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Diffstat (limited to 'arch/blackfin/kernel/cplb-mpu/cplbmgr.c')
-rw-r--r--arch/blackfin/kernel/cplb-mpu/cplbmgr.c287
1 files changed, 148 insertions, 139 deletions
diff --git a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c
index 99f2831e296..b56bd8514b7 100644
--- a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c
+++ b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c
@@ -1,78 +1,41 @@
/*
- * Blackfin CPLB exception handling.
- * Copyright 2004-2007 Analog Devices Inc.
+ * Blackfin CPLB exception handling for when MPU in on
*
- * 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.
+ * Copyright 2008-2009 Analog Devices Inc.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * Licensed under the GPL-2 or later.
*/
+
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/blackfin.h>
+#include <asm/cacheflush.h>
+#include <asm/cplb.h>
#include <asm/cplbinit.h>
#include <asm/mmu_context.h>
-#define FAULT_RW (1 << 16)
-#define FAULT_USERSUPV (1 << 17)
+/*
+ * WARNING
+ *
+ * This file is compiled with certain -ffixed-reg options. We have to
+ * make sure not to call any functions here that could clobber these
+ * registers.
+ */
int page_mask_nelts;
int page_mask_order;
-unsigned long *current_rwx_mask;
-
-int nr_dcplb_miss, nr_icplb_miss, nr_icplb_supv_miss, nr_dcplb_prot;
-int nr_cplb_flush;
-
-static inline void disable_dcplb(void)
-{
- unsigned long ctrl;
- SSYNC();
- ctrl = bfin_read_DMEM_CONTROL();
- ctrl &= ~ENDCPLB;
- bfin_write_DMEM_CONTROL(ctrl);
- SSYNC();
-}
+unsigned long *current_rwx_mask[NR_CPUS];
-static inline void enable_dcplb(void)
-{
- unsigned long ctrl;
- SSYNC();
- ctrl = bfin_read_DMEM_CONTROL();
- ctrl |= ENDCPLB;
- bfin_write_DMEM_CONTROL(ctrl);
- SSYNC();
-}
-
-static inline void disable_icplb(void)
-{
- unsigned long ctrl;
- SSYNC();
- ctrl = bfin_read_IMEM_CONTROL();
- ctrl &= ~ENICPLB;
- bfin_write_IMEM_CONTROL(ctrl);
- SSYNC();
-}
+int nr_dcplb_miss[NR_CPUS], nr_icplb_miss[NR_CPUS];
+int nr_icplb_supv_miss[NR_CPUS], nr_dcplb_prot[NR_CPUS];
+int nr_cplb_flush[NR_CPUS];
-static inline void enable_icplb(void)
-{
- unsigned long ctrl;
- SSYNC();
- ctrl = bfin_read_IMEM_CONTROL();
- ctrl |= ENICPLB;
- bfin_write_IMEM_CONTROL(ctrl);
- SSYNC();
-}
+#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
+#define MGR_ATTR __attribute__((l1_text))
+#else
+#define MGR_ATTR
+#endif
/*
* Given the contents of the status register, return the index of the
@@ -97,42 +60,42 @@ static inline int write_permitted(int status, unsigned long data)
}
/* Counters to implement round-robin replacement. */
-static int icplb_rr_index, dcplb_rr_index;
+static int icplb_rr_index[NR_CPUS], dcplb_rr_index[NR_CPUS];
/*
* Find an ICPLB entry to be evicted and return its index.
*/
-static int evict_one_icplb(void)
+MGR_ATTR static int evict_one_icplb(unsigned int cpu)
{
int i;
for (i = first_switched_icplb; i < MAX_CPLBS; i++)
- if ((icplb_tbl[i].data & CPLB_VALID) == 0)
+ if ((icplb_tbl[cpu][i].data & CPLB_VALID) == 0)
return i;
- i = first_switched_icplb + icplb_rr_index;
+ i = first_switched_icplb + icplb_rr_index[cpu];
if (i >= MAX_CPLBS) {
i -= MAX_CPLBS - first_switched_icplb;
- icplb_rr_index -= MAX_CPLBS - first_switched_icplb;
+ icplb_rr_index[cpu] -= MAX_CPLBS - first_switched_icplb;
}
- icplb_rr_index++;
+ icplb_rr_index[cpu]++;
return i;
}
-static int evict_one_dcplb(void)
+MGR_ATTR static int evict_one_dcplb(unsigned int cpu)
{
int i;
for (i = first_switched_dcplb; i < MAX_CPLBS; i++)
- if ((dcplb_tbl[i].data & CPLB_VALID) == 0)
+ if ((dcplb_tbl[cpu][i].data & CPLB_VALID) == 0)
return i;
- i = first_switched_dcplb + dcplb_rr_index;
+ i = first_switched_dcplb + dcplb_rr_index[cpu];
if (i >= MAX_CPLBS) {
i -= MAX_CPLBS - first_switched_dcplb;
- dcplb_rr_index -= MAX_CPLBS - first_switched_dcplb;
+ dcplb_rr_index[cpu] -= MAX_CPLBS - first_switched_dcplb;
}
- dcplb_rr_index++;
+ dcplb_rr_index[cpu]++;
return i;
}
-static noinline int dcplb_miss(void)
+MGR_ATTR static noinline int dcplb_miss(unsigned int cpu)
{
unsigned long addr = bfin_read_DCPLB_FAULT_ADDR();
int status = bfin_read_DCPLB_STATUS();
@@ -140,25 +103,34 @@ static noinline int dcplb_miss(void)
int idx;
unsigned long d_data;
- nr_dcplb_miss++;
+ nr_dcplb_miss[cpu]++;
d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
-#ifdef CONFIG_BFIN_DCACHE
- if (addr < _ramend - DMA_UNCACHED_REGION ||
- (reserved_mem_dcache_on && addr >= _ramend &&
- addr < physical_mem_end)) {
+#ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE
+ if (bfin_addr_dcacheable(addr)) {
d_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
-#ifdef CONFIG_BFIN_WT
+# ifdef CONFIG_BFIN_EXTMEM_WRITETHROUGH
d_data |= CPLB_L1_AOW | CPLB_WT;
-#endif
+# endif
}
#endif
- if (addr >= physical_mem_end) {
- if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE
- && (status & FAULT_USERSUPV)) {
- addr &= ~0x3fffff;
- d_data &= ~PAGE_SIZE_4KB;
- d_data |= PAGE_SIZE_4MB;
+
+ if (L2_LENGTH && addr >= L2_START && addr < L2_START + L2_LENGTH) {
+ addr = L2_START;
+ d_data = L2_DMEMORY;
+ } else if (addr >= physical_mem_end) {
+ if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) {
+#if defined(CONFIG_ROMFS_ON_MTD) && defined(CONFIG_MTD_ROM)
+ mask = current_rwx_mask[cpu];
+ if (mask) {
+ int page = (addr - (ASYNC_BANK0_BASE - _ramend)) >> PAGE_SHIFT;
+ int idx = page >> 5;
+ int bit = 1 << (page & 31);
+
+ if (mask[idx] & bit)
+ d_data |= CPLB_USER_RD;
+ }
+#endif
} else if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH
&& (status & (FAULT_RW | FAULT_USERSUPV)) == FAULT_USERSUPV) {
addr &= ~(1 * 1024 * 1024 - 1);
@@ -167,51 +139,53 @@ static noinline int dcplb_miss(void)
} else
return CPLB_PROT_VIOL;
} else if (addr >= _ramend) {
- d_data |= CPLB_USER_RD | CPLB_USER_WR;
+ d_data |= CPLB_USER_RD | CPLB_USER_WR;
+ if (reserved_mem_dcache_on)
+ d_data |= CPLB_L1_CHBL;
} else {
- mask = current_rwx_mask;
+ mask = current_rwx_mask[cpu];
if (mask) {
int page = addr >> PAGE_SHIFT;
- int offs = page >> 5;
+ int idx = page >> 5;
int bit = 1 << (page & 31);
- if (mask[offs] & bit)
+ if (mask[idx] & bit)
d_data |= CPLB_USER_RD;
mask += page_mask_nelts;
- if (mask[offs] & bit)
+ if (mask[idx] & bit)
d_data |= CPLB_USER_WR;
}
}
- idx = evict_one_dcplb();
+ idx = evict_one_dcplb(cpu);
addr &= PAGE_MASK;
- dcplb_tbl[idx].addr = addr;
- dcplb_tbl[idx].data = d_data;
+ dcplb_tbl[cpu][idx].addr = addr;
+ dcplb_tbl[cpu][idx].data = d_data;
- disable_dcplb();
+ _disable_dcplb();
bfin_write32(DCPLB_DATA0 + idx * 4, d_data);
bfin_write32(DCPLB_ADDR0 + idx * 4, addr);
- enable_dcplb();
+ _enable_dcplb();
return 0;
}
-static noinline int icplb_miss(void)
+MGR_ATTR static noinline int icplb_miss(unsigned int cpu)
{
unsigned long addr = bfin_read_ICPLB_FAULT_ADDR();
int status = bfin_read_ICPLB_STATUS();
int idx;
unsigned long i_data;
- nr_icplb_miss++;
+ nr_icplb_miss[cpu]++;
/* If inside the uncached DMA region, fault. */
if (addr >= _ramend - DMA_UNCACHED_REGION && addr < _ramend)
return CPLB_PROT_VIOL;
if (status & FAULT_USERSUPV)
- nr_icplb_supv_miss++;
+ nr_icplb_supv_miss[cpu]++;
/*
* First, try to find a CPLB that matches this address. If we
@@ -219,8 +193,8 @@ static noinline int icplb_miss(void)
* that the instruction crosses a page boundary.
*/
for (idx = first_switched_icplb; idx < MAX_CPLBS; idx++) {
- if (icplb_tbl[idx].data & CPLB_VALID) {
- unsigned long this_addr = icplb_tbl[idx].addr;
+ if (icplb_tbl[cpu][idx].data & CPLB_VALID) {
+ unsigned long this_addr = icplb_tbl[cpu][idx].addr;
if (this_addr <= addr && this_addr + PAGE_SIZE > addr) {
addr += PAGE_SIZE;
break;
@@ -230,7 +204,7 @@ static noinline int icplb_miss(void)
i_data = CPLB_VALID | CPLB_PORTPRIO | PAGE_SIZE_4KB;
-#ifdef CONFIG_BFIN_ICACHE
+#ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
/*
* Normal RAM, and possibly the reserved memory area, are
* cacheable.
@@ -240,8 +214,25 @@ static noinline int icplb_miss(void)
i_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#endif
- if (addr >= physical_mem_end) {
- if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH
+ if (L2_LENGTH && addr >= L2_START && addr < L2_START + L2_LENGTH) {
+ addr = L2_START;
+ i_data = L2_IMEMORY;
+ } else if (addr >= physical_mem_end) {
+ if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) {
+ if (!(status & FAULT_USERSUPV)) {
+ unsigned long *mask = current_rwx_mask[cpu];
+
+ if (mask) {
+ int page = (addr - (ASYNC_BANK0_BASE - _ramend)) >> PAGE_SHIFT;
+ int idx = page >> 5;
+ int bit = 1 << (page & 31);
+
+ mask += 2 * page_mask_nelts;
+ if (mask[idx] & bit)
+ i_data |= CPLB_USER_RD;
+ }
+ }
+ } else if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH
&& (status & FAULT_USERSUPV)) {
addr &= ~(1 * 1024 * 1024 - 1);
i_data &= ~PAGE_SIZE_4KB;
@@ -250,6 +241,8 @@ static noinline int icplb_miss(void)
return CPLB_PROT_VIOL;
} else if (addr >= _ramend) {
i_data |= CPLB_USER_RD;
+ if (reserved_mem_icache_on)
+ i_data |= CPLB_L1_CHBL;
} else {
/*
* Two cases to distinguish - a supervisor access must
@@ -258,45 +251,45 @@ static noinline int icplb_miss(void)
* Otherwise, check the x bitmap of the current process.
*/
if (!(status & FAULT_USERSUPV)) {
- unsigned long *mask = current_rwx_mask;
+ unsigned long *mask = current_rwx_mask[cpu];
if (mask) {
int page = addr >> PAGE_SHIFT;
- int offs = page >> 5;
+ int idx = page >> 5;
int bit = 1 << (page & 31);
mask += 2 * page_mask_nelts;
- if (mask[offs] & bit)
+ if (mask[idx] & bit)
i_data |= CPLB_USER_RD;
}
}
}
- idx = evict_one_icplb();
+ idx = evict_one_icplb(cpu);
addr &= PAGE_MASK;
- icplb_tbl[idx].addr = addr;
- icplb_tbl[idx].data = i_data;
+ icplb_tbl[cpu][idx].addr = addr;
+ icplb_tbl[cpu][idx].data = i_data;
- disable_icplb();
+ _disable_icplb();
bfin_write32(ICPLB_DATA0 + idx * 4, i_data);
bfin_write32(ICPLB_ADDR0 + idx * 4, addr);
- enable_icplb();
+ _enable_icplb();
return 0;
}
-static noinline int dcplb_protection_fault(void)
+MGR_ATTR static noinline int dcplb_protection_fault(unsigned int cpu)
{
int status = bfin_read_DCPLB_STATUS();
- nr_dcplb_prot++;
+ nr_dcplb_prot[cpu]++;
if (status & FAULT_RW) {
int idx = faulting_cplb_index(status);
- unsigned long data = dcplb_tbl[idx].data;
+ unsigned long data = dcplb_tbl[cpu][idx].data;
if (!(data & CPLB_WT) && !(data & CPLB_DIRTY) &&
write_permitted(status, data)) {
data |= CPLB_DIRTY;
- dcplb_tbl[idx].data = data;
+ dcplb_tbl[cpu][idx].data = data;
bfin_write32(DCPLB_DATA0 + idx * 4, data);
return 0;
}
@@ -304,67 +297,83 @@ static noinline int dcplb_protection_fault(void)
return CPLB_PROT_VIOL;
}
-int cplb_hdr(int seqstat, struct pt_regs *regs)
+MGR_ATTR int cplb_hdr(int seqstat, struct pt_regs *regs)
{
int cause = seqstat & 0x3f;
+ unsigned int cpu = raw_smp_processor_id();
switch (cause) {
case 0x23:
- return dcplb_protection_fault();
+ return dcplb_protection_fault(cpu);
case 0x2C:
- return icplb_miss();
+ return icplb_miss(cpu);
case 0x26:
- return dcplb_miss();
+ return dcplb_miss(cpu);
default:
return 1;
}
}
-void flush_switched_cplbs(void)
+void flush_switched_cplbs(unsigned int cpu)
{
int i;
+ unsigned long flags;
- nr_cplb_flush++;
+ nr_cplb_flush[cpu]++;
- disable_icplb();
+ flags = hard_local_irq_save();
+ _disable_icplb();
for (i = first_switched_icplb; i < MAX_CPLBS; i++) {
- icplb_tbl[i].data = 0;
+ icplb_tbl[cpu][i].data = 0;
bfin_write32(ICPLB_DATA0 + i * 4, 0);
}
- enable_icplb();
+ _enable_icplb();
- disable_dcplb();
+ _disable_dcplb();
for (i = first_switched_dcplb; i < MAX_CPLBS; i++) {
- dcplb_tbl[i].data = 0;
+ dcplb_tbl[cpu][i].data = 0;
bfin_write32(DCPLB_DATA0 + i * 4, 0);
}
- enable_dcplb();
+ _enable_dcplb();
+ hard_local_irq_restore(flags);
+
}
-void set_mask_dcplbs(unsigned long *masks)
+void set_mask_dcplbs(unsigned long *masks, unsigned int cpu)
{
int i;
unsigned long addr = (unsigned long)masks;
unsigned long d_data;
- current_rwx_mask = masks;
+ unsigned long flags;
- if (!masks)
+ if (!masks) {
+ current_rwx_mask[cpu] = masks;
return;
+ }
- d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
-#ifdef CONFIG_BFIN_DCACHE
- d_data |= CPLB_L1_CHBL;
-#ifdef CONFIG_BFIN_WT
- d_data |= CPLB_L1_AOW | CPLB_WT;
-#endif
+ flags = hard_local_irq_save();
+ current_rwx_mask[cpu] = masks;
+
+ if (L2_LENGTH && addr >= L2_START && addr < L2_START + L2_LENGTH) {
+ addr = L2_START;
+ d_data = L2_DMEMORY;
+ } else {
+ d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
+#ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE
+ d_data |= CPLB_L1_CHBL;
+# ifdef CONFIG_BFIN_EXTMEM_WRITETHROUGH
+ d_data |= CPLB_L1_AOW | CPLB_WT;
+# endif
#endif
+ }
- disable_dcplb();
+ _disable_dcplb();
for (i = first_mask_dcplb; i < first_switched_dcplb; i++) {
- dcplb_tbl[i].addr = addr;
- dcplb_tbl[i].data = d_data;
+ dcplb_tbl[cpu][i].addr = addr;
+ dcplb_tbl[cpu][i].data = d_data;
bfin_write32(DCPLB_DATA0 + i * 4, d_data);
bfin_write32(DCPLB_ADDR0 + i * 4, addr);
addr += PAGE_SIZE;
}
- enable_dcplb();
+ _enable_dcplb();
+ hard_local_irq_restore(flags);
}
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