1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2008-2009 ST-Ericsson SA
4 *
5 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
6 */
7 #include <linux/types.h>
8 #include <linux/init.h>
9 #include <linux/device.h>
10 #include <linux/amba/bus.h>
11 #include <linux/interrupt.h>
12 #include <linux/irq.h>
13 #include <linux/irqchip.h>
14 #include <linux/irqchip/arm-gic.h>
15 #include <linux/mfd/dbx500-prcmu.h>
16 #include <linux/platform_data/arm-ux500-pm.h>
17 #include <linux/platform_device.h>
18 #include <linux/io.h>
19 #include <linux/of.h>
20 #include <linux/of_address.h>
21 #include <linux/of_platform.h>
22 #include <linux/regulator/machine.h>
23
24 #include <asm/outercache.h>
25 #include <asm/hardware/cache-l2x0.h>
26 #include <asm/mach/map.h>
27 #include <asm/mach/arch.h>
28
29 #include "db8500-regs.h"
30 #include "pm_domains.h"
31
ux500_l2x0_unlock(void)32 static int __init ux500_l2x0_unlock(void)
33 {
34 int i;
35 struct device_node *np;
36 void __iomem *l2x0_base;
37
38 np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
39 l2x0_base = of_iomap(np, 0);
40 of_node_put(np);
41 if (!l2x0_base)
42 return -ENODEV;
43
44 /*
45 * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions
46 * apparently locks both caches before jumping to the kernel. The
47 * l2x0 core will not touch the unlock registers if the l2x0 is
48 * already enabled, so we do it right here instead. The PL310 has
49 * 8 sets of registers, one per possible CPU.
50 */
51 for (i = 0; i < 8; i++) {
52 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
53 i * L2X0_LOCKDOWN_STRIDE);
54 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
55 i * L2X0_LOCKDOWN_STRIDE);
56 }
57 iounmap(l2x0_base);
58 return 0;
59 }
60
ux500_l2c310_write_sec(unsigned long val,unsigned reg)61 static void ux500_l2c310_write_sec(unsigned long val, unsigned reg)
62 {
63 /*
64 * We can't write to secure registers as we are in non-secure
65 * mode, until we have some SMI service available.
66 */
67 }
68
69 /*
70 * FIXME: Should we set up the GPIO domain here?
71 *
72 * The problem is that we cannot put the interrupt resources into the platform
73 * device until the irqdomain has been added. Right now, we set the GIC interrupt
74 * domain from init_irq(), then load the gpio driver from
75 * core_initcall(nmk_gpio_init) and add the platform devices from
76 * arch_initcall(customize_machine).
77 *
78 * This feels fragile because it depends on the gpio device getting probed
79 * _before_ any device uses the gpio interrupts.
80 */
ux500_init_irq(void)81 static void __init ux500_init_irq(void)
82 {
83 struct device_node *np;
84 struct resource r;
85
86 irqchip_init();
87 prcmu_early_init();
88 np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu");
89 of_address_to_resource(np, 0, &r);
90 of_node_put(np);
91 if (!r.start) {
92 pr_err("could not find PRCMU base resource\n");
93 return;
94 }
95 ux500_pm_init(r.start, r.end-r.start);
96
97 /* Unlock before init */
98 ux500_l2x0_unlock();
99 outer_cache.write_sec = ux500_l2c310_write_sec;
100 }
101
ux500_restart(enum reboot_mode mode,const char * cmd)102 static void ux500_restart(enum reboot_mode mode, const char *cmd)
103 {
104 local_irq_disable();
105 local_fiq_disable();
106
107 prcmu_system_reset(0);
108 }
109
110 static const struct of_device_id u8500_local_bus_nodes[] = {
111 /* only create devices below soc node */
112 { .compatible = "stericsson,db8500", },
113 { .compatible = "simple-bus"},
114 { },
115 };
116
u8500_init_machine(void)117 static void __init u8500_init_machine(void)
118 {
119 /* Initialize ux500 power domains */
120 ux500_pm_domains_init();
121
122 of_platform_populate(NULL, u8500_local_bus_nodes,
123 NULL, NULL);
124 }
125
126 static const char * stericsson_dt_platform_compat[] = {
127 "st-ericsson,u8500",
128 "st-ericsson,u9500",
129 NULL,
130 };
131
132 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
133 .l2c_aux_val = 0,
134 .l2c_aux_mask = ~0,
135 .init_irq = ux500_init_irq,
136 .init_machine = u8500_init_machine,
137 .dt_compat = stericsson_dt_platform_compat,
138 .restart = ux500_restart,
139 MACHINE_END
140