[U-Boot] [V2] [PATCH 7/8] sun8i: Enable PSCI cpu_on support for A83t
tpearson at raptorengineering.com
tpearson at raptorengineering.com
Tue May 17 21:37:15 CEST 2016
This patch adds support for the PSCI cpu_on command on Allwinner
A83t devices. Since cluster 1 is already set up by early init,
the majority of this patch focuses on adding multi-cluster support
to PSCI and A83t power sequencing.
Signed-off-by: Timothy Pearson <tpearson at raptorengineering.com>
---
arch/arm/cpu/armv7/sunxi/psci_sun6i.S | 174 ++++++++++++++++++++++++++++++++--
1 file changed, 164 insertions(+), 10 deletions(-)
diff --git a/arch/arm/cpu/armv7/sunxi/psci_sun6i.S b/arch/arm/cpu/armv7/sunxi/psci_sun6i.S
index d35b63e..b3090ec 100644
--- a/arch/arm/cpu/armv7/sunxi/psci_sun6i.S
+++ b/arch/arm/cpu/armv7/sunxi/psci_sun6i.S
@@ -21,6 +21,7 @@
#include <asm/arch-armv7/generictimer.h>
#include <asm/gic.h>
+#include <linux/linkage.h>
#include <asm/macro.h>
#include <asm/psci.h>
#include <asm/arch/cpu.h>
@@ -45,6 +46,16 @@
#define GICD_BASE 0x1c81000
#define GICC_BASE 0x1c82000
+@ Attempts to condense sparse ID space on multi-cluster systems to dense ID space
+ENTRY(psci_get_cpu_id)
+ mrc p15, 0, r0, c0, c0, 5 /* read MPIDR */
+ lsr r1, r0, #6 /* extract cluster offset */
+ and r1, r1, #0xff
+ and r0, r0, #0xff /* extract CPU ID in cluster */
+ add r0, r0, r1 /* return adjusted CPU ID */
+ bx lr
+ENDPROC(psci_get_cpu_id)
+
.globl psci_fiq_enter
psci_fiq_enter:
push {r0-r12}
@@ -106,7 +117,7 @@ psci_fiq_enter:
str r10, [r8, #0x100]
timer_wait r10, ONE_MS
-#if defined(CONFIG_MACH_SUN6I) || defined(CONFIG_MACH_SUN8I_H3)
+#if defined(CONFIG_MACH_SUN6I) || defined(CONFIG_MACH_SUN8I_H3) || defined(CONFIG_MACH_SUN8I_A83T)
@ Activate power clamp
lsl r12, r9, #2 @ x4
add r12, r12, r8
@@ -134,7 +145,13 @@ out: mcr p15, 0, r7, c1, c1, 0
psci_cpu_on:
push {lr}
- mov r0, r1
+#if defined(CONFIG_MACH_SUN8I_A83T)
+ lsr r3, r1, #6 @ extract cluster offset
+ and r0, r1, #3 @ extract CPU number
+ add r0, r0, r3 @ pass adjusted CPU number to setup
+#else
+ mov r0, r1 @ pass CPU number to setup
+#endif
bl psci_get_cpu_stack_top @ get stack top of target CPU
str r2, [r0] @ store target PC at stack top
dsb
@@ -142,15 +159,74 @@ psci_cpu_on:
movw r0, #(SUN6I_CPUCFG_BASE & 0xffff)
movt r0, #(SUN6I_CPUCFG_BASE >> 16)
+ ldr r6, =psci_cpu_entry
+ str r6, [r0, #0x1a4] @ PRIVATE_REG (boot vector)
+
@ CPU mask
+#if defined(CONFIG_MACH_SUN8I_A83T)
+ lsr r3, r1, #8 @ extract cluster number
+ and r1, r1, #3 @ extract CPU number
+
+ @ obtain silicon revision level
+ movw r0, #(SUNXI_SRAMC_BASE & 0xffff)
+ movt r0, #(SUNXI_SRAMC_BASE >> 16)
+ ldr r2, [r0, #0x24]
+ and r2, r2, #0x1
+#else
+ ldr r3, #0 @ only one cluster
and r1, r1, #3 @ only care about first cluster
+ ldr r2, #0 @ default revision
+#endif
mov r4, #1
lsl r4, r4, r1
- ldr r6, =psci_cpu_entry
- str r6, [r0, #0x1a4] @ PRIVATE_REG (boot vector)
-
@ Assert reset on target CPU
+#if defined(CONFIG_MACH_SUN8I_A83T)
+ movw r0, #(SUN8I_CPUXCFG_BASE & 0xffff)
+ movt r0, #(SUN8I_CPUXCFG_BASE >> 16)
+
+ lsl r5, r3, #2 @ cluster offset
+ add r5, r5, #0x80 @ SUNXI_CPU_RST_CTRL
+ ldr r6, [r0, r5]
+ bic r6, r6, r4 @ assert reset
+ str r6, [r0, r5]
+
+ cmp r1, #0
+ bne skip_cluster_reset_assert
+
+ lsl r5, r3, #4 @ cluster offset
+ add r5, r5, #0x04 @ SUNXI_CLUSTER_CTRL1
+ ldr r6, [r0, r5]
+ orr r6, r6, #0x1 @ assert ACINACTM
+ str r6, [r0, r5]
+
+ lsl r5, r3, #2 @ cluster offset
+ add r5, r5, #0x80 @ SUNXI_CPU_RST_CTRL
+ ldr r6, [r0, r5]
+ bic r6, r6, #0x1000 @ assert HRESET
+ bic r6, r6, #0x100 @ assert L2 cache reset
+ str r6, [r0, r5]
+skip_cluster_reset_assert:
+
+ @ re-calculate CPU control register address
+ movw r0, #(SUN6I_CPUCFG_BASE & 0xffff)
+ movt r0, #(SUN6I_CPUCFG_BASE >> 16)
+
+ lsl r5, r3, #2 @ cluster offset
+ add r5, r5, #0x30 @ SUNXI_CLUSTER_PWRON_RESET
+ ldr r6, [r0, r5]
+ bic r6, r6, r4 @ assert reset
+ str r6, [r0, r5]
+
+ movw r0, #(SUN8I_CPUXCFG_BASE & 0xffff)
+ movt r0, #(SUN8I_CPUXCFG_BASE >> 16)
+
+ @ l1 invalidate
+ lsl r5, r3, #4 @ calculate cluster offset
+ ldr r6, [r0, r5] @ CX_CTRL_REG0
+ bic r6, r6, r4
+ str r6, [r0, r5]
+#else
mov r6, #0
lsl r5, r1, #6 @ 64 bytes per CPU
add r5, r5, #0x40 @ Offset from base
@@ -166,32 +242,109 @@ psci_cpu_on:
ldr r6, [r0, #0x1e4] @ CPUCFG_DBG_CTL1_REG
bic r6, r6, r4
str r6, [r0, #0x1e4]
+#endif
movw r0, #(SUNXI_PRCM_BASE & 0xffff)
movt r0, #(SUNXI_PRCM_BASE >> 16)
-#if defined(CONFIG_MACH_SUN6I) || defined(CONFIG_MACH_SUN8I_H3)
+#if defined(CONFIG_MACH_SUN6I) || defined(CONFIG_MACH_SUN8I_H3) || defined(CONFIG_MACH_SUN8I_A83T)
@ Release power clamp
- lsl r5, r1, #2 @ 1 register per CPU
+ lsl r5, r3, #2 @ calculate cluster offset
+ add r5, r1 @ add CPU offset
+ lsl r5, r5, #2 @ 1 register per CPU
add r5, r5, r0 @ PRCM
+#if defined(CONFIG_MACH_SUN8I_A83T)
+ mov r6, #0xfe
+ str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
+ timer_wait r6, TEN_MS
+ timer_wait r6, TEN_MS
+ mov r6, #0xf8
+ str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
+ timer_wait r6, TEN_MS
+ mov r6, #0xe0
+ str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
+ timer_wait r6, TEN_MS
+ mov r6, #0xc0
+ str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
+ timer_wait r6, TEN_MS
+ mov r6, #0x80
+ str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
+ timer_wait r6, TEN_MS
+ mov r6, #0x00
+ str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
+ timer_wait r6, TEN_MS
+#else
movw r6, #0x1ff
movt r6, #0
1: lsrs r6, r6, #1
str r6, [r5, #0x140] @ CPUx_PWR_CLAMP
bne 1b
#endif
+#endif
timer_wait r6, TEN_MS
@ Clear power gating
- ldr r6, [r0, #0x100] @ CPU_PWROFF_GATING
- bic r6, r6, r4
- str r6, [r0, #0x100]
+ lsl r5, r3, #2 @ cluster offset
+ add r5, r5, #0x100 @ SUNXI_CLUSTER_PWROFF_GATING
+ ldr r6, [r0, r5]
+#if defined(CONFIG_MACH_SUN8I_A83T)
+ cmp r2, #0
+ beq skip_a83t_rev_b_fixup
+ cmp r1, #0
+ bne skip_a83t_rev_b_fixup
+ bic r6, r6, #0x10 @ core 0 power gate off
+ b a83t_rev_b_fixup_done
+#endif
+skip_a83t_rev_b_fixup:
+ bic r6, r6, r4 @ power gating off
+a83t_rev_b_fixup_done:
+ str r6, [r0, r5]
+
+ movw r0, #(SUN8I_CPUXCFG_BASE & 0xffff)
+ movt r0, #(SUN8I_CPUXCFG_BASE >> 16)
@ re-calculate CPU control register address
movw r0, #(SUN6I_CPUCFG_BASE & 0xffff)
movt r0, #(SUN6I_CPUCFG_BASE >> 16)
+#if defined(CONFIG_MACH_SUN8I_A83T)
+ timer_wait r6, TEN_MS
+ timer_wait r6, TEN_MS
+
+ @ Deassert reset on target CPU
+ lsl r5, r3, #2 @ cluster offset
+ add r5, r5, #0x30 @ SUNXI_CLUSTER_PWRON_RESET
+ ldr r6, [r0, r5]
+ orr r6, r6, r4 @ deassert reset
+ str r6, [r0, r5]
+
+ movw r0, #(SUN8I_CPUXCFG_BASE & 0xffff)
+ movt r0, #(SUN8I_CPUXCFG_BASE >> 16)
+
+ @ Clear any applied cluster resets
+ cmp r1, #0
+ bne skip_cluster_reset_deassert
+ lsl r5, r3, #2 @ cluster offset
+ add r5, r5, #0x80 @ SUNXI_CPU_RST_CTRL
+ ldr r6, [r0, r5]
+ orr r6, r6, #0x1000 @ deassert HRESET
+ orr r6, r6, #0x100 @ deassert L2 cache reset
+ str r6, [r0, r5]
+
+ lsl r5, r3, #4 @ cluster offset
+ add r5, r5, #0x04 @ SUNXI_CLUSTER_CTRL1
+ ldr r6, [r0, r5]
+ bic r6, r6, #0x1 @ deassert ACINACTM
+ str r6, [r0, r5]
+skip_cluster_reset_deassert:
+
+ lsl r5, r3, #2 @ cluster offset
+ add r5, r5, #0x80 @ SUNXI_CPU_RST_CTRL
+ ldr r6, [r0, r5]
+ orr r6, r6, r4 @ deassert reset
+ str r6, [r0, r5]
+#else
@ Deassert reset on target CPU
mov r6, #3
lsl r5, r1, #6 @ 64 bytes per CPU
@@ -203,6 +356,7 @@ psci_cpu_on:
ldr r6, [r0, #0x1e4] @ CPUCFG_DBG_CTL1_REG
orr r6, r6, r4
str r6, [r0, #0x1e4]
+#endif
mov r0, #ARM_PSCI_RET_SUCCESS @ Return PSCI_RET_SUCCESS
pop {pc}
--
2.8.0.rc3
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