2 * MPC85xx setup and early boot code plus other random bits.
4 * Maintained by Kumar Gala (see MAINTAINERS for contact information)
6 * Copyright 2005 Freescale Semiconductor Inc.
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 #include <linux/reboot.h>
19 #include <linux/pci.h>
20 #include <linux/kdev_t.h>
21 #include <linux/major.h>
22 #include <linux/console.h>
23 #include <linux/delay.h>
24 #include <linux/seq_file.h>
25 #include <linux/initrd.h>
26 #include <linux/module.h>
27 #include <linux/interrupt.h>
28 #include <linux/fsl_devices.h>
30 #include <asm/system.h>
31 #include <asm/pgtable.h>
33 #include <asm/atomic.h>
36 #include <asm/machdep.h>
38 #include <asm/pci-bridge.h>
40 #include <mm/mmu_decl.h>
44 #include <asm/i8259.h>
46 #include <sysdev/fsl_soc.h>
47 #include <sysdev/fsl_pci.h>
50 /* xxx - galak, move into device tree */
51 #define CADMUS_BASE (0xf8004000)
52 #define CADMUS_SIZE (256)
58 static int cds_pci_slot = 2;
59 static volatile u8 *cadmus;
63 #define ARCADIA_HOST_BRIDGE_IDSEL 17
64 #define ARCADIA_2ND_BRIDGE_IDSEL 3
66 static int mpc85xx_exclude_device(struct pci_controller *hose,
67 u_char bus, u_char devfn)
69 /* We explicitly do not go past the Tundra 320 Bridge */
70 if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
71 return PCIBIOS_DEVICE_NOT_FOUND;
72 if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
73 return PCIBIOS_DEVICE_NOT_FOUND;
75 return PCIBIOS_SUCCESSFUL;
78 static void mpc85xx_cds_restart(char *cmd)
83 if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
86 /* Use the VIA Super Southbridge to force a PCI reset */
87 pci_read_config_byte(dev, 0x47, &tmp);
88 pci_write_config_byte(dev, 0x47, tmp | 1);
90 /* Flush the outbound PCI write queues */
91 pci_read_config_byte(dev, 0x47, &tmp);
94 * At this point, the harware reset should have triggered.
95 * However, if it doesn't work for some mysterious reason,
96 * just fall through to the default reset below.
103 * If we can't find the VIA chip (maybe the P2P bridge is disabled)
104 * or the VIA chip reset didn't work, just use the default reset.
106 fsl_rstcr_restart(NULL);
109 static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
112 if (dev->vendor == PCI_VENDOR_ID_VIA) {
113 switch (dev->device) {
114 case PCI_DEVICE_ID_VIA_82C586_1:
116 * U-Boot does not set the enable bits
117 * for the IDE device. Force them on here.
119 pci_read_config_byte(dev, 0x40, &c);
120 c |= 0x03; /* IDE: Chip Enable Bits */
121 pci_write_config_byte(dev, 0x40, c);
124 * Since only primary interface works, force the
125 * IDE function to standard primary IDE interrupt
129 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
132 * Force legacy USB interrupt routing
134 case PCI_DEVICE_ID_VIA_82C586_2:
135 /* There are two USB controllers.
136 * Identify them by functon number
138 if (PCI_FUNC(dev->devfn) == 3)
142 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
149 static void __devinit skip_fake_bridge(struct pci_dev *dev)
151 /* Make it an error to skip the fake bridge
152 * in pci_setup_device() in probe.c */
153 dev->hdr_type = 0x7f;
155 DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
156 DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
157 DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);
159 #ifdef CONFIG_PPC_I8259
160 static void mpc85xx_8259_cascade_handler(unsigned int irq,
161 struct irq_desc *desc)
163 unsigned int cascade_irq = i8259_irq();
165 if (cascade_irq != NO_IRQ)
166 /* handle an interrupt from the 8259 */
167 generic_handle_irq(cascade_irq);
169 /* check for any interrupts from the shared IRQ line */
170 handle_fasteoi_irq(irq, desc);
173 static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
178 static struct irqaction mpc85xxcds_8259_irqaction = {
179 .handler = mpc85xx_8259_cascade_action,
180 .flags = IRQF_SHARED,
181 .mask = CPU_MASK_NONE,
182 .name = "8259 cascade",
184 #endif /* PPC_I8259 */
185 #endif /* CONFIG_PCI */
187 static void __init mpc85xx_cds_pic_init(void)
191 struct device_node *np = NULL;
193 np = of_find_node_by_type(np, "open-pic");
196 printk(KERN_ERR "Could not find open-pic node\n");
200 if (of_address_to_resource(np, 0, &r)) {
201 printk(KERN_ERR "Failed to map mpic register space\n");
206 mpic = mpic_alloc(np, r.start,
207 MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
208 0, 256, " OpenPIC ");
209 BUG_ON(mpic == NULL);
211 /* Return the mpic node */
217 #if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
218 static int mpc85xx_cds_8259_attach(void)
221 struct device_node *np = NULL;
222 struct device_node *cascade_node = NULL;
225 /* Initialize the i8259 controller */
226 for_each_node_by_type(np, "interrupt-controller")
227 if (of_device_is_compatible(np, "chrp,iic")) {
232 if (cascade_node == NULL) {
233 printk(KERN_DEBUG "Could not find i8259 PIC\n");
237 cascade_irq = irq_of_parse_and_map(cascade_node, 0);
238 if (cascade_irq == NO_IRQ) {
239 printk(KERN_ERR "Failed to map cascade interrupt\n");
243 i8259_init(cascade_node, 0);
244 of_node_put(cascade_node);
247 * Hook the interrupt to make sure desc->action is never NULL.
248 * This is required to ensure that the interrupt does not get
249 * disabled when the last user of the shared IRQ line frees their
252 if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
253 printk(KERN_ERR "Failed to setup cascade interrupt\n");
257 /* Success. Connect our low-level cascade handler. */
258 set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);
262 machine_device_initcall(mpc85xx_cds, mpc85xx_cds_8259_attach);
264 #endif /* CONFIG_PPC_I8259 */
267 * Setup the architecture
269 static void __init mpc85xx_cds_setup_arch(void)
272 struct device_node *np;
276 ppc_md.progress("mpc85xx_cds_setup_arch()", 0);
278 cadmus = ioremap(CADMUS_BASE, CADMUS_SIZE);
279 cds_pci_slot = ((cadmus[CM_CSR] >> 6) & 0x3) + 1;
281 if (ppc_md.progress) {
283 snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
284 cadmus[CM_VER], cds_pci_slot);
285 ppc_md.progress(buf, 0);
289 for_each_node_by_type(np, "pci") {
290 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
291 of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
292 struct resource rsrc;
293 of_address_to_resource(np, 0, &rsrc);
294 if ((rsrc.start & 0xfffff) == 0x8000)
295 fsl_add_bridge(np, 1);
297 fsl_add_bridge(np, 0);
301 ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
302 ppc_md.pci_exclude_device = mpc85xx_exclude_device;
306 static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
308 uint pvid, svid, phid1;
309 uint memsize = total_memory;
311 pvid = mfspr(SPRN_PVR);
312 svid = mfspr(SPRN_SVR);
314 seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
315 seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n", cadmus[CM_VER]);
316 seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
317 seq_printf(m, "SVR\t\t: 0x%x\n", svid);
319 /* Display cpu Pll setting */
320 phid1 = mfspr(SPRN_HID1);
321 seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
323 /* Display the amount of memory */
324 seq_printf(m, "Memory\t\t: %d MB\n", memsize / (1024 * 1024));
329 * Called very early, device-tree isn't unflattened
331 static int __init mpc85xx_cds_probe(void)
333 unsigned long root = of_get_flat_dt_root();
335 return of_flat_dt_is_compatible(root, "MPC85xxCDS");
338 define_machine(mpc85xx_cds) {
339 .name = "MPC85xx CDS",
340 .probe = mpc85xx_cds_probe,
341 .setup_arch = mpc85xx_cds_setup_arch,
342 .init_IRQ = mpc85xx_cds_pic_init,
343 .show_cpuinfo = mpc85xx_cds_show_cpuinfo,
344 .get_irq = mpic_get_irq,
346 .restart = mpc85xx_cds_restart,
347 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
349 .restart = fsl_rstcr_restart,
351 .calibrate_decr = generic_calibrate_decr,
352 .progress = udbg_progress,