2 * PowerPC 476FPE board specific routines
4 * Copyright © 2013 Tony Breeds IBM Corporation
5 * Copyright © 2013 Alistair Popple IBM Corporation
7 * Based on earlier code:
8 * Matt Porter <mporter@kernel.crashing.org>
9 * Copyright 2002-2005 MontaVista Software Inc.
11 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
12 * Copyright (c) 2003-2005 Zultys Technologies
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
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.
24 #include <linux/init.h>
26 #include <linux/of_platform.h>
27 #include <linux/rtc.h>
29 #include <asm/machdep.h>
34 #include <asm/ppc4xx.h>
37 #include <asm/swiotlb.h>
39 #include <linux/pci.h>
40 #include <linux/i2c.h>
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", },
50 /* The EEPROM is missing and the default values are bogus. This forces USB in
52 static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
54 if (of_machine_is_compatible("ibm,currituck")) {
55 pci_write_config_dword(dev, 0xe0, 0x0114231f);
56 pci_write_config_dword(dev, 0xe4, 0x00006c40);
59 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
61 /* Akebono has an AVR microcontroller attached to the I2C bus
62 * which is used to power off/reset the system. */
64 /* AVR I2C Commands */
65 #define AVR_PWRCTL_CMD (0x26)
67 /* Flags for the power control I2C commands */
68 #define AVR_PWRCTL_PWROFF (0x01)
69 #define AVR_PWRCTL_RESET (0x02)
71 static struct i2c_client *avr_i2c_client;
72 static void __noreturn avr_halt_system(int pwrctl_flags)
74 /* Request the AVR to reset the system */
75 i2c_smbus_write_byte_data(avr_i2c_client,
76 AVR_PWRCTL_CMD, pwrctl_flags);
78 /* Wait for system to be reset */
83 static void avr_power_off_system(void)
85 avr_halt_system(AVR_PWRCTL_PWROFF);
88 static void __noreturn avr_reset_system(char *cmd)
90 avr_halt_system(AVR_PWRCTL_RESET);
93 static int avr_probe(struct i2c_client *client,
94 const struct i2c_device_id *id)
96 avr_i2c_client = client;
97 ppc_md.restart = avr_reset_system;
98 pm_power_off = avr_power_off_system;
102 static const struct i2c_device_id avr_id[] = {
103 { "akebono-avr", 0 },
107 static struct i2c_driver avr_driver = {
109 .name = "akebono-avr",
115 static int __init ppc47x_device_probe(void)
117 i2c_add_driver(&avr_driver);
118 of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
122 machine_device_initcall(ppc47x, ppc47x_device_probe);
124 static void __init ppc47x_init_irq(void)
126 struct device_node *np;
128 /* Find top level interrupt controller */
129 for_each_node_with_property(np, "interrupt-controller") {
130 if (of_get_property(np, "interrupts", NULL) == NULL)
134 panic("Can't find top level interrupt controller");
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
142 mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC ");
143 BUG_ON(mpic == NULL);
145 ppc_md.get_irq = mpic_get_irq;
147 panic("Unrecognized top level interrupt controller");
151 static void smp_ppc47x_setup_cpu(int cpu)
153 mpic_setup_this_cpu();
156 static int smp_ppc47x_kick_cpu(int cpu)
158 struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
159 const u64 *spin_table_addr_prop;
161 extern void start_secondary_47x(void);
163 BUG_ON(cpunode == NULL);
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
169 spin_table_addr_prop =
170 of_get_property(cpunode, "cpu-release-addr", NULL);
172 if (spin_table_addr_prop == NULL) {
173 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
178 /* Assume it's mapped as part of the linear mapping. This is a bit
179 * fishy but will work fine for now
181 * XXX: Is there any reason to assume differently?
183 spin_table = (u32 *)__va(*spin_table_addr_prop);
184 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
188 spin_table[1] = __pa(start_secondary_47x);
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,
203 static void __init ppc47x_smp_init(void)
205 if (mmu_has_feature(MMU_FTR_TYPE_47x))
206 smp_ops = &ppc47x_smp_ops;
209 #else /* CONFIG_SMP */
210 static void __init ppc47x_smp_init(void) { }
211 #endif /* CONFIG_SMP */
213 static void __init ppc47x_setup_arch(void)
216 /* No need to check the DMA config as we /know/ our windows are all of
217 * RAM. Lets hope that doesn't change */
223 static int board_rev = -1;
224 static int __init ppc47x_get_board_rev(void)
228 struct device_node *np = NULL;
230 if (of_machine_is_compatible("ibm,currituck")) {
231 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
233 } else if (of_machine_is_compatible("ibm,akebono")) {
234 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
241 fpga = (u8 *) of_iomap(np, 0);
246 board_rev = ioread8(fpga + reg) & 0x03;
247 pr_info("%s: Found board revision %d\n", __func__, board_rev);
252 pr_info("%s: Unable to find board revision\n", __func__);
255 machine_arch_initcall(ppc47x, ppc47x_get_board_rev);
257 /* Use USB controller should have been hardware swizzled but it wasn't :( */
258 static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
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);
269 pr_alert("%s: Unknown board revision\n", __func__);
275 * Called very early, MMU is off, device-tree isn't unflattened
277 static int __init ppc47x_probe(void)
279 if (of_machine_is_compatible("ibm,akebono"))
282 if (of_machine_is_compatible("ibm,currituck")) {
283 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup;
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,