1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * FSP-2 board specific routines 4 * 5 * Based on earlier code: 6 * Matt Porter <mporter@kernel.crashing.org> 7 * Copyright 2002-2005 MontaVista Software Inc. 8 * 9 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> 10 * Copyright (c) 2003-2005 Zultys Technologies 11 * 12 * Rewritten and ported to the merged powerpc tree: 13 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. 14 */ 15 16 #include <linux/init.h> 17 #include <linux/of_fdt.h> 18 #include <linux/of_platform.h> 19 #include <linux/rtc.h> 20 21 #include <asm/machdep.h> 22 #include <asm/udbg.h> 23 #include <asm/time.h> 24 #include <asm/uic.h> 25 #include <asm/ppc4xx.h> 26 #include <asm/dcr.h> 27 #include <linux/interrupt.h> 28 #include <linux/of_irq.h> 29 #include "fsp2.h" 30 31 #define FSP2_BUS_ERR "ibm,bus-error-irq" 32 #define FSP2_CMU_ERR "ibm,cmu-error-irq" 33 #define FSP2_CONF_ERR "ibm,conf-error-irq" 34 #define FSP2_OPBD_ERR "ibm,opbd-error-irq" 35 #define FSP2_MCUE "ibm,mc-ue-irq" 36 #define FSP2_RST_WRN "ibm,reset-warning-irq" 37 38 static __initdata struct of_device_id fsp2_of_bus[] = { 39 { .compatible = "ibm,plb4", }, 40 { .compatible = "ibm,plb6", }, 41 { .compatible = "ibm,opb", }, 42 {}, 43 }; 44 45 static void l2regs(void) 46 { 47 pr_err("L2 Controller:\n"); 48 pr_err("MCK: 0x%08x\n", mfl2(L2MCK)); 49 pr_err("INT: 0x%08x\n", mfl2(L2INT)); 50 pr_err("PLBSTAT0: 0x%08x\n", mfl2(L2PLBSTAT0)); 51 pr_err("PLBSTAT1: 0x%08x\n", mfl2(L2PLBSTAT1)); 52 pr_err("ARRSTAT0: 0x%08x\n", mfl2(L2ARRSTAT0)); 53 pr_err("ARRSTAT1: 0x%08x\n", mfl2(L2ARRSTAT1)); 54 pr_err("ARRSTAT2: 0x%08x\n", mfl2(L2ARRSTAT2)); 55 pr_err("CPUSTAT: 0x%08x\n", mfl2(L2CPUSTAT)); 56 pr_err("RACSTAT0: 0x%08x\n", mfl2(L2RACSTAT0)); 57 pr_err("WACSTAT0: 0x%08x\n", mfl2(L2WACSTAT0)); 58 pr_err("WACSTAT1: 0x%08x\n", mfl2(L2WACSTAT1)); 59 pr_err("WACSTAT2: 0x%08x\n", mfl2(L2WACSTAT2)); 60 pr_err("WDFSTAT: 0x%08x\n", mfl2(L2WDFSTAT)); 61 pr_err("LOG0: 0x%08x\n", mfl2(L2LOG0)); 62 pr_err("LOG1: 0x%08x\n", mfl2(L2LOG1)); 63 pr_err("LOG2: 0x%08x\n", mfl2(L2LOG2)); 64 pr_err("LOG3: 0x%08x\n", mfl2(L2LOG3)); 65 pr_err("LOG4: 0x%08x\n", mfl2(L2LOG4)); 66 pr_err("LOG5: 0x%08x\n", mfl2(L2LOG5)); 67 } 68 69 static void show_plbopb_regs(u32 base, int num) 70 { 71 pr_err("\nPLBOPB Bridge %d:\n", num); 72 pr_err("GESR0: 0x%08x\n", mfdcr(base + PLB4OPB_GESR0)); 73 pr_err("GESR1: 0x%08x\n", mfdcr(base + PLB4OPB_GESR1)); 74 pr_err("GESR2: 0x%08x\n", mfdcr(base + PLB4OPB_GESR2)); 75 pr_err("GEARU: 0x%08x\n", mfdcr(base + PLB4OPB_GEARU)); 76 pr_err("GEAR: 0x%08x\n", mfdcr(base + PLB4OPB_GEAR)); 77 } 78 79 static irqreturn_t bus_err_handler(int irq, void *data) 80 { 81 pr_err("Bus Error\n"); 82 83 l2regs(); 84 85 pr_err("\nPLB6 Controller:\n"); 86 pr_err("BC_SHD: 0x%08x\n", mfdcr(DCRN_PLB6_SHD)); 87 pr_err("BC_ERR: 0x%08x\n", mfdcr(DCRN_PLB6_ERR)); 88 89 pr_err("\nPLB6-to-PLB4 Bridge:\n"); 90 pr_err("ESR: 0x%08x\n", mfdcr(DCRN_PLB6PLB4_ESR)); 91 pr_err("EARH: 0x%08x\n", mfdcr(DCRN_PLB6PLB4_EARH)); 92 pr_err("EARL: 0x%08x\n", mfdcr(DCRN_PLB6PLB4_EARL)); 93 94 pr_err("\nPLB4-to-PLB6 Bridge:\n"); 95 pr_err("ESR: 0x%08x\n", mfdcr(DCRN_PLB4PLB6_ESR)); 96 pr_err("EARH: 0x%08x\n", mfdcr(DCRN_PLB4PLB6_EARH)); 97 pr_err("EARL: 0x%08x\n", mfdcr(DCRN_PLB4PLB6_EARL)); 98 99 pr_err("\nPLB6-to-MCIF Bridge:\n"); 100 pr_err("BESR0: 0x%08x\n", mfdcr(DCRN_PLB6MCIF_BESR0)); 101 pr_err("BESR1: 0x%08x\n", mfdcr(DCRN_PLB6MCIF_BESR1)); 102 pr_err("BEARH: 0x%08x\n", mfdcr(DCRN_PLB6MCIF_BEARH)); 103 pr_err("BEARL: 0x%08x\n", mfdcr(DCRN_PLB6MCIF_BEARL)); 104 105 pr_err("\nPLB4 Arbiter:\n"); 106 pr_err("P0ESRH 0x%08x\n", mfdcr(DCRN_PLB4_P0ESRH)); 107 pr_err("P0ESRL 0x%08x\n", mfdcr(DCRN_PLB4_P0ESRL)); 108 pr_err("P0EARH 0x%08x\n", mfdcr(DCRN_PLB4_P0EARH)); 109 pr_err("P0EARH 0x%08x\n", mfdcr(DCRN_PLB4_P0EARH)); 110 pr_err("P1ESRH 0x%08x\n", mfdcr(DCRN_PLB4_P1ESRH)); 111 pr_err("P1ESRL 0x%08x\n", mfdcr(DCRN_PLB4_P1ESRL)); 112 pr_err("P1EARH 0x%08x\n", mfdcr(DCRN_PLB4_P1EARH)); 113 pr_err("P1EARH 0x%08x\n", mfdcr(DCRN_PLB4_P1EARH)); 114 115 show_plbopb_regs(DCRN_PLB4OPB0_BASE, 0); 116 show_plbopb_regs(DCRN_PLB4OPB1_BASE, 1); 117 show_plbopb_regs(DCRN_PLB4OPB2_BASE, 2); 118 show_plbopb_regs(DCRN_PLB4OPB3_BASE, 3); 119 120 pr_err("\nPLB4-to-AHB Bridge:\n"); 121 pr_err("ESR: 0x%08x\n", mfdcr(DCRN_PLB4AHB_ESR)); 122 pr_err("SEUAR: 0x%08x\n", mfdcr(DCRN_PLB4AHB_SEUAR)); 123 pr_err("SELAR: 0x%08x\n", mfdcr(DCRN_PLB4AHB_SELAR)); 124 125 pr_err("\nAHB-to-PLB4 Bridge:\n"); 126 pr_err("\nESR: 0x%08x\n", mfdcr(DCRN_AHBPLB4_ESR)); 127 pr_err("\nEAR: 0x%08x\n", mfdcr(DCRN_AHBPLB4_EAR)); 128 panic("Bus Error\n"); 129 } 130 131 static irqreturn_t cmu_err_handler(int irq, void *data) { 132 pr_err("CMU Error\n"); 133 pr_err("FIR0: 0x%08x\n", mfcmu(CMUN_FIR0)); 134 panic("CMU Error\n"); 135 } 136 137 static irqreturn_t conf_err_handler(int irq, void *data) { 138 pr_err("Configuration Logic Error\n"); 139 pr_err("CONF_FIR: 0x%08x\n", mfdcr(DCRN_CONF_FIR_RWC)); 140 pr_err("RPERR0: 0x%08x\n", mfdcr(DCRN_CONF_RPERR0)); 141 pr_err("RPERR1: 0x%08x\n", mfdcr(DCRN_CONF_RPERR1)); 142 panic("Configuration Logic Error\n"); 143 } 144 145 static irqreturn_t opbd_err_handler(int irq, void *data) { 146 panic("OPBD Error\n"); 147 } 148 149 static irqreturn_t mcue_handler(int irq, void *data) { 150 pr_err("DDR: Uncorrectable Error\n"); 151 pr_err("MCSTAT: 0x%08x\n", 152 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_MCSTAT)); 153 pr_err("MCOPT1: 0x%08x\n", 154 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_MCOPT1)); 155 pr_err("MCOPT2: 0x%08x\n", 156 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_MCOPT2)); 157 pr_err("PHYSTAT: 0x%08x\n", 158 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_PHYSTAT)); 159 pr_err("CFGR0: 0x%08x\n", 160 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_CFGR0)); 161 pr_err("CFGR1: 0x%08x\n", 162 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_CFGR1)); 163 pr_err("CFGR2: 0x%08x\n", 164 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_CFGR2)); 165 pr_err("CFGR3: 0x%08x\n", 166 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_CFGR3)); 167 pr_err("SCRUB_CNTL: 0x%08x\n", 168 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_SCRUB_CNTL)); 169 pr_err("ECCERR_PORT0: 0x%08x\n", 170 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_ECCERR_PORT0)); 171 pr_err("ECCERR_ADDR_PORT0: 0x%08x\n", 172 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_ECCERR_ADDR_PORT0)); 173 pr_err("ECCERR_CNT_PORT0: 0x%08x\n", 174 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_ECCERR_COUNT_PORT0)); 175 pr_err("ECC_CHECK_PORT0: 0x%08x\n", 176 mfdcr(DCRN_DDR34_BASE + DCRN_DDR34_ECC_CHECK_PORT0)); 177 pr_err("MCER0: 0x%08x\n", 178 mfdcr(DCRN_CW_BASE + DCRN_CW_MCER0)); 179 pr_err("MCER1: 0x%08x\n", 180 mfdcr(DCRN_CW_BASE + DCRN_CW_MCER1)); 181 pr_err("BESR: 0x%08x\n", 182 mfdcr(DCRN_PLB6MCIF_BESR0)); 183 pr_err("BEARL: 0x%08x\n", 184 mfdcr(DCRN_PLB6MCIF_BEARL)); 185 pr_err("BEARH: 0x%08x\n", 186 mfdcr(DCRN_PLB6MCIF_BEARH)); 187 panic("DDR: Uncorrectable Error\n"); 188 } 189 190 static irqreturn_t rst_wrn_handler(int irq, void *data) { 191 u32 crcs = mfcmu(CMUN_CRCS); 192 switch (crcs & CRCS_STAT_MASK) { 193 case CRCS_STAT_CHIP_RST_B: 194 panic("Received chassis-initiated reset request"); 195 default: 196 panic("Unknown external reset: CRCS=0x%x", crcs); 197 } 198 } 199 200 static void __init node_irq_request(const char *compat, irq_handler_t errirq_handler) 201 { 202 unsigned int irq; 203 int32_t rc; 204 205 for_each_compatible_node_scoped(np, NULL, compat) { 206 irq = irq_of_parse_and_map(np, 0); 207 if (!irq) { 208 pr_err("device tree node %pOFn is missing a interrupt", 209 np); 210 return; 211 } 212 213 rc = request_irq(irq, errirq_handler, 0, np->name, np); 214 if (rc) { 215 pr_err("fsp_of_probe: request_irq failed: np=%pOF rc=%d", 216 np, rc); 217 return; 218 } 219 } 220 } 221 222 static void __init critical_irq_setup(void) 223 { 224 node_irq_request(FSP2_CMU_ERR, cmu_err_handler); 225 node_irq_request(FSP2_BUS_ERR, bus_err_handler); 226 node_irq_request(FSP2_CONF_ERR, conf_err_handler); 227 node_irq_request(FSP2_OPBD_ERR, opbd_err_handler); 228 node_irq_request(FSP2_MCUE, mcue_handler); 229 node_irq_request(FSP2_RST_WRN, rst_wrn_handler); 230 } 231 232 static int __init fsp2_device_probe(void) 233 { 234 of_platform_bus_probe(NULL, fsp2_of_bus, NULL); 235 return 0; 236 } 237 machine_device_initcall(fsp2, fsp2_device_probe); 238 239 static int __init fsp2_probe(void) 240 { 241 u32 val; 242 unsigned long root = of_get_flat_dt_root(); 243 244 if (!of_flat_dt_is_compatible(root, "ibm,fsp2")) 245 return 0; 246 247 /* Clear BC_ERR and mask snoopable request plb errors. */ 248 val = mfdcr(DCRN_PLB6_CR0); 249 val |= 0x20000000; 250 mtdcr(DCRN_PLB6_BASE, val); 251 mtdcr(DCRN_PLB6_HD, 0xffff0000); 252 mtdcr(DCRN_PLB6_SHD, 0xffff0000); 253 254 /* TVSENSE reset is blocked (clock gated) by the POR default of the TVS 255 * sleep config bit. As a consequence, TVSENSE will provide erratic 256 * sensor values, which may result in spurious (parity) errors 257 * recorded in the CMU FIR and leading to erroneous interrupt requests 258 * once the CMU interrupt is unmasked. 259 */ 260 261 /* 1. set TVS1[UNDOZE] */ 262 val = mfcmu(CMUN_TVS1); 263 val |= 0x4; 264 mtcmu(CMUN_TVS1, val); 265 266 /* 2. clear FIR[TVS] and FIR[TVSPAR] */ 267 val = mfcmu(CMUN_FIR0); 268 val |= 0x30000000; 269 mtcmu(CMUN_FIR0, val); 270 271 /* L2 machine checks */ 272 mtl2(L2PLBMCKEN0, 0xffffffff); 273 mtl2(L2PLBMCKEN1, 0x0000ffff); 274 mtl2(L2ARRMCKEN0, 0xffffffff); 275 mtl2(L2ARRMCKEN1, 0xffffffff); 276 mtl2(L2ARRMCKEN2, 0xfffff000); 277 mtl2(L2CPUMCKEN, 0xffffffff); 278 mtl2(L2RACMCKEN0, 0xffffffff); 279 mtl2(L2WACMCKEN0, 0xffffffff); 280 mtl2(L2WACMCKEN1, 0xffffffff); 281 mtl2(L2WACMCKEN2, 0xffffffff); 282 mtl2(L2WDFMCKEN, 0xffffffff); 283 284 /* L2 interrupts */ 285 mtl2(L2PLBINTEN1, 0xffff0000); 286 287 /* 288 * At a global level, enable all L2 machine checks and interrupts 289 * reported by the L2 subsystems, except for the external machine check 290 * input (UIC0.1). 291 */ 292 mtl2(L2MCKEN, 0x000007ff); 293 mtl2(L2INTEN, 0x000004ff); 294 295 /* Enable FSP-2 configuration logic parity errors */ 296 mtdcr(DCRN_CONF_EIR_RS, 0x80000000); 297 return 1; 298 } 299 300 static void __init fsp2_irq_init(void) 301 { 302 uic_init_tree(); 303 critical_irq_setup(); 304 } 305 306 define_machine(fsp2) { 307 .name = "FSP-2", 308 .probe = fsp2_probe, 309 .progress = udbg_progress, 310 .init_IRQ = fsp2_irq_init, 311 .get_irq = uic_get_irq, 312 .restart = ppc4xx_reset_system, 313 }; 314