[RFC PATCH v3 17/37] kvx: Add boot and setup routines

ysionneau
2024-07-22T09:43:32Z

From: Yann Sionneau <ysionneau@kalrayinc.com>

Add basic boot, setup and reset routines for kvx.

Co-developed-by: Alex Michon <amichon@kalrayinc.com>
Signed-off-by: Alex Michon <amichon@kalrayinc.com>
Co-developed-by: Clement Leger <clement@clement-leger.fr>
Signed-off-by: Clement Leger <clement@clement-leger.fr>
Co-developed-by: Guillaume Missonnier <gmissonnier@kalrayinc.com>
Signed-off-by: Guillaume Missonnier <gmissonnier@kalrayinc.com>
Co-developed-by: Guillaume Thouvenin <thouveng@gmail.com>
Signed-off-by: Guillaume Thouvenin <thouveng@gmail.com>
Co-developed-by: Jules Maselbas <jmaselbas@zdiv.net>
Signed-off-by: Jules Maselbas <jmaselbas@zdiv.net>
Co-developed-by: Julian Vetter <jvetter@kalrayinc.com>
Signed-off-by: Julian Vetter <jvetter@kalrayinc.com>
Co-developed-by: Julien Hascoet <jhascoet@kalrayinc.com>
Signed-off-by: Julien Hascoet <jhascoet@kalrayinc.com>
Co-developed-by: Julien Villette <julien.villette@gmail.com>
Signed-off-by: Julien Villette <julien.villette@gmail.com>
Co-developed-by: Marc Poulhiès <dkm@kataplop.net>
Signed-off-by: Marc Poulhiès <dkm@kataplop.net>
Co-developed-by: Luc Michel <luc@lmichel.fr>
Signed-off-by: Luc Michel <luc@lmichel.fr>
Co-developed-by: Marius Gligor <mgligor@kalrayinc.com>
Signed-off-by: Marius Gligor <mgligor@kalrayinc.com>
Signed-off-by: Yann Sionneau <ysionneau@kalrayinc.com>
---

Notes:
V1 -> V2: removed L2 cache firmware starting code

V2 -> V3:
- increase watchdog timeout from 30s to 120s
- memory mapping:
- add SMEM to direct map at VA 0xFFFFFF8000000000
- DDR starts at VA 0xFFFFFF8100000000 (prev. 0xFFFFFF8000000000)
- add a 2 MB mapping for smem direct map
- smem identity mapping now use global addr. (prev. cluster local)
- assembly syntax changes
- switch from ENTRY/ENDPROC macros to SYM_FUNC_{START,END}
- macro renaming
- replace strtobool with kstrtobool
- add CONFIG_SMP guarding around smp_init_cpus()
- add missing static qualifier
---
arch/kvx/include/asm/setup.h | 34 ++
arch/kvx/kernel/common.c | 11 +
arch/kvx/kernel/head.S | 580 +++++++++++++++++++++++++++++++++++
arch/kvx/kernel/prom.c | 26 ++
arch/kvx/kernel/reset.c | 37 +++
arch/kvx/kernel/setup.c | 181 +++++++++++
arch/kvx/kernel/time.c | 242 +++++++++++++++
7 files changed, 1111 insertions(+)
create mode 100644 arch/kvx/include/asm/setup.h
create mode 100644 arch/kvx/kernel/common.c
create mode 100644 arch/kvx/kernel/head.S
create mode 100644 arch/kvx/kernel/prom.c
create mode 100644 arch/kvx/kernel/reset.c
create mode 100644 arch/kvx/kernel/setup.c
create mode 100644 arch/kvx/kernel/time.c

diff --git a/arch/kvx/include/asm/setup.h b/arch/kvx/include/asm/setup.h
new file mode 100644
index 0000000000000..c522ce2fe8adf
--- /dev/null
+++ b/arch/kvx/include/asm/setup.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ */
+
+#ifndef _ASM_KVX_SETUP_H
+#define _ASM_KVX_SETUP_H
+
+#include <linux/const.h>
+
+#include <asm-generic/setup.h>
+
+/* Magic is found in r0 when some parameters are given to kernel */
+#define LINUX_BOOT_PARAM_MAGIC ULL(0x31564752414E494C)
+
+#ifndef __ASSEMBLY__
+
+void early_fixmap_init(void);
+
+void setup_device_tree(void);
+
+void setup_arch_memory(void);
+
+void kvx_init_mmu(void);
+
+void setup_processor(void);
+
+asmlinkage __visible void __init arch_low_level_start(unsigned long r0,
+ void *dtb_ptr);
+
+#endif
+
+#endif /* _ASM_KVX_SETUP_H */
diff --git a/arch/kvx/kernel/common.c b/arch/kvx/kernel/common.c
new file mode 100644
index 0000000000000..322498f034fd9
--- /dev/null
+++ b/arch/kvx/kernel/common.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ */
+
+#include <linux/percpu-defs.h>
+#include <linux/sched/task.h>
+
+DEFINE_PER_CPU(int, __preempt_count) = INIT_PREEMPT_COUNT;
+EXPORT_PER_CPU_SYMBOL(__preempt_count);
diff --git a/arch/kvx/kernel/head.S b/arch/kvx/kernel/head.S
new file mode 100644
index 0000000000000..cd6b990fcb01e
--- /dev/null
+++ b/arch/kvx/kernel/head.S
@@ -0,0 +1,580 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ * Guillaume Thouvenin
+ * Marius Gligor
+ * Julian Vetter
+ * Julien Hascoet
+ * Yann Sionneau
+ * Marc Poulhiès
+ */
+#include <asm/thread_info.h>
+#include <asm/page_size.h>
+#include <asm/pwr_ctrl.h>
+#include <asm/sfr_defs.h>
+#include <asm/sys_arch.h>
+#include <asm/privilege.h>
+#include <asm/tlb_defs.h>
+#include <asm/mem_map.h>
+#include <asm/setup.h>
+#include <asm/page.h>
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+#ifdef CONFIG_SMP
+#define SECONDARY_START_ADDR smp_secondary_start
+#else
+#define SECONDARY_START_ADDR proc_power_off
+#endif
+
+#define PS_VAL_WFXL(__field, __val) \
+ SFR_SET_VAL_WFXL(PS, __field, __val)
+
+#define PS_WFXL_VALUE PS_VAL_WFXL(HLE, 1) | \
+ PS_VAL_WFXL(USE, 1) | \
+ PS_VAL_WFXL(DCE, 1) | \
+ PS_VAL_WFXL(ICE, 1) | \
+ PS_VAL_WFXL(MME, 1) | \
+ PS_VAL_WFXL(MMUP, 1) | \
+ PS_VAL_WFXL(ET, 0) | \
+ PS_VAL_WFXL(HTD, 0) | \
+ PS_VAL_WFXL(V64, 1) | \
+ PS_VAL_WFXL(PMJ, KVX_SUPPORTED_PSIZE)
+
+#define PCR_VAL_WFXM(__field, __val) \
+ SFR_SET_VAL_WFXM(PCR, __field, __val)
+
+#define PCR_WFXM_VALUE PCR_VAL_WFXM(L1CE, 1)
+
+/* 120 sec for primary watchdog timeout */
+#define PRIMARY_WATCHDOG_VALUE (120000000000UL)
+
+#define TCR_WFXL_VALUE SFR_SET_VAL_WFXL(TCR, WUI, 1) | \
+ SFR_SET_VAL_WFXL(TCR, WCE, 1)
+
+/* Enable STOP in WS */
+#define WS_ENABLE_WU2 (KVX_SFR_WS_WU2_MASK)
+/* We only want to clear bits in ws */
+#define WS_WFXL_VALUE (WS_ENABLE_WU2)
+
+/* SMP stuff */
+#define KVX_RM_ID 16
+#define RM_PID_MASK ((KVX_RM_ID) << KVX_SFR_PCR_PID_SHIFT)
+
+/* Clean error and selected buffer */
+#define MMC_CLEAR_ERROR (KVX_SFR_MMC_E_MASK)
+
+#define TEH_VIRTUAL_MEMORY \
+ TLB_MK_TEH_ENTRY(DDR_VIRT_OFFSET, 0, TLB_G_GLOBAL, 0)
+
+#define TEL_VIRTUAL_MEMORY \
+ TLB_MK_TEL_ENTRY(DDR_PHYS_OFFSET, TLB_PS_512M, TLB_ES_A_MODIFIED,\
+ TLB_CP_W_C, TLB_PA_NA_RWX)
+
+/* (TEH|TEL)_SHARED_MEMORY are mapping 0x0 to 0x0 */
+#define TEH_SHARED_MEMORY \
+ TLB_MK_TEH_ENTRY(0x1000000, 0, TLB_G_GLOBAL, 0)
+
+#define TEL_SHARED_MEMORY \
+ TLB_MK_TEL_ENTRY(0x1000000, TLB_PS_2M, TLB_ES_A_MODIFIED,\
+ TLB_CP_W_C, TLB_PA_NA_RWX)
+
+#define TEH_VIRTUAL_SMEM \
+ TLB_MK_TEH_ENTRY(0 + PAGE_OFFSET, 0, TLB_G_GLOBAL, 0)
+
+#define TEL_VIRTUAL_SMEM \
+ TLB_MK_TEL_ENTRY(0x1000000, TLB_PS_2M, TLB_ES_A_MODIFIED,\
+ TLB_CP_W_C, TLB_PA_NA_RWX)
+
+#define TEH_GDB_PAGE_MEMORY \
+ TLB_MK_TEH_ENTRY(0, 0, TLB_G_GLOBAL, 0)
+
+#define TEL_GDB_PAGE_MEMORY \
+ TLB_MK_TEL_ENTRY(0, TLB_PS_4K, TLB_ES_A_MODIFIED,\
+ TLB_CP_U_U, TLB_PA_RWX_RWX)
+
+/**
+ * Macros
+ */
+.altmacro
+
+/* To select the JTLB we clear SB from MMC */
+.macro select_jtlb scratch_reg
+ make \scratch_reg = KVX_SFR_MMC_SB_MASK
+ ;;
+ wfxl $mmc, \scratch_reg
+.endm
+
+/* To select the LTLB we set SB from MMC */
+.macro select_ltlb scratch_reg
+ make \scratch_reg = KVX_SFR_MMC_SB_MASK << 32
+ ;;
+ wfxl $mmc, \scratch_reg
+.endm
+
+/* Set SW of the MMC with number found in the reg register */
+.macro select_way_from_register reg scratch1 scratch2
+ slld \scratch1 = \reg, KVX_SFR_MMC_SW_SHIFT
+ make \scratch2 = KVX_SFR_MMC_SW_MASK
+ ;;
+ slld \scratch1 = \scratch1, 32
+ ;;
+ ord \scratch1 = \scratch1, \scratch2
+ ;;
+ wfxl $mmc, \scratch1
+.endm
+
+/* Set SW of the MMC with the immediate */
+.macro select_way_from_immediate imm scratch1 scratch2
+ make \scratch1 = (\imm << KVX_SFR_MMC_SW_SHIFT) << 32
+ make \scratch2 = KVX_SFR_MMC_SW_MASK
+ ;;
+ ord \scratch1 = \scratch1, \scratch2
+ ;;
+ wfxl $mmc, \scratch1
+.endm
+
+/* write tlb after setting teh and tel registers */
+.macro write_tlb_entry teh tel
+ set $teh = \teh
+ ;;
+ set $tel = \tel
+ ;;
+ tlbwrite
+.endm
+
+/* Boot args */
+#define BOOT_ARGS_COUNT 2
+.align 16
+.section .boot.data, "aw", @progbits
+rm_boot_args:
+.skip BOOT_ARGS_COUNT * 8
+
+/*
+ * This is our entry point. When entering from bootloader,
+ * the following registers are set:
+ * $r0 is a magic (LINUX_BOOT_PARAM_MAGIC)
+ * $r1 device tree pointer
+ *
+ * WARNING WARNING WARNING
+ * ! DO NOT CLOBBER THEM !
+ * WARNING WARNING WARNING
+ *
+ * Try to use register above $r20 to ease parameter adding in future
+ */
+
+__HEAD
+
+.align 8
+.section .boot.startup, "ax", @progbits
+SYM_FUNC_START(kvx_start)
+ /* Setup 64 bit really early to avoid bugs */
+ make $r21 = PS_VAL_WFXL(V64, 1)
+ ;;
+ wfxl $ps, $r21
+ ;;
+ call asm_init_pl
+ ;;
+ get $r20 = $pcr
+ ;;
+ andd $r21 = $r20, RM_PID_MASK
+ ;;
+ cb.dnez $r21 ? asm_rm_cfg_pwr_ctrl
+ ;;
+init_core:
+ call asm_init_mmu
+ ;;
+ /* Setup default processor status */
+ make $r25 = PS_WFXL_VALUE
+ make $r26 = PCR_WFXM_VALUE
+ ;;
+ /**
+ * There is nothing much we can do if we take a early trap since the
+ * kernel is not yet ready to handle them.
+ * Register this as the early exception handler to at least avoid
+ * going in a black hole.
+ */
+ make $r27 = __early_exception_start
+ ;;
+ set $ev = $r27
+ make $r27 = gdb_mmu_enabled
+ ;;
+ wfxm $pcr, $r26
+ ;;
+ wfxl $sps, $r25
+ ;;
+ set $spc = $r27
+ ;;
+ fence /* Ensure there is no outstanding load/store before dcache enable */
+ ;;
+ rfe /* return into a virtual memory world */
+ ;;
+
+ /* gdb_mmu_enable is a label to easily install a breakpoint once the
+ * mmu is enabled and virtual addresses of kernel text can be accessed
+ * by gdb. See Documentation/kvx/kvx.txt for more details. */
+gdb_mmu_enabled:
+ i1inval
+ ;;
+ barrier
+ ;;
+ d1inval
+ ;;
+ /* Extract processor identifier */
+ get $r24 = $pcr
+ ;;
+ extfz $r24 = $r24, KVX_SFR_END(PCR_PID), KVX_SFR_START(PCR_PID)
+ ;;
+ /* If proc 0, then go to clear bss and do normal boot */
+ cb.deqz $r24? clear_bss
+ make $r25 = SECONDARY_START_ADDR
+ ;;
+ icall $r25
+ ;;
+clear_bss:
+ /* Copy bootloader arguments before cloberring them */
+ copyd $r20 = $r0
+ copyd $r21 = $r1
+ ;;
+ /* Clear BSS */
+ make $r0 = __bss_start
+ make $r1 = __bss_stop
+ call asm_memzero
+ ;;
+ /* Setup stack */
+ make $r40 = init_thread_union
+ make $r41 = init_task
+ ;;
+ set $sr = $r41
+ copyd $r0 = $r20
+ copyd $r1 = $r21
+ ;;
+ addd $sp = $r40, THREAD_SIZE
+ /* Clear frame pointer */
+ make $fp = 0x0
+ /* Setup the exception handler */
+ make $r27 = __exception_start
+ ;;
+ set $ev = $r27
+ /* Here we go ! start the C stuff */
+ make $r20 = arch_low_level_start
+ ;;
+ icall $r20
+ ;;
+ make $r20 = proc_power_off
+ ;;
+ igoto $r20
+ ;;
+SYM_FUNC_END(kvx_start)
+
+/**
+ * When PE 0 is started from the RM, arguments from the bootloaders are copied
+ * into rm_boot_args. It allows to give parameters from RM to PE.
+ * Note that the 4K alignment is required by the reset pc register...
+ */
+.align (4 * 1024)
+SYM_FUNC_START(pe_start_wrapper)
+ make $r0 = rm_boot_args
+ make $r27 = PWR_CTRL_ADDR
+ make $r28 = kvx_start
+ ;;
+ lq $r0r1 = 0[$r0]
+ ;;
+ /* Set reset PC back to original value for SMP start */
+ sd KVX_PWR_CTRL_RESET_PC_OFFSET[$r27] = $r28
+ ;;
+ fence
+ goto kvx_start
+ ;;
+SYM_FUNC_END(pe_start_wrapper)
+
+/**
+ * asm_memzero - Clear a memory zone with zeroes
+ * $r0 is the start of memory zone (must be align on 32 bytes boundary)
+ * $r1 is the end of memory zone (must be align on 32 bytes boundary)
+ */
+SYM_FUNC_START(asm_memzero)
+ sbfd $r32 = $r0, $r1
+ make $r36 = 0
+ make $r37 = 0
+ ;;
+ make $r38 = 0
+ make $r39 = 0
+ /* Divide by 32 for hardware loop */
+ srld $r32 = $r32, 5
+ ;;
+ /* Clear memory with hardware loop */
+ loopdo $r32, clear_mem_done
+ ;;
+ so 0[$r0] = $r36r37r38r39
+ addd $r0 = $r0, 32
+ ;;
+ clear_mem_done:
+ ret
+ ;;
+SYM_FUNC_END(asm_memzero)
+
+/**
+ * Configure the power controller to be accessible by PEs
+ */
+SYM_FUNC_START(asm_rm_cfg_pwr_ctrl)
+ /* Enable hwloop for memzero */
+ make $r32 = PS_VAL_WFXL(HLE, 1)
+ ;;
+ wfxl $ps, $r32
+ ;;
+ make $r26 = PWR_CTRL_ADDR
+ make $r27 = PWR_CTRL_GLOBAL_CONFIG_PE_EN
+ ;;
+ /* Set PE enable in power controller */
+ sd PWR_CTRL_GLOBAL_CONFIG_SET_OFFSET[$r26] = $r27
+ make $r28 = rm_boot_args
+ ;;
+ /* Store parameters (r0:magic, r1:DTB) for PE0 */
+ sq 0[$r28] = $r0r1
+ make $r29 = pe_start_wrapper
+ ;;
+ /* Set PE reset PC to arguments wrapper */
+ sd KVX_PWR_CTRL_RESET_PC_OFFSET[$r26] = $r29
+ ;;
+ /* make sure parameters are visible by PE 0 */
+ fence
+ ;;
+ /* Start PE 0 (1 << cpu) */
+ make $r27 = 1
+ make $r26 = PWR_CTRL_ADDR
+ ;;
+ /* Wake up PE0 */
+ sd PWR_CTRL_WUP_SET_OFFSET[$r26] = $r27
+ ;;
+ /* And clear wakeup to allow PE0 to sleep */
+ sd PWR_CTRL_WUP_CLEAR_OFFSET[$r26] = $r27
+ ;;
+ /* Nothing left to do on RM here */
+ goto proc_power_off
+ ;;
+SYM_FUNC_END(asm_rm_cfg_pwr_ctrl)
+
+#define request_ownership(__pl) ;\
+ make $r21 = SYO_WFXL_VALUE_##__pl ;\
+ ;; ;\
+ wfxl $syow, $r21 ;\
+ ;; ;\
+ make $r21 = HTO_WFXL_VALUE_##__pl ;\
+ ;; ;\
+ wfxl $htow, $r21 ;\
+ ;; ;\
+ make $r21 = MO_WFXL_VALUE_##__pl ;\
+ make $r22 = MO_WFXM_VALUE_##__pl ;\
+ ;; ;\
+ wfxl $mow, $r21 ;\
+ ;; ;\
+ wfxm $mow, $r22 ;\
+ ;; ;\
+ make $r21 = ITO_WFXL_VALUE_##__pl ;\
+ make $r22 = ITO_WFXM_VALUE_##__pl ;\
+ ;; ;\
+ wfxl $itow, $r21 ;\
+ ;; ;\
+ wfxm $itow, $r22 ;\
+ ;; ;\
+ make $r21 = PSO_WFXL_VALUE_##__pl ;\
+ make $r22 = PSO_WFXM_VALUE_##__pl ;\
+ ;; ;\
+ wfxl $psow, $r21 ;\
+ ;; ;\
+ wfxm $psow, $r22 ;\
+ ;; ;\
+ make $r21 = DO_WFXL_VALUE_##__pl ;\
+ ;; ;\
+ wfxl $dow, $r21 ;\
+ ;;
+
+/**
+ * Initialize privilege level for Kernel
+ */
+SYM_FUNC_START(asm_init_pl)
+ get $r21 = $ps
+ ;;
+ /* Extract privilege level from $ps to check if we need to
+ * lower our privilege level
+ */
+ extfz $r20 = $r21, KVX_SFR_END(PS_PL), KVX_SFR_START(PS_PL)
+ ;;
+ /* If our privilege level is 0, then we need to lower in execution level
+ * to ring 1 in order to let the debug routines be inserted at runtime
+ * by the JTAG. In both case, we will request the resources we need for
+ * linux to run.
+ */
+ cb.deqz $r20? delegate_pl
+ ;;
+ /*
+ * When someone is already above us, request the resources we need to
+ * run the kernel. No need to request double exception or ECC traps for
+ * instance. When doing so, the more privileged level will trap for
+ * permission and delegate us the required resources.
+ */
+ request_ownership(PL_CUR)
+ ;;
+ ret
+ ;;
+delegate_pl:
+ request_ownership(PL_CUR_PLUS_1)
+ ;;
+ /* Copy our $ps into $sps for 1:1 restoration */
+ get $r22 = $ps
+ ;;
+ /* We will return to $ra after rfe */
+ get $r21 = $ra
+ /* Set privilege level to +1 is $sps */
+ addd $r22 = $r22, PL_CUR_PLUS_1
+ ;;
+ set $spc = $r21
+ ;;
+ set $sps = $r22
+ ;;
+ rfe
+ ;;
+SYM_FUNC_END(asm_init_pl)
+
+/**
+ * Reset and initialize minimal tlb entries
+ */
+SYM_FUNC_START(asm_init_mmu)
+ make $r20 = MMC_CLEAR_ERROR
+ ;;
+ wfxl $mmc, $r20
+ ;;
+ /* Reset the JTLB */
+ select_jtlb $r20
+ ;;
+ make $r20 = (MMU_JTLB_SETS - 1) /* Used to select the set */
+ make $r21 = 0 /* Used for shifting and as scratch register */
+ ;;
+ set $tel = $r21 /* tel is always equal to 0 */
+ ;;
+ clear_jtlb:
+ slld $r21 = $r20, KVX_SFR_TEH_PN_SHIFT
+ addd $r20 = $r20, -1
+ ;;
+ set $teh = $r21
+ ;;
+ make $r22 = (MMU_JTLB_WAYS - 1) /* Used to select the way */
+ ;;
+ loop_jtlb_way:
+ select_way_from_register $r22 $r23 $r24
+ ;;
+ tlbwrite
+ ;;
+ addd $r22 = $r22, -1
+ ;;
+ cb.dgez $r22? loop_jtlb_way
+ ;;
+ /* loop_jtlb_way done */
+ cb.dgez $r20? clear_jtlb
+ ;;
+ clear_jtlb_done:
+ /* Reset the LTLB */
+ select_ltlb $r20
+ ;;
+ clear_ltlb:
+ /* There is only one set that is 0 so we can reuse the same
+ values for TEH and TEL. */
+ make $r20 = (MMU_LTLB_WAYS - 1)
+ ;;
+ loop_ltlb_way:
+ select_way_from_register $r20, $r21, $r22
+ ;;
+ tlbwrite
+ ;;
+ addd $r20 = $r20, -1
+ ;;
+ cb.dgez $r20? loop_ltlb_way
+ ;;
+ clear_ltlb_done:
+
+ /* See Documentation/kvx/kvx.txt for details about the settings of
+ the LTLB */
+ select_way_from_immediate LTLB_ENTRY_KERNEL_TEXT, $r20, $r21
+ ;;
+ make $r20 = TEH_VIRTUAL_MEMORY
+ make $r21 = TEL_VIRTUAL_MEMORY
+ ;;
+ write_tlb_entry $r20, $r21
+ ;;
+ select_way_from_immediate LTLB_ENTRY_EARLY_SMEM, $r20, $r21
+ ;;
+ make $r20 = TEH_SHARED_MEMORY
+ make $r21 = TEL_SHARED_MEMORY
+ ;;
+ write_tlb_entry $r20, $r21
+ ;;
+ select_way_from_immediate LTLB_ENTRY_VIRTUAL_SMEM, $r20, $r21
+ ;;
+ make $r20 = TEH_VIRTUAL_SMEM
+ make $r21 = TEL_VIRTUAL_SMEM
+ ;;
+ write_tlb_entry $r20, $r21
+ ;;
+ select_way_from_immediate LTLB_ENTRY_GDB_PAGE, $r20, $r21
+ ;;
+ make $r20 = _debug_start_lma
+ make $r21 = _debug_start
+ ;;
+ andd $r20 = $r20, KVX_SFR_TEH_PN_MASK
+ andd $r21 = $r21, KVX_SFR_TEL_FN_MASK
+ ;;
+ addd $r20 = $r20, TEH_GDB_PAGE_MEMORY
+ addd $r21 = $r21, TEL_GDB_PAGE_MEMORY
+ ;;
+ write_tlb_entry $r20, $r21
+ ;;
+ ret
+ ;;
+SYM_FUNC_END(asm_init_mmu)
+
+/**
+ * Entry point for secondary processors
+ * $r24 has been set in caller and is the proc id
+ */
+SYM_FUNC_START(smp_secondary_start)
+#ifdef CONFIG_SMP
+ d1inval
+ ;;
+ i1inval
+ ;;
+ barrier
+ ;;
+ make $r25 = __cpu_up_task_pointer
+ make $r26 = __cpu_up_stack_pointer
+ ;;
+ ld.xs $sp = $r24[$r26]
+ /* Clear frame pointer */
+ make $fp = 0x0
+ ;;
+ ld.xs $r25 = $r24[$r25]
+ ;;
+ set $sr = $r25
+ make $r27 = __exception_start
+ ;;
+ set $ev = $r27
+ make $r26 = start_kernel_secondary
+ ;;
+ icall $r26
+ ;;
+#endif
+SYM_FUNC_END(smp_secondary_start)
+
+SYM_FUNC_START(proc_power_off)
+ make $r1 = WS_WFXL_VALUE
+ ;;
+ /* Enable STOP */
+ wfxl $ws, $r1
+ ;;
+1: stop
+ ;;
+ goto 1b
+ ;;
+SYM_FUNC_END(proc_power_off)
diff --git a/arch/kvx/kernel/prom.c b/arch/kvx/kernel/prom.c
new file mode 100644
index 0000000000000..ec142565aef8e
--- /dev/null
+++ b/arch/kvx/kernel/prom.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ */
+
+#include <linux/of_platform.h>
+#include <linux/of_fdt.h>
+#include <linux/printk.h>
+#include <linux/init.h>
+
+#include <asm/setup.h>
+
+void __init setup_device_tree(void)
+{
+ const char *name;
+
+ name = of_flat_dt_get_machine_name();
+ if (!name)
+ return;
+
+ pr_info("Machine model: %s\n", name);
+ dump_stack_set_arch_desc("%s (DT)", name);
+
+ unflatten_device_tree();
+}
diff --git a/arch/kvx/kernel/reset.c b/arch/kvx/kernel/reset.c
new file mode 100644
index 0000000000000..afa0ceb9d7e9e
--- /dev/null
+++ b/arch/kvx/kernel/reset.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ */
+
+#include <linux/pm.h>
+#include <linux/reboot.h>
+
+#include <asm/processor.h>
+
+static void kvx_default_power_off(void)
+{
+ smp_send_stop();
+ local_cpu_stop();
+}
+
+void (*pm_power_off)(void) = kvx_default_power_off;
+EXPORT_SYMBOL(pm_power_off);
+
+void machine_restart(char *cmd)
+{
+ smp_send_stop();
+ do_kernel_restart(cmd);
+ pr_err("Reboot failed -- System halted\n");
+ local_cpu_stop();
+}
+
+void machine_halt(void)
+{
+ pm_power_off();
+}
+
+void machine_power_off(void)
+{
+ pm_power_off();
+}
diff --git a/arch/kvx/kernel/setup.c b/arch/kvx/kernel/setup.c
new file mode 100644
index 0000000000000..670e860665672
--- /dev/null
+++ b/arch/kvx/kernel/setup.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/start_kernel.h>
+#include <linux/screen_info.h>
+#include <linux/console.h>
+#include <linux/linkage.h>
+#include <linux/export.h>
+#include <linux/of_fdt.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+
+#include <asm/cpuinfo.h>
+#include <asm/processor.h>
+#include <asm/sections.h>
+#include <asm/hw_irq.h>
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/sfr.h>
+#include <asm/mmu.h>
+#include <asm/smp.h>
+
+struct screen_info screen_info;
+
+unsigned long memory_start;
+EXPORT_SYMBOL(memory_start);
+unsigned long memory_end;
+EXPORT_SYMBOL(memory_end);
+
+DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_kvx, cpu_info);
+EXPORT_PER_CPU_SYMBOL(cpu_info);
+
+static bool use_streaming = true;
+static int __init parse_kvx_streaming(char *arg)
+{
+ int ret;
+
+ ret = kstrtobool(arg, &use_streaming);
+
+ if (!use_streaming) {
+ pr_info("disabling streaming\n");
+ kvx_sfr_set_field(PS, USE, 0);
+ }
+
+ return ret;
+}
+early_param("kvx.streaming", parse_kvx_streaming);
+
+static void __init setup_user_privilege(void)
+{
+ /*
+ * We want to let the user control various fields of ps:
+ * - hardware loop
+ * - instruction cache enable
+ * - streaming enable
+ */
+ uint64_t mask = KVX_SFR_PSOW_HLE_MASK |
+ KVX_SFR_PSOW_ICE_MASK |
+ KVX_SFR_PSOW_USE_MASK;
+
+ uint64_t value = (1 << KVX_SFR_PSOW_HLE_SHIFT) |
+ (1 << KVX_SFR_PSOW_ICE_SHIFT) |
+ (1 << KVX_SFR_PSOW_USE_SHIFT);
+
+ kvx_sfr_set_mask(PSOW, mask, value);
+}
+
+void __init setup_cpuinfo(void)
+{
+ struct cpuinfo_kvx *n = this_cpu_ptr(&cpu_info);
+ u64 pcr = kvx_sfr_get(PCR);
+
+ n->copro_enable = kvx_sfr_field_val(pcr, PCR, COE);
+ n->arch_rev = kvx_sfr_field_val(pcr, PCR, CAR);
+ n->uarch_rev = kvx_sfr_field_val(pcr, PCR, CMA);
+}
+
+/*
+ * Everything that needs to be setup PER cpu should be put here.
+ * This function will be called by per-cpu setup routine.
+ */
+void __init setup_processor(void)
+{
+ /* Clear performance monitor 0 */
+ kvx_sfr_set_field(PMC, PM0C, 0);
+
+#ifdef CONFIG_ENABLE_TCA
+ /* Enable TCA (COE = Coprocessor Enable) */
+ kvx_sfr_set_field(PCR, COE, 1);
+#else
+ kvx_sfr_set_field(PCR, COE, 0);
+#endif
+
+ /*
+ * On kvx, we have speculative accesses which differ from normal
+ * accesses by the fact their trapping policy is directed by mmc.sne
+ * (speculative no-mapping enable) and mmc.spe (speculative protection
+ * enabled).
+ * To handle these accesses properly, we disable all traps on
+ * speculative accesses while in kernel and user (sne & spe)
+ * in order to silently discard data if fetched.
+ * This allows to do an effective prefetch.
+ */
+ kvx_sfr_set_field(MMC, SNE, 0);
+ kvx_sfr_set_field(MMC, SPE, 0);
+
+ if (!use_streaming)
+ kvx_sfr_set_field(PS, USE, 0);
+
+ kvx_init_core_irq();
+
+ setup_user_privilege();
+
+ setup_cpuinfo();
+}
+
+static char builtin_cmdline[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
+
+void __init setup_arch(char **cmdline_p)
+{
+ if (builtin_cmdline[0]) {
+ /* append boot loader cmdline to builtin */
+ strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
+ strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+ strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
+ }
+
+ *cmdline_p = boot_command_line;
+
+ setup_processor();
+
+ /* Jump labels needs fixmap to be setup for text modifications */
+ early_fixmap_init();
+
+ /* Parameters might set static keys */
+ jump_label_init();
+ /*
+ * Parse early param after setting up arch memory since
+ * we need fixmap for earlycon and fixedmap need to do
+ * memory allocation (fixed_range_init).
+ */
+ parse_early_param();
+
+ setup_arch_memory();
+
+ paging_init();
+
+ setup_device_tree();
+
+#ifdef CONFIG_SMP
+ smp_init_cpus();
+#endif
+
+#ifdef CONFIG_VT
+ conswitchp = &dummy_con;
+#endif
+}
+
+asmlinkage __visible void __init arch_low_level_start(unsigned long r0,
+ void *dtb_ptr)
+{
+ void *dt = __dtb_start;
+
+ kvx_mmu_early_setup();
+
+ if (r0 == LINUX_BOOT_PARAM_MAGIC)
+ dt = __va(dtb_ptr);
+
+ if (!early_init_dt_scan(dt))
+ panic("Missing device tree\n");
+
+ start_kernel();
+}
diff --git a/arch/kvx/kernel/time.c b/arch/kvx/kernel/time.c
new file mode 100644
index 0000000000000..e10c507d09849
--- /dev/null
+++ b/arch/kvx/kernel/time.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ * Yann Sionneau
+ * Guillaume Thouvenin
+ * Luc Michel
+ * Julian Vetter
+ */
+
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <linux/cpuhotplug.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/clk-provider.h>
+#include <linux/of_address.h>
+#include <linux/sched_clock.h>
+
+#include <asm/sfr_defs.h>
+
+#define KVX_TIMER_MIN_DELTA 1
+#define KVX_TIMER_MAX_DELTA 0xFFFFFFFFFFFFFFFFULL
+#define KVX_TIMER_MAX_VALUE 0xFFFFFFFFFFFFFFFFULL
+
+/*
+ * Clockevent
+ */
+static unsigned int kvx_timer_frequency;
+static unsigned int kvx_periodic_timer_value;
+static unsigned int kvx_timer_irq;
+
+static void kvx_timer_set_value(unsigned long value, unsigned long reload_value)
+{
+ kvx_sfr_set(T0R, reload_value);
+ kvx_sfr_set(T0V, value);
+ /* Enable timer */
+ kvx_sfr_set_field(TCR, T0CE, 1);
+}
+
+static int kvx_clkevent_set_next_event(unsigned long cycles,
+ struct clock_event_device *dev)
+{
+ /*
+ * Hardware does not support oneshot mode.
+ * In order to support it, set a really high reload value.
+ * Then, during the interrupt handler, disable the timer if
+ * in oneshot mode
+ */
+ kvx_timer_set_value(cycles - 1, KVX_TIMER_MAX_VALUE);
+
+ return 0;
+}
+
+/*
+ * Configure the rtc to periodically tick HZ times per second
+ */
+static int kvx_clkevent_set_state_periodic(struct clock_event_device *dev)
+{
+ kvx_timer_set_value(kvx_periodic_timer_value,
+ kvx_periodic_timer_value);
+
+ return 0;
+}
+
+static int kvx_clkevent_set_state_oneshot(struct clock_event_device *dev)
+{
+ /* Same as for kvx_clkevent_set_next_event */
+ kvx_clkevent_set_next_event(kvx_periodic_timer_value, dev);
+
+ return 0;
+}
+
+static int kvx_clkevent_set_state_shutdown(struct clock_event_device *dev)
+{
+ kvx_sfr_set_field(TCR, T0CE, 0);
+
+ return 0;
+}
+
+static DEFINE_PER_CPU(struct clock_event_device, kvx_clockevent_device) = {
+ .name = "kvx-timer-0",
+ .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
+ /* arbitrary rating for this clockevent */
+ .rating = 300,
+ .set_next_event = kvx_clkevent_set_next_event,
+ .set_state_periodic = kvx_clkevent_set_state_periodic,
+ .set_state_oneshot = kvx_clkevent_set_state_oneshot,
+ .set_state_shutdown = kvx_clkevent_set_state_shutdown,
+};
+
+static irqreturn_t kvx_timer_irq_handler(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = this_cpu_ptr(&kvx_clockevent_device);
+
+ /* Disable timer if in oneshot mode before reloading */
+ if (likely(clockevent_state_oneshot(evt)))
+ kvx_sfr_set_field(TCR, T0CE, 0);
+
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static int kvx_timer_starting_cpu(unsigned int cpu)
+{
+ struct clock_event_device *evt = this_cpu_ptr(&kvx_clockevent_device);
+
+ evt->cpumask = cpumask_of(cpu);
+ evt->irq = kvx_timer_irq;
+
+ clockevents_config_and_register(evt, kvx_timer_frequency,
+ KVX_TIMER_MIN_DELTA,
+ KVX_TIMER_MAX_DELTA);
+
+ /* Enable timer interrupt */
+ kvx_sfr_set_field(TCR, T0IE, 1);
+
+ enable_percpu_irq(kvx_timer_irq, IRQ_TYPE_NONE);
+
+ return 0;
+}
+
+static int kvx_timer_dying_cpu(unsigned int cpu)
+{
+ disable_percpu_irq(kvx_timer_irq);
+
+ return 0;
+}
+
+static int __init kvx_setup_core_timer(struct device_node *np)
+{
+ struct clock_event_device *evt = this_cpu_ptr(&kvx_clockevent_device);
+ struct clk *clk;
+ int err;
+
+ clk = of_clk_get(np, 0);
+ if (IS_ERR(clk)) {
+ pr_err("kvx_core_timer: Failed to get CPU clock: %ld\n",
+ PTR_ERR(clk));
+ return 1;
+ }
+
+ kvx_timer_frequency = clk_get_rate(clk);
+ clk_put(clk);
+ kvx_periodic_timer_value = kvx_timer_frequency / HZ;
+
+ kvx_timer_irq = irq_of_parse_and_map(np, 0);
+ if (!kvx_timer_irq) {
+ pr_err("kvx_core_timer: Failed to parse irq: %d\n",
+ kvx_timer_irq);
+ return -EINVAL;
+ }
+
+ err = request_percpu_irq(kvx_timer_irq, kvx_timer_irq_handler,
+ "kvx_core_timer", evt);
+ if (err) {
+ pr_err("kvx_core_timer: can't register interrupt %d (%d)\n",
+ kvx_timer_irq, err);
+ return err;
+ }
+
+ err = cpuhp_setup_state(CPUHP_AP_KVX_TIMER_STARTING,
+ "kvx/time:online",
+ kvx_timer_starting_cpu,
+ kvx_timer_dying_cpu);
+ if (err < 0) {
+ pr_err("kvx_core_timer: Failed to setup hotplug state");
+ return err;
+ }
+
+ return 0;
+}
+
+TIMER_OF_DECLARE(kvx_core_timer, "kalray,kv3-1-timer",
+ kvx_setup_core_timer);
+
+/*
+ * Clocksource
+ */
+static u64 kvx_dsu_clocksource_read(struct clocksource *cs)
+{
+ return readq(cs->archdata.regs);
+}
+
+static struct clocksource kvx_dsu_clocksource = {
+ .name = "kvx-dsu-clock",
+ .rating = 400,
+ .read = kvx_dsu_clocksource_read,
+ .mask = CLOCKSOURCE_MASK(64),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u64 notrace kvx_dsu_sched_read(void)
+{
+ return readq_relaxed(kvx_dsu_clocksource.archdata.regs);
+}
+
+static int __init kvx_setup_dsu_clock(struct device_node *np)
+{
+ int ret;
+ struct clk *clk;
+ unsigned long kvx_dsu_frequency;
+
+ kvx_dsu_clocksource.archdata.regs = of_iomap(np, 0);
+
+ WARN_ON(!kvx_dsu_clocksource.archdata.regs);
+ if (!kvx_dsu_clocksource.archdata.regs)
+ return -ENXIO;
+
+ clk = of_clk_get(np, 0);
+ if (IS_ERR(clk)) {
+ pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
+ return PTR_ERR(clk);
+ }
+
+ kvx_dsu_frequency = clk_get_rate(clk);
+ clk_put(clk);
+
+ ret = clocksource_register_hz(&kvx_dsu_clocksource,
+ kvx_dsu_frequency);
+ if (ret) {
+ pr_err("failed to register dsu clocksource");
+ return ret;
+ }
+
+ sched_clock_register(kvx_dsu_sched_read, 64, kvx_dsu_frequency);
+ return 0;
+}
+
+TIMER_OF_DECLARE(kvx_dsu_clock, "kalray,coolidge-dsu-clock",
+ kvx_setup_dsu_clock);
+
+void __init time_init(void)
+{
+ of_clk_init(NULL);
+
+ timer_probe();
+}
--
2.45.2