1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* EcoNet setup code
*
* Copyright (C) 2025 Caleb James DeLisle <cjd@cjdns.fr>
*/
#include <linux/init.h>
#include <linux/of_clk.h>
#include <linux/irqchip.h>
#include <asm/addrspace.h>
#include <asm/io.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/prom.h>
#include <asm/smp-ops.h>
#include <asm/reboot.h>
#define CR_AHB_RSTCR ((void __iomem *)CKSEG1ADDR(0x1fb00040))
#define RESET BIT(31)
#define UART_BASE CKSEG1ADDR(0x1fbf0003)
#define UART_REG_SHIFT 2
static void hw_reset(char *command)
{
iowrite32(RESET, CR_AHB_RSTCR);
}
/* 1. Bring up early printk. */
void __init prom_init(void)
{
setup_8250_early_printk_port(UART_BASE, UART_REG_SHIFT, 0);
_machine_restart = hw_reset;
}
/* 2. Parse the DT and find memory */
void __init plat_mem_setup(void)
{
void *dtb;
set_io_port_base(KSEG1);
dtb = get_fdt();
if (!dtb)
panic("no dtb found");
__dt_setup_arch(dtb);
early_init_dt_scan_memory();
}
/* 3. Overload __weak device_tree_init(), add SMP_UP ops */
void __init device_tree_init(void)
{
unflatten_and_copy_device_tree();
register_up_smp_ops();
}
const char *get_system_type(void)
{
return "EcoNet-EN75xx";
}
/* 4. Initialize the IRQ subsystem */
void __init arch_init_irq(void)
{
irqchip_init();
}
/* 5. Timers */
void __init plat_time_init(void)
{
of_clk_init(NULL);
timer_probe();
}
|
