i2c: Add support for designware i2c controller

Earlier, a driver exists in the u-boot source for designware i2c interface. That
driver was specific to spear platforms. This patch implements the i2c controller
as a generic driver which can be used by multiple platforms

The driver files are now renamed to designware_i2c.c and designware_i2c.h and
these are moved into drivers/i2c folder for reusability by other
platforms

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>

3 files changed, 149 insertions, 3 deletions

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 42913f7..5dbdbe3 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -27,6 +27,7 @@ LIB	:= $(obj)libi2c.o
 
 COBJS-$(CONFIG_BFIN_TWI_I2C) += bfin-twi_i2c.o
 COBJS-$(CONFIG_DRIVER_DAVINCI_I2C) += davinci_i2c.o
+COBJS-$(CONFIG_DW_I2C) += designware_i2c.o
 COBJS-$(CONFIG_FSL_I2C) += fsl_i2c.o
 COBJS-$(CONFIG_I2C_MVTWSI) += mvtwsi.o
 COBJS-$(CONFIG_I2C_MV) += mv_i2c.o
@@ -40,7 +41,6 @@ COBJS-$(CONFIG_PPC4XX_I2C) += ppc4xx_i2c.o
 COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
 COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
 COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o
-COBJS-$(CONFIG_SPEAR_I2C) += spr_i2c.o
 COBJS-$(CONFIG_TEGRA_I2C) += tegra_i2c.o
 COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
 COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
diff --git a/drivers/i2c/spr_i2c.c b/drivers/i2c/designware_i2c.c
index eabfe84..d352146 100644
--- a/drivers/i2c/spr_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -24,7 +24,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
-#include <asm/arch/spr_i2c.h>
+#include "designware_i2c.h"
 
 static struct i2c_regs *const i2c_regs_p =
     (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
@@ -113,7 +113,7 @@ int i2c_get_bus_speed(void)
 /*
  * i2c_init - Init function
  * @speed:	required i2c speed
- * @slaveadd:	slave address for the spear device
+ * @slaveadd:	slave address for the device
  *
  * Initialization function.
  */
diff --git a/drivers/i2c/designware_i2c.h b/drivers/i2c/designware_i2c.h
new file mode 100644
index 0000000..03b520e
--- /dev/null
+++ b/drivers/i2c/designware_i2c.h
@@ -0,0 +1,146 @@
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __DW_I2C_H_
+#define __DW_I2C_H_
+
+struct i2c_regs {
+	u32 ic_con;
+	u32 ic_tar;
+	u32 ic_sar;
+	u32 ic_hs_maddr;
+	u32 ic_cmd_data;
+	u32 ic_ss_scl_hcnt;
+	u32 ic_ss_scl_lcnt;
+	u32 ic_fs_scl_hcnt;
+	u32 ic_fs_scl_lcnt;
+	u32 ic_hs_scl_hcnt;
+	u32 ic_hs_scl_lcnt;
+	u32 ic_intr_stat;
+	u32 ic_intr_mask;
+	u32 ic_raw_intr_stat;
+	u32 ic_rx_tl;
+	u32 ic_tx_tl;
+	u32 ic_clr_intr;
+	u32 ic_clr_rx_under;
+	u32 ic_clr_rx_over;
+	u32 ic_clr_tx_over;
+	u32 ic_clr_rd_req;
+	u32 ic_clr_tx_abrt;
+	u32 ic_clr_rx_done;
+	u32 ic_clr_activity;
+	u32 ic_clr_stop_det;
+	u32 ic_clr_start_det;
+	u32 ic_clr_gen_call;
+	u32 ic_enable;
+	u32 ic_status;
+	u32 ic_txflr;
+	u32 ix_rxflr;
+	u32 reserved_1;
+	u32 ic_tx_abrt_source;
+};
+
+#define IC_CLK			166
+#define NANO_TO_MICRO		1000
+
+/* High and low times in different speed modes (in ns) */
+#define MIN_SS_SCL_HIGHTIME	4000
+#define MIN_SS_SCL_LOWTIME	5000
+#define MIN_FS_SCL_HIGHTIME	800
+#define MIN_FS_SCL_LOWTIME	1700
+#define MIN_HS_SCL_HIGHTIME	60
+#define MIN_HS_SCL_LOWTIME	160
+
+/* Worst case timeout for 1 byte is kept as 2ms */
+#define I2C_BYTE_TO		(CONFIG_SYS_HZ/500)
+#define I2C_STOPDET_TO		(CONFIG_SYS_HZ/500)
+#define I2C_BYTE_TO_BB		(I2C_BYTE_TO * 16)
+
+/* i2c control register definitions */
+#define IC_CON_SD		0x0040
+#define IC_CON_RE		0x0020
+#define IC_CON_10BITADDRMASTER	0x0010
+#define IC_CON_10BITADDR_SLAVE	0x0008
+#define IC_CON_SPD_MSK		0x0006
+#define IC_CON_SPD_SS		0x0002
+#define IC_CON_SPD_FS		0x0004
+#define IC_CON_SPD_HS		0x0006
+#define IC_CON_MM		0x0001
+
+/* i2c target address register definitions */
+#define TAR_ADDR		0x0050
+
+/* i2c slave address register definitions */
+#define IC_SLAVE_ADDR		0x0002
+
+/* i2c data buffer and command register definitions */
+#define IC_CMD			0x0100
+
+/* i2c interrupt status register definitions */
+#define IC_GEN_CALL		0x0800
+#define IC_START_DET		0x0400
+#define IC_STOP_DET		0x0200
+#define IC_ACTIVITY		0x0100
+#define IC_RX_DONE		0x0080
+#define IC_TX_ABRT		0x0040
+#define IC_RD_REQ		0x0020
+#define IC_TX_EMPTY		0x0010
+#define IC_TX_OVER		0x0008
+#define IC_RX_FULL		0x0004
+#define IC_RX_OVER 		0x0002
+#define IC_RX_UNDER		0x0001
+
+/* fifo threshold register definitions */
+#define IC_TL0			0x00
+#define IC_TL1			0x01
+#define IC_TL2			0x02
+#define IC_TL3			0x03
+#define IC_TL4			0x04
+#define IC_TL5			0x05
+#define IC_TL6			0x06
+#define IC_TL7			0x07
+#define IC_RX_TL		IC_TL0
+#define IC_TX_TL		IC_TL0
+
+/* i2c enable register definitions */
+#define IC_ENABLE_0B		0x0001
+
+/* i2c status register  definitions */
+#define IC_STATUS_SA		0x0040
+#define IC_STATUS_MA		0x0020
+#define IC_STATUS_RFF		0x0010
+#define IC_STATUS_RFNE		0x0008
+#define IC_STATUS_TFE		0x0004
+#define IC_STATUS_TFNF		0x0002
+#define IC_STATUS_ACT		0x0001
+
+/* Speed Selection */
+#define IC_SPEED_MODE_STANDARD	1
+#define IC_SPEED_MODE_FAST	2
+#define IC_SPEED_MODE_MAX	3
+
+#define I2C_MAX_SPEED		3400000
+#define I2C_FAST_SPEED		400000
+#define I2C_STANDARD_SPEED	100000
+
+#endif /* __DW_I2C_H_ */