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-rw-r--r--drivers/sh/intc/access.c237
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,
+};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.