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-mapping.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 
28 void __iomem *sregs_base;
29 void __iomem *scu_base_addr;
30 
31 static 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 
42 static 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 
51 static 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 
59 static void highbank_power_off(void)
60 {
61 	highbank_set_pwr_shutdown();
62 
63 	while (1)
64 		cpu_do_idle();
65 }
66 
67 static 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 
107 static struct notifier_block highbank_amba_nb = {
108 	.notifier_call = highbank_platform_notifier,
109 };
110 
111 static struct notifier_block highbank_platform_nb = {
112 	.notifier_call = highbank_platform_notifier,
113 };
114 
115 static struct platform_device highbank_cpuidle_device = {
116 	.name = "cpuidle-calxeda",
117 };
118 
119 static 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 }
133 static struct notifier_block hb_keys_nb = {
134 	.notifier_call = hb_keys_notifier,
135 };
136 
137 static 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 
158 static const char *const highbank_match[] __initconst = {
159 	"calxeda,highbank",
160 	"calxeda,ecx-2000",
161 	NULL,
162 };
163 
164 DT_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,
175 MACHINE_END
176