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>
29 #include <linux/of_platform.h>
31 #include <asm/system.h>
32 #include <asm/pgtable.h>
34 #include <asm/atomic.h>
37 #include <asm/machdep.h>
39 #include <asm/pci-bridge.h>
41 #include <mm/mmu_decl.h>
45 #include <asm/i8259.h>
47 #include <sysdev/fsl_soc.h>
48 #include <sysdev/fsl_pci.h>
51 /* xxx - galak, move into device tree */
52 #define CADMUS_BASE (0xf8004000)
53 #define CADMUS_SIZE (256)
59 static int cds_pci_slot = 2;
60 static volatile u8 *cadmus;
64 #define ARCADIA_HOST_BRIDGE_IDSEL 17
65 #define ARCADIA_2ND_BRIDGE_IDSEL 3
67 static int mpc85xx_exclude_device(struct pci_controller *hose,
68 u_char bus, u_char devfn)
70 /* We explicitly do not go past the Tundra 320 Bridge */
71 if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
72 return PCIBIOS_DEVICE_NOT_FOUND;
73 if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
74 return PCIBIOS_DEVICE_NOT_FOUND;
76 return PCIBIOS_SUCCESSFUL;
79 static void mpc85xx_cds_restart(char *cmd)
84 if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
87 /* Use the VIA Super Southbridge to force a PCI reset */
88 pci_read_config_byte(dev, 0x47, &tmp);
89 pci_write_config_byte(dev, 0x47, tmp | 1);
91 /* Flush the outbound PCI write queues */
92 pci_read_config_byte(dev, 0x47, &tmp);
95 * At this point, the harware reset should have triggered.
96 * However, if it doesn't work for some mysterious reason,
97 * just fall through to the default reset below.
104 * If we can't find the VIA chip (maybe the P2P bridge is disabled)
105 * or the VIA chip reset didn't work, just use the default reset.
107 fsl_rstcr_restart(NULL);
110 static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
113 if (dev->vendor == PCI_VENDOR_ID_VIA) {
114 switch (dev->device) {
115 case PCI_DEVICE_ID_VIA_82C586_1:
117 * U-Boot does not set the enable bits
118 * for the IDE device. Force them on here.
120 pci_read_config_byte(dev, 0x40, &c);
121 c |= 0x03; /* IDE: Chip Enable Bits */
122 pci_write_config_byte(dev, 0x40, c);
125 * Since only primary interface works, force the
126 * IDE function to standard primary IDE interrupt
130 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
133 * Force legacy USB interrupt routing
135 case PCI_DEVICE_ID_VIA_82C586_2:
136 /* There are two USB controllers.
137 * Identify them by functon number
139 if (PCI_FUNC(dev->devfn) == 3)
143 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
150 static void __devinit skip_fake_bridge(struct pci_dev *dev)
152 /* Make it an error to skip the fake bridge
153 * in pci_setup_device() in probe.c */
154 dev->hdr_type = 0x7f;
156 DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
157 DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
158 DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);
160 #ifdef CONFIG_PPC_I8259
161 static void mpc85xx_8259_cascade_handler(unsigned int irq,
162 struct irq_desc *desc)
164 unsigned int cascade_irq = i8259_irq();
166 if (cascade_irq != NO_IRQ)
167 /* handle an interrupt from the 8259 */
168 generic_handle_irq(cascade_irq);
170 /* check for any interrupts from the shared IRQ line */
171 handle_fasteoi_irq(irq, desc);
174 static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
179 static struct irqaction mpc85xxcds_8259_irqaction = {
180 .handler = mpc85xx_8259_cascade_action,
181 .flags = IRQF_SHARED,
182 .mask = CPU_MASK_NONE,
183 .name = "8259 cascade",
185 #endif /* PPC_I8259 */
186 #endif /* CONFIG_PCI */
188 static void __init mpc85xx_cds_pic_init(void)
192 struct device_node *np = NULL;
194 np = of_find_node_by_type(np, "open-pic");
197 printk(KERN_ERR "Could not find open-pic node\n");
201 if (of_address_to_resource(np, 0, &r)) {
202 printk(KERN_ERR "Failed to map mpic register space\n");
207 mpic = mpic_alloc(np, r.start,
208 MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
209 0, 256, " OpenPIC ");
210 BUG_ON(mpic == NULL);
212 /* Return the mpic node */
218 #if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
219 static int mpc85xx_cds_8259_attach(void)
222 struct device_node *np = NULL;
223 struct device_node *cascade_node = NULL;
226 /* Initialize the i8259 controller */
227 for_each_node_by_type(np, "interrupt-controller")
228 if (of_device_is_compatible(np, "chrp,iic")) {
233 if (cascade_node == NULL) {
234 printk(KERN_DEBUG "Could not find i8259 PIC\n");
238 cascade_irq = irq_of_parse_and_map(cascade_node, 0);
239 if (cascade_irq == NO_IRQ) {
240 printk(KERN_ERR "Failed to map cascade interrupt\n");
244 i8259_init(cascade_node, 0);
245 of_node_put(cascade_node);
248 * Hook the interrupt to make sure desc->action is never NULL.
249 * This is required to ensure that the interrupt does not get
250 * disabled when the last user of the shared IRQ line frees their
253 if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
254 printk(KERN_ERR "Failed to setup cascade interrupt\n");
258 /* Success. Connect our low-level cascade handler. */
259 set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);
263 machine_device_initcall(mpc85xx_cds, mpc85xx_cds_8259_attach);
265 #endif /* CONFIG_PPC_I8259 */
268 * Setup the architecture
270 static void __init mpc85xx_cds_setup_arch(void)
273 struct device_node *np;
277 ppc_md.progress("mpc85xx_cds_setup_arch()", 0);
279 cadmus = ioremap(CADMUS_BASE, CADMUS_SIZE);
280 cds_pci_slot = ((cadmus[CM_CSR] >> 6) & 0x3) + 1;
282 if (ppc_md.progress) {
284 snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
285 cadmus[CM_VER], cds_pci_slot);
286 ppc_md.progress(buf, 0);
290 for_each_node_by_type(np, "pci") {
291 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
292 of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
293 struct resource rsrc;
294 of_address_to_resource(np, 0, &rsrc);
295 if ((rsrc.start & 0xfffff) == 0x8000)
296 fsl_add_bridge(np, 1);
298 fsl_add_bridge(np, 0);
302 ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
303 ppc_md.pci_exclude_device = mpc85xx_exclude_device;
307 static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
309 uint pvid, svid, phid1;
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));
326 * Called very early, device-tree isn't unflattened
328 static int __init mpc85xx_cds_probe(void)
330 unsigned long root = of_get_flat_dt_root();
332 return of_flat_dt_is_compatible(root, "MPC85xxCDS");
335 static struct of_device_id __initdata of_bus_ids[] = {
337 { .compatible = "soc", },
338 { .compatible = "simple-bus", },
342 static int __init declare_of_platform_devices(void)
344 return of_platform_bus_probe(NULL, of_bus_ids, NULL);
346 machine_device_initcall(mpc85xx_cds, declare_of_platform_devices);
348 define_machine(mpc85xx_cds) {
349 .name = "MPC85xx CDS",
350 .probe = mpc85xx_cds_probe,
351 .setup_arch = mpc85xx_cds_setup_arch,
352 .init_IRQ = mpc85xx_cds_pic_init,
353 .show_cpuinfo = mpc85xx_cds_show_cpuinfo,
354 .get_irq = mpic_get_irq,
356 .restart = mpc85xx_cds_restart,
357 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
359 .restart = fsl_rstcr_restart,
361 .calibrate_decr = generic_calibrate_decr,
362 .progress = udbg_progress,