xref: /linux/arch/mips/econet/init.c (revision 67faad74352d1ce0c1f411f92fdb1e0c0f3c9380) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * EcoNet setup code
4  *
5  * Copyright (C) 2025 Caleb James DeLisle <cjd@cjdns.fr>
6  */
7 
8 #include <linux/init.h>
9 #include <linux/of_clk.h>
10 #include <linux/irqchip.h>
11 
12 #include <asm/addrspace.h>
13 #include <asm/io.h>
14 #include <asm/bootinfo.h>
15 #include <asm/time.h>
16 #include <asm/prom.h>
17 #include <asm/smp-ops.h>
18 #include <asm/reboot.h>
19 
20 #define CR_AHB_RSTCR		((void __iomem *)CKSEG1ADDR(0x1fb00040))
21 #define RESET			BIT(31)
22 
23 #define UART_BASE		CKSEG1ADDR(0x1fbf0003)
24 #define UART_REG_SHIFT		2
25 
hw_reset(char * command)26 static void hw_reset(char *command)
27 {
28 	iowrite32(RESET, CR_AHB_RSTCR);
29 }
30 
31 /* 1. Bring up early printk. */
prom_init(void)32 void __init prom_init(void)
33 {
34 	setup_8250_early_printk_port(UART_BASE, UART_REG_SHIFT, 0);
35 	_machine_restart = hw_reset;
36 }
37 
38 /* 2. Parse the DT and find memory */
plat_mem_setup(void)39 void __init plat_mem_setup(void)
40 {
41 	void *dtb;
42 
43 	set_io_port_base(KSEG1);
44 
45 	dtb = get_fdt();
46 	if (!dtb)
47 		panic("no dtb found");
48 
49 	__dt_setup_arch(dtb);
50 
51 	early_init_dt_scan_memory();
52 }
53 
54 /* 3. Overload __weak device_tree_init(), add SMP_UP ops */
device_tree_init(void)55 void __init device_tree_init(void)
56 {
57 	unflatten_and_copy_device_tree();
58 
59 	register_up_smp_ops();
60 }
61 
get_system_type(void)62 const char *get_system_type(void)
63 {
64 	return "EcoNet-EN75xx";
65 }
66 
67 /* 4. Initialize the IRQ subsystem */
arch_init_irq(void)68 void __init arch_init_irq(void)
69 {
70 	irqchip_init();
71 }
72 
73 /* 5. Timers */
plat_time_init(void)74 void __init plat_time_init(void)
75 {
76 	of_clk_init(NULL);
77 	timer_probe();
78 }
79