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
38static 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 */
48static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
49{
50 if (of_machine_is_compatible(compat: "ibm,currituck")) {
51 pci_write_config_dword(dev, where: 0xe0, val: 0x0114231f);
52 pci_write_config_dword(dev, where: 0xe4, val: 0x00006c40);
53 }
54}
55DECLARE_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
67static struct i2c_client *avr_i2c_client;
68static void __noreturn avr_halt_system(int pwrctl_flags)
69{
70 /* Request the AVR to reset the system */
71 i2c_smbus_write_byte_data(client: avr_i2c_client,
72 AVR_PWRCTL_CMD, value: pwrctl_flags);
73
74 /* Wait for system to be reset */
75 while (1)
76 ;
77}
78
79static void avr_power_off_system(void)
80{
81 avr_halt_system(AVR_PWRCTL_PWROFF);
82}
83
84static void __noreturn avr_reset_system(char *cmd)
85{
86 avr_halt_system(AVR_PWRCTL_RESET);
87}
88
89static 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
97static const struct i2c_device_id avr_id[] = {
98 { "akebono-avr" },
99 { }
100};
101
102static struct i2c_driver avr_driver = {
103 .driver = {
104 .name = "akebono-avr",
105 },
106 .probe = avr_probe,
107 .id_table = avr_id,
108};
109
110static int __init ppc47x_device_probe(void)
111{
112 i2c_add_driver(&avr_driver);
113 of_platform_bus_probe(NULL, matches: ppc47x_of_bus, NULL);
114
115 return 0;
116}
117machine_device_initcall(ppc47x_akebono, ppc47x_device_probe);
118machine_device_initcall(ppc47x_currituck, ppc47x_device_probe);
119
120static 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, propname: "interrupts"))
127 break;
128 }
129 if (np == NULL)
130 panic(fmt: "Can't find top level interrupt controller");
131
132 /* Check type and do appropriate initialization */
133 if (of_device_is_compatible(device: 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(fmt: "Unrecognized top level interrupt controller");
144
145 of_node_put(node: np);
146}
147
148#ifdef CONFIG_SMP
149static void smp_ppc47x_setup_cpu(int cpu)
150{
151 mpic_setup_this_cpu();
152}
153
154static 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(node: cpunode, name: "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
192static 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
201static 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 */
208static void __init ppc47x_smp_init(void) { }
209#endif /* CONFIG_SMP */
210
211static 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
221static int board_rev = -1;
222static 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(compat: "ibm,currituck")) {
229 np = of_find_compatible_node(NULL, NULL, compat: "ibm,currituck-fpga");
230 reg = 0;
231 } else if (of_machine_is_compatible(compat: "ibm,akebono")) {
232 np = of_find_compatible_node(NULL, NULL, compat: "ibm,akebono-fpga");
233 reg = 2;
234 }
235
236 if (!np)
237 goto fail;
238
239 fpga = of_iomap(node: np, index: 0);
240 of_node_put(node: 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(addr: fpga);
247 return 0;
248
249fail:
250 pr_info("%s: Unable to find board revision\n", __func__);
251 return 0;
252}
253machine_arch_initcall(ppc47x_akebono, ppc47x_get_board_rev);
254machine_arch_initcall(ppc47x_currituck, ppc47x_get_board_rev);
255
256/* Use USB controller should have been hardware swizzled but it wasn't :( */
257static 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, hwirq: 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, hwirq: 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
273define_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
282define_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

source code of linux/arch/powerpc/platforms/44x/ppc476.c