Merge branch 'for-rmk' of git://pasiphae.extern.pengutronix.de/git/imx/linux-2.6.git

[linux-2.6-omap-h63xx.git] / drivers / i2c / busses / i2c-pxa.c

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index d65b7fbb46942b058b83dd7d1c478241019da4c4..906f9b9d715d50af2c555424ae323effc74d05d9 100644 (file)
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -34,11 +34,48 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 
-#include <asm/arch/hardware.h>
+#include <mach/hardware.h>
 #include <asm/irq.h>
 #include <asm/io.h>
-#include <asm/arch/i2c.h>
-#include <asm/arch/pxa-regs.h>
+#include <mach/i2c.h>
+
+/*
+ * I2C registers and bit definitions
+ */
+#define IBMR           (0x00)
+#define IDBR           (0x08)
+#define ICR            (0x10)
+#define ISR            (0x18)
+#define ISAR           (0x20)
+
+#define ICR_START      (1 << 0)           /* start bit */
+#define ICR_STOP       (1 << 1)           /* stop bit */
+#define ICR_ACKNAK     (1 << 2)           /* send ACK(0) or NAK(1) */
+#define ICR_TB         (1 << 3)           /* transfer byte bit */
+#define ICR_MA         (1 << 4)           /* master abort */
+#define ICR_SCLE       (1 << 5)           /* master clock enable */
+#define ICR_IUE                (1 << 6)           /* unit enable */
+#define ICR_GCD                (1 << 7)           /* general call disable */
+#define ICR_ITEIE      (1 << 8)           /* enable tx interrupts */
+#define ICR_IRFIE      (1 << 9)           /* enable rx interrupts */
+#define ICR_BEIE       (1 << 10)          /* enable bus error ints */
+#define ICR_SSDIE      (1 << 11)          /* slave STOP detected int enable */
+#define ICR_ALDIE      (1 << 12)          /* enable arbitration interrupt */
+#define ICR_SADIE      (1 << 13)          /* slave address detected int enable */
+#define ICR_UR         (1 << 14)          /* unit reset */
+#define ICR_FM         (1 << 15)          /* fast mode */
+
+#define ISR_RWM                (1 << 0)           /* read/write mode */
+#define ISR_ACKNAK     (1 << 1)           /* ack/nak status */
+#define ISR_UB         (1 << 2)           /* unit busy */
+#define ISR_IBB                (1 << 3)           /* bus busy */
+#define ISR_SSD                (1 << 4)           /* slave stop detected */
+#define ISR_ALD                (1 << 5)           /* arbitration loss detected */
+#define ISR_ITE                (1 << 6)           /* tx buffer empty */
+#define ISR_IRF                (1 << 7)           /* rx buffer full */
+#define ISR_GCAD       (1 << 8)           /* general call address detected */
+#define ISR_SAD                (1 << 9)           /* slave address detected */
+#define ISR_BED                (1 << 10)          /* bus error no ACK/NAK */
 
 struct pxa_i2c {
        spinlock_t              lock;
@@ -60,19 +97,21 @@ struct pxa_i2c {
        u32                     icrlog[32];
 
        void __iomem            *reg_base;
+       unsigned int            reg_shift;
 
        unsigned long           iobase;
        unsigned long           iosize;
 
        int                     irq;
-       int                     use_pio;
+       unsigned int            use_pio :1;
+       unsigned int            fast_mode :1;
 };
 
-#define _IBMR(i2c)     ((i2c)->reg_base + 0)
-#define _IDBR(i2c)     ((i2c)->reg_base + 8)
-#define _ICR(i2c)      ((i2c)->reg_base + 0x10)
-#define _ISR(i2c)      ((i2c)->reg_base + 0x18)
-#define _ISAR(i2c)     ((i2c)->reg_base + 0x20)
+#define _IBMR(i2c)     ((i2c)->reg_base + (0x0 << (i2c)->reg_shift))
+#define _IDBR(i2c)     ((i2c)->reg_base + (0x4 << (i2c)->reg_shift))
+#define _ICR(i2c)      ((i2c)->reg_base + (0x8 << (i2c)->reg_shift))
+#define _ISR(i2c)      ((i2c)->reg_base + (0xc << (i2c)->reg_shift))
+#define _ISAR(i2c)     ((i2c)->reg_base + (0x10 << (i2c)->reg_shift))
 
 /*
  * I2C Slave mode address
@@ -188,14 +227,14 @@ static inline int i2c_pxa_is_slavemode(struct pxa_i2c *i2c)
 
 static void i2c_pxa_abort(struct pxa_i2c *i2c)
 {
-       unsigned long timeout = jiffies + HZ/4;
+       int i = 250;
 
        if (i2c_pxa_is_slavemode(i2c)) {
                dev_dbg(&i2c->adap.dev, "%s: called in slave mode\n", __func__);
                return;
        }
 
-       while (time_before(jiffies, timeout) && (readl(_IBMR(i2c)) & 0x1) == 0) {
+       while ((i > 0) && (readl(_IBMR(i2c)) & 0x1) == 0) {
                unsigned long icr = readl(_ICR(i2c));
 
                icr &= ~ICR_START;
@@ -205,7 +244,8 @@ static void i2c_pxa_abort(struct pxa_i2c *i2c)
 
                show_state(i2c);
 
-               msleep(1);
+               mdelay(1);
+               i --;
        }
 
        writel(readl(_ICR(i2c)) & ~(ICR_MA | ICR_START | ICR_STOP),
@@ -364,7 +404,7 @@ static void i2c_pxa_reset(struct pxa_i2c *i2c)
        writel(i2c->slave_addr, _ISAR(i2c));
 
        /* set control register values */
-       writel(I2C_ICR_INIT, _ICR(i2c));
+       writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
 
 #ifdef CONFIG_I2C_PXA_SLAVE
        dev_info(&i2c->adap.dev, "Enabling slave mode\n");
@@ -907,12 +947,6 @@ static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num
        struct pxa_i2c *i2c = adap->algo_data;
        int ret, i;
 
-       /* If the I2C controller is disabled we need to reset it (probably due
-          to a suspend/resume destroying state). We do this here as we can then
-          avoid worrying about resuming the controller before its users. */
-       if (!(readl(_ICR(i2c)) & ICR_IUE))
-               i2c_pxa_reset(i2c);
-
        for (i = adap->retries; i >= 0; i--) {
                ret = i2c_pxa_do_xfer(i2c, msgs, num);
                if (ret != I2C_RETRY)
@@ -993,6 +1027,7 @@ static int i2c_pxa_probe(struct platform_device *dev)
                ret = -EIO;
                goto eremap;
        }
+       i2c->reg_shift = (cpu_is_pxa3xx() && (dev->id == 1)) ? 0 : 1;
 
        i2c->iobase = res->start;
        i2c->iosize = res_len(res);
@@ -1013,6 +1048,7 @@ static int i2c_pxa_probe(struct platform_device *dev)
        if (plat) {
                i2c->adap.class = plat->class;
                i2c->use_pio = plat->use_pio;
+               i2c->fast_mode = plat->fast_mode;
        }
 
        if (i2c->use_pio) {
@@ -1082,9 +1118,33 @@ static int __exit i2c_pxa_remove(struct platform_device *dev)
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int i2c_pxa_suspend_late(struct platform_device *dev, pm_message_t state)
+{
+       struct pxa_i2c *i2c = platform_get_drvdata(dev);
+       clk_disable(i2c->clk);
+       return 0;
+}
+
+static int i2c_pxa_resume_early(struct platform_device *dev)
+{
+       struct pxa_i2c *i2c = platform_get_drvdata(dev);
+
+       clk_enable(i2c->clk);
+       i2c_pxa_reset(i2c);
+
+       return 0;
+}
+#else
+#define i2c_pxa_suspend_late NULL
+#define i2c_pxa_resume_early NULL
+#endif
+
 static struct platform_driver i2c_pxa_driver = {
        .probe          = i2c_pxa_probe,
        .remove         = __exit_p(i2c_pxa_remove),
+       .suspend_late   = i2c_pxa_suspend_late,
+       .resume_early   = i2c_pxa_resume_early,
        .driver         = {
                .name   = "pxa2xx-i2c",
                .owner  = THIS_MODULE,