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

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  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 %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;
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_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 
220 define_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 

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