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 = 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_akebono, ppc47x_device_probe); 118 machine_device_initcall(ppc47x_currituck, ppc47x_device_probe); 119 120 static void __init ppc47x_init_irq(void) 121 { 122 struct device_node *np; 123 124 /* Find top level interrupt controller */ 125 for_each_node_with_property(np, "interrupt-controller") { 126 if (!of_property_present(np, "interrupts")) 127 break; 128 } 129 if (np == NULL) 130 panic("Can't find top level interrupt controller"); 131 132 /* Check type and do appropriate initialization */ 133 if (of_device_is_compatible(np, "chrp,open-pic")) { 134 /* The MPIC driver will get everything it needs from the 135 * device-tree, just pass 0 to all arguments 136 */ 137 struct mpic *mpic = 138 mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC "); 139 BUG_ON(mpic == NULL); 140 mpic_init(mpic); 141 ppc_md.get_irq = mpic_get_irq; 142 } else 143 panic("Unrecognized top level interrupt controller"); 144 145 of_node_put(np); 146 } 147 148 #ifdef CONFIG_SMP 149 static void smp_ppc47x_setup_cpu(int cpu) 150 { 151 mpic_setup_this_cpu(); 152 } 153 154 static int smp_ppc47x_kick_cpu(int cpu) 155 { 156 struct device_node *cpunode = of_get_cpu_node(cpu, NULL); 157 const u64 *spin_table_addr_prop; 158 u32 *spin_table; 159 extern void start_secondary_47x(void); 160 161 BUG_ON(cpunode == NULL); 162 163 /* Assume spin table. We could test for the enable-method in 164 * the device-tree but currently there's little point as it's 165 * our only supported method 166 */ 167 spin_table_addr_prop = 168 of_get_property(cpunode, "cpu-release-addr", NULL); 169 170 if (spin_table_addr_prop == NULL) { 171 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", 172 cpu); 173 return 1; 174 } 175 176 /* Assume it's mapped as part of the linear mapping. This is a bit 177 * fishy but will work fine for now 178 * 179 * XXX: Is there any reason to assume differently? 180 */ 181 spin_table = (u32 *)__va(*spin_table_addr_prop); 182 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); 183 184 spin_table[3] = cpu; 185 smp_wmb(); 186 spin_table[1] = __pa(start_secondary_47x); 187 mb(); 188 189 return 0; 190 } 191 192 static struct smp_ops_t ppc47x_smp_ops = { 193 .probe = smp_mpic_probe, 194 .message_pass = smp_mpic_message_pass, 195 .setup_cpu = smp_ppc47x_setup_cpu, 196 .kick_cpu = smp_ppc47x_kick_cpu, 197 .give_timebase = smp_generic_give_timebase, 198 .take_timebase = smp_generic_take_timebase, 199 }; 200 201 static void __init ppc47x_smp_init(void) 202 { 203 if (mmu_has_feature(MMU_FTR_TYPE_47x)) 204 smp_ops = &ppc47x_smp_ops; 205 } 206 207 #else /* CONFIG_SMP */ 208 static void __init ppc47x_smp_init(void) { } 209 #endif /* CONFIG_SMP */ 210 211 static void __init ppc47x_setup_arch(void) 212 { 213 214 /* No need to check the DMA config as we /know/ our windows are all of 215 * RAM. Lets hope that doesn't change */ 216 swiotlb_detect_4g(); 217 218 ppc47x_smp_init(); 219 } 220 221 static int board_rev = -1; 222 static int __init ppc47x_get_board_rev(void) 223 { 224 int reg; 225 u8 __iomem *fpga; 226 struct device_node *np = NULL; 227 228 if (of_machine_is_compatible("ibm,currituck")) { 229 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga"); 230 reg = 0; 231 } else if (of_machine_is_compatible("ibm,akebono")) { 232 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga"); 233 reg = 2; 234 } 235 236 if (!np) 237 goto fail; 238 239 fpga = of_iomap(np, 0); 240 of_node_put(np); 241 if (!fpga) 242 goto fail; 243 244 board_rev = ioread8(fpga + reg) & 0x03; 245 pr_info("%s: Found board revision %d\n", __func__, board_rev); 246 iounmap(fpga); 247 return 0; 248 249 fail: 250 pr_info("%s: Unable to find board revision\n", __func__); 251 return 0; 252 } 253 machine_arch_initcall(ppc47x_akebono, ppc47x_get_board_rev); 254 machine_arch_initcall(ppc47x_currituck, ppc47x_get_board_rev); 255 256 /* Use USB controller should have been hardware swizzled but it wasn't :( */ 257 static void ppc47x_pci_irq_fixup(struct pci_dev *dev) 258 { 259 if (dev->vendor == 0x1033 && (dev->device == 0x0035 || 260 dev->device == 0x00e0)) { 261 if (board_rev == 0) { 262 dev->irq = irq_create_mapping(NULL, 47); 263 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 264 } else if (board_rev == 2) { 265 dev->irq = irq_create_mapping(NULL, 49); 266 pr_info("%s: Mapping irq %d\n", __func__, dev->irq); 267 } else { 268 pr_alert("%s: Unknown board revision\n", __func__); 269 } 270 } 271 } 272 273 define_machine(ppc47x_akebono) { 274 .name = "PowerPC 47x (akebono)", 275 .compatible = "ibm,akebono", 276 .progress = udbg_progress, 277 .init_IRQ = ppc47x_init_irq, 278 .setup_arch = ppc47x_setup_arch, 279 .restart = ppc4xx_reset_system, 280 }; 281 282 define_machine(ppc47x_currituck) { 283 .name = "PowerPC 47x (currituck)", 284 .compatible = "ibm,currituck", 285 .progress = udbg_progress, 286 .init_IRQ = ppc47x_init_irq, 287 .pci_irq_fixup = ppc47x_pci_irq_fixup, 288 .setup_arch = ppc47x_setup_arch, 289 .restart = ppc4xx_reset_system, 290 }; 291