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/time.h>
18 #include <asm/machdep.h>
19 #include <asm/rtas.h>
20 #include <asm/mpc52xx.h>
21 
22 #define EFIKA_PLATFORM_NAME "Efika"
23 
24 
25 /* ------------------------------------------------------------------------ */
26 /* PCI accesses thru RTAS                                                   */
27 /* ------------------------------------------------------------------------ */
28 
29 #ifdef CONFIG_PCI
30 
31 /*
32  * Access functions for PCI config space using RTAS calls.
33  */
34 static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
35 			    int len, u32 * val)
36 {
37 	struct pci_controller *hose = pci_bus_to_host(bus);
38 	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
39 	    | (((bus->number - hose->first_busno) & 0xff) << 16)
40 	    | (hose->global_number << 24);
41 	int ret = -1;
42 	int rval;
43 
44 	rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
45 	*val = ret;
46 	return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
47 }
48 
49 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
50 			     int offset, int len, u32 val)
51 {
52 	struct pci_controller *hose = pci_bus_to_host(bus);
53 	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
54 	    | (((bus->number - hose->first_busno) & 0xff) << 16)
55 	    | (hose->global_number << 24);
56 	int rval;
57 
58 	rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
59 			 addr, len, val);
60 	return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
61 }
62 
63 static struct pci_ops rtas_pci_ops = {
64 	.read = rtas_read_config,
65 	.write = rtas_write_config,
66 };
67 
68 
69 static void __init efika_pcisetup(void)
70 {
71 	const int *bus_range;
72 	int len;
73 	struct pci_controller *hose;
74 	struct device_node *root;
75 	struct device_node *pcictrl;
76 
77 	root = of_find_node_by_path("/");
78 	if (root == NULL) {
79 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
80 		       ": Unable to find the root node\n");
81 		return;
82 	}
83 
84 	for_each_child_of_node(root, pcictrl)
85 		if (of_node_name_eq(pcictrl, "pci"))
86 			break;
87 
88 	of_node_put(root);
89 
90 	if (pcictrl == NULL) {
91 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
92 		       ": Unable to find the PCI bridge node\n");
93 		return;
94 	}
95 
96 	bus_range = of_get_property(pcictrl, "bus-range", &len);
97 	if (bus_range == NULL || len < 2 * sizeof(int)) {
98 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
99 		       ": Can't get bus-range for %pOF\n", pcictrl);
100 		goto out_put;
101 	}
102 
103 	if (bus_range[1] == bus_range[0])
104 		printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
105 		       bus_range[0]);
106 	else
107 		printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
108 		       bus_range[0], bus_range[1]);
109 	printk(" controlled by %pOF\n", pcictrl);
110 	printk("\n");
111 
112 	hose = pcibios_alloc_controller(pcictrl);
113 	if (!hose) {
114 		printk(KERN_WARNING EFIKA_PLATFORM_NAME
115 		       ": Can't allocate PCI controller structure for %pOF\n",
116 		       pcictrl);
117 		goto out_put;
118 	}
119 
120 	hose->first_busno = bus_range[0];
121 	hose->last_busno = bus_range[1];
122 	hose->ops = &rtas_pci_ops;
123 
124 	pci_process_bridge_OF_ranges(hose, pcictrl, 0);
125 	return;
126 out_put:
127 	of_node_put(pcictrl);
128 }
129 
130 #else
131 static void __init efika_pcisetup(void)
132 {}
133 #endif
134 
135 
136 
137 /* ------------------------------------------------------------------------ */
138 /* Platform setup                                                           */
139 /* ------------------------------------------------------------------------ */
140 
141 static void efika_show_cpuinfo(struct seq_file *m)
142 {
143 	struct device_node *root;
144 	const char *revision;
145 	const char *codegendescription;
146 	const char *codegenvendor;
147 
148 	root = of_find_node_by_path("/");
149 	if (!root)
150 		return;
151 
152 	revision = of_get_property(root, "revision", NULL);
153 	codegendescription = of_get_property(root, "CODEGEN,description", NULL);
154 	codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL);
155 
156 	if (codegendescription)
157 		seq_printf(m, "machine\t\t: %s\n", codegendescription);
158 	else
159 		seq_printf(m, "machine\t\t: Efika\n");
160 
161 	if (revision)
162 		seq_printf(m, "revision\t: %s\n", revision);
163 
164 	if (codegenvendor)
165 		seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
166 
167 	of_node_put(root);
168 }
169 
170 #ifdef CONFIG_PM
171 static void efika_suspend_prepare(void __iomem *mbar)
172 {
173 	u8 pin = 4;	/* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
174 	u8 level = 1;	/* wakeup on high level */
175 	/* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
176 	mpc52xx_set_wakeup_gpio(pin, level);
177 }
178 #endif
179 
180 static void __init efika_setup_arch(void)
181 {
182 	rtas_initialize();
183 
184 	/* Map important registers from the internal memory map */
185 	mpc52xx_map_common_devices();
186 
187 #ifdef CONFIG_PM
188 	mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
189 	mpc52xx_pm_init();
190 #endif
191 
192 	if (ppc_md.progress)
193 		ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
194 }
195 
196 static int __init efika_probe(void)
197 {
198 	const char *model = of_get_property(of_root, "model", NULL);
199 
200 	if (model == NULL)
201 		return 0;
202 	if (strcmp(model, "EFIKA5K2"))
203 		return 0;
204 
205 	DMA_MODE_READ = 0x44;
206 	DMA_MODE_WRITE = 0x48;
207 
208 	pm_power_off = rtas_power_off;
209 
210 	return 1;
211 }
212 
213 define_machine(efika)
214 {
215 	.name			= EFIKA_PLATFORM_NAME,
216 	.probe			= efika_probe,
217 	.setup_arch		= efika_setup_arch,
218 	.discover_phbs		= efika_pcisetup,
219 	.init			= mpc52xx_declare_of_platform_devices,
220 	.show_cpuinfo		= efika_show_cpuinfo,
221 	.init_IRQ		= mpc52xx_init_irq,
222 	.get_irq		= mpc52xx_get_irq,
223 	.restart		= rtas_restart,
224 	.halt			= rtas_halt,
225 	.set_rtc_time		= rtas_set_rtc_time,
226 	.get_rtc_time		= rtas_get_rtc_time,
227 	.progress		= rtas_progress,
228 	.get_boot_time		= rtas_get_boot_time,
229 	.calibrate_decr		= generic_calibrate_decr,
230 #ifdef CONFIG_PCI
231 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
232 #endif
233 };
234 
235