sh: intc: Split up the INTC code.

This splits up the sh intc core in to something more vaguely resembling
a subsystem. Most of the functionality was alread fairly well
compartmentalized, and there were only a handful of interdependencies
that needed to be resolved in the process.

This also serves as future-proofing for the genirq and sparseirq rework,
which will make some of the split out functionality wholly generic,
allowing things to be killed off in place with minimal migration pain.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 237 insertions, 0 deletions

diff --git a/drivers/sh/intc/access.c b/drivers/sh/intc/access.c
new file mode 100644
index 000000000000..f892ae1d212a
--- /dev/null
+++ b/drivers/sh/intc/access.c
@@ -0,0 +1,237 @@
+/*
+ * Common INTC2 register accessors
+ *
+ * Copyright (C) 2007, 2008 Magnus Damm
+ * Copyright (C) 2009, 2010 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/io.h>
+#include "internals.h"
+
+unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address)
+{
+	struct intc_window *window;
+	int k;
+
+	/* scan through physical windows and convert address */
+	for (k = 0; k < d->nr_windows; k++) {
+		window = d->window + k;
+
+		if (address < window->phys)
+			continue;
+
+		if (address >= (window->phys + window->size))
+			continue;
+
+		address -= window->phys;
+		address += (unsigned long)window->virt;
+
+		return address;
+	}
+
+	/* no windows defined, register must be 1:1 mapped virt:phys */
+	return address;
+}
+
+unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address)
+{
+	unsigned int k;
+
+	address = intc_phys_to_virt(d, address);
+
+	for (k = 0; k < d->nr_reg; k++) {
+		if (d->reg[k] == address)
+			return k;
+	}
+
+	BUG();
+	return 0;
+}
+
+unsigned int intc_set_field_from_handle(unsigned int value,
+					unsigned int field_value,
+					unsigned int handle)
+{
+	unsigned int width = _INTC_WIDTH(handle);
+	unsigned int shift = _INTC_SHIFT(handle);
+
+	value &= ~(((1 << width) - 1) << shift);
+	value |= field_value << shift;
+	return value;
+}
+
+unsigned long intc_get_field_from_handle(unsigned int value, unsigned int handle)
+{
+	unsigned int width = _INTC_WIDTH(handle);
+	unsigned int shift = _INTC_SHIFT(handle);
+	unsigned int mask = ((1 << width) - 1) << shift;
+
+	return (value & mask) >> shift;
+}
+
+static unsigned long test_8(unsigned long addr, unsigned long h,
+			    unsigned long ignore)
+{
+	return intc_get_field_from_handle(__raw_readb(addr), h);
+}
+
+static unsigned long test_16(unsigned long addr, unsigned long h,
+			     unsigned long ignore)
+{
+	return intc_get_field_from_handle(__raw_readw(addr), h);
+}
+
+static unsigned long test_32(unsigned long addr, unsigned long h,
+			     unsigned long ignore)
+{
+	return intc_get_field_from_handle(__raw_readl(addr), h);
+}
+
+static unsigned long write_8(unsigned long addr, unsigned long h,
+			     unsigned long data)
+{
+	__raw_writeb(intc_set_field_from_handle(0, data, h), addr);
+	(void)__raw_readb(addr);	/* Defeat write posting */
+	return 0;
+}
+
+static unsigned long write_16(unsigned long addr, unsigned long h,
+			      unsigned long data)
+{
+	__raw_writew(intc_set_field_from_handle(0, data, h), addr);
+	(void)__raw_readw(addr);	/* Defeat write posting */
+	return 0;
+}
+
+static unsigned long write_32(unsigned long addr, unsigned long h,
+			      unsigned long data)
+{
+	__raw_writel(intc_set_field_from_handle(0, data, h), addr);
+	(void)__raw_readl(addr);	/* Defeat write posting */
+	return 0;
+}
+
+static unsigned long modify_8(unsigned long addr, unsigned long h,
+			      unsigned long data)
+{
+	unsigned long flags;
+	unsigned int value;
+	local_irq_save(flags);
+	value = intc_set_field_from_handle(__raw_readb(addr), data, h);
+	__raw_writeb(value, addr);
+	(void)__raw_readb(addr);	/* Defeat write posting */
+	local_irq_restore(flags);
+	return 0;
+}
+
+static unsigned long modify_16(unsigned long addr, unsigned long h,
+			       unsigned long data)
+{
+	unsigned long flags;
+	unsigned int value;
+	local_irq_save(flags);
+	value = intc_set_field_from_handle(__raw_readw(addr), data, h);
+	__raw_writew(value, addr);
+	(void)__raw_readw(addr);	/* Defeat write posting */
+	local_irq_restore(flags);
+	return 0;
+}
+
+static unsigned long modify_32(unsigned long addr, unsigned long h,
+			       unsigned long data)
+{
+	unsigned long flags;
+	unsigned int value;
+	local_irq_save(flags);
+	value = intc_set_field_from_handle(__raw_readl(addr), data, h);
+	__raw_writel(value, addr);
+	(void)__raw_readl(addr);	/* Defeat write posting */
+	local_irq_restore(flags);
+	return 0;
+}
+
+static unsigned long intc_mode_field(unsigned long addr,
+				     unsigned long handle,
+				     unsigned long (*fn)(unsigned long,
+						unsigned long,
+						unsigned long),
+				     unsigned int irq)
+{
+	return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1));
+}
+
+static unsigned long intc_mode_zero(unsigned long addr,
+				    unsigned long handle,
+				    unsigned long (*fn)(unsigned long,
+					       unsigned long,
+					       unsigned long),
+				    unsigned int irq)
+{
+	return fn(addr, handle, 0);
+}
+
+static unsigned long intc_mode_prio(unsigned long addr,
+				    unsigned long handle,
+				    unsigned long (*fn)(unsigned long,
+					       unsigned long,
+					       unsigned long),
+				    unsigned int irq)
+{
+	return fn(addr, handle, intc_get_prio_level(irq));
+}
+
+unsigned long (*intc_reg_fns[])(unsigned long addr,
+				unsigned long h,
+				unsigned long data) = {
+	[REG_FN_TEST_BASE + 0] = test_8,
+	[REG_FN_TEST_BASE + 1] = test_16,
+	[REG_FN_TEST_BASE + 3] = test_32,
+	[REG_FN_WRITE_BASE + 0] = write_8,
+	[REG_FN_WRITE_BASE + 1] = write_16,
+	[REG_FN_WRITE_BASE + 3] = write_32,
+	[REG_FN_MODIFY_BASE + 0] = modify_8,
+	[REG_FN_MODIFY_BASE + 1] = modify_16,
+	[REG_FN_MODIFY_BASE + 3] = modify_32,
+};
+
+unsigned long (*intc_enable_fns[])(unsigned long addr,
+				   unsigned long handle,
+				   unsigned long (*fn)(unsigned long,
+					    unsigned long,
+					    unsigned long),
+				   unsigned int irq) = {
+	[MODE_ENABLE_REG] = intc_mode_field,
+	[MODE_MASK_REG] = intc_mode_zero,
+	[MODE_DUAL_REG] = intc_mode_field,
+	[MODE_PRIO_REG] = intc_mode_prio,
+	[MODE_PCLR_REG] = intc_mode_prio,
+};
+
+unsigned long (*intc_disable_fns[])(unsigned long addr,
+				    unsigned long handle,
+				    unsigned long (*fn)(unsigned long,
+					     unsigned long,
+					     unsigned long),
+				    unsigned int irq) = {
+	[MODE_ENABLE_REG] = intc_mode_zero,
+	[MODE_MASK_REG] = intc_mode_field,
+	[MODE_DUAL_REG] = intc_mode_field,
+	[MODE_PRIO_REG] = intc_mode_zero,
+	[MODE_PCLR_REG] = intc_mode_field,
+};
+
+unsigned long (*intc_enable_noprio_fns[])(unsigned long addr,
+					  unsigned long handle,
+					  unsigned long (*fn)(unsigned long,
+						unsigned long,
+						unsigned long),
+					  unsigned int irq) = {
+	[MODE_ENABLE_REG] = intc_mode_field,
+	[MODE_MASK_REG] = intc_mode_zero,
+	[MODE_DUAL_REG] = intc_mode_field,
+	[MODE_PRIO_REG] = intc_mode_field,
+	[MODE_PCLR_REG] = intc_mode_field,
+};