board: ge: bx50v3: set eth0 MAC address

Define i2c mux configuration.  Add new vpd_reader which is used to read
vital product data.  Read VPD from EEPROM and set eth0 MAC address.

Signed-off-by: Ian Ray <ian.ray@ge.com>
Signed-off-by: Jose Alarcon <jose.alarcon@ge.com>

board/ge/bx50v3/Makefile

@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y  := bx50v3.o
+obj-y  := bx50v3.o vpd_reader.o

board/ge/bx50v3/bx50v3.c

@@ -26,8 +26,19 @@
 #include <asm/arch/sys_proto.h>
 #include <i2c.h>
 #include <pwm.h>
+#include <stdlib.h>
+#include "vpd_reader.h"
 DECLARE_GLOBAL_DATA_PTR;
 
+#ifndef CONFIG_SYS_I2C_EEPROM_ADDR
+# define CONFIG_SYS_I2C_EEPROM_ADDR     0x50
+# define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 1
+#endif
+
+#ifndef CONFIG_SYS_I2C_EEPROM_BUS
+#define CONFIG_SYS_I2C_EEPROM_BUS       2
+#endif
+
 #define NC_PAD_CTRL (PAD_CTL_PUS_100K_UP |	\
 	PAD_CTL_SPEED_MED | PAD_CTL_DSE_40ohm |	\
 	PAD_CTL_HYS)
@@ -528,6 +539,102 @@ int overwrite_console(void)
 	return 1;
 }
 
+#define VPD_TYPE_INVALID 0x00
+#define VPD_BLOCK_NETWORK 0x20
+#define VPD_BLOCK_HWID 0x44
+#define VPD_PRODUCT_B850 1
+#define VPD_PRODUCT_B650 2
+#define VPD_PRODUCT_B450 3
+
+struct vpd_cache {
+	uint8_t product_id;
+	uint8_t macbits;
+	unsigned char mac1[6];
+};
+
+/*
+ * Extracts MAC and product information from the VPD.
+ */
+static int vpd_callback(
+	void *userdata,
+	uint8_t id,
+	uint8_t version,
+	uint8_t type,
+	size_t size,
+	uint8_t const *data)
+{
+	struct vpd_cache *vpd = (struct vpd_cache *)userdata;
+
+	if (   id == VPD_BLOCK_HWID
+	    && version == 1
+	    && type != VPD_TYPE_INVALID
+	    && size >= 1) {
+		vpd->product_id = data[0];
+
+	} else if (   id == VPD_BLOCK_NETWORK
+		   && version == 1
+		   && type != VPD_TYPE_INVALID
+		   && size >= 6) {
+		vpd->macbits |= 1;
+		memcpy(vpd->mac1, data, 6);
+	}
+
+	return 0;
+}
+
+static void set_eth0_mac_address(unsigned char * mac)
+{
+	uint32_t *ENET_TCR = (uint32_t*)0x21880c4;
+	uint32_t *ENET_PALR = (uint32_t*)0x21880e4;
+	uint32_t *ENET_PAUR = (uint32_t*)0x21880e8;
+
+	*ENET_TCR |= 0x100;  /* ADDINS */
+	*ENET_PALR |= (mac[0] << 24) | (mac[1] << 16) | (mac[2] << 8) | mac[3];
+	*ENET_PAUR |= (mac[4] << 24) | (mac[5] << 16);
+}
+
+static void process_vpd(struct vpd_cache *vpd)
+{
+	if (   vpd->product_id == VPD_PRODUCT_B850
+	    || vpd->product_id == VPD_PRODUCT_B650
+	    || vpd->product_id == VPD_PRODUCT_B450) {
+		if (vpd->macbits & 1) {
+			set_eth0_mac_address(vpd->mac1);
+		}
+	}
+}
+
+static int read_vpd(uint eeprom_bus)
+{
+	struct vpd_cache vpd;
+	int res;
+	int size = 1024;
+	uint8_t *data;
+	unsigned int current_i2c_bus = i2c_get_bus_num();
+
+	res = i2c_set_bus_num(eeprom_bus);
+	if (res < 0)
+		return res;
+
+	data = (uint8_t *)malloc(size);
+	if (!data)
+		return -ENOMEM;
+
+	res = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
+			CONFIG_SYS_I2C_EEPROM_ADDR_LEN, data, size);
+
+	if (res == 0) {
+		memset(&vpd, 0, sizeof(vpd));
+		vpd_reader(size, data, &vpd, vpd_callback);
+		process_vpd(&vpd);
+	}
+
+	free(data);
+
+	i2c_set_bus_num(current_i2c_bus);
+	return res;
+}
+
 int board_eth_init(bd_t *bis)
 {
 	setup_iomux_enet();
@@ -586,6 +693,8 @@ int board_init(void)
 	setup_i2c(2, CONFIG_SYS_I2C_SPEED, 0x7f, &i2c_pad_info2);
 	setup_i2c(3, CONFIG_SYS_I2C_SPEED, 0x7f, &i2c_pad_info3);
 
+	read_vpd(CONFIG_SYS_I2C_EEPROM_BUS);
+
 	return 0;
 }
 

board/ge/bx50v3/vpd_reader.c

@@ -0,0 +1,228 @@
+/*
+ * Copyright 2016 General Electric Company
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include "vpd_reader.h"
+
+#include <linux/bch.h>
+#include <stdlib.h>
+
+
+/* BCH configuration */
+
+const struct {
+	int header_ecc_capability_bits;
+	int data_ecc_capability_bits;
+	unsigned int prim_poly;
+	struct {
+		int min;
+		int max;
+	} galois_field_order;
+} bch_configuration = {
+	.header_ecc_capability_bits = 4,
+	.data_ecc_capability_bits = 16,
+	.prim_poly = 0,
+	.galois_field_order = {
+		.min = 5,
+		.max = 15,
+	},
+};
+
+static int calculate_galois_field_order(size_t source_length)
+{
+	int gfo = bch_configuration.galois_field_order.min;
+
+	for (; gfo < bch_configuration.galois_field_order.max &&
+	     ((((1 << gfo) - 1) - ((int)source_length * 8)) < 0);
+	     gfo++) {
+	}
+
+	if (gfo == bch_configuration.galois_field_order.max) {
+		return -1;
+	}
+
+	return gfo + 1;
+}
+
+static int verify_bch(int ecc_bits, unsigned int prim_poly,
+	uint8_t * data, size_t data_length,
+	const uint8_t * ecc, size_t ecc_length)
+{
+	int gfo = calculate_galois_field_order(data_length);
+	if (gfo < 0) {
+		return -1;
+	}
+
+	struct bch_control * bch = init_bch(gfo, ecc_bits, prim_poly);
+	if (!bch) {
+		return -1;
+	}
+
+	if (bch->ecc_bytes != ecc_length) {
+		free_bch(bch);
+		return -1;
+	}
+
+	unsigned * errloc = (unsigned *)calloc(data_length, sizeof(unsigned));
+	int errors = decode_bch(
+			bch, data, data_length, ecc, NULL, NULL, errloc);
+	free_bch(bch);
+	if (errors < 0) {
+		free(errloc);
+		return -1;
+	}
+
+	if (errors > 0) {
+		for (int n = 0; n < errors; n++) {
+			if (errloc[n] >= 8 * data_length) {
+				/* n-th error located in ecc (no need for data correction) */
+			} else {
+				/* n-th error located in data */
+				data[errloc[n] / 8] ^= 1 << (errloc[n] % 8);
+			}
+		}
+	}
+
+	free(errloc);
+	return 0;
+}
+
+
+static const int ID = 0;
+static const int LEN = 1;
+static const int VER = 2;
+static const int TYP = 3;
+static const int BLOCK_SIZE = 4;
+
+static const uint8_t HEADER_BLOCK_ID = 0x00;
+static const uint8_t HEADER_BLOCK_LEN = 18;
+static const uint32_t HEADER_BLOCK_MAGIC = 0xca53ca53;
+static const size_t HEADER_BLOCK_VERIFY_LEN = 14;
+static const size_t HEADER_BLOCK_ECC_OFF = 14;
+static const size_t HEADER_BLOCK_ECC_LEN = 4;
+
+static const uint8_t ECC_BLOCK_ID = 0xFF;
+
+int vpd_reader(
+	size_t size,
+	uint8_t * data,
+	void * userdata,
+	int (*fn)(
+	    void * userdata,
+	    uint8_t id,
+	    uint8_t version,
+	    uint8_t type,
+	    size_t size,
+	    uint8_t const * data))
+{
+	if (   size < HEADER_BLOCK_LEN
+	    || data == NULL
+	    || fn == NULL) {
+		return -EINVAL;
+	}
+
+	/*
+	 * +--------------------+--------------------+--//--+--------------------+
+	 * | header block       | data block         | ...  | ecc block          |
+	 * +--------------------+--------------------+--//--+--------------------+
+	 * :                    :                           :
+	 * +------+-------+-----+                           +------+-------------+
+	 * | id   | magic | ecc |                           | ...  | ecc         |
+	 * | len  | off   |     |                           +------+-------------+
+	 * | ver  | size  |     |                           :
+	 * | type |       |     |                           :
+	 * +------+-------+-----+                           :
+	 * :              :     :                           :
+	 * <----- [1] ---->     <----------- [2] ----------->
+	 *
+	 * Repair (if necessary) the contents of header block [1] by using a
+	 * 4 byte ECC located at the end of the header block.  A successful
+	 * return value means that we can trust the header.
+	 */
+	int ret = verify_bch(
+		bch_configuration.header_ecc_capability_bits,
+		bch_configuration.prim_poly,
+		data,
+		HEADER_BLOCK_VERIFY_LEN,
+		&data[HEADER_BLOCK_ECC_OFF],
+		HEADER_BLOCK_ECC_LEN);
+	if (ret < 0) {
+		return ret;
+	}
+
+	/* Validate header block { id, length, version, type }. */
+	if (   data[ID] != HEADER_BLOCK_ID
+	    || data[LEN] != HEADER_BLOCK_LEN
+	    || data[VER] != 0
+	    || data[TYP] != 0
+	    || ntohl(*(uint32_t *)(&data[4])) != HEADER_BLOCK_MAGIC) {
+		return -EINVAL;
+	}
+
+	uint32_t offset = ntohl(*(uint32_t *)(&data[8]));
+	uint16_t size_bits = ntohs(*(uint16_t *)(&data[12]));
+
+	/* Check that ECC header fits. */
+	if (offset + 3 >= size) {
+		return -EINVAL;
+	}
+
+	/* Validate ECC block. */
+	uint8_t * ecc = &data[offset];
+	if (   ecc[ID] != ECC_BLOCK_ID
+	    || ecc[LEN] < BLOCK_SIZE
+	    || ecc[LEN] + offset > size
+	    || ecc[LEN] - BLOCK_SIZE != size_bits / 8
+	    || ecc[VER] != 1
+	    || ecc[TYP] != 1) {
+		return -EINVAL;
+	}
+
+	/*
+	 * Use the header block to locate the ECC block and verify the data
+	 * blocks [2] against the ecc block ECC.
+	 */
+	ret = verify_bch(
+		bch_configuration.data_ecc_capability_bits,
+		bch_configuration.prim_poly,
+		&data[data[LEN]],
+		offset - data[LEN],
+		&data[offset + BLOCK_SIZE],
+		ecc[LEN] - BLOCK_SIZE);
+	if (ret < 0) {
+		return ret;
+	}
+
+	/* Stop after ECC.  Ignore possible zero padding. */
+	size = offset;
+
+	for (;;) {
+		/* Move to next block. */
+		size -= data[LEN];
+		data += data[LEN];
+
+		if (size == 0) {
+			/* Finished iterating through blocks. */
+			return 0;
+		}
+
+		if (   size < BLOCK_SIZE
+		    || data[LEN] < BLOCK_SIZE) {
+			/* Not enough data for a header, or short header. */
+			return -EINVAL;
+		}
+
+		ret = fn(
+			userdata,
+			data[ID],
+			data[VER],
+			data[TYP],
+			data[LEN] - BLOCK_SIZE,
+			&data[BLOCK_SIZE]);
+		if (ret) {
+			return ret;
+		}
+	}
+}

board/ge/bx50v3/vpd_reader.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2016 General Electric Company
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include "common.h"
+
+/*
+ * Read VPD from given data, verify content, and call callback
+ * for each vital product data block.
+ *
+ * Returns Non-zero on error.  Negative numbers encode errno.
+ */
+int vpd_reader(
+	size_t size,
+	uint8_t * data,
+	void * userdata,
+	int (*fn)(
+	    void * userdata,
+	    uint8_t id,
+	    uint8_t version,
+	    uint8_t type,
+	    size_t size,
+	    uint8_t const * data));

include/configs/ge_bx50v3.h

@@ -299,4 +299,19 @@
 #define CONFIG_SYS_I2C_MXC_I2C2
 #define CONFIG_SYS_I2C_MXC_I2C3
 
+#define CONFIG_SYS_NUM_I2C_BUSES        9
+#define CONFIG_SYS_I2C_MAX_HOPS         1
+#define CONFIG_SYS_I2C_BUSES	{	{0, {I2C_NULL_HOP} }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 0} } }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 1} } }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 2} } }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 3} } }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 4} } }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 5} } }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 6} } }, \
+					{0, {{I2C_MUX_PCA9547, 0x70, 7} } }, \
+				}
+
+#define CONFIG_BCH
+
 #endif	/* __GE_BX50V3_CONFIG_H */