1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * R8A7740 processor support
4  *
5  * Copyright (C) 2011  Renesas Solutions Corp.
6  * Copyright (C) 2011  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7  */
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/io.h>
11 #include <linux/irqchip.h>
12 #include <linux/irqchip/arm-gic.h>
13 
14 #include <asm/mach/map.h>
15 #include <asm/mach/arch.h>
16 #include <asm/mach/time.h>
17 
18 #include "common.h"
19 
20 /*
21  * r8a7740 chip has lasting errata on MERAM buffer.
22  * this is work-around for it.
23  * see
24  *	"Media RAM (MERAM)" on r8a7740 documentation
25  */
26 #define MEBUFCNTR	0xFE950098
27 static void __init r8a7740_meram_workaround(void)
28 {
29 	void __iomem *reg;
30 
31 	reg = ioremap(MEBUFCNTR, 4);
32 	if (reg) {
33 		iowrite32(0x01600164, reg);
34 		iounmap(reg);
35 	}
36 }
37 
38 static void __init r8a7740_init_irq_of(void)
39 {
40 	void __iomem *intc_prio_base = ioremap(0xe6900010, 0x10);
41 	void __iomem *intc_msk_base = ioremap(0xe6900040, 0x10);
42 	void __iomem *pfc_inta_ctrl = ioremap(0xe605807c, 0x4);
43 
44 	irqchip_init();
45 
46 	/* route signals to GIC */
47 	iowrite32(0x0, pfc_inta_ctrl);
48 
49 	/*
50 	 * To mask the shared interrupt to SPI 149 we must ensure to set
51 	 * PRIO *and* MASK. Else we run into IRQ floods when registering
52 	 * the intc_irqpin devices
53 	 */
54 	iowrite32(0x0, intc_prio_base + 0x0);
55 	iowrite32(0x0, intc_prio_base + 0x4);
56 	iowrite32(0x0, intc_prio_base + 0x8);
57 	iowrite32(0x0, intc_prio_base + 0xc);
58 	iowrite8(0xff, intc_msk_base + 0x0);
59 	iowrite8(0xff, intc_msk_base + 0x4);
60 	iowrite8(0xff, intc_msk_base + 0x8);
61 	iowrite8(0xff, intc_msk_base + 0xc);
62 
63 	iounmap(intc_prio_base);
64 	iounmap(intc_msk_base);
65 	iounmap(pfc_inta_ctrl);
66 }
67 
68 static void __init r8a7740_generic_init(void)
69 {
70 	r8a7740_meram_workaround();
71 }
72 
73 static const char *const r8a7740_boards_compat_dt[] __initconst = {
74 	"renesas,r8a7740",
75 	NULL,
76 };
77 
78 DT_MACHINE_START(R8A7740_DT, "Generic R8A7740 (Flattened Device Tree)")
79 	.l2c_aux_val	= 0,
80 	.l2c_aux_mask	= ~0,
81 	.init_early	= shmobile_init_delay,
82 	.init_irq	= r8a7740_init_irq_of,
83 	.init_machine	= r8a7740_generic_init,
84 	.init_late	= shmobile_init_late,
85 	.dt_compat	= r8a7740_boards_compat_dt,
86 MACHINE_END
87