tdfxfb: move I2C functionality into the tdfxfb

The I2C functionality provided by the i2c-voodoo3 driver is moved into the
tdfxfb (frame buffer driver for Voodoo3 cards).  This way there is no
conflict between the i2c driver and the fb driver.

The tdfxfb does not make use from the DDC functionality yet but provides
all the functionality of the i2c-voodoo3 driver.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 234 insertions, 1 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index ffe2f2796e29..7826bdce4bbe 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1550,6 +1550,7 @@ config FB_3DFX
         select FB_CFB_IMAGEBLIT
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
+        select FB_MODE_HELPERS
         help
           This driver supports graphics boards with the 3Dfx Banshee,
           Voodoo3 or VSA-100 (aka Voodoo4/5) chips. Say Y if you have
@@ -1565,6 +1566,14 @@ config FB_3DFX_ACCEL
         This will compile the 3Dfx Banshee/Voodoo3/VSA-100 frame buffer
         device driver with acceleration functions.
 
+config FB_3DFX_I2C
+        bool "Enable DDC/I2C support"
+        depends on FB_3DFX && EXPERIMENTAL
+        select FB_DDC
+        default y
+        help
+          Say Y here if you want DDC/I2C support for your 3dfx Voodoo3.
+
 config FB_VOODOO1
         tristate "3Dfx Voodoo Graphics (sst1) support"
         depends on FB && PCI
diff --git a/drivers/video/tdfxfb.c b/drivers/video/tdfxfb.c
index ee64771fbe3d..bc6f916c53be 100644
--- a/drivers/video/tdfxfb.c
+++ b/drivers/video/tdfxfb.c
@@ -10,6 +10,12 @@
  * Created      : Thu Sep 23 18:17:43 1999, hmallat
  * Last modified: Tue Nov  2 21:19:47 1999, hmallat
  *
+ * I2C part copied from the i2c-voodoo3.c driver by:
+ * Frodo Looijaard <frodol@dds.nl>,
+ * Philip Edelbrock <phil@netroedge.com>,
+ * Ralph Metzler <rjkm@thp.uni-koeln.de>, and
+ * Mark D. Studebaker <mdsxyz123@yahoo.com>
+ *
  * Lots of the information here comes from the Daryll Strauss' Banshee
  * patches to the XF86 server, and the rest comes from the 3dfx
  * Banshee specification. I'm very much indebted to Daryll for his
@@ -1167,6 +1173,190 @@ static struct fb_ops tdfxfb_ops = {
 #endif
 };
 
+#ifdef CONFIG_FB_3DFX_I2C
+/* The voo GPIO registers don't have individual masks for each bit
+   so we always have to read before writing. */
+
+static void tdfxfb_i2c_setscl(void *data, int val)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+        unsigned int r;
+
+        r = tdfx_inl(par, VIDSERPARPORT);
+        if (val)
+                r |= I2C_SCL_OUT;
+        else
+                r &= ~I2C_SCL_OUT;
+        tdfx_outl(par, VIDSERPARPORT, r);
+        tdfx_inl(par, VIDSERPARPORT);   /* flush posted write */
+}
+
+static void tdfxfb_i2c_setsda(void *data, int val)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+        unsigned int r;
+
+        r = tdfx_inl(par, VIDSERPARPORT);
+        if (val)
+                r |= I2C_SDA_OUT;
+        else
+                r &= ~I2C_SDA_OUT;
+        tdfx_outl(par, VIDSERPARPORT, r);
+        tdfx_inl(par, VIDSERPARPORT);   /* flush posted write */
+}
+
+/* The GPIO pins are open drain, so the pins always remain outputs.
+   We rely on the i2c-algo-bit routines to set the pins high before
+   reading the input from other chips. */
+
+static int tdfxfb_i2c_getscl(void *data)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+
+        return (0 != (tdfx_inl(par, VIDSERPARPORT) & I2C_SCL_IN));
+}
+
+static int tdfxfb_i2c_getsda(void *data)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+
+        return (0 != (tdfx_inl(par, VIDSERPARPORT) & I2C_SDA_IN));
+}
+
+static void tdfxfb_ddc_setscl(void *data, int val)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+        unsigned int r;
+
+        r = tdfx_inl(par, VIDSERPARPORT);
+        if (val)
+                r |= DDC_SCL_OUT;
+        else
+                r &= ~DDC_SCL_OUT;
+        tdfx_outl(par, VIDSERPARPORT, r);
+        tdfx_inl(par, VIDSERPARPORT);   /* flush posted write */
+}
+
+static void tdfxfb_ddc_setsda(void *data, int val)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+        unsigned int r;
+
+        r = tdfx_inl(par, VIDSERPARPORT);
+        if (val)
+                r |= DDC_SDA_OUT;
+        else
+                r &= ~DDC_SDA_OUT;
+        tdfx_outl(par, VIDSERPARPORT, r);
+        tdfx_inl(par, VIDSERPARPORT);   /* flush posted write */
+}
+
+static int tdfxfb_ddc_getscl(void *data)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+
+        return (0 != (tdfx_inl(par, VIDSERPARPORT) & DDC_SCL_IN));
+}
+
+static int tdfxfb_ddc_getsda(void *data)
+{
+        struct tdfxfb_i2c_chan  *chan = data;
+        struct tdfx_par         *par = chan->par;
+
+        return (0 != (tdfx_inl(par, VIDSERPARPORT) & DDC_SDA_IN));
+}
+
+static int __devinit tdfxfb_setup_ddc_bus(struct tdfxfb_i2c_chan *chan,
+                                          const char *name, struct device *dev)
+{
+        int rc;
+
+        strlcpy(chan->adapter.name, name, sizeof(chan->adapter.name));
+        chan->adapter.owner             = THIS_MODULE;
+        chan->adapter.class             = I2C_CLASS_DDC;
+        chan->adapter.algo_data         = &chan->algo;
+        chan->adapter.dev.parent        = dev;
+        chan->algo.setsda               = tdfxfb_ddc_setsda;
+        chan->algo.setscl               = tdfxfb_ddc_setscl;
+        chan->algo.getsda               = tdfxfb_ddc_getsda;
+        chan->algo.getscl               = tdfxfb_ddc_getscl;
+        chan->algo.udelay               = 10;
+        chan->algo.timeout              = msecs_to_jiffies(500);
+        chan->algo.data                 = chan;
+
+        i2c_set_adapdata(&chan->adapter, chan);
+
+        rc = i2c_bit_add_bus(&chan->adapter);
+        if (rc == 0)
+                DPRINTK("I2C bus %s registered.\n", name);
+        else
+                chan->par = NULL;
+
+        return rc;
+}
+
+static int __devinit tdfxfb_setup_i2c_bus(struct tdfxfb_i2c_chan *chan,
+                                          const char *name, struct device *dev)
+{
+        int rc;
+
+        strlcpy(chan->adapter.name, name, sizeof(chan->adapter.name));
+        chan->adapter.owner             = THIS_MODULE;
+        chan->adapter.class             = I2C_CLASS_TV_ANALOG;
+        chan->adapter.algo_data         = &chan->algo;
+        chan->adapter.dev.parent        = dev;
+        chan->algo.setsda               = tdfxfb_i2c_setsda;
+        chan->algo.setscl               = tdfxfb_i2c_setscl;
+        chan->algo.getsda               = tdfxfb_i2c_getsda;
+        chan->algo.getscl               = tdfxfb_i2c_getscl;
+        chan->algo.udelay               = 10;
+        chan->algo.timeout              = msecs_to_jiffies(500);
+        chan->algo.data                 = chan;
+
+        i2c_set_adapdata(&chan->adapter, chan);
+
+        rc = i2c_bit_add_bus(&chan->adapter);
+        if (rc == 0)
+                DPRINTK("I2C bus %s registered.\n", name);
+        else
+                chan->par = NULL;
+
+        return rc;
+}
+
+static void __devinit tdfxfb_create_i2c_busses(struct fb_info *info)
+{
+        struct tdfx_par *par = info->par;
+
+        tdfx_outl(par, VIDINFORMAT, 0x8160);
+        tdfx_outl(par, VIDSERPARPORT, 0xcffc0020);
+
+        par->chan[0].par = par;
+        par->chan[1].par = par;
+
+        tdfxfb_setup_ddc_bus(&par->chan[0], "Voodoo3-DDC", info->dev);
+        tdfxfb_setup_i2c_bus(&par->chan[1], "Voodoo3-I2C", info->dev);
+}
+
+static void tdfxfb_delete_i2c_busses(struct tdfx_par *par)
+{
+        if (par->chan[0].par)
+                i2c_del_adapter(&par->chan[0].adapter);
+        par->chan[0].par = NULL;
+
+        if (par->chan[1].par)
+                i2c_del_adapter(&par->chan[1].adapter);
+        par->chan[1].par = NULL;
+}
+#endif /* CONFIG_FB_3DFX_I2C */
+
 /**
  *      tdfxfb_probe - Device Initializiation
  *
@@ -1284,7 +1474,9 @@ static int __devinit tdfxfb_probe(struct pci_dev *pdev,
         if (hwcursor)
                 info->fix.smem_len = (info->fix.smem_len - 1024) &
                                         (PAGE_MASK << 1);
-
+#ifdef CONFIG_FB_3DFX_I2C
+        tdfxfb_create_i2c_busses(info);
+#endif
         if (!mode_option)
                 mode_option = "640x480@60";
 
@@ -1315,6 +1507,9 @@ static int __devinit tdfxfb_probe(struct pci_dev *pdev,
         return 0;
 
 out_err_iobase:
+#ifdef CONFIG_FB_3DFX_I2C
+        tdfxfb_delete_i2c_busses(default_par);
+#endif
         if (default_par->mtrr_handle >= 0)
                 mtrr_del(default_par->mtrr_handle, info->fix.smem_start,
                          info->fix.smem_len);
@@ -1379,6 +1574,9 @@ static void __devexit tdfxfb_remove(struct pci_dev *pdev)
         struct tdfx_par *par = info->par;
 
         unregister_framebuffer(info);
+#ifdef CONFIG_FB_3DFX_I2C
+        tdfxfb_delete_i2c_busses(par);
+#endif
         if (par->mtrr_handle >= 0)
                 mtrr_del(par->mtrr_handle, info->fix.smem_start,
                          info->fix.smem_len);
diff --git a/include/video/tdfx.h b/include/video/tdfx.h
index 7431d9681e57..befbaf0a92d8 100644
--- a/include/video/tdfx.h
+++ b/include/video/tdfx.h
@@ -1,6 +1,9 @@
 #ifndef _TDFX_H
 #define _TDFX_H
 
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
 /* membase0 register offsets */
 #define STATUS          0x00
 #define PCIINIT0        0x04
@@ -123,6 +126,18 @@
 #define VIDCFG_PIXFMT_SHIFT             18
 #define DACMODE_2X                      BIT(0)
 
+/* I2C bit locations in the VIDSERPARPORT register */
+#define DDC_ENAB        0x00040000
+#define DDC_SCL_OUT     0x00080000
+#define DDC_SDA_OUT     0x00100000
+#define DDC_SCL_IN      0x00200000
+#define DDC_SDA_IN      0x00400000
+#define I2C_ENAB        0x00800000
+#define I2C_SCL_OUT     0x01000000
+#define I2C_SDA_OUT     0x02000000
+#define I2C_SCL_IN      0x04000000
+#define I2C_SDA_IN      0x08000000
+
 /* VGA rubbish, need to change this for multihead support */
 #define MISC_W          0x3c2
 #define MISC_R          0x3cc
@@ -168,12 +183,23 @@ struct banshee_reg {
         unsigned long miscinit0;
 };
 
+struct tdfx_par;
+
+struct tdfxfb_i2c_chan {
+        struct tdfx_par *par;
+        struct i2c_adapter adapter;
+        struct i2c_algo_bit_data algo;
+};
+
 struct tdfx_par {
         u32 max_pixclock;
         u32 palette[16];
         void __iomem *regbase_virt;
         unsigned long iobase;
         int mtrr_handle;
+#ifdef CONFIG_FB_3DFX_I2C
+        struct tdfxfb_i2c_chan chan[2];
+#endif
 };
 
 #endif  /* __KERNEL__ */