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_platform.h>
23 #include <linux/rtc.h>
24
25 #include <asm/machdep.h>
26 #include <asm/prom.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", 0 },
99 { }
100 };
101
102 static struct i2c_driver avr_driver = {
103 .driver = {
104 .name = "akebono-avr",
105 },
106 .probe_new = 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, ppc47x_device_probe);
118
ppc47x_init_irq(void)119 static void __init ppc47x_init_irq(void)
120 {
121 struct device_node *np;
122
123 /* Find top level interrupt controller */
124 for_each_node_with_property(np, "interrupt-controller") {
125 if (of_get_property(np, "interrupts", NULL) == NULL)
126 break;
127 }
128 if (np == NULL)
129 panic("Can't find top level interrupt controller");
130
131 /* Check type and do appropriate initialization */
132 if (of_device_is_compatible(np, "chrp,open-pic")) {
133 /* The MPIC driver will get everything it needs from the
134 * device-tree, just pass 0 to all arguments
135 */
136 struct mpic *mpic =
137 mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC ");
138 BUG_ON(mpic == NULL);
139 mpic_init(mpic);
140 ppc_md.get_irq = mpic_get_irq;
141 } else
142 panic("Unrecognized top level interrupt controller");
143 }
144
145 #ifdef CONFIG_SMP
smp_ppc47x_setup_cpu(int cpu)146 static void smp_ppc47x_setup_cpu(int cpu)
147 {
148 mpic_setup_this_cpu();
149 }
150
smp_ppc47x_kick_cpu(int cpu)151 static int smp_ppc47x_kick_cpu(int cpu)
152 {
153 struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
154 const u64 *spin_table_addr_prop;
155 u32 *spin_table;
156 extern void start_secondary_47x(void);
157
158 BUG_ON(cpunode == NULL);
159
160 /* Assume spin table. We could test for the enable-method in
161 * the device-tree but currently there's little point as it's
162 * our only supported method
163 */
164 spin_table_addr_prop =
165 of_get_property(cpunode, "cpu-release-addr", NULL);
166
167 if (spin_table_addr_prop == NULL) {
168 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
169 cpu);
170 return 1;
171 }
172
173 /* Assume it's mapped as part of the linear mapping. This is a bit
174 * fishy but will work fine for now
175 *
176 * XXX: Is there any reason to assume differently?
177 */
178 spin_table = (u32 *)__va(*spin_table_addr_prop);
179 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
180
181 spin_table[3] = cpu;
182 smp_wmb();
183 spin_table[1] = __pa(start_secondary_47x);
184 mb();
185
186 return 0;
187 }
188
189 static struct smp_ops_t ppc47x_smp_ops = {
190 .probe = smp_mpic_probe,
191 .message_pass = smp_mpic_message_pass,
192 .setup_cpu = smp_ppc47x_setup_cpu,
193 .kick_cpu = smp_ppc47x_kick_cpu,
194 .give_timebase = smp_generic_give_timebase,
195 .take_timebase = smp_generic_take_timebase,
196 };
197
ppc47x_smp_init(void)198 static void __init ppc47x_smp_init(void)
199 {
200 if (mmu_has_feature(MMU_FTR_TYPE_47x))
201 smp_ops = &ppc47x_smp_ops;
202 }
203
204 #else /* CONFIG_SMP */
ppc47x_smp_init(void)205 static void __init ppc47x_smp_init(void) { }
206 #endif /* CONFIG_SMP */
207
ppc47x_setup_arch(void)208 static void __init ppc47x_setup_arch(void)
209 {
210
211 /* No need to check the DMA config as we /know/ our windows are all of
212 * RAM. Lets hope that doesn't change */
213 swiotlb_detect_4g();
214
215 ppc47x_smp_init();
216 }
217
218 static int board_rev = -1;
ppc47x_get_board_rev(void)219 static int __init ppc47x_get_board_rev(void)
220 {
221 int reg;
222 u8 __iomem *fpga;
223 struct device_node *np = NULL;
224
225 if (of_machine_is_compatible("ibm,currituck")) {
226 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
227 reg = 0;
228 } else if (of_machine_is_compatible("ibm,akebono")) {
229 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
230 reg = 2;
231 }
232
233 if (!np)
234 goto fail;
235
236 fpga = of_iomap(np, 0);
237 of_node_put(np);
238 if (!fpga)
239 goto fail;
240
241 board_rev = ioread8(fpga + reg) & 0x03;
242 pr_info("%s: Found board revision %d\n", __func__, board_rev);
243 iounmap(fpga);
244 return 0;
245
246 fail:
247 pr_info("%s: Unable to find board revision\n", __func__);
248 return 0;
249 }
250 machine_arch_initcall(ppc47x, ppc47x_get_board_rev);
251
252 /* Use USB controller should have been hardware swizzled but it wasn't :( */
ppc47x_pci_irq_fixup(struct pci_dev * dev)253 static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
254 {
255 if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
256 dev->device == 0x00e0)) {
257 if (board_rev == 0) {
258 dev->irq = irq_create_mapping(NULL, 47);
259 pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
260 } else if (board_rev == 2) {
261 dev->irq = irq_create_mapping(NULL, 49);
262 pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
263 } else {
264 pr_alert("%s: Unknown board revision\n", __func__);
265 }
266 }
267 }
268
269 /*
270 * Called very early, MMU is off, device-tree isn't unflattened
271 */
ppc47x_probe(void)272 static int __init ppc47x_probe(void)
273 {
274 if (of_machine_is_compatible("ibm,akebono"))
275 return 1;
276
277 if (of_machine_is_compatible("ibm,currituck")) {
278 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup;
279 return 1;
280 }
281
282 return 0;
283 }
284
define_machine(ppc47x)285 define_machine(ppc47x) {
286 .name = "PowerPC 47x",
287 .probe = ppc47x_probe,
288 .progress = udbg_progress,
289 .init_IRQ = ppc47x_init_irq,
290 .setup_arch = ppc47x_setup_arch,
291 .restart = ppc4xx_reset_system,
292 .calibrate_decr = generic_calibrate_decr,
293 };
294