[PATCH 3/3] sunxi: psci: implement PSCI on R528
Andre Przywara
andre.przywara at arm.com
Mon Aug 14 16:16:42 CEST 2023
On Fri, 11 Aug 2023 18:30:55 -0600
Sam Edwards <cfsworks at gmail.com> wrote:
Hi Sam,
> This patch adds the necessary code to make nonsec booting and PSCI
> secondary core management functional on the R528/T113.
Unfortunately this patch breaks the build on older 32-bit SoCs, as
SUNXI_CPUX_BASE is not defined there. That's a typical problem of the
"C-if" approach, but typically there is a clean, albeit not trivial,
solution:
It seems like SUNXI_CPUX_BASE and SUNXI_CPUCFG_BASE are mutually
exclusive, and I actually carry a "#define SUNXI_CPUCFG_BASE 0" hack in my
patches already.
So I wonder if we should unify those two into SUNXI_CPUCFG_BASE, with the
following rework:
> Signed-off-by: Sam Edwards <CFSworks at gmail.com>
> Tested-by: Maksim Kiselev <bigunclemax at gmail.com>
> ---
> arch/arm/cpu/armv7/sunxi/psci.c | 47 ++++++++++++++++++++++++++++++++-
> arch/arm/mach-sunxi/Kconfig | 2 ++
> include/configs/sunxi-common.h | 8 ++++++
> 3 files changed, 56 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/cpu/armv7/sunxi/psci.c b/arch/arm/cpu/armv7/sunxi/psci.c
> index 94120e7526..f3c1c459c2 100644
> --- a/arch/arm/cpu/armv7/sunxi/psci.c
> +++ b/arch/arm/cpu/armv7/sunxi/psci.c
> @@ -38,6 +38,19 @@
> #define SUN8I_R40_PWR_CLAMP(cpu) (0x120 + (cpu) * 0x4)
> #define SUN8I_R40_SRAMC_SOFT_ENTRY_REG0 (0xbc)
>
> +/*
> + * R528 is also different, as it has both cores powered up (but held in reset
> + * state) after the SoC is reset. Like the R40, it uses a "soft" entry point
> + * address register, but unlike the R40, it uses a newer "CPUX" block to manage
> + * CPU state, rather than the older CPUCFG system.
> + */
> +#define SUN8I_R528_SOFT_ENTRY (0x1c8)
> +#define SUN8I_R528_C0_RST_CTRL (0x0000)
> +#define SUN8I_R528_C0_CTRL_REG0 (0x0010)
> +#define SUN8I_R528_C0_CPU_STATUS (0x0080)
> +
> +#define SUN8I_R528_C0_STATUS_STANDBYWFI (16)
> +
> static void __secure cp15_write_cntp_tval(u32 tval)
> {
> asm volatile ("mcr p15, 0, %0, c14, c2, 0" : : "r" (tval));
> @@ -116,10 +129,13 @@ static void __secure sunxi_power_switch(u32 *clamp, u32 *pwroff, bool on,
>
> static void __secure sunxi_cpu_set_entry(int __always_unused cpu, void *entry)
> {
> - /* secondary core entry address is programmed differently on R40 */
> + /* secondary core entry address is programmed differently on R40/528 */
> if (IS_ENABLED(CONFIG_MACH_SUN8I_R40)) {
> writel((u32)entry,
> SUNXI_SRAMC_BASE + SUN8I_R40_SRAMC_SOFT_ENTRY_REG0);
> + } else if (IS_ENABLED(CONFIG_MACH_SUN8I_R528)) {
> + writel((u32)entry,
> + SUNXI_R_CPUCFG_BASE + SUN8I_R528_SOFT_ENTRY);
> } else {
> struct sunxi_cpucfg_reg *cpucfg =
> (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE;
> @@ -139,6 +155,8 @@ static void __secure sunxi_cpu_set_power(int cpu, bool on)
> } else if (IS_ENABLED(CONFIG_MACH_SUN8I_R40)) {
> sunxi_power_switch(NULL, (void *)cpucfg + SUN8I_R40_PWROFF,
> on, cpu);
> + } else if (IS_ENABLED(CONFIG_MACH_SUN8I_R528)) {
> + /* R528 leaves both cores powered up, manages them via reset */
> } else {
> #if !defined(CONFIG_SUN50I_GEN_H6) && !defined(CONFIG_SUNXI_GEN_NCAT2)
> struct sunxi_prcm_reg *prcm =
> @@ -159,6 +177,17 @@ static void __secure sunxi_cpu_set_reset(int cpu, bool reset)
> struct sunxi_cpucfg_reg *cpucfg =
> (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE;
Can you check what it would take to get rid of this struct altogether, and
replace accesses with "SUNXI_CPUCFG_BASE + REG_OFFSET", similiar to what
you do for the R528?
I was never a friend of ab-using C structs to model hardware register
layouts, so it seems like a good excuse to get rid of that here ;-)
Then we can define SUNXI_CPUCFG_BASE everywhere, and don't need SUNXI_CPUX_BASE.
Or do I miss something here?
Cheers,
Andre
P.S.: You can test-build for all SoCs with buildman:
$ tools/buildman/buildman -j 4 sunxi
(you might need some setup in ~/.buildman to announce your cross-compilers)
Or you just build one board per SoC, for instance "Bananapi_defconfig" for
the A20.
>
> + if (IS_ENABLED(CONFIG_MACH_SUN8I_R528)) {
> + if (reset) {
> + clrbits_le32(SUNXI_CPUX_BASE + SUN8I_R528_C0_RST_CTRL,
> + BIT(cpu));
> + } else {
> + setbits_le32(SUNXI_CPUX_BASE + SUN8I_R528_C0_RST_CTRL,
> + BIT(cpu));
> + }
> + return;
> + }
> +
> writel(reset ? 0b00 : 0b11, &cpucfg->cpu[cpu].rst);
> }
>
> @@ -167,6 +196,11 @@ static void __secure sunxi_cpu_set_locking(int cpu, bool lock)
> struct sunxi_cpucfg_reg *cpucfg =
> (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE;
>
> + if (IS_ENABLED(CONFIG_MACH_SUN8I_R528)) {
> + /* Not required on R528 */
> + return;
> + }
> +
> if (lock)
> clrbits_le32(&cpucfg->dbg_ctrl1, BIT(cpu));
> else
> @@ -178,6 +212,11 @@ static bool __secure sunxi_cpu_poll_wfi(int cpu)
> struct sunxi_cpucfg_reg *cpucfg =
> (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE;
>
> + if (IS_ENABLED(CONFIG_MACH_SUN8I_R528)) {
> + return !!(readl(SUNXI_CPUX_BASE + SUN8I_R528_C0_CPU_STATUS) &
> + BIT(SUN8I_R528_C0_STATUS_STANDBYWFI + cpu));
> + }
> +
> return !!(readl(&cpucfg->cpu[cpu].status) & BIT(2));
> }
>
> @@ -186,6 +225,12 @@ static void __secure sunxi_cpu_invalidate_cache(int cpu)
> struct sunxi_cpucfg_reg *cpucfg =
> (struct sunxi_cpucfg_reg *)SUNXI_CPUCFG_BASE;
>
> + if (IS_ENABLED(CONFIG_MACH_SUN8I_R528)) {
> + clrbits_le32(SUNXI_CPUX_BASE + SUN8I_R528_C0_CTRL_REG0,
> + BIT(cpu));
> + return;
> + }
> +
> clrbits_le32(&cpucfg->gen_ctrl, BIT(cpu));
> }
>
> diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
> index 0a3454a51a..d46fd8c0bc 100644
> --- a/arch/arm/mach-sunxi/Kconfig
> +++ b/arch/arm/mach-sunxi/Kconfig
> @@ -355,6 +355,8 @@ config MACH_SUN8I_R40
> config MACH_SUN8I_R528
> bool "sun8i (Allwinner R528)"
> select CPU_V7A
> + select CPU_V7_HAS_NONSEC
> + select ARCH_SUPPORT_PSCI
> select SUNXI_GEN_NCAT2
> select SUNXI_NEW_PINCTRL
> select MMC_SUNXI_HAS_NEW_MODE
> diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
> index b8ca77d031..67eb0d25db 100644
> --- a/include/configs/sunxi-common.h
> +++ b/include/configs/sunxi-common.h
> @@ -33,6 +33,14 @@
>
> /* CPU */
>
> +/*
> + * Newer ARM SoCs have moved the GIC, but have not updated their ARM cores to
> + * reflect the correct address in CBAR/PERIPHBASE.
> + */
> +#if defined(CONFIG_SUN50I_GEN_H6) || defined(CONFIG_SUNXI_GEN_NCAT2)
> +#define CFG_ARM_GIC_BASE_ADDRESS 0x03020000
> +#endif
> +
> /*
> * The DRAM Base differs between some models. We cannot use macros for the
> * CONFIG_FOO defines which contain the DRAM base address since they end
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