cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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of_device_common.c (4061B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2#include <linux/string.h>
      3#include <linux/kernel.h>
      4#include <linux/of.h>
      5#include <linux/export.h>
      6#include <linux/mod_devicetable.h>
      7#include <linux/errno.h>
      8#include <linux/irq.h>
      9#include <linux/of_platform.h>
     10#include <linux/of_address.h>
     11#include <linux/of_device.h>
     12#include <linux/of_irq.h>
     13
     14#include "of_device_common.h"
     15
     16unsigned int irq_of_parse_and_map(struct device_node *node, int index)
     17{
     18	struct platform_device *op = of_find_device_by_node(node);
     19
     20	if (!op || index >= op->archdata.num_irqs)
     21		return 0;
     22
     23	return op->archdata.irqs[index];
     24}
     25EXPORT_SYMBOL(irq_of_parse_and_map);
     26
     27int of_address_to_resource(struct device_node *node, int index,
     28			   struct resource *r)
     29{
     30	struct platform_device *op = of_find_device_by_node(node);
     31
     32	if (!op || index >= op->num_resources)
     33		return -EINVAL;
     34
     35	memcpy(r, &op->archdata.resource[index], sizeof(*r));
     36	return 0;
     37}
     38EXPORT_SYMBOL_GPL(of_address_to_resource);
     39
     40void __iomem *of_iomap(struct device_node *node, int index)
     41{
     42	struct platform_device *op = of_find_device_by_node(node);
     43	struct resource *r;
     44
     45	if (!op || index >= op->num_resources)
     46		return NULL;
     47
     48	r = &op->archdata.resource[index];
     49
     50	return of_ioremap(r, 0, resource_size(r), (char *) r->name);
     51}
     52EXPORT_SYMBOL(of_iomap);
     53
     54/* Take the archdata values for IOMMU, STC, and HOSTDATA found in
     55 * BUS and propagate to all child platform_device objects.
     56 */
     57void of_propagate_archdata(struct platform_device *bus)
     58{
     59	struct dev_archdata *bus_sd = &bus->dev.archdata;
     60	struct device_node *bus_dp = bus->dev.of_node;
     61	struct device_node *dp;
     62
     63	for (dp = bus_dp->child; dp; dp = dp->sibling) {
     64		struct platform_device *op = of_find_device_by_node(dp);
     65
     66		op->dev.archdata.iommu = bus_sd->iommu;
     67		op->dev.archdata.stc = bus_sd->stc;
     68		op->dev.archdata.host_controller = bus_sd->host_controller;
     69		op->dev.archdata.numa_node = bus_sd->numa_node;
     70		op->dev.dma_ops = bus->dev.dma_ops;
     71
     72		if (dp->child)
     73			of_propagate_archdata(op);
     74	}
     75}
     76
     77static void get_cells(struct device_node *dp, int *addrc, int *sizec)
     78{
     79	if (addrc)
     80		*addrc = of_n_addr_cells(dp);
     81	if (sizec)
     82		*sizec = of_n_size_cells(dp);
     83}
     84
     85/*
     86 * Default translator (generic bus)
     87 */
     88
     89void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
     90{
     91	get_cells(dev, addrc, sizec);
     92}
     93
     94/* Make sure the least significant 64-bits are in-range.  Even
     95 * for 3 or 4 cell values it is a good enough approximation.
     96 */
     97int of_out_of_range(const u32 *addr, const u32 *base,
     98		    const u32 *size, int na, int ns)
     99{
    100	u64 a = of_read_addr(addr, na);
    101	u64 b = of_read_addr(base, na);
    102
    103	if (a < b)
    104		return 1;
    105
    106	b += of_read_addr(size, ns);
    107	if (a >= b)
    108		return 1;
    109
    110	return 0;
    111}
    112
    113int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
    114{
    115	u32 result[OF_MAX_ADDR_CELLS];
    116	int i;
    117
    118	if (ns > 2) {
    119		printk("of_device: Cannot handle size cells (%d) > 2.", ns);
    120		return -EINVAL;
    121	}
    122
    123	if (of_out_of_range(addr, range, range + na + pna, na, ns))
    124		return -EINVAL;
    125
    126	/* Start with the parent range base.  */
    127	memcpy(result, range + na, pna * 4);
    128
    129	/* Add in the child address offset.  */
    130	for (i = 0; i < na; i++)
    131		result[pna - 1 - i] +=
    132			(addr[na - 1 - i] -
    133			 range[na - 1 - i]);
    134
    135	memcpy(addr, result, pna * 4);
    136
    137	return 0;
    138}
    139
    140unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
    141{
    142	if (flags)
    143		return flags;
    144	return IORESOURCE_MEM;
    145}
    146
    147/*
    148 * SBUS bus specific translator
    149 */
    150
    151int of_bus_sbus_match(struct device_node *np)
    152{
    153	struct device_node *dp = np;
    154
    155	while (dp) {
    156		if (of_node_name_eq(dp, "sbus") ||
    157		    of_node_name_eq(dp, "sbi"))
    158			return 1;
    159
    160		/* Have a look at use_1to1_mapping().  We're trying
    161		 * to match SBUS if that's the top-level bus and we
    162		 * don't have some intervening real bus that provides
    163		 * ranges based translations.
    164		 */
    165		if (of_find_property(dp, "ranges", NULL) != NULL)
    166			break;
    167
    168		dp = dp->parent;
    169	}
    170
    171	return 0;
    172}
    173
    174void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
    175{
    176	if (addrc)
    177		*addrc = 2;
    178	if (sizec)
    179		*sizec = 1;
    180}