3 files changed, 124 insertions, 88 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 10041813c6ed..ecf079b7f931 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -419,13 +419,12 @@ config I2C_IXP2000
           instead.
 
 config I2C_MPC
-        tristate "MPC107/824x/85xx/52xx/86xx"
+        tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
         depends on PPC32
         help
           If you say yes to this option, support will be included for the
-          built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
-          MPC85xx/MPC8641 family processors. The driver may also work on 52xx
-          family processors, though interrupts are known not to work.
+          built-in I2C interface on the MPC107, Tsi107, MPC512x, MPC52xx,
+          MPC8240, MPC8245, MPC83xx, MPC85xx and MPC8641 family processors.
 
           This driver can also be built as a module.  If so, the module
           will be called i2c-mpc.
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index f627001108b8..78a15af32942 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -31,6 +31,9 @@
 
 #define DRV_NAME "mpc-i2c"
 
+#define MPC_I2C_CLOCK_LEGACY   0
+#define MPC_I2C_CLOCK_PRESERVE (~0U)
+
 #define MPC_I2C_FDR   0x04
 #define MPC_I2C_CR    0x08
 #define MPC_I2C_SR    0x0c
@@ -66,10 +69,9 @@ struct mpc_i2c_divider {
         u16 fdr;        /* including dfsrr */
 };
 
-struct mpc_i2c_match_data {
-        void (*setclock)(struct device_node *node,
-                         struct mpc_i2c *i2c,
-                         u32 clock, u32 prescaler);
+struct mpc_i2c_data {
+        void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
+                      u32 clock, u32 prescaler);
         u32 prescaler;
 };
 
@@ -164,8 +166,8 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
         return 0;
 }
 
-#ifdef CONFIG_PPC_MPC52xx
-static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
+#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
+static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] __devinitconst = {
         {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
         {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
         {36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
@@ -186,14 +188,15 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
         {10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
 };
 
-int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
+static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
+                                          int prescaler)
 {
         const struct mpc_i2c_divider *div = NULL;
         unsigned int pvr = mfspr(SPRN_PVR);
         u32 divider;
         int i;
 
-        if (!clock)
+        if (clock == MPC_I2C_CLOCK_LEGACY)
                 return -EINVAL;
 
         /* Determine divider value */
@@ -215,12 +218,18 @@ int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
         return div ? (int)div->fdr : -EINVAL;
 }
 
-static void mpc_i2c_setclock_52xx(struct device_node *node,
-                                  struct mpc_i2c *i2c,
-                                  u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+                                         struct mpc_i2c *i2c,
+                                         u32 clock, u32 prescaler)
 {
         int ret, fdr;
 
+        if (clock == MPC_I2C_CLOCK_PRESERVE) {
+                dev_dbg(i2c->dev, "using fdr %d\n",
+                        readb(i2c->base + MPC_I2C_FDR));
+                return;
+        }
+
         ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
         fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
 
@@ -229,16 +238,52 @@ static void mpc_i2c_setclock_52xx(struct device_node *node,
         if (ret >= 0)
                 dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
 }
-#else /* !CONFIG_PPC_MPC52xx */
-static void mpc_i2c_setclock_52xx(struct device_node *node,
-                                  struct mpc_i2c *i2c,
-                                  u32 clock, u32 prescaler)
+#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */
+static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
+                                         struct mpc_i2c *i2c,
+                                         u32 clock, u32 prescaler)
+{
+}
+#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */
+
+#ifdef CONFIG_PPC_MPC512x
+static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+                                         struct mpc_i2c *i2c,
+                                         u32 clock, u32 prescaler)
+{
+        struct device_node *node_ctrl;
+        void __iomem *ctrl;
+        const u32 *pval;
+        u32 idx;
+
+        /* Enable I2C interrupts for mpc5121 */
+        node_ctrl = of_find_compatible_node(NULL, NULL,
+                                            "fsl,mpc5121-i2c-ctrl");
+        if (node_ctrl) {
+                ctrl = of_iomap(node_ctrl, 0);
+                if (ctrl) {
+                        /* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */
+                        pval = of_get_property(node, "reg", NULL);
+                        idx = (*pval & 0xff) / 0x20;
+                        setbits32(ctrl, 1 << (24 + idx * 2));
+                        iounmap(ctrl);
+                }
+                of_node_put(node_ctrl);
+        }
+
+        /* The clock setup for the 52xx works also fine for the 512x */
+        mpc_i2c_setup_52xx(node, i2c, clock, prescaler);
+}
+#else /* CONFIG_PPC_MPC512x */
+static void __devinit mpc_i2c_setup_512x(struct device_node *node,
+                                         struct mpc_i2c *i2c,
+                                         u32 clock, u32 prescaler)
 {
 }
-#endif /* CONFIG_PPC_MPC52xx*/
+#endif /* CONFIG_PPC_MPC512x */
 
 #ifdef CONFIG_FSL_SOC
-static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
+static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] __devinitconst = {
         {160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
         {288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
         {416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
@@ -258,7 +303,7 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
         {49152, 0x011e}, {61440, 0x011f}
 };
 
-u32 mpc_i2c_get_sec_cfg_8xxx(void)
+static u32 __devinit mpc_i2c_get_sec_cfg_8xxx(void)
 {
         struct device_node *node = NULL;
         u32 __iomem *reg;
@@ -287,13 +332,14 @@ u32 mpc_i2c_get_sec_cfg_8xxx(void)
         return val;
 }
 
-int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
+static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
+                                          u32 prescaler)
 {
         const struct mpc_i2c_divider *div = NULL;
         u32 divider;
         int i;
 
-        if (!clock)
+        if (clock == MPC_I2C_CLOCK_LEGACY)
                 return -EINVAL;
 
         /* Determine proper divider value */
@@ -320,12 +366,19 @@ int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
         return div ? (int)div->fdr : -EINVAL;
 }
 
-static void mpc_i2c_setclock_8xxx(struct device_node *node,
-                                  struct mpc_i2c *i2c,
-                                  u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+                                         struct mpc_i2c *i2c,
+                                         u32 clock, u32 prescaler)
 {
         int ret, fdr;
 
+        if (clock == MPC_I2C_CLOCK_PRESERVE) {
+                dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
+                        readb(i2c->base + MPC_I2C_DFSRR),
+                        readb(i2c->base + MPC_I2C_FDR));
+                return;
+        }
+
         ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
         fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
 
@@ -338,9 +391,9 @@ static void mpc_i2c_setclock_8xxx(struct device_node *node,
 }
 
 #else /* !CONFIG_FSL_SOC */
-static void mpc_i2c_setclock_8xxx(struct device_node *node,
-                                  struct mpc_i2c *i2c,
-                                  u32 clock, u32 prescaler)
+static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
+                                         struct mpc_i2c *i2c,
+                                         u32 clock, u32 prescaler)
 {
 }
 #endif /* CONFIG_FSL_SOC */
@@ -494,7 +547,7 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
 {
         struct mpc_i2c *i2c;
         const u32 *prop;
-        u32 clock = 0;
+        u32 clock = MPC_I2C_CLOCK_LEGACY;
         int result = 0;
         int plen;
 
@@ -523,21 +576,21 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
                 }
         }
 
-        if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
+        if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
+                clock = MPC_I2C_CLOCK_PRESERVE;
+        } else {
                 prop = of_get_property(op->node, "clock-frequency", &plen);
                 if (prop && plen == sizeof(u32))
                         clock = *prop;
+        }
 
-                if (match->data) {
-                        struct mpc_i2c_match_data *data =
-                                (struct mpc_i2c_match_data *)match->data;
-                        data->setclock(op->node, i2c, clock, data->prescaler);
-                } else {
-                        /* Backwards compatibility */
-                        if (of_get_property(op->node, "dfsrr", NULL))
-                                mpc_i2c_setclock_8xxx(op->node, i2c,
-                                                      clock, 0);
-                }
+        if (match->data) {
+                struct mpc_i2c_data *data = match->data;
+                data->setup(op->node, i2c, clock, data->prescaler);
+        } else {
+                /* Backwards compatibility */
+                if (of_get_property(op->node, "dfsrr", NULL))
+                        mpc_i2c_setup_8xxx(op->node, i2c, clock, 0);
         }
 
         dev_set_drvdata(&op->dev, i2c);
@@ -582,47 +635,42 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
         return 0;
 };
 
+static struct mpc_i2c_data mpc_i2c_data_512x __devinitdata = {
+        .setup = mpc_i2c_setup_512x,
+};
+
+static struct mpc_i2c_data mpc_i2c_data_52xx __devinitdata = {
+        .setup = mpc_i2c_setup_52xx,
+};
+
+static struct mpc_i2c_data mpc_i2c_data_8313 __devinitdata = {
+        .setup = mpc_i2c_setup_8xxx,
+};
+
+static struct mpc_i2c_data mpc_i2c_data_8543 __devinitdata = {
+        .setup = mpc_i2c_setup_8xxx,
+        .prescaler = 2,
+};
+
+static struct mpc_i2c_data mpc_i2c_data_8544 __devinitdata = {
+        .setup = mpc_i2c_setup_8xxx,
+        .prescaler = 3,
+};
+
 static const struct of_device_id mpc_i2c_of_match[] = {
-        {.compatible = "mpc5200-i2c",
-         .data = &(struct mpc_i2c_match_data) {
-                        .setclock = mpc_i2c_setclock_52xx,
-                },
-        },
-        {.compatible = "fsl,mpc5200b-i2c",
-         .data = &(struct mpc_i2c_match_data) {
-                        .setclock = mpc_i2c_setclock_52xx,
-                },
-        },
-        {.compatible = "fsl,mpc5200-i2c",
-         .data = &(struct mpc_i2c_match_data) {
-                        .setclock = mpc_i2c_setclock_52xx,
-                },
-        },
-        {.compatible = "fsl,mpc8313-i2c",
-         .data = &(struct mpc_i2c_match_data) {
-                        .setclock = mpc_i2c_setclock_8xxx,
-                },
-        },
-        {.compatible = "fsl,mpc8543-i2c",
-         .data = &(struct mpc_i2c_match_data) {
-                        .setclock = mpc_i2c_setclock_8xxx,
-                        .prescaler = 2,
-                },
-        },
-        {.compatible = "fsl,mpc8544-i2c",
-         .data = &(struct mpc_i2c_match_data) {
-                        .setclock = mpc_i2c_setclock_8xxx,
-                        .prescaler = 3,
-                },
+        {.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
+        {.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
+        {.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
+        {.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
+        {.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
+        {.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
+        {.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
         /* Backward compatibility */
-        },
         {.compatible = "fsl-i2c", },
         {},
 };
-
 MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
 
-
 /* Structure for a device driver */
 static struct of_platform_driver mpc_i2c_driver = {
         .match_table    = mpc_i2c_of_match,
@@ -655,5 +703,5 @@ module_exit(fsl_i2c_exit);
 
 MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
 MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
-                   "MPC824x/85xx/52xx processors");
+                   "MPC824x/83xx/85xx/86xx/512x/52xx processors");
 MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c
index 2b0bd0b042d6..9532dee6b580 100644
--- a/drivers/i2c/busses/i2c-pnx.c
+++ b/drivers/i2c/busses/i2c-pnx.c
@@ -172,12 +172,6 @@ static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data)
                 /* We still have something to talk about... */
                 val = *alg_data->mif.buf++;
 
-                if (alg_data->mif.len == 1) {
-                        val |= stop_bit;
-                        if (!alg_data->last)
-                                val |= start_bit;
-                }
-
                 alg_data->mif.len--;
                 iowrite32(val, I2C_REG_TX(alg_data));
 
@@ -251,11 +245,6 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data)
                         __func__);
 
                 if (alg_data->mif.len == 1) {
-                        /* Last byte, do not acknowledge next rcv. */
-                        val |= stop_bit;
-                        if (!alg_data->last)
-                                val |= start_bit;
-
                         /*
                          * Enable interrupt RFDAIE (data in Rx fifo),
                          * and disable DRMIE (need data for Tx)