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/bootinfo.h>
39 #include <asm/pci-bridge.h>
40 #include <asm/mpc85xx.h>
42 #include <mm/mmu_decl.h>
46 #include <asm/i8259.h>
48 #include <sysdev/fsl_soc.h>
49 #include <sysdev/fsl_pci.h>
52 static int cds_pci_slot = 2;
53 static volatile u8 *cadmus;
57 #define ARCADIA_HOST_BRIDGE_IDSEL 17
58 #define ARCADIA_2ND_BRIDGE_IDSEL 3
60 static int mpc85xx_exclude_device(struct pci_controller *hose,
61 u_char bus, u_char devfn)
63 /* We explicitly do not go past the Tundra 320 Bridge */
64 if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
65 return PCIBIOS_DEVICE_NOT_FOUND;
66 if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
67 return PCIBIOS_DEVICE_NOT_FOUND;
69 return PCIBIOS_SUCCESSFUL;
72 static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
75 if (dev->vendor == PCI_VENDOR_ID_VIA) {
76 switch (dev->device) {
77 case PCI_DEVICE_ID_VIA_82C586_1:
79 * U-Boot does not set the enable bits
80 * for the IDE device. Force them on here.
82 pci_read_config_byte(dev, 0x40, &c);
83 c |= 0x03; /* IDE: Chip Enable Bits */
84 pci_write_config_byte(dev, 0x40, c);
87 * Since only primary interface works, force the
88 * IDE function to standard primary IDE interrupt
92 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
95 * Force legacy USB interrupt routing
97 case PCI_DEVICE_ID_VIA_82C586_2:
98 /* There are two USB controllers.
99 * Identify them by functon number
101 if (PCI_FUNC(dev->devfn))
105 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
112 static void __devinit skip_fake_bridge(struct pci_dev *dev)
114 /* Make it an error to skip the fake bridge
115 * in pci_setup_device() in probe.c */
116 dev->hdr_type = 0x7f;
118 DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
119 DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
120 DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);
122 #ifdef CONFIG_PPC_I8259
123 static void mpc85xx_8259_cascade_handler(unsigned int irq,
124 struct irq_desc *desc)
126 unsigned int cascade_irq = i8259_irq();
128 if (cascade_irq != NO_IRQ)
129 /* handle an interrupt from the 8259 */
130 generic_handle_irq(cascade_irq);
132 /* check for any interrupts from the shared IRQ line */
133 handle_fasteoi_irq(irq, desc);
136 static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
141 static struct irqaction mpc85xxcds_8259_irqaction = {
142 .handler = mpc85xx_8259_cascade_action,
143 .flags = IRQF_SHARED,
144 .mask = CPU_MASK_NONE,
145 .name = "8259 cascade",
147 #endif /* PPC_I8259 */
148 #endif /* CONFIG_PCI */
150 static void __init mpc85xx_cds_pic_init(void)
154 struct device_node *np = NULL;
155 #if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
156 struct device_node *cascade_node = NULL;
160 np = of_find_node_by_type(np, "open-pic");
163 printk(KERN_ERR "Could not find open-pic node\n");
167 if (of_address_to_resource(np, 0, &r)) {
168 printk(KERN_ERR "Failed to map mpic register space\n");
173 mpic = mpic_alloc(np, r.start,
174 MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
175 0, 256, " OpenPIC ");
176 BUG_ON(mpic == NULL);
178 /* Return the mpic node */
183 #if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
184 /* Initialize the i8259 controller */
185 for_each_node_by_type(np, "interrupt-controller")
186 if (of_device_is_compatible(np, "chrp,iic")) {
191 if (cascade_node == NULL) {
192 printk(KERN_DEBUG "Could not find i8259 PIC\n");
196 cascade_irq = irq_of_parse_and_map(cascade_node, 0);
197 if (cascade_irq == NO_IRQ) {
198 printk(KERN_ERR "Failed to map cascade interrupt\n");
202 i8259_init(cascade_node, 0);
203 of_node_put(cascade_node);
206 * Hook the interrupt to make sure desc->action is never NULL.
207 * This is required to ensure that the interrupt does not get
208 * disabled when the last user of the shared IRQ line frees their
211 if (setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))
212 printk(KERN_ERR "Failed to setup cascade interrupt\n");
214 /* Success. Connect our low-level cascade handler. */
215 set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);
216 #endif /* CONFIG_PPC_I8259 */
220 * Setup the architecture
222 static void __init mpc85xx_cds_setup_arch(void)
224 struct device_node *cpu;
226 struct device_node *np;
230 ppc_md.progress("mpc85xx_cds_setup_arch()", 0);
232 cpu = of_find_node_by_type(NULL, "cpu");
234 const unsigned int *fp;
236 fp = of_get_property(cpu, "clock-frequency", NULL);
238 loops_per_jiffy = *fp / HZ;
240 loops_per_jiffy = 500000000 / HZ;
244 cadmus = ioremap(CADMUS_BASE, CADMUS_SIZE);
245 cds_pci_slot = ((cadmus[CM_CSR] >> 6) & 0x3) + 1;
247 if (ppc_md.progress) {
249 snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
250 cadmus[CM_VER], cds_pci_slot);
251 ppc_md.progress(buf, 0);
255 for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;) {
256 struct resource rsrc;
257 of_address_to_resource(np, 0, &rsrc);
258 if ((rsrc.start & 0xfffff) == 0x9000)
259 fsl_add_bridge(np, 0);
261 fsl_add_bridge(np, 1);
263 ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
264 ppc_md.pci_exclude_device = mpc85xx_exclude_device;
268 static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
270 uint pvid, svid, phid1;
271 uint memsize = total_memory;
273 pvid = mfspr(SPRN_PVR);
274 svid = mfspr(SPRN_SVR);
276 seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
277 seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n", cadmus[CM_VER]);
278 seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
279 seq_printf(m, "SVR\t\t: 0x%x\n", svid);
281 /* Display cpu Pll setting */
282 phid1 = mfspr(SPRN_HID1);
283 seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
285 /* Display the amount of memory */
286 seq_printf(m, "Memory\t\t: %d MB\n", memsize / (1024 * 1024));
291 * Called very early, device-tree isn't unflattened
293 static int __init mpc85xx_cds_probe(void)
295 unsigned long root = of_get_flat_dt_root();
297 return of_flat_dt_is_compatible(root, "MPC85xxCDS");
300 define_machine(mpc85xx_cds) {
301 .name = "MPC85xx CDS",
302 .probe = mpc85xx_cds_probe,
303 .setup_arch = mpc85xx_cds_setup_arch,
304 .init_IRQ = mpc85xx_cds_pic_init,
305 .show_cpuinfo = mpc85xx_cds_show_cpuinfo,
306 .get_irq = mpic_get_irq,
307 .restart = mpc85xx_restart,
308 .calibrate_decr = generic_calibrate_decr,
309 .progress = udbg_progress,
310 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,