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_each_child_of_node(root, pcictrl)
86 		if (of_node_name_eq(pcictrl, "pci"))
87 			break;
88 
89 	of_node_put(root);
90 
91 	if (pcictrl == NULL) {
92 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
93 		       ": Unable to find the PCI bridge node\n");
94 		return;
95 	}
96 
97 	bus_range = of_get_property(pcictrl, "bus-range", &len);
98 	if (bus_range == NULL || len < 2 * sizeof(int)) {
99 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
100 		       ": Can't get bus-range for %pOF\n", pcictrl);
101 		goto out_put;
102 	}
103 
104 	if (bus_range[1] == bus_range[0])
105 		printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
106 		       bus_range[0]);
107 	else
108 		printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
109 		       bus_range[0], bus_range[1]);
110 	printk(" controlled by %pOF\n", pcictrl);
111 	printk("\n");
112 
113 	hose = pcibios_alloc_controller(pcictrl);
114 	if (!hose) {
115 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
116 		       ": Can't allocate PCI controller structure for %pOF\n",
117 		       pcictrl);
118 		goto out_put;
119 	}
120 
121 	hose->first_busno = bus_range[0];
122 	hose->last_busno = bus_range[1];
123 	hose->ops = &rtas_pci_ops;
124 
125 	pci_process_bridge_OF_ranges(hose, pcictrl, 0);
126 	return;
127 out_put:
128 	of_node_put(pcictrl);
129 }
130 
131 #else
132 static void __init efika_pcisetup(void)
133 {}
134 #endif
135 
136 
137 
138 /* ------------------------------------------------------------------------ */
139 /* Platform setup                                                           */
140 /* ------------------------------------------------------------------------ */
141 
142 static void efika_show_cpuinfo(struct seq_file *m)
143 {
144 	struct device_node *root;
145 	const char *revision;
146 	const char *codegendescription;
147 	const char *codegenvendor;
148 
149 	root = of_find_node_by_path("/");
150 	if (!root)
151 		return;
152 
153 	revision = of_get_property(root, "revision", NULL);
154 	codegendescription = of_get_property(root, "CODEGEN,description", NULL);
155 	codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL);
156 
157 	if (codegendescription)
158 		seq_printf(m, "machine\t\t: %s\n", codegendescription);
159 	else
160 		seq_printf(m, "machine\t\t: Efika\n");
161 
162 	if (revision)
163 		seq_printf(m, "revision\t: %s\n", revision);
164 
165 	if (codegenvendor)
166 		seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
167 
168 	of_node_put(root);
169 }
170 
171 #ifdef CONFIG_PM
172 static void efika_suspend_prepare(void __iomem *mbar)
173 {
174 	u8 pin = 4;	/* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
175 	u8 level = 1;	/* wakeup on high level */
176 	/* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
177 	mpc52xx_set_wakeup_gpio(pin, level);
178 }
179 #endif
180 
181 static void __init efika_setup_arch(void)
182 {
183 	rtas_initialize();
184 
185 	/* Map important registers from the internal memory map */
186 	mpc52xx_map_common_devices();
187 
188 	efika_pcisetup();
189 
190 #ifdef CONFIG_PM
191 	mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
192 	mpc52xx_pm_init();
193 #endif
194 
195 	if (ppc_md.progress)
196 		ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
197 }
198 
199 static int __init efika_probe(void)
200 {
201 	const char *model = of_get_property(of_root, "model", NULL);
202 
203 	if (model == NULL)
204 		return 0;
205 	if (strcmp(model, "EFIKA5K2"))
206 		return 0;
207 
208 	ISA_DMA_THRESHOLD = ~0L;
209 	DMA_MODE_READ = 0x44;
210 	DMA_MODE_WRITE = 0x48;
211 
212 	pm_power_off = rtas_power_off;
213 
214 	return 1;
215 }
216 
217 define_machine(efika)
218 {
219 	.name			= EFIKA_PLATFORM_NAME,
220 	.probe			= efika_probe,
221 	.setup_arch		= efika_setup_arch,
222 	.init			= mpc52xx_declare_of_platform_devices,
223 	.show_cpuinfo		= efika_show_cpuinfo,
224 	.init_IRQ		= mpc52xx_init_irq,
225 	.get_irq		= mpc52xx_get_irq,
226 	.restart		= rtas_restart,
227 	.halt			= rtas_halt,
228 	.set_rtc_time		= rtas_set_rtc_time,
229 	.get_rtc_time		= rtas_get_rtc_time,
230 	.progress		= rtas_progress,
231 	.get_boot_time		= rtas_get_boot_time,
232 	.calibrate_decr		= generic_calibrate_decr,
233 #ifdef CONFIG_PCI
234 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
235 #endif
236 };
237 
238