5 #include <linux/kernel.h>
7 #include <linux/delay.h>
8 #include <linux/string.h>
9 #include <linux/init.h>
10 #include <linux/ide.h>
13 #include <asm/pgtable.h>
15 #include <asm/hydra.h>
18 #include <asm/machdep.h>
19 #include <asm/sections.h>
20 #include <asm/pci-bridge.h>
21 #include <asm/grackle.h>
27 void __iomem *gg2_pci_config_base;
30 * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
31 * limit the bus number to 3 bits
34 int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
37 volatile void __iomem *cfg_data;
38 struct pci_controller *hose = bus->sysdata;
41 return PCIBIOS_DEVICE_NOT_FOUND;
43 * Note: the caller has already checked that off is
44 * suitably aligned and that len is 1, 2 or 4.
46 cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
49 *val = in_8(cfg_data);
52 *val = in_le16(cfg_data);
55 *val = in_le32(cfg_data);
58 return PCIBIOS_SUCCESSFUL;
61 int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
64 volatile void __iomem *cfg_data;
65 struct pci_controller *hose = bus->sysdata;
68 return PCIBIOS_DEVICE_NOT_FOUND;
70 * Note: the caller has already checked that off is
71 * suitably aligned and that len is 1, 2 or 4.
73 cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
79 out_le16(cfg_data, val);
82 out_le32(cfg_data, val);
85 return PCIBIOS_SUCCESSFUL;
88 static struct pci_ops gg2_pci_ops =
95 * Access functions for PCI config space using RTAS calls.
97 int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
100 struct pci_controller *hose = bus->sysdata;
101 unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
102 | (((bus->number - hose->first_busno) & 0xff) << 16)
103 | (hose->index << 24);
107 rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
109 return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
112 int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
115 struct pci_controller *hose = bus->sysdata;
116 unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
117 | (((bus->number - hose->first_busno) & 0xff) << 16)
118 | (hose->index << 24);
121 rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
123 return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
126 static struct pci_ops rtas_pci_ops =
132 volatile struct Hydra __iomem *Hydra = NULL;
137 struct device_node *np;
140 np = find_devices("mac-io");
141 if (np == NULL || of_address_to_resource(np, 0, &r))
143 Hydra = ioremap(r.start, r.end-r.start);
144 printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
145 printk("Hydra Feature_Control was %x",
146 in_le32(&Hydra->Feature_Control));
147 out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
148 HYDRA_FC_SCSI_CELL_EN |
149 HYDRA_FC_SCCA_ENABLE |
150 HYDRA_FC_SCCB_ENABLE |
151 HYDRA_FC_ARB_BYPASS |
152 HYDRA_FC_MPIC_ENABLE |
153 HYDRA_FC_SLOW_SCC_PCLK |
154 HYDRA_FC_MPIC_IS_MASTER));
155 printk(", now %x\n", in_le32(&Hydra->Feature_Control));
160 chrp_pcibios_fixup(void)
162 struct pci_dev *dev = NULL;
164 for_each_pci_dev(dev)
165 pci_read_irq_line(dev);
168 #define PRG_CL_RESET_VALID 0x00010000
171 setup_python(struct pci_controller *hose, struct device_node *dev)
177 if (of_address_to_resource(dev, 0, &r)) {
178 printk(KERN_ERR "No address for Python PCI controller\n");
182 /* Clear the magic go-slow bit */
183 reg = ioremap(r.start + 0xf6000, 0x40);
185 val = in_be32(®[12]);
186 if (val & PRG_CL_RESET_VALID) {
187 out_be32(®[12], val & ~PRG_CL_RESET_VALID);
192 setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010);
195 /* Marvell Discovery II based Pegasos 2 */
196 static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
198 struct device_node *root = find_path_device("/");
199 struct device_node *rtas;
202 rtas = of_find_node_by_name (root, "rtas");
204 hose->ops = &rtas_pci_ops;
207 printk ("RTAS supporting Pegasos OF not found, please upgrade"
210 pci_assign_all_buses = 1;
214 chrp_find_bridges(void)
216 struct device_node *dev;
219 struct pci_controller *hose;
221 char *model, *machine;
222 int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
223 struct device_node *root = find_path_device("/");
226 * The PCI host bridge nodes on some machines don't have
227 * properties to adequately identify them, so we have to
228 * look at what sort of machine this is as well.
230 machine = get_property(root, "model", NULL);
231 if (machine != NULL) {
232 is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
233 is_mot = strncmp(machine, "MOT", 3) == 0;
234 if (strncmp(machine, "Pegasos2", 8) == 0)
236 else if (strncmp(machine, "Pegasos", 7) == 0)
239 for (dev = root->child; dev != NULL; dev = dev->sibling) {
240 if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
243 /* The GG2 bridge on the LongTrail doesn't have an address */
244 if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
245 printk(KERN_WARNING "Can't use %s: no address\n",
249 bus_range = (int *) get_property(dev, "bus-range", &len);
250 if (bus_range == NULL || len < 2 * sizeof(int)) {
251 printk(KERN_WARNING "Can't get bus-range for %s\n",
255 if (bus_range[1] == bus_range[0])
256 printk(KERN_INFO "PCI bus %d", bus_range[0]);
258 printk(KERN_INFO "PCI buses %d..%d",
259 bus_range[0], bus_range[1]);
260 printk(" controlled by %s", dev->type);
262 printk(" at %llx", (unsigned long long)r.start);
265 hose = pcibios_alloc_controller();
267 printk("Can't allocate PCI controller structure for %s\n",
271 hose->arch_data = dev;
272 hose->first_busno = bus_range[0];
273 hose->last_busno = bus_range[1];
275 model = get_property(dev, "model", NULL);
278 if (device_is_compatible(dev, "IBM,python")) {
279 setup_python(hose, dev);
281 || strncmp(model, "Motorola, Grackle", 17) == 0) {
283 } else if (is_longtrail) {
284 void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
285 hose->ops = &gg2_pci_ops;
287 gg2_pci_config_base = p;
288 } else if (is_pegasos == 1) {
289 setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
290 } else if (is_pegasos == 2) {
291 setup_peg2(hose, dev);
293 printk("No methods for %s (model %s), using RTAS\n",
294 dev->full_name, model);
295 hose->ops = &rtas_pci_ops;
298 pci_process_bridge_OF_ranges(hose, dev, index == 0);
300 /* check the first bridge for a property that we can
301 use to set pci_dram_offset */
302 dma = (unsigned int *)
303 get_property(dev, "ibm,dma-ranges", &len);
304 if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
305 pci_dram_offset = dma[2] - dma[3];
306 printk("pci_dram_offset = %lx\n", pci_dram_offset);
310 /* Do not fixup interrupts from OF tree on pegasos */
312 ppc_md.pcibios_fixup = NULL;