| /* |
| * ARC HSDK Platform support code |
| * |
| * Copyright (C) 2017 Synopsys, Inc. (www.synopsys.com) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/smp.h> |
| #include <asm/arcregs.h> |
| #include <asm/io.h> |
| #include <asm/mach_desc.h> |
| |
| #define ARC_CCM_UNUSED_ADDR 0x60000000 |
| |
| static void __init hsdk_init_per_cpu(unsigned int cpu) |
| { |
| /* |
| * By default ICCM is mapped to 0x7z while this area is used for |
| * kernel virtual mappings, so move it to currently unused area. |
| */ |
| if (cpuinfo_arc700[cpu].iccm.sz) |
| write_aux_reg(ARC_REG_AUX_ICCM, ARC_CCM_UNUSED_ADDR); |
| |
| /* |
| * By default DCCM is mapped to 0x8z while this area is used by kernel, |
| * so move it to currently unused area. |
| */ |
| if (cpuinfo_arc700[cpu].dccm.sz) |
| write_aux_reg(ARC_REG_AUX_DCCM, ARC_CCM_UNUSED_ADDR); |
| } |
| |
| #define ARC_PERIPHERAL_BASE 0xf0000000 |
| #define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000) |
| #define CREG_PAE (CREG_BASE + 0x180) |
| #define CREG_PAE_UPDATE (CREG_BASE + 0x194) |
| |
| static void __init hsdk_init_early(void) |
| { |
| /* |
| * PAE remapping for DMA clients does not work due to an RTL bug, so |
| * CREG_PAE register must be programmed to all zeroes, otherwise it |
| * will cause problems with DMA to/from peripherals even if PAE40 is |
| * not used. |
| */ |
| |
| /* Default is 1, which means "PAE offset = 4GByte" */ |
| writel_relaxed(0, (void __iomem *) CREG_PAE); |
| |
| /* Really apply settings made above */ |
| writel(1, (void __iomem *) CREG_PAE_UPDATE); |
| } |
| |
| static const char *hsdk_compat[] __initconst = { |
| "snps,hsdk", |
| NULL, |
| }; |
| |
| MACHINE_START(SIMULATION, "hsdk") |
| .dt_compat = hsdk_compat, |
| .init_early = hsdk_init_early, |
| .init_per_cpu = hsdk_init_per_cpu, |
| MACHINE_END |
