[PATCH 08/15] powerpc: Add A2 cpu support
Michael Ellerman
michael at ozlabs.org
Fri Apr 15 18:32:01 EST 2011
From: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Add the cputable entry, regs and setup & restore entries for
the PPC A2.
Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Signed-off-by: Michael Ellerman <michael at ellerman.id.au>
---
arch/powerpc/include/asm/cputable.h | 6 +-
arch/powerpc/include/asm/reg_a2.h | 156 ++++++++++++++++++++++++++++++++
arch/powerpc/kernel/Makefile | 1 +
arch/powerpc/kernel/cpu_setup_a2.S | 114 +++++++++++++++++++++++
arch/powerpc/kernel/cputable.c | 25 +++++-
arch/powerpc/platforms/Kconfig.cputype | 4 +
6 files changed, 302 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 32a970d..0dd4266 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -438,6 +438,8 @@ extern const char *powerpc_base_platform;
#define CPU_FTRS_BASE_BOOK3E (CPU_FTR_USE_TB | CPU_FTR_PPCAS_ARCH_V2 | \
CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE)
+#define CPU_FTRS_A2 (CPU_FTRS_BASE_BOOK3E | CPU_FTR_SMT | CPU_FTR_DBELL)
+
#if defined(CONFIG_PPC_BOOK3S_64)
#define CPU_FTRS_POSSIBLE \
(CPU_FTRS_POWER3 | CPU_FTRS_RS64 | CPU_FTRS_POWER4 | \
@@ -446,7 +448,7 @@ extern const char *powerpc_base_platform;
CPU_FTR_1T_SEGMENT | CPU_FTR_VSX)
#elif defined(CONFIG_PPC_BOOK3E_64)
#define CPU_FTRS_POSSIBLE \
- (CPU_FTRS_BASE_BOOK3E)
+ (CPU_FTRS_BASE_BOOK3E | CPU_FTRS_A2)
#else
enum {
CPU_FTRS_POSSIBLE =
@@ -492,7 +494,7 @@ enum {
CPU_FTRS_POWER7 & CPU_FTRS_CELL & CPU_FTRS_PA6T & CPU_FTRS_POSSIBLE)
#elif defined(CONFIG_PPC_BOOK3E_64)
#define CPU_FTRS_ALWAYS \
- (CPU_FTRS_BASE_BOOK3E)
+ (CPU_FTRS_BASE_BOOK3E & CPU_FTRS_A2)
#else
enum {
CPU_FTRS_ALWAYS =
diff --git a/arch/powerpc/include/asm/reg_a2.h b/arch/powerpc/include/asm/reg_a2.h
new file mode 100644
index 0000000..3ba9c6f
--- /dev/null
+++ b/arch/powerpc/include/asm/reg_a2.h
@@ -0,0 +1,156 @@
+/*
+ * Register definitions specific to the A2 core
+ *
+ * Copyright (C) 2008 Ben. Herrenschmidt (benh at kernel.crashing.org), IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef __ASM_POWERPC_REG_A2_H__
+#define __ASM_POWERPC_REG_A2_H__
+
+#define SPRN_TENSR 0x1b5
+#define SPRN_TENS 0x1b6 /* Thread ENable Set */
+#define SPRN_TENC 0x1b7 /* Thread ENable Clear */
+
+#define SPRN_A2_CCR0 0x3f0 /* Core Configuration Register 0 */
+#define SPRN_A2_CCR1 0x3f1 /* Core Configuration Register 1 */
+#define SPRN_A2_CCR2 0x3f2 /* Core Configuration Register 2 */
+#define SPRN_MMUCR0 0x3fc /* MMU Control Register 0 */
+#define SPRN_MMUCR1 0x3fd /* MMU Control Register 1 */
+#define SPRN_MMUCR2 0x3fe /* MMU Control Register 2 */
+#define SPRN_MMUCR3 0x3ff /* MMU Control Register 3 */
+
+#define SPRN_IAR 0x372
+
+#define SPRN_IUCR0 0x3f3
+#define IUCR0_ICBI_ACK 0x1000
+
+#define SPRN_XUCR0 0x3f6 /* Execution Unit Config Register 0 */
+
+#define A2_IERAT_SIZE 16
+#define A2_DERAT_SIZE 32
+
+/* A2 MMUCR0 bits */
+#define MMUCR0_ECL 0x80000000 /* Extended Class for TLB fills */
+#define MMUCR0_TID_NZ 0x40000000 /* TID is non-zero */
+#define MMUCR0_TS 0x10000000 /* Translation space for TLB fills */
+#define MMUCR0_TGS 0x20000000 /* Guest space for TLB fills */
+#define MMUCR0_TLBSEL 0x0c000000 /* TLB or ERAT target for TLB fills */
+#define MMUCR0_TLBSEL_U 0x00000000 /* TLBSEL = UTLB */
+#define MMUCR0_TLBSEL_I 0x08000000 /* TLBSEL = I-ERAT */
+#define MMUCR0_TLBSEL_D 0x0c000000 /* TLBSEL = D-ERAT */
+#define MMUCR0_LOCKSRSH 0x02000000 /* Use TLB lock on tlbsx. */
+#define MMUCR0_TID_MASK 0x000000ff /* TID field */
+
+/* A2 MMUCR1 bits */
+#define MMUCR1_IRRE 0x80000000 /* I-ERAT round robin enable */
+#define MMUCR1_DRRE 0x40000000 /* D-ERAT round robin enable */
+#define MMUCR1_REE 0x20000000 /* Reference Exception Enable*/
+#define MMUCR1_CEE 0x10000000 /* Change exception enable */
+#define MMUCR1_CSINV_ALL 0x00000000 /* Inval ERAT on all CS evts */
+#define MMUCR1_CSINV_NISYNC 0x04000000 /* Inval ERAT on all ex isync*/
+#define MMUCR1_CSINV_NEVER 0x0c000000 /* Don't inval ERAT on CS */
+#define MMUCR1_ICTID 0x00080000 /* IERAT class field as TID */
+#define MMUCR1_ITTID 0x00040000 /* IERAT thdid field as TID */
+#define MMUCR1_DCTID 0x00020000 /* DERAT class field as TID */
+#define MMUCR1_DTTID 0x00010000 /* DERAT thdid field as TID */
+#define MMUCR1_DCCD 0x00008000 /* DERAT class ignore */
+#define MMUCR1_TLBWE_BINV 0x00004000 /* back invalidate on tlbwe */
+
+/* A2 MMUCR2 bits */
+#define MMUCR2_PSSEL_SHIFT 4
+
+/* A2 MMUCR3 bits */
+#define MMUCR3_THID 0x0000000f /* Thread ID */
+
+/* *** ERAT TLB bits definitions */
+#define TLB0_EPN_MASK ASM_CONST(0xfffffffffffff000)
+#define TLB0_CLASS_MASK ASM_CONST(0x0000000000000c00)
+#define TLB0_CLASS_00 ASM_CONST(0x0000000000000000)
+#define TLB0_CLASS_01 ASM_CONST(0x0000000000000400)
+#define TLB0_CLASS_10 ASM_CONST(0x0000000000000800)
+#define TLB0_CLASS_11 ASM_CONST(0x0000000000000c00)
+#define TLB0_V ASM_CONST(0x0000000000000200)
+#define TLB0_X ASM_CONST(0x0000000000000100)
+#define TLB0_SIZE_MASK ASM_CONST(0x00000000000000f0)
+#define TLB0_SIZE_4K ASM_CONST(0x0000000000000010)
+#define TLB0_SIZE_64K ASM_CONST(0x0000000000000030)
+#define TLB0_SIZE_1M ASM_CONST(0x0000000000000050)
+#define TLB0_SIZE_16M ASM_CONST(0x0000000000000070)
+#define TLB0_SIZE_1G ASM_CONST(0x00000000000000a0)
+#define TLB0_THDID_MASK ASM_CONST(0x000000000000000f)
+#define TLB0_THDID_0 ASM_CONST(0x0000000000000001)
+#define TLB0_THDID_1 ASM_CONST(0x0000000000000002)
+#define TLB0_THDID_2 ASM_CONST(0x0000000000000004)
+#define TLB0_THDID_3 ASM_CONST(0x0000000000000008)
+#define TLB0_THDID_ALL ASM_CONST(0x000000000000000f)
+
+#define TLB1_RESVATTR ASM_CONST(0x00f0000000000000)
+#define TLB1_U0 ASM_CONST(0x0008000000000000)
+#define TLB1_U1 ASM_CONST(0x0004000000000000)
+#define TLB1_U2 ASM_CONST(0x0002000000000000)
+#define TLB1_U3 ASM_CONST(0x0001000000000000)
+#define TLB1_R ASM_CONST(0x0000800000000000)
+#define TLB1_C ASM_CONST(0x0000400000000000)
+#define TLB1_RPN_MASK ASM_CONST(0x000003fffffff000)
+#define TLB1_W ASM_CONST(0x0000000000000800)
+#define TLB1_I ASM_CONST(0x0000000000000400)
+#define TLB1_M ASM_CONST(0x0000000000000200)
+#define TLB1_G ASM_CONST(0x0000000000000100)
+#define TLB1_E ASM_CONST(0x0000000000000080)
+#define TLB1_VF ASM_CONST(0x0000000000000040)
+#define TLB1_UX ASM_CONST(0x0000000000000020)
+#define TLB1_SX ASM_CONST(0x0000000000000010)
+#define TLB1_UW ASM_CONST(0x0000000000000008)
+#define TLB1_SW ASM_CONST(0x0000000000000004)
+#define TLB1_UR ASM_CONST(0x0000000000000002)
+#define TLB1_SR ASM_CONST(0x0000000000000001)
+
+/* A2 erativax attributes definitions */
+#define ERATIVAX_RS_IS_ALL 0x000
+#define ERATIVAX_RS_IS_TID 0x040
+#define ERATIVAX_RS_IS_CLASS 0x080
+#define ERATIVAX_RS_IS_FULLMATCH 0x0c0
+#define ERATIVAX_CLASS_00 0x000
+#define ERATIVAX_CLASS_01 0x010
+#define ERATIVAX_CLASS_10 0x020
+#define ERATIVAX_CLASS_11 0x030
+#define ERATIVAX_PSIZE_4K (TLB_PSIZE_4K >> 1)
+#define ERATIVAX_PSIZE_64K (TLB_PSIZE_64K >> 1)
+#define ERATIVAX_PSIZE_1M (TLB_PSIZE_1M >> 1)
+#define ERATIVAX_PSIZE_16M (TLB_PSIZE_16M >> 1)
+#define ERATIVAX_PSIZE_1G (TLB_PSIZE_1G >> 1)
+
+/* A2 eratilx attributes definitions */
+#define ERATILX_T_ALL 0
+#define ERATILX_T_TID 1
+#define ERATILX_T_TGS 2
+#define ERATILX_T_FULLMATCH 3
+#define ERATILX_T_CLASS0 4
+#define ERATILX_T_CLASS1 5
+#define ERATILX_T_CLASS2 6
+#define ERATILX_T_CLASS3 7
+
+/* XUCR0 bits */
+#define XUCR0_TRACE_UM_T0 0x40000000 /* Thread 0 */
+#define XUCR0_TRACE_UM_T1 0x20000000 /* Thread 1 */
+#define XUCR0_TRACE_UM_T2 0x10000000 /* Thread 2 */
+#define XUCR0_TRACE_UM_T3 0x08000000 /* Thread 3 */
+
+/* A2 CCR0 register */
+#define A2_CCR0_PME_DISABLED 0x00000000
+#define A2_CCR0_PME_SLEEP 0x40000000
+#define A2_CCR0_PME_RVW 0x80000000
+#define A2_CCR0_PME_DISABLED2 0xc0000000
+
+/* A2 CCR2 register */
+#define A2_CCR2_ERAT_ONLY_MODE 0x00000001
+#define A2_CCR2_ENABLE_ICSWX 0x00000002
+#define A2_CCR2_ENABLE_PC 0x20000000
+#define A2_CCR2_ENABLE_TRACE 0x40000000
+
+#endif /* __ASM_POWERPC_REG_A2_H__ */
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index b0ba78f..82e0bed 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_PPC_BOOK3S_64) += cpu_setup_ppc970.o cpu_setup_pa6t.o
obj-$(CONFIG_PPC_BOOK3S_64) += cpu_setup_power7.o
obj64-$(CONFIG_RELOCATABLE) += reloc_64.o
obj-$(CONFIG_PPC_BOOK3E_64) += exceptions-64e.o idle_book3e.o
+obj-$(CONFIG_PPC_A2) += cpu_setup_a2.o
obj-$(CONFIG_PPC64) += vdso64/
obj-$(CONFIG_ALTIVEC) += vecemu.o
obj-$(CONFIG_PPC_970_NAP) += idle_power4.o
diff --git a/arch/powerpc/kernel/cpu_setup_a2.S b/arch/powerpc/kernel/cpu_setup_a2.S
new file mode 100644
index 0000000..7f818fe
--- /dev/null
+++ b/arch/powerpc/kernel/cpu_setup_a2.S
@@ -0,0 +1,114 @@
+/*
+ * A2 specific assembly support code
+ *
+ * Copyright 2009 Ben Herrenschmidt, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/ppc_asm.h>
+#include <asm/ppc-opcode.h>
+#include <asm/processor.h>
+#include <asm/reg_a2.h>
+#include <asm/reg.h>
+#include <asm/thread_info.h>
+
+/*
+ * Disable thdid and class fields in ERATs to bump PID to full 14 bits capacity.
+ * This also prevents external LPID accesses but that isn't a problem when not a
+ * guest. Under PV, this setting will be ignored and MMUCR will return the right
+ * number of PID bits we can use.
+ */
+#define MMUCR1_EXTEND_PID \
+ (MMUCR1_ICTID | MMUCR1_ITTID | MMUCR1_DCTID | \
+ MMUCR1_DTTID | MMUCR1_DCCD)
+
+/*
+ * Use extended PIDs if enabled.
+ * Don't clear the ERATs on context sync events and enable I & D LRU.
+ * Enable ERAT back invalidate when tlbwe overwrites an entry.
+ */
+#define INITIAL_MMUCR1 \
+ (MMUCR1_EXTEND_PID | MMUCR1_CSINV_NEVER | MMUCR1_IRRE | \
+ MMUCR1_DRRE | MMUCR1_TLBWE_BINV)
+
+_GLOBAL(__setup_cpu_a2)
+ /* Some of these are actually thread local and some are
+ * core local but doing it always won't hurt
+ */
+
+#ifdef CONFIG_PPC_WSP_COPRO
+ /* Make sure ACOP starts out as zero */
+ li r3,0
+ mtspr SPRN_ACOP,r3
+
+ /* Enable icswx instruction */
+ mfspr r3,SPRN_A2_CCR2
+ ori r3,r3,A2_CCR2_ENABLE_ICSWX
+ mtspr SPRN_A2_CCR2,r3
+
+ /* Unmask all CTs in HACOP */
+ li r3,-1
+ mtspr SPRN_HACOP,r3
+#endif /* CONFIG_PPC_WSP_COPRO */
+
+ /* Enable doorbell */
+ mfspr r3,SPRN_A2_CCR2
+ oris r3,r3,A2_CCR2_ENABLE_PC at h
+ mtspr SPRN_A2_CCR2,r3
+ isync
+
+ /* Setup CCR0 to disable power saving for now as it's busted
+ * in the current implementations. Setup CCR1 to wake on
+ * interrupts normally (we write the default value but who
+ * knows what FW may have clobbered...)
+ */
+ li r3,0
+ mtspr SPRN_A2_CCR0, r3
+ LOAD_REG_IMMEDIATE(r3,0x0f0f0f0f)
+ mtspr SPRN_A2_CCR1, r3
+
+ /* Initialise MMUCR1 */
+ lis r3,INITIAL_MMUCR1 at h
+ ori r3,r3,INITIAL_MMUCR1 at l
+ mtspr SPRN_MMUCR1,r3
+
+ /* Set MMUCR2 to enable 4K, 64K, 1M, 16M and 1G pages */
+ LOAD_REG_IMMEDIATE(r3, 0x000a7531)
+ mtspr SPRN_MMUCR2,r3
+
+ /* Set MMUCR3 to write all thids bit to the TLB */
+ LOAD_REG_IMMEDIATE(r3, 0x0000000f)
+ mtspr SPRN_MMUCR3,r3
+
+ /* Don't do ERAT stuff if running guest mode */
+ mfmsr r3
+ andis. r0,r3,MSR_GS at h
+ bne 1f
+
+ /* Now set the I-ERAT watermark to 15 */
+ lis r4,(MMUCR0_TLBSEL_I|MMUCR0_ECL)@h
+ mtspr SPRN_MMUCR0, r4
+ li r4,A2_IERAT_SIZE-1
+ PPC_ERATWE(r4,r4,3)
+
+ /* Now set the D-ERAT watermark to 31 */
+ lis r4,(MMUCR0_TLBSEL_D|MMUCR0_ECL)@h
+ mtspr SPRN_MMUCR0, r4
+ li r4,A2_DERAT_SIZE-1
+ PPC_ERATWE(r4,r4,3)
+
+ /* And invalidate the beast just in case. That won't get rid of
+ * a bolted entry though it will be in LRU and so will go away eventually
+ * but let's not bother for now
+ */
+ PPC_ERATILX(0,0,0)
+1:
+ blr
+
+_GLOBAL(__restore_cpu_a2)
+ b __setup_cpu_a2
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 70cbae1..69d1e76 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -62,10 +62,12 @@ extern void __setup_cpu_745x(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_ppc970(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_ppc970MP(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_pa6t(unsigned long offset, struct cpu_spec* spec);
+extern void __setup_cpu_a2(unsigned long offset, struct cpu_spec* spec);
extern void __restore_cpu_pa6t(void);
extern void __restore_cpu_ppc970(void);
extern void __setup_cpu_power7(unsigned long offset, struct cpu_spec* spec);
extern void __restore_cpu_power7(void);
+extern void __restore_cpu_a2(void);
#endif /* CONFIG_PPC64 */
#if defined(CONFIG_E500)
extern void __setup_cpu_e5500(unsigned long offset, struct cpu_spec* spec);
@@ -2011,7 +2013,26 @@ static struct cpu_spec __initdata cpu_specs[] = {
#endif /* CONFIG_PPC32 */
#endif /* CONFIG_E500 */
-#ifdef CONFIG_PPC_BOOK3E_64
+#ifdef CONFIG_PPC_A2
+ { /* Standard A2 (>= DD2) + FPU core */
+ .pvr_mask = 0xffff0000,
+ .pvr_value = 0x00480000,
+ .cpu_name = "A2 (>= DD2)",
+ .cpu_features = CPU_FTRS_A2,
+ .cpu_user_features = COMMON_USER_PPC64,
+ .mmu_features = MMU_FTR_TYPE_3E | MMU_FTR_USE_TLBILX |
+ MMU_FTR_USE_TLBIVAX_BCAST |
+ MMU_FTR_LOCK_BCAST_INVAL |
+ MMU_FTR_USE_TLBRSRV |
+ MMU_FTR_USE_PAIRED_MAS,
+ .icache_bsize = 64,
+ .dcache_bsize = 64,
+ .num_pmcs = 0,
+ .cpu_setup = __setup_cpu_a2,
+ .cpu_restore = __restore_cpu_a2,
+ .machine_check = machine_check_generic,
+ .platform = "ppca2",
+ },
{ /* This is a default entry to get going, to be replaced by
* a real one at some stage
*/
@@ -2029,7 +2050,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
.machine_check = machine_check_generic,
.platform = "power6",
},
-#endif
+#endif /* CONFIG_PPC_A2 */
};
static struct cpu_spec the_cpu_spec;
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 111138c..7c1e1c6 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -107,6 +107,10 @@ config POWER4
depends on PPC64 && PPC_BOOK3S
def_bool y
+config PPC_A2
+ bool
+ depends on PPC_BOOK3E_64
+
config TUNE_CELL
bool "Optimize for Cell Broadband Engine"
depends on PPC64 && PPC_BOOK3S
--
1.7.1
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