ARM: sunxi: Document registers in PSCI code
The PSCI CPU_ON code accesses quite a few registers. Document their names to make it easier to cross reference. Also explain "lock cpu" and "unlock cpu" as enabling/disabling debug access. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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1 changed files with 7 additions and 7 deletions
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@ -165,12 +165,12 @@ psci_cpu_on:
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str r6, [r5] @ Reset CPU
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str r6, [r5] @ Reset CPU
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@ l1 invalidate
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@ l1 invalidate
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ldr r6, [r0, #0x184]
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ldr r6, [r0, #0x184] @ CPUCFG_GEN_CTRL_REG
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bic r6, r6, r4
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bic r6, r6, r4
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str r6, [r0, #0x184]
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str r6, [r0, #0x184]
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@ Lock CPU
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@ Lock CPU (Disable external debug access)
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ldr r6, [r0, #0x1e4]
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ldr r6, [r0, #0x1e4] @ CPUCFG_DBG_CTL1_REG
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bic r6, r6, r4
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bic r6, r6, r4
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str r6, [r0, #0x1e4]
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str r6, [r0, #0x1e4]
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@ -178,13 +178,13 @@ psci_cpu_on:
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movw r6, #0x1ff
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movw r6, #0x1ff
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movt r6, #0
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movt r6, #0
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1: lsrs r6, r6, #1
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1: lsrs r6, r6, #1
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str r6, [r0, #0x1b0]
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str r6, [r0, #0x1b0] @ CPU1_PWR_CLAMP
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bne 1b
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bne 1b
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timer_wait r1, TEN_MS
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timer_wait r1, TEN_MS
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@ Clear power gating
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@ Clear power gating
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ldr r6, [r0, #0x1b4]
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ldr r6, [r0, #0x1b4] @ CPU1_PWROFF_REG
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bic r6, r6, #1
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bic r6, r6, #1
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str r6, [r0, #0x1b4]
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str r6, [r0, #0x1b4]
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@ -192,8 +192,8 @@ psci_cpu_on:
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mov r6, #3
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mov r6, #3
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str r6, [r5]
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str r6, [r5]
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@ Unlock CPU
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@ Unlock CPU (Enable external debug access)
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ldr r6, [r0, #0x1e4]
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ldr r6, [r0, #0x1e4] @ CPUCFG_DBG_CTL1_REG
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orr r6, r6, r4
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orr r6, r6, r4
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str r6, [r0, #0x1e4]
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str r6, [r0, #0x1e4]
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