[U-Boot] [PATCH 1/6] ti: common: dra7: Add standard access for board description EEPROM

[Lokesh Vutla]

DRA7 EVM revH and later EVMs have EEPROM populated that can contain board
description information such as name, revision, DDR definition, etc. Adding
support for this EEPROM format.

Acked-by: Nishanth Menon <nm at ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
---
 board/ti/common/board_detect.c | 64 ++++++++++++++++++++++++++++++++++++++++++
 board/ti/common/board_detect.h | 56 ++++++++++++++++++++++++++++++++++++
 2 files changed, 120 insertions(+)

diff --git a/board/ti/common/board_detect.c b/board/ti/common/board_detect.c
index 6cf4859..e0ae1a5 100644
--- a/board/ti/common/board_detect.c
+++ b/board/ti/common/board_detect.c
@@ -160,6 +160,50 @@ already_read:
 	return 0;
 }
 
+int __maybe_unused ti_i2c_eeprom_dra7_get(int bus_addr, int dev_addr)
+{
+	int rc, offset = 0;
+	struct dra7_eeprom dra7_ep;
+	struct ti_common_eeprom *ep;
+
+	ep = TI_EEPROM_DATA;
+	if (ep->header == DRA7_EEPROM_HEADER_MAGIC)
+		goto already_read;
+
+	/* Initialize with a known bad marker for i2c fails.. */
+	ep->header = 0xADEAD12C;
+	ep->name[0] = 0x0;
+	ep->version[0] = 0x0;
+	ep->serial[0] = 0x0;
+	ep->emif1_size = 0;
+	ep->emif2_size = 0;
+
+	rc = ti_i2c_eeprom_get(bus_addr, dev_addr, DRA7_EEPROM_HEADER_MAGIC,
+			       sizeof(dra7_ep), (uint8_t *)&dra7_ep);
+	if (rc)
+		return rc;
+
+	ep->header = dra7_ep.header;
+	strlcpy(ep->name, dra7_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
+	ti_eeprom_string_cleanup(ep->name);
+
+	offset = dra7_ep.version_major - 1;
+
+	/* Rev F is skipped */
+	if (offset >= 5)
+		offset = offset + 1;
+	snprintf(ep->version, TI_EEPROM_HDR_REV_LEN + 1, "%c.%d",
+		 'A' + offset, dra7_ep.version_minor);
+	ti_eeprom_string_cleanup(ep->version);
+	ep->emif1_size = (u64)dra7_ep.emif1_size;
+	ep->emif2_size = (u64)dra7_ep.emif2_size;
+	strlcpy(ep->config, dra7_ep.config, TI_EEPROM_HDR_CONFIG_LEN + 1);
+	ti_eeprom_string_cleanup(ep->config);
+
+already_read:
+	return 0;
+}
+
 bool __maybe_unused board_ti_is(char *name_tag)
 {
 	struct ti_common_eeprom *ep = TI_EEPROM_DATA;
@@ -230,6 +274,26 @@ fail:
 	memset(mac_addr, 0, TI_EEPROM_HDR_ETH_ALEN);
 }
 
+u64 __maybe_unused board_ti_get_emif1_size(void)
+{
+	struct ti_common_eeprom *ep = TI_EEPROM_DATA;
+
+	if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
+		return 0;
+
+	return ep->emif1_size;
+}
+
+u64 __maybe_unused board_ti_get_emif2_size(void)
+{
+	struct ti_common_eeprom *ep = TI_EEPROM_DATA;
+
+	if (ep->header != DRA7_EEPROM_HEADER_MAGIC)
+		return 0;
+
+	return ep->emif2_size;
+}
+
 void __maybe_unused set_board_info_env(char *name)
 {
 	char *unknown = "unknown";
diff --git a/board/ti/common/board_detect.h b/board/ti/common/board_detect.h
index c17ab34..eb17f6f 100644
--- a/board/ti/common/board_detect.h
+++ b/board/ti/common/board_detect.h
@@ -44,6 +44,37 @@ struct ti_am_eeprom {
 	char mac_addr[TI_EEPROM_HDR_NO_OF_MAC_ADDR][TI_EEPROM_HDR_ETH_ALEN];
 } __attribute__ ((__packed__));
 
+/* DRA7 EEPROM MAGIC Header identifier */
+#define DRA7_EEPROM_HEADER_MAGIC	0xAA5533EE
+#define DRA7_EEPROM_HDR_NAME_LEN	16
+#define DRA7_EEPROM_HDR_CONFIG_LEN	4
+
+/**
+ * struct dra7_eeprom - This structure holds data read in from the DRA7 EVM
+ *			EEPROMs.
+ * @header: This holds the magic number
+ * @name: The name of the board
+ * @version_major: Board major version
+ * @version_minor: Board minor version
+ * @config: Board specific config options
+ * @emif1_size: Size of DDR attached to EMIF1
+ * @emif2_size: Size of DDR attached to EMIF2
+ *
+ * The data is this structure is read from the EEPROM on the board.
+ * It is used for board detection which is based on name. It is used
+ * to configure specific DRA7 boards. This allows booting of multiple
+ * DRA7 boards with a single MLO and u-boot.
+ */
+struct dra7_eeprom {
+	u32 header;
+	char name[DRA7_EEPROM_HDR_NAME_LEN];
+	u16 version_major;
+	u16 version_minor;
+	char config[DRA7_EEPROM_HDR_CONFIG_LEN];
+	u32 emif1_size;
+	u32 emif2_size;
+} __attribute__ ((__packed__));
+
 /**
  * struct ti_common_eeprom - Null terminated, usable EEPROM contents.
  * header:	Magic number
@@ -52,6 +83,8 @@ struct ti_am_eeprom {
  * @serial:	NULL terminated serial number
  * @config:	NULL terminated Board specific config options
  * @mac_addr:	MAC addresses
+ * @emif1_size:	Size of the ddr available on emif1
+ * @emif2_size:	Size of the ddr available on emif2
  */
 struct ti_common_eeprom {
 	u32 header;
@@ -60,6 +93,8 @@ struct ti_common_eeprom {
 	char serial[TI_EEPROM_HDR_SERIAL_LEN + 1];
 	char config[TI_EEPROM_HDR_CONFIG_LEN + 1];
 	char mac_addr[TI_EEPROM_HDR_NO_OF_MAC_ADDR][TI_EEPROM_HDR_ETH_ALEN];
+	u64 emif1_size;
+	u64 emif2_size;
 };
 
 #define TI_EEPROM_DATA ((struct ti_common_eeprom *)\
@@ -76,6 +111,13 @@ struct ti_common_eeprom {
 int ti_i2c_eeprom_am_get(int bus_addr, int dev_addr);
 
 /**
+ * ti_i2c_eeprom_dra7_get() - Consolidated eeprom data for DRA7 TI EVMs
+ * @bus_addr:	I2C bus address
+ * @dev_addr:	I2C slave address
+ */
+int ti_i2c_eeprom_dra7_get(int bus_addr, int dev_addr);
+
+/**
  * board_ti_is() - Board detection logic for TI EVMs
  * @name_tag:	Tag used in eeprom for the board
  *
@@ -130,6 +172,20 @@ char *board_ti_get_name(void);
 void board_ti_get_eth_mac_addr(int index, u8 mac_addr[TI_EEPROM_HDR_ETH_ALEN]);
 
 /**
+ * board_ti_get_emif1_size() - Get size of the DDR on emif1 for TI EVMs
+ *
+ * Return: NULL if eeprom was'nt read or emif1_size is not available.
+ */
+u64 board_ti_get_emif1_size(void);
+
+/**
+ * board_ti_get_emif2_size() - Get size of the DDR on emif2 for TI EVMs
+ *
+ * Return: NULL if eeprom was'nt read or emif2_size is not available.
+ */
+u64 board_ti_get_emif2_size(void);
+
+/**
  * set_board_info_env() - Setup commonly used board information environment vars
  * @name:	Name of the board
  *
-- 
2.1.4