Hi everyone,
This series rewrites the Allwinner/sunxi PSCI implementation in C, to make it easier to maintain and extend for the currently unsupported multi-cluster SoCs. The SMP code in the BSP kernels are in C. Having the PSCI code in C as well will make it easier to work on.
To be able to convert the platform bits to C, some common PSCI functions have to be fixed up according to the ARM calling conventions. Function declarations are also needed.
This series is based on sunxi/next. Parts of it will likely conflict with the effort to support PSCI 1.0 on the Freescale LS102xA.
Changes since v2:
- Add missing __secure attributes to helpers.
- Fix __mdelay calculation, and avoid calling __udivsi3.
- Add ISB at end of __mdelay, after disabling timer.
- Move ISB inside cp15_write_scr helper.
- Fix "End of interrupt" comment.
- __ARMV7_ALLOCATE_SECURE_STACK -> __ARMV7_PSCI_STACK_IN_RAM
- Split out power sequencing into more helpers as Marc suggested.
- Drop linux/compiler.h include from psci.h
Changes since v1:
- Add and use helpers for accessing co-processors.
- Split out power gating/clamping into helpers based on sun7i and the rest.
- Drop secure section attribute on PSCI common function declarations.
- Add packed attribute to PRCM and CPUCFG register struct definitions.
- Only allocate PSCI stack space when PSCI is put in main memory.
- Make it clear that PSCI stack overwriting normal memory only happens when PSCI is put in main memory.
- Drop "cc" from clobber list.
- Add comments explaining the need to preserve registers across psci_arch_init, and preserve r0 instead of setting it to 0.
Patch 1 fixes up psci_get_cpu_stack_top.
Patch 2 fixes up the PSCI version of v7_flush_dcache_all.
Patch 3 adds function declarations for some of the common PSCI functions.
Patch 4 fixes issues with reserving memory for the secure section.
Patch 5 unifies the CPUCFG_BASE macro names for various sunxi platforms.
Patch 6 adds packed attribute to struct sunxi_prcm_reg.
Patch 7 adds a missing header to cpucfg.h
Patch 8 groups cpu core related controls together into one struct per core. This makes it straightforward to access the controls by the cpu index.
Patch 9 adds some missing fields to cpucfg, which were used in the assembly code.
Patch 10 adds the base address for the GIC.
Patch 11 is the new PSCI implementation in C. Almost all of the code is converted, with the exception of initial setup of the stack.
Regards ChenYu
Chen-Yu Tsai (11): ARM: PSCI: use only r0 and r3 in psci_get_cpu_stack_top() ARM: PSCI: save and restore clobbered registers in v7_flush_dcache_all ARM: PSCI: export common PSCI function declarations for C code ARM: allocate extra space for PSCI stack in secure section during link phase sunxi: Make CPUCFG_BASE macro names the same across families sunxi: Add packed attribute to struct sunxi_prcm_reg sunxi: Add missing linux/types.h header for cpucfg_sun6i.h sunxi: Group cpu core related controls together sunxi: Add CPUCFG debug lock and sun7i cpu power controls sunxi: Add base address for GIC sunxi: Add PSCI implementation in C
arch/arm/cpu/armv7/psci.S | 20 +- arch/arm/cpu/armv7/sunxi/Makefile | 7 +- arch/arm/cpu/armv7/sunxi/psci.c | 273 +++++++++++++++++++++ arch/arm/cpu/armv7/sunxi/psci_head.S | 66 +++++ arch/arm/cpu/armv7/sunxi/psci_sun6i.S | 262 -------------------- arch/arm/cpu/armv7/sunxi/psci_sun7i.S | 237 ------------------ arch/arm/cpu/u-boot.lds | 7 + arch/arm/include/asm/arch-sunxi/cpu_sun4i.h | 17 +- .../asm/arch-sunxi/{cpucfg_sun6i.h => cpucfg.h} | 41 ++-- arch/arm/include/asm/arch-sunxi/prcm.h | 10 +- arch/arm/include/asm/psci.h | 7 + 11 files changed, 407 insertions(+), 540 deletions(-) create mode 100644 arch/arm/cpu/armv7/sunxi/psci.c create mode 100644 arch/arm/cpu/armv7/sunxi/psci_head.S delete mode 100644 arch/arm/cpu/armv7/sunxi/psci_sun6i.S delete mode 100644 arch/arm/cpu/armv7/sunxi/psci_sun7i.S rename arch/arm/include/asm/arch-sunxi/{cpucfg_sun6i.h => cpucfg.h} (67%)