ARM: AM33XX: Add i2c support

Add i2c driver board hookup for AM335X EVM

Signed-off-by: Chandan Nath <chandan.nath@ti.com>
Signed-off-by: Patil, Rachna <rachna@ti.com>

4 files changed, 89 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/am33xx/clock.c b/arch/arm/cpu/armv7/am33xx/clock.c
index 98cfd93814..bbb9c1353f 100644
--- a/arch/arm/cpu/armv7/am33xx/clock.c
+++ b/arch/arm/cpu/armv7/am33xx/clock.c
@@ -113,6 +113,11 @@ static void enable_per_clocks(void)
 	writel(PRCM_MOD_EN, &cmper->mmc0clkctrl);
 	while (readl(&cmper->mmc0clkctrl) != PRCM_MOD_EN)
 		;
+
+	/* i2c0 */
+	writel(PRCM_MOD_EN, &cmwkup->wkup_i2c0ctrl);
+	while (readl(&cmwkup->wkup_i2c0ctrl) != PRCM_MOD_EN)
+		;
 }
 
 static void mpu_pll_config(void)
diff --git a/arch/arm/include/asm/arch-am33xx/common_def.h b/arch/arm/include/asm/arch-am33xx/common_def.h
index 767932daea..aa3b554536 100644
--- a/arch/arm/include/asm/arch-am33xx/common_def.h
+++ b/arch/arm/include/asm/arch-am33xx/common_def.h
@@ -18,5 +18,6 @@
 
 extern void enable_uart0_pin_mux(void);
 extern void enable_mmc0_pin_mux(void);
+extern void enable_i2c0_pin_mux(void);
 
 #endif/*__COMMON_DEF_H__ */
diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h
index 25558a2b2c..cd002e632d 100644
--- a/arch/arm/include/asm/arch-am33xx/cpu.h
+++ b/arch/arm/include/asm/arch-am33xx/cpu.h
@@ -95,7 +95,8 @@ struct cm_wkuppll {
 	unsigned int divm2dpllper;	/* offset 0xAC */
 	unsigned int resv11[1];
 	unsigned int wkup_uart0ctrl;	/* offset 0xB4 */
-	unsigned int resv12[8];
+	unsigned int wkup_i2c0ctrl;	/* offset 0xB8 */
+	unsigned int resv12[7];
 	unsigned int divm6dpllcore;	/* offset 0xD8 */
 };
 
diff --git a/arch/arm/include/asm/arch-am33xx/i2c.h b/arch/arm/include/asm/arch-am33xx/i2c.h
new file mode 100644
index 0000000000..366e2bbec5
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/i2c.h
@@ -0,0 +1,81 @@
+/*
+ * (C) Copyright 2012
+ * Texas Instruments, <www.ti.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 _I2C_H_
+#define _I2C_H_
+
+#define  I2C_BASE1		0x44E0B000
+#define  I2C_BASE2		0x4802A000
+#define  I2C_BASE3		0x4819C000
+#define	 I2C_BUS_MAX		3
+
+#define I2C_DEFAULT_BASE		I2C_BASE1
+
+struct i2c {
+	unsigned short revnb_lo;        /* 0x00 */
+	unsigned short res1;
+	unsigned short revnb_hi;        /* 0x04 */
+	unsigned short res2[13];
+	unsigned short sysc;            /* 0x20 */
+	unsigned short res3;
+	unsigned short irqstatus_raw;   /* 0x24 */
+	unsigned short res4;
+	unsigned short stat;            /* 0x28 */
+	unsigned short res5;
+	unsigned short ie;              /* 0x2C */
+	unsigned short res6;
+	unsigned short irqenable_clr;   /* 0x30 */
+	unsigned short res7;
+	unsigned short iv;              /* 0x34 */
+	unsigned short res8[45];
+	unsigned short syss;            /* 0x90 */
+	unsigned short res9;
+	unsigned short buf;             /* 0x94 */
+	unsigned short res10;
+	unsigned short cnt;             /* 0x98 */
+	unsigned short res11;
+	unsigned short data;            /* 0x9C */
+	unsigned short res13;
+	unsigned short res14;           /* 0xA0 */
+	unsigned short res15;
+	unsigned short con;             /* 0xA4 */
+	unsigned short res16;
+	unsigned short oa;              /* 0xA8 */
+	unsigned short res17;
+	unsigned short sa;              /* 0xAC */
+	unsigned short res18;
+	unsigned short psc;             /* 0xB0 */
+	unsigned short res19;
+	unsigned short scll;            /* 0xB4 */
+	unsigned short res20;
+	unsigned short sclh;            /* 0xB8 */
+	unsigned short res21;
+	unsigned short systest;         /* 0xBC */
+	unsigned short res22;
+	unsigned short bufstat;         /* 0xC0 */
+	unsigned short res23;
+};
+
+#define I2C_IP_CLK			48000000
+#define I2C_INTERNAL_SAMLPING_CLK	12000000
+
+#endif /* _I2C_H_ */