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rk2928:a720:support i2c_sram
This commit is contained in:
张晴
364
arch/arm/mach-rk2928/i2c_sram.c
Executable file
364
arch/arm/mach-rk2928/i2c_sram.c
Executable file
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#include <linux/io.h>
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#include <mach/board.h>
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#include <mach/sram.h>
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#include <mach/iomux.h>
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#include <mach/cru.h>
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#include <asm/io.h>
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#include <mach/gpio.h>
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#define cru_readl(offset) readl_relaxed(RK2928_CRU_BASE + offset)
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#define cru_writel(v, offset) do { writel_relaxed(v, RK2928_CRU_BASE + offset); dsb(); } while (0)
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#if defined(CONFIG_RK30_I2C_INSRAM)
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/******************need set when you use i2c*************************/
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#define I2C_SPEED 100
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#define I2C_SADDR (0x2D) /* slave address ,wm8310 addr is 0x34*/
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#define SRAM_I2C_CH 1 //CH==0, i2c0,CH==1, i2c1,CH==2, i2c2,CH==3, i2c3
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#if defined (CONFIG_MACH_RK2928_SDK)
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#define SRAM_I2C_ADDRBASE (RK2928_RKI2C1_BASE )//RK29_I2C0_BASE\RK29_I2C2_BASE\RK29_I2C3_BASE
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#else
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#define SRAM_I2C_ADDRBASE (RK2928_RKI2C0_BASE )
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#endif
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#define I2C_SLAVE_ADDR_LEN 1 // 2:slav addr is 10bit ,1:slav addr is 7bit
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#define I2C_SLAVE_REG_LEN 1 // 2:slav reg addr is 16 bit ,1:is 8 bit
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#define SRAM_I2C_DATA_BYTE 1 //i2c transmission data is 1bit(8wei) or 2bit(16wei)
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#define GRF_GPIO_IOMUX 0xd4 //GRF_GPIO2D_IOMUX
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/*ch=0:GRF_GPIO2L_IOMUX,ch=1:GRF_GPIO1L_IOMUX,ch=2:GRF_GPIO5H_IOMUX,ch=3:GRF_GPIO2L_IOMUX*/
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#define I2C_GRF_GPIO_IOMUX (0x01<<14)|(0x01<<12)
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/*CH=0:(~(0x03<<30))&(~(0x03<<28))|(0x01<<30)|(0x01<<28),CH=1:(~(0x03<<14))&(~(0x03<<12))|(0x01<<14)|(0x01<<12),
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CH=2:(~(0x03<<24))&(~(0x03<<22))|(0x01<<24)|(0x01<<22),CH=3:(~(0x03<<26))&(~(0x03<<24))|(0x02<<26)|(0x02<<24)*/
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/***************************************/
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#define I2C_SLAVE_TYPE (((I2C_SLAVE_ADDR_LEN-1)<<4)|((I2C_SLAVE_REG_LEN-1)))
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#define uint8 unsigned char
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#define uint16 unsigned short
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#define uint32 unsigned int
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uint32 __sramdata data[5];
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uint8 __sramdata arm_voltage = 0;
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#define CRU_CLKGATE0_CON 0xd0
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#define CRU_CLKGATE8_CON 0xf0
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#define CRU_CLKSEL1_CON 0x48
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#define GRF_GPIO5H_IOMUX 0x74
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#define GRF_GPIO2L_IOMUX 0x58
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#define GRF_GPIO1L_IOMUX 0x50
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#define COMPLETE_READ (1<<STATE_START|1<<STATE_READ|1<<STATE_STOP)
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#define COMPLETE_WRITE (1<<STATE_START|1<<STATE_WRITE|1<<STATE_STOP)
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/* Control register */
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#define I2C_CON 0x0000
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#define I2C_CON_EN (1 << 0)
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#define I2C_CON_MOD(mod) ((mod) << 1)
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#define I2C_CON_MASK (3 << 1)
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enum{
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I2C_CON_MOD_TX = 0,
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I2C_CON_MOD_TRX,
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I2C_CON_MOD_RX,
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I2C_CON_MOD_RRX,
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};
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#define I2C_CON_START (1 << 3)
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#define I2C_CON_STOP (1 << 4)
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#define I2C_CON_LASTACK (1 << 5)
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#define I2C_CON_ACTACK (1 << 6)
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/* Clock dividor register */
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#define I2C_CLKDIV 0x0004
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#define I2C_CLKDIV_VAL(divl, divh) (((divl) & 0xffff) | (((divh) << 16) & 0xffff0000))
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#define rk30_ceil(x, y) \
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({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
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/* the slave address accessed for master rx mode */
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#define I2C_MRXADDR 0x0008
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#define I2C_MRXADDR_LOW (1 << 24)
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#define I2C_MRXADDR_MID (1 << 25)
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#define I2C_MRXADDR_HIGH (1 << 26)
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/* the slave register address accessed for master rx mode */
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#define I2C_MRXRADDR 0x000c
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#define I2C_MRXRADDR_LOW (1 << 24)
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#define I2C_MRXRADDR_MID (1 << 25)
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#define I2C_MRXRADDR_HIGH (1 << 26)
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/* master tx count */
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#define I2C_MTXCNT 0x0010
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/* master rx count */
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#define I2C_MRXCNT 0x0014
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/* interrupt enable register */
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#define I2C_IEN 0x0018
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#define I2C_BTFIEN (1 << 0)
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#define I2C_BRFIEN (1 << 1)
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#define I2C_MBTFIEN (1 << 2)
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#define I2C_MBRFIEN (1 << 3)
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#define I2C_STARTIEN (1 << 4)
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#define I2C_STOPIEN (1 << 5)
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#define I2C_NAKRCVIEN (1 << 6)
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#define IRQ_MST_ENABLE (I2C_MBTFIEN | I2C_MBRFIEN | I2C_NAKRCVIEN | I2C_STARTIEN | I2C_STOPIEN)
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#define IRQ_ALL_DISABLE 0
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/* interrupt pending register */
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#define I2C_IPD 0x001c
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#define I2C_BTFIPD (1 << 0)
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#define I2C_BRFIPD (1 << 1)
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#define I2C_MBTFIPD (1 << 2)
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#define I2C_MBRFIPD (1 << 3)
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#define I2C_STARTIPD (1 << 4)
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#define I2C_STOPIPD (1 << 5)
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#define I2C_NAKRCVIPD (1 << 6)
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#define I2C_IPD_ALL_CLEAN 0x7f
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/* finished count */
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#define I2C_FCNT 0x0020
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/* I2C tx data register */
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#define I2C_TXDATA_BASE 0X0100
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/* I2C rx data register */
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#define I2C_RXDATA_BASE 0x0200
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void __sramfunc sram_i2c_enable(void);
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void __sramfunc sram_i2c_disenable(void);
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void __sramfunc sram_printch(char byte);
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void __sramfunc sram_printhex(unsigned int hex);
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#define sram_udelay(usecs) SRAM_LOOP((usecs)*SRAM_LOOPS_PER_USEC)
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/*-------------------------------------------------------------------------------------------------------
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Name : sram_i2c_init
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Desc : initialize the necessary registers
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Params : channel-determine which I2C bus we used
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Return : none
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------------------------------------------------------------------------------------------------------*/
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void __sramfunc sram_i2c_init()
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{
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unsigned int div, divl, divh;
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//enable cru_clkgate8 clock
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data[1] = cru_readl(CLK_GATE_CLKID_CONS(CLK_GATE_CLKID(8)));
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#if defined (CONFIG_MACH_RK2928_SDK)
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cru_writel(CLK_GATE_W_MSK(CLK_GATE_PCLK_I2C1)|CLK_UN_GATE(CLK_GATE_PCLK_I2C1),
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CLK_GATE_CLKID_CONS(CLK_GATE_PCLK_I2C1));
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#else
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cru_writel(CLK_GATE_W_MSK(CLK_GATE_PCLK_I2C0)|CLK_UN_GATE(CLK_GATE_PCLK_I2C0),
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CLK_GATE_CLKID_CONS(CLK_GATE_PCLK_I2C0));
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#endif
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data[2] = readl_relaxed(RK2928_GRF_BASE + GRF_GPIO_IOMUX);
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writel_relaxed(data[2]| I2C_GRF_GPIO_IOMUX, RK2928_GRF_BASE + GRF_GPIO_IOMUX);
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div = rk30_ceil(24*1000*1000, I2C_SPEED*1000 * 8);
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divh = divl = rk30_ceil(div, 2);
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writel_relaxed(I2C_CLKDIV_VAL(divl, divh), SRAM_I2C_ADDRBASE + I2C_CLKDIV);
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data[3] = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CLKDIV);
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}
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/*-------------------------------------------------------------------------------------------------------
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Name : sram_i2c_deinit
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Desc : de-initialize the necessary registers
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Params : noe
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Return : none
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------------------------------------------------------------------------------------------------------*/
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void __sramfunc sram_i2c_deinit(void)
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{
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//restore iomux reg
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writel_relaxed(data[2], RK2928_GRF_BASE + GRF_GPIO_IOMUX);
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//restore scu clock reg
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cru_writel(data[1], CLK_GATE_CLKID_CONS(CLK_GATE_PCLK_I2C1));
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}
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/*-------------------------------------------------------------------------------------------------------
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Name : sram_i2c_start
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Desc : start i2c
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Params : none
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Return : none
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------------------------------------------------------------------------------------------------------*/
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void __sramfunc sram_i2c_read_enable(void)
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{
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writel_relaxed(((((I2C_CON_EN | I2C_CON_MOD(1)) | I2C_CON_LASTACK) )| I2C_CON_START) & (~(I2C_CON_STOP)) , SRAM_I2C_ADDRBASE + I2C_CON);
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}
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void __sramfunc sram_i2c_write_enable(void)
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{
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writel_relaxed(((((I2C_CON_EN | I2C_CON_MOD(0)) | I2C_CON_LASTACK) )| I2C_CON_START) & (~(I2C_CON_STOP)) , SRAM_I2C_ADDRBASE + I2C_CON);
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}
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void __sramfunc sram_i2c_disenable(void)
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{
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writel_relaxed(0, SRAM_I2C_ADDRBASE + I2C_CON);
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}
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void __sramfunc sram_i2c_clean_start(void)
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{
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unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
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con = (con & (~I2C_CON_START)) ;
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writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
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}
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void __sramfunc sram_i2c_send_start(void)
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{
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unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
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con |= I2C_CON_START;
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if(con & I2C_CON_STOP)
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sram_printch('E');
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writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
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}
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void __sramfunc sram_i2c_send_stop(void)
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{
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unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
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con &= ~I2C_CON_START;
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con |= I2C_CON_STOP;
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if(con & I2C_CON_START)
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sram_printch('E');
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writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
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}
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void __sramfunc sram_i2c_clean_stop(void)
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{
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unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_CON);
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con = (con & (~I2C_CON_STOP)) ;
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writel_relaxed(con, SRAM_I2C_ADDRBASE + I2C_CON);
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}
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void __sramfunc sram_i2c_get_ipd_event(int type)
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{
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int time = 2000;
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unsigned int con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_IPD);
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writel_relaxed(type, SRAM_I2C_ADDRBASE + I2C_IEN);
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do{
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sram_udelay(10);
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con = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_IPD);
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}while(((--time) & (~(con & type))));
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writel_relaxed(type,SRAM_I2C_ADDRBASE + I2C_IPD);
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if(time <= 0){
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sram_printch('T');
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}
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}
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void __sramfunc sram_i2c_write_prepare(uint8 I2CSlaveAddr, uint8 regAddr,uint8 pdata)
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{
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u32 data = 0;
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unsigned int addr = (I2CSlaveAddr & 0x7f) << 1;
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data = (addr | (regAddr << 8))|(pdata << 16);
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writel_relaxed(data , SRAM_I2C_ADDRBASE + I2C_TXDATA_BASE);
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writel_relaxed(3, SRAM_I2C_ADDRBASE + I2C_MTXCNT);
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}
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uint8 __sramfunc sram_i2c_read_prepare(uint8 I2CSlaveAddr, uint8 regAddr)
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{
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unsigned int addr = (I2CSlaveAddr & 0x7f) << 1;
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writel_relaxed(addr | I2C_MRXADDR_LOW, SRAM_I2C_ADDRBASE + I2C_MRXADDR);
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writel_relaxed(regAddr | I2C_MRXADDR_LOW, SRAM_I2C_ADDRBASE + I2C_MRXRADDR);
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writel_relaxed(SRAM_I2C_DATA_BYTE, SRAM_I2C_ADDRBASE + I2C_MRXCNT);
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return 0;
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}
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uint8 __sramfunc sram_i2c_read_get_data(uint8 I2CSlaveAddr, uint8 regAddr)
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{
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unsigned int ret;
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ret = readl_relaxed(SRAM_I2C_ADDRBASE + I2C_RXDATA_BASE);
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ret = ret & 0x000000ff;
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return ret;
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}
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uint8 __sramfunc sram_i2c_write(uint8 I2CSlaveAddr, uint8 regAddr,uint8 data)
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{
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sram_i2c_write_enable();
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sram_i2c_get_ipd_event(I2C_STARTIPD);
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sram_i2c_clean_start();
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sram_i2c_write_prepare(I2CSlaveAddr,regAddr,data);
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sram_i2c_get_ipd_event(I2C_MBTFIPD);
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sram_i2c_send_stop();
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sram_i2c_get_ipd_event(I2C_STOPIPD);
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sram_i2c_clean_stop();
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sram_i2c_disenable();
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return 0;
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}
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uint8 __sramfunc sram_i2c_read(uint8 I2CSlaveAddr, uint8 regAddr)
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{
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unsigned int data;
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sram_i2c_read_enable();
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sram_i2c_get_ipd_event(I2C_STARTIPD);
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sram_i2c_clean_start();
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sram_i2c_read_prepare(I2CSlaveAddr,regAddr);
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sram_i2c_get_ipd_event(I2C_MBRFIPD);
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data = sram_i2c_read_get_data(I2CSlaveAddr,regAddr);
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sram_i2c_send_stop();
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sram_i2c_get_ipd_event(I2C_STOPIPD);
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sram_i2c_clean_stop();
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sram_i2c_disenable();
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return data;
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}
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void __sramfunc rk30_suspend_voltage_set(unsigned int vol)
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{
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uint8 slaveaddr;
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uint16 slavereg;
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uint8 data,ret = 0;
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uint8 rtc_status_reg = 0x11;
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slaveaddr = I2C_SADDR; //slave device addr
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slavereg = 0x22; // reg addr
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data = 0x23; //set arm 1.0v
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sram_i2c_init(); //init i2c device
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ret = sram_i2c_read(slaveaddr, rtc_status_reg);
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sram_i2c_write(slaveaddr, rtc_status_reg, ret);
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arm_voltage = sram_i2c_read(slaveaddr, slavereg);
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// sram_printhex(ret);
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sram_i2c_write(slaveaddr, slavereg, data);//
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sram_i2c_deinit(); //deinit i2c device
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}
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void __sramfunc rk30_suspend_voltage_resume(unsigned int vol)
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{
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uint8 slaveaddr;
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uint16 slavereg;
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uint8 data,ret = 0;
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slaveaddr = I2C_SADDR; //slave device addr
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slavereg = 0x22; // reg addr
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sram_i2c_init(); //init i2c device
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if (arm_voltage >= 0x3b ){ // set arm <= 1.3v
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data = 0x3b;
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}
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else if(arm_voltage <= 0x1f){
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data = 0x1f; // set arm >= 0.95v
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}
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else
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data = arm_voltage;
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sram_i2c_write(slaveaddr, slavereg, data);
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sram_i2c_deinit(); //deinit i2c device
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}
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#else
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void __sramfunc rk30_suspend_voltage_set(unsigned int vol)
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{
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}
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void __sramfunc rk30_suspend_voltage_resume(unsigned int vol)
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{
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}
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#endif
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