[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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