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1 files changed, 387 insertions, 0 deletions

diff --git a/src/atii2c.c b/src/atii2c.c
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+/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/ati/atii2c.c,v 1.3 2003/11/10 18:41:20 tsi Exp $ */
+/*
+ * Copyright 2003 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of Marc Aurele La France not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  Marc Aurele La France makes no representations
+ * about the suitability of this software for any purpose.  It is provided
+ * "as-is" without express or implied warranty.
+ *
+ * MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO
+ * EVENT SHALL MARC AURELE LA FRANCE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "atiadapter.h"
+#include "atii2c.h"
+#include "atiload.h"
+#include "atimach64i2c.h"
+#include "atistruct.h"
+
+#include "xf86.h"
+
+/* This is derived from GATOS code, with a liberal sprinkling of bug fixes */
+
+/*
+ * Some local macros for use by the mid-level I2C functions.
+ */
+
+#define ATII2CDelay                                            \
+    (*pI2CBus->I2CUDelay)(pI2CBus, pI2CBus->HoldTime)
+
+
+#define ATII2CSCLDirOff                                        \
+    if (pATII2C->SCLDir != 0)                                  \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur & ~pATII2C->SCLDir)
+
+#define ATII2CSCLDirOn                                         \
+    if (pATII2C->SCLDir != 0)                                  \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur | pATII2C->SCLDir)
+
+#define ATII2CSDADirOff                                        \
+    if (pATII2C->SDADir != 0)                                  \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur & ~pATII2C->SDADir)
+
+#define ATII2CSDADirOn                                         \
+    if (pATII2C->SDADir != 0)                                  \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur | pATII2C->SDADir)
+
+
+#define ATII2CSCLBitGet                                        \
+    ((*pATII2C->I2CGetBits)(pATI) & pATII2C->SCLGet)
+
+#define ATII2CSCLBitOff                                        \
+    do                                                         \
+    {                                                          \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur & ~pATII2C->SCLSet);               \
+        ATII2CDelay;                                           \
+    } while (0)
+
+#define ATII2CSCLBitOn                                         \
+    do                                                         \
+    {                                                          \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur | pATII2C->SCLSet);                \
+        do      /* Wait until all devices have released SCL */ \
+        {                                                      \
+            ATII2CDelay;                                       \
+        } while (ATII2CSCLBitGet == 0);                        \
+    } while (0)
+
+
+#define ATII2CSDABitGet                                        \
+    ((*pATII2C->I2CGetBits)(pATI) & pATII2C->SDAGet)
+
+#define ATII2CSDABitOff                                        \
+    do                                                         \
+    {                                                          \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur & ~pATII2C->SDASet);               \
+        ATII2CDelay;                                           \
+    } while (0)
+
+#define ATII2CSDABitOn                                         \
+    do                                                         \
+    {                                                          \
+        (*pATII2C->I2CSetBits)(pATII2C, pATI,                  \
+            pATII2C->I2CCur | pATII2C->SDASet);                \
+        ATII2CDelay;                                           \
+    } while (0)
+
+#define ATII2CSDABitSet(_flag)                                 \
+    do                                                         \
+    {                                                          \
+        if (_flag)                                             \
+            ATII2CSDABitOn;                                    \
+        else                                                   \
+            ATII2CSDABitOff;                                   \
+    } while (0)
+
+
+/*
+ * ATII2CAddress --
+ *
+ * This function puts a Start bit and an 8-bit address on the I2C bus.
+ */
+static Bool
+ATII2CAddress
+(
+    I2CDevPtr    pI2CDev,
+    I2CSlaveAddr Address
+)
+{
+    I2CBusPtr pI2CBus = pI2CDev->pI2CBus;
+    ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr;
+    ATIPtr    pATI    = pATII2C->pATI;
+
+    /*
+     * Set I2C line directions to out-bound.  SCL will remain out-bound until
+     * next I2C Stop.
+     */
+    ATII2CSCLDirOn;
+    ATII2CSDADirOn;
+
+    /*
+     * Send Start bit.  This is a pull-down of the data line while the clock
+     * line is pulled up.
+     */
+    ATII2CSDABitOn;
+    ATII2CSCLBitOn;
+    ATII2CSDABitOff;
+    ATII2CSCLBitOff;
+
+    /* Send low byte of device address */
+    if ((*pI2CBus->I2CPutByte)(pI2CDev, (I2CByte)Address))
+    {
+        /* Send top byte of address, if appropriate */
+        if (((Address & 0x00F8U) != 0x00F0U) &&
+            ((Address & 0x00FEU) != 0x0000U))
+            return TRUE;
+
+        if ((*pI2CBus->I2CPutByte)(pI2CDev, (I2CByte)(Address >> 8)))
+            return TRUE;
+    }
+
+    /* Kill I2C transaction on failure */
+    (*pI2CBus->I2CStop)(pI2CDev);
+    return FALSE;
+}
+
+/*
+ * ATII2CStop --
+ *
+ * This function puts a stop signal on the I2C bus.
+ */
+static void
+ATII2CStop
+(
+    I2CDevPtr pI2CDev
+)
+{
+    I2CBusPtr pI2CBus = pI2CDev->pI2CBus;
+    ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr;
+    ATIPtr    pATI    = pATII2C->pATI;
+
+    ATII2CSDADirOn;             /* Set data line direction to out-bound */
+
+    /*
+     * Send Stop bit.  This is a pull-up of the data line while the clock line
+     * is pulled up.
+     */
+    ATII2CSDABitOff;
+    ATII2CSCLBitOn;
+    ATII2CSDABitOn;
+    ATII2CSCLBitOff;
+
+    /* Reset I2C line directions to in-bound */
+    ATII2CSCLDirOff;
+    ATII2CSDADirOff;
+}
+
+/*
+ * ATII2CPutByte --
+ *
+ * This function puts an 8-bit value on the I2C bus, starting with its MSB.
+ */
+static Bool
+ATII2CPutByte
+(
+    I2CDevPtr pI2CDev,
+    I2CByte   Data
+)
+{
+    I2CBusPtr pI2CBus = pI2CDev->pI2CBus;
+    ATII2CPtr pATII2C = pI2CBus->DriverPrivate.ptr;
+    ATIPtr    pATI    = pATII2C->pATI;
+    int       i;
+    Bool      Result;
+
+    ATII2CSDADirOn;             /* Set data line direction to out-bound */
+
+    /* Send data byte */
+    for (i = 0;  i < 8;  i++)
+    {
+        ATII2CSDABitSet(Data & 0x80U);
+        ATII2CSCLBitOn;
+        ATII2CSCLBitOff;
+
+        Data <<= 1;
+    }
+
+    ATII2CSDABitOn;             /* Release data line */
+
+    ATII2CSDADirOff;            /* Set data line direction to in-bound */
+
+    ATII2CSCLBitOn;             /* Start bit-read clock pulse */
+
+    /* Get [N]ACK bit */
+    if (ATII2CSDABitGet)
+        Result = FALSE;
+    else
+        Result = TRUE;
+
+    ATII2CSCLBitOff;            /* End clock pulse */
+
+    return Result;
+}
+
+/*
+ * ATII2CGetByte --
+ *
+ * This function retrieves an 8-bit value from the I2C bus.
+ */
+static Bool
+ATII2CGetByte
+(
+    I2CDevPtr pI2CDev,
+    I2CByte   *pData,
+    Bool      Last
+)
+{
+    I2CBusPtr     pI2CBus = pI2CDev->pI2CBus;
+    ATII2CPtr     pATII2C = pI2CBus->DriverPrivate.ptr;
+    ATIPtr        pATI    = pATII2C->pATI;
+    unsigned long Value   = 1;
+
+    do
+    {
+        ATII2CSCLBitOn;         /* Start bit-read clock pulse */
+
+        /* Accumulate bit into byte value */
+        Value <<= 1;
+        if (ATII2CSDABitGet)
+            Value++;
+
+        ATII2CSCLBitOff;        /* End clock pulse */
+    } while (Value <= (unsigned long)((I2CByte)(-1)));
+
+    *pData = (I2CByte)Value;
+
+    ATII2CSDADirOn;             /* Set data line direction to out-bound */
+
+    /* Send [N]ACK bit */
+    ATII2CSDABitSet(Last);
+    ATII2CSCLBitOn;
+    ATII2CSCLBitOff;
+
+    if (!Last)
+        ATII2CSDABitOn;         /* Release data line */
+
+    ATII2CSDADirOff;            /* Set data line direction to in-bound */
+
+    return TRUE;
+}
+
+/*
+ * ATICreateI2CBusRec --
+ *
+ * This function is called to initialise an I2CBusRec.
+ */
+I2CBusPtr
+ATICreateI2CBusRec
+(
+    int    iScreen,
+    ATIPtr pATI,
+    char   *BusName
+)
+{
+    I2CBusPtr pI2CBus;
+    ATII2CPtr pATII2C = xnfcalloc(1, SizeOf(ATII2CRec));
+
+    if (!(pI2CBus = xf86CreateI2CBusRec()))
+    {
+        xf86DrvMsg(iScreen, X_WARNING, "Unable to allocate I2C Bus record.\n");
+        xfree(pATII2C);
+        return NULL;
+    }
+
+    /* Fill in generic structure fields */
+    pI2CBus->BusName           = BusName;
+    pI2CBus->scrnIndex         = iScreen;
+
+    pI2CBus->I2CAddress        = ATII2CAddress;
+    pI2CBus->I2CStop           = ATII2CStop;
+    pI2CBus->I2CPutByte        = ATII2CPutByte;
+    pI2CBus->I2CGetByte        = ATII2CGetByte;
+
+    pI2CBus->DriverPrivate.ptr = pATII2C;
+
+    pATII2C->pATI              = pATI;
+
+    if (xf86I2CBusInit(pI2CBus))
+        return pI2CBus;
+
+    xf86DrvMsg(iScreen, X_WARNING,
+        "I2C bus %s initialisation failure.\n", BusName);
+    xf86DestroyI2CBusRec(pI2CBus, TRUE, TRUE);
+    xfree(pATII2C);
+    return NULL;
+}
+
+/*
+ * ATII2CPreInit --
+ *
+ * This is called by ATIPreInit() to create I2C bus record(s) for the adapter.
+ */
+void
+ATII2CPreInit
+(
+    ScrnInfoPtr pScreenInfo,
+    ATIPtr      pATI
+)
+{
+    switch (pATI->Adapter)
+    {
+        case ATI_ADAPTER_MACH64:
+            if (!ATILoadModule(pScreenInfo, "i2c", ATIi2cSymbols))
+                return;
+
+            ATIMach64I2CPreInit(pScreenInfo, pATI);
+            break;
+
+        default:
+            break;
+    }
+}
+
+/*
+ * ATII2CFreeScreen --
+ *
+ * This is called by ATIFreeScreen() to remove the driver's I2C interface.
+ */
+void
+ATII2CFreeScreen
+(
+    int iScreen
+)
+{
+    I2CBusPtr pI2CBus, *ppI2CBus;
+    ATII2CPtr pATII2C;
+    int nI2CBus;
+
+    nI2CBus = xf86I2CGetScreenBuses(iScreen, &ppI2CBus);
+    while (--nI2CBus >= 0)
+    {
+        pI2CBus = ppI2CBus[nI2CBus];
+        pATII2C = pI2CBus->DriverPrivate.ptr;
+
+        xf86DestroyI2CBusRec(pI2CBus, TRUE, TRUE);
+        xfree(pATII2C);
+    }
+
+    xfree(ppI2CBus);
+}