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ARM: AM33XX: Add i2c support

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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>
This commit is contained in:
Patil, Rachna 2012-01-22 23:47:01 +00:00 • committed by Heiko Schocher
parent 498cbdfe62
commit b4116ede36
7 changed files with 118 additions and 1 deletions
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5
arch/arm/cpu/armv7/am33xx/clock.c
View file

@ -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)

1
arch/arm/include/asm/arch-am33xx/common_def.h
View file

@ -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__ */

3
arch/arm/include/asm/arch-am33xx/cpu.h
View file

@ -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 */
};

81
arch/arm/include/asm/arch-am33xx/i2c.h Normal file
View file

@ -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_ */

7
board/ti/am335x/evm.c
View file

@ -18,6 +18,7 @@
#include <asm/arch/hardware.h>
#include <asm/arch/common_def.h>
#include <serial.h>
#include <i2c.h>
DECLARE_GLOBAL_DATA_PTR;
@ -42,6 +43,12 @@ int init_basic_setup(void)
int board_init(void)
{
enable_uart0_pin_mux();
#ifdef CONFIG_I2C
enable_i2c0_pin_mux();
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
#endif
init_basic_setup();
return 0;

13
board/ti/am335x/mux.c
View file

@ -272,6 +272,14 @@ static struct module_pin_mux mmc0_pin_mux[] = {
};
#endif
static struct module_pin_mux i2c0_pin_mux[] = {
{OFFSET(i2c0_sda), (MODE(0) | RXACTIVE |
PULLUDEN | SLEWCTRL)}, /* I2C_DATA */
{OFFSET(i2c0_scl), (MODE(0) | RXACTIVE |
PULLUDEN | SLEWCTRL)}, /* I2C_SCLK */
{-1},
};
/*
* Configure the pin mux for the module
*/
@ -297,3 +305,8 @@ void enable_mmc0_pin_mux(void)
configure_module_pin_mux(mmc0_pin_mux);
}
#endif
void enable_i2c0_pin_mux(void)
{
configure_module_pin_mux(i2c0_pin_mux);
}

9
include/configs/am335x_evm.h
View file

@ -103,6 +103,14 @@
#define CONFIG_SYS_NS16550_CLK (48000000)
#define CONFIG_SYS_NS16550_COM1 0x44e09000 /* Base EVM has UART0 */
/* I2C Configuration */
#define CONFIG_I2C
#define CONFIG_CMD_I2C
#define CONFIG_HARD_I2C
#define CONFIG_SYS_I2C_SPEED 100000
#define CONFIG_SYS_I2C_SLAVE 1
#define CONFIG_DRIVER_OMAP24XX_I2C
#define CONFIG_BAUDRATE 115200
#define CONFIG_SYS_BAUDRATE_TABLE { 110, 300, 600, 1200, 2400, \
4800, 9600, 14400, 19200, 28800, 38400, 56000, 57600, 115200 }
@ -131,6 +139,7 @@
#define CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME "u-boot.img"
#define CONFIG_SPL_MMC_SUPPORT
#define CONFIG_SPL_FAT_SUPPORT
#define CONFIG_SPL_I2C_SUPPORT
#define CONFIG_SPL_LIBCOMMON_SUPPORT
#define CONFIG_SPL_LIBDISK_SUPPORT