1 /*
2 * PowerPC 476FPE board specific routines
3 *
4 * Copyright © 2013 Tony Breeds IBM Corporation
5 * Copyright © 2013 Alistair Popple IBM Corporation
6 *
7 * Based on earlier code:
8 * Matt Porter <mporter@kernel.crashing.org>
9 * Copyright 2002-2005 MontaVista Software Inc.
10 *
11 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
12 * Copyright (c) 2003-2005 Zultys Technologies
13 *
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
17 *
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.
22 */
23
24 #include <linux/init.h>
25 #include <linux/of.h>
26 #include <linux/of_platform.h>
27 #include <linux/rtc.h>
28
29 #include <asm/machdep.h>
30 #include <asm/prom.h>
31 #include <asm/udbg.h>
32 #include <asm/time.h>
33 #include <asm/uic.h>
34 #include <asm/ppc4xx.h>
35 #include <asm/mpic.h>
36 #include <asm/mmu.h>
37
38 #include <linux/pci.h>
39 #include <linux/i2c.h>
40
41 static const struct of_device_id ppc47x_of_bus[] __initconst = {
42 { .compatible = "ibm,plb4", },
43 { .compatible = "ibm,plb6", },
44 { .compatible = "ibm,opb", },
45 { .compatible = "ibm,ebc", },
46 {},
47 };
48
49 /* The EEPROM is missing and the default values are bogus. This forces USB in
50 * to EHCI mode */
quirk_ppc_currituck_usb_fixup(struct pci_dev * dev)51 static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
52 {
53 if (of_machine_is_compatible("ibm,currituck")) {
54 pci_write_config_dword(dev, 0xe0, 0x0114231f);
55 pci_write_config_dword(dev, 0xe4, 0x00006c40);
56 }
57 }
58 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
59
60 /* Akebono has an AVR microcontroller attached to the I2C bus
61 * which is used to power off/reset the system. */
62
63 /* AVR I2C Commands */
64 #define AVR_PWRCTL_CMD (0x26)
65
66 /* Flags for the power control I2C commands */
67 #define AVR_PWRCTL_PWROFF (0x01)
68 #define AVR_PWRCTL_RESET (0x02)
69
70 static struct i2c_client *avr_i2c_client;
avr_halt_system(int pwrctl_flags)71 static void avr_halt_system(int pwrctl_flags)
72 {
73 /* Request the AVR to reset the system */
74 i2c_smbus_write_byte_data(avr_i2c_client,
75 AVR_PWRCTL_CMD, pwrctl_flags);
76
77 /* Wait for system to be reset */
78 while (1)
79 ;
80 }
81
avr_power_off_system(void)82 static void avr_power_off_system(void)
83 {
84 avr_halt_system(AVR_PWRCTL_PWROFF);
85 }
86
avr_reset_system(char * cmd)87 static void avr_reset_system(char *cmd)
88 {
89 avr_halt_system(AVR_PWRCTL_RESET);
90 }
91
avr_probe(struct i2c_client * client,const struct i2c_device_id * id)92 static int avr_probe(struct i2c_client *client,
93 const struct i2c_device_id *id)
94 {
95 avr_i2c_client = client;
96 ppc_md.restart = avr_reset_system;
97 ppc_md.power_off = avr_power_off_system;
98 return 0;
99 }
100
101 static const struct i2c_device_id avr_id[] = {
102 { "akebono-avr", 0 },
103 { }
104 };
105
106 static struct i2c_driver avr_driver = {
107 .driver = {
108 .name = "akebono-avr",
109 },
110 .probe = avr_probe,
111 .id_table = avr_id,
112 };
113
ppc47x_device_probe(void)114 static int __init ppc47x_device_probe(void)
115 {
116 i2c_add_driver(&avr_driver);
117 of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
118
119 return 0;
120 }
121 machine_device_initcall(ppc47x, ppc47x_device_probe);
122
ppc47x_init_irq(void)123 static void __init ppc47x_init_irq(void)
124 {
125 struct device_node *np;
126
127 /* Find top level interrupt controller */
128 for_each_node_with_property(np, "interrupt-controller") {
129 if (of_get_property(np, "interrupts", NULL) == NULL)
130 break;
131 }
132 if (np == NULL)
133 panic("Can't find top level interrupt controller");
134
135 /* Check type and do appropriate initialization */
136 if (of_device_is_compatible(np, "chrp,open-pic")) {
137 /* The MPIC driver will get everything it needs from the
138 * device-tree, just pass 0 to all arguments
139 */
140 struct mpic *mpic =
141 mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC ");
142 BUG_ON(mpic == NULL);
143 mpic_init(mpic);
144 ppc_md.get_irq = mpic_get_irq;
145 } else
146 panic("Unrecognized top level interrupt controller");
147 }
148
149 #ifdef CONFIG_SMP
smp_ppc47x_setup_cpu(int cpu)150 static void smp_ppc47x_setup_cpu(int cpu)
151 {
152 mpic_setup_this_cpu();
153 }
154
smp_ppc47x_kick_cpu(int cpu)155 static int smp_ppc47x_kick_cpu(int cpu)
156 {
157 struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
158 const u64 *spin_table_addr_prop;
159 u32 *spin_table;
160 extern void start_secondary_47x(void);
161
162 BUG_ON(cpunode == NULL);
163
164 /* Assume spin table. We could test for the enable-method in
165 * the device-tree but currently there's little point as it's
166 * our only supported method
167 */
168 spin_table_addr_prop =
169 of_get_property(cpunode, "cpu-release-addr", NULL);
170
171 if (spin_table_addr_prop == NULL) {
172 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
173 cpu);
174 return 1;
175 }
176
177 /* Assume it's mapped as part of the linear mapping. This is a bit
178 * fishy but will work fine for now
179 *
180 * XXX: Is there any reason to assume differently?
181 */
182 spin_table = (u32 *)__va(*spin_table_addr_prop);
183 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
184
185 spin_table[3] = cpu;
186 smp_wmb();
187 spin_table[1] = __pa(start_secondary_47x);
188 mb();
189
190 return 0;
191 }
192
193 static struct smp_ops_t ppc47x_smp_ops = {
194 .probe = smp_mpic_probe,
195 .message_pass = smp_mpic_message_pass,
196 .setup_cpu = smp_ppc47x_setup_cpu,
197 .kick_cpu = smp_ppc47x_kick_cpu,
198 .give_timebase = smp_generic_give_timebase,
199 .take_timebase = smp_generic_take_timebase,
200 };
201
ppc47x_smp_init(void)202 static void __init ppc47x_smp_init(void)
203 {
204 if (mmu_has_feature(MMU_FTR_TYPE_47x))
205 smp_ops = &ppc47x_smp_ops;
206 }
207
208 #else /* CONFIG_SMP */
ppc47x_smp_init(void)209 static void __init ppc47x_smp_init(void) { }
210 #endif /* CONFIG_SMP */
211
ppc47x_setup_arch(void)212 static void __init ppc47x_setup_arch(void)
213 {
214
215 /* No need to check the DMA config as we /know/ our windows are all of
216 * RAM. Lets hope that doesn't change */
217 swiotlb_detect_4g();
218
219 ppc47x_smp_init();
220 }
221
222 static int board_rev = -1;
ppc47x_get_board_rev(void)223 static int __init ppc47x_get_board_rev(void)
224 {
225 int reg;
226 u8 *fpga;
227 struct device_node *np = NULL;
228
229 if (of_machine_is_compatible("ibm,currituck")) {
230 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
231 reg = 0;
232 } else if (of_machine_is_compatible("ibm,akebono")) {
233 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
234 reg = 2;
235 }
236
237 if (!np)
238 goto fail;
239
240 fpga = (u8 *) of_iomap(np, 0);
241 of_node_put(np);
242 if (!fpga)
243 goto fail;
244
245 board_rev = ioread8(fpga + reg) & 0x03;
246 pr_info("%s: Found board revision %d\n", __func__, board_rev);
247 iounmap(fpga);
248 return 0;
249
250 fail:
251 pr_info("%s: Unable to find board revision\n", __func__);
252 return 0;
253 }
254 machine_arch_initcall(ppc47x, 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
273 /*
274 * Called very early, MMU is off, device-tree isn't unflattened
275 */
ppc47x_probe(void)276 static int __init ppc47x_probe(void)
277 {
278 unsigned long root = of_get_flat_dt_root();
279
280 if (of_flat_dt_is_compatible(root, "ibm,akebono"))
281 return 1;
282
283 if (of_flat_dt_is_compatible(root, "ibm,currituck")) {
284 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup;
285 return 1;
286 }
287
288 return 0;
289 }
290
define_machine(ppc47x)291 define_machine(ppc47x) {
292 .name = "PowerPC 47x",
293 .probe = ppc47x_probe,
294 .progress = udbg_progress,
295 .init_IRQ = ppc47x_init_irq,
296 .setup_arch = ppc47x_setup_arch,
297 .restart = ppc4xx_reset_system,
298 .calibrate_decr = generic_calibrate_decr,
299 };
300