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 */
35static 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
50static 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
64static struct pci_ops rtas_pci_ops = {
65	.read = rtas_read_config,
66	.write = rtas_write_config,
67};
68
69
70static 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 %s\n", pcictrl->full_name);
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 %s\n", pcictrl->full_name);
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 %s\n",
119		       pcictrl->full_name);
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;
129out_put:
130	of_node_put(pcictrl);
131}
132
133#else
134static void __init efika_pcisetup(void)
135{}
136#endif
137
138
139
140/* ------------------------------------------------------------------------ */
141/* Platform setup                                                           */
142/* ------------------------------------------------------------------------ */
143
144static 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
174static 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
183static 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
201static int __init efika_probe(void)
202{
203	const char *model = of_get_flat_dt_prop(of_get_flat_dt_root(),
204						"model", NULL);
205
206	if (model == NULL)
207		return 0;
208	if (strcmp(model, "EFIKA5K2"))
209		return 0;
210
211	ISA_DMA_THRESHOLD = ~0L;
212	DMA_MODE_READ = 0x44;
213	DMA_MODE_WRITE = 0x48;
214
215	pm_power_off = rtas_power_off;
216
217	return 1;
218}
219
220define_machine(efika)
221{
222	.name			= EFIKA_PLATFORM_NAME,
223	.probe			= efika_probe,
224	.setup_arch		= efika_setup_arch,
225	.init			= mpc52xx_declare_of_platform_devices,
226	.show_cpuinfo		= efika_show_cpuinfo,
227	.init_IRQ		= mpc52xx_init_irq,
228	.get_irq		= mpc52xx_get_irq,
229	.restart		= rtas_restart,
230	.halt			= rtas_halt,
231	.set_rtc_time		= rtas_set_rtc_time,
232	.get_rtc_time		= rtas_get_rtc_time,
233	.progress		= rtas_progress,
234	.get_boot_time		= rtas_get_boot_time,
235	.calibrate_decr		= generic_calibrate_decr,
236#ifdef CONFIG_PCI
237	.phys_mem_access_prot	= pci_phys_mem_access_prot,
238#endif
239};
240
241