2 * R8A7740 processor support
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Copyright (C) 2011 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
19 #include <linux/irqchip.h>
20 #include <linux/irqchip/arm-gic.h>
21 #include <linux/of_platform.h>
23 #include <asm/mach/map.h>
24 #include <asm/mach/arch.h>
25 #include <asm/mach/time.h>
30 * r8a7740 chip has lasting errata on MERAM buffer.
31 * this is work-around for it.
33 * "Media RAM (MERAM)" on r8a7740 documentation
35 #define MEBUFCNTR 0xFE950098
36 static void __init r8a7740_meram_workaround(void)
40 reg = ioremap_nocache(MEBUFCNTR, 4);
42 iowrite32(0x01600164, reg);
47 static void __init r8a7740_init_irq_of(void)
49 void __iomem *intc_prio_base = ioremap_nocache(0xe6900010, 0x10);
50 void __iomem *intc_msk_base = ioremap_nocache(0xe6900040, 0x10);
51 void __iomem *pfc_inta_ctrl = ioremap_nocache(0xe605807c, 0x4);
55 /* route signals to GIC */
56 iowrite32(0x0, pfc_inta_ctrl);
59 * To mask the shared interrupt to SPI 149 we must ensure to set
60 * PRIO *and* MASK. Else we run into IRQ floods when registering
61 * the intc_irqpin devices
63 iowrite32(0x0, intc_prio_base + 0x0);
64 iowrite32(0x0, intc_prio_base + 0x4);
65 iowrite32(0x0, intc_prio_base + 0x8);
66 iowrite32(0x0, intc_prio_base + 0xc);
67 iowrite8(0xff, intc_msk_base + 0x0);
68 iowrite8(0xff, intc_msk_base + 0x4);
69 iowrite8(0xff, intc_msk_base + 0x8);
70 iowrite8(0xff, intc_msk_base + 0xc);
72 iounmap(intc_prio_base);
73 iounmap(intc_msk_base);
74 iounmap(pfc_inta_ctrl);
77 static void __init r8a7740_generic_init(void)
79 r8a7740_meram_workaround();
81 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
84 static const char *const r8a7740_boards_compat_dt[] __initconst = {
89 DT_MACHINE_START(R8A7740_DT, "Generic R8A7740 (Flattened Device Tree)")
92 .init_early = shmobile_init_delay,
93 .init_irq = r8a7740_init_irq_of,
94 .init_machine = r8a7740_generic_init,
95 .init_late = shmobile_init_late,
96 .dt_compat = r8a7740_boards_compat_dt,