1 files changed, 133 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/snoop.c b/arch/arm/plat-mxc/snoop.c
new file mode 100644
index 000000000000..bc733033d872
--- /dev/null
+++ b/arch/arm/plat-mxc/snoop.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2005-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <mach/hardware.h>
+#include <linux/io.h>
+
+#ifdef M4IF_BASE_ADDR
+#define SNOOP_V2
+#define MAX_SNOOP	2
+#define g_snoop_base	(IO_ADDRESS(M4IF_BASE_ADDR) + 0x4C)
+#elif defined(M3IF_BASE_ADDR)
+#define MAX_SNOOP	1
+#define g_snoop_base	(IO_ADDRESS(M3IF_BASE_ADDR) + 0x28)
+#else
+#define MAX_SNOOP	0
+#define g_snoop_base	0
+#endif
+
+/* M3IF Snooping Configuration Register 0 (M3IFSCFG0) READ/WRITE*/
+#define SBAR(x)		(x * 0x14)
+/* M3IF Snooping Configuration Register 1 (M3IFSCFG1) READ/WRITE*/
+#define SERL(x)		((x * 0x14) + 0x4)
+/* M3IF Snooping Configuration Register 2 (M3IFSCFG2) READ/WRITE*/
+#define SERH(x)		((x * 0x14) + 0x8)
+/* M3IF Snooping Status Register 0 (M3IFSSR0) READ/WRITE */
+#define SSRL(x)		((x * 0x14) + 0xC)
+/* M3IF Snooping Status Register 1 (M3IFSSR1) */
+#define SSRH(x)		((x * 0x14) + 0x10)
+
+#if MAX_SNOOP
+
+int mxc_snoop_set_config(u32 num, unsigned long base, int size)
+{
+	u32 reg;
+	uint32_t msb;
+	uint32_t seg_size;
+	uint32_t window_size = 0;
+	int i;
+
+	if (num >= MAX_SNOOP) {
+		return -EINVAL;
+	}
+
+	/* Setup M3IF for snooping */
+	if (size) {
+
+		if (base == 0) {
+			return -EINVAL;
+		}
+
+		msb = fls(size);
+		if (!(size & ((1UL << msb) - 1)))
+			msb--;	/* Already aligned to power 2 */
+		if (msb < 11)
+			msb = 11;
+
+		window_size = (1UL << msb);
+		seg_size = window_size / 64;
+
+		msb -= 11;
+
+		reg = base & ~((1UL << msb) - 1);
+		reg |= msb << 1;
+		reg |= 1;	/* enable snooping */
+		reg |= 0x80;	/* Set pulse width to default (M4IF only) */
+		__raw_writel(reg, g_snoop_base + SBAR(num));
+
+		reg = 0;
+		for (i = 0; i < 32; i++) {
+			if (i * seg_size >= size)
+				break;
+			reg |= 1UL << i;
+		}
+		__raw_writel(reg, g_snoop_base + SERL(num));
+
+		reg = 0;
+		for (i = 32; i < 64; i++) {
+			if (i * seg_size >= size)
+				break;
+			reg |= 1UL << (i - 32);
+		}
+		__raw_writel(reg, g_snoop_base + SERH(num));
+
+		pr_debug
+		    ("Snooping unit # %d enabled: window size = 0x%X, M3IFSCFG0=0x%08X, M3IFSCFG1=0x%08X, M3IFSCFG2=0x%08X\n",
+		     num, window_size, __raw_readl(g_snoop_base + SBAR(num)),
+		     __raw_readl(g_snoop_base + SERL(num)),
+		     __raw_readl(g_snoop_base + SERH(num)));
+	} else {
+		__raw_writel(0, g_snoop_base + SBAR(num));
+	}
+
+	return window_size;
+}
+
+EXPORT_SYMBOL(mxc_snoop_set_config);
+
+int mxc_snoop_get_status(u32 num, u32 *statl, u32 *stath)
+{
+	if (num >= MAX_SNOOP) {
+		return -EINVAL;
+	}
+
+	*statl = __raw_readl(g_snoop_base + SSRL(num));
+	*stath = __raw_readl(g_snoop_base + SSRH(num));
+	/* DPRINTK("status = 0x%08X%08X\n", stat[1], stat[0]); */
+
+#ifdef SNOOP_V2
+	__raw_writel(*statl, g_snoop_base + SSRL(num));
+	__raw_writel(*stath, g_snoop_base + SSRH(num));
+#else
+	__raw_writel(0x0, g_snoop_base + SSRL(num));
+	__raw_writel(0x0, g_snoop_base + SSRH(num));
+#endif
+	return 0;
+}
+
+EXPORT_SYMBOL(mxc_snoop_get_status);
+
+#endif				/* MAX_SNOOP */