6 files changed, 182 insertions, 50 deletions

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 5b7c26395b44..028bdc9228fb 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -179,17 +179,19 @@ alloc_safe_buffer(struct dmabounce_device_info *device_info, void *ptr,
 static inline struct safe_buffer *
 find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_addr)
 {
-        struct safe_buffer *b = NULL;
+        struct safe_buffer *b, *rb = NULL;
         unsigned long flags;
 
         read_lock_irqsave(&device_info->lock, flags);
 
         list_for_each_entry(b, &device_info->safe_buffers, node)
-                if (b->safe_dma_addr == safe_dma_addr)
+                if (b->safe_dma_addr == safe_dma_addr) {
+                        rb = b;
                         break;
+                }
 
         read_unlock_irqrestore(&device_info->lock, flags);
-        return b;
+        return rb;
 }
 
 static inline void
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 7ea5f01dfc7b..de4e33137901 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -634,6 +634,14 @@ ENTRY(__switch_to)
  * purpose.
  */
 
+        .macro  usr_ret, reg
+#ifdef CONFIG_ARM_THUMB
+        bx      \reg
+#else
+        mov     pc, \reg
+#endif
+        .endm
+
         .align  5
         .globl  __kuser_helper_start
 __kuser_helper_start:
@@ -675,7 +683,7 @@ __kuser_memory_barrier:				@ 0xffff0fa0
 #if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_SMP)
         mcr     p15, 0, r0, c7, c10, 5  @ dmb
 #endif
-        mov     pc, lr
+        usr_ret lr
 
         .align  5
 
@@ -778,7 +786,7 @@ __kuser_cmpxchg:				@ 0xffff0fc0
         mov     r0, #-1
         adds    r0, r0, #0
 #endif
-        mov     pc, lr
+        usr_ret lr
 
 #else
 
@@ -792,7 +800,7 @@ __kuser_cmpxchg:				@ 0xffff0fc0
 #ifdef CONFIG_SMP
         mcr     p15, 0, r0, c7, c10, 5  @ dmb
 #endif
-        mov     pc, lr
+        usr_ret lr
 
 #endif
 
@@ -834,16 +842,11 @@ __kuser_cmpxchg:				@ 0xffff0fc0
 __kuser_get_tls:                                @ 0xffff0fe0
 
 #if !defined(CONFIG_HAS_TLS_REG) && !defined(CONFIG_TLS_REG_EMUL)
-
         ldr     r0, [pc, #(16 - 8)]             @ TLS stored at 0xffff0ff0
-        mov     pc, lr
-
 #else
-
         mrc     p15, 0, r0, c13, c0, 3          @ read TLS register
-        mov     pc, lr
-
 #endif
+        usr_ret lr
 
         .rep    5
         .word   0                       @ pad up to __kuser_helper_version
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 4fe386eea4b4..5365d4e5949e 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -118,7 +118,7 @@ ENTRY(secondary_startup)
         sub     r4, r4, r5                      @ mmu has been enabled
         ldr     r4, [r7, r4]                    @ get secondary_data.pgdir
         adr     lr, __enable_mmu                @ return address
-        add     pc, r10, #12                    @ initialise processor
+        add     pc, r10, #PROCINFO_INITFUNC     @ initialise processor
                                                 @ (return control reg)
 
         /*
diff --git a/arch/arm/mach-s3c2410/Makefile b/arch/arm/mach-s3c2410/Makefile
index 0c7938645df6..273e05f2b8de 100644
--- a/arch/arm/mach-s3c2410/Makefile
+++ b/arch/arm/mach-s3c2410/Makefile
@@ -10,45 +10,47 @@ obj-m			:=
 obj-n                   :=
 obj-                    :=
 
+# DMA
+obj-$(CONFIG_S3C2410_DMA)       += dma.o
+
 # S3C2400 support files
-obj-$(CONFIG_CPU_S3C2400)  += s3c2400-gpio.o
+obj-$(CONFIG_CPU_S3C2400)       += s3c2400-gpio.o
 
 # S3C2410 support files
 
-obj-$(CONFIG_CPU_S3C2410)  += s3c2410.o
-obj-$(CONFIG_CPU_S3C2410)  += s3c2410-gpio.o
-obj-$(CONFIG_S3C2410_DMA)  += dma.o
+obj-$(CONFIG_CPU_S3C2410)       += s3c2410.o
+obj-$(CONFIG_CPU_S3C2410)       += s3c2410-gpio.o
 
 # Power Management support
 
-obj-$(CONFIG_PM)           += pm.o sleep.o
-obj-$(CONFIG_PM_SIMTEC)    += pm-simtec.o
+obj-$(CONFIG_PM)                += pm.o sleep.o
+obj-$(CONFIG_PM_SIMTEC)         += pm-simtec.o
 
 # S3C2412 support
-obj-$(CONFIG_CPU_S3C2412)  += s3c2412.o
-obj-$(CONFIG_CPU_S3C2412)  += s3c2412-clock.o
+obj-$(CONFIG_CPU_S3C2412)       += s3c2412.o
+obj-$(CONFIG_CPU_S3C2412)       += s3c2412-clock.o
 
 #
 # S3C244X support
 
-obj-$(CONFIG_CPU_S3C244X)  += s3c244x.o
-obj-$(CONFIG_CPU_S3C244X)  += s3c244x-irq.o
+obj-$(CONFIG_CPU_S3C244X)       += s3c244x.o
+obj-$(CONFIG_CPU_S3C244X)       += s3c244x-irq.o
 
 # Clock control
 
-obj-$(CONFIG_S3C2410_CLOCK) += s3c2410-clock.o
+obj-$(CONFIG_S3C2410_CLOCK)     += s3c2410-clock.o
 
 # S3C2440 support
 
-obj-$(CONFIG_CPU_S3C2440)  += s3c2440.o s3c2440-dsc.o
-obj-$(CONFIG_CPU_S3C2440)  += s3c2440-irq.o
-obj-$(CONFIG_CPU_S3C2440)  += s3c2440-clock.o
-obj-$(CONFIG_CPU_S3C2440)  += s3c2410-gpio.o
+obj-$(CONFIG_CPU_S3C2440)       += s3c2440.o s3c2440-dsc.o
+obj-$(CONFIG_CPU_S3C2440)       += s3c2440-irq.o
+obj-$(CONFIG_CPU_S3C2440)       += s3c2440-clock.o
+obj-$(CONFIG_CPU_S3C2440)       += s3c2410-gpio.o
 
 # S3C2442 support
 
-obj-$(CONFIG_CPU_S3C2442)  += s3c2442.o
-obj-$(CONFIG_CPU_S3C2442)  += s3c2442-clock.o
+obj-$(CONFIG_CPU_S3C2442)       += s3c2442.o
+obj-$(CONFIG_CPU_S3C2442)       += s3c2442-clock.o
 
 # bast extras
 
diff --git a/arch/arm/mach-s3c2410/dma.c b/arch/arm/mach-s3c2410/dma.c
index 094cc52745c5..25855452fe8c 100644
--- a/arch/arm/mach-s3c2410/dma.c
+++ b/arch/arm/mach-s3c2410/dma.c
@@ -112,7 +112,7 @@ dmadbg_capture(s3c2410_dma_chan_t *chan, struct s3c2410_dma_regstate *regs)
 }
 
 static void
-dmadbg_showregs(const char *fname, int line, s3c2410_dma_chan_t *chan,
+dmadbg_dumpregs(const char *fname, int line, s3c2410_dma_chan_t *chan,
                  struct s3c2410_dma_regstate *regs)
 {
         printk(KERN_DEBUG "dma%d: %s:%d: DCSRC=%08lx, DISRC=%08lx, DSTAT=%08lx DMT=%02lx, DCON=%08lx\n",
@@ -132,7 +132,16 @@ dmadbg_showchan(const char *fname, int line, s3c2410_dma_chan_t *chan)
                chan->number, fname, line, chan->load_state,
                chan->curr, chan->next, chan->end);
 
-        dmadbg_showregs(fname, line, chan, &state);
+        dmadbg_dumpregs(fname, line, chan, &state);
+}
+
+static void
+dmadbg_showregs(const char *fname, int line, s3c2410_dma_chan_t *chan)
+{
+        struct s3c2410_dma_regstate state;
+
+        dmadbg_capture(chan, &state);
+        dmadbg_dumpregs(fname, line, chan, &state);
 }
 
 #define dbg_showregs(chan) dmadbg_showregs(__FUNCTION__, __LINE__, (chan))
@@ -253,10 +262,14 @@ s3c2410_dma_loadbuffer(s3c2410_dma_chan_t *chan,
                          buf->next);
                 reload = (buf->next == NULL) ? S3C2410_DCON_NORELOAD : 0;
         } else {
-                pr_debug("load_state is %d => autoreload\n", chan->load_state);
+                //pr_debug("load_state is %d => autoreload\n", chan->load_state);
                 reload = S3C2410_DCON_AUTORELOAD;
         }
 
+        if ((buf->data & 0xf0000000) != 0x30000000) {
+                dmawarn("dmaload: buffer is %p\n", (void *)buf->data);
+        }
+
         writel(buf->data, chan->addr_reg);
 
         dma_wrreg(chan, S3C2410_DMA_DCON,
@@ -370,7 +383,7 @@ static int s3c2410_dma_start(s3c2410_dma_chan_t *chan)
         tmp |= S3C2410_DMASKTRIG_ON;
         dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
 
-        pr_debug("wrote %08lx to DMASKTRIG\n", tmp);
+        pr_debug("dma%d: %08lx to DMASKTRIG\n", chan->number, tmp);
 
 #if 0
         /* the dma buffer loads should take care of clearing the AUTO
@@ -384,7 +397,30 @@ static int s3c2410_dma_start(s3c2410_dma_chan_t *chan)
 
         dbg_showchan(chan);
 
+        /* if we've only loaded one buffer onto the channel, then chec
+         * to see if we have another, and if so, try and load it so when
+         * the first buffer is finished, the new one will be loaded onto
+         * the channel */
+
+        if (chan->next != NULL) {
+                if (chan->load_state == S3C2410_DMALOAD_1LOADED) {
+
+                        if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
+                                pr_debug("%s: buff not yet loaded, no more todo\n",
+                                         __FUNCTION__);
+                        } else {
+                                chan->load_state = S3C2410_DMALOAD_1RUNNING;
+                                s3c2410_dma_loadbuffer(chan, chan->next);
+                        }
+
+                } else if (chan->load_state == S3C2410_DMALOAD_1RUNNING) {
+                        s3c2410_dma_loadbuffer(chan, chan->next);
+                }
+        }
+
+
         local_irq_restore(flags);
+
         return 0;
 }
 
@@ -436,12 +472,11 @@ int s3c2410_dma_enqueue(unsigned int channel, void *id,
         buf = kmem_cache_alloc(dma_kmem, GFP_ATOMIC);
         if (buf == NULL) {
                 pr_debug("%s: out of memory (%ld alloc)\n",
-                         __FUNCTION__, sizeof(*buf));
+                         __FUNCTION__, (long)sizeof(*buf));
                 return -ENOMEM;
         }
 
-        pr_debug("%s: new buffer %p\n", __FUNCTION__, buf);
-
+        //pr_debug("%s: new buffer %p\n", __FUNCTION__, buf);
         //dbg_showchan(chan);
 
         buf->next  = NULL;
@@ -537,14 +572,20 @@ s3c2410_dma_lastxfer(s3c2410_dma_chan_t *chan)
         case S3C2410_DMALOAD_1LOADED:
                 if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
                                 /* flag error? */
-                        printk(KERN_ERR "dma%d: timeout waiting for load\n",
-                               chan->number);
+                        printk(KERN_ERR "dma%d: timeout waiting for load (%s)\n",
+                               chan->number, __FUNCTION__);
                         return;
                 }
                 break;
 
+        case S3C2410_DMALOAD_1LOADED_1RUNNING:
+                /* I belive in this case we do not have anything to do
+                 * until the next buffer comes along, and we turn off the
+                 * reload */
+                return;
+
         default:
-                pr_debug("dma%d: lastxfer: unhandled load_state %d with no next",
+                pr_debug("dma%d: lastxfer: unhandled load_state %d with no next\n",
                          chan->number, chan->load_state);
                 return;
 
@@ -629,7 +670,14 @@ s3c2410_dma_irq(int irq, void *devpw, struct pt_regs *regs)
         } else {
         }
 
-        if (chan->next != NULL) {
+        /* only reload if the channel is still running... our buffer done
+         * routine may have altered the state by requesting the dma channel
+         * to stop or shutdown... */
+
+        /* todo: check that when the channel is shut-down from inside this
+         * function, we cope with unsetting reload, etc */
+
+        if (chan->next != NULL && chan->state != S3C2410_DMA_IDLE) {
                 unsigned long flags;
 
                 switch (chan->load_state) {
@@ -644,8 +692,8 @@ s3c2410_dma_irq(int irq, void *devpw, struct pt_regs *regs)
                 case S3C2410_DMALOAD_1LOADED:
                         if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
                                 /* flag error? */
-                                printk(KERN_ERR "dma%d: timeout waiting for load\n",
-                                       chan->number);
+                                printk(KERN_ERR "dma%d: timeout waiting for load (%s)\n",
+                                       chan->number, __FUNCTION__);
                                 return IRQ_HANDLED;
                         }
 
@@ -678,8 +726,6 @@ s3c2410_dma_irq(int irq, void *devpw, struct pt_regs *regs)
         return IRQ_HANDLED;
 }
 
-
-
 /* s3c2410_request_dma
  *
  * get control of an dma channel
@@ -718,11 +764,17 @@ int s3c2410_dma_request(unsigned int channel, s3c2410_dma_client_t *client,
                 pr_debug("dma%d: %s : requesting irq %d\n",
                          channel, __FUNCTION__, chan->irq);
 
+                chan->irq_claimed = 1;
+                local_irq_restore(flags);
+
                 err = request_irq(chan->irq, s3c2410_dma_irq, IRQF_DISABLED,
                                   client->name, (void *)chan);
 
+                local_irq_save(flags);
+
                 if (err) {
                         chan->in_use = 0;
+                        chan->irq_claimed = 0;
                         local_irq_restore(flags);
 
                         printk(KERN_ERR "%s: cannot get IRQ %d for DMA %d\n",
@@ -730,7 +782,6 @@ int s3c2410_dma_request(unsigned int channel, s3c2410_dma_client_t *client,
                         return err;
                 }
 
-                chan->irq_claimed = 1;
                 chan->irq_enabled = 1;
         }
 
@@ -810,6 +861,7 @@ static int s3c2410_dma_dostop(s3c2410_dma_chan_t *chan)
 
         tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
         tmp |= S3C2410_DMASKTRIG_STOP;
+        //tmp &= ~S3C2410_DMASKTRIG_ON;
         dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
 
 #if 0
@@ -819,6 +871,7 @@ static int s3c2410_dma_dostop(s3c2410_dma_chan_t *chan)
         dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
 #endif
 
+        /* should stop do this, or should we wait for flush? */
         chan->state      = S3C2410_DMA_IDLE;
         chan->load_state = S3C2410_DMALOAD_NONE;
 
@@ -827,6 +880,22 @@ static int s3c2410_dma_dostop(s3c2410_dma_chan_t *chan)
         return 0;
 }
 
+void s3c2410_dma_waitforstop(s3c2410_dma_chan_t *chan)
+{
+        unsigned long tmp;
+        unsigned int timeout = 0x10000;
+
+        while (timeout-- > 0) {
+                tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
+
+                if (!(tmp & S3C2410_DMASKTRIG_ON))
+                        return;
+        }
+
+        pr_debug("dma%d: failed to stop?\n", chan->number);
+}
+
+
 /* s3c2410_dma_flush
  *
  * stop the channel, and remove all current and pending transfers
@@ -837,7 +906,9 @@ static int s3c2410_dma_flush(s3c2410_dma_chan_t *chan)
         s3c2410_dma_buf_t *buf, *next;
         unsigned long flags;
 
-        pr_debug("%s:\n", __FUNCTION__);
+        pr_debug("%s: chan %p (%d)\n", __FUNCTION__, chan, chan->number);
+
+        dbg_showchan(chan);
 
         local_irq_save(flags);
 
@@ -864,11 +935,64 @@ static int s3c2410_dma_flush(s3c2410_dma_chan_t *chan)
                 }
         }
 
+        dbg_showregs(chan);
+
+        s3c2410_dma_waitforstop(chan);
+
+#if 0
+        /* should also clear interrupts, according to WinCE BSP */
+        {
+                unsigned long tmp;
+
+                tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
+                tmp |= S3C2410_DCON_NORELOAD;
+                dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
+        }
+#endif
+
+        dbg_showregs(chan);
+
         local_irq_restore(flags);
 
         return 0;
 }
 
+int
+s3c2410_dma_started(s3c2410_dma_chan_t *chan)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+
+        dbg_showchan(chan);
+
+        /* if we've only loaded one buffer onto the channel, then chec
+         * to see if we have another, and if so, try and load it so when
+         * the first buffer is finished, the new one will be loaded onto
+         * the channel */
+
+        if (chan->next != NULL) {
+                if (chan->load_state == S3C2410_DMALOAD_1LOADED) {
+
+                        if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
+                                pr_debug("%s: buff not yet loaded, no more todo\n",
+                                         __FUNCTION__);
+                        } else {
+                                chan->load_state = S3C2410_DMALOAD_1RUNNING;
+                                s3c2410_dma_loadbuffer(chan, chan->next);
+                        }
+
+                } else if (chan->load_state == S3C2410_DMALOAD_1RUNNING) {
+                        s3c2410_dma_loadbuffer(chan, chan->next);
+                }
+        }
+
+
+        local_irq_restore(flags);
+
+        return 0;
+
+}
 
 int
 s3c2410_dma_ctrl(dmach_t channel, s3c2410_chan_op_t op)
@@ -885,14 +1009,15 @@ s3c2410_dma_ctrl(dmach_t channel, s3c2410_chan_op_t op)
                 return s3c2410_dma_dostop(chan);
 
         case S3C2410_DMAOP_PAUSE:
-                return -ENOENT;
-
         case S3C2410_DMAOP_RESUME:
                 return -ENOENT;
 
         case S3C2410_DMAOP_FLUSH:
                 return s3c2410_dma_flush(chan);
 
+        case S3C2410_DMAOP_STARTED:
+                return s3c2410_dma_started(chan);
+
         case S3C2410_DMAOP_TIMEOUT:
                 return 0;
 
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index c4e3f8c68479..f2bbef07b1e4 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -285,7 +285,7 @@ static struct flash_platform_data versatile_flash_data = {
 
 static struct resource versatile_flash_resource = {
         .start                  = VERSATILE_FLASH_BASE,
-        .end                    = VERSATILE_FLASH_BASE + VERSATILE_FLASH_SIZE,
+        .end                    = VERSATILE_FLASH_BASE + VERSATILE_FLASH_SIZE - 1,
         .flags                  = IORESOURCE_MEM,
 };