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Date: Thu, 29 Apr 2010 10:08:30 +0200
From: Wolfgang Grandegger <wg@...ndegger.com>
To: Richard Cochran <richardcochran@...il.com>
CC: netdev@...r.kernel.org,
devicetree-discuss <devicetree-discuss@...abs.org>
Subject: Re: [PATCH 0/3] [RFC] ptp: IEEE 1588 clock support
Richard Cochran wrote:
> On Wed, Apr 28, 2010 at 04:31:35PM +0200, Wolfgang Grandegger wrote:
>> That's because some 1588_PPS related bits are not yet setup in the
>> platform code of mainline kernel.
>
> So did you get it working?
Yes, it works now :-). With
master: ptpd -b eth1 -y 0 -a 3,12 -p
slave : ptpd -b eth1 -y 0 -a 3,12
I see a PPS jitter of approximately +-100ns on the oscilloscopes. That's
the same value I get with the Freescale's old PTP 1588 implementation.
> I am reworking this patch set to post again, but perhaps you might
> take a look at the patch below. It configures the gianfar PTP clock
I will comment on your previous patches later today.
> parameters via the device tree.
>
> Richard
>
> [PATCH] ptp: gianfar clock uses device tree parameters
> Signed-off-by: Richard Cochran <richard.cochran@...cron.at>
> ---
> arch/powerpc/boot/dts/mpc8313erdb.dts | 14 +++++
> arch/powerpc/boot/dts/p2020ds.dts | 13 ++++
> arch/powerpc/boot/dts/p2020rdb.dts | 14 +++++
> drivers/net/gianfar_ptp.c | 102 ++++++++++++++++++++++----------
> 4 files changed, 111 insertions(+), 32 deletions(-)
>
> diff --git a/arch/powerpc/boot/dts/mpc8313erdb.dts b/arch/powerpc/boot/dts/mpc8313erdb.dts
> index 183f2aa..b760aee 100644
> --- a/arch/powerpc/boot/dts/mpc8313erdb.dts
> +++ b/arch/powerpc/boot/dts/mpc8313erdb.dts
> @@ -208,6 +208,20 @@
> sleep = <&pmc 0x00300000>;
> };
>
> + ptp_clock@...00 {
> + device_type = "ptp_clock";
> + model = "eTSEC";
> + reg = <0x24E00 0xB0>;
> + interrupts = <0x0C 2 0x0D 2>;
The interrupt number is usually specified in decimal notation.
> + interrupt-parent = < &ipic >;
> + tclk_period = <10>;
> + tmr_prsc = <100>;
> + tmr_add = <0x999999A4>;
> + cksel = <0x1>;
> + tmr_fiper1 = <0x3B9AC9F6>;
> + tmr_fiper2 = <0x00018696>;
> + };
You should use the prefix "fsl," for the MPC-specific properties, at
least. A few of the values could be calculated from the clock frequency.
OF people usually prefer human readable values, if feasible, e.g.
ptp-clock-source = "sys";
ptp-clock-source = "ext";
ptp-clock-frequency = "100000000";
Not sure it that works for other PTP hardware but it would be nice to
have a generic set of properties. I have added a CC to the device-tree
discuss mailing for further feedback.
> +
> enet0: ethernet@...00 {
> #address-cells = <1>;
> #size-cells = <1>;
> diff --git a/arch/powerpc/boot/dts/p2020ds.dts b/arch/powerpc/boot/dts/p2020ds.dts
> index 1101914..1dcf790 100644
> --- a/arch/powerpc/boot/dts/p2020ds.dts
> +++ b/arch/powerpc/boot/dts/p2020ds.dts
> @@ -336,6 +336,19 @@
> phy_type = "ulpi";
> };
>
> + ptp_clock@...00 {
> + device_type = "ptp_clock";
> + model = "eTSEC";
> + reg = <0x24E00 0xB0>;
> + interrupts = <0x0C 2 0x0D 2>;
> + interrupt-parent = < &mpic >;
> + tclk_period = <5>;
> + tmr_prsc = <200>;
> + tmr_add = <0xCCCCCCCD>;
> + tmr_fiper1 = <0x3B9AC9FB>;
> + tmr_fiper2 = <0x0001869B>;
> + };
> +
> enet0: ethernet@...00 {
> #address-cells = <1>;
> #size-cells = <1>;
> diff --git a/arch/powerpc/boot/dts/p2020rdb.dts b/arch/powerpc/boot/dts/p2020rdb.dts
> index da4cb0d..ba61e8e 100644
> --- a/arch/powerpc/boot/dts/p2020rdb.dts
> +++ b/arch/powerpc/boot/dts/p2020rdb.dts
> @@ -396,6 +396,20 @@
> phy_type = "ulpi";
> };
>
> + ptp_clock@...00 {
> + device_type = "ptp_clock";
> + model = "eTSEC";
> + reg = <0x24E00 0xB0>;
> + interrupts = <0x0C 2 0x0D 2>;
> + interrupt-parent = < &mpic >;
> + tclk_period = <5>;
> + tmr_prsc = <200>;
> + tmr_add = <0xCCCCCCCD>;
> + cksel = <1>;
> + tmr_fiper1 = <0x3B9AC9FB>;
> + tmr_fiper2 = <0x0001869B>;
> + };
> +
> enet0: ethernet@...00 {
> #address-cells = <1>;
> #size-cells = <1>;
> diff --git a/drivers/net/gianfar_ptp.c b/drivers/net/gianfar_ptp.c
> index eed3246..ed6234c 100644
> --- a/drivers/net/gianfar_ptp.c
> +++ b/drivers/net/gianfar_ptp.c
> @@ -22,6 +22,8 @@
> #include <linux/init.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> #include <linux/timex.h>
> #include <asm/io.h>
>
> @@ -29,29 +31,16 @@
>
> #include "gianfar_ptp_reg.h"
>
> -/*
> - *
> - * TODO - get the following from device tree
> - *
> - */
> -#define TMR_BASE_KERNEL 0xe0024e00 // CONFIG_PPC_85xx 0xffe24e00
> -#define TIMER_OSC 166666666
> -#define TCLK_PERIOD 10
> -#define NOMINAL_FREQ 100000000
> -#define DEF_TMR_PRSC 100
> -#define DEF_TMR_ADD 0x999999A4
> -#define DEFAULT_CKSEL 1
> -
> #define REG_SIZE (4 + TMR_ETTS2_L)
>
> struct etsects {
> void *regs;
> - u32 timer_osc; /* Hz */
> u32 tclk_period; /* nanoseconds */
> - s64 nominal_freq; /* Hz */
> u32 tmr_prsc;
> u32 tmr_add;
> u32 cksel;
> + u32 tmr_fiper1;
> + u32 tmr_fiper2;
> };
>
> /* Private globals */
> @@ -111,8 +100,8 @@ static void set_fipers(struct etsects *etsects)
>
> reg_write(etsects, TMR_CTRL, tmr_ctrl & (~TE));
> reg_write(etsects, TMR_PRSC, etsects->tmr_prsc);
> - reg_write(etsects, TMR_FIPER1, 0x3B9AC9F6);
> - reg_write(etsects, TMR_FIPER2, 0x00018696);
> + reg_write(etsects, TMR_FIPER1, etsects->tmr_fiper1);
> + reg_write(etsects, TMR_FIPER2, etsects->tmr_fiper2);
> set_alarm(etsects);
> reg_write(etsects, TMR_CTRL, tmr_ctrl|TE);
> }
> @@ -213,34 +202,51 @@ struct ptp_clock_info ptp_gianfar_caps = {
> .enable = ptp_gianfar_enable,
> };
>
> -/* module operations */
> +/* OF device tree */
>
> -static void __exit ptp_gianfar_exit(void)
> +static int get_of_u32(struct device_node *node, char *str, u32 *val)
> {
> - ptp_clock_unregister(&ptp_gianfar_caps);
> - iounmap(the_clock.regs);
> + int plen;
> + const u32 *prop = of_get_property(node, str, &plen);
> +
> + if (!prop || plen != sizeof(*prop))
> + return -1;
> + *val = *prop;
> + return 0;
> }
>
> -static int __init ptp_gianfar_init(void)
> +static int gianfar_ptp_probe(struct of_device* dev,
> + const struct of_device_id *match)
> {
> + u64 addr, size;
> + struct device_node *node = dev->node;
> struct etsects *etsects = &the_clock;
> struct timespec now;
> - phys_addr_t reg_addr = TMR_BASE_KERNEL;
> - unsigned long reg_size = REG_SIZE;
> + phys_addr_t reg_addr;
> + unsigned long reg_size;
> u32 tmr_ctrl;
> int err;
>
> + if (get_of_u32(node, "tclk_period", &etsects->tclk_period) ||
> + get_of_u32(node, "tmr_prsc", &etsects->tmr_prsc) ||
> + get_of_u32(node, "tmr_add", &etsects->tmr_add) ||
> + get_of_u32(node, "cksel", &etsects->cksel) ||
> + get_of_u32(node, "tmr_fiper1", &etsects->tmr_fiper1) ||
> + get_of_u32(node, "tmr_fiper2", &etsects->tmr_fiper2))
> + return -ENODEV;
> +
> + addr = of_translate_address(node, of_get_address(node, 0, &size, NULL));
> + reg_addr = addr;
> + reg_size = size;
> + if (reg_size < REG_SIZE) {
> + pr_warning("device tree reg range %lu too small\n", reg_size);
> + reg_size = REG_SIZE;
> + }
> etsects->regs = ioremap(reg_addr, reg_size);
> if (!etsects->regs) {
> pr_err("ioremap ptp registers failed\n");
> return -EINVAL;
> }
> - etsects->timer_osc = TIMER_OSC;
> - etsects->tclk_period = TCLK_PERIOD;
> - etsects->nominal_freq = NOMINAL_FREQ;
> - etsects->tmr_prsc = DEF_TMR_PRSC;
> - etsects->tmr_add = DEF_TMR_ADD;
> - etsects->cksel = DEFAULT_CKSEL;
>
> tmr_ctrl =
> (etsects->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
> @@ -252,8 +258,8 @@ static int __init ptp_gianfar_init(void)
> reg_write(etsects, TMR_CTRL, tmr_ctrl);
> reg_write(etsects, TMR_ADD, etsects->tmr_add);
> reg_write(etsects, TMR_PRSC, etsects->tmr_prsc);
> - reg_write(etsects, TMR_FIPER1, 0x3B9AC9F6);
> - reg_write(etsects, TMR_FIPER2, 0x00018696);
> + reg_write(etsects, TMR_FIPER1, etsects->tmr_fiper1);
> + reg_write(etsects, TMR_FIPER2, etsects->tmr_fiper2);
> set_alarm(etsects);
> reg_write(etsects, TMR_CTRL, tmr_ctrl|FS|RTPE|TE);
>
> @@ -261,6 +267,38 @@ static int __init ptp_gianfar_init(void)
> return err;
> }
>
> +static int gianfar_ptp_remove(struct of_device* dev)
> +{
> + ptp_clock_unregister(&ptp_gianfar_caps);
> + iounmap(the_clock.regs);
> + return 0;
> +}
> +
> +static struct of_device_id match_table[] = {
> + { .type = "ptp_clock" },
> + {},
> +};
> +
> +static struct of_platform_driver gianfar_ptp_driver = {
> + .name = "gianfar_ptp",
> + .match_table = match_table,
> + .owner = THIS_MODULE,
> + .probe = gianfar_ptp_probe,
> + .remove = gianfar_ptp_remove,
> +};
> +
> +/* module operations */
> +
> +static void __exit ptp_gianfar_exit(void)
> +{
> + of_unregister_platform_driver(&gianfar_ptp_driver);
> +}
> +
> +static int __init ptp_gianfar_init(void)
> +{
> + return of_register_platform_driver(&gianfar_ptp_driver);
> +}
> +
> subsys_initcall(ptp_gianfar_init);
> module_exit(ptp_gianfar_exit);
Wolfgang.
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