diff options
| -rw-r--r-- | arch/mips/Kconfig | 3 | ||||
| -rw-r--r-- | arch/mips/include/asm/mips-cm.h | 322 | ||||
| -rw-r--r-- | arch/mips/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/mips-cm.c | 121 |
4 files changed, 448 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 17f198914e6..a3bc0143252 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2006,6 +2006,9 @@ config MIPS_CMP config MIPS_GIC_IPI bool +config MIPS_CM + bool + config SB1_PASS_1_WORKAROUNDS bool depends on CPU_SB1_PASS_1 diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h new file mode 100644 index 00000000000..12cae5e294c --- /dev/null +++ b/arch/mips/include/asm/mips-cm.h @@ -0,0 +1,322 @@ +/* + * Copyright (C) 2013 Imagination Technologies + * Author: Paul Burton <paul.burton@imgtec.com> + * + * 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 __MIPS_ASM_MIPS_CM_H__ +#define __MIPS_ASM_MIPS_CM_H__ + +#include <linux/io.h> +#include <linux/types.h> + +/* The base address of the CM GCR block */ +extern void __iomem *mips_cm_base; + +/* The base address of the CM L2-only sync region */ +extern void __iomem *mips_cm_l2sync_base; + +/** + * __mips_cm_phys_base - retrieve the physical base address of the CM + * + * This function returns the physical base address of the Coherence Manager + * global control block, or 0 if no Coherence Manager is present. It provides + * a default implementation which reads the CMGCRBase register where available, + * and may be overriden by platforms which determine this address in a + * different way by defining a function with the same prototype except for the + * name mips_cm_phys_base (without underscores). + */ +extern phys_t __mips_cm_phys_base(void); + +/** + * mips_cm_probe - probe for a Coherence Manager + * + * Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM + * is successfully detected, else -errno. + */ +#ifdef CONFIG_MIPS_CM +extern int mips_cm_probe(void); +#else +static inline int mips_cm_probe(void) +{ + return -ENODEV; +} +#endif + +/** + * mips_cm_present - determine whether a Coherence Manager is present + * + * Returns true if a CM is present in the system, else false. + */ +static inline bool mips_cm_present(void) +{ +#ifdef CONFIG_MIPS_CM + return mips_cm_base != NULL; +#else + return false; +#endif +} + +/** + * mips_cm_has_l2sync - determine whether an L2-only sync region is present + * + * Returns true if the system implements an L2-only sync region, else false. + */ +static inline bool mips_cm_has_l2sync(void) +{ +#ifdef CONFIG_MIPS_CM + return mips_cm_l2sync_base != NULL; +#else + return false; +#endif +} + +/* Offsets to register blocks from the CM base address */ +#define MIPS_CM_GCB_OFS 0x0000 /* Global Control Block */ +#define MIPS_CM_CLCB_OFS 0x2000 /* Core Local Control Block */ +#define MIPS_CM_COCB_OFS 0x4000 /* Core Other Control Block */ +#define MIPS_CM_GDB_OFS 0x6000 /* Global Debug Block */ + +/* Total size of the CM memory mapped registers */ +#define MIPS_CM_GCR_SIZE 0x8000 + +/* Size of the L2-only sync region */ +#define MIPS_CM_L2SYNC_SIZE 0x1000 + +/* Macros to ease the creation of register access functions */ +#define BUILD_CM_R_(name, off) \ +static inline u32 *addr_gcr_##name(void) \ +{ \ + return (u32 *)(mips_cm_base + (off)); \ +} \ + \ +static inline u32 read_gcr_##name(void) \ +{ \ + return readl(addr_gcr_##name()); \ +} + +#define BUILD_CM__W(name, off) \ +static inline void write_gcr_##name(u32 value) \ +{ \ + writel(value, addr_gcr_##name()); \ +} + +#define BUILD_CM_RW(name, off) \ + BUILD_CM_R_(name, off) \ + BUILD_CM__W(name, off) + +#define BUILD_CM_Cx_R_(name, off) \ + BUILD_CM_R_(cl_##name, MIPS_CM_CLCB_OFS + (off)) \ + BUILD_CM_R_(co_##name, MIPS_CM_COCB_OFS + (off)) + +#define BUILD_CM_Cx__W(name, off) \ + BUILD_CM__W(cl_##name, MIPS_CM_CLCB_OFS + (off)) \ + BUILD_CM__W(co_##name, MIPS_CM_COCB_OFS + (off)) + +#define BUILD_CM_Cx_RW(name, off) \ + BUILD_CM_Cx_R_(name, off) \ + BUILD_CM_Cx__W(name, off) + +/* GCB register accessor functions */ +BUILD_CM_R_(config, MIPS_CM_GCB_OFS + 0x00) +BUILD_CM_RW(base, MIPS_CM_GCB_OFS + 0x08) +BUILD_CM_RW(access, MIPS_CM_GCB_OFS + 0x20) +BUILD_CM_R_(rev, MIPS_CM_GCB_OFS + 0x30) +BUILD_CM_RW(error_mask, MIPS_CM_GCB_OFS + 0x40) +BUILD_CM_RW(error_cause, MIPS_CM_GCB_OFS + 0x48) +BUILD_CM_RW(error_addr, MIPS_CM_GCB_OFS + 0x50) +BUILD_CM_RW(error_mult, MIPS_CM_GCB_OFS + 0x58) +BUILD_CM_RW(l2_only_sync_base, MIPS_CM_GCB_OFS + 0x70) +BUILD_CM_RW(gic_base, MIPS_CM_GCB_OFS + 0x80) +BUILD_CM_RW(cpc_base, MIPS_CM_GCB_OFS + 0x88) +BUILD_CM_RW(reg0_base, MIPS_CM_GCB_OFS + 0x90) +BUILD_CM_RW(reg0_mask, MIPS_CM_GCB_OFS + 0x98) +BUILD_CM_RW(reg1_base, MIPS_CM_GCB_OFS + 0xa0) +BUILD_CM_RW(reg1_mask, MIPS_CM_GCB_OFS + 0xa8) +BUILD_CM_RW(reg2_base, MIPS_CM_GCB_OFS + 0xb0) +BUILD_CM_RW(reg2_mask, MIPS_CM_GCB_OFS + 0xb8) +BUILD_CM_RW(reg3_base, MIPS_CM_GCB_OFS + 0xc0) +BUILD_CM_RW(reg3_mask, MIPS_CM_GCB_OFS + 0xc8) +BUILD_CM_R_(gic_status, MIPS_CM_GCB_OFS + 0xd0) +BUILD_CM_R_(cpc_status, MIPS_CM_GCB_OFS + 0xf0) + +/* Core Local & Core Other register accessor functions */ +BUILD_CM_Cx_RW(reset_release, 0x00) +BUILD_CM_Cx_RW(coherence, 0x08) +BUILD_CM_Cx_R_(config, 0x10) +BUILD_CM_Cx_RW(other, 0x18) +BUILD_CM_Cx_RW(reset_base, 0x20) +BUILD_CM_Cx_R_(id, 0x28) +BUILD_CM_Cx_RW(reset_ext_base, 0x30) +BUILD_CM_Cx_R_(tcid_0_priority, 0x40) +BUILD_CM_Cx_R_(tcid_1_priority, 0x48) +BUILD_CM_Cx_R_(tcid_2_priority, 0x50) +BUILD_CM_Cx_R_(tcid_3_priority, 0x58) +BUILD_CM_Cx_R_(tcid_4_priority, 0x60) +BUILD_CM_Cx_R_(tcid_5_priority, 0x68) +BUILD_CM_Cx_R_(tcid_6_priority, 0x70) +BUILD_CM_Cx_R_(tcid_7_priority, 0x78) +BUILD_CM_Cx_R_(tcid_8_priority, 0x80) + +/* GCR_CONFIG register fields */ +#define CM_GCR_CONFIG_NUMIOCU_SHF 8 +#define CM_GCR_CONFIG_NUMIOCU_MSK (_ULCAST_(0xf) << 8) +#define CM_GCR_CONFIG_PCORES_SHF 0 +#define CM_GCR_CONFIG_PCORES_MSK (_ULCAST_(0xff) << 0) + +/* GCR_BASE register fields */ +#define CM_GCR_BASE_GCRBASE_SHF 15 +#define CM_GCR_BASE_GCRBASE_MSK (_ULCAST_(0x1ffff) << 15) +#define CM_GCR_BASE_CMDEFTGT_SHF 0 +#define CM_GCR_BASE_CMDEFTGT_MSK (_ULCAST_(0x3) << 0) +#define CM_GCR_BASE_CMDEFTGT_DISABLED 0 +#define CM_GCR_BASE_CMDEFTGT_MEM 1 +#define CM_GCR_BASE_CMDEFTGT_IOCU0 2 +#define CM_GCR_BASE_CMDEFTGT_IOCU1 3 + +/* GCR_ACCESS register fields */ +#define CM_GCR_ACCESS_ACCESSEN_SHF 0 +#define CM_GCR_ACCESS_ACCESSEN_MSK (_ULCAST_(0xff) << 0) + +/* GCR_REV register fields */ +#define CM_GCR_REV_MAJOR_SHF 8 +#define CM_GCR_REV_MAJOR_MSK (_ULCAST_(0xff) << 8) +#define CM_GCR_REV_MINOR_SHF 0 +#define CM_GCR_REV_MINOR_MSK (_ULCAST_(0xff) << 0) + +/* GCR_ERROR_CAUSE register fields */ +#define CM_GCR_ERROR_CAUSE_ERRTYPE_SHF 27 +#define CM_GCR_ERROR_CAUSE_ERRTYPE_MSK (_ULCAST_(0x1f) << 27) +#define CM_GCR_ERROR_CAUSE_ERRINFO_SHF 0 +#define CM_GCR_ERROR_CAUSE_ERRINGO_MSK (_ULCAST_(0x7ffffff) << 0) + +/* GCR_ERROR_MULT register fields */ +#define CM_GCR_ERROR_MULT_ERR2ND_SHF 0 +#define CM_GCR_ERROR_MULT_ERR2ND_MSK (_ULCAST_(0x1f) << 0) + +/* GCR_L2_ONLY_SYNC_BASE register fields */ +#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_SHF 12 +#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK (_ULCAST_(0xfffff) << 12) +#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_SHF 0 +#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK (_ULCAST_(0x1) << 0) + +/* GCR_GIC_BASE register fields */ +#define CM_GCR_GIC_BASE_GICBASE_SHF 17 +#define CM_GCR_GIC_BASE_GICBASE_MSK (_ULCAST_(0x7fff) << 17) +#define CM_GCR_GIC_BASE_GICEN_SHF 0 +#define CM_GCR_GIC_BASE_GICEN_MSK (_ULCAST_(0x1) << 0) + +/* GCR_CPC_BASE register fields */ +#define CM_GCR_CPC_BASE_CPCBASE_SHF 17 +#define CM_GCR_CPC_BASE_CPCBASE_MSK (_ULCAST_(0x7fff) << 17) +#define CM_GCR_CPC_BASE_CPCEN_SHF 0 +#define CM_GCR_CPC_BASE_CPCEN_MSK (_ULCAST_(0x1) << 0) + +/* GCR_REGn_BASE register fields */ +#define CM_GCR_REGn_BASE_BASEADDR_SHF 16 +#define CM_GCR_REGn_BASE_BASEADDR_MSK (_ULCAST_(0xffff) << 16) + +/* GCR_REGn_MASK register fields */ +#define CM_GCR_REGn_MASK_ADDRMASK_SHF 16 +#define CM_GCR_REGn_MASK_ADDRMASK_MSK (_ULCAST_(0xffff) << 16) +#define CM_GCR_REGn_MASK_CCAOVR_SHF 5 +#define CM_GCR_REGn_MASK_CCAOVR_MSK (_ULCAST_(0x3) << 5) +#define CM_GCR_REGn_MASK_CCAOVREN_SHF 4 +#define CM_GCR_REGn_MASK_CCAOVREN_MSK (_ULCAST_(0x1) << 4) +#define CM_GCR_REGn_MASK_DROPL2_SHF 2 +#define CM_GCR_REGn_MASK_DROPL2_MSK (_ULCAST_(0x1) << 2) +#define CM_GCR_REGn_MASK_CMTGT_SHF 0 +#define CM_GCR_REGn_MASK_CMTGT_MSK (_ULCAST_(0x3) << 0) +#define CM_GCR_REGn_MASK_CMTGT_DISABLED (_ULCAST_(0x0) << 0) +#define CM_GCR_REGn_MASK_CMTGT_MEM (_ULCAST_(0x1) << 0) +#define CM_GCR_REGn_MASK_CMTGT_IOCU0 (_ULCAST_(0x2) << 0) +#define CM_GCR_REGn_MASK_CMTGT_IOCU1 (_ULCAST_(0x3) << 0) + +/* GCR_GIC_STATUS register fields */ +#define CM_GCR_GIC_STATUS_EX_SHF 0 +#define CM_GCR_GIC_STATUS_EX_MSK (_ULCAST_(0x1) << 0) + +/* GCR_CPC_STATUS register fields */ +#define CM_GCR_CPC_STATUS_EX_SHF 0 +#define CM_GCR_CPC_STATUS_EX_MSK (_ULCAST_(0x1) << 0) + +/* GCR_Cx_COHERENCE register fields */ +#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_SHF 0 +#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK (_ULCAST_(0xff) << 0) + +/* GCR_Cx_CONFIG register fields */ +#define CM_GCR_Cx_CONFIG_IOCUTYPE_SHF 10 +#define CM_GCR_Cx_CONFIG_IOCUTYPE_MSK (_ULCAST_(0x3) << 10) +#define CM_GCR_Cx_CONFIG_PVPE_SHF 0 +#define CM_GCR_Cx_CONFIG_PVPE_MSK (_ULCAST_(0x1ff) << 0) + +/* GCR_Cx_OTHER register fields */ +#define CM_GCR_Cx_OTHER_CORENUM_SHF 16 +#define CM_GCR_Cx_OTHER_CORENUM_MSK (_ULCAST_(0xffff) << 16) + +/* GCR_Cx_RESET_BASE register fields */ +#define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_SHF 12 +#define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_MSK (_ULCAST_(0xfffff) << 12) + +/* GCR_Cx_RESET_EXT_BASE register fields */ +#define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_SHF 31 +#define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_MSK (_ULCAST_(0x1) << 31) +#define CM_GCR_Cx_RESET_EXT_BASE_UEB_SHF 30 +#define CM_GCR_Cx_RESET_EXT_BASE_UEB_MSK (_ULCAST_(0x1) << 30) +#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_SHF 20 +#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_MSK (_ULCAST_(0xff) << 20) +#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_SHF 1 +#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_MSK (_ULCAST_(0x7f) << 1) +#define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_SHF 0 +#define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_MSK (_ULCAST_(0x1) << 0) + +/** + * mips_cm_numcores - return the number of cores present in the system + * + * Returns the value of the PCORES field of the GCR_CONFIG register plus 1, or + * zero if no Coherence Manager is present. + */ +static inline unsigned mips_cm_numcores(void) +{ + if (!mips_cm_present()) + return 0; + + return ((read_gcr_config() & CM_GCR_CONFIG_PCORES_MSK) + >> CM_GCR_CONFIG_PCORES_SHF) + 1; +} + +/** + * mips_cm_numiocu - return the number of IOCUs present in the system + * + * Returns the value of the NUMIOCU field of the GCR_CONFIG register, or zero + * if no Coherence Manager is present. + */ +static inline unsigned mips_cm_numiocu(void) +{ + if (!mips_cm_present()) + return 0; + + return (read_gcr_config() & CM_GCR_CONFIG_NUMIOCU_MSK) + >> CM_GCR_CONFIG_NUMIOCU_SHF; +} + +/** + * mips_cm_l2sync - perform an L2-only sync operation + * + * If an L2-only sync region is present in the system then this function + * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV. + */ +static inline int mips_cm_l2sync(void) +{ + if (!mips_cm_has_l2sync()) + return -ENODEV; + + writel(0, mips_cm_l2sync_base); + return 0; +} + +#endif /* __MIPS_ASM_MIPS_CM_H__ */ diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index 786a51ddbb7..be56cd8d213 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -103,6 +103,8 @@ obj-$(CONFIG_HW_PERF_EVENTS) += perf_event_mipsxx.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o +obj-$(CONFIG_MIPS_CM) += mips-cm.o + # # DSP ASE supported for MIPS32 or MIPS64 Release 2 cores only. It is not # safe to unconditionnaly use the assembler -mdsp / -mdspr2 switches diff --git a/arch/mips/kernel/mips-cm.c b/arch/mips/kernel/mips-cm.c new file mode 100644 index 00000000000..f76f7a08412 --- /dev/null +++ b/arch/mips/kernel/mips-cm.c @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2013 Imagination Technologies + * Author: Paul Burton <paul.burton@imgtec.com> + * + * 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 <linux/errno.h> + +#include <asm/mips-cm.h> +#include <asm/mipsregs.h> + +void __iomem *mips_cm_base; +void __iomem *mips_cm_l2sync_base; + +phys_t __mips_cm_phys_base(void) +{ + u32 config3 = read_c0_config3(); + u32 cmgcr; + + /* Check the CMGCRBase register is implemented */ + if (!(config3 & MIPS_CONF3_CMGCR)) + return 0; + + /* Read the address from CMGCRBase */ + cmgcr = read_c0_cmgcrbase(); + return (cmgcr & MIPS_CMGCRF_BASE) << (36 - 32); +} + +phys_t mips_cm_phys_base(void) + __attribute__((weak, alias("__mips_cm_phys_base"))); + +phys_t __mips_cm_l2sync_phys_base(void) +{ + u32 base_reg; + + /* + * If the L2-only sync region is already enabled then leave it at it's + * current location. + */ + base_reg = read_gcr_l2_only_sync_base(); + if (base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK) + return base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK; + + /* Default to following the CM */ + return mips_cm_phys_base() + MIPS_CM_GCR_SIZE; +} + +phys_t mips_cm_l2sync_phys_base(void) + __attribute__((weak, alias("__mips_cm_l2sync_phys_base"))); + +static void mips_cm_probe_l2sync(void) +{ + unsigned major_rev; + phys_t addr; + + /* L2-only sync was introduced with CM major revision 6 */ + major_rev = (read_gcr_rev() & CM_GCR_REV_MAJOR_MSK) >> + CM_GCR_REV_MAJOR_SHF; + if (major_rev < 6) + return; + + /* Find a location for the L2 sync region */ + addr = mips_cm_l2sync_phys_base(); + BUG_ON((addr & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK) != addr); + if (!addr) + return; + + /* Set the region base address & enable it */ + write_gcr_l2_only_sync_base(addr | CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK); + + /* Map the region */ + mips_cm_l2sync_base = ioremap_nocache(addr, MIPS_CM_L2SYNC_SIZE); +} + +int mips_cm_probe(void) +{ + phys_t addr; + u32 base_reg; + + addr = mips_cm_phys_base(); + BUG_ON((addr & CM_GCR_BASE_GCRBASE_MSK) != addr); + if (!addr) + return -ENODEV; + + mips_cm_base = ioremap_nocache(addr, MIPS_CM_GCR_SIZE); + if (!mips_cm_base) + return -ENXIO; + + /* sanity check that we're looking at a CM */ + base_reg = read_gcr_base(); + if ((base_reg & CM_GCR_BASE_GCRBASE_MSK) != addr) { + pr_err("GCRs appear to have been moved (expected them at 0x%08lx)!\n", + (unsigned long)addr); + mips_cm_base = NULL; + return -ENODEV; + } + + /* set default target to memory */ + base_reg &= ~CM_GCR_BASE_CMDEFTGT_MSK; + base_reg |= CM_GCR_BASE_CMDEFTGT_MEM; + write_gcr_base(base_reg); + + /* disable CM regions */ + write_gcr_reg0_base(CM_GCR_REGn_BASE_BASEADDR_MSK); + write_gcr_reg0_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK); + write_gcr_reg1_base(CM_GCR_REGn_BASE_BASEADDR_MSK); + write_gcr_reg1_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK); + write_gcr_reg2_base(CM_GCR_REGn_BASE_BASEADDR_MSK); + write_gcr_reg2_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK); + write_gcr_reg3_base(CM_GCR_REGn_BASE_BASEADDR_MSK); + write_gcr_reg3_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK); + + /* probe for an L2-only sync region */ + mips_cm_probe_l2sync(); + + return 0; +} |