[U-Boot] [PATCH 2/8] pxa_i2c: use structure to replace the direclty define

Lei Wen leiwen at marvell.com
Mon Mar 14 11:16:12 CET 2011


Signed-off-by: Lei Wen <leiwen at marvell.com>
---
 arch/arm/cpu/pxa/cpu.c                   |   11 +++
 arch/arm/include/asm/arch-pxa/pxa-regs.h |   56 ------------
 board/innokom/innokom.c                  |    9 +--
 drivers/i2c/pxa_i2c.c                    |  139 +++++++++++++++++++++---------
 include/configs/innokom.h                |    1 +
 include/configs/xm250.h                  |    1 +
 6 files changed, 111 insertions(+), 106 deletions(-)

diff --git a/arch/arm/cpu/pxa/cpu.c b/arch/arm/cpu/pxa/cpu.c
index 7d49cbb..24b59e7 100644
--- a/arch/arm/cpu/pxa/cpu.c
+++ b/arch/arm/cpu/pxa/cpu.c
@@ -318,3 +318,14 @@ int arch_cpu_init(void)
 	pxa_clock_setup();
 	return 0;
 }
+
+void i2c_clk_enable(void)
+{
+#ifdef CONFIG_CPU_MONAHANS
+	/* | CKENB_1_PWM1 | CKENB_0_PWM0); */
+	writel(readl(CKENB) | (CKENB_4_I2C), CKENB);
+#else /* CONFIG_CPU_MONAHANS */
+	/* set the global I2C clock on */
+	writel(readl(CKEN) | CKEN14_I2C, CKEN);
+#endif
+}
diff --git a/arch/arm/include/asm/arch-pxa/pxa-regs.h b/arch/arm/include/asm/arch-pxa/pxa-regs.h
index 65a387f..109fdc0 100644
--- a/arch/arm/include/asm/arch-pxa/pxa-regs.h
+++ b/arch/arm/include/asm/arch-pxa/pxa-regs.h
@@ -456,62 +456,6 @@ typedef void		(*ExcpHndlr) (void) ;
 		IrSR_XMITIR_IR_MODE)
 
 /*
- * I2C registers
- */
-#define IBMR		0x40301680  /* I2C Bus Monitor Register - IBMR */
-#define IDBR		0x40301688  /* I2C Data Buffer Register - IDBR */
-#define ICR		0x40301690  /* I2C Control Register - ICR */
-#define ISR		0x40301698  /* I2C Status Register - ISR */
-#define ISAR		0x403016A0  /* I2C Slave Address Register - ISAR */
-
-#ifdef CONFIG_CPU_MONAHANS
-#define PWRIBMR		0x40f500C0  /* Power I2C Bus Monitor Register-IBMR */
-#define PWRIDBR		0x40f500C4  /* Power I2C Data Buffer Register-IDBR */
-#define PWRICR		0x40f500C8  /* Power I2C Control Register - ICR */
-#define PWRISR		0x40f500CC  /* Power I2C Status Register - ISR */
-#define PWRISAR		0x40f500D0  /* Power I2C Slave Address Register-ISAR */
-#else
-#define PWRIBMR		0x40f00180  /* Power I2C Bus Monitor Register-IBMR */
-#define PWRIDBR		0x40f00188  /* Power I2C Data Buffer Register-IDBR */
-#define PWRICR		0x40f00190  /* Power I2C Control Register - ICR */
-#define PWRISR		0x40f00198  /* Power I2C Status Register - ISR */
-#define PWRISAR		0x40f001A0  /* Power I2C Slave Address Register-ISAR */
-#endif
-
-/* ----- Control register bits ---------------------------------------- */
-
-#define ICR_START	0x1		/* start bit */
-#define ICR_STOP	0x2		/* stop bit */
-#define ICR_ACKNAK	0x4		/* send ACK(0) or NAK(1) */
-#define ICR_TB		0x8		/* transfer byte bit */
-#define ICR_MA		0x10		/* master abort */
-#define ICR_SCLE	0x20		/* master clock enable, mona SCLEA */
-#define ICR_IUE		0x40		/* unit enable */
-#define ICR_GCD		0x80		/* general call disable */
-#define ICR_ITEIE	0x100		/* enable tx interrupts */
-#define ICR_IRFIE	0x200		/* enable rx interrupts, mona: DRFIE */
-#define ICR_BEIE	0x400		/* enable bus error ints */
-#define ICR_SSDIE	0x800		/* slave STOP detected int enable */
-#define ICR_ALDIE	0x1000		/* enable arbitration interrupt */
-#define ICR_SADIE	0x2000		/* slave address detected int enable */
-#define ICR_UR		0x4000		/* unit reset */
-#define ICR_FM		0x8000		/* Fast Mode */
-
-/* ----- Status register bits ----------------------------------------- */
-
-#define ISR_RWM		0x1		/* read/write mode */
-#define ISR_ACKNAK	0x2		/* ack/nak status */
-#define ISR_UB		0x4		/* unit busy */
-#define ISR_IBB		0x8		/* bus busy */
-#define ISR_SSD		0x10		/* slave stop detected */
-#define ISR_ALD		0x20		/* arbitration loss detected */
-#define ISR_ITE		0x40		/* tx buffer empty */
-#define ISR_IRF		0x80		/* rx buffer full */
-#define ISR_GCAD	0x100		/* general call address detected */
-#define ISR_SAD		0x200		/* slave address detected */
-#define ISR_BED		0x400		/* bus error no ACK/NAK */
-
-/*
  * Serial Audio Controller
  */
 /* FIXME the audio defines collide w/ the SA1111 defines.  I don't like these
diff --git a/board/innokom/innokom.c b/board/innokom/innokom.c
index e658c35..22de7e3 100644
--- a/board/innokom/innokom.c
+++ b/board/innokom/innokom.c
@@ -45,12 +45,7 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 int i2c_init_board(void)
 {
-	int i, icr;
-
-	/* disable I2C controller first, otherwhise it thinks we want to    */
-	/* talk to the slave port...                                        */
-	icr = readl(ICR);
-	writel(readl(ICR) & ~(ICR_SCLE | ICR_IUE), ICR);
+	int i;
 
 	/* set gpio pin low _before_ we change direction to output          */
 	writel(GPIO_bit(70), GPCR(70));
@@ -63,8 +58,6 @@ int i2c_init_board(void)
 		udelay(10);
 	}
 
-	writel(icr, ICR);
-
 	return 0;
 }
 
diff --git a/drivers/i2c/pxa_i2c.c b/drivers/i2c/pxa_i2c.c
index 7aa49ae..0e37417 100644
--- a/drivers/i2c/pxa_i2c.c
+++ b/drivers/i2c/pxa_i2c.c
@@ -8,6 +8,9 @@
  * (C) Copyright 2003 Pengutronix e.K.
  * Robert Schwebel <r.schwebel at pengutronix.de>
  *
+ * (C) Copyright 2011 Marvell Inc.
+ * Lei Wen <leiwen at marvell.com>
+ *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
@@ -30,8 +33,6 @@
  * Murray.Jensen at cmst.csiro.au, 27-Jan-01.
  */
 
-/* FIXME: this file is PXA255 specific! What about other XScales? */
-
 #include <common.h>
 #include <asm/io.h>
 
@@ -42,9 +43,41 @@
  *	- I2C_PXA_SLAVE_ADDR
  */
 
-#include <asm/arch/hardware.h>
-#include <asm/arch/pxa-regs.h>
 #include <i2c.h>
+extern void i2c_clk_enable(void);
+
+/* ----- Control register bits ---------------------------------------- */
+
+#define ICR_START	0x1		/* start bit */
+#define ICR_STOP	0x2		/* stop bit */
+#define ICR_ACKNAK	0x4		/* send ACK(0) or NAK(1) */
+#define ICR_TB		0x8		/* transfer byte bit */
+#define ICR_MA		0x10		/* master abort */
+#define ICR_SCLE	0x20		/* master clock enable, mona SCLEA */
+#define ICR_IUE		0x40		/* unit enable */
+#define ICR_GCD		0x80		/* general call disable */
+#define ICR_ITEIE	0x100		/* enable tx interrupts */
+#define ICR_IRFIE	0x200		/* enable rx interrupts, mona: DRFIE */
+#define ICR_BEIE	0x400		/* enable bus error ints */
+#define ICR_SSDIE	0x800		/* slave STOP detected int enable */
+#define ICR_ALDIE	0x1000		/* enable arbitration interrupt */
+#define ICR_SADIE	0x2000		/* slave address detected int enable */
+#define ICR_UR		0x4000		/* unit reset */
+#define ICR_FM		0x8000		/* Fast Mode */
+
+/* ----- Status register bits ----------------------------------------- */
+
+#define ISR_RWM		0x1		/* read/write mode */
+#define ISR_ACKNAK	0x2		/* ack/nak status */
+#define ISR_UB		0x4		/* unit busy */
+#define ISR_IBB		0x8		/* bus busy */
+#define ISR_SSD		0x10		/* slave stop detected */
+#define ISR_ALD		0x20		/* arbitration loss detected */
+#define ISR_ITE		0x40		/* tx buffer empty */
+#define ISR_IRF		0x80		/* rx buffer full */
+#define ISR_GCAD	0x100		/* general call address detected */
+#define ISR_SAD		0x200		/* slave address detected */
+#define ISR_BED		0x400		/* bus error no ACK/NAK */
 
 /*#define	DEBUG_I2C	1	/###* activate local debugging output  */
 #define I2C_PXA_SLAVE_ADDR	0x1	/* slave pxa unit address           */
@@ -86,6 +119,21 @@ struct i2c_msg {
 	u8 data;
 };
 
+struct pxa_i2c {
+	u32 ibmr;
+	u32 pad0;
+	u32 idbr;
+	u32 pad1;
+	u32 icr;
+	u32 pad2;
+	u32 isr;
+	u32 pad3;
+	u32 isar;
+};
+
+static struct pxa_i2c *base = (struct pxa_i2c *)CONFIG_PXA_I2C_REG;
+#define PXAI2C_AND(reg, val)	writel(readl(reg) & val, reg)
+#define PXAI2C_OR(reg, val)	writel(readl(reg) | val, reg)
 
 /**
  * i2c_pxa_reset: - reset the host controller
@@ -94,21 +142,17 @@ struct i2c_msg {
 
 static void i2c_reset( void )
 {
-	writel(readl(ICR) & ~ICR_IUE, ICR);	/* disable unit */
-	writel(readl(ICR) | ICR_UR, ICR);	/* reset the unit */
+	PXAI2C_AND(&base->icr, ~ICR_IUE);	/* disable unit */
+	PXAI2C_OR(&base->icr, ICR_UR);	/* reset the unit */
 	udelay(100);
-	writel(readl(ICR) & ~ICR_IUE, ICR);	/* disable unit */
-#ifdef CONFIG_CPU_MONAHANS
-	/* | CKENB_1_PWM1 | CKENB_0_PWM0); */
-	writel(readl(CKENB) | (CKENB_4_I2C), CKENB);
-#else /* CONFIG_CPU_MONAHANS */
-	/* set the global I2C clock on */
-	writel(readl(CKEN) | CKEN14_I2C, CKEN);
-#endif
-	writel(I2C_PXA_SLAVE_ADDR, ISAR);	/* set our slave address */
-	writel(I2C_ICR_INIT, ICR);		/* set control reg values */
-	writel(I2C_ISR_INIT, ISR);		/* set clear interrupt bits */
-	writel(readl(ICR) | ICR_IUE, ICR);	/* enable unit */
+	PXAI2C_AND(&base->icr, ~ICR_IUE);	/* disable unit */
+
+	i2c_clk_enable();
+
+	writel(I2C_PXA_SLAVE_ADDR, &base->isar);/* set our slave address */
+	writel(I2C_ICR_INIT, &base->icr);	/* set control reg values */
+	writel(I2C_ISR_INIT, &base->isr);	/* set clear interrupt bits */
+	PXAI2C_OR(&base->icr, ICR_IUE);		/* enable unit */
 	udelay(100);
 }
 
@@ -121,12 +165,14 @@ static void i2c_reset( void )
  */
 static int i2c_isr_set_cleared( unsigned long set_mask, unsigned long cleared_mask )
 {
-	int timeout = 10000;
+	int timeout = 10000, isr;
 
-	while( ((ISR & set_mask)!=set_mask) || ((ISR & cleared_mask)!=0) ){
-		udelay( 10 );
+	do {
+		isr = readl(&base->isr);
+		udelay(10);
 		if( timeout-- < 0 ) return 0;
-	}
+	} while (((isr & set_mask)!=set_mask)
+		 || ((isr & cleared_mask)!=0));
 
 	return 1;
 }
@@ -162,26 +208,26 @@ int i2c_transfer(struct i2c_msg *msg)
 			goto transfer_error_bus_busy;
 
 		/* start transmission */
-		writel(readl(ICR) & ~ICR_START, ICR);
-		writel(readl(ICR) & ~ICR_STOP, ICR);
-		writel(msg->data, IDBR);
+		PXAI2C_AND(&base->icr, ~ICR_START);
+		PXAI2C_AND(&base->icr, ~ICR_STOP);
+		writel(msg->data, &base->idbr);
 		if (msg->condition == I2C_COND_START)
-			writel(readl(ICR) | ICR_START, ICR);
+			PXAI2C_OR(&base->icr, ICR_START);
 		if (msg->condition == I2C_COND_STOP)
-			writel(readl(ICR) | ICR_STOP, ICR);
+			PXAI2C_OR(&base->icr, ICR_STOP);
 		if (msg->acknack == I2C_ACKNAK_SENDNAK)
-			writel(readl(ICR) | ICR_ACKNAK, ICR);
+			PXAI2C_OR(&base->icr, ICR_ACKNAK);
 		if (msg->acknack == I2C_ACKNAK_SENDACK)
-			writel(readl(ICR) & ~ICR_ACKNAK, ICR);
-		writel(readl(ICR) & ~ICR_ALDIE, ICR);
-		writel(readl(ICR) | ICR_TB, ICR);
+			PXAI2C_AND(&base->icr, ~ICR_ACKNAK);
+		PXAI2C_AND(&base->icr, ~ICR_ALDIE);
+		PXAI2C_OR(&base->icr, ICR_TB);
 
 		/* transmit register empty? */
 		if (!i2c_isr_set_cleared(ISR_ITE,0))
 			goto transfer_error_transmit_timeout;
 
 		/* clear 'transmit empty' state */
-		writel(readl(ISR) | ISR_ITE, ISR);
+		PXAI2C_OR(&base->isr, ISR_ITE);
 
 		/* wait for ACK from slave */
 		if (msg->acknack == I2C_ACKNAK_WAITACK)
@@ -196,27 +242,27 @@ int i2c_transfer(struct i2c_msg *msg)
 			goto transfer_error_bus_busy;
 
 		/* start receive */
-		writel(readl(ICR) & ~ICR_START, ICR);
-		writel(readl(ICR) & ~ICR_STOP, ICR);
+		PXAI2C_AND(&base->icr, ~ICR_START);
+		PXAI2C_AND(&base->icr, ~ICR_STOP);
 		if (msg->condition == I2C_COND_START)
-			writel(readl(ICR) | ICR_START, ICR);
+			PXAI2C_OR(&base->icr, ICR_START);
 		if (msg->condition == I2C_COND_STOP)
-			writel(readl(ICR) | ICR_STOP, ICR);
+			PXAI2C_OR(&base->icr, ICR_STOP);
 		if (msg->acknack == I2C_ACKNAK_SENDNAK)
-			writel(readl(ICR) | ICR_ACKNAK, ICR);
+			PXAI2C_OR(&base->icr, ICR_ACKNAK);
 		if (msg->acknack == I2C_ACKNAK_SENDACK)
-			writel(readl(ICR) & ~ICR_ACKNAK, ICR);
-		writel(readl(ICR) & ~ICR_ALDIE, ICR);
-		writel(readl(ICR) | ICR_TB, ICR);
+			PXAI2C_AND(&base->icr, ~ICR_ACKNAK);
+		PXAI2C_AND(&base->icr, ~ICR_ALDIE);
+		PXAI2C_OR(&base->icr, ICR_TB);
 
 		/* receive register full? */
 		if (!i2c_isr_set_cleared(ISR_IRF,0))
 			goto transfer_error_receive_timeout;
 
-		msg->data = readl(IDBR);
+		msg->data = readl(&base->idbr);
 
 		/* clear 'receive empty' state */
-		writel(readl(ISR) | ISR_IRF, ISR);
+		PXAI2C_OR(&base->isr, ISR_IRF);
 
 		break;
 
@@ -266,10 +312,19 @@ i2c_transfer_finish:
 void i2c_init(int speed, int slaveaddr)
 {
 #ifdef CONFIG_SYS_I2C_INIT_BOARD
+	u32 icr;
 	/* call board specific i2c bus reset routine before accessing the   */
 	/* environment, which might be in a chip on that bus. For details   */
 	/* about this problem see doc/I2C_Edge_Conditions.                  */
+
+	/* disable I2C controller first, otherwhise it thinks we want to    */
+	/* talk to the slave port...                                        */
+	icr = readl(&base->icr);
+	PXAI2C_AND(&base->icr, ~(ICR_SCLE | ICR_IUE));
+
 	i2c_init_board();
+
+	writel(icr, &base->icr);
 #endif
 }
 
diff --git a/include/configs/innokom.h b/include/configs/innokom.h
index 57d633c..b459668 100644
--- a/include/configs/innokom.h
+++ b/include/configs/innokom.h
@@ -141,6 +141,7 @@
  * I2C bus
  */
 #define CONFIG_PXA_I2C			1
+#define CONFIG_PXA_I2C_REG		0x40301680
 #define CONFIG_HARD_I2C			1
 #define CONFIG_SYS_I2C_SPEED			50000
 #define CONFIG_SYS_I2C_SLAVE			0xfe
diff --git a/include/configs/xm250.h b/include/configs/xm250.h
index 7a7c539..8cdad23 100644
--- a/include/configs/xm250.h
+++ b/include/configs/xm250.h
@@ -62,6 +62,7 @@
  * I2C bus
  */
 #define CONFIG_PXA_I2C			1
+#define CONFIG_PXA_I2C_REG		0x40301680
 #define CONFIG_HARD_I2C			1
 #define CONFIG_SYS_I2C_SPEED			50000
 #define CONFIG_SYS_I2C_SLAVE			0xfe
-- 
1.7.0.4



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