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authorYork Sun <yorksun@freescale.com>2012-10-08 07:44:30 +0000
committerAndy Fleming <afleming@freescale.com>2012-10-22 14:31:32 -0500
commitffd06e0231ac3fd0c5810f39f6e23527948df1c7 (patch)
tree7d648c2c312b9cc7a75c0350101aacc67afca399
parent3f0997b3255c1498ac92453aa3a7a1cc95914dfd (diff)
downloadu-boot-linaro-stable-ffd06e0231ac3fd0c5810f39f6e23527948df1c7.tar.gz
powerpc/mpc85xx: Rewrite spin table to comply with ePAPR v1.1
Move spin table to cached memory to comply with ePAPR v1.1. Load R3 with 64-bit value if CONFIG_SYS_PPC64 is defined. 'M' bit is set for DDR TLB to maintain cache coherence. See details in doc/README.mpc85xx-spin-table. Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Andy Fleming <afleming@freescale.com>
-rw-r--r--README6
-rw-r--r--arch/powerpc/cpu/mpc85xx/fdt.c13
-rw-r--r--arch/powerpc/cpu/mpc85xx/mp.c61
-rw-r--r--arch/powerpc/cpu/mpc85xx/mp.h5
-rw-r--r--arch/powerpc/cpu/mpc85xx/release.S179
-rw-r--r--arch/powerpc/cpu/mpc85xx/tlb.c2
-rw-r--r--arch/powerpc/include/asm/config_mpc85xx.h3
-rw-r--r--doc/README.mpc85xx-spin-table26
8 files changed, 183 insertions, 112 deletions
diff --git a/README b/README
index df4aed14e..4dad1594e 100644
--- a/README
+++ b/README
@@ -363,6 +363,12 @@ The following options need to be configured:
ICache only when Code runs from RAM.
- 85xx CPU Options:
+ CONFIG_SYS_PPC64
+
+ Specifies that the core is a 64-bit PowerPC implementation (implements
+ the "64" category of the Power ISA). This is necessary for ePAPR
+ compliance, among other possible reasons.
+
CONFIG_SYS_FSL_TBCLK_DIV
Defines the core time base clock divider ratio compared to the
diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c
index 822148135..a364ef216 100644
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -47,7 +47,7 @@ extern void ft_srio_setup(void *blob);
void ft_fixup_cpu(void *blob, u64 memory_limit)
{
int off;
- ulong spin_tbl_addr = get_spin_phys_addr();
+ phys_addr_t spin_tbl_addr = get_spin_phys_addr();
u32 bootpg = determine_mp_bootpg(NULL);
u32 id = get_my_id();
const char *enable_method;
@@ -97,7 +97,16 @@ void ft_fixup_cpu(void *blob, u64 memory_limit)
if ((u64)bootpg < memory_limit) {
off = fdt_add_mem_rsv(blob, bootpg, (u64)4096);
if (off < 0)
- printf("%s: %s\n", __FUNCTION__, fdt_strerror(off));
+ printf("Failed to reserve memory for bootpg: %s\n",
+ fdt_strerror(off));
+ }
+ /* Reserve spin table page */
+ if (spin_tbl_addr < memory_limit) {
+ off = fdt_add_mem_rsv(blob,
+ (spin_tbl_addr & ~0xffful), 4096);
+ if (off < 0)
+ printf("Failed to reserve memory for spin table: %s\n",
+ fdt_strerror(off));
}
}
#endif
diff --git a/arch/powerpc/cpu/mpc85xx/mp.c b/arch/powerpc/cpu/mpc85xx/mp.c
index 881b68175..e1197ac9e 100644
--- a/arch/powerpc/cpu/mpc85xx/mp.c
+++ b/arch/powerpc/cpu/mpc85xx/mp.c
@@ -33,6 +33,8 @@
DECLARE_GLOBAL_DATA_PTR;
u32 fsl_ddr_get_intl3r(void);
+extern u32 __spin_table[];
+
u32 get_my_id()
{
return mfspr(SPRN_PIR);
@@ -78,10 +80,10 @@ int cpu_status(int nr)
return 0;
if (nr == id) {
- table = (u32 *)get_spin_virt_addr();
+ table = (u32 *)&__spin_table;
printf("table base @ 0x%p\n", table);
} else {
- table = (u32 *)get_spin_virt_addr() + nr * NUM_BOOT_ENTRY;
+ table = (u32 *)&__spin_table + nr * NUM_BOOT_ENTRY;
printf("Running on cpu %d\n", id);
printf("\n");
printf("table @ 0x%p\n", table);
@@ -154,7 +156,7 @@ static u8 boot_entry_map[4] = {
int cpu_release(int nr, int argc, char * const argv[])
{
- u32 i, val, *table = (u32 *)get_spin_virt_addr() + nr * NUM_BOOT_ENTRY;
+ u32 i, val, *table = (u32 *)&__spin_table + nr * NUM_BOOT_ENTRY;
u64 boot_addr;
if (hold_cores_in_reset(1))
@@ -200,11 +202,11 @@ u32 determine_mp_bootpg(unsigned int *pagesize)
struct law_entry e;
#endif
- /* if we have 4G or more of memory, put the boot page at 4Gb-4k */
- if ((u64)gd->ram_size > 0xfffff000)
- bootpg = 0xfffff000;
- else
- bootpg = gd->ram_size - 4096;
+
+ /* use last 4K of mapped memory */
+ bootpg = ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
+ CONFIG_MAX_MEM_MAPPED : gd->ram_size) +
+ CONFIG_SYS_SDRAM_BASE - 4096;
if (pagesize)
*pagesize = 4096;
@@ -255,29 +257,16 @@ u32 determine_mp_bootpg(unsigned int *pagesize)
return bootpg;
}
-ulong get_spin_phys_addr(void)
-{
- extern ulong __secondary_start_page;
- extern ulong __spin_table;
-
- return (determine_mp_bootpg() +
- (ulong)&__spin_table - (ulong)&__secondary_start_page);
-}
-
-ulong get_spin_virt_addr(void)
+phys_addr_t get_spin_phys_addr(void)
{
- extern ulong __secondary_start_page;
- extern ulong __spin_table;
-
- return (CONFIG_BPTR_VIRT_ADDR +
- (ulong)&__spin_table - (ulong)&__secondary_start_page);
+ return virt_to_phys(&__spin_table);
}
#ifdef CONFIG_FSL_CORENET
static void plat_mp_up(unsigned long bootpg, unsigned int pagesize)
{
u32 cpu_up_mask, whoami, brsize = LAW_SIZE_4K;
- u32 *table = (u32 *)get_spin_virt_addr();
+ u32 *table = (u32 *)&__spin_table;
volatile ccsr_gur_t *gur;
volatile ccsr_local_t *ccm;
volatile ccsr_rcpm_t *rcpm;
@@ -356,7 +345,7 @@ static void plat_mp_up(unsigned long bootpg, unsigned int pagesize)
static void plat_mp_up(unsigned long bootpg, unsigned int pagesize)
{
u32 up, cpu_up_mask, whoami;
- u32 *table = (u32 *)get_spin_virt_addr();
+ u32 *table = (u32 *)&__spin_table;
volatile u32 bpcr;
volatile ccsr_local_ecm_t *ecm = (void *)(CONFIG_SYS_MPC85xx_ECM_ADDR);
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
@@ -440,10 +429,11 @@ void cpu_mp_lmb_reserve(struct lmb *lmb)
void setup_mp(void)
{
- extern ulong __secondary_start_page;
- extern ulong __bootpg_addr;
+ extern u32 __secondary_start_page;
+ extern u32 __bootpg_addr, __spin_table_addr, __second_half_boot_page;
- ulong fixup = (ulong)&__secondary_start_page;
+ int i;
+ ulong fixup = (u32)&__secondary_start_page;
u32 bootpg, bootpg_map, pagesize;
bootpg = determine_mp_bootpg(&pagesize);
@@ -464,11 +454,20 @@ void setup_mp(void)
if (hold_cores_in_reset(0))
return;
- /* Store the bootpg's SDRAM address for use by secondary CPU cores */
- __bootpg_addr = bootpg;
+ /*
+ * Store the bootpg's cache-able half address for use by secondary
+ * CPU cores to continue to boot
+ */
+ __bootpg_addr = (u32)virt_to_phys(&__second_half_boot_page);
+
+ /* Store spin table's physical address for use by secondary cores */
+ __spin_table_addr = (u32)get_spin_phys_addr();
+
+ /* flush bootpg it before copying invalidate any staled cacheline */
+ flush_cache(bootpg, 4096);
/* look for the tlb covering the reset page, there better be one */
- int i = find_tlb_idx((void *)CONFIG_BPTR_VIRT_ADDR, 1);
+ i = find_tlb_idx((void *)CONFIG_BPTR_VIRT_ADDR, 1);
/* we found a match */
if (i != -1) {
diff --git a/arch/powerpc/cpu/mpc85xx/mp.h b/arch/powerpc/cpu/mpc85xx/mp.h
index 87bac3715..ad9950bcf 100644
--- a/arch/powerpc/cpu/mpc85xx/mp.h
+++ b/arch/powerpc/cpu/mpc85xx/mp.h
@@ -3,8 +3,7 @@
#include <asm/mp.h>
-ulong get_spin_phys_addr(void);
-ulong get_spin_virt_addr(void);
+phys_addr_t get_spin_phys_addr(void);
u32 get_my_id(void);
int hold_cores_in_reset(int verbose);
@@ -16,7 +15,7 @@ int hold_cores_in_reset(int verbose);
#define BOOT_ENTRY_PIR 5
#define BOOT_ENTRY_R6_UPPER 6
#define BOOT_ENTRY_R6_LOWER 7
-#define NUM_BOOT_ENTRY 8
+#define NUM_BOOT_ENTRY 16 /* pad to 64 bytes */
#define SIZE_BOOT_ENTRY (NUM_BOOT_ENTRY * sizeof(u32))
#endif
diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S
index d08b1f3dc..4ba44a902 100644
--- a/arch/powerpc/cpu/mpc85xx/release.S
+++ b/arch/powerpc/cpu/mpc85xx/release.S
@@ -150,10 +150,14 @@ __secondary_start_page:
#define toreset(x) (x - __secondary_start_page + 0xfffff000)
/* get our PIR to figure out our table entry */
- lis r3,toreset(__spin_table)@h
- ori r3,r3,toreset(__spin_table)@l
+ lis r3,toreset(__spin_table_addr)@h
+ ori r3,r3,toreset(__spin_table_addr)@l
+ lwz r3,0(r3)
- /* r10 has the base address for the entry */
+ /*
+ * r10 has the base address for the entry.
+ * we cannot access it yet before setting up a new TLB
+ */
mfspr r0,SPRN_PIR
#if defined(CONFIG_E6500)
/*
@@ -180,7 +184,7 @@ __secondary_start_page:
#else
mr r4,r0
#endif
- slwi r8,r4,5
+ slwi r8,r4,6 /* spin table is padded to 64 byte */
add r10,r3,r8
#ifdef CONFIG_E6500
@@ -277,73 +281,111 @@ __secondary_start_page:
beq 2b
#endif
3:
-
-#define EPAPR_MAGIC (0x45504150)
-#define ENTRY_ADDR_UPPER 0
-#define ENTRY_ADDR_LOWER 4
-#define ENTRY_R3_UPPER 8
-#define ENTRY_R3_LOWER 12
-#define ENTRY_RESV 16
-#define ENTRY_PIR 20
-#define ENTRY_R6_UPPER 24
-#define ENTRY_R6_LOWER 28
-#define ENTRY_SIZE 32
-
- /* setup the entry */
- li r3,0
- li r8,1
- stw r4,ENTRY_PIR(r10)
- stw r3,ENTRY_ADDR_UPPER(r10)
- stw r8,ENTRY_ADDR_LOWER(r10)
- stw r3,ENTRY_R3_UPPER(r10)
- stw r4,ENTRY_R3_LOWER(r10)
- stw r3,ENTRY_R6_UPPER(r10)
- stw r3,ENTRY_R6_LOWER(r10)
-
- /* load r13 with the address of the 'bootpg' in SDRAM */
- lis r13,toreset(__bootpg_addr)@h
- ori r13,r13,toreset(__bootpg_addr)@l
+ /* setup mapping for the spin table, WIMGE=0b00100 */
+ lis r13,toreset(__spin_table_addr)@h
+ ori r13,r13,toreset(__spin_table_addr)@l
lwz r13,0(r13)
+ /* mask by 4K */
+ rlwinm r13,r13,0,0,19
- /* setup mapping for AS = 1, and jump there */
lis r11,(MAS0_TLBSEL(1)|MAS0_ESEL(1))@h
mtspr SPRN_MAS0,r11
lis r11,(MAS1_VALID|MAS1_IPROT)@h
ori r11,r11,(MAS1_TS|MAS1_TSIZE(BOOKE_PAGESZ_4K))@l
mtspr SPRN_MAS1,r11
- oris r11,r13,(MAS2_I|MAS2_G)@h
- ori r11,r13,(MAS2_I|MAS2_G)@l
+ oris r11,r13,(MAS2_M|MAS2_G)@h
+ ori r11,r13,(MAS2_M|MAS2_G)@l
mtspr SPRN_MAS2,r11
oris r11,r13,(MAS3_SX|MAS3_SW|MAS3_SR)@h
ori r11,r13,(MAS3_SX|MAS3_SW|MAS3_SR)@l
mtspr SPRN_MAS3,r11
+ li r11,0
+ mtspr SPRN_MAS7,r11
tlbwe
- bl 1f
-1: mflr r11
/*
- * OR in 0xfff to create a mask of the bootpg SDRAM address. We use
- * this mask to fixup the cpu spin table and the address that we want
- * to jump to, eg change them from 0xfffffxxx to 0x7ffffxxx if the
- * bootpg is at 0x7ffff000 in SDRAM.
+ * __bootpg_addr has the address of __second_half_boot_page
+ * jump there in AS=1 space with cache enabled
*/
- ori r13,r13,0xfff
- and r11, r11, r13
- and r10, r10, r13
-
- addi r11,r11,(2f-1b)
+ lis r13,toreset(__bootpg_addr)@h
+ ori r13,r13,toreset(__bootpg_addr)@l
+ lwz r11,0(r13)
+ mtspr SPRN_SRR0,r11
mfmsr r13
ori r12,r13,MSR_IS|MSR_DS@l
-
- mtspr SPRN_SRR0,r11
mtspr SPRN_SRR1,r12
rfi
+ /*
+ * Allocate some space for the SDRAM address of the bootpg.
+ * This variable has to be in the boot page so that it can
+ * be accessed by secondary cores when they come out of reset.
+ */
+ .align L1_CACHE_SHIFT
+ .globl __bootpg_addr
+__bootpg_addr:
+ .long 0
+
+ .global __spin_table_addr
+__spin_table_addr:
+ .long 0
+
+ /*
+ * This variable is set by cpu_init_r() after parsing hwconfig
+ * to enable workaround for erratum NMG_CPU_A011.
+ */
+ .align L1_CACHE_SHIFT
+ .global enable_cpu_a011_workaround
+enable_cpu_a011_workaround:
+ .long 1
+
+ /* Fill in the empty space. The actual reset vector is
+ * the last word of the page */
+__secondary_start_code_end:
+ .space 4092 - (__secondary_start_code_end - __secondary_start_page)
+__secondary_reset_vector:
+ b __secondary_start_page
+
+
+/* this is a separated page for the spin table and cacheable boot code */
+ .align L1_CACHE_SHIFT
+ .global __second_half_boot_page
+__second_half_boot_page:
+#define EPAPR_MAGIC 0x45504150
+#define ENTRY_ADDR_UPPER 0
+#define ENTRY_ADDR_LOWER 4
+#define ENTRY_R3_UPPER 8
+#define ENTRY_R3_LOWER 12
+#define ENTRY_RESV 16
+#define ENTRY_PIR 20
+#define ENTRY_SIZE 64
+ /*
+ * setup the entry
+ * r10 has the base address of the spin table.
+ * spin table is defined as
+ * struct {
+ * uint64_t entry_addr;
+ * uint64_t r3;
+ * uint32_t rsvd1;
+ * uint32_t pir;
+ * };
+ * we pad this struct to 64 bytes so each entry is in its own cacheline
+ */
+ li r3,0
+ li r8,1
+ mfspr r4,SPRN_PIR
+ stw r3,ENTRY_ADDR_UPPER(r10)
+ stw r3,ENTRY_R3_UPPER(r10)
+ stw r4,ENTRY_R3_LOWER(r10)
+ stw r3,ENTRY_RESV(r10)
+ stw r4,ENTRY_PIR(r10)
+ msync
+ stw r8,ENTRY_ADDR_LOWER(r10)
+
/* spin waiting for addr */
-2:
- lwz r4,ENTRY_ADDR_LOWER(r10)
+3: lwz r4,ENTRY_ADDR_LOWER(r10)
andi. r11,r4,1
- bne 2b
+ bne 3b
isync
/* setup IVORs to match fixed offsets */
@@ -362,8 +404,17 @@ __secondary_start_page:
/* mask by ~64M to setup our tlb we will jump to */
rlwinm r12,r4,0,0,5
- /* setup r3, r4, r5, r6, r7, r8, r9 */
+ /*
+ * setup r3, r4, r5, r6, r7, r8, r9
+ * r3 contains the value to put in the r3 register at secondary cpu
+ * entry. The high 32-bits are ignored on 32-bit chip implementations.
+ * 64-bit chip implementations however shall load all 64-bits
+ */
+#ifdef CONFIG_SYS_PPC64
+ ld r3,ENTRY_R3_UPPER(r10)
+#else
lwz r3,ENTRY_R3_LOWER(r10)
+#endif
li r4,0
li r5,0
li r6,0
@@ -404,32 +455,10 @@ __secondary_start_page:
mtspr SPRN_SRR1,r13
rfi
- /*
- * Allocate some space for the SDRAM address of the bootpg.
- * This variable has to be in the boot page so that it can
- * be accessed by secondary cores when they come out of reset.
- */
- .globl __bootpg_addr
-__bootpg_addr:
- .long 0
- .align L1_CACHE_SHIFT
+ .align 6
.globl __spin_table
__spin_table:
.space CONFIG_MAX_CPUS*ENTRY_SIZE
-
- /*
- * This variable is set by cpu_init_r() after parsing hwconfig
- * to enable workaround for erratum NMG_CPU_A011.
- */
- .align L1_CACHE_SHIFT
- .global enable_cpu_a011_workaround
-enable_cpu_a011_workaround:
- .long 1
-
- /* Fill in the empty space. The actual reset vector is
- * the last word of the page */
-__secondary_start_code_end:
- .space 4092 - (__secondary_start_code_end - __secondary_start_page)
-__secondary_reset_vector:
- b __secondary_start_page
+__spin_table_end:
+ .space 4096 - (__spin_table_end - __spin_table)
diff --git a/arch/powerpc/cpu/mpc85xx/tlb.c b/arch/powerpc/cpu/mpc85xx/tlb.c
index 929f6a607..a548dec9a 100644
--- a/arch/powerpc/cpu/mpc85xx/tlb.c
+++ b/arch/powerpc/cpu/mpc85xx/tlb.c
@@ -249,7 +249,7 @@ setup_ddr_tlbs_phys(phys_addr_t p_addr, unsigned int memsize_in_meg)
{
int i;
unsigned int tlb_size;
- unsigned int wimge = 0;
+ unsigned int wimge = MAS2_M;
unsigned int ram_tlb_address = (unsigned int)CONFIG_SYS_DDR_SDRAM_BASE;
unsigned int max_cam;
u64 size, memsize = (u64)memsize_in_meg << 20;
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 92ca2ad74..8a7c81b80 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -416,6 +416,7 @@
#define CONFIG_SYS_FSL_ERRATUM_SRIO_A004034
#elif defined(CONFIG_PPC_P5020) /* also supports P5010 */
+#define CONFIG_SYS_PPC64 /* 64-bit core */
#define CONFIG_SYS_FSL_QORIQ_CHASSIS1
#define CONFIG_MAX_CPUS 2
#define CONFIG_SYS_FSL_NUM_CC_PLLS 2
@@ -485,6 +486,7 @@
#define CONFIG_SYS_FSL_ERRATUM_ESDHC111
#elif defined(CONFIG_PPC_T4240)
+#define CONFIG_SYS_PPC64 /* 64-bit core */
#define CONFIG_FSL_CORENET /* Freescale CoreNet platform */
#define CONFIG_SYS_FSL_QORIQ_CHASSIS2 /* Freescale Chassis generation 2 */
#define CONFIG_SYS_FSL_QMAN_V3 /* QMAN version 3 */
@@ -516,6 +518,7 @@
#define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000
#elif defined(CONFIG_PPC_B4860)
+#define CONFIG_SYS_PPC64 /* 64-bit core */
#define CONFIG_FSL_CORENET /* Freescale CoreNet platform */
#define CONFIG_SYS_FSL_QORIQ_CHASSIS2 /* Freescale Chassis generation 2 */
#define CONFIG_SYS_FSL_QMAN_V3 /* QMAN version 3 */
diff --git a/doc/README.mpc85xx-spin-table b/doc/README.mpc85xx-spin-table
new file mode 100644
index 000000000..8da768a2a
--- /dev/null
+++ b/doc/README.mpc85xx-spin-table
@@ -0,0 +1,26 @@
+Spin table in cache
+=====================================
+As specified by ePAPR v1.1, the spin table needs to be in cached memory. After
+DDR is initialized and U-boot relocates itself into DDR, the spin table is
+accessible for core 0. It is part of release.S, within 4KB range after
+__secondary_start_page. For other cores to use the spin table, the booting
+process is described below:
+
+Core 0 sets up the reset page on the top 4K of memory (or 4GB if total memory
+is more than 4GB), and creates a TLB to map it to 0xffff_f000, regardless of
+the physical address of this page, with WIMGE=0b01010. Core 0 also enables boot
+page translation for secondary cores to use this page of memory. Then 4KB
+memory is copied from __secondary_start_page to the boot page, after flusing
+cache because this page is mapped as normal DDR. Before copying the reset page,
+core 0 puts the physical address of the spin table (which is in release.S and
+relocated to the top of mapped memory) into a variable __spin_table_addr so
+that secondary cores can see it.
+
+When secondary cores boot up from 0xffff_f000 page, they only have one default
+TLB. While booting, they set up another TLB in AS=1 space and jump into
+the new space. The new TLB covers the physical address of the spin table page,
+with WIMGE =0b00100. Now secondary cores can keep polling the spin table
+without stress DDR bus because both the code and the spin table is in cache.
+
+For the above to work, DDR has to set the 'M' bit of WIMGE, in order to keep
+cache coherence.