26 files changed, 359 insertions, 100 deletions

diff --git a/arch/arm/common/uengine.c b/arch/arm/common/uengine.c
index 95c8508c29b7..117cab30bd36 100644
--- a/arch/arm/common/uengine.c
+++ b/arch/arm/common/uengine.c
@@ -374,8 +374,8 @@ static int set_initial_registers(int uengine, struct ixp2000_uengine_code *c)
         u8 *ucode;
         int i;
 
-        gpr_a = kmalloc(128 * sizeof(u32), GFP_KERNEL);
-        gpr_b = kmalloc(128 * sizeof(u32), GFP_KERNEL);
+        gpr_a = kzalloc(128 * sizeof(u32), GFP_KERNEL);
+        gpr_b = kzalloc(128 * sizeof(u32), GFP_KERNEL);
         ucode = kmalloc(513 * 5, GFP_KERNEL);
         if (gpr_a == NULL || gpr_b == NULL || ucode == NULL) {
                 kfree(ucode);
@@ -388,8 +388,6 @@ static int set_initial_registers(int uengine, struct ixp2000_uengine_code *c)
         if (c->uengine_parameters & IXP2000_UENGINE_4_CONTEXTS)
                 per_ctx_regs = 32;
 
-        memset(gpr_a, 0, sizeof(gpr_a));
-        memset(gpr_b, 0, sizeof(gpr_b));
         for (i = 0; i < 256; i++) {
                 struct ixp2000_reg_value *r = c->initial_reg_values + i;
                 u32 *bank;
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index d645897652c2..29dec080a604 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -339,16 +339,6 @@ __pabt_svc:
         str     r1, [sp]                @ save the "real" r0 copied
                                         @ from the exception stack
 
-#if __LINUX_ARM_ARCH__ < 6 && !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
-#ifndef CONFIG_MMU
-#warning "NPTL on non MMU needs fixing"
-#else
-        @ make sure our user space atomic helper is aborted
-        cmp     r2, #TASK_SIZE
-        bichs   r3, r3, #PSR_Z_BIT
-#endif
-#endif
-
         @
         @ We are now ready to fill in the remaining blanks on the stack:
         @
@@ -372,9 +362,25 @@ __pabt_svc:
         zero_fp
         .endm
 
+        .macro  kuser_cmpxchg_check
+#if __LINUX_ARM_ARCH__ < 6 && !defined(CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG)
+#ifndef CONFIG_MMU
+#warning "NPTL on non MMU needs fixing"
+#else
+        @ Make sure our user space atomic helper is restarted
+        @ if it was interrupted in a critical region.  Here we
+        @ perform a quick test inline since it should be false
+        @ 99.9999% of the time.  The rest is done out of line.
+        cmp     r2, #TASK_SIZE
+        blhs    kuser_cmpxchg_fixup
+#endif
+#endif
+        .endm
+
         .align  5
 __dabt_usr:
         usr_entry
+        kuser_cmpxchg_check
 
         @
         @ Call the processor-specific abort handler:
@@ -404,6 +410,7 @@ __dabt_usr:
         .align  5
 __irq_usr:
         usr_entry
+        kuser_cmpxchg_check
 
 #ifdef CONFIG_TRACE_IRQFLAGS
         bl      trace_hardirqs_off
@@ -446,9 +453,9 @@ __und_usr:
         @
         @  r0 - instruction
         @
-1:      ldrt    r0, [r4]
         adr     r9, ret_from_exception
         adr     lr, __und_usr_unknown
+1:      ldrt    r0, [r4]
         @
         @ fallthrough to call_fpe
         @
@@ -669,7 +676,7 @@ __kuser_helper_start:
  *
  * Clobbered:
  *
- *      the Z flag might be lost
+ *      none
  *
  * Definition and user space usage example:
  *
@@ -730,9 +737,6 @@ __kuser_memory_barrier:				@ 0xffff0fa0
  *
  *    - This routine already includes memory barriers as needed.
  *
- *    - A failure might be transient, i.e. it is possible, although unlikely,
- *      that "failure" be returned even if *ptr == oldval.
- *
  * For example, a user space atomic_add implementation could look like this:
  *
  * #define atomic_add(ptr, val) \
@@ -769,46 +773,62 @@ __kuser_cmpxchg:				@ 0xffff0fc0
 
 #elif __LINUX_ARM_ARCH__ < 6
 
+#ifdef CONFIG_MMU
+
         /*
-         * Theory of operation:
-         *
-         * We set the Z flag before loading oldval. If ever an exception
-         * occurs we can not be sure the loaded value will still be the same
-         * when the exception returns, therefore the user exception handler
-         * will clear the Z flag whenever the interrupted user code was
-         * actually from the kernel address space (see the usr_entry macro).
-         *
-         * The post-increment on the str is used to prevent a race with an
-         * exception happening just after the str instruction which would
-         * clear the Z flag although the exchange was done.
+         * The only thing that can break atomicity in this cmpxchg
+         * implementation is either an IRQ or a data abort exception
+         * causing another process/thread to be scheduled in the middle
+         * of the critical sequence.  To prevent this, code is added to
+         * the IRQ and data abort exception handlers to set the pc back
+         * to the beginning of the critical section if it is found to be
+         * within that critical section (see kuser_cmpxchg_fixup).
          */
-#ifdef CONFIG_MMU
-        teq     ip, ip                  @ set Z flag
-        ldr     ip, [r2]                @ load current val
-        add     r3, r2, #1              @ prepare store ptr
-        teqeq   ip, r0                  @ compare with oldval if still allowed
-        streq   r1, [r3, #-1]!          @ store newval if still allowed
-        subs    r0, r2, r3              @ if r2 == r3 the str occured
+1:      ldr     r3, [r2]                        @ load current val
+        subs    r3, r3, r0                      @ compare with oldval
+2:      streq   r1, [r2]                        @ store newval if eq
+        rsbs    r0, r3, #0                      @ set return val and C flag
+        usr_ret lr
+
+        .text
+kuser_cmpxchg_fixup:
+        @ Called from kuser_cmpxchg_check macro.
+        @ r2 = address of interrupted insn (must be preserved).
+        @ sp = saved regs. r7 and r8 are clobbered.
+        @ 1b = first critical insn, 2b = last critical insn.
+        @ If r2 >= 1b and r2 <= 2b then saved pc_usr is set to 1b.
+        mov     r7, #0xffff0fff
+        sub     r7, r7, #(0xffff0fff - (0xffff0fc0 + (1b - __kuser_cmpxchg)))
+        subs    r8, r2, r7
+        rsbcss  r8, r8, #(2b - 1b)
+        strcs   r7, [sp, #S_PC]
+        mov     pc, lr
+        .previous
+
 #else
 #warning "NPTL on non MMU needs fixing"
         mov     r0, #-1
         adds    r0, r0, #0
-#endif
         usr_ret lr
+#endif
 
 #else
 
 #ifdef CONFIG_SMP
         mcr     p15, 0, r0, c7, c10, 5  @ dmb
 #endif
-        ldrex   r3, [r2]
+1:      ldrex   r3, [r2]
         subs    r3, r3, r0
         strexeq r3, r1, [r2]
+        teqeq   r3, #1
+        beq     1b
         rsbs    r0, r3, #0
+        /* beware -- each __kuser slot must be 8 instructions max */
 #ifdef CONFIG_SMP
-        mcr     p15, 0, r0, c7, c10, 5  @ dmb
-#endif
+        b       __kuser_memory_barrier
+#else
         usr_ret lr
+#endif
 
 #endif
 
@@ -829,7 +849,7 @@ __kuser_cmpxchg:				@ 0xffff0fc0
  *
  * Clobbered:
  *
- *      the Z flag might be lost
+ *      none
  *
  * Definition and user space usage example:
  *
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 4764bd9ccee8..c34db4e868fa 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -327,7 +327,7 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
                 if ((instr & hook->instr_mask) == hook->instr_val &&
                     (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) {
                         if (hook->fn(regs, instr) == 0) {
-                                spin_unlock_irq(&undef_lock);
+                                spin_unlock_irqrestore(&undef_lock, flags);
                                 return;
                         }
                 }
@@ -509,7 +509,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
          * existence.  Don't ever use this from user code.
          */
         case 0xfff0:
-        {
+        for (;;) {
                 extern void do_DataAbort(unsigned long addr, unsigned int fsr,
                                          struct pt_regs *regs);
                 unsigned long val;
@@ -545,7 +545,6 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
                 up_read(&mm->mmap_sem);
                 /* simulate a write access fault */
                 do_DataAbort(addr, 15 + (1 << 11), regs);
-                return -1;
         }
 #endif
 
diff --git a/arch/arm/mach-at91/at91rm9200_devices.c b/arch/arm/mach-at91/at91rm9200_devices.c
index 0417c165d50d..9296833f91cc 100644
--- a/arch/arm/mach-at91/at91rm9200_devices.c
+++ b/arch/arm/mach-at91/at91rm9200_devices.c
@@ -14,6 +14,7 @@
 #include <asm/mach/map.h>
 
 #include <linux/platform_device.h>
+#include <linux/i2c-gpio.h>
 
 #include <asm/arch/board.h>
 #include <asm/arch/gpio.h>
@@ -435,7 +436,40 @@ void __init at91_add_device_nand(struct at91_nand_data *data) {}
  *  TWI (i2c)
  * -------------------------------------------------------------------- */
 
-#if defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
+/*
+ * Prefer the GPIO code since the TWI controller isn't robust
+ * (gets overruns and underruns under load) and can only issue
+ * repeated STARTs in one scenario (the driver doesn't yet handle them).
+ */
+#if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
+
+static struct i2c_gpio_platform_data pdata = {
+        .sda_pin                = AT91_PIN_PA25,
+        .sda_is_open_drain      = 1,
+        .scl_pin                = AT91_PIN_PA26,
+        .scl_is_open_drain      = 1,
+        .udelay                 = 2,            /* ~100 kHz */
+};
+
+static struct platform_device at91rm9200_twi_device = {
+        .name                   = "i2c-gpio",
+        .id                     = -1,
+        .dev.platform_data      = &pdata,
+};
+
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
+{
+        at91_set_GPIO_periph(AT91_PIN_PA25, 1);         /* TWD (SDA) */
+        at91_set_multi_drive(AT91_PIN_PA25, 1);
+
+        at91_set_GPIO_periph(AT91_PIN_PA26, 1);         /* TWCK (SCL) */
+        at91_set_multi_drive(AT91_PIN_PA26, 1);
+
+        i2c_register_board_info(0, devices, nr_devices);
+        platform_device_register(&at91rm9200_twi_device);
+}
+
+#elif defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
 
 static struct resource twi_resources[] = {
         [0] = {
@@ -457,7 +491,7 @@ static struct platform_device at91rm9200_twi_device = {
         .num_resources  = ARRAY_SIZE(twi_resources),
 };
 
-void __init at91_add_device_i2c(void)
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
 {
         /* pins used for TWI interface */
         at91_set_A_periph(AT91_PIN_PA25, 0);            /* TWD */
@@ -466,10 +500,11 @@ void __init at91_add_device_i2c(void)
         at91_set_A_periph(AT91_PIN_PA26, 0);            /* TWCK */
         at91_set_multi_drive(AT91_PIN_PA26, 1);
 
+        i2c_register_board_info(0, devices, nr_devices);
         platform_device_register(&at91rm9200_twi_device);
 }
 #else
-void __init at91_add_device_i2c(void) {}
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices) {}
 #endif
 
 
diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index ffd3154c1e54..3091bf47d8c9 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -13,6 +13,7 @@
 #include <asm/mach/map.h>
 
 #include <linux/platform_device.h>
+#include <linux/i2c-gpio.h>
 
 #include <asm/arch/board.h>
 #include <asm/arch/gpio.h>
@@ -352,7 +353,41 @@ void __init at91_add_device_nand(struct at91_nand_data *data) {}
  *  TWI (i2c)
  * -------------------------------------------------------------------- */
 
-#if defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
+/*
+ * Prefer the GPIO code since the TWI controller isn't robust
+ * (gets overruns and underruns under load) and can only issue
+ * repeated STARTs in one scenario (the driver doesn't yet handle them).
+ */
+
+#if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
+
+static struct i2c_gpio_platform_data pdata = {
+        .sda_pin                = AT91_PIN_PA23,
+        .sda_is_open_drain      = 1,
+        .scl_pin                = AT91_PIN_PA24,
+        .scl_is_open_drain      = 1,
+        .udelay                 = 2,            /* ~100 kHz */
+};
+
+static struct platform_device at91sam9260_twi_device = {
+        .name                   = "i2c-gpio",
+        .id                     = -1,
+        .dev.platform_data      = &pdata,
+};
+
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
+{
+        at91_set_GPIO_periph(AT91_PIN_PA23, 1);         /* TWD (SDA) */
+        at91_set_multi_drive(AT91_PIN_PA23, 1);
+
+        at91_set_GPIO_periph(AT91_PIN_PA24, 1);         /* TWCK (SCL) */
+        at91_set_multi_drive(AT91_PIN_PA24, 1);
+
+        i2c_register_board_info(0, devices, nr_devices);
+        platform_device_register(&at91sam9260_twi_device);
+}
+
+#elif defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
 
 static struct resource twi_resources[] = {
         [0] = {
@@ -374,7 +409,7 @@ static struct platform_device at91sam9260_twi_device = {
         .num_resources  = ARRAY_SIZE(twi_resources),
 };
 
-void __init at91_add_device_i2c(void)
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
 {
         /* pins used for TWI interface */
         at91_set_A_periph(AT91_PIN_PA23, 0);            /* TWD */
@@ -383,10 +418,11 @@ void __init at91_add_device_i2c(void)
         at91_set_A_periph(AT91_PIN_PA24, 0);            /* TWCK */
         at91_set_multi_drive(AT91_PIN_PA24, 1);
 
+        i2c_register_board_info(0, devices, nr_devices);
         platform_device_register(&at91sam9260_twi_device);
 }
 #else
-void __init at91_add_device_i2c(void) {}
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices) {}
 #endif
 
 
diff --git a/arch/arm/mach-at91/at91sam9261_devices.c b/arch/arm/mach-at91/at91sam9261_devices.c
index 3576595b4941..64979a9023c2 100644
--- a/arch/arm/mach-at91/at91sam9261_devices.c
+++ b/arch/arm/mach-at91/at91sam9261_devices.c
@@ -14,7 +14,9 @@
 #include <asm/mach/map.h>
 
 #include <linux/platform_device.h>
+#include <linux/i2c-gpio.h>
 
+#include <linux/fb.h>
 #include <video/atmel_lcdc.h>
 
 #include <asm/arch/board.h>
@@ -275,7 +277,40 @@ void __init at91_add_device_nand(struct at91_nand_data *data) {}
  *  TWI (i2c)
  * -------------------------------------------------------------------- */
 
-#if defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
+/*
+ * Prefer the GPIO code since the TWI controller isn't robust
+ * (gets overruns and underruns under load) and can only issue
+ * repeated STARTs in one scenario (the driver doesn't yet handle them).
+ */
+#if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
+
+static struct i2c_gpio_platform_data pdata = {
+        .sda_pin                = AT91_PIN_PA7,
+        .sda_is_open_drain      = 1,
+        .scl_pin                = AT91_PIN_PA8,
+        .scl_is_open_drain      = 1,
+        .udelay                 = 2,            /* ~100 kHz */
+};
+
+static struct platform_device at91sam9261_twi_device = {
+        .name                   = "i2c-gpio",
+        .id                     = -1,
+        .dev.platform_data      = &pdata,
+};
+
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
+{
+        at91_set_GPIO_periph(AT91_PIN_PA7, 1);          /* TWD (SDA) */
+        at91_set_multi_drive(AT91_PIN_PA7, 1);
+
+        at91_set_GPIO_periph(AT91_PIN_PA8, 1);          /* TWCK (SCL) */
+        at91_set_multi_drive(AT91_PIN_PA8, 1);
+
+        i2c_register_board_info(0, devices, nr_devices);
+        platform_device_register(&at91sam9261_twi_device);
+}
+
+#elif defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
 
 static struct resource twi_resources[] = {
         [0] = {
@@ -297,7 +332,7 @@ static struct platform_device at91sam9261_twi_device = {
         .num_resources  = ARRAY_SIZE(twi_resources),
 };
 
-void __init at91_add_device_i2c(void)
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
 {
         /* pins used for TWI interface */
         at91_set_A_periph(AT91_PIN_PA7, 0);             /* TWD */
@@ -306,10 +341,11 @@ void __init at91_add_device_i2c(void)
         at91_set_A_periph(AT91_PIN_PA8, 0);             /* TWCK */
         at91_set_multi_drive(AT91_PIN_PA8, 1);
 
+        i2c_register_board_info(0, devices, nr_devices);
         platform_device_register(&at91sam9261_twi_device);
 }
 #else
-void __init at91_add_device_i2c(void) {}
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices) {}
 #endif
 
 
diff --git a/arch/arm/mach-at91/at91sam9263_devices.c b/arch/arm/mach-at91/at91sam9263_devices.c
index f924bd5017de..ac329a98e959 100644
--- a/arch/arm/mach-at91/at91sam9263_devices.c
+++ b/arch/arm/mach-at91/at91sam9263_devices.c
@@ -13,7 +13,9 @@
 #include <asm/mach/map.h>
 
 #include <linux/platform_device.h>
+#include <linux/i2c-gpio.h>
 
+#include <linux/fb.h>
 #include <video/atmel_lcdc.h>
 
 #include <asm/arch/board.h>
@@ -421,7 +423,40 @@ void __init at91_add_device_nand(struct at91_nand_data *data) {}
  *  TWI (i2c)
  * -------------------------------------------------------------------- */
 
-#if defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
+/*
+ * Prefer the GPIO code since the TWI controller isn't robust
+ * (gets overruns and underruns under load) and can only issue
+ * repeated STARTs in one scenario (the driver doesn't yet handle them).
+ */
+#if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
+
+static struct i2c_gpio_platform_data pdata = {
+        .sda_pin                = AT91_PIN_PB4,
+        .sda_is_open_drain      = 1,
+        .scl_pin                = AT91_PIN_PB5,
+        .scl_is_open_drain      = 1,
+        .udelay                 = 2,            /* ~100 kHz */
+};
+
+static struct platform_device at91sam9263_twi_device = {
+        .name                   = "i2c-gpio",
+        .id                     = -1,
+        .dev.platform_data      = &pdata,
+};
+
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
+{
+        at91_set_GPIO_periph(AT91_PIN_PB4, 1);          /* TWD (SDA) */
+        at91_set_multi_drive(AT91_PIN_PB4, 1);
+
+        at91_set_GPIO_periph(AT91_PIN_PB5, 1);          /* TWCK (SCL) */
+        at91_set_multi_drive(AT91_PIN_PB5, 1);
+
+        i2c_register_board_info(0, devices, nr_devices);
+        platform_device_register(&at91sam9263_twi_device);
+}
+
+#elif defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
 
 static struct resource twi_resources[] = {
         [0] = {
@@ -443,7 +478,7 @@ static struct platform_device at91sam9263_twi_device = {
         .num_resources  = ARRAY_SIZE(twi_resources),
 };
 
-void __init at91_add_device_i2c(void)
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
 {
         /* pins used for TWI interface */
         at91_set_A_periph(AT91_PIN_PB4, 0);             /* TWD */
@@ -452,10 +487,11 @@ void __init at91_add_device_i2c(void)
         at91_set_A_periph(AT91_PIN_PB5, 0);             /* TWCK */
         at91_set_multi_drive(AT91_PIN_PB5, 1);
 
+        i2c_register_board_info(0, devices, nr_devices);
         platform_device_register(&at91sam9263_twi_device);
 }
 #else
-void __init at91_add_device_i2c(void) {}
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices) {}
 #endif
 
 
diff --git a/arch/arm/mach-at91/at91sam9rl_devices.c b/arch/arm/mach-at91/at91sam9rl_devices.c
index cd7532bcd4e5..2bd60a3dc623 100644
--- a/arch/arm/mach-at91/at91sam9rl_devices.c
+++ b/arch/arm/mach-at91/at91sam9rl_devices.c
@@ -10,8 +10,9 @@
 #include <asm/mach/map.h>
 
 #include <linux/platform_device.h>
-#include <linux/fb.h>
+#include <linux/i2c-gpio.h>
 
+#include <linux/fb.h>
 #include <video/atmel_lcdc.h>
 
 #include <asm/arch/board.h>
@@ -169,7 +170,40 @@ void __init at91_add_device_nand(struct at91_nand_data *data) {}
  *  TWI (i2c)
  * -------------------------------------------------------------------- */
 
-#if defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
+/*
+ * Prefer the GPIO code since the TWI controller isn't robust
+ * (gets overruns and underruns under load) and can only issue
+ * repeated STARTs in one scenario (the driver doesn't yet handle them).
+ */
+#if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
+
+static struct i2c_gpio_platform_data pdata = {
+        .sda_pin                = AT91_PIN_PA23,
+        .sda_is_open_drain      = 1,
+        .scl_pin                = AT91_PIN_PA24,
+        .scl_is_open_drain      = 1,
+        .udelay                 = 2,            /* ~100 kHz */
+};
+
+static struct platform_device at91sam9rl_twi_device = {
+        .name                   = "i2c-gpio",
+        .id                     = -1,
+        .dev.platform_data      = &pdata,
+};
+
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
+{
+        at91_set_GPIO_periph(AT91_PIN_PA23, 1);         /* TWD (SDA) */
+        at91_set_multi_drive(AT91_PIN_PA23, 1);
+
+        at91_set_GPIO_periph(AT91_PIN_PA24, 1);         /* TWCK (SCL) */
+        at91_set_multi_drive(AT91_PIN_PA24, 1);
+
+        i2c_register_board_info(0, devices, nr_devices);
+        platform_device_register(&at91sam9rl_twi_device);
+}
+
+#elif defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)
 
 static struct resource twi_resources[] = {
         [0] = {
@@ -191,7 +225,7 @@ static struct platform_device at91sam9rl_twi_device = {
         .num_resources  = ARRAY_SIZE(twi_resources),
 };
 
-void __init at91_add_device_i2c(void)
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
 {
         /* pins used for TWI interface */
         at91_set_A_periph(AT91_PIN_PA23, 0);            /* TWD */
@@ -200,10 +234,11 @@ void __init at91_add_device_i2c(void)
         at91_set_A_periph(AT91_PIN_PA24, 0);            /* TWCK */
         at91_set_multi_drive(AT91_PIN_PA24, 1);
 
+        i2c_register_board_info(0, devices, nr_devices);
         platform_device_register(&at91sam9rl_twi_device);
 }
 #else
-void __init at91_add_device_i2c(void) {}
+void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices) {}
 #endif
 
 
diff --git a/arch/arm/mach-at91/board-carmeva.c b/arch/arm/mach-at91/board-carmeva.c
index 76ec856cd4f9..0f0878294a67 100644
--- a/arch/arm/mach-at91/board-carmeva.c
+++ b/arch/arm/mach-at91/board-carmeva.c
@@ -128,7 +128,7 @@ static void __init carmeva_board_init(void)
         /* USB Device */
         at91_add_device_udc(&carmeva_udc_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* SPI */
         at91_add_device_spi(carmeva_spi_devices, ARRAY_SIZE(carmeva_spi_devices));
         /* Compact Flash */
diff --git a/arch/arm/mach-at91/board-csb337.c b/arch/arm/mach-at91/board-csb337.c
index dde089922e3b..d0aa20c9383e 100644
--- a/arch/arm/mach-at91/board-csb337.c
+++ b/arch/arm/mach-at91/board-csb337.c
@@ -23,7 +23,6 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
-#include <linux/i2c.h>
 #include <linux/spi/spi.h>
 #include <linux/mtd/physmap.h>
 
@@ -85,12 +84,12 @@ static struct at91_udc_data __initdata csb337_udc_data = {
 };
 
 static struct i2c_board_info __initdata csb337_i2c_devices[] = {
-        { I2C_BOARD_INFO("rtc-ds1307", 0x68),
-          .type = "ds1307",
+        {
+                I2C_BOARD_INFO("rtc-ds1307", 0x68),
+                .type   = "ds1307",
         },
 };
 
-
 static struct at91_cf_data __initdata csb337_cf_data = {
         /*
          * connector P4 on the CSB 337 mates to
@@ -168,9 +167,7 @@ static void __init csb337_board_init(void)
         /* USB Device */
         at91_add_device_udc(&csb337_udc_data);
         /* I2C */
-        at91_add_device_i2c();
-        i2c_register_board_info(0, csb337_i2c_devices,
-                        ARRAY_SIZE(csb337_i2c_devices));
+        at91_add_device_i2c(csb337_i2c_devices, ARRAY_SIZE(csb337_i2c_devices));
         /* Compact Flash */
         at91_set_gpio_input(AT91_PIN_PB22, 1);          /* IOIS16 */
         at91_add_device_cf(&csb337_cf_data);
diff --git a/arch/arm/mach-at91/board-csb637.c b/arch/arm/mach-at91/board-csb637.c
index 77f04b935b3a..c5c721d27f42 100644
--- a/arch/arm/mach-at91/board-csb637.c
+++ b/arch/arm/mach-at91/board-csb637.c
@@ -129,7 +129,7 @@ static void __init csb637_board_init(void)
         /* USB Device */
         at91_add_device_udc(&csb637_udc_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* SPI */
         at91_add_device_spi(NULL, 0);
         /* NOR flash */
diff --git a/arch/arm/mach-at91/board-dk.c b/arch/arm/mach-at91/board-dk.c
index af497896a96c..40c9e4331706 100644
--- a/arch/arm/mach-at91/board-dk.c
+++ b/arch/arm/mach-at91/board-dk.c
@@ -124,6 +124,19 @@ static struct spi_board_info dk_spi_devices[] = {
 #endif
 };
 
+static struct i2c_board_info __initdata dk_i2c_devices[] = {
+        {
+                I2C_BOARD_INFO("ics1523", 0x26),
+        },
+        {
+                I2C_BOARD_INFO("x9429", 0x28),
+        },
+        {
+                I2C_BOARD_INFO("at24c", 0x50),
+                .type   = "24c1024",
+        }
+};
+
 static struct mtd_partition __initdata dk_nand_partition[] = {
         {
                 .name   = "NAND Partition 1",
@@ -185,7 +198,7 @@ static void __init dk_board_init(void)
         /* Compact Flash */
         at91_add_device_cf(&dk_cf_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(dk_i2c_devices, ARRAY_SIZE(dk_i2c_devices));
         /* SPI */
         at91_add_device_spi(dk_spi_devices, ARRAY_SIZE(dk_spi_devices));
 #ifdef CONFIG_MTD_AT91_DATAFLASH_CARD
diff --git a/arch/arm/mach-at91/board-eb9200.c b/arch/arm/mach-at91/board-eb9200.c
index 20458b5548f0..b7b79bb9d6c4 100644
--- a/arch/arm/mach-at91/board-eb9200.c
+++ b/arch/arm/mach-at91/board-eb9200.c
@@ -91,6 +91,14 @@ static struct at91_mmc_data __initdata eb9200_mmc_data = {
         .wire4          = 1,
 };
 
+static struct i2c_board_info __initdata eb9200_i2c_devices[] = {
+        {
+                I2C_BOARD_INFO("at24c", 0x50),
+                .type   = "24c512",
+        },
+};
+
+
 static void __init eb9200_board_init(void)
 {
         /* Serial */
@@ -102,7 +110,7 @@ static void __init eb9200_board_init(void)
         /* USB Device */
         at91_add_device_udc(&eb9200_udc_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(eb9200_i2c_devices, ARRAY_SIZE(eb9200_i2c_devices));
         /* Compact Flash */
         at91_add_device_cf(&eb9200_cf_data);
         /* SPI */
diff --git a/arch/arm/mach-at91/board-ek.c b/arch/arm/mach-at91/board-ek.c
index 322fdd75a1e4..d05b1b2be9fb 100644
--- a/arch/arm/mach-at91/board-ek.c
+++ b/arch/arm/mach-at91/board-ek.c
@@ -145,7 +145,7 @@ static void __init ek_board_init(void)
         at91_add_device_udc(&ek_udc_data);
         at91_set_multi_drive(ek_udc_data.pullup_pin, 1);        /* pullup_pin is connected to reset */
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(ek_i2c_devices, ARRAY_SIZE(ek_i2c_devices));
         /* SPI */
         at91_add_device_spi(ek_spi_devices, ARRAY_SIZE(ek_spi_devices));
 #ifdef CONFIG_MTD_AT91_DATAFLASH_CARD
diff --git a/arch/arm/mach-at91/board-kafa.c b/arch/arm/mach-at91/board-kafa.c
index c77d84ce9cae..cf1b7b2f76fb 100644
--- a/arch/arm/mach-at91/board-kafa.c
+++ b/arch/arm/mach-at91/board-kafa.c
@@ -92,7 +92,7 @@ static void __init kafa_board_init(void)
         /* USB Device */
         at91_add_device_udc(&kafa_udc_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* SPI */
         at91_add_device_spi(NULL, 0);
 }
diff --git a/arch/arm/mach-at91/board-kb9202.c b/arch/arm/mach-at91/board-kb9202.c
index 7d9b1a278fd6..4b39b9cda75b 100644
--- a/arch/arm/mach-at91/board-kb9202.c
+++ b/arch/arm/mach-at91/board-kb9202.c
@@ -124,7 +124,7 @@ static void __init kb9202_board_init(void)
         /* MMC */
         at91_add_device_mmc(0, &kb9202_mmc_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* SPI */
         at91_add_device_spi(NULL, 0);
         /* NAND */
diff --git a/arch/arm/mach-at91/board-picotux200.c b/arch/arm/mach-at91/board-picotux200.c
index 49cfe7ab4a85..6acb55c09ae5 100644
--- a/arch/arm/mach-at91/board-picotux200.c
+++ b/arch/arm/mach-at91/board-picotux200.c
@@ -139,7 +139,7 @@ static void __init picotux200_board_init(void)
         // at91_add_device_udc(&picotux200_udc_data);
         // at91_set_multi_drive(picotux200_udc_data.pullup_pin, 1);     /* pullup_pin is connected to reset */
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* SPI */
         // at91_add_device_spi(picotux200_spi_devices, ARRAY_SIZE(picotux200_spi_devices));
 #ifdef CONFIG_MTD_AT91_DATAFLASH_CARD
diff --git a/arch/arm/mach-at91/board-sam9260ek.c b/arch/arm/mach-at91/board-sam9260ek.c
index 65fa532bb4ac..b343a6c28120 100644
--- a/arch/arm/mach-at91/board-sam9260ek.c
+++ b/arch/arm/mach-at91/board-sam9260ek.c
@@ -189,7 +189,7 @@ static void __init ek_board_init(void)
         /* MMC */
         at91_add_device_mmc(0, &ek_mmc_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
 }
 
 MACHINE_START(AT91SAM9260EK, "Atmel AT91SAM9260-EK")
diff --git a/arch/arm/mach-at91/board-sam9261ek.c b/arch/arm/mach-at91/board-sam9261ek.c
index 42e172cb0f49..550ae59a3aca 100644
--- a/arch/arm/mach-at91/board-sam9261ek.c
+++ b/arch/arm/mach-at91/board-sam9261ek.c
@@ -382,14 +382,14 @@ static struct platform_device ek_button_device = {
 
 static void __init ek_add_device_buttons(void)
 {
-        at91_set_gpio_input(AT91_PIN_PB27, 0);  /* btn0 */
-        at91_set_deglitch(AT91_PIN_PB27, 1);
-        at91_set_gpio_input(AT91_PIN_PB26, 0);  /* btn1 */
-        at91_set_deglitch(AT91_PIN_PB26, 1);
-        at91_set_gpio_input(AT91_PIN_PB25, 0);  /* btn2 */
-        at91_set_deglitch(AT91_PIN_PB25, 1);
-        at91_set_gpio_input(AT91_PIN_PB24, 0);  /* btn3 */
-        at91_set_deglitch(AT91_PIN_PB24, 1);
+        at91_set_gpio_input(AT91_PIN_PA27, 0);  /* btn0 */
+        at91_set_deglitch(AT91_PIN_PA27, 1);
+        at91_set_gpio_input(AT91_PIN_PA26, 0);  /* btn1 */
+        at91_set_deglitch(AT91_PIN_PA26, 1);
+        at91_set_gpio_input(AT91_PIN_PA25, 0);  /* btn2 */
+        at91_set_deglitch(AT91_PIN_PA25, 1);
+        at91_set_gpio_input(AT91_PIN_PA24, 0);  /* btn3 */
+        at91_set_deglitch(AT91_PIN_PA24, 1);
 
         platform_device_register(&ek_button_device);
 }
@@ -406,7 +406,7 @@ static void __init ek_board_init(void)
         /* USB Device */
         at91_add_device_udc(&ek_udc_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* NAND */
         at91_add_device_nand(&ek_nand_data);
         /* DM9000 ethernet */
diff --git a/arch/arm/mach-at91/board-sam9263ek.c b/arch/arm/mach-at91/board-sam9263ek.c
index 2a1cc73390b7..ab9dcc075454 100644
--- a/arch/arm/mach-at91/board-sam9263ek.c
+++ b/arch/arm/mach-at91/board-sam9263ek.c
@@ -291,7 +291,7 @@ static void __init ek_board_init(void)
         /* NAND */
         at91_add_device_nand(&ek_nand_data);
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* LCD Controller */
         at91_add_device_lcdc(&ek_lcdc_data);
         /* AC97 */
diff --git a/arch/arm/mach-at91/board-sam9rlek.c b/arch/arm/mach-at91/board-sam9rlek.c
index 9b61320f295a..bc0546d7245f 100644
--- a/arch/arm/mach-at91/board-sam9rlek.c
+++ b/arch/arm/mach-at91/board-sam9rlek.c
@@ -181,7 +181,7 @@ static void __init ek_board_init(void)
         /* Serial */
         at91_add_device_serial();
         /* I2C */
-        at91_add_device_i2c();
+        at91_add_device_i2c(NULL, 0);
         /* NAND */
         at91_add_device_nand(&ek_nand_data);
         /* SPI */
diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c
index 848efb2a4ebf..57c3b647ce83 100644
--- a/arch/arm/mach-at91/clock.c
+++ b/arch/arm/mach-at91/clock.c
@@ -351,7 +351,7 @@ static void init_programmable_clock(struct clk *clk)
         pckr = at91_sys_read(AT91_PMC_PCKR(clk->id));
         parent = at91_css_to_clk(pckr & AT91_PMC_CSS);
         clk->parent = parent;
-        clk->rate_hz = parent->rate_hz / (1 << ((pckr >> 2) & 3));
+        clk->rate_hz = parent->rate_hz / (1 << ((pckr & AT91_PMC_PRES) >> 2));
 }
 
 #endif  /* CONFIG_AT91_PROGRAMMABLE_CLOCKS */
@@ -587,8 +587,11 @@ int __init at91_clock_init(unsigned long main_clock)
         mckr = at91_sys_read(AT91_PMC_MCKR);
         mck.parent = at91_css_to_clk(mckr & AT91_PMC_CSS);
         freq = mck.parent->rate_hz;
-        freq /= (1 << ((mckr >> 2) & 3));               /* prescale */
-        mck.rate_hz = freq / (1 + ((mckr >> 8) & 3));   /* mdiv */
+        freq /= (1 << ((mckr & AT91_PMC_PRES) >> 2));                           /* prescale */
+        if (cpu_is_at91rm9200())
+                mck.rate_hz = freq / (1 + ((mckr & AT91_PMC_MDIV) >> 8));       /* mdiv */
+        else
+                mck.rate_hz = freq / (1 << ((mckr & AT91_PMC_MDIV) >> 8));      /* mdiv */
 
         /* Register the PMC's standard clocks */
         for (i = 0; i < ARRAY_SIZE(standard_pmc_clocks); i++)
diff --git a/arch/arm/mach-imx/irq.c b/arch/arm/mach-imx/irq.c
index 0791b56caecc..a7465db84893 100644
--- a/arch/arm/mach-imx/irq.c
+++ b/arch/arm/mach-imx/irq.c
@@ -43,12 +43,46 @@
  *
  */
 
-#define INTENNUM_OFF              0x8
-#define INTDISNUM_OFF             0xC
+#define INTCNTL_OFF               0x00
+#define NIMASK_OFF                0x04
+#define INTENNUM_OFF              0x08
+#define INTDISNUM_OFF             0x0C
+#define INTENABLEH_OFF            0x10
+#define INTENABLEL_OFF            0x14
+#define INTTYPEH_OFF              0x18
+#define INTTYPEL_OFF              0x1C
+#define NIPRIORITY_OFF(x)         (0x20+4*(7-(x)))
+#define NIVECSR_OFF               0x40
+#define FIVECSR_OFF               0x44
+#define INTSRCH_OFF               0x48
+#define INTSRCL_OFF               0x4C
+#define INTFRCH_OFF               0x50
+#define INTFRCL_OFF               0x54
+#define NIPNDH_OFF                0x58
+#define NIPNDL_OFF                0x5C
+#define FIPNDH_OFF                0x60
+#define FIPNDL_OFF                0x64
 
 #define VA_AITC_BASE              IO_ADDRESS(IMX_AITC_BASE)
-#define IMX_AITC_INTDISNUM       (VA_AITC_BASE + INTDISNUM_OFF)
+#define IMX_AITC_INTCNTL         (VA_AITC_BASE + INTCNTL_OFF)
+#define IMX_AITC_NIMASK          (VA_AITC_BASE + NIMASK_OFF)
 #define IMX_AITC_INTENNUM        (VA_AITC_BASE + INTENNUM_OFF)
+#define IMX_AITC_INTDISNUM       (VA_AITC_BASE + INTDISNUM_OFF)
+#define IMX_AITC_INTENABLEH      (VA_AITC_BASE + INTENABLEH_OFF)
+#define IMX_AITC_INTENABLEL      (VA_AITC_BASE + INTENABLEL_OFF)
+#define IMX_AITC_INTTYPEH        (VA_AITC_BASE + INTTYPEH_OFF)
+#define IMX_AITC_INTTYPEL        (VA_AITC_BASE + INTTYPEL_OFF)
+#define IMX_AITC_NIPRIORITY(x)   (VA_AITC_BASE + NIPRIORITY_OFF(x))
+#define IMX_AITC_NIVECSR         (VA_AITC_BASE + NIVECSR_OFF)
+#define IMX_AITC_FIVECSR         (VA_AITC_BASE + FIVECSR_OFF)
+#define IMX_AITC_INTSRCH         (VA_AITC_BASE + INTSRCH_OFF)
+#define IMX_AITC_INTSRCL         (VA_AITC_BASE + INTSRCL_OFF)
+#define IMX_AITC_INTFRCH         (VA_AITC_BASE + INTFRCH_OFF)
+#define IMX_AITC_INTFRCL         (VA_AITC_BASE + INTFRCL_OFF)
+#define IMX_AITC_NIPNDH          (VA_AITC_BASE + NIPNDH_OFF)
+#define IMX_AITC_NIPNDL          (VA_AITC_BASE + NIPNDL_OFF)
+#define IMX_AITC_FIPNDH          (VA_AITC_BASE + FIPNDH_OFF)
+#define IMX_AITC_FIPNDL          (VA_AITC_BASE + FIPNDL_OFF)
 
 #if 0
 #define DEBUG_IRQ(fmt...)       printk(fmt)
@@ -222,7 +256,12 @@ imx_init_irq(void)
 
         DEBUG_IRQ("Initializing imx interrupts\n");
 
-        /* Mask all interrupts initially */
+        /* Disable all interrupts initially. */
+        /* Do not rely on the bootloader. */
+        __raw_writel(0, IMX_AITC_INTENABLEH);
+        __raw_writel(0, IMX_AITC_INTENABLEL);
+
+        /* Mask all GPIO interrupts as well */
         IMR(0) = 0;
         IMR(1) = 0;
         IMR(2) = 0;
@@ -245,6 +284,6 @@ imx_init_irq(void)
         set_irq_chained_handler(GPIO_INT_PORTC, imx_gpioc_demux_handler);
         set_irq_chained_handler(GPIO_INT_PORTD, imx_gpiod_demux_handler);
 
-        /* Disable all interrupts initially. */
-        /* In IMX this is done in the bootloader. */
+        /* Release masking of interrupts according to priority */
+        __raw_writel(-1, IMX_AITC_NIMASK);
 }
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index d0f2b597db12..8e126e6b74c3 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -146,7 +146,7 @@ static struct clk pxa27x_clks[] = {
         INIT_CKEN("MMCCLK",  MMC,  19500000, 0, &pxa_device_mci.dev),
         INIT_CKEN("FICPCLK", FICP, 48000000, 0, &pxa_device_ficp.dev),
 
-        INIT_CKEN("USBCLK", USB,    48000000, 0, &pxa27x_device_ohci.dev),
+        INIT_CKEN("USBCLK", USBHOST, 48000000, 0, &pxa27x_device_ohci.dev),
         INIT_CKEN("I2CCLK", PWRI2C, 13000000, 0, &pxa27x_device_i2c_power.dev),
         INIT_CKEN("KBDCLK", KEYPAD, 32768, 0, NULL),
 
diff --git a/arch/arm/mach-pxa/pxa320.c b/arch/arm/mach-pxa/pxa320.c
index 1010f77d977a..74128eb8f8d0 100644
--- a/arch/arm/mach-pxa/pxa320.c
+++ b/arch/arm/mach-pxa/pxa320.c
@@ -23,8 +23,11 @@
 static struct pxa3xx_mfp_addr_map pxa320_mfp_addr_map[] __initdata = {
 
         MFP_ADDR_X(GPIO0,  GPIO4,   0x0124),
-        MFP_ADDR_X(GPIO5,  GPIO26,  0x028C),
-        MFP_ADDR_X(GPIO27, GPIO62,  0x0400),
+        MFP_ADDR_X(GPIO5,  GPIO9,   0x028C),
+        MFP_ADDR(GPIO10, 0x0458),
+        MFP_ADDR_X(GPIO11, GPIO26,  0x02A0),
+        MFP_ADDR_X(GPIO27, GPIO48,  0x0400),
+        MFP_ADDR_X(GPIO49, GPIO62,  0x045C),
         MFP_ADDR_X(GPIO63, GPIO73,  0x04B4),
         MFP_ADDR_X(GPIO74, GPIO98,  0x04F0),
         MFP_ADDR_X(GPIO99, GPIO127, 0x0600),
diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c
index 71766ac0328b..422afee88169 100644
--- a/arch/arm/mach-pxa/ssp.c
+++ b/arch/arm/mach-pxa/ssp.c
@@ -309,6 +309,7 @@ void ssp_exit(struct ssp_dev *dev)
 
         if (dev->port > PXA_SSP_PORTS || dev->port == 0) {
                 printk(KERN_WARNING "SSP: tried to close invalid port\n");
+                mutex_unlock(&mutex);
                 return;
         }