From 110f2ead7b0bdd67a5e9f9fe58ccf93287182bf0 Mon Sep 17 00:00:00 2001
From: =?utf8?q?=E5=BC=A0=E6=99=B4?= <zhangqing@rock-chips.com>
Date: Fri, 14 Sep 2012 11:17:00 +0800
Subject: [PATCH] rk2928:a720:support i2c_sram

---
 arch/arm/mach-rk2928/i2c_sram.c | 364 ++++++++++++++++++++++++++++++++
 1 file changed, 364 insertions(+)
 create mode 100755 arch/arm/mach-rk2928/i2c_sram.c

diff --git a/arch/arm/mach-rk2928/i2c_sram.c b/arch/arm/mach-rk2928/i2c_sram.c
new file mode 100755
index 000000000000..f93a20cfe5ad
--- /dev/null
+++ b/arch/arm/mach-rk2928/i2c_sram.c
@@ -0,0 +1,364 @@
+#include <linux/io.h>
+#include <mach/board.h>
+#include <mach/sram.h>
+#include <mach/iomux.h>
+#include <mach/cru.h>
+#include <asm/io.h>
+#include <mach/gpio.h>
+
+#define cru_readl(offset)	readl_relaxed(RK2928_CRU_BASE + offset)
+#define cru_writel(v, offset)	do { writel_relaxed(v, RK2928_CRU_BASE + offset); dsb(); } while (0)
+
+#if defined(CONFIG_RK30_I2C_INSRAM)
+
+/******************need set when you use i2c*************************/
+#define I2C_SPEED 100
+#define I2C_SADDR               (0x2D)        /* slave address ,wm8310 addr is 0x34*/
+#define SRAM_I2C_CH 1	//CH==0, i2c0,CH==1, i2c1,CH==2, i2c2,CH==3, i2c3
+#if defined (CONFIG_MACH_RK2928_SDK)
+#define SRAM_I2C_ADDRBASE (RK2928_RKI2C1_BASE )//RK29_I2C0_BASE\RK29_I2C2_BASE\RK29_I2C3_BASE
+#else
+#define SRAM_I2C_ADDRBASE (RK2928_RKI2C0_BASE )
+#endif
+
+#define I2C_SLAVE_ADDR_LEN 1  // 2:slav addr is 10bit ,1:slav addr is 7bit
+#define I2C_SLAVE_REG_LEN 1   // 2:slav reg addr is 16 bit ,1:is 8 bit
+#define SRAM_I2C_DATA_BYTE 1  //i2c transmission data is 1bit(8wei) or 2bit(16wei)
+#define GRF_GPIO_IOMUX 0xd4 //GRF_GPIO2D_IOMUX
+/*ch=0:GRF_GPIO2L_IOMUX,ch=1:GRF_GPIO1L_IOMUX,ch=2:GRF_GPIO5H_IOMUX,ch=3:GRF_GPIO2L_IOMUX*/
+#define I2C_GRF_GPIO_IOMUX (0x01<<14)|(0x01<<12)
+/*CH=0:(~(0x03<<30))&(~(0x03<<28))|(0x01<<30)|(0x01<<28),CH=1:(~(0x03<<14))&(~(0x03<<12))|(0x01<<14)|(0x01<<12),
+CH=2:(~(0x03<<24))&(~(0x03<<22))|(0x01<<24)|(0x01<<22),CH=3:(~(0x03<<26))&(~(0x03<<24))|(0x02<<26)|(0x02<<24)*/
+/***************************************/
+
+#define I2C_SLAVE_TYPE (((I2C_SLAVE_ADDR_LEN-1)<<4)|((I2C_SLAVE_REG_LEN-1)))
+
+#define uint8 unsigned char
+#define uint16 unsigned short
+#define uint32 unsigned int
+uint32 __sramdata data[5];
+uint8 __sramdata arm_voltage = 0;
+
+#define CRU_CLKGATE0_CON   0xd0
+#define CRU_CLKGATE8_CON	0xf0
+#define CRU_CLKSEL1_CON		0x48
+#define GRF_GPIO5H_IOMUX	0x74
+#define GRF_GPIO2L_IOMUX    	0x58
+#define GRF_GPIO1L_IOMUX    	0x50
+
+#define COMPLETE_READ     (1<<STATE_START|1<<STATE_READ|1<<STATE_STOP)
+#define COMPLETE_WRITE     (1<<STATE_START|1<<STATE_WRITE|1<<STATE_STOP)
+
+/* Control register */
+#define I2C_CON                 0x0000
+#define I2C_CON_EN              (1 << 0)
+#define I2C_CON_MOD(mod)        ((mod) << 1)
+#define I2C_CON_MASK            (3 << 1)
+enum{
+        I2C_CON_MOD_TX = 0,
+        I2C_CON_MOD_TRX,
+        I2C_CON_MOD_RX,
+        I2C_CON_MOD_RRX,
+};
+#define I2C_CON_START           (1 << 3)
+#define I2C_CON_STOP            (1 << 4)
+#define I2C_CON_LASTACK         (1 << 5)
+#define I2C_CON_ACTACK          (1 << 6)
+
+/* Clock dividor register */
+#define I2C_CLKDIV              0x0004
+#define I2C_CLKDIV_VAL(divl, divh) (((divl) & 0xffff) | (((divh) << 16) & 0xffff0000))  
+#define rk30_ceil(x, y) \
+	({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
+
+/* the slave address accessed  for master rx mode */
+#define I2C_MRXADDR             0x0008
+#define I2C_MRXADDR_LOW         (1 << 24)
+#define I2C_MRXADDR_MID         (1 << 25)
+#define I2C_MRXADDR_HIGH        (1 << 26)
+
+/* the slave register address accessed  for master rx mode */
+#define I2C_MRXRADDR            0x000c
+#define I2C_MRXRADDR_LOW        (1 << 24)
+#define I2C_MRXRADDR_MID        (1 << 25)
+#define I2C_MRXRADDR_HIGH       (1 << 26)
+
+/* master tx count */
+#define I2C_MTXCNT              0x0010
+
+/* master rx count */
+#define I2C_MRXCNT              0x0014
+
+/* interrupt enable register */
+#define I2C_IEN                 0x0018
+#define I2C_BTFIEN              (1 << 0)
+#define I2C_BRFIEN              (1 << 1)
+#define I2C_MBTFIEN             (1 << 2)
+#define I2C_MBRFIEN             (1 << 3)
+#define I2C_STARTIEN            (1 << 4)
+#define I2C_STOPIEN             (1 << 5)
+#define I2C_NAKRCVIEN           (1 << 6)
+#define IRQ_MST_ENABLE          (I2C_MBTFIEN | I2C_MBRFIEN | I2C_NAKRCVIEN | I2C_STARTIEN | I2C_STOPIEN)
+#define IRQ_ALL_DISABLE         0
+
+/* interrupt pending register */
+#define I2C_IPD                 0x001c
+#define I2C_BTFIPD              (1 << 0)
+#define I2C_BRFIPD              (1 << 1)
+#define I2C_MBTFIPD             (1 << 2)
+#define I2C_MBRFIPD             (1 << 3)
+#define I2C_STARTIPD            (1 << 4)
+#define I2C_STOPIPD             (1 << 5)
+#define I2C_NAKRCVIPD           (1 << 6)
+#define I2C_IPD_ALL_CLEAN       0x7f
+
+/* finished count */
+#define I2C_FCNT                0x0020
+
+/* I2C tx data register */
+#define I2C_TXDATA_BASE         0X0100
+
+/* I2C rx data register */
+#define I2C_RXDATA_BASE         0x0200
+
+void __sramfunc sram_i2c_enable(void);
+void __sramfunc sram_i2c_disenable(void);
+
+void __sramfunc sram_printch(char byte);
+void __sramfunc sram_printhex(unsigned int hex);
+
+#define sram_udelay(usecs)	SRAM_LOOP((usecs)*SRAM_LOOPS_PER_USEC)
+
+/*-------------------------------------------------------------------------------------------------------
+Name      : sram_i2c_init
+Desc      : initialize the necessary registers
+Params    : channel-determine which I2C bus we used
+Return    : none
+------------------------------------------------------------------------------------------------------*/
+
+void __sramfunc sram_i2c_init()
+{
+	  unsigned int div, divl, divh;
+    //enable cru_clkgate8 clock
+    data[1] = cru_readl(CLK_GATE_CLKID_CONS(CLK_GATE_CLKID(8)));
+    
+	#if defined (CONFIG_MACH_RK2928_SDK)
+    cru_writel(CLK_GATE_W_MSK(CLK_GATE_PCLK_I2C1)|CLK_UN_GATE(CLK_GATE_PCLK_I2C1), 
+		CLK_GATE_CLKID_CONS(CLK_GATE_PCLK_I2C1));
+	#else
+    cru_writel(CLK_GATE_W_MSK(CLK_GATE_PCLK_I2C0)|CLK_UN_GATE(CLK_GATE_PCLK_I2C0), 
+		CLK_GATE_CLKID_CONS(CLK_GATE_PCLK_I2C0));
+	#endif
+	
+    data[2] = readl_relaxed(RK2928_GRF_BASE + GRF_GPIO_IOMUX);
+    writel_relaxed(data[2]| I2C_GRF_GPIO_IOMUX, RK2928_GRF_BASE + GRF_GPIO_IOMUX);
+	
+	div = rk30_ceil(24*1000*1000, I2C_SPEED*1000 * 8);
+	divh = divl = rk30_ceil(div, 2);	
+	writel_relaxed(I2C_CLKDIV_VAL(divl, divh), SRAM_I2C_ADDRBASE + I2C_CLKDIV);
+	data[3]  = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CLKDIV);
+	
+}
+
+
+/*-------------------------------------------------------------------------------------------------------
+Name      : sram_i2c_deinit
+Desc      : de-initialize the necessary registers
+Params    : noe
+Return    : none
+------------------------------------------------------------------------------------------------------*/
+void __sramfunc sram_i2c_deinit(void)
+{
+    //restore iomux reg
+    writel_relaxed(data[2], RK2928_GRF_BASE + GRF_GPIO_IOMUX);
+
+    //restore scu clock reg
+    cru_writel(data[1], CLK_GATE_CLKID_CONS(CLK_GATE_PCLK_I2C1));
+
+
+}
+
+/*-------------------------------------------------------------------------------------------------------
+Name      : sram_i2c_start
+Desc      : start i2c
+Params    : none
+Return    : none
+------------------------------------------------------------------------------------------------------*/
+void __sramfunc sram_i2c_read_enable(void)
+{
+	writel_relaxed(((((I2C_CON_EN | I2C_CON_MOD(1)) | I2C_CON_LASTACK) )| I2C_CON_START) & (~(I2C_CON_STOP)) , SRAM_I2C_ADDRBASE + I2C_CON);
+}
+void __sramfunc sram_i2c_write_enable(void)
+{
+	writel_relaxed(((((I2C_CON_EN | I2C_CON_MOD(0)) | I2C_CON_LASTACK) )| I2C_CON_START) & (~(I2C_CON_STOP)) , SRAM_I2C_ADDRBASE + I2C_CON);
+}
+
+void __sramfunc sram_i2c_disenable(void)
+{
+    writel_relaxed(0, SRAM_I2C_ADDRBASE + I2C_CON);
+}
+
+void __sramfunc sram_i2c_clean_start(void)
+{
+        unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
+
+        con = (con & (~I2C_CON_START)) ;
+        writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
+}
+void __sramfunc sram_i2c_send_start(void)
+{
+        unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
+        con |= I2C_CON_START;
+        if(con & I2C_CON_STOP)
+			sram_printch('E');
+        writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
+}
+void __sramfunc sram_i2c_send_stop(void)
+{
+        unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
+		con &=	~I2C_CON_START;
+        con |= I2C_CON_STOP;
+        if(con & I2C_CON_START) 
+			sram_printch('E');
+        writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
+}
+void __sramfunc sram_i2c_clean_stop(void)
+{
+        unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
+
+        con = (con & (~I2C_CON_STOP)) ;
+        writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
+}
+
+void __sramfunc sram_i2c_get_ipd_event(int type)
+{
+	int time = 2000;
+	unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_IPD);
+	writel_relaxed(type, SRAM_I2C_ADDRBASE + I2C_IEN);
+	do{
+		sram_udelay(10);
+		con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_IPD);
+	}while(((--time) & (~(con & type))));
+	writel_relaxed(type,SRAM_I2C_ADDRBASE + I2C_IPD);
+	
+	if(time <= 0){
+	sram_printch('T');
+	}
+}
+
+void __sramfunc sram_i2c_write_prepare(uint8 I2CSlaveAddr, uint8 regAddr,uint8 pdata)
+{
+    u32 data = 0;
+    unsigned int addr = (I2CSlaveAddr & 0x7f) << 1;
+
+ 	data = (addr | (regAddr << 8))|(pdata << 16);
+    writel_relaxed(data , SRAM_I2C_ADDRBASE + I2C_TXDATA_BASE);
+   	writel_relaxed(3, SRAM_I2C_ADDRBASE + I2C_MTXCNT);
+}
+uint8 __sramfunc sram_i2c_read_prepare(uint8 I2CSlaveAddr, uint8 regAddr)
+{
+	unsigned int addr = (I2CSlaveAddr & 0x7f) << 1;
+ 
+  	 writel_relaxed(addr | I2C_MRXADDR_LOW, SRAM_I2C_ADDRBASE + I2C_MRXADDR);
+     writel_relaxed(regAddr | I2C_MRXADDR_LOW, SRAM_I2C_ADDRBASE + I2C_MRXRADDR);
+    writel_relaxed(SRAM_I2C_DATA_BYTE, SRAM_I2C_ADDRBASE + I2C_MRXCNT);
+	return 0;
+}
+
+uint8 __sramfunc sram_i2c_read_get_data(uint8 I2CSlaveAddr, uint8 regAddr)
+{
+	unsigned int ret;
+    ret =  readl_relaxed(SRAM_I2C_ADDRBASE + I2C_RXDATA_BASE);
+	ret = ret & 0x000000ff;
+	return ret;
+	
+}
+uint8 __sramfunc sram_i2c_write(uint8 I2CSlaveAddr, uint8 regAddr,uint8 data)
+{
+	sram_i2c_write_enable();
+	sram_i2c_get_ipd_event(I2C_STARTIPD);
+	sram_i2c_clean_start();
+	
+	sram_i2c_write_prepare(I2CSlaveAddr,regAddr,data);
+	sram_i2c_get_ipd_event(I2C_MBTFIPD);
+	
+	sram_i2c_send_stop();
+	sram_i2c_get_ipd_event(I2C_STOPIPD);
+	sram_i2c_clean_stop();
+	sram_i2c_disenable();
+	return 0;
+	
+}
+
+uint8 __sramfunc sram_i2c_read(uint8 I2CSlaveAddr, uint8 regAddr)
+{
+  	unsigned int data;
+	sram_i2c_read_enable();
+	sram_i2c_get_ipd_event(I2C_STARTIPD);
+	sram_i2c_clean_start();
+
+	sram_i2c_read_prepare(I2CSlaveAddr,regAddr);
+	sram_i2c_get_ipd_event(I2C_MBRFIPD);
+	
+	data = sram_i2c_read_get_data(I2CSlaveAddr,regAddr);
+	
+ 	sram_i2c_send_stop();
+	sram_i2c_get_ipd_event(I2C_STOPIPD);
+	sram_i2c_clean_stop();
+	sram_i2c_disenable();
+	return data;
+}
+
+void __sramfunc rk30_suspend_voltage_set(unsigned int vol)
+{
+    uint8 slaveaddr;
+    uint16 slavereg;
+    uint8 data,ret = 0;
+	uint8 rtc_status_reg = 0x11;
+	slaveaddr = I2C_SADDR;            //slave device addr
+    slavereg = 0x22;            // reg addr
+    data = 0x23;       //set arm 1.0v
+    
+    sram_i2c_init();  //init i2c device
+    ret = sram_i2c_read(slaveaddr, rtc_status_reg);
+	sram_i2c_write(slaveaddr, rtc_status_reg, ret);
+    arm_voltage = sram_i2c_read(slaveaddr, slavereg);
+//	sram_printhex(ret);
+    sram_i2c_write(slaveaddr, slavereg, data);//	
+    sram_i2c_deinit();  //deinit i2c device
+
+}
+
+void __sramfunc rk30_suspend_voltage_resume(unsigned int vol)
+{
+    uint8 slaveaddr;
+    uint16 slavereg;
+    uint8 data,ret = 0;
+	slaveaddr = I2C_SADDR;            //slave device addr
+    slavereg = 0x22;            // reg addr  
+   	
+    sram_i2c_init();  //init i2c device
+	if (arm_voltage >= 0x3b ){   // set arm <= 1.3v
+		data = 0x3b;
+	}
+	else if(arm_voltage <= 0x1f){
+		data = 0x1f;			 // set arm >= 0.95v
+	}
+	else
+		data = arm_voltage;
+    sram_i2c_write(slaveaddr, slavereg, data);
+    sram_i2c_deinit();  //deinit i2c device
+}
+#else
+void __sramfunc rk30_suspend_voltage_set(unsigned int vol)
+{
+
+}
+void __sramfunc rk30_suspend_voltage_resume(unsigned int vol)
+{
+   
+}
+#endif
+
+
+
-- 
2.34.1