1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  linux/arch/powerpc/platforms/cell/cell_setup.c
4  *
5  *  Copyright (C) 1995  Linus Torvalds
6  *  Adapted from 'alpha' version by Gary Thomas
7  *  Modified by Cort Dougan (cort@cs.nmt.edu)
8  *  Modified by PPC64 Team, IBM Corp
9  *  Modified by Cell Team, IBM Deutschland Entwicklung GmbH
10  */
11 #undef DEBUG
12 
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/stddef.h>
17 #include <linux/export.h>
18 #include <linux/unistd.h>
19 #include <linux/user.h>
20 #include <linux/reboot.h>
21 #include <linux/init.h>
22 #include <linux/delay.h>
23 #include <linux/irq.h>
24 #include <linux/seq_file.h>
25 #include <linux/root_dev.h>
26 #include <linux/console.h>
27 #include <linux/mutex.h>
28 #include <linux/memory_hotplug.h>
29 #include <linux/of_platform.h>
30 
31 #include <asm/mmu.h>
32 #include <asm/processor.h>
33 #include <asm/io.h>
34 #include <asm/rtas.h>
35 #include <asm/pci-bridge.h>
36 #include <asm/iommu.h>
37 #include <asm/dma.h>
38 #include <asm/machdep.h>
39 #include <asm/time.h>
40 #include <asm/nvram.h>
41 #include <asm/cputable.h>
42 #include <asm/ppc-pci.h>
43 #include <asm/irq.h>
44 #include <asm/spu.h>
45 #include <asm/spu_priv1.h>
46 #include <asm/udbg.h>
47 #include <asm/mpic.h>
48 #include <asm/cell-regs.h>
49 #include <asm/io-workarounds.h>
50 
51 #include "cell.h"
52 #include "interrupt.h"
53 #include "pervasive.h"
54 #include "ras.h"
55 
56 #ifdef DEBUG
57 #define DBG(fmt...) udbg_printf(fmt)
58 #else
59 #define DBG(fmt...)
60 #endif
61 
62 static void cell_show_cpuinfo(struct seq_file *m)
63 {
64 	struct device_node *root;
65 	const char *model = "";
66 
67 	root = of_find_node_by_path("/");
68 	if (root)
69 		model = of_get_property(root, "model", NULL);
70 	seq_printf(m, "machine\t\t: CHRP %s\n", model);
71 	of_node_put(root);
72 }
73 
74 static void cell_progress(char *s, unsigned short hex)
75 {
76 	printk("*** %04x : %s\n", hex, s ? s : "");
77 }
78 
79 static void cell_fixup_pcie_rootcomplex(struct pci_dev *dev)
80 {
81 	struct pci_controller *hose;
82 	const char *s;
83 	int i;
84 
85 	if (!machine_is(cell))
86 		return;
87 
88 	/* We're searching for a direct child of the PHB */
89 	if (dev->bus->self != NULL || dev->devfn != 0)
90 		return;
91 
92 	hose = pci_bus_to_host(dev->bus);
93 	if (hose == NULL)
94 		return;
95 
96 	/* Only on PCIE */
97 	if (!of_device_is_compatible(hose->dn, "pciex"))
98 		return;
99 
100 	/* And only on axon */
101 	s = of_get_property(hose->dn, "model", NULL);
102 	if (!s || strcmp(s, "Axon") != 0)
103 		return;
104 
105 	for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
106 		dev->resource[i].start = dev->resource[i].end = 0;
107 		dev->resource[i].flags = 0;
108 	}
109 
110 	printk(KERN_DEBUG "PCI: Hiding resources on Axon PCIE RC %s\n",
111 	       pci_name(dev));
112 }
113 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, cell_fixup_pcie_rootcomplex);
114 
115 static int cell_setup_phb(struct pci_controller *phb)
116 {
117 	const char *model;
118 	struct device_node *np;
119 
120 	int rc = rtas_setup_phb(phb);
121 	if (rc)
122 		return rc;
123 
124 	phb->controller_ops = cell_pci_controller_ops;
125 
126 	np = phb->dn;
127 	model = of_get_property(np, "model", NULL);
128 	if (model == NULL || !of_node_name_eq(np, "pci"))
129 		return 0;
130 
131 	/* Setup workarounds for spider */
132 	if (strcmp(model, "Spider"))
133 		return 0;
134 
135 	iowa_register_bus(phb, &spiderpci_ops, &spiderpci_iowa_init,
136 				  (void *)SPIDER_PCI_REG_BASE);
137 	return 0;
138 }
139 
140 static const struct of_device_id cell_bus_ids[] __initconst = {
141 	{ .type = "soc", },
142 	{ .compatible = "soc", },
143 	{ .type = "spider", },
144 	{ .type = "axon", },
145 	{ .type = "plb5", },
146 	{ .type = "plb4", },
147 	{ .type = "opb", },
148 	{ .type = "ebc", },
149 	{},
150 };
151 
152 static int __init cell_publish_devices(void)
153 {
154 	struct device_node *root = of_find_node_by_path("/");
155 	struct device_node *np;
156 	int node;
157 
158 	/* Publish OF platform devices for southbridge IOs */
159 	of_platform_bus_probe(NULL, cell_bus_ids, NULL);
160 
161 	/* On spider based blades, we need to manually create the OF
162 	 * platform devices for the PCI host bridges
163 	 */
164 	for_each_child_of_node(root, np) {
165 		if (!of_node_is_type(np, "pci") && !of_node_is_type(np, "pciex"))
166 			continue;
167 		of_platform_device_create(np, NULL, NULL);
168 	}
169 
170 	of_node_put(root);
171 
172 	/* There is no device for the MIC memory controller, thus we create
173 	 * a platform device for it to attach the EDAC driver to.
174 	 */
175 	for_each_online_node(node) {
176 		if (cbe_get_cpu_mic_tm_regs(cbe_node_to_cpu(node)) == NULL)
177 			continue;
178 		platform_device_register_simple("cbe-mic", node, NULL, 0);
179 	}
180 
181 	return 0;
182 }
183 machine_subsys_initcall(cell, cell_publish_devices);
184 
185 static void __init mpic_init_IRQ(void)
186 {
187 	struct device_node *dn;
188 	struct mpic *mpic;
189 
190 	for_each_node_by_name(dn, "interrupt-controller") {
191 		if (!of_device_is_compatible(dn, "CBEA,platform-open-pic"))
192 			continue;
193 
194 		/* The MPIC driver will get everything it needs from the
195 		 * device-tree, just pass 0 to all arguments
196 		 */
197 		mpic = mpic_alloc(dn, 0, MPIC_SECONDARY | MPIC_NO_RESET,
198 				0, 0, " MPIC     ");
199 		if (mpic == NULL)
200 			continue;
201 		mpic_init(mpic);
202 	}
203 }
204 
205 
206 static void __init cell_init_irq(void)
207 {
208 	iic_init_IRQ();
209 	spider_init_IRQ();
210 	mpic_init_IRQ();
211 }
212 
213 static void __init cell_set_dabrx(void)
214 {
215 	mtspr(SPRN_DABRX, DABRX_KERNEL | DABRX_USER);
216 }
217 
218 static void __init cell_setup_arch(void)
219 {
220 #ifdef CONFIG_SPU_BASE
221 	spu_priv1_ops = &spu_priv1_mmio_ops;
222 	spu_management_ops = &spu_management_of_ops;
223 #endif
224 
225 	cbe_regs_init();
226 
227 	cell_set_dabrx();
228 
229 #ifdef CONFIG_CBE_RAS
230 	cbe_ras_init();
231 #endif
232 
233 #ifdef CONFIG_SMP
234 	smp_init_cell();
235 #endif
236 	/* init to some ~sane value until calibrate_delay() runs */
237 	loops_per_jiffy = 50000000;
238 
239 	/* Find and initialize PCI host bridges */
240 	init_pci_config_tokens();
241 
242 	cbe_pervasive_init();
243 
244 	mmio_nvram_init();
245 }
246 
247 static int __init cell_probe(void)
248 {
249 	if (!of_machine_is_compatible("IBM,CBEA") &&
250 	    !of_machine_is_compatible("IBM,CPBW-1.0"))
251 		return 0;
252 
253 	pm_power_off = rtas_power_off;
254 
255 	return 1;
256 }
257 
258 define_machine(cell) {
259 	.name			= "Cell",
260 	.probe			= cell_probe,
261 	.setup_arch		= cell_setup_arch,
262 	.show_cpuinfo		= cell_show_cpuinfo,
263 	.restart		= rtas_restart,
264 	.halt			= rtas_halt,
265 	.get_boot_time		= rtas_get_boot_time,
266 	.get_rtc_time		= rtas_get_rtc_time,
267 	.set_rtc_time		= rtas_set_rtc_time,
268 	.calibrate_decr		= generic_calibrate_decr,
269 	.progress		= cell_progress,
270 	.init_IRQ       	= cell_init_irq,
271 	.pci_setup_phb		= cell_setup_phb,
272 };
273 
274 struct pci_controller_ops cell_pci_controller_ops;
275