1/*
2 * Copyright 2010-2011 Calxeda, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16#include <linux/clk.h>
17#include <linux/clkdev.h>
18#include <linux/clocksource.h>
19#include <linux/dma-mapping.h>
20#include <linux/input.h>
21#include <linux/io.h>
22#include <linux/irqchip.h>
23#include <linux/pl320-ipc.h>
24#include <linux/of.h>
25#include <linux/of_irq.h>
26#include <linux/of_platform.h>
27#include <linux/of_address.h>
28#include <linux/reboot.h>
29#include <linux/amba/bus.h>
30#include <linux/platform_device.h>
31
32#include <asm/psci.h>
33#include <asm/hardware/cache-l2x0.h>
34#include <asm/mach/arch.h>
35#include <asm/mach/map.h>
36
37#include "core.h"
38#include "sysregs.h"
39
40void __iomem *sregs_base;
41void __iomem *scu_base_addr;
42
43static void __init highbank_scu_map_io(void)
44{
45	unsigned long base;
46
47	/* Get SCU base */
48	asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
49
50	scu_base_addr = ioremap(base, SZ_4K);
51}
52
53
54static void highbank_l2c310_write_sec(unsigned long val, unsigned reg)
55{
56	if (reg == L2X0_CTRL)
57		highbank_smc1(0x102, val);
58	else
59		WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n",
60			  reg);
61}
62
63static void __init highbank_init_irq(void)
64{
65	irqchip_init();
66
67	if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
68		highbank_scu_map_io();
69}
70
71static void highbank_power_off(void)
72{
73	highbank_set_pwr_shutdown();
74
75	while (1)
76		cpu_do_idle();
77}
78
79static int highbank_platform_notifier(struct notifier_block *nb,
80				  unsigned long event, void *__dev)
81{
82	struct resource *res;
83	int reg = -1;
84	u32 val;
85	struct device *dev = __dev;
86
87	if (event != BUS_NOTIFY_ADD_DEVICE)
88		return NOTIFY_DONE;
89
90	if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
91		reg = 0xc;
92	else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
93		reg = 0x18;
94	else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
95		reg = 0x20;
96	else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
97		res = platform_get_resource(to_platform_device(dev),
98					    IORESOURCE_MEM, 0);
99		if (res) {
100			if (res->start == 0xfff50000)
101				reg = 0;
102			else if (res->start == 0xfff51000)
103				reg = 4;
104		}
105	}
106
107	if (reg < 0)
108		return NOTIFY_DONE;
109
110	if (of_property_read_bool(dev->of_node, "dma-coherent")) {
111		val = readl(sregs_base + reg);
112		writel(val | 0xff01, sregs_base + reg);
113		set_dma_ops(dev, &arm_coherent_dma_ops);
114	}
115
116	return NOTIFY_OK;
117}
118
119static struct notifier_block highbank_amba_nb = {
120	.notifier_call = highbank_platform_notifier,
121};
122
123static struct notifier_block highbank_platform_nb = {
124	.notifier_call = highbank_platform_notifier,
125};
126
127static struct platform_device highbank_cpuidle_device = {
128	.name = "cpuidle-calxeda",
129};
130
131static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data)
132{
133	u32 key = *(u32 *)data;
134
135	if (event != 0x1000)
136		return 0;
137
138	if (key == KEY_POWER)
139		orderly_poweroff(false);
140	else if (key == 0xffff)
141		ctrl_alt_del();
142
143	return 0;
144}
145static struct notifier_block hb_keys_nb = {
146	.notifier_call = hb_keys_notifier,
147};
148
149static void __init highbank_init(void)
150{
151	struct device_node *np;
152
153	/* Map system registers */
154	np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
155	sregs_base = of_iomap(np, 0);
156	WARN_ON(!sregs_base);
157
158	pm_power_off = highbank_power_off;
159	highbank_pm_init();
160
161	bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
162	bus_register_notifier(&amba_bustype, &highbank_amba_nb);
163
164	pl320_ipc_register_notifier(&hb_keys_nb);
165
166	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
167
168	if (psci_ops.cpu_suspend)
169		platform_device_register(&highbank_cpuidle_device);
170}
171
172static const char *const highbank_match[] __initconst = {
173	"calxeda,highbank",
174	"calxeda,ecx-2000",
175	NULL,
176};
177
178DT_MACHINE_START(HIGHBANK, "Highbank")
179#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
180	.dma_zone_size	= (4ULL * SZ_1G),
181#endif
182	.l2c_aux_val	= 0,
183	.l2c_aux_mask	= ~0,
184	.l2c_write_sec	= highbank_l2c310_write_sec,
185	.init_irq	= highbank_init_irq,
186	.init_machine	= highbank_init,
187	.dt_compat	= highbank_match,
188	.restart	= highbank_restart,
189MACHINE_END
190