Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / arch / powerpc / platforms / chrp / pci.c
1 /*
2  * CHRP pci routines.
3  */
4
5 #include <linux/kernel.h>
6 #include <linux/pci.h>
7 #include <linux/delay.h>
8 #include <linux/string.h>
9 #include <linux/init.h>
10
11 #include <asm/io.h>
12 #include <asm/pgtable.h>
13 #include <asm/irq.h>
14 #include <asm/hydra.h>
15 #include <asm/prom.h>
16 #include <asm/gg2.h>
17 #include <asm/machdep.h>
18 #include <asm/sections.h>
19 #include <asm/pci-bridge.h>
20 #include <asm/grackle.h>
21 #include <asm/rtas.h>
22
23 #include "chrp.h"
24
25 /* LongTrail */
26 void __iomem *gg2_pci_config_base;
27
28 /*
29  * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
30  * limit the bus number to 3 bits
31  */
32
33 int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
34                            int len, u32 *val)
35 {
36         volatile void __iomem *cfg_data;
37         struct pci_controller *hose = bus->sysdata;
38
39         if (bus->number > 7)
40                 return PCIBIOS_DEVICE_NOT_FOUND;
41         /*
42          * Note: the caller has already checked that off is
43          * suitably aligned and that len is 1, 2 or 4.
44          */
45         cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
46         switch (len) {
47         case 1:
48                 *val =  in_8(cfg_data);
49                 break;
50         case 2:
51                 *val = in_le16(cfg_data);
52                 break;
53         default:
54                 *val = in_le32(cfg_data);
55                 break;
56         }
57         return PCIBIOS_SUCCESSFUL;
58 }
59
60 int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
61                             int len, u32 val)
62 {
63         volatile void __iomem *cfg_data;
64         struct pci_controller *hose = bus->sysdata;
65
66         if (bus->number > 7)
67                 return PCIBIOS_DEVICE_NOT_FOUND;
68         /*
69          * Note: the caller has already checked that off is
70          * suitably aligned and that len is 1, 2 or 4.
71          */
72         cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
73         switch (len) {
74         case 1:
75                 out_8(cfg_data, val);
76                 break;
77         case 2:
78                 out_le16(cfg_data, val);
79                 break;
80         default:
81                 out_le32(cfg_data, val);
82                 break;
83         }
84         return PCIBIOS_SUCCESSFUL;
85 }
86
87 static struct pci_ops gg2_pci_ops =
88 {
89         gg2_read_config,
90         gg2_write_config
91 };
92
93 /*
94  * Access functions for PCI config space using RTAS calls.
95  */
96 int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
97                      int len, u32 *val)
98 {
99         struct pci_controller *hose = bus->sysdata;
100         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
101                 | (((bus->number - hose->first_busno) & 0xff) << 16)
102                 | (hose->global_number << 24);
103         int ret = -1;
104         int rval;
105
106         rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
107         *val = ret;
108         return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
109 }
110
111 int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
112                       int len, u32 val)
113 {
114         struct pci_controller *hose = bus->sysdata;
115         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
116                 | (((bus->number - hose->first_busno) & 0xff) << 16)
117                 | (hose->global_number << 24);
118         int rval;
119
120         rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
121                          addr, len, val);
122         return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
123 }
124
125 static struct pci_ops rtas_pci_ops =
126 {
127         rtas_read_config,
128         rtas_write_config
129 };
130
131 volatile struct Hydra __iomem *Hydra = NULL;
132
133 int __init
134 hydra_init(void)
135 {
136         struct device_node *np;
137         struct resource r;
138
139         np = of_find_node_by_name(NULL, "mac-io");
140         if (np == NULL || of_address_to_resource(np, 0, &r)) {
141                 of_node_put(np);
142                 return 0;
143         }
144         Hydra = ioremap(r.start, r.end-r.start);
145         printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
146         printk("Hydra Feature_Control was %x",
147                in_le32(&Hydra->Feature_Control));
148         out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
149                                            HYDRA_FC_SCSI_CELL_EN |
150                                            HYDRA_FC_SCCA_ENABLE |
151                                            HYDRA_FC_SCCB_ENABLE |
152                                            HYDRA_FC_ARB_BYPASS |
153                                            HYDRA_FC_MPIC_ENABLE |
154                                            HYDRA_FC_SLOW_SCC_PCLK |
155                                            HYDRA_FC_MPIC_IS_MASTER));
156         printk(", now %x\n", in_le32(&Hydra->Feature_Control));
157         return 1;
158 }
159
160 #define PRG_CL_RESET_VALID 0x00010000
161
162 static void __init
163 setup_python(struct pci_controller *hose, struct device_node *dev)
164 {
165         u32 __iomem *reg;
166         u32 val;
167         struct resource r;
168
169         if (of_address_to_resource(dev, 0, &r)) {
170                 printk(KERN_ERR "No address for Python PCI controller\n");
171                 return;
172         }
173
174         /* Clear the magic go-slow bit */
175         reg = ioremap(r.start + 0xf6000, 0x40);
176         BUG_ON(!reg); 
177         val = in_be32(&reg[12]);
178         if (val & PRG_CL_RESET_VALID) {
179                 out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
180                 in_be32(&reg[12]);
181         }
182         iounmap(reg);
183
184         setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010);
185 }
186
187 /* Marvell Discovery II based Pegasos 2 */
188 static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
189 {
190         struct device_node *root = of_find_node_by_path("/");
191         struct device_node *rtas;
192
193         rtas = of_find_node_by_name (root, "rtas");
194         if (rtas) {
195                 hose->ops = &rtas_pci_ops;
196                 of_node_put(rtas);
197         } else {
198                 printk ("RTAS supporting Pegasos OF not found, please upgrade"
199                         " your firmware\n");
200         }
201         pci_assign_all_buses = 1;
202         /* keep the reference to the root node */
203 }
204
205 void __init
206 chrp_find_bridges(void)
207 {
208         struct device_node *dev;
209         const int *bus_range;
210         int len, index = -1;
211         struct pci_controller *hose;
212         const unsigned int *dma;
213         const char *model, *machine;
214         int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
215         struct device_node *root = of_find_node_by_path("/");
216         struct resource r;
217         /*
218          * The PCI host bridge nodes on some machines don't have
219          * properties to adequately identify them, so we have to
220          * look at what sort of machine this is as well.
221          */
222         machine = of_get_property(root, "model", NULL);
223         if (machine != NULL) {
224                 is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
225                 is_mot = strncmp(machine, "MOT", 3) == 0;
226                 if (strncmp(machine, "Pegasos2", 8) == 0)
227                         is_pegasos = 2;
228                 else if (strncmp(machine, "Pegasos", 7) == 0)
229                         is_pegasos = 1;
230         }
231         for (dev = root->child; dev != NULL; dev = dev->sibling) {
232                 if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
233                         continue;
234                 ++index;
235                 /* The GG2 bridge on the LongTrail doesn't have an address */
236                 if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
237                         printk(KERN_WARNING "Can't use %s: no address\n",
238                                dev->full_name);
239                         continue;
240                 }
241                 bus_range = of_get_property(dev, "bus-range", &len);
242                 if (bus_range == NULL || len < 2 * sizeof(int)) {
243                         printk(KERN_WARNING "Can't get bus-range for %s\n",
244                                 dev->full_name);
245                         continue;
246                 }
247                 if (bus_range[1] == bus_range[0])
248                         printk(KERN_INFO "PCI bus %d", bus_range[0]);
249                 else
250                         printk(KERN_INFO "PCI buses %d..%d",
251                                bus_range[0], bus_range[1]);
252                 printk(" controlled by %s", dev->full_name);
253                 if (!is_longtrail)
254                         printk(" at %llx", (unsigned long long)r.start);
255                 printk("\n");
256
257                 hose = pcibios_alloc_controller(dev);
258                 if (!hose) {
259                         printk("Can't allocate PCI controller structure for %s\n",
260                                 dev->full_name);
261                         continue;
262                 }
263                 hose->first_busno = bus_range[0];
264                 hose->last_busno = bus_range[1];
265
266                 model = of_get_property(dev, "model", NULL);
267                 if (model == NULL)
268                         model = "<none>";
269                 if (of_device_is_compatible(dev, "IBM,python")) {
270                         setup_python(hose, dev);
271                 } else if (is_mot
272                            || strncmp(model, "Motorola, Grackle", 17) == 0) {
273                         setup_grackle(hose);
274                 } else if (is_longtrail) {
275                         void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
276                         hose->ops = &gg2_pci_ops;
277                         hose->cfg_data = p;
278                         gg2_pci_config_base = p;
279                 } else if (is_pegasos == 1) {
280                         setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
281                 } else if (is_pegasos == 2) {
282                         setup_peg2(hose, dev);
283                 } else if (!strncmp(model, "IBM,CPC710", 10)) {
284                         setup_indirect_pci(hose,
285                                            r.start + 0x000f8000,
286                                            r.start + 0x000f8010);
287                         if (index == 0) {
288                                 dma = of_get_property(dev, "system-dma-base",
289                                                         &len);
290                                 if (dma && len >= sizeof(*dma)) {
291                                         dma = (unsigned int *)
292                                                 (((unsigned long)dma) +
293                                                 len - sizeof(*dma));
294                                                 pci_dram_offset = *dma;
295                                 }
296                         }
297                 } else {
298                         printk("No methods for %s (model %s), using RTAS\n",
299                                dev->full_name, model);
300                         hose->ops = &rtas_pci_ops;
301                 }
302
303                 pci_process_bridge_OF_ranges(hose, dev, index == 0);
304
305                 /* check the first bridge for a property that we can
306                    use to set pci_dram_offset */
307                 dma = of_get_property(dev, "ibm,dma-ranges", &len);
308                 if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
309                         pci_dram_offset = dma[2] - dma[3];
310                         printk("pci_dram_offset = %lx\n", pci_dram_offset);
311                 }
312         }
313         of_node_put(root);
314 }
315
316 /* SL82C105 IDE Control/Status Register */
317 #define SL82C105_IDECSR                0x40
318
319 /* Fixup for Winbond ATA quirk, required for briq */
320 void chrp_pci_fixup_winbond_ata(struct pci_dev *sl82c105)
321 {
322         u8 progif;
323
324         /* If non-briq machines need that fixup too, please speak up */
325         if (!machine_is(chrp) || _chrp_type != _CHRP_briq)
326                 return;
327
328         if ((sl82c105->class & 5) != 5) {
329                 printk("W83C553: Switching SL82C105 IDE to PCI native mode\n");
330                 /* Enable SL82C105 PCI native IDE mode */
331                 pci_read_config_byte(sl82c105, PCI_CLASS_PROG, &progif);
332                 pci_write_config_byte(sl82c105, PCI_CLASS_PROG, progif | 0x05);
333                 sl82c105->class |= 0x05;
334                 /* Disable SL82C105 second port */
335                 pci_write_config_word(sl82c105, SL82C105_IDECSR, 0x0003);
336         }
337 }
338 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
339                 chrp_pci_fixup_winbond_ata);