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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/prom.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 (pcictrl = NULL;;) {
 85                 pcictrl = of_get_next_child(root, pcictrl);
 86                 if ((pcictrl == NULL) || (strcmp(pcictrl->name, "pci") == 0))
 87                         break;
 88         }
 89 
 90         of_node_put(root);
 91 
 92         if (pcictrl == NULL) {
 93                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
 94                        ": Unable to find the PCI bridge node\n");
 95                 return;
 96         }
 97 
 98         bus_range = of_get_property(pcictrl, "bus-range", &len);
 99         if (bus_range == NULL || len < 2 * sizeof(int)) {
100                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
101                        ": Can't get bus-range for %s\n", pcictrl->full_name);
102                 goto out_put;
103         }
104 
105         if (bus_range[1] == bus_range[0])
106                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d",
107                        bus_range[0]);
108         else
109                 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d",
110                        bus_range[0], bus_range[1]);
111         printk(" controlled by %s\n", pcictrl->full_name);
112         printk("\n");
113 
114         hose = pcibios_alloc_controller(pcictrl);
115         if (!hose) {
116                 printk(KERN_WARNING EFIKA_PLATFORM_NAME
117                        ": Can't allocate PCI controller structure for %s\n",
118                        pcictrl->full_name);
119                 goto out_put;
120         }
121 
122         hose->first_busno = bus_range[0];
123         hose->last_busno = bus_range[1];
124         hose->ops = &rtas_pci_ops;
125 
126         pci_process_bridge_OF_ranges(hose, pcictrl, 0);
127         return;
128 out_put:
129         of_node_put(pcictrl);
130 }
131 
132 #else
133 static void __init efika_pcisetup(void)
134 {}
135 #endif
136 
137 
138 
139 /* ------------------------------------------------------------------------ */
140 /* Platform setup                                                           */
141 /* ------------------------------------------------------------------------ */
142 
143 static void efika_show_cpuinfo(struct seq_file *m)
144 {
145         struct device_node *root;
146         const char *revision;
147         const char *codegendescription;
148         const char *codegenvendor;
149 
150         root = of_find_node_by_path("/");
151         if (!root)
152                 return;
153 
154         revision = of_get_property(root, "revision", NULL);
155         codegendescription = of_get_property(root, "CODEGEN,description", NULL);
156         codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL);
157 
158         if (codegendescription)
159                 seq_printf(m, "machine\t\t: %s\n", codegendescription);
160         else
161                 seq_printf(m, "machine\t\t: Efika\n");
162 
163         if (revision)
164                 seq_printf(m, "revision\t: %s\n", revision);
165 
166         if (codegenvendor)
167                 seq_printf(m, "vendor\t\t: %s\n", codegenvendor);
168 
169         of_node_put(root);
170 }
171 
172 #ifdef CONFIG_PM
173 static void efika_suspend_prepare(void __iomem *mbar)
174 {
175         u8 pin = 4;     /* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
176         u8 level = 1;   /* wakeup on high level */
177         /* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
178         mpc52xx_set_wakeup_gpio(pin, level);
179 }
180 #endif
181 
182 static void __init efika_setup_arch(void)
183 {
184         rtas_initialize();
185 
186         /* Map important registers from the internal memory map */
187         mpc52xx_map_common_devices();
188 
189         efika_pcisetup();
190 
191 #ifdef CONFIG_PM
192         mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
193         mpc52xx_pm_init();
194 #endif
195 
196         if (ppc_md.progress)
197                 ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
198 }
199 
200 static int __init efika_probe(void)
201 {
202         char *model = of_get_flat_dt_prop(of_get_flat_dt_root(),
203                                           "model", NULL);
204 
205         if (model == NULL)
206                 return 0;
207         if (strcmp(model, "EFIKA5K2"))
208                 return 0;
209 
210         ISA_DMA_THRESHOLD = ~0L;
211         DMA_MODE_READ = 0x44;
212         DMA_MODE_WRITE = 0x48;
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         .power_off              = rtas_power_off,
228         .halt                   = rtas_halt,
229         .set_rtc_time           = rtas_set_rtc_time,
230         .get_rtc_time           = rtas_get_rtc_time,
231         .progress               = rtas_progress,
232         .get_boot_time          = rtas_get_boot_time,
233         .calibrate_decr         = generic_calibrate_decr,
234 #ifdef CONFIG_PCI
235         .phys_mem_access_prot   = pci_phys_mem_access_prot,
236 #endif
237 };
238 
239 

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