diff options
Diffstat (limited to 'arch/mips/mti-malta/malta-dtshim.c')
| -rw-r--r-- | arch/mips/mti-malta/malta-dtshim.c | 187 |
1 files changed, 181 insertions, 6 deletions
diff --git a/arch/mips/mti-malta/malta-dtshim.c b/arch/mips/mti-malta/malta-dtshim.c index 151f4882ec8a..c398582c316f 100644 --- a/arch/mips/mti-malta/malta-dtshim.c +++ b/arch/mips/mti-malta/malta-dtshim.c @@ -13,18 +13,66 @@ #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-cm.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; /* determined physical memory size, not overridden by command line args */ extern unsigned long physical_memsize; -#define MAX_MEM_ARRAY_ENTRIES 1 +enum mem_map { + MEM_MAP_V1 = 0, + MEM_MAP_V2, +}; + +#define MAX_MEM_ARRAY_ENTRIES 2 -static unsigned __init gen_fdt_mem_array(__be32 *mem_array, unsigned long size) +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; @@ -39,11 +87,47 @@ static unsigned __init gen_fdt_mem_array(__be32 *mem_array, unsigned long size) * 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 { - size_preio = min_t(unsigned long, size, SZ_256M); - mem_array[1] = cpu_to_be32(size_preio); + /* + * 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; } @@ -54,6 +138,8 @@ static void __init append_memory(void *fdt, int root_off) 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", }; @@ -106,6 +192,20 @@ static void __init append_memory(void *fdt, int root_off) /* 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) @@ -115,19 +215,93 @@ static void __init append_memory(void *fdt, int root_off) if (err) panic("Unable to set memory node device_type: %d", err); - mem_entries = gen_fdt_mem_array(mem_array, physical_memsize); + 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_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_GICEX_MSK)) + 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; @@ -153,6 +327,7 @@ void __init *malta_dt_shim(void *fdt) return fdt; append_memory(fdt_buf, root_off); + remove_gic(fdt_buf); err = fdt_pack(fdt_buf); if (err) |