[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
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss at lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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