[U-Boot] [PATCH] arm: imx6: configure NoC on i.MX6DQP
Christian Gmeiner
christian.gmeiner at gmail.com
Tue Mar 20 12:59:42 UTC 2018
Hi Filip
Is there any update on this patch? I am looking into imx6qp bring-up
and this looks like
a nice patch.
2016-10-04 10:51 GMT+02:00 Stefano Babic <sbabic at denx.de>:
> Hi Filip,
>
> On 14/09/2016 13:36, Filip Brozovic wrote:
>> The i.MX6DP and i.MX6QP incorporate NoC interconnect logic
>> which needs to be configured in order to use external DDR memory.
>>
>> This patch enables the SPL to configure the necessary registers
>> in accordance with the NXP engineering bulletin EB828.
>>
>> Signed-off-by: Filip Brozovic <fbrozovic at gmail.com>
>> ---
>> arch/arm/cpu/armv7/mx6/ddr.c | 69 +++++++++++++++++++++++++++++++++
>> arch/arm/include/asm/arch-mx6/mx6-ddr.h | 19 +++++++++
>> 2 files changed, 88 insertions(+)
>>
>> diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c
>> index 7beb7ea..60bfd08 100644
>> --- a/arch/arm/cpu/armv7/mx6/ddr.c
>> +++ b/arch/arm/cpu/armv7/mx6/ddr.c
>> @@ -1181,6 +1181,8 @@ void mx6_ddr3_cfg(const struct mx6_ddr_sysinfo *sysinfo,
>> {
>> volatile struct mmdc_p_regs *mmdc0;
>> volatile struct mmdc_p_regs *mmdc1;
>> + struct src *src_regs = (struct src *)SRC_BASE_ADDR;
>> + u8 soc_boot_cfg3 = ((readl(&src_regs->sbmr1) & 0xff0000) >> 16) & 0xff;
>> u32 val;
>> u8 tcke, tcksrx, tcksre, txpdll, taofpd, taonpd, trrd;
>> u8 todtlon, taxpd, tanpd, tcwl, txp, tfaw, tcl;
>> @@ -1473,6 +1475,73 @@ void mx6_ddr3_cfg(const struct mx6_ddr_sysinfo *sysinfo,
>> /* Step 12: Configure and activate periodic refresh */
>> mmdc0->mdref = (sysinfo->refsel << 14) | (sysinfo->refr << 11);
>>
>> + /*
>> + * i.MX6DQP only: If the NoC scheduler is enabled,
>> + * configure it and disable MMDC arbitration/reordering (see EB828)
>> + */
>> + if (is_mx6dqp() && ((soc_boot_cfg3 & 0x30) == 0x00 ||
>> + (soc_boot_cfg3 & 0x33) == 0x31))
>
> I would suggest you add defines for the value of the "DDR Memory Map
> default config" bit, because this is not very readable. And you add in
> the comment a reference to the manual, i.e. a reference to the table
> (5.5 ?) where BOOT_CFG3 is explained.
>
> {
>> + struct mx6dqp_noc_sched_regs *noc_sched =
>> + (struct mx6dqp_noc_sched_regs *)MX6DQP_NOC_SCHED_BASE;
>> +
>> + /* These values are fixed based on integration parameters and
>> + * should not be modified */
>
> Codestyle: Multi-line comment must be fixed
>
>> + noc_sched->rlat = 0x00000040;
>> + noc_sched->ipu1 = 0x00000020;
>> + noc_sched->ipu2 = 0x00000020;
>> +
>> + noc_sched->activate = (1 << 10) | /* FawBank */
>> + (tfaw << 4) |
>> + (trrd << 0);
>> + noc_sched->ddrtiming = (((sysinfo->dsize == 1) ? 1 : 0) << 31) |
>> + ((tcwl + twtr) << 26) |
>> + ((tcl - tcwl + 2) << 21) |
>> + (4 << 18) | /* Burst Length = 8 */
>> + ((tcwl + twr + trp + trcd) << 12) |
>> + ((trtp + trp + trcd - 4) << 6) |
>> + (trc << 0);
>> +
>
> Same here: what about to add defines for shifting and seting into the
> register ? This is not very nice to read it.
>
>
>> + if (sysinfo->dsize == 2) {
>> + if (ddr3_cfg->coladdr == 10) {
>> + if (ddr3_cfg->rowaddr == 15 &&
>> + sysinfo->ncs == 2)
>> + noc_sched->ddrconf = 4;
>> + else
>> + noc_sched->ddrconf = 0;
>> + } else if (ddr3_cfg->coladdr == 11) {
>> + noc_sched->ddrconf = 1;
>> + }
>> + } else {
>> + if (ddr3_cfg->coladdr == 9) {
>> + if (ddr3_cfg->rowaddr == 13)
>> + noc_sched->ddrconf = 2;
>> + else if (ddr3_cfg->rowaddr == 14)
>> + noc_sched->ddrconf = 15;
>> + } else if (ddr3_cfg->coladdr == 10) {
>> + if (ddr3_cfg->rowaddr == 14 &&
>> + sysinfo->ncs == 2)
>> + noc_sched->ddrconf = 14;
>> + else if (ddr3_cfg->rowaddr == 15 &&
>> + sysinfo->ncs == 2)
>> + noc_sched->ddrconf = 9;
>> + else
>> + noc_sched->ddrconf = 3;
>> + } else if (ddr3_cfg->coladdr == 11) {
>> + if (ddr3_cfg->rowaddr == 15 &&
>> + sysinfo->ncs == 2)
>> + noc_sched->ddrconf = 4;
>> + else
>> + noc_sched->ddrconf = 0;
>> + } else if (ddr3_cfg->coladdr == 12) {
>> + if (ddr3_cfg->rowaddr == 14)
>> + noc_sched->ddrconf = 1;
>> + }
>> + }
>> +
>> + /* Disable MMDC arbitration/reordering */
>> + mmdc0->maarcr = 0x14420000;
>> + }
>> +
>> /* Step 13: Deassert config request - init complete */
>> mmdc0->mdscr = 0x00000000;
>>
>> diff --git a/arch/arm/include/asm/arch-mx6/mx6-ddr.h b/arch/arm/include/asm/arch-mx6/mx6-ddr.h
>> index 9922409..c881782 100644
>> --- a/arch/arm/include/asm/arch-mx6/mx6-ddr.h
>> +++ b/arch/arm/include/asm/arch-mx6/mx6-ddr.h
>> @@ -307,6 +307,25 @@ struct mx6dq_iomux_grp_regs {
>> u32 grp_b6ds;
>> };
>>
>> +/*
>> + * NoC scheduler registers - only on IMX6DQP
>> + */
>> +#define MX6DQP_NOC_SCHED_BASE 0x00bb0000
>> +struct mx6dqp_noc_sched_regs {
>> + u32 coreid;
>> + u32 revid;
>> + u32 ddrconf;
>> + u32 ddrtiming;
>> + u32 ddrmode;
>> + u32 rlat;
>> + u32 res1[4];
>> + u32 ipu1;
>> + u32 ipu2;
>> + u32 res2[2];
>> + u32 activate;
>> + u32 res3[16];
>> +};
>> +
>> #define MX6SDL_IOM_DDR_BASE 0x020e0400
>> struct mx6sdl_iomux_ddr_regs {
>> u32 res1[25];
>>
>
> Best regards,
> Stefano Babic
>
> --
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--
greets
--
Christian Gmeiner, MSc
https://christian-gmeiner.info
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