cregit-Linux how code gets into the kernel

Release 4.11 drivers/sh/intc/access.c

Directory: drivers/sh/intc
/*
 * 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; }

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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; }

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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; }

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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; }

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static unsigned long test_8(unsigned long addr, unsigned long h, unsigned long ignore) { void __iomem *ptr = (void __iomem *)addr; return intc_get_field_from_handle(__raw_readb(ptr), h); }

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static unsigned long test_16(unsigned long addr, unsigned long h, unsigned long ignore) { void __iomem *ptr = (void __iomem *)addr; return intc_get_field_from_handle(__raw_readw(ptr), h); }

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static unsigned long test_32(unsigned long addr, unsigned long h, unsigned long ignore) { void __iomem *ptr = (void __iomem *)addr; return intc_get_field_from_handle(__raw_readl(ptr), h); }

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static unsigned long write_8(unsigned long addr, unsigned long h, unsigned long data) { void __iomem *ptr = (void __iomem *)addr; __raw_writeb(intc_set_field_from_handle(0, data, h), ptr); (void)__raw_readb(ptr); /* Defeat write posting */ return 0; }

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static unsigned long write_16(unsigned long addr, unsigned long h, unsigned long data) { void __iomem *ptr = (void __iomem *)addr; __raw_writew(intc_set_field_from_handle(0, data, h), ptr); (void)__raw_readw(ptr); /* Defeat write posting */ return 0; }

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static unsigned long write_32(unsigned long addr, unsigned long h, unsigned long data) { void __iomem *ptr = (void __iomem *)addr; __raw_writel(intc_set_field_from_handle(0, data, h), ptr); (void)__raw_readl(ptr); /* Defeat write posting */ return 0; }

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static unsigned long modify_8(unsigned long addr, unsigned long h, unsigned long data) { void __iomem *ptr = (void __iomem *)addr; unsigned long flags; unsigned int value; local_irq_save(flags); value = intc_set_field_from_handle(__raw_readb(ptr), data, h); __raw_writeb(value, ptr); (void)__raw_readb(ptr); /* Defeat write posting */ local_irq_restore(flags); return 0; }

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static unsigned long modify_16(unsigned long addr, unsigned long h, unsigned long data) { void __iomem *ptr = (void __iomem *)addr; unsigned long flags; unsigned int value; local_irq_save(flags); value = intc_set_field_from_handle(__raw_readw(ptr), data, h); __raw_writew(value, ptr); (void)__raw_readw(ptr); /* Defeat write posting */ local_irq_restore(flags); return 0; }

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static unsigned long modify_32(unsigned long addr, unsigned long h, unsigned long data) { void __iomem *ptr = (void __iomem *)addr; unsigned long flags; unsigned int value; local_irq_save(flags); value = intc_set_field_from_handle(__raw_readl(ptr), data, h); __raw_writel(value, ptr); (void)__raw_readl(ptr); /* Defeat write posting */ local_irq_restore(flags); return 0; }

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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, };

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Directory: drivers/sh/intc
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