uchar *) &mode, 2); - if (!ret) - break; - } + puts("disabled\n"); - if (!retry) { - puts("I2C read failed! Default PEX\n"); + return true; +} +#endif + +static bool omnia_detect_sata(void) +{ + int ret; + u16 stsword; + + puts("MiniPCIe/mSATA card detection... "); + + ret = omnia_mcu_read(CMD_GET_STATUS_WORD, &stsword, sizeof(stsword)); + if (ret) { + printf("omnia_mcu_read failed: %i, defaulting to MiniPCIe card\n", + ret); return false; } - if (!(mode & OMNIA_I2C_MCU_CARDDET)) { - puts("NONE\n"); + if (!(stsword & CARD_DET_STSBIT)) { + puts("none\n"); return false; } - if (mode & OMNIA_I2C_MCU_SATA) { - puts("SATA\n"); - return true; - } else { - puts("PEX\n"); - return false; - } + if (stsword & MSATA_IND_STSBIT) + puts("mSATA\n"); + else + puts("MiniPCIe\n"); + + return stsword & MSATA_IND_STSBIT ? true : false; } int hws_board_topology_load(struct serdes_map **serdes_map_array, u8 *count) @@ -151,42 +207,32 @@ struct omnia_eeprom { static bool omnia_read_eeprom(struct omnia_eeprom *oep) { - struct udevice *bus, *dev; - int ret, crc, retry = 3; + struct udevice *chip; + u32 crc; + int ret; - if (uclass_get_device_by_name(UCLASS_I2C, OMNIA_I2C_EEPROM_DM_NAME, &bus)) { - puts("Cannot find EEPROM bus\n"); + chip = omnia_get_i2c_chip("EEPROM", OMNIA_I2C_EEPROM_CHIP_ADDR, + OMNIA_I2C_EEPROM_CHIP_LEN); + + if (!chip) return false; - } - ret = i2c_get_chip(bus, OMNIA_I2C_EEPROM, OMNIA_I2C_EEPROM_ADDRLEN, &dev); + ret = dm_i2c_read(chip, 0, (void *)oep, sizeof(*oep)); if (ret) { - puts("Cannot get EEPROM chip\n"); + printf("dm_i2c_read failed: %i, cannot read EEPROM\n", ret); return false; } - for (; retry > 0; --retry) { - ret = dm_i2c_read(dev, OMNIA_I2C_EEPROM_CONFIG_ADDR, (uchar *) oep, sizeof(struct omnia_eeprom)); - if (ret) - continue; - - if (oep->magic != OMNIA_I2C_EEPROM_MAGIC) { - puts("I2C EEPROM missing magic number!\n"); - continue; - } - - crc = crc32(0, (unsigned char *) oep, - sizeof(struct omnia_eeprom) - 4); - if (crc == oep->crc) { - break; - } else { - printf("CRC of EEPROM memory config failed! " - "calc=0x%04x saved=0x%04x\n", crc, oep->crc); - } + if (oep->magic != OMNIA_I2C_EEPROM_MAGIC) { + printf("bad EEPROM magic number (%08x, should be %08x)\n", + oep->magic, OMNIA_I2C_EEPROM_MAGIC); + return false; } - if (!retry) { - puts("I2C EEPROM read failed!\n"); + crc = crc32(0, (void *)oep, sizeof(*oep) - 4); + if (crc != oep->crc) { + printf("bad EEPROM CRC (stored %08x, computed %08x)\n", + oep->crc, crc); return false; } @@ -320,46 +366,13 @@ int board_early_init_f(void) return 0; } -#ifndef CONFIG_SPL_BUILD -static bool disable_mcu_watchdog(void) -{ - struct udevice *bus, *dev; - int ret, retry = 3; - uchar buf[1] = {0x0}; - - if (uclass_get_device_by_name(UCLASS_I2C, OMNIA_I2C_MCU_DM_NAME, &bus)) { - puts("Cannot find MCU bus! Can not disable MCU WDT.\n"); - return false; - } - - ret = i2c_get_chip(bus, OMNIA_I2C_MCU, 1, &dev); - if (ret) { - puts("Cannot get MCU chip! Can not disable MCU WDT.\n"); - return false; - } - - for (; retry > 0; --retry) - if (!dm_i2c_write(dev, OMNIA_I2C_MCU_WDT_ADDR, (uchar *) buf, 1)) - break; - - if (retry <= 0) { - puts("I2C MCU watchdog failed to disable!\n"); - return false; - } - - return true; -} -#endif - int board_init(void) { /* adress of boot parameters */ gd->bd->bi_boot_params = mvebu_sdram_bar(0) + 0x100; #ifndef CONFIG_SPL_BUILD - if (disable_mcu_watchdog()) - puts("Disabled MCU startup watchdog.\n"); - + disable_mcu_watchdog(); set_regdomain(); #endif