arm: cpu: armv8: add L3 memory flush support

Add L3 memory flush support for NS3.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile
index 2e48df0eb981c418112af04c5cd4b7bbdac968d3..7e33a183d54b84f85f23a55037a178d36b464c20 100644 (file)
--- a/arch/arm/cpu/armv8/Makefile
+++ b/arch/arm/cpu/armv8/Makefile
@@ -39,3 +39,4 @@ obj-$(CONFIG_S32V234) += s32v234/
 obj-$(CONFIG_TARGET_HIKEY) += hisilicon/
 obj-$(CONFIG_ARMV8_PSCI) += psci.o
 obj-$(CONFIG_ARCH_SUNXI) += lowlevel_init.o
+obj-$(CONFIG_TARGET_BCMNS3) += bcmns3/

diff --git a/arch/arm/cpu/armv8/bcmns3/Makefile b/arch/arm/cpu/armv8/bcmns3/Makefile
new file mode 100644 (file)
index 0000000..a35e29d
--- /dev/null
+++ b/arch/arm/cpu/armv8/bcmns3/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright 2020 Broadcom.
+
+obj-y  += lowlevel.o

diff --git a/arch/arm/cpu/armv8/bcmns3/lowlevel.S b/arch/arm/cpu/armv8/bcmns3/lowlevel.S
new file mode 100644 (file)
index 0000000..6709c9a
--- /dev/null
+++ b/arch/arm/cpu/armv8/bcmns3/lowlevel.S
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Broadcom.
+ *
+ */
+
+#include <asm/macro.h>
+#include <linux/linkage.h>
+
+hnf_pstate_poll:
+       /* x0 has the desired status, return 0 for success, 1 for timeout
+        * clobber x1, x2, x3, x4, x6, x7
+        */
+       mov     x1, x0
+       mov     x7, #0                  /* flag for timeout */
+       mrs     x3, cntpct_el0          /* read timer */
+       mov     w0, #600
+       mov     w6, #1000
+       mul     w0, w0, w6
+       add     x3, x3, x0              /* timeout after 100 microseconds */
+       mov     x0, #0x18
+       movk    x0, #0x6120, lsl #16    /* HNF0_PSTATE_STATUS */
+       mov     w6, #4                  /* HN-F node count */
+1:
+       ldr     x2, [x0]
+       cmp     x2, x1                  /* check status */
+       b.eq    2f
+       mrs     x4, cntpct_el0
+       cmp     x4, x3
+       b.ls    1b
+       mov     x7, #1                  /* timeout */
+       b       3f
+2:
+       add     x0, x0, #0x10000        /* move to next node */
+       subs    w6, w6, #1
+       cbnz    w6, 1b
+3:
+       mov     x0, x7
+       ret
+
+hnf_set_pstate:
+       /* x0 has the desired state, clobber x1, x2, x6 */
+       mov     x1, x0
+       /* power state to SFONLY */
+       mov     w6, #4                  /* HN-F node count */
+       mov     x0, #0x10
+       movk x0, #0x6120, lsl #16               /* HNF0_PSTATE_REQ */
+1:     /* set pstate to sfonly */
+       ldr     x2, [x0]
+       and     x2, x2, #0xfffffffffffffffc     /* & HNFPSTAT_MASK */
+       orr     x2, x2, x1
+       str     x2, [x0]
+       add     x0, x0, #0x10000        /* move to next node */
+       subs    w6, w6, #1
+       cbnz    w6, 1b
+
+       ret
+
+ENTRY(__asm_flush_l3_dcache)
+       /*
+        * Return status in x0
+        *    success 0
+        *    timeout 1 for setting SFONLY, 2 for FAM, 3 for both
+        */
+       mov     x29, lr
+       mov     x8, #0
+
+       dsb     sy
+       mov     x0, #0x1                /* HNFPSTAT_SFONLY */
+       bl      hnf_set_pstate
+
+       mov     x0, #0x4                /* SFONLY status */
+       bl      hnf_pstate_poll
+       cbz     x0, 1f
+       mov     x8, #1                  /* timeout */
+1:
+       dsb     sy
+       mov     x0, #0x3                /* HNFPSTAT_FAM */
+       bl      hnf_set_pstate
+
+       mov     x0, #0xc                /* FAM status */
+       bl      hnf_pstate_poll
+       cbz     x0, 1f
+       add     x8, x8, #0x2
+1:
+       mov     x0, x8
+       mov     lr, x29
+       ret
+ENDPROC(__asm_flush_l3_dcache)