[PATCH v4 2/3] i2c-mpc: add support for the MPC512x processors from Freescale

Grant Likely grant.likely at secretlab.ca
Wed Feb 10 04:45:27 EST 2010


On Thu, Jan 28, 2010 at 6:25 AM, Wolfgang Grandegger <wg at grandegger.com> wrote:
> From: Wolfgang Grandegger <wg at denx.de>
>
> The "setclock" initialization functions have been renamed to "setup"
> because I2C interrupts must be enabled for the MPC512x. This requires
> to handle "fsl,preserve-clocking" in a slighly different way. Also,
> the old settings are now reported calling dev_dbg(). For the MPC512x
> the clock setup function of the MPC52xx can be re-used. Furthermore,
> the Kconfig help has been updated and corrected.

Please split the rename portion into a separate patch.

Otherwise this looks pretty okay.
g.

>
> Signed-off-by: Wolfgang Grandegger <wg at denx.de>
> ---
>  drivers/i2c/busses/Kconfig   |    7 +-
>  drivers/i2c/busses/i2c-mpc.c |  127 ++++++++++++++++++++++++++++++------------
>  2 files changed, 94 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 5f318ce..5477e41 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -418,13 +418,12 @@ 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 275ebe6..1af0730 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_SAFE     0
> +#define MPC_I2C_CLOCK_PRESERVE (~0U)
> +
>  #define MPC_I2C_FDR   0x04
>  #define MPC_I2C_CR    0x08
>  #define MPC_I2C_SR    0x0c
> @@ -67,9 +70,8 @@ struct mpc_i2c_divider {
>  };
>
>  struct mpc_i2c_data {
> -       void (*setclock)(struct device_node *node,
> -                        struct mpc_i2c *i2c,
> -                        u32 clock, u32 prescaler);
> +       void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
> +                     u32 clock, u32 prescaler);
>        u32 prescaler;
>  };
>
> @@ -164,7 +166,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
>        return 0;
>  }
>
> -#ifdef CONFIG_PPC_MPC52xx
> +#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
>  static const struct __devinitdata mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
>        {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
>        {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
> @@ -216,12 +218,18 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
>        return div ? (int)div->fdr : -EINVAL;
>  }
>
> -static void __devinit 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 */
>
> @@ -230,13 +238,49 @@ static void __devinit 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 __devinit 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 __devinitdata mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
> @@ -322,12 +366,19 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
>        return div ? (int)div->fdr : -EINVAL;
>  }
>
> -static void __devinit 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 */
>
> @@ -340,9 +391,9 @@ static void __devinit mpc_i2c_setclock_8xxx(struct device_node *node,
>  }
>
>  #else /* !CONFIG_FSL_SOC */
> -static void __devinit 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 */
> @@ -496,7 +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_SAFE;
>        int result = 0;
>        int plen;
>
> @@ -525,21 +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_data *data =
> -                               (struct mpc_i2c_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);
> @@ -584,21 +635,25 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
>        return 0;
>  };
>
> +static struct mpc_i2c_data __devinitdata mpc_i2c_data_512x = {
> +       .setup = mpc_i2c_setup_512x,
> +};
> +
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_52xx = {
> -       .setclock = mpc_i2c_setclock_52xx,
> +       .setup = mpc_i2c_setup_52xx,
>  };
>
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8313 = {
> -       .setclock = mpc_i2c_setclock_8xxx,
> +       .setup = mpc_i2c_setup_8xxx,
>  };
>
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8543 = {
> -       .setclock = mpc_i2c_setclock_8xxx,
> +       .setup = mpc_i2c_setup_8xxx,
>        .prescaler = 2,
>  };
>
>  static struct mpc_i2c_data __devinitdata mpc_i2c_data_8544 = {
> -       .setclock = mpc_i2c_setclock_8xxx,
> +       .setup = mpc_i2c_setup_8xxx,
>        .prescaler = 3,
>  };
>
> @@ -606,6 +661,7 @@ static const struct of_device_id mpc_i2c_of_match[] = {
>        {.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, },
> @@ -615,7 +671,6 @@ static const struct of_device_id mpc_i2c_of_match[] = {
>  };
>  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,
> @@ -648,5 +703,5 @@ module_exit(fsl_i2c_exit);
>
>  MODULE_AUTHOR("Adrian Cox <adrian at humboldt.co.uk>");
>  MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
> -                  "MPC824x/85xx/52xx processors");
> +                  "MPC824x/85xx/512x/52xx processors");
>  MODULE_LICENSE("GPL");
> --
> 1.6.2.5
>
> _______________________________________________
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>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.


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