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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highbank.c (3945B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2010-2011 Calxeda, Inc.
      4 */
      5#include <linux/clk.h>
      6#include <linux/clkdev.h>
      7#include <linux/clocksource.h>
      8#include <linux/dma-map-ops.h>
      9#include <linux/input.h>
     10#include <linux/io.h>
     11#include <linux/irqchip.h>
     12#include <linux/pl320-ipc.h>
     13#include <linux/of.h>
     14#include <linux/of_irq.h>
     15#include <linux/of_address.h>
     16#include <linux/reboot.h>
     17#include <linux/amba/bus.h>
     18#include <linux/platform_device.h>
     19#include <linux/psci.h>
     20
     21#include <asm/hardware/cache-l2x0.h>
     22#include <asm/mach/arch.h>
     23#include <asm/mach/map.h>
     24
     25#include "core.h"
     26#include "sysregs.h"
     27
     28void __iomem *sregs_base;
     29void __iomem *scu_base_addr;
     30
     31static void __init highbank_scu_map_io(void)
     32{
     33	unsigned long base;
     34
     35	/* Get SCU base */
     36	asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
     37
     38	scu_base_addr = ioremap(base, SZ_4K);
     39}
     40
     41
     42static void highbank_l2c310_write_sec(unsigned long val, unsigned reg)
     43{
     44	if (reg == L2X0_CTRL)
     45		highbank_smc1(0x102, val);
     46	else
     47		WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n",
     48			  reg);
     49}
     50
     51static void __init highbank_init_irq(void)
     52{
     53	irqchip_init();
     54
     55	if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
     56		highbank_scu_map_io();
     57}
     58
     59static void highbank_power_off(void)
     60{
     61	highbank_set_pwr_shutdown();
     62
     63	while (1)
     64		cpu_do_idle();
     65}
     66
     67static int highbank_platform_notifier(struct notifier_block *nb,
     68				  unsigned long event, void *__dev)
     69{
     70	struct resource *res;
     71	int reg = -1;
     72	u32 val;
     73	struct device *dev = __dev;
     74
     75	if (event != BUS_NOTIFY_ADD_DEVICE)
     76		return NOTIFY_DONE;
     77
     78	if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
     79		reg = 0xc;
     80	else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
     81		reg = 0x18;
     82	else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
     83		reg = 0x20;
     84	else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
     85		res = platform_get_resource(to_platform_device(dev),
     86					    IORESOURCE_MEM, 0);
     87		if (res) {
     88			if (res->start == 0xfff50000)
     89				reg = 0;
     90			else if (res->start == 0xfff51000)
     91				reg = 4;
     92		}
     93	}
     94
     95	if (reg < 0)
     96		return NOTIFY_DONE;
     97
     98	if (of_property_read_bool(dev->of_node, "dma-coherent")) {
     99		val = readl(sregs_base + reg);
    100		writel(val | 0xff01, sregs_base + reg);
    101		set_dma_ops(dev, &arm_coherent_dma_ops);
    102	}
    103
    104	return NOTIFY_OK;
    105}
    106
    107static struct notifier_block highbank_amba_nb = {
    108	.notifier_call = highbank_platform_notifier,
    109};
    110
    111static struct notifier_block highbank_platform_nb = {
    112	.notifier_call = highbank_platform_notifier,
    113};
    114
    115static struct platform_device highbank_cpuidle_device = {
    116	.name = "cpuidle-calxeda",
    117};
    118
    119static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data)
    120{
    121	u32 key = *(u32 *)data;
    122
    123	if (event != 0x1000)
    124		return 0;
    125
    126	if (key == KEY_POWER)
    127		orderly_poweroff(false);
    128	else if (key == 0xffff)
    129		ctrl_alt_del();
    130
    131	return 0;
    132}
    133static struct notifier_block hb_keys_nb = {
    134	.notifier_call = hb_keys_notifier,
    135};
    136
    137static void __init highbank_init(void)
    138{
    139	struct device_node *np;
    140
    141	/* Map system registers */
    142	np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
    143	sregs_base = of_iomap(np, 0);
    144	WARN_ON(!sregs_base);
    145
    146	pm_power_off = highbank_power_off;
    147	highbank_pm_init();
    148
    149	bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
    150	bus_register_notifier(&amba_bustype, &highbank_amba_nb);
    151
    152	pl320_ipc_register_notifier(&hb_keys_nb);
    153
    154	if (psci_ops.cpu_suspend)
    155		platform_device_register(&highbank_cpuidle_device);
    156}
    157
    158static const char *const highbank_match[] __initconst = {
    159	"calxeda,highbank",
    160	"calxeda,ecx-2000",
    161	NULL,
    162};
    163
    164DT_MACHINE_START(HIGHBANK, "Highbank")
    165#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
    166	.dma_zone_size	= (4ULL * SZ_1G),
    167#endif
    168	.l2c_aux_val	= 0,
    169	.l2c_aux_mask	= ~0,
    170	.l2c_write_sec	= highbank_l2c310_write_sec,
    171	.init_irq	= highbank_init_irq,
    172	.init_machine	= highbank_init,
    173	.dt_compat	= highbank_match,
    174	.restart	= highbank_restart,
    175MACHINE_END