Blackfin: cleanup sync handling when enabling/disabling cplbs

The handling of updating the [DI]MEM_CONTROL MMRs does not follow proper
sync procedures as laid out in the Blackfin programming manual.  So rather
than audit/fix every call location, create helper functions that do the
right things in order to safely update these MMRs.  Then convert all call
sites to use these new helper functions.

While we're fixing the code, drop the workaround for anomaly 05000125 as
that anomaly applies to old versions of silicon that we do not support.

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2 files changed, 15 insertions, 52 deletions

diff --git a/arch/blackfin/kernel/cplb-mpu/cacheinit.c b/arch/blackfin/kernel/cplb-mpu/cacheinit.c
index d5a86c3017f7..a082681faa8e 100644
--- a/arch/blackfin/kernel/cplb-mpu/cacheinit.c
+++ b/arch/blackfin/kernel/cplb-mpu/cacheinit.c
@@ -30,13 +30,14 @@ void __cpuinit bfin_icache_init(struct cplb_entry *icplb_tbl)
 	unsigned long ctrl;
 	int i;
 
-	SSYNC();
 	for (i = 0; i < MAX_CPLBS; i++) {
 		bfin_write32(ICPLB_ADDR0 + i * 4, icplb_tbl[i].addr);
 		bfin_write32(ICPLB_DATA0 + i * 4, icplb_tbl[i].data);
 	}
 	ctrl = bfin_read_IMEM_CONTROL();
 	ctrl |= IMC | ENICPLB;
+	/* CSYNC to ensure load store ordering */
+	CSYNC();
 	bfin_write_IMEM_CONTROL(ctrl);
 	SSYNC();
 }
@@ -48,7 +49,6 @@ void __cpuinit bfin_dcache_init(struct cplb_entry *dcplb_tbl)
 	unsigned long ctrl;
 	int i;
 
-	SSYNC();
 	for (i = 0; i < MAX_CPLBS; i++) {
 		bfin_write32(DCPLB_ADDR0 + i * 4, dcplb_tbl[i].addr);
 		bfin_write32(DCPLB_DATA0 + i * 4, dcplb_tbl[i].data);
@@ -63,6 +63,8 @@ void __cpuinit bfin_dcache_init(struct cplb_entry *dcplb_tbl)
 	 *  to port B
 	 */
 	ctrl |= DMEM_CNTR | PORT_PREF0 | (ANOMALY_05000287 ? PORT_PREF1 : 0);
+	/* CSYNC to ensure load store ordering */
+	CSYNC();
 	bfin_write_DMEM_CONTROL(ctrl);
 	SSYNC();
 }
diff --git a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c
index bcdfe9b0b71f..651b12773e09 100644
--- a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c
+++ b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c
@@ -22,6 +22,7 @@
 
 #include <asm/blackfin.h>
 #include <asm/cacheflush.h>
+#include <asm/cplb.h>
 #include <asm/cplbinit.h>
 #include <asm/mmu_context.h>
 
@@ -41,46 +42,6 @@ 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 disable_dcplb(void)
-{
-	unsigned long ctrl;
-	SSYNC();
-	ctrl = bfin_read_DMEM_CONTROL();
-	ctrl &= ~ENDCPLB;
-	bfin_write_DMEM_CONTROL(ctrl);
-	SSYNC();
-}
-
-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();
-}
-
-static inline void enable_icplb(void)
-{
-	unsigned long ctrl;
-	SSYNC();
-	ctrl = bfin_read_IMEM_CONTROL();
-	ctrl |= ENICPLB;
-	bfin_write_IMEM_CONTROL(ctrl);
-	SSYNC();
-}
-
 /*
  * Given the contents of the status register, return the index of the
  * CPLB that caused the fault.
@@ -198,10 +159,10 @@ static noinline int dcplb_miss(unsigned int cpu)
 	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;
 }
@@ -288,10 +249,10 @@ static noinline int icplb_miss(unsigned int cpu)
 	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;
 }
@@ -340,19 +301,19 @@ void flush_switched_cplbs(unsigned int cpu)
 	nr_cplb_flush[cpu]++;
 
 	local_irq_save_hw(flags);
-	disable_icplb();
+	_disable_icplb();
 	for (i = first_switched_icplb; i < MAX_CPLBS; i++) {
 		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[cpu][i].data = 0;
 		bfin_write32(DCPLB_DATA0 + i * 4, 0);
 	}
-	enable_dcplb();
+	_enable_dcplb();
 	local_irq_restore_hw(flags);
 
 }
@@ -385,7 +346,7 @@ void set_mask_dcplbs(unsigned long *masks, unsigned int cpu)
 #endif
 	}
 
-	disable_dcplb();
+	_disable_dcplb();
 	for (i = first_mask_dcplb; i < first_switched_dcplb; i++) {
 		dcplb_tbl[cpu][i].addr = addr;
 		dcplb_tbl[cpu][i].data = d_data;
@@ -393,6 +354,6 @@ void set_mask_dcplbs(unsigned long *masks, unsigned int cpu)
 		bfin_write32(DCPLB_ADDR0 + i * 4, addr);
 		addr += PAGE_SIZE;
 	}
-	enable_dcplb();
+	_enable_dcplb();
 	local_irq_restore_hw(flags);
 }