Merge tag 'for-3.16/bcm-cleanup' of git://github.com/broadcom/mach-bcm into next/cleanup

* Clean up mach-bcm config and build targets
* Clean up bcm281xx/21664 SMC code
* Clean up bcm281xx/21664 L2C code

* tag 'for-3.16/bcm-cleanup' of git://github.com/broadcom/mach-bcm:
  ARM: bcm: rename "kona.h" and "kona.c"
  ARM: bcm: rewrite commentary for bcm_kona_do_smc()
  ARM: bcm: use inline assembly for "smc" request
  ARM: bcm: tidy up a few includes
  ARM: bcm: config option for l2 cache support
  ARM: bcm: don't special-case CPU 0 in bcm_kona_smc()
  ARM: bcm: have bcm_kona_smc() return request result
  ARM: bcm: clean up SMC code
  ARM: bcm: err, don't BUG() on SMC init failures
  ARM: bcm: use memory accessors for ioremapped area
  ARM: bcm: clean up config and build targets

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Conflicts:
	arch/arm/mach-bcm/Kconfig

9 files changed, 170 insertions, 149 deletions

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index 9f19636fea2..b8cc9e8992f 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -10,21 +10,51 @@ if ARCH_BCM
 menu "Broadcom SoC Selection"
 
 config ARCH_BCM_MOBILE
-	bool "Broadcom Mobile SoC" if ARCH_MULTI_V7
+	bool "Broadcom Mobile SoC Support" if ARCH_MULTI_V7
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_ERRATA_754322
 	select ARM_ERRATA_764369 if SMP
 	select ARM_GIC
 	select GPIO_BCM_KONA
 	select TICK_ONESHOT
-	select CACHE_L2X0
 	select HAVE_ARM_ARCH_TIMER
 	select PINCTRL
 	help
 	  This enables support for systems based on Broadcom mobile SoCs.
-	  It currently supports the 'BCM281XX' family, which includes
-	  BCM11130, BCM11140, BCM11351, BCM28145 and
-	  BCM28155 variants.
+
+if ARCH_BCM_MOBILE
+
+menu "Broadcom Mobile SoC Selection"
+
+config ARCH_BCM_281XX
+	bool "Broadcom BCM281XX SoC family"
+	default y
+	help
+	  Enable support for the the BCM281XX family, which includes
+	  BCM11130, BCM11140, BCM11351, BCM28145 and BCM28155
+	  variants.
+
+config ARCH_BCM_21664
+	bool "Broadcom BCM21664 SoC family"
+	default y
+	help
+	  Enable support for the the BCM21664 family, which includes
+	  BCM21663 and BCM21664 variants.
+
+config ARCH_BCM_MOBILE_L2_CACHE
+	bool "Broadcom mobile SoC level 2 cache support"
+	depends on (ARCH_BCM_281XX || ARCH_BCM_21664)
+	default y
+	select CACHE_L2X0
+	select ARCH_BCM_MOBILE_SMC
+
+config ARCH_BCM_MOBILE_SMC
+	bool
+	depends on ARCH_BCM_281XX || ARCH_BCM_21664
+
+endmenu
+
+endif
 
 config ARCH_BCM2835
 	bool "Broadcom BCM2835 family" if ARCH_MULTI_V6
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
index a326b28c440..73129211497 100644
--- a/arch/arm/mach-bcm/Makefile
+++ b/arch/arm/mach-bcm/Makefile
@@ -10,10 +10,23 @@
 # of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 
-obj-$(CONFIG_ARCH_BCM_MOBILE)	:= board_bcm281xx.o board_bcm21664.o \
-				bcm_kona_smc.o bcm_kona_smc_asm.o kona.o
+# BCM281XX
+obj-$(CONFIG_ARCH_BCM_281XX)	+= board_bcm281xx.o
+
+# BCM21664
+obj-$(CONFIG_ARCH_BCM_21664)	+= board_bcm21664.o
+
+# BCM281XX and BCM21664 L2 cache control
+obj-$(CONFIG_ARCH_BCM_MOBILE_L2_CACHE) += kona_l2_cache.o
+
+# Support for secure monitor traps
+obj-$(CONFIG_ARCH_BCM_MOBILE_SMC) += bcm_kona_smc.o
+ifeq ($(call as-instr,.arch_extension sec,as_has_sec),as_has_sec)
+CFLAGS_bcm_kona_smc.o		+= -Wa,-march=armv7-a+sec -DREQUIRES_SEC
+endif
+
+# BCM2835
 obj-$(CONFIG_ARCH_BCM2835)	+= board_bcm2835.o
 
-plus_sec := $(call as-instr,.arch_extension sec,+sec)
-AFLAGS_bcm_kona_smc_asm.o	:=-Wa,-march=armv7-a$(plus_sec)
+# BCM5301X
 obj-$(CONFIG_ARCH_BCM_5301X)	+= bcm_5301x.o
diff --git a/arch/arm/mach-bcm/bcm_kona_smc.c b/arch/arm/mach-bcm/bcm_kona_smc.c
index 5e31e918f32..a55a7ecf146 100644
--- a/arch/arm/mach-bcm/bcm_kona_smc.c
+++ b/arch/arm/mach-bcm/bcm_kona_smc.c
@@ -21,11 +21,8 @@
 
 #include "bcm_kona_smc.h"
 
-struct secure_bridge_data {
-	void __iomem *bounce;		/* virtual address */
-	u32 __iomem buffer_addr;	/* physical address */
-	int initialized;
-} bridge_data;
+static u32		bcm_smc_buffer_phys;	/* physical address */
+static void __iomem	*bcm_smc_buffer;	/* virtual address */
 
 struct bcm_kona_smc_data {
 	unsigned service_id;
@@ -33,6 +30,7 @@ struct bcm_kona_smc_data {
 	unsigned arg1;
 	unsigned arg2;
 	unsigned arg3;
+	unsigned result;
 };
 
 static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
@@ -41,59 +39,125 @@ static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
 	{},
 };
 
-/* Map in the bounce area */
+/* Map in the args buffer area */
 int __init bcm_kona_smc_init(void)
 {
 	struct device_node *node;
+	const __be32 *prop_val;
+	u64 prop_size = 0;
+	unsigned long buffer_size;
+	u32 buffer_phys;
 
 	/* Read buffer addr and size from the device tree node */
 	node = of_find_matching_node(NULL, bcm_kona_smc_ids);
 	if (!node)
 		return -ENODEV;
 
-	/* Don't care about size or flags of the DT node */
-	bridge_data.buffer_addr =
-		be32_to_cpu(*of_get_address(node, 0, NULL, NULL));
-	BUG_ON(!bridge_data.buffer_addr);
+	prop_val = of_get_address(node, 0, &prop_size, NULL);
+	if (!prop_val)
+		return -EINVAL;
 
-	bridge_data.bounce = of_iomap(node, 0);
-	BUG_ON(!bridge_data.bounce);
+	/* We assume space for four 32-bit arguments */
+	if (prop_size < 4 * sizeof(u32) || prop_size > (u64)ULONG_MAX)
+		return -EINVAL;
+	buffer_size = (unsigned long)prop_size;
 
-	bridge_data.initialized = 1;
+	buffer_phys = be32_to_cpup(prop_val);
+	if (!buffer_phys)
+		return -EINVAL;
+
+	bcm_smc_buffer = ioremap(buffer_phys, buffer_size);
+	if (!bcm_smc_buffer)
+		return -ENOMEM;
+	bcm_smc_buffer_phys = buffer_phys;
 
 	pr_info("Kona Secure API initialized\n");
 
 	return 0;
 }
 
+/*
+ * int bcm_kona_do_smc(u32 service_id, u32 buffer_addr)
+ *
+ * Only core 0 can run the secure monitor code.  If an "smc" request
+ * is initiated on a different core it must be redirected to core 0
+ * for execution.  We rely on the caller to handle this.
+ *
+ * Each "smc" request supplies a service id and the address of a
+ * buffer containing parameters related to the service to be
+ * performed.  A flags value defines the behavior of the level 2
+ * cache and interrupt handling while the secure monitor executes.
+ *
+ * Parameters to the "smc" request are passed in r4-r6 as follows:
+ *     r4	service id
+ *     r5	flags (SEC_ROM_*)
+ *     r6	physical address of buffer with other parameters
+ *
+ * Execution of an "smc" request produces two distinct results.
+ *
+ * First, the secure monitor call itself (regardless of the specific
+ * service request) can succeed, or can produce an error.  When an
+ * "smc" request completes this value is found in r12; it should
+ * always be SEC_EXIT_NORMAL.
+ *
+ * In addition, the particular service performed produces a result.
+ * The values that should be expected depend on the service.  We
+ * therefore return this value to the caller, so it can handle the
+ * request result appropriately.  This result value is found in r0
+ * when the "smc" request completes.
+ */
+static int bcm_kona_do_smc(u32 service_id, u32 buffer_phys)
+{
+	register u32 ip asm("ip");	/* Also called r12 */
+	register u32 r0 asm("r0");
+	register u32 r4 asm("r4");
+	register u32 r5 asm("r5");
+	register u32 r6 asm("r6");
+
+	r4 = service_id;
+	r5 = 0x3;		/* Keep IRQ and FIQ off in SM */
+	r6 = buffer_phys;
+
+	asm volatile (
+		/* Make sure we got the registers we want */
+		__asmeq("%0", "ip")
+		__asmeq("%1", "r0")
+		__asmeq("%2", "r4")
+		__asmeq("%3", "r5")
+		__asmeq("%4", "r6")
+#ifdef REQUIRES_SEC
+		".arch_extension sec\n"
+#endif
+		"	smc    #0\n"
+		: "=r" (ip), "=r" (r0)
+		: "r" (r4), "r" (r5), "r" (r6)
+		: "r1", "r2", "r3", "r7", "lr");
+
+	BUG_ON(ip != SEC_EXIT_NORMAL);
+
+	return r0;
+}
+
 /* __bcm_kona_smc() should only run on CPU 0, with pre-emption disabled */
 static void __bcm_kona_smc(void *info)
 {
 	struct bcm_kona_smc_data *data = info;
-	u32 *args = bridge_data.bounce;
-	int rc = 0;
+	u32 *args = bcm_smc_buffer;
 
-	/* Must run on CPU 0 */
 	BUG_ON(smp_processor_id() != 0);
+	BUG_ON(!args);
 
-	/* Check map in the bounce area */
-	BUG_ON(!bridge_data.initialized);
-
-	/* Copy one 32 bit word into the bounce area */
-	args[0] = data->arg0;
-	args[1] = data->arg1;
-	args[2] = data->arg2;
-	args[3] = data->arg3;
+	/* Copy the four 32 bit argument values into the bounce area */
+	writel_relaxed(data->arg0, args++);
+	writel_relaxed(data->arg1, args++);
+	writel_relaxed(data->arg2, args++);
+	writel(data->arg3, args);
 
 	/* Flush caches for input data passed to Secure Monitor */
-	if (data->service_id != SSAPI_BRCM_START_VC_CORE)
-		flush_cache_all();
-
-	/* Trap into Secure Monitor */
-	rc = bcm_kona_smc_asm(data->service_id, bridge_data.buffer_addr);
+	flush_cache_all();
 
-	if (rc != SEC_ROM_RET_OK)
-		pr_err("Secure Monitor call failed (0x%x)!\n", rc);
+	/* Trap into Secure Monitor and record the request result */
+	data->result = bcm_kona_do_smc(data->service_id, bcm_smc_buffer_phys);
 }
 
 unsigned bcm_kona_smc(unsigned service_id, unsigned arg0, unsigned arg1,
@@ -106,17 +170,13 @@ unsigned bcm_kona_smc(unsigned service_id, unsigned arg0, unsigned arg1,
 	data.arg1 = arg1;
 	data.arg2 = arg2;
 	data.arg3 = arg3;
+	data.result = 0;
 
 	/*
 	 * Due to a limitation of the secure monitor, we must use the SMP
 	 * infrastructure to forward all secure monitor calls to Core 0.
 	 */
-	if (get_cpu() != 0)
-		smp_call_function_single(0, __bcm_kona_smc, (void *)&data, 1);
-	else
-		__bcm_kona_smc(&data);
+	smp_call_function_single(0, __bcm_kona_smc, &data, 1);
 
-	put_cpu();
-
-	return 0;
+	return data.result;
 }
diff --git a/arch/arm/mach-bcm/bcm_kona_smc.h b/arch/arm/mach-bcm/bcm_kona_smc.h
index d098a7e7674..2e29ec67e41 100644
--- a/arch/arm/mach-bcm/bcm_kona_smc.h
+++ b/arch/arm/mach-bcm/bcm_kona_smc.h
@@ -15,55 +15,12 @@
 #define BCM_KONA_SMC_H
 
 #include <linux/types.h>
-#define FLAGS	(SEC_ROM_ICACHE_ENABLE_MASK | SEC_ROM_DCACHE_ENABLE_MASK | \
-			SEC_ROM_IRQ_ENABLE_MASK | SEC_ROM_FIQ_ENABLE_MASK)
 
-/*!
- * Definitions for IRQ & FIQ Mask for ARM
- */
-
-#define FIQ_IRQ_MASK						0xC0
-#define FIQ_MASK						0x40
-#define IRQ_MASK						0x80
-
-/*!
- * Secure Mode FLAGs
- */
-
-/* When set, enables ICache within the secure mode */
-#define SEC_ROM_ICACHE_ENABLE_MASK                        0x00000001
-
-/* When set, enables DCache within the secure mode */
-#define SEC_ROM_DCACHE_ENABLE_MASK                        0x00000002
-
-/* When set, enables IRQ within the secure mode */
-#define SEC_ROM_IRQ_ENABLE_MASK                           0x00000004
-
-/* When set, enables FIQ within the secure mode */
-#define SEC_ROM_FIQ_ENABLE_MASK                           0x00000008
-
-/* When set, enables Unified L2 cache within the secure mode */
-#define SEC_ROM_UL2_CACHE_ENABLE_MASK                     0x00000010
-
-/* Broadcom Secure Service API Service IDs */
-#define SSAPI_DORMANT_ENTRY_SERV                          0x01000000
-#define SSAPI_PUBLIC_OTP_SERV                             0x01000001
-#define SSAPI_ENABLE_L2_CACHE                             0x01000002
-#define SSAPI_DISABLE_L2_CACHE                            0x01000003
-#define SSAPI_WRITE_SCU_STATUS                            0x01000004
-#define SSAPI_WRITE_PWR_GATE                              0x01000005
-
-/* Broadcom Secure Service API Return Codes */
+/* Broadcom Secure Service API service IDs, return codes, and exit codes */
+#define SSAPI_ENABLE_L2_CACHE		0x01000002
 #define SEC_ROM_RET_OK			0x00000001
-#define SEC_ROM_RET_FAIL		0x00000009
-
-#define SSAPI_RET_FROM_INT_SERV		0x4
 #define SEC_EXIT_NORMAL			0x1
 
-#define SSAPI_ROW_AES			0x0E000006
-#define SSAPI_BRCM_START_VC_CORE	0x0E000008
-
-#ifndef	__ASSEMBLY__
 extern int __init bcm_kona_smc_init(void);
 
 extern unsigned bcm_kona_smc(unsigned service_id,
@@ -72,9 +29,4 @@ extern unsigned bcm_kona_smc(unsigned service_id,
 			     unsigned arg2,
 			     unsigned arg3);
 
-extern int bcm_kona_smc_asm(u32 service_id,
-			    u32 buffer_addr);
-
-#endif	/* __ASSEMBLY__ */
-
 #endif /* BCM_KONA_SMC_H */
diff --git a/arch/arm/mach-bcm/bcm_kona_smc_asm.S b/arch/arm/mach-bcm/bcm_kona_smc_asm.S
deleted file mode 100644
index a1608480d60..00000000000
--- a/arch/arm/mach-bcm/bcm_kona_smc_asm.S
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * Copyright (C) 2013 Broadcom Corporation
- *
- * 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 version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/linkage.h>
-#include "bcm_kona_smc.h"
-
-/*
- * int bcm_kona_smc_asm(u32 service_id, u32 buffer_addr)
- */
-
-ENTRY(bcm_kona_smc_asm)
-	stmfd	sp!, {r4-r12, lr}
-	mov	r4, r0		@ service_id
-	mov	r5, #3		@ Keep IRQ and FIQ off in SM
-	/*
-	 * Since interrupts are disabled in the open mode, we must keep
-	 * interrupts disabled in secure mode by setting R5=0x3. If interrupts
-	 * are enabled in open mode, we can set R5=0x0 to allow interrupts in
-	 * secure mode.  If we did this, the secure monitor would return back
-	 * control to the open mode to handle the interrupt prior to completing
-	 * the secure service. If this happened, R12 would not be
-	 * SEC_EXIT_NORMAL and we would need to call SMC again after resetting
-	 * R5 (it gets clobbered by the secure monitor) and setting R4 to
-	 * SSAPI_RET_FROM_INT_SERV to indicate that we want the secure monitor
-	 * to finish up the previous uncompleted secure service.
-	 */
-	mov	r6, r1		@ buffer_addr
-	smc	#0
-	/* Check r12 for SEC_EXIT_NORMAL here if interrupts are enabled */
-	ldmfd	sp!, {r4-r12, pc}
-ENDPROC(bcm_kona_smc_asm)
diff --git a/arch/arm/mach-bcm/board_bcm21664.c b/arch/arm/mach-bcm/board_bcm21664.c
index acc1573fd00..f0521cc0640 100644
--- a/arch/arm/mach-bcm/board_bcm21664.c
+++ b/arch/arm/mach-bcm/board_bcm21664.c
@@ -11,14 +11,13 @@
  * GNU General Public License for more details.
  */
 
-#include <linux/clocksource.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
+#include <linux/io.h>
 
 #include <asm/mach/arch.h>
 
-#include "bcm_kona_smc.h"
-#include "kona.h"
+#include "kona_l2_cache.h"
 
 #define RSTMGR_DT_STRING		"brcm,bcm21664-resetmgr"
 
diff --git a/arch/arm/mach-bcm/board_bcm281xx.c b/arch/arm/mach-bcm/board_bcm281xx.c
index 6be54c10f8c..1ac59fc0cb1 100644
--- a/arch/arm/mach-bcm/board_bcm281xx.c
+++ b/arch/arm/mach-bcm/board_bcm281xx.c
@@ -17,7 +17,7 @@
 
 #include <asm/mach/arch.h>
 
-#include "kona.h"
+#include "kona_l2_cache.h"
 
 #define SECWDOG_OFFSET			0x00000000
 #define SECWDOG_RESERVED_MASK		0xe2000000
diff --git a/arch/arm/mach-bcm/kona.c b/arch/arm/mach-bcm/kona_l2_cache.c
index 768bc2837bf..b31970377c2 100644
--- a/arch/arm/mach-bcm/kona.c
+++ b/arch/arm/mach-bcm/kona_l2_cache.c
@@ -11,19 +11,18 @@
  * GNU General Public License for more details.
  */
 
-#include <linux/of_platform.h>
+
+#include <linux/init.h>
+#include <linux/printk.h>
 #include <asm/hardware/cache-l2x0.h>
 
 #include "bcm_kona_smc.h"
-#include "kona.h"
 
 void __init kona_l2_cache_init(void)
 {
+	unsigned int result;
 	int ret;
 
-	if (!IS_ENABLED(CONFIG_CACHE_L2X0))
-		return;
-
 	ret = bcm_kona_smc_init();
 	if (ret) {
 		pr_info("Secure API not available (%d). Skipping L2 init.\n",
@@ -31,7 +30,12 @@ void __init kona_l2_cache_init(void)
 		return;
 	}
 
-	bcm_kona_smc(SSAPI_ENABLE_L2_CACHE, 0, 0, 0, 0);
+	result = bcm_kona_smc(SSAPI_ENABLE_L2_CACHE, 0, 0, 0, 0);
+	if (result != SEC_ROM_RET_OK) {
+		pr_err("Secure Monitor call failed (%u)! Skipping L2 init.\n",
+			result);
+		return;
+	}
 
 	/*
 	 * The aux_val and aux_mask have no effect since L2 cache is already
diff --git a/arch/arm/mach-bcm/kona.h b/arch/arm/mach-bcm/kona_l2_cache.h
index 3a7a017c29c..46f84a95ab1 100644
--- a/arch/arm/mach-bcm/kona.h
+++ b/arch/arm/mach-bcm/kona_l2_cache.h
@@ -11,4 +11,8 @@
  * GNU General Public License for more details.
  */
 
-void __init kona_l2_cache_init(void);
+#ifdef CONFIG_ARCH_BCM_MOBILE_L2_CACHE
+void	kona_l2_cache_init(void);
+#else
+#define kona_l2_cache_init() ((void)0)
+#endif