1 files changed, 79 insertions, 0 deletions

diff --git a/arch/arm/plat-spear/pl080.c b/arch/arm/plat-spear/pl080.c
new file mode 100644
index 000000000000..d53d75e1af5e
--- /dev/null
+++ b/arch/arm/plat-spear/pl080.c
@@ -0,0 +1,79 @@
+/*
+ * arch/arm/plat-spear/pl080.c
+ *
+ * DMAC pl080 definitions for SPEAr platform
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Viresh Kumar <viresh.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/amba/pl08x.h>
+#include <linux/amba/bus.h>
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/spinlock_types.h>
+#include <mach/misc_regs.h>
+
+static spinlock_t lock = __SPIN_LOCK_UNLOCKED(x);
+
+struct {
+        unsigned char busy;
+        unsigned char val;
+} signals[16] = {{0, 0}, };
+
+int pl080_get_signal(struct pl08x_dma_chan *ch)
+{
+        const struct pl08x_channel_data *cd = ch->cd;
+        unsigned int signal = cd->min_signal, val;
+        unsigned long flags;
+
+        spin_lock_irqsave(&lock, flags);
+
+        /* Return if signal is already acquired by somebody else */
+        if (signals[signal].busy &&
+                        (signals[signal].val != cd->muxval)) {
+                spin_unlock_irqrestore(&lock, flags);
+                return -EBUSY;
+        }
+
+        /* If acquiring for the first time, configure it */
+        if (!signals[signal].busy) {
+                val = readl(DMA_CHN_CFG);
+
+                /*
+                 * Each request line has two bits in DMA_CHN_CFG register. To
+                 * goto the bits of current request line, do left shift of
+                 * value by 2 * signal number.
+                 */
+                val &= ~(0x3 << (signal * 2));
+                val |= cd->muxval << (signal * 2);
+                writel(val, DMA_CHN_CFG);
+        }
+
+        signals[signal].busy++;
+        signals[signal].val = cd->muxval;
+        spin_unlock_irqrestore(&lock, flags);
+
+        return signal;
+}
+
+void pl080_put_signal(struct pl08x_dma_chan *ch)
+{
+        const struct pl08x_channel_data *cd = ch->cd;
+        unsigned long flags;
+
+        spin_lock_irqsave(&lock, flags);
+
+        /* if signal is not used */
+        if (!signals[cd->min_signal].busy)
+                BUG();
+
+        signals[cd->min_signal].busy--;
+
+        spin_unlock_irqrestore(&lock, flags);
+}