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 */
quirk_ppc_currituck_usb_fixup(struct pci_dev * dev)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;
avr_halt_system(int pwrctl_flags)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
avr_power_off_system(void)79 static void avr_power_off_system(void)
80 {
81 avr_halt_system(AVR_PWRCTL_PWROFF);
82 }
83
avr_reset_system(char * cmd)84 static void __noreturn avr_reset_system(char *cmd)
85 {
86 avr_halt_system(AVR_PWRCTL_RESET);
87 }
88
avr_probe(struct i2c_client * client)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" },
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
ppc47x_device_probe(void)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
ppc47x_init_irq(void)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
smp_ppc47x_setup_cpu(int cpu)149 static void smp_ppc47x_setup_cpu(int cpu)
150 {
151 mpic_setup_this_cpu();
152 }
153
smp_ppc47x_kick_cpu(int cpu)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
ppc47x_smp_init(void)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 */
ppc47x_smp_init(void)208 static void __init ppc47x_smp_init(void) { }
209 #endif /* CONFIG_SMP */
210
ppc47x_setup_arch(void)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;
ppc47x_get_board_rev(void)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 :( */
ppc47x_pci_irq_fixup(struct pci_dev * dev)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
define_machine(ppc47x_akebono)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
define_machine(ppc47x_currituck)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