ARM: OMAP4: remove dead kconfig option OMAP4_ERRATA_I688

The Kconfig-Option OMAP4_ERRATA_I688 is never visible due to a
contradiction in it's dependencies.
The option requires ARCH_MULTIPLATFORM to be 'disabled'. However, an
enclosing menu requires either ARCH_MULTI_V6 or ARCH_MULTI_V7 to be
enabled. These options inherit a dependency from an enclosing menu,
that requires ARCH_MULTIPLATFORM to be 'enabled'.
This is a contradiction and made this option also unavailable for
non-multiplatform configurations.

Since there are no selects on OMAP4_ERRATA_I688, which would ignore
dependencies, the code related to that option is dead and can be
removed.

This (logical) defect has been found with the undertaker tool.
(https://undertaker.cs.fau.de)

Signed-off-by: Stefan Hengelein <stefan.hengelein@fau.de>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

7 files changed, 0 insertions, 105 deletions

diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 2b8e47788062..c7f4d9a6b38c 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -278,27 +278,6 @@ config OMAP3_SDRC_AC_TIMING
           wish to say no.  Selecting yes without understanding what is
           going on could result in system crashes;
 
-config OMAP4_ERRATA_I688
-        bool "OMAP4 errata: Async Bridge Corruption"
-        depends on (ARCH_OMAP4 || SOC_OMAP5) && !ARCH_MULTIPLATFORM
-        select ARCH_HAS_BARRIERS
-        help
-          If a data is stalled inside asynchronous bridge because of back
-          pressure, it may be accepted multiple times, creating pointer
-          misalignment that will corrupt next transfers on that data path
-          until next reset of the system (No recovery procedure once the
-          issue is hit, the path remains consistently broken). Async bridge
-          can be found on path between MPU to EMIF and MPU to L3 interconnect.
-          This situation can happen only when the idle is initiated by a
-          Master Request Disconnection (which is trigged by software when
-          executing WFI on CPU).
-          The work-around for this errata needs all the initiators connected
-          through async bridge must ensure that data path is properly drained
-          before issuing WFI. This condition will be met if one Strongly ordered
-          access is performed to the target right before executing the WFI.
-          In MPU case, L3 T2ASYNC FIFO and DDR T2ASYNC FIFO needs to be drained.
-          IO barrier ensure that there is no synchronisation loss on initiators
-          operating on both interconnect port simultaneously.
 endmenu
 
 endif
diff --git a/arch/arm/mach-omap2/common.c b/arch/arm/mach-omap2/common.c
index 484cdadfb187..eae6a0e87c90 100644
--- a/arch/arm/mach-omap2/common.c
+++ b/arch/arm/mach-omap2/common.c
@@ -30,5 +30,4 @@ int __weak omap_secure_ram_reserve_memblock(void)
 void __init omap_reserve(void)
 {
         omap_secure_ram_reserve_memblock();
-        omap_barrier_reserve_memblock();
 }
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 46e24581d624..cf3cf22ecd42 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -200,9 +200,6 @@ void __init omap4_map_io(void);
 void __init omap5_map_io(void);
 void __init ti81xx_map_io(void);
 
-/* omap_barriers_init() is OMAP4 only */
-void omap_barriers_init(void);
-
 /**
  * omap_test_timeout - busy-loop, testing a condition
  * @cond: condition to test until it evaluates to true
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index c4871c55bd8b..1eeff6be260d 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -306,7 +306,6 @@ void __init am33xx_map_io(void)
 void __init omap4_map_io(void)
 {
         iotable_init(omap44xx_io_desc, ARRAY_SIZE(omap44xx_io_desc));
-        omap_barriers_init();
 }
 #endif
 
@@ -314,7 +313,6 @@ void __init omap4_map_io(void)
 void __init omap5_map_io(void)
 {
         iotable_init(omap54xx_io_desc, ARRAY_SIZE(omap54xx_io_desc));
-        omap_barriers_init();
 }
 #endif
 /*
diff --git a/arch/arm/mach-omap2/omap-secure.h b/arch/arm/mach-omap2/omap-secure.h
index dec2b05d184b..af2851fbcdf0 100644
--- a/arch/arm/mach-omap2/omap-secure.h
+++ b/arch/arm/mach-omap2/omap-secure.h
@@ -70,13 +70,6 @@ extern u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
 extern u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits);
 extern u32 rx51_secure_rng_call(u32 ptr, u32 count, u32 flag);
 
-#ifdef CONFIG_OMAP4_ERRATA_I688
-extern int omap_barrier_reserve_memblock(void);
-#else
-static inline void omap_barrier_reserve_memblock(void)
-{ }
-#endif
-
 #ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
 void set_cntfreq(void);
 #else
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index cee0fe1ee6ff..afaac9e25764 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -52,75 +52,6 @@ static void __iomem *twd_base;
 
 #define IRQ_LOCALTIMER          29
 
-#ifdef CONFIG_OMAP4_ERRATA_I688
-/* Used to implement memory barrier on DRAM path */
-#define OMAP4_DRAM_BARRIER_VA                   0xfe600000
-
-void __iomem *dram_sync, *sram_sync;
-
-static phys_addr_t paddr;
-static u32 size;
-
-void omap_bus_sync(void)
-{
-        if (dram_sync && sram_sync) {
-                writel_relaxed(readl_relaxed(dram_sync), dram_sync);
-                writel_relaxed(readl_relaxed(sram_sync), sram_sync);
-                isb();
-        }
-}
-EXPORT_SYMBOL(omap_bus_sync);
-
-static int __init omap4_sram_init(void)
-{
-        struct device_node *np;
-        struct gen_pool *sram_pool;
-
-        np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
-        if (!np)
-                pr_warn("%s:Unable to allocate sram needed to handle errata I688\n",
-                        __func__);
-        sram_pool = of_get_named_gen_pool(np, "sram", 0);
-        if (!sram_pool)
-                pr_warn("%s:Unable to get sram pool needed to handle errata I688\n",
-                        __func__);
-        else
-                sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);
-
-        return 0;
-}
-omap_arch_initcall(omap4_sram_init);
-
-/* Steal one page physical memory for barrier implementation */
-int __init omap_barrier_reserve_memblock(void)
-{
-
-        size = ALIGN(PAGE_SIZE, SZ_1M);
-        paddr = arm_memblock_steal(size, SZ_1M);
-
-        return 0;
-}
-
-void __init omap_barriers_init(void)
-{
-        struct map_desc dram_io_desc[1];
-
-        dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
-        dram_io_desc[0].pfn = __phys_to_pfn(paddr);
-        dram_io_desc[0].length = size;
-        dram_io_desc[0].type = MT_MEMORY_RW_SO;
-        iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
-        dram_sync = (void __iomem *) dram_io_desc[0].virtual;
-
-        pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
-                (long long) paddr, dram_io_desc[0].virtual);
-
-}
-#else
-void __init omap_barriers_init(void)
-{}
-#endif
-
 void gic_dist_disable(void)
 {
         if (gic_dist_base_addr)
diff --git a/arch/arm/mach-omap2/sleep44xx.S b/arch/arm/mach-omap2/sleep44xx.S
index b84a0122d823..ad1bb9431e94 100644
--- a/arch/arm/mach-omap2/sleep44xx.S
+++ b/arch/arm/mach-omap2/sleep44xx.S
@@ -333,11 +333,9 @@ ENDPROC(omap4_cpu_resume)
 
 #endif  /* defined(CONFIG_SMP) && defined(CONFIG_PM) */
 
-#ifndef CONFIG_OMAP4_ERRATA_I688
 ENTRY(omap_bus_sync)
         ret     lr
 ENDPROC(omap_bus_sync)
-#endif
 
 ENTRY(omap_do_wfi)
         stmfd   sp!, {lr}