Hi Wolfgang,
On Mon, Jan 25, 2010 at 09:27:08AM +0100, Wolfgang Grandegger wrote:
> From: Wolfgang Grandegger <wg@xxxxxxx>
>
> 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.
>
> Signed-off-by: Wolfgang Grandegger <wg@xxxxxxx>
> ---
> drivers/i2c/busses/Kconfig | 9 ++--
> drivers/i2c/busses/i2c-mpc.c | 122 ++++++++++++++++++++++++++++++------------
> 2 files changed, 93 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 5f318ce..f481f30 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -418,13 +418,14 @@ config I2C_IXP2000
> instead.
>
> config I2C_MPC
> - tristate "MPC107/824x/85xx/52xx/86xx"
> + tristate "MPC107/824x/85xx/512x/52xx/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/MPC8240/MPC8245,
> + MPC85xx/MPC8641 and MPC512x family processors. The driver may
> + also work on 52xx family processors, though interrupts are known
> + not to work.
Opinion poll: Can we remove the "may work" sentence while we are here? It has
worked fine for years. BTW, which interrupts are meant here (from I2C slaves?
interrupts of the controller?)?
>
> 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 2cb864e..70c3e5d 100644
> --- a/drivers/i2c/busses/i2c-mpc.c
> +++ b/drivers/i2c/busses/i2c-mpc.c
> @@ -67,9 +67,8 @@ 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 +163,7 @@ 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 +215,18 @@ 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 == -1) {
Could we use 0 for 'no_clock'? This would make the above statement simply
if (!clock)
and saves us using -1 with a u32.
> + dev_dbg(i2c->dev, "using fdr %d\n",
> + readb(i2c->base + MPC_I2C_FDR));
> + return; /* preserve clocking */
> + }
> +
> ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
> fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
>
> @@ -230,13 +235,50 @@ 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 +364,19 @@ 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 == -1) {
> + dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",
> + readb(i2c->base + MPC_I2C_DFSRR),
> + readb(i2c->base + MPC_I2C_FDR));
> + return; /* preserve clocking */
> + }
> +
> ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
> fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
>
> @@ -340,9 +389,9 @@ 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 */
> @@ -525,21 +574,21 @@ 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 = -1;
> + } 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 = (struct mpc_i2c_data *)match->data;
The cast should not be necessary.
> + 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);
> @@ -585,20 +634,24 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
> };
>
> 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_512x = {
> + .setup = mpc_i2c_setup_512x,
> };
>
> 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 +659,7 @@ 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, },
> @@ -648,5 +702,5 @@ module_exit(fsl_i2c_exit);
>
> MODULE_AUTHOR("Adrian Cox <adrian@xxxxxxxxxxxxxx>");
> 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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Regards,
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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