1 /* 2 * R8A7740 processor support 3 * 4 * Copyright (C) 2011 Renesas Solutions Corp. 5 * Copyright (C) 2011 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 6 * 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. 10 * 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. 15 */ 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/io.h> 19 #include <linux/irqchip.h> 20 #include <linux/irqchip/arm-gic.h> 21 #include <linux/of_platform.h> 22 23 #include <asm/mach/map.h> 24 #include <asm/mach/arch.h> 25 #include <asm/mach/time.h> 26 27 #include "common.h" 28 29 /* 30 * r8a7740 chip has lasting errata on MERAM buffer. 31 * this is work-around for it. 32 * see 33 * "Media RAM (MERAM)" on r8a7740 documentation 34 */ 35 #define MEBUFCNTR 0xFE950098 36 static void __init r8a7740_meram_workaround(void) 37 { 38 void __iomem *reg; 39 40 reg = ioremap_nocache(MEBUFCNTR, 4); 41 if (reg) { 42 iowrite32(0x01600164, reg); 43 iounmap(reg); 44 } 45 } 46 47 static void __init r8a7740_init_irq_of(void) 48 { 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); 52 53 irqchip_init(); 54 55 /* route signals to GIC */ 56 iowrite32(0x0, pfc_inta_ctrl); 57 58 /* 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 62 */ 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); 71 72 iounmap(intc_prio_base); 73 iounmap(intc_msk_base); 74 iounmap(pfc_inta_ctrl); 75 } 76 77 static void __init r8a7740_generic_init(void) 78 { 79 r8a7740_meram_workaround(); 80 81 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 82 } 83 84 static const char *const r8a7740_boards_compat_dt[] __initconst = { 85 "renesas,r8a7740", 86 NULL, 87 }; 88 89 DT_MACHINE_START(R8A7740_DT, "Generic R8A7740 (Flattened Device Tree)") 90 .l2c_aux_val = 0, 91 .l2c_aux_mask = ~0, 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, 97 MACHINE_END 98