| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2015 Imagination Technologies |
| * Author: Paul Burton <paul.burton@mips.com> |
| */ |
| |
| #include <linux/bug.h> |
| #include <linux/kernel.h> |
| #include <linux/libfdt.h> |
| #include <linux/of_fdt.h> |
| #include <linux/sizes.h> |
| #include <asm/addrspace.h> |
| #include <asm/bootinfo.h> |
| #include <asm/fw/fw.h> |
| #include <asm/mips-boards/generic.h> |
| #include <asm/mips-boards/malta.h> |
| #include <asm/mips-cps.h> |
| #include <asm/page.h> |
| |
| #define ROCIT_REG_BASE 0x1f403000 |
| #define ROCIT_CONFIG_GEN1 (ROCIT_REG_BASE + 0x04) |
| #define ROCIT_CONFIG_GEN1_MEMMAP_SHIFT 8 |
| #define ROCIT_CONFIG_GEN1_MEMMAP_MASK (0xf << 8) |
| |
| static unsigned char fdt_buf[16 << 10] __initdata __aligned(8); |
| |
| /* determined physical memory size, not overridden by command line args */ |
| extern unsigned long physical_memsize; |
| |
| enum mem_map { |
| MEM_MAP_V1 = 0, |
| MEM_MAP_V2, |
| }; |
| |
| #define MAX_MEM_ARRAY_ENTRIES 2 |
| |
| static __init int malta_scon(void) |
| { |
| int scon = MIPS_REVISION_SCONID; |
| |
| if (scon != MIPS_REVISION_SCON_OTHER) |
| return scon; |
| |
| switch (MIPS_REVISION_CORID) { |
| case MIPS_REVISION_CORID_QED_RM5261: |
| case MIPS_REVISION_CORID_CORE_LV: |
| case MIPS_REVISION_CORID_CORE_FPGA: |
| case MIPS_REVISION_CORID_CORE_FPGAR2: |
| return MIPS_REVISION_SCON_GT64120; |
| |
| case MIPS_REVISION_CORID_CORE_EMUL_BON: |
| case MIPS_REVISION_CORID_BONITO64: |
| case MIPS_REVISION_CORID_CORE_20K: |
| return MIPS_REVISION_SCON_BONITO; |
| |
| case MIPS_REVISION_CORID_CORE_MSC: |
| case MIPS_REVISION_CORID_CORE_FPGA2: |
| case MIPS_REVISION_CORID_CORE_24K: |
| return MIPS_REVISION_SCON_SOCIT; |
| |
| case MIPS_REVISION_CORID_CORE_FPGA3: |
| case MIPS_REVISION_CORID_CORE_FPGA4: |
| case MIPS_REVISION_CORID_CORE_FPGA5: |
| case MIPS_REVISION_CORID_CORE_EMUL_MSC: |
| default: |
| return MIPS_REVISION_SCON_ROCIT; |
| } |
| } |
| |
| static unsigned __init gen_fdt_mem_array(__be32 *mem_array, unsigned long size, |
| enum mem_map map) |
| { |
| unsigned long size_preio; |
| unsigned entries; |
| |
| entries = 1; |
| mem_array[0] = cpu_to_be32(PHYS_OFFSET); |
| if (IS_ENABLED(CONFIG_EVA)) { |
| /* |
| * The current Malta EVA configuration is "special" in that it |
| * always makes use of addresses in the upper half of the 32 bit |
| * physical address map, which gives it a contiguous region of |
| * DDR but limits it to 2GB. |
| */ |
| mem_array[1] = cpu_to_be32(size); |
| goto done; |
| } |
| |
| size_preio = min_t(unsigned long, size, SZ_256M); |
| mem_array[1] = cpu_to_be32(size_preio); |
| size -= size_preio; |
| if (!size) |
| goto done; |
| |
| if (map == MEM_MAP_V2) { |
| /* |
| * We have a flat 32 bit physical memory map with DDR filling |
| * all 4GB of the memory map, apart from the I/O region which |
| * obscures 256MB from 0x10000000-0x1fffffff. |
| * |
| * Therefore we discard the 256MB behind the I/O region. |
| */ |
| if (size <= SZ_256M) |
| goto done; |
| size -= SZ_256M; |
| |
| /* Make use of the memory following the I/O region */ |
| entries++; |
| mem_array[2] = cpu_to_be32(PHYS_OFFSET + SZ_512M); |
| mem_array[3] = cpu_to_be32(size); |
| } else { |
| /* |
| * We have a 32 bit physical memory map with a 2GB DDR region |
| * aliased in the upper & lower halves of it. The I/O region |
| * obscures 256MB from 0x10000000-0x1fffffff in the low alias |
| * but the DDR it obscures is accessible via the high alias. |
| * |
| * Simply access everything beyond the lowest 256MB of DDR using |
| * the high alias. |
| */ |
| entries++; |
| mem_array[2] = cpu_to_be32(PHYS_OFFSET + SZ_2G + SZ_256M); |
| mem_array[3] = cpu_to_be32(size); |
| } |
| |
| done: |
| BUG_ON(entries > MAX_MEM_ARRAY_ENTRIES); |
| return entries; |
| } |
| |
| static void __init append_memory(void *fdt, int root_off) |
| { |
| __be32 mem_array[2 * MAX_MEM_ARRAY_ENTRIES]; |
| unsigned long memsize; |
| unsigned mem_entries; |
| int i, err, mem_off; |
| enum mem_map mem_map; |
| u32 config; |
| char *var, param_name[10], *var_names[] = { |
| "ememsize", "memsize", |
| }; |
| |
| /* if a memory node already exists, leave it alone */ |
| mem_off = fdt_path_offset(fdt, "/memory"); |
| if (mem_off >= 0) |
| return; |
| |
| /* find memory size from the bootloader environment */ |
| for (i = 0; i < ARRAY_SIZE(var_names); i++) { |
| var = fw_getenv(var_names[i]); |
| if (!var) |
| continue; |
| |
| err = kstrtoul(var, 0, &physical_memsize); |
| if (!err) |
| break; |
| |
| pr_warn("Failed to read the '%s' env variable '%s'\n", |
| var_names[i], var); |
| } |
| |
| if (!physical_memsize) { |
| pr_warn("The bootloader didn't provide memsize: defaulting to 32MB\n"); |
| physical_memsize = 32 << 20; |
| } |
| |
| if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) { |
| /* |
| * SOC-it swaps, or perhaps doesn't swap, when DMA'ing |
| * the last word of physical memory. |
| */ |
| physical_memsize -= PAGE_SIZE; |
| } |
| |
| /* default to using all available RAM */ |
| memsize = physical_memsize; |
| |
| /* allow the user to override the usable memory */ |
| for (i = 0; i < ARRAY_SIZE(var_names); i++) { |
| snprintf(param_name, sizeof(param_name), "%s=", var_names[i]); |
| var = strstr(arcs_cmdline, param_name); |
| if (!var) |
| continue; |
| |
| memsize = memparse(var + strlen(param_name), NULL); |
| } |
| |
| /* if the user says there's more RAM than we thought, believe them */ |
| physical_memsize = max_t(unsigned long, physical_memsize, memsize); |
| |
| /* detect the memory map in use */ |
| if (malta_scon() == MIPS_REVISION_SCON_ROCIT) { |
| /* ROCit has a register indicating the memory map in use */ |
| config = readl((void __iomem *)CKSEG1ADDR(ROCIT_CONFIG_GEN1)); |
| mem_map = config & ROCIT_CONFIG_GEN1_MEMMAP_MASK; |
| mem_map >>= ROCIT_CONFIG_GEN1_MEMMAP_SHIFT; |
| } else { |
| /* if not using ROCit, presume the v1 memory map */ |
| mem_map = MEM_MAP_V1; |
| } |
| if (mem_map > MEM_MAP_V2) |
| panic("Unsupported physical memory map v%u detected", |
| (unsigned int)mem_map); |
| |
| /* append memory to the DT */ |
| mem_off = fdt_add_subnode(fdt, root_off, "memory"); |
| if (mem_off < 0) |
| panic("Unable to add memory node to DT: %d", mem_off); |
| |
| err = fdt_setprop_string(fdt, mem_off, "device_type", "memory"); |
| if (err) |
| panic("Unable to set memory node device_type: %d", err); |
| |
| mem_entries = gen_fdt_mem_array(mem_array, physical_memsize, mem_map); |
| err = fdt_setprop(fdt, mem_off, "reg", mem_array, |
| mem_entries * 2 * sizeof(mem_array[0])); |
| if (err) |
| panic("Unable to set memory regs property: %d", err); |
| |
| mem_entries = gen_fdt_mem_array(mem_array, memsize, mem_map); |
| err = fdt_setprop(fdt, mem_off, "linux,usable-memory", mem_array, |
| mem_entries * 2 * sizeof(mem_array[0])); |
| if (err) |
| panic("Unable to set linux,usable-memory property: %d", err); |
| } |
| |
| static void __init remove_gic(void *fdt) |
| { |
| int err, gic_off, i8259_off, cpu_off; |
| void __iomem *biu_base; |
| uint32_t cpu_phandle, sc_cfg; |
| |
| /* if we have a CM which reports a GIC is present, leave the DT alone */ |
| err = mips_cm_probe(); |
| if (!err && (read_gcr_gic_status() & CM_GCR_GIC_STATUS_EX)) |
| return; |
| |
| if (malta_scon() == MIPS_REVISION_SCON_ROCIT) { |
| /* |
| * On systems using the RocIT system controller a GIC may be |
| * present without a CM. Detect whether that is the case. |
| */ |
| biu_base = ioremap_nocache(MSC01_BIU_REG_BASE, |
| MSC01_BIU_ADDRSPACE_SZ); |
| sc_cfg = __raw_readl(biu_base + MSC01_SC_CFG_OFS); |
| if (sc_cfg & MSC01_SC_CFG_GICPRES_MSK) { |
| /* enable the GIC at the system controller level */ |
| sc_cfg |= BIT(MSC01_SC_CFG_GICENA_SHF); |
| __raw_writel(sc_cfg, biu_base + MSC01_SC_CFG_OFS); |
| return; |
| } |
| } |
| |
| gic_off = fdt_node_offset_by_compatible(fdt, -1, "mti,gic"); |
| if (gic_off < 0) { |
| pr_warn("malta-dtshim: unable to find DT GIC node: %d\n", |
| gic_off); |
| return; |
| } |
| |
| err = fdt_nop_node(fdt, gic_off); |
| if (err) |
| pr_warn("malta-dtshim: unable to nop GIC node\n"); |
| |
| i8259_off = fdt_node_offset_by_compatible(fdt, -1, "intel,i8259"); |
| if (i8259_off < 0) { |
| pr_warn("malta-dtshim: unable to find DT i8259 node: %d\n", |
| i8259_off); |
| return; |
| } |
| |
| cpu_off = fdt_node_offset_by_compatible(fdt, -1, |
| "mti,cpu-interrupt-controller"); |
| if (cpu_off < 0) { |
| pr_warn("malta-dtshim: unable to find CPU intc node: %d\n", |
| cpu_off); |
| return; |
| } |
| |
| cpu_phandle = fdt_get_phandle(fdt, cpu_off); |
| if (!cpu_phandle) { |
| pr_warn("malta-dtshim: unable to get CPU intc phandle\n"); |
| return; |
| } |
| |
| err = fdt_setprop_u32(fdt, i8259_off, "interrupt-parent", cpu_phandle); |
| if (err) { |
| pr_warn("malta-dtshim: unable to set i8259 interrupt-parent: %d\n", |
| err); |
| return; |
| } |
| |
| err = fdt_setprop_u32(fdt, i8259_off, "interrupts", 2); |
| if (err) { |
| pr_warn("malta-dtshim: unable to set i8259 interrupts: %d\n", |
| err); |
| return; |
| } |
| } |
| |
| void __init *malta_dt_shim(void *fdt) |
| { |
| int root_off, len, err; |
| const char *compat; |
| |
| if (fdt_check_header(fdt)) |
| panic("Corrupt DT"); |
| |
| err = fdt_open_into(fdt, fdt_buf, sizeof(fdt_buf)); |
| if (err) |
| panic("Unable to open FDT: %d", err); |
| |
| root_off = fdt_path_offset(fdt_buf, "/"); |
| if (root_off < 0) |
| panic("No / node in DT"); |
| |
| compat = fdt_getprop(fdt_buf, root_off, "compatible", &len); |
| if (!compat) |
| panic("No root compatible property in DT: %d", len); |
| |
| /* if this isn't Malta, leave the DT alone */ |
| if (strncmp(compat, "mti,malta", len)) |
| return fdt; |
| |
| append_memory(fdt_buf, root_off); |
| remove_gic(fdt_buf); |
| |
| err = fdt_pack(fdt_buf); |
| if (err) |
| panic("Unable to pack FDT: %d\n", err); |
| |
| return fdt_buf; |
| } |