/arch/powerpc/platforms/52xx/efika.c

  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_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;
127out_put:
128	of_node_put(pcictrl);
129}
130
131#else
132static void __init efika_pcisetup(void)
133{}
134#endif
135
136
137
138/* ------------------------------------------------------------------------ */
139/* Platform setup                                                           */
140/* ------------------------------------------------------------------------ */
141
142static 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
172static 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
181static 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
199static 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	DMA_MODE_READ = 0x44;
209	DMA_MODE_WRITE = 0x48;
210
211	pm_power_off = rtas_power_off;
212
213	return 1;
214}
215
216define_machine(efika)
217{
218	.name			= EFIKA_PLATFORM_NAME,
219	.probe			= efika_probe,
220	.setup_arch		= efika_setup_arch,
221	.init			= mpc52xx_declare_of_platform_devices,
222	.show_cpuinfo		= efika_show_cpuinfo,
223	.init_IRQ		= mpc52xx_init_irq,
224	.get_irq		= mpc52xx_get_irq,
225	.restart		= rtas_restart,
226	.halt			= rtas_halt,
227	.set_rtc_time		= rtas_set_rtc_time,
228	.get_rtc_time		= rtas_get_rtc_time,
229	.progress		= rtas_progress,
230	.get_boot_time		= rtas_get_boot_time,
231	.calibrate_decr		= generic_calibrate_decr,
232#ifdef CONFIG_PCI
233	.phys_mem_access_prot	= pci_phys_mem_access_prot,
234#endif
235};
236