| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 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_nocache(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_nocache(0xe6900010, 0x10); |
| 41 | void __iomem *intc_msk_base = ioremap_nocache(0xe6900040, 0x10); |
| 42 | void __iomem *pfc_inta_ctrl = ioremap_nocache(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 |