1 /* 2 * PowerPC 476FPE board specific routines 3 * 4 * Copyright © 2013 Tony Breeds IBM Corporation 5 * Copyright © 2013 Alistair Popple IBM Corporation 6 * 7 * Based on earlier code: 8 * Matt Porter <mporter@kernel.crashing.org> 9 * Copyright 2002-2005 MontaVista Software Inc. 10 * 11 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> 12 * Copyright (c) 2003-2005 Zultys Technologies 13 * 14 * Rewritten and ported to the merged powerpc tree: 15 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. 16 * Copyright © 2011 David Kliekamp IBM Corporation 17 * 18 * This program is free software; you can redistribute it and/or modify it 19 * under the terms of the GNU General Public License as published by the 20 * Free Software Foundation; either version 2 of the License, or (at your 21 * option) any later version. 22 */ 23 24 #include <linux/init.h> 25 #include <linux/of.h> 26 #include <linux/of_platform.h> 27 #include <linux/rtc.h> 28 29 #include <asm/machdep.h> 30 #include <asm/prom.h> 31 #include <asm/udbg.h> 32 #include <asm/time.h> 33 #include <asm/uic.h> 34 #include <asm/ppc4xx.h> 35 #include <asm/mpic.h> 36 #include <asm/mmu.h> 37 #include <asm/swiotlb.h> 38 39 #include <linux/pci.h> 40 #include <linux/i2c.h> 41 42 static const struct of_device_id ppc47x_of_bus[] __initconst = { 43 { .compatible = "ibm,plb4", }, 44 { .compatible = "ibm,plb6", }, 45 { .compatible = "ibm,opb", }, 46 { .compatible = "ibm,ebc", }, 47 {}, 48 }; 49 50 /* The EEPROM is missing and the default values are bogus. This forces USB in 51 * to EHCI mode */ 52 static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev) 53 { 54 if (of_machine_is_compatible("ibm,currituck")) { 55 pci_write_config_dword(dev, 0xe0, 0x0114231f); 56 pci_write_config_dword(dev, 0xe4, 0x00006c40); 57 } 58 } 59 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup); 60 61 /* Akebono has an AVR microcontroller attached to the I2C bus 62 * which is used to power off/reset the system. */ 63 64 /* AVR I2C Commands */ 65 #define AVR_PWRCTL_CMD (0x26) 66 67 /* Flags for the power control I2C commands */ 68 #define AVR_PWRCTL_PWROFF (0x01) 69 #define AVR_PWRCTL_RESET (0x02) 70 71 static struct i2c_client *avr_i2c_client; 72 static void __noreturn avr_halt_system(int pwrctl_flags) 73 { 74 /* Request the AVR to reset the system */ 75 i2c_smbus_write_byte_data(avr_i2c_client, 76 AVR_PWRCTL_CMD, pwrctl_flags); 77 78 /* Wait for system to be reset */ 79 while (1) 80 ; 81 } 82 83 static void avr_power_off_system(void) 84 { 85 avr_halt_system(AVR_PWRCTL_PWROFF); 86 } 87 88 static void __noreturn avr_reset_system(char *cmd) 89 { 90 avr_halt_system(AVR_PWRCTL_RESET); 91 } 92 93 static int avr_probe(struct i2c_client *client, 94 const struct i2c_device_id *id) 95 { 96 avr_i2c_client = client; 97 ppc_md.restart = avr_reset_system; 98 pm_power_off = avr_power_off_system; 99 return 0; 100 } 101 102 static const struct i2c_device_id avr_id[] = { 103 { "akebono-avr", 0 }, 104 { } 105 }; 106 107 static struct i2c_driver avr_driver = { 108 .driver = { 109 .name = "akebono-avr", 110 }, 111 .probe = avr_probe, 112 .id_table = avr_id, 113 }; 114 115 static int __init ppc47x_device_probe(void) 116 { 117 i2c_add_driver(&avr_driver); 118 of_platform_bus_probe(NULL, ppc47x_of_bus, NULL); 119 120 return 0; 121 } 122 machine_device_initcall(ppc47x, ppc47x_device_probe); 123 124 static void __init ppc47x_init_irq(void) 125 { 126 struct device_node *np; 127 128 /* Find top level interrupt controller */ 129 for_each_node_with_property(np, "interrupt-controller") { 130 if (of_get_property(np, "interrupts", NULL) == NULL) 131 break; 132 } 133 if (np == NULL) 134 panic("Can't find top level interrupt controller"); 135 136 /* Check type and do appropriate initialization */ 137 if (of_device_is_compatible(np, "chrp,open-pic")) { 138 /* The MPIC driver will get everything it needs from the 139 * device-tree, just pass 0 to all arguments 140 */ 141 struct mpic *mpic = 142 mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC "); 143 BUG_ON(mpic == NULL); 144 mpic_init(mpic); 145 ppc_md.get_irq = mpic_get_irq; 146 } else 147 panic("Unrecognized top level interrupt controller"); 148 } 149 150 #ifdef CONFIG_SMP 151 static void smp_ppc47x_setup_cpu(int cpu) 152 { 153 mpic_setup_this_cpu(); 154 } 155 156 static int smp_ppc47x_kick_cpu(int cpu) 157 { 158 struct device_node *cpunode = of_get_cpu_node(cpu, NULL); 159 const u64 *spin_table_addr_prop; 160 u32 *spin_table; 161 extern void start_secondary_47x(void); 162 163 BUG_ON(cpunode == NULL); 164 165 /* Assume spin table. We could test for the enable-method in 166 * the device-tree but currently there's little point as it's 167 * our only supported method 168 */ 169 spin_table_addr_prop = 170 of_get_property(cpunode, "cpu-release-addr", NULL); 171 172 if (spin_table_addr_prop == NULL) { 173 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", 174 cpu); 175 return 1; 176 } 177 178 /* Assume it's mapped as part of the linear mapping. This is a bit 179 * fishy but will work fine for now 180 * 181 * XXX: Is there any reason to assume differently? 182 */ 183 spin_table = (u32 *)__va(*spin_table_addr_prop); 184 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); 185 186 spin_table[3] = cpu; 187 smp_wmb(); 188 spin_table[1] = __pa(start_secondary_47x); 189 mb(); 190 191 return 0; 192 } 193 194 static struct smp_ops_t ppc47x_smp_ops = { 195 .probe = smp_mpic_probe, 196 .message_pass = smp_mpic_message_pass, 197 .setup_cpu = smp_ppc47x_setup_cpu, 198 .kick_cpu = smp_ppc47x_kick_cpu, 199 .give_timebase = smp_generic_give_timebase, 200 .take_timebase = smp_generic_take_timebase, 201 }; 202 203 static void __init ppc47x_smp_init(void) 204 { 205 if (mmu_has_feature(MMU_FTR_TYPE_47x)) 206 smp_ops = &ppc47x_smp_ops; 207 } 208 209 #else /* CONFIG_SMP */ 210 static void __init ppc47x_smp_init(void) { } 211 #endif /* CONFIG_SMP */ 212 213 static void __init ppc47x_setup_arch(void) 214 { 215 216 /* No need to check the DMA config as we /know/ our windows are all of 217 * RAM. Lets hope that doesn't change */ 218 swiotlb_detect_4g(); 219 220 ppc47x_smp_init(); 221 } 222 223 static int board_rev = -1; 224 static int __init ppc47x_get_board_rev(void) 225 { 226 int reg; 227 u8 *fpga; 228 struct device_node *np = NULL; 229 230 if (of_machine_is_compatible("ibm,currituck")) { 231 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga"); 232 reg = 0; 233 } else if (of_machine_is_compatible("ibm,akebono")) { 234 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga"); 235 reg = 2; 236 } 237 238 if (!np) 239 goto fail; 240 241 fpga = (u8 *) of_iomap(np, 0); 242 of_node_put(np); 243 if (!fpga) 244 goto fail; 245 246 board_rev = ioread8(fpga + reg) & 0x03; 247 pr_info("%s: Found board revision %d\n", __func__, board_rev); 248 iounmap(fpga); 249 return 0; 250 251 fail: 252 pr_info("%s: Unable to find board revision\n", __func__); 253 return 0; 254 } 255 machine_arch_initcall(ppc47x, ppc47x_get_board_rev); 256 257 /* Use USB controller should have been hardware swizzled but it wasn't :( */ 258 static void ppc47x_pci_irq_fixup(struct pci_dev *dev) 259 { 260 if (dev->vendor == 0x1033 && (dev->device == 0x0035 || 261 dev->device == 0x00e0)) { 262 if (board_rev == 0) { 263 dev->irq = irq_create_mapping(NULL, 47); 264 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 265 } else if (board_rev == 2) { 266 dev->irq = irq_create_mapping(NULL, 49); 267 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 268 } else { 269 pr_alert("%s: Unknown board revision\n", __func__); 270 } 271 } 272 } 273 274 /* 275 * Called very early, MMU is off, device-tree isn't unflattened 276 */ 277 static int __init ppc47x_probe(void) 278 { 279 if (of_machine_is_compatible("ibm,akebono")) 280 return 1; 281 282 if (of_machine_is_compatible("ibm,currituck")) { 283 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup; 284 return 1; 285 } 286 287 return 0; 288 } 289 290 define_machine(ppc47x) { 291 .name = "PowerPC 47x", 292 .probe = ppc47x_probe, 293 .progress = udbg_progress, 294 .init_IRQ = ppc47x_init_irq, 295 .setup_arch = ppc47x_setup_arch, 296 .restart = ppc4xx_reset_system, 297 .calibrate_decr = generic_calibrate_decr, 298 }; 299