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_address.h> 23 #include <linux/of_platform.h> 24 #include <linux/rtc.h> 25 26 #include <asm/machdep.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 of_node_put(np); 145 } 146 147 #ifdef CONFIG_SMP 148 static void smp_ppc47x_setup_cpu(int cpu) 149 { 150 mpic_setup_this_cpu(); 151 } 152 153 static int smp_ppc47x_kick_cpu(int cpu) 154 { 155 struct device_node *cpunode = of_get_cpu_node(cpu, NULL); 156 const u64 *spin_table_addr_prop; 157 u32 *spin_table; 158 extern void start_secondary_47x(void); 159 160 BUG_ON(cpunode == NULL); 161 162 /* Assume spin table. We could test for the enable-method in 163 * the device-tree but currently there's little point as it's 164 * our only supported method 165 */ 166 spin_table_addr_prop = 167 of_get_property(cpunode, "cpu-release-addr", NULL); 168 169 if (spin_table_addr_prop == NULL) { 170 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", 171 cpu); 172 return 1; 173 } 174 175 /* Assume it's mapped as part of the linear mapping. This is a bit 176 * fishy but will work fine for now 177 * 178 * XXX: Is there any reason to assume differently? 179 */ 180 spin_table = (u32 *)__va(*spin_table_addr_prop); 181 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); 182 183 spin_table[3] = cpu; 184 smp_wmb(); 185 spin_table[1] = __pa(start_secondary_47x); 186 mb(); 187 188 return 0; 189 } 190 191 static struct smp_ops_t ppc47x_smp_ops = { 192 .probe = smp_mpic_probe, 193 .message_pass = smp_mpic_message_pass, 194 .setup_cpu = smp_ppc47x_setup_cpu, 195 .kick_cpu = smp_ppc47x_kick_cpu, 196 .give_timebase = smp_generic_give_timebase, 197 .take_timebase = smp_generic_take_timebase, 198 }; 199 200 static void __init ppc47x_smp_init(void) 201 { 202 if (mmu_has_feature(MMU_FTR_TYPE_47x)) 203 smp_ops = &ppc47x_smp_ops; 204 } 205 206 #else /* CONFIG_SMP */ 207 static void __init ppc47x_smp_init(void) { } 208 #endif /* CONFIG_SMP */ 209 210 static void __init ppc47x_setup_arch(void) 211 { 212 213 /* No need to check the DMA config as we /know/ our windows are all of 214 * RAM. Lets hope that doesn't change */ 215 swiotlb_detect_4g(); 216 217 ppc47x_smp_init(); 218 } 219 220 static int board_rev = -1; 221 static int __init ppc47x_get_board_rev(void) 222 { 223 int reg; 224 u8 __iomem *fpga; 225 struct device_node *np = NULL; 226 227 if (of_machine_is_compatible("ibm,currituck")) { 228 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga"); 229 reg = 0; 230 } else if (of_machine_is_compatible("ibm,akebono")) { 231 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga"); 232 reg = 2; 233 } 234 235 if (!np) 236 goto fail; 237 238 fpga = of_iomap(np, 0); 239 of_node_put(np); 240 if (!fpga) 241 goto fail; 242 243 board_rev = ioread8(fpga + reg) & 0x03; 244 pr_info("%s: Found board revision %d\n", __func__, board_rev); 245 iounmap(fpga); 246 return 0; 247 248 fail: 249 pr_info("%s: Unable to find board revision\n", __func__); 250 return 0; 251 } 252 machine_arch_initcall(ppc47x, ppc47x_get_board_rev); 253 254 /* Use USB controller should have been hardware swizzled but it wasn't :( */ 255 static void ppc47x_pci_irq_fixup(struct pci_dev *dev) 256 { 257 if (dev->vendor == 0x1033 && (dev->device == 0x0035 || 258 dev->device == 0x00e0)) { 259 if (board_rev == 0) { 260 dev->irq = irq_create_mapping(NULL, 47); 261 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 262 } else if (board_rev == 2) { 263 dev->irq = irq_create_mapping(NULL, 49); 264 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 265 } else { 266 pr_alert("%s: Unknown board revision\n", __func__); 267 } 268 } 269 } 270 271 /* 272 * Called very early, MMU is off, device-tree isn't unflattened 273 */ 274 static int __init ppc47x_probe(void) 275 { 276 if (of_machine_is_compatible("ibm,akebono")) 277 return 1; 278 279 if (of_machine_is_compatible("ibm,currituck")) { 280 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup; 281 return 1; 282 } 283 284 return 0; 285 } 286 287 define_machine(ppc47x) { 288 .name = "PowerPC 47x", 289 .probe = ppc47x_probe, 290 .progress = udbg_progress, 291 .init_IRQ = ppc47x_init_irq, 292 .setup_arch = ppc47x_setup_arch, 293 .restart = ppc4xx_reset_system, 294 .calibrate_decr = generic_calibrate_decr, 295 }; 296