[U-Boot] [PATCH u-boot-marvell v2 07/15] arm: mvebu: turris_omnia: refactor I2C accessing code
Marek Behún
marek.behun at nic.cz
Tue Apr 30 01:48:17 UTC 2019
Refactor code which accesses the microcontroller and EEPROM via I2C.
Signed-off-by: Marek Behún <marek.behun at nic.cz>
---
board/CZ.NIC/turris_omnia/turris_omnia.c | 205 ++++++++++++-----------
1 file changed, 109 insertions(+), 96 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 at 11000->i2cmux at 70->i2c at 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 at 11000->i2cmux at 70->i2c at 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 at 11000->i2cmux at 70->i2c at 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;
-
- puts("SERDES0 card detect: ");
+ int ret;
- if (uclass_get_device_by_name(UCLASS_I2C, OMNIA_I2C_MCU_DM_NAME, &bus)) {
- puts("Cannot find MCU bus!\n");
- return false;
+ ret = uclass_get_device_by_name(UCLASS_I2C, OMNIA_I2C_BUS_NAME, &bus);
+ if (ret) {
+ 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, OMNIA_I2C_MCU, 1, &dev);
+ ret = i2c_get_chip(bus, addr, offset_len, &dev);
if (ret) {
- puts("Cannot get MCU chip!\n");
- return false;
+ printf("Cannot get %s I2C chip: i2c_get_chip failed: %i\n",
+ name, ret);
+ return NULL;
}
- for (; retry > 0; --retry) {
- ret = dm_i2c_read(dev, OMNIA_I2C_MCU_ADDR_STATUS, (uchar *) &mode, 2);
- if (!ret)
- break;
- }
+ 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);
+}
- if (!retry) {
- puts("I2C read failed! Default PEX\n");
+#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;
}
- if (!(mode & OMNIA_I2C_MCU_CARDDET)) {
- puts("NONE\n");
+ puts("disabled\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_SATA) {
- puts("SATA\n");
- return true;
- } else {
- puts("PEX\n");
+ if (!(stsword & CARD_DET_STSBIT)) {
+ puts("none\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;
+
+ chip = omnia_get_i2c_chip("EEPROM", OMNIA_I2C_EEPROM_CHIP_ADDR,
+ OMNIA_I2C_EEPROM_CHIP_LEN);
- if (uclass_get_device_by_name(UCLASS_I2C, OMNIA_I2C_EEPROM_DM_NAME, &bus)) {
- puts("Cannot find EEPROM bus\n");
+ 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
--
2.21.0
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