1 /*
2  * Efika 5K2 platform code
3  * Some code really inspired from the lite5200b platform.
4  *
5  * Copyright (C) 2006 bplan GmbH
6  *
7  * This file is licensed under the terms of the GNU General Public License
8  * version 2. This program is licensed "as is" without any warranty of any
9  * kind, whether express or implied.
10  */
11 
12 #include <linux/init.h>
13 #include <generated/utsrelease.h>
14 #include <linux/pci.h>
15 #include <linux/of.h>
16 #include <asm/dma.h>
17 #include <asm/prom.h>
18 #include <asm/time.h>
19 #include <asm/machdep.h>
20 #include <asm/rtas.h>
21 #include <asm/mpc52xx.h>
22 
23 #define EFIKA_PLATFORM_NAME "Efika"
24 
25 
26 /* ------------------------------------------------------------------------ */
27 /* PCI accesses thru RTAS                                                   */
28 /* ------------------------------------------------------------------------ */
29 
30 #ifdef CONFIG_PCI
31 
32 /*
33  * Access functions for PCI config space using RTAS calls.
34  */
35 static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
36 			    int len, u32 * val)
37 {
38 	struct pci_controller *hose = pci_bus_to_host(bus);
39 	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
40 	    | (((bus->number - hose->first_busno) & 0xff) << 16)
41 	    | (hose->global_number << 24);
42 	int ret = -1;
43 	int rval;
44 
45 	rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
46 	*val = ret;
47 	return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
48 }
49 
50 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
51 			     int offset, int len, u32 val)
52 {
53 	struct pci_controller *hose = pci_bus_to_host(bus);
54 	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
55 	    | (((bus->number - hose->first_busno) & 0xff) << 16)
56 	    | (hose->global_number << 24);
57 	int rval;
58 
59 	rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
60 			 addr, len, val);
61 	return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
62 }
63 
64 static struct pci_ops rtas_pci_ops = {
65 	.read = rtas_read_config,
66 	.write = rtas_write_config,
67 };
68 
69 
70 static void __init efika_pcisetup(void)
71 {
72 	const int *bus_range;
73 	int len;
74 	struct pci_controller *hose;
75 	struct device_node *root;
76 	struct device_node *pcictrl;
77 
78 	root = of_find_node_by_path("/");
79 	if (root == NULL) {
80 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
81 		       ": Unable to find the root node\n");
82 		return;
83 	}
84 
85 	for (pcictrl = NULL;;) {
86 		pcictrl = of_get_next_child(root, pcictrl);
87 		if ((pcictrl == NULL) || (strcmp(pcictrl->name, "pci") == 0))
88 			break;
89 	}
90 
91 	of_node_put(root);
92 
93 	if (pcictrl == NULL) {
94 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
95 		       ": Unable to find the PCI bridge node\n");
96 		return;
97 	}
98 
99 	bus_range = of_get_property(pcictrl, "bus-range", &len);
100 	if (bus_range == NULL || len < 2 * sizeof(int)) {
101 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
102 		       ": Can't get bus-range for %pOF\n", pcictrl);
103 		goto out_put;
104 	}
105 
106 	if (bus_range[1] == bus_range[0])
107 		printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
108 		       bus_range[0]);
109 	else
110 		printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
111 		       bus_range[0], bus_range[1]);
112 	printk(" controlled by %pOF\n", pcictrl);
113 	printk("\n");
114 
115 	hose = pcibios_alloc_controller(pcictrl);
116 	if (!hose) {
117 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
118 		       ": Can't allocate PCI controller structure for %pOF\n",
119 		       pcictrl);
120 		goto out_put;
121 	}
122 
123 	hose->first_busno = bus_range[0];
124 	hose->last_busno = bus_range[1];
125 	hose->ops = &rtas_pci_ops;
126 
127 	pci_process_bridge_OF_ranges(hose, pcictrl, 0);
128 	return;
129 out_put:
130 	of_node_put(pcictrl);
131 }
132 
133 #else
134 static void __init efika_pcisetup(void)
135 {}
136 #endif
137 
138 
139 
140 /* ------------------------------------------------------------------------ */
141 /* Platform setup                                                           */
142 /* ------------------------------------------------------------------------ */
143 
144 static void efika_show_cpuinfo(struct seq_file *m)
145 {
146 	struct device_node *root;
147 	const char *revision;
148 	const char *codegendescription;
149 	const char *codegenvendor;
150 
151 	root = of_find_node_by_path("/");
152 	if (!root)
153 		return;
154 
155 	revision = of_get_property(root, "revision", NULL);
156 	codegendescription = of_get_property(root, "CODEGEN,description", NULL);
157 	codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL);
158 
159 	if (codegendescription)
160 		seq_printf(m, "machine\t\t: %s\n", codegendescription);
161 	else
162 		seq_printf(m, "machine\t\t: Efika\n");
163 
164 	if (revision)
165 		seq_printf(m, "revision\t: %s\n", revision);
166 
167 	if (codegenvendor)
168 		seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
169 
170 	of_node_put(root);
171 }
172 
173 #ifdef CONFIG_PM
174 static void efika_suspend_prepare(void __iomem *mbar)
175 {
176 	u8 pin = 4;	/* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
177 	u8 level = 1;	/* wakeup on high level */
178 	/* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
179 	mpc52xx_set_wakeup_gpio(pin, level);
180 }
181 #endif
182 
183 static void __init efika_setup_arch(void)
184 {
185 	rtas_initialize();
186 
187 	/* Map important registers from the internal memory map */
188 	mpc52xx_map_common_devices();
189 
190 	efika_pcisetup();
191 
192 #ifdef CONFIG_PM
193 	mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
194 	mpc52xx_pm_init();
195 #endif
196 
197 	if (ppc_md.progress)
198 		ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
199 }
200 
201 static int __init efika_probe(void)
202 {
203 	const char *model = of_get_property(of_root, "model", NULL);
204 
205 	if (model == NULL)
206 		return 0;
207 	if (strcmp(model, "EFIKA5K2"))
208 		return 0;
209 
210 	ISA_DMA_THRESHOLD = ~0L;
211 	DMA_MODE_READ = 0x44;
212 	DMA_MODE_WRITE = 0x48;
213 
214 	pm_power_off = rtas_power_off;
215 
216 	return 1;
217 }
218 
219 define_machine(efika)
220 {
221 	.name			= EFIKA_PLATFORM_NAME,
222 	.probe			= efika_probe,
223 	.setup_arch		= efika_setup_arch,
224 	.init			= mpc52xx_declare_of_platform_devices,
225 	.show_cpuinfo		= efika_show_cpuinfo,
226 	.init_IRQ		= mpc52xx_init_irq,
227 	.get_irq		= mpc52xx_get_irq,
228 	.restart		= rtas_restart,
229 	.halt			= rtas_halt,
230 	.set_rtc_time		= rtas_set_rtc_time,
231 	.get_rtc_time		= rtas_get_rtc_time,
232 	.progress		= rtas_progress,
233 	.get_boot_time		= rtas_get_boot_time,
234 	.calibrate_decr		= generic_calibrate_decr,
235 #ifdef CONFIG_PCI
236 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
237 #endif
238 };
239 
240