1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * PowerPC 476FPE board specific routines 4 * 5 * Copyright © 2013 Tony Breeds IBM Corporation 6 * Copyright © 2013 Alistair Popple IBM Corporation 7 * 8 * Based on earlier code: 9 * Matt Porter <mporter@kernel.crashing.org> 10 * Copyright 2002-2005 MontaVista Software Inc. 11 * 12 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> 13 * Copyright (c) 2003-2005 Zultys Technologies 14 * 15 * Rewritten and ported to the merged powerpc tree: 16 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. 17 * Copyright © 2011 David Kliekamp IBM Corporation 18 */ 19 20 #include <linux/init.h> 21 #include <linux/of.h> 22 #include <linux/of_platform.h> 23 #include <linux/rtc.h> 24 25 #include <asm/machdep.h> 26 #include <asm/prom.h> 27 #include <asm/udbg.h> 28 #include <asm/time.h> 29 #include <asm/uic.h> 30 #include <asm/ppc4xx.h> 31 #include <asm/mpic.h> 32 #include <asm/mmu.h> 33 #include <asm/swiotlb.h> 34 35 #include <linux/pci.h> 36 #include <linux/i2c.h> 37 38 static const struct of_device_id ppc47x_of_bus[] __initconst = { 39 { .compatible = "ibm,plb4", }, 40 { .compatible = "ibm,plb6", }, 41 { .compatible = "ibm,opb", }, 42 { .compatible = "ibm,ebc", }, 43 {}, 44 }; 45 46 /* The EEPROM is missing and the default values are bogus. This forces USB in 47 * to EHCI mode */ 48 static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev) 49 { 50 if (of_machine_is_compatible("ibm,currituck")) { 51 pci_write_config_dword(dev, 0xe0, 0x0114231f); 52 pci_write_config_dword(dev, 0xe4, 0x00006c40); 53 } 54 } 55 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup); 56 57 /* Akebono has an AVR microcontroller attached to the I2C bus 58 * which is used to power off/reset the system. */ 59 60 /* AVR I2C Commands */ 61 #define AVR_PWRCTL_CMD (0x26) 62 63 /* Flags for the power control I2C commands */ 64 #define AVR_PWRCTL_PWROFF (0x01) 65 #define AVR_PWRCTL_RESET (0x02) 66 67 static struct i2c_client *avr_i2c_client; 68 static void __noreturn avr_halt_system(int pwrctl_flags) 69 { 70 /* Request the AVR to reset the system */ 71 i2c_smbus_write_byte_data(avr_i2c_client, 72 AVR_PWRCTL_CMD, pwrctl_flags); 73 74 /* Wait for system to be reset */ 75 while (1) 76 ; 77 } 78 79 static void avr_power_off_system(void) 80 { 81 avr_halt_system(AVR_PWRCTL_PWROFF); 82 } 83 84 static void __noreturn avr_reset_system(char *cmd) 85 { 86 avr_halt_system(AVR_PWRCTL_RESET); 87 } 88 89 static int avr_probe(struct i2c_client *client) 90 { 91 avr_i2c_client = client; 92 ppc_md.restart = avr_reset_system; 93 pm_power_off = avr_power_off_system; 94 return 0; 95 } 96 97 static const struct i2c_device_id avr_id[] = { 98 { "akebono-avr", 0 }, 99 { } 100 }; 101 102 static struct i2c_driver avr_driver = { 103 .driver = { 104 .name = "akebono-avr", 105 }, 106 .probe_new = avr_probe, 107 .id_table = avr_id, 108 }; 109 110 static int __init ppc47x_device_probe(void) 111 { 112 i2c_add_driver(&avr_driver); 113 of_platform_bus_probe(NULL, ppc47x_of_bus, NULL); 114 115 return 0; 116 } 117 machine_device_initcall(ppc47x, ppc47x_device_probe); 118 119 static void __init ppc47x_init_irq(void) 120 { 121 struct device_node *np; 122 123 /* Find top level interrupt controller */ 124 for_each_node_with_property(np, "interrupt-controller") { 125 if (of_get_property(np, "interrupts", NULL) == NULL) 126 break; 127 } 128 if (np == NULL) 129 panic("Can't find top level interrupt controller"); 130 131 /* Check type and do appropriate initialization */ 132 if (of_device_is_compatible(np, "chrp,open-pic")) { 133 /* The MPIC driver will get everything it needs from the 134 * device-tree, just pass 0 to all arguments 135 */ 136 struct mpic *mpic = 137 mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC "); 138 BUG_ON(mpic == NULL); 139 mpic_init(mpic); 140 ppc_md.get_irq = mpic_get_irq; 141 } else 142 panic("Unrecognized top level interrupt controller"); 143 } 144 145 #ifdef CONFIG_SMP 146 static void smp_ppc47x_setup_cpu(int cpu) 147 { 148 mpic_setup_this_cpu(); 149 } 150 151 static int smp_ppc47x_kick_cpu(int cpu) 152 { 153 struct device_node *cpunode = of_get_cpu_node(cpu, NULL); 154 const u64 *spin_table_addr_prop; 155 u32 *spin_table; 156 extern void start_secondary_47x(void); 157 158 BUG_ON(cpunode == NULL); 159 160 /* Assume spin table. We could test for the enable-method in 161 * the device-tree but currently there's little point as it's 162 * our only supported method 163 */ 164 spin_table_addr_prop = 165 of_get_property(cpunode, "cpu-release-addr", NULL); 166 167 if (spin_table_addr_prop == NULL) { 168 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", 169 cpu); 170 return 1; 171 } 172 173 /* Assume it's mapped as part of the linear mapping. This is a bit 174 * fishy but will work fine for now 175 * 176 * XXX: Is there any reason to assume differently? 177 */ 178 spin_table = (u32 *)__va(*spin_table_addr_prop); 179 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); 180 181 spin_table[3] = cpu; 182 smp_wmb(); 183 spin_table[1] = __pa(start_secondary_47x); 184 mb(); 185 186 return 0; 187 } 188 189 static struct smp_ops_t ppc47x_smp_ops = { 190 .probe = smp_mpic_probe, 191 .message_pass = smp_mpic_message_pass, 192 .setup_cpu = smp_ppc47x_setup_cpu, 193 .kick_cpu = smp_ppc47x_kick_cpu, 194 .give_timebase = smp_generic_give_timebase, 195 .take_timebase = smp_generic_take_timebase, 196 }; 197 198 static void __init ppc47x_smp_init(void) 199 { 200 if (mmu_has_feature(MMU_FTR_TYPE_47x)) 201 smp_ops = &ppc47x_smp_ops; 202 } 203 204 #else /* CONFIG_SMP */ 205 static void __init ppc47x_smp_init(void) { } 206 #endif /* CONFIG_SMP */ 207 208 static void __init ppc47x_setup_arch(void) 209 { 210 211 /* No need to check the DMA config as we /know/ our windows are all of 212 * RAM. Lets hope that doesn't change */ 213 swiotlb_detect_4g(); 214 215 ppc47x_smp_init(); 216 } 217 218 static int board_rev = -1; 219 static int __init ppc47x_get_board_rev(void) 220 { 221 int reg; 222 u8 __iomem *fpga; 223 struct device_node *np = NULL; 224 225 if (of_machine_is_compatible("ibm,currituck")) { 226 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga"); 227 reg = 0; 228 } else if (of_machine_is_compatible("ibm,akebono")) { 229 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga"); 230 reg = 2; 231 } 232 233 if (!np) 234 goto fail; 235 236 fpga = of_iomap(np, 0); 237 of_node_put(np); 238 if (!fpga) 239 goto fail; 240 241 board_rev = ioread8(fpga + reg) & 0x03; 242 pr_info("%s: Found board revision %d\n", __func__, board_rev); 243 iounmap(fpga); 244 return 0; 245 246 fail: 247 pr_info("%s: Unable to find board revision\n", __func__); 248 return 0; 249 } 250 machine_arch_initcall(ppc47x, ppc47x_get_board_rev); 251 252 /* Use USB controller should have been hardware swizzled but it wasn't :( */ 253 static void ppc47x_pci_irq_fixup(struct pci_dev *dev) 254 { 255 if (dev->vendor == 0x1033 && (dev->device == 0x0035 || 256 dev->device == 0x00e0)) { 257 if (board_rev == 0) { 258 dev->irq = irq_create_mapping(NULL, 47); 259 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 260 } else if (board_rev == 2) { 261 dev->irq = irq_create_mapping(NULL, 49); 262 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 263 } else { 264 pr_alert("%s: Unknown board revision\n", __func__); 265 } 266 } 267 } 268 269 /* 270 * Called very early, MMU is off, device-tree isn't unflattened 271 */ 272 static int __init ppc47x_probe(void) 273 { 274 if (of_machine_is_compatible("ibm,akebono")) 275 return 1; 276 277 if (of_machine_is_compatible("ibm,currituck")) { 278 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup; 279 return 1; 280 } 281 282 return 0; 283 } 284 285 define_machine(ppc47x) { 286 .name = "PowerPC 47x", 287 .probe = ppc47x_probe, 288 .progress = udbg_progress, 289 .init_IRQ = ppc47x_init_irq, 290 .setup_arch = ppc47x_setup_arch, 291 .restart = ppc4xx_reset_system, 292 .calibrate_decr = generic_calibrate_decr, 293 }; 294