1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Copyright (C) 2015 Nikolay Martynov <mar.kolya@gmail.com> 5 * Copyright (C) 2015 John Crispin <john@phrozen.org> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/slab.h> 11 #include <linux/sys_soc.h> 12 #include <linux/memblock.h> 13 #include <linux/pci.h> 14 #include <linux/bug.h> 15 16 #include <asm/bootinfo.h> 17 #include <asm/mipsregs.h> 18 #include <asm/smp-ops.h> 19 #include <asm/mips-cps.h> 20 #include <asm/mach-ralink/ralink_regs.h> 21 #include <asm/mach-ralink/mt7621.h> 22 23 #include "common.h" 24 25 #define MT7621_MEM_TEST_PATTERN 0xaa5555aa 26 27 static u32 detect_magic __initdata; 28 29 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) 30 { 31 struct resource_entry *entry; 32 resource_size_t mask; 33 34 entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM); 35 if (!entry) { 36 pr_err("Cannot get memory resource\n"); 37 return -EINVAL; 38 } 39 40 if (mips_cps_numiocu(0)) { 41 /* 42 * Hardware doesn't accept mask values with 1s after 43 * 0s (e.g. 0xffef), so warn if that's happen 44 */ 45 mask = ~(entry->res->end - entry->res->start) & CM_GCR_REGn_MASK_ADDRMASK; 46 WARN_ON(mask && BIT(ffz(~mask)) - 1 != ~mask); 47 48 write_gcr_reg1_base(entry->res->start); 49 write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0); 50 pr_info("PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n", 51 (unsigned long long)read_gcr_reg1_base(), 52 (unsigned long long)read_gcr_reg1_mask()); 53 } 54 55 return 0; 56 } 57 58 phys_addr_t mips_cpc_default_phys_base(void) 59 { 60 panic("Cannot detect cpc address"); 61 } 62 63 static bool __init mt7621_addr_wraparound_test(phys_addr_t size) 64 { 65 void *dm = (void *)KSEG1ADDR(&detect_magic); 66 67 if (CPHYSADDR(dm + size) >= MT7621_LOWMEM_MAX_SIZE) 68 return true; 69 __raw_writel(MT7621_MEM_TEST_PATTERN, dm); 70 if (__raw_readl(dm) != __raw_readl(dm + size)) 71 return false; 72 __raw_writel(~MT7621_MEM_TEST_PATTERN, dm); 73 return __raw_readl(dm) == __raw_readl(dm + size); 74 } 75 76 static void __init mt7621_memory_detect(void) 77 { 78 phys_addr_t size; 79 80 for (size = 32 * SZ_1M; size <= 256 * SZ_1M; size <<= 1) { 81 if (mt7621_addr_wraparound_test(size)) { 82 memblock_add(MT7621_LOWMEM_BASE, size); 83 return; 84 } 85 } 86 87 memblock_add(MT7621_LOWMEM_BASE, MT7621_LOWMEM_MAX_SIZE); 88 memblock_add(MT7621_HIGHMEM_BASE, MT7621_HIGHMEM_SIZE); 89 } 90 91 void __init ralink_of_remap(void) 92 { 93 rt_sysc_membase = plat_of_remap_node("mediatek,mt7621-sysc"); 94 rt_memc_membase = plat_of_remap_node("mediatek,mt7621-memc"); 95 96 if (!rt_sysc_membase || !rt_memc_membase) 97 panic("Failed to remap core resources"); 98 } 99 100 static void soc_dev_init(struct ralink_soc_info *soc_info, u32 rev) 101 { 102 struct soc_device *soc_dev; 103 struct soc_device_attribute *soc_dev_attr; 104 105 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); 106 if (!soc_dev_attr) 107 return; 108 109 soc_dev_attr->soc_id = "mt7621"; 110 soc_dev_attr->family = "Ralink"; 111 112 if (((rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK) == 1 && 113 (rev & CHIP_REV_ECO_MASK) == 1) 114 soc_dev_attr->revision = "E2"; 115 else 116 soc_dev_attr->revision = "E1"; 117 118 soc_dev_attr->data = soc_info; 119 120 soc_dev = soc_device_register(soc_dev_attr); 121 if (IS_ERR(soc_dev)) { 122 kfree(soc_dev_attr); 123 return; 124 } 125 } 126 127 void __init prom_soc_init(struct ralink_soc_info *soc_info) 128 { 129 void __iomem *sysc = (void __iomem *) KSEG1ADDR(MT7621_SYSC_BASE); 130 unsigned char *name = NULL; 131 u32 n0; 132 u32 n1; 133 u32 rev; 134 135 /* Early detection of CMP support */ 136 mips_cm_probe(); 137 mips_cpc_probe(); 138 139 if (mips_cps_numiocu(0)) { 140 /* 141 * mips_cm_probe() wipes out bootloader 142 * config for CM regions and we have to configure them 143 * again. This SoC cannot talk to pamlbus devices 144 * witout proper iocu region set up. 145 * 146 * FIXME: it would be better to do this with values 147 * from DT, but we need this very early because 148 * without this we cannot talk to pretty much anything 149 * including serial. 150 */ 151 write_gcr_reg0_base(MT7621_PALMBUS_BASE); 152 write_gcr_reg0_mask(~MT7621_PALMBUS_SIZE | 153 CM_GCR_REGn_MASK_CMTGT_IOCU0); 154 __sync(); 155 } 156 157 n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0); 158 n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1); 159 160 if (n0 == MT7621_CHIP_NAME0 && n1 == MT7621_CHIP_NAME1) { 161 name = "MT7621"; 162 soc_info->compatible = "mediatek,mt7621-soc"; 163 } else { 164 panic("mt7621: unknown SoC, n0:%08x n1:%08x\n", n0, n1); 165 } 166 ralink_soc = MT762X_SOC_MT7621AT; 167 rev = __raw_readl(sysc + SYSC_REG_CHIP_REV); 168 169 snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN, 170 "MediaTek %s ver:%u eco:%u", 171 name, 172 (rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK, 173 (rev & CHIP_REV_ECO_MASK)); 174 175 soc_info->mem_detect = mt7621_memory_detect; 176 177 soc_dev_init(soc_info, rev); 178 179 if (!register_cps_smp_ops()) 180 return; 181 if (!register_cmp_smp_ops()) 182 return; 183 if (!register_vsmp_smp_ops()) 184 return; 185 } 186