4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org)
9 * Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/pci.h>
16 #include <linux/serial_8250.h>
20 #include <asm/i8259.h>
21 #include <asm/irq_cpu.h>
23 #define cacheconf (*(volatile unsigned int *)PCIMT_CACHECONF)
24 #define invspace (*(volatile unsigned int *)PCIMT_INVSPACE)
26 static void __init sni_pcimt_sc_init(void)
28 unsigned int scsiz, sc_size;
30 scsiz = cacheconf & 7;
32 printk("Second level cache is deactivated.\n");
36 printk("Invalid second level cache size configured, "
37 "deactivating second level cache.\n");
42 sc_size = 128 << scsiz;
43 printk("%dkb second level cache detected, deactivating.\n", sc_size);
49 * A bit more gossip about the iron we're running on ...
51 static inline void sni_pcimt_detect(void)
58 csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
60 p += sprintf(p, "%s PCI", (csmsr & 0x80) ? "RM200" : "RM300");
61 if ((csmsr & 0x80) == 0)
62 p += sprintf(p, ", board revision %s",
63 (csmsr & 0x20) ? "D" : "C");
65 asic = (csmsr & 0x08) ? asic : !asic;
66 p += sprintf(p, ", ASIC PCI Rev %s", asic ? "1.0" : "1.1");
67 printk("%s.\n", boardtype);
70 #define PORT(_base,_irq) \
75 .iotype = UPIO_PORT, \
76 .flags = UPF_BOOT_AUTOCONF, \
79 static struct plat_serial8250_port pcimt_data[] = {
85 static struct platform_device pcimt_serial8250_device = {
87 .id = PLAT8250_DEV_PLATFORM,
89 .platform_data = pcimt_data,
93 static struct resource pcimt_cmos_rsrc[] = {
97 .flags = IORESOURCE_IO
102 .flags = IORESOURCE_IRQ
106 static struct platform_device pcimt_cmos_device = {
108 .num_resources = ARRAY_SIZE(pcimt_cmos_rsrc),
109 .resource = pcimt_cmos_rsrc
113 static struct resource sni_io_resource = {
114 .start = 0x00000000UL,
116 .name = "PCIMT IO MEM",
117 .flags = IORESOURCE_IO,
120 static struct resource pcimt_io_resources[] = {
125 .flags = IORESOURCE_BUSY
130 .flags = IORESOURCE_BUSY
135 .flags = IORESOURCE_BUSY
139 .name = "dma page reg",
140 .flags = IORESOURCE_BUSY
145 .flags = IORESOURCE_BUSY
149 .name = "PCI config data",
150 .flags = IORESOURCE_BUSY
154 static struct resource pcimt_mem_resources[] = {
157 * this region should only be 4 bytes long,
158 * but it's 16MB on all RM300C I've checked
162 .name = "PCI INT ACK",
163 .flags = IORESOURCE_BUSY
167 static struct resource sni_mem_resource = {
168 .start = 0x18000000UL,
170 .name = "PCIMT PCI MEM",
171 .flags = IORESOURCE_MEM
174 static void __init sni_pcimt_resource_init(void)
178 /* request I/O space for devices used on all i[345]86 PCs */
179 for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
180 request_resource(&sni_io_resource, pcimt_io_resources + i);
181 /* request MEM space for devices used on all i[345]86 PCs */
182 for (i = 0; i < ARRAY_SIZE(pcimt_mem_resources); i++)
183 request_resource(&sni_mem_resource, pcimt_mem_resources + i);
186 extern struct pci_ops sni_pcimt_ops;
189 static struct pci_controller sni_controller = {
190 .pci_ops = &sni_pcimt_ops,
191 .mem_resource = &sni_mem_resource,
192 .mem_offset = 0x00000000UL,
193 .io_resource = &sni_io_resource,
194 .io_offset = 0x00000000UL,
195 .io_map_base = SNI_PORT_BASE
199 static void enable_pcimt_irq(struct irq_data *d)
201 unsigned int mask = 1 << (d->irq - PCIMT_IRQ_INT2);
203 *(volatile u8 *) PCIMT_IRQSEL |= mask;
206 void disable_pcimt_irq(struct irq_data *d)
208 unsigned int mask = ~(1 << (d->irq - PCIMT_IRQ_INT2));
210 *(volatile u8 *) PCIMT_IRQSEL &= mask;
213 static struct irq_chip pcimt_irq_type = {
215 .irq_mask = disable_pcimt_irq,
216 .irq_unmask = enable_pcimt_irq,
220 * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
221 * button interrupts. Later ...
223 static void pcimt_hwint0(void)
225 panic("Received int0 but no handler yet ...");
229 * hwint 1 deals with EISA and SCSI interrupts,
231 * The EISA_INT bit in CSITPEND is high active, all others are low active.
233 static void pcimt_hwint1(void)
235 u8 pend = *(volatile char *)PCIMT_CSITPEND;
238 if (pend & IT_EISA) {
241 * Note: ASIC PCI's builtin interrupt acknowledge feature is
242 * broken. Using it may result in loss of some or all i8259
243 * interrupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
246 if (unlikely(irq < 0))
252 if (!(pend & IT_SCSI)) {
253 flags = read_c0_status();
254 clear_c0_status(ST0_IM);
255 do_IRQ(PCIMT_IRQ_SCSI);
256 write_c0_status(flags);
261 * hwint 3 should deal with the PCI A - D interrupts,
263 static void pcimt_hwint3(void)
265 u8 pend = *(volatile char *)PCIMT_CSITPEND;
268 pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
269 pend ^= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
270 clear_c0_status(IE_IRQ3);
271 irq = PCIMT_IRQ_INT2 + ffs(pend) - 1;
273 set_c0_status(IE_IRQ3);
276 static void sni_pcimt_hwint(void)
278 u32 pending = read_c0_cause() & read_c0_status();
280 if (pending & C_IRQ5)
281 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
282 else if (pending & C_IRQ4)
283 do_IRQ(MIPS_CPU_IRQ_BASE + 6);
284 else if (pending & C_IRQ3)
286 else if (pending & C_IRQ1)
288 else if (pending & C_IRQ0) {
293 void __init sni_pcimt_irq_init(void)
297 *(volatile u8 *) PCIMT_IRQSEL = IT_ETH | IT_EISA;
299 /* Actually we've got more interrupts to handle ... */
300 for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_SCSI; i++)
301 irq_set_chip_and_handler(i, &pcimt_irq_type, handle_level_irq);
302 sni_hwint = sni_pcimt_hwint;
303 change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ3);
306 void __init sni_pcimt_init(void)
310 ioport_resource.end = sni_io_resource.end;
312 PCIBIOS_MIN_IO = 0x9000;
313 register_pci_controller(&sni_controller);
315 sni_pcimt_resource_init();
318 static int __init snirm_pcimt_setup_devinit(void)
320 switch (sni_brd_type) {
321 case SNI_BRD_PCI_MTOWER:
322 case SNI_BRD_PCI_DESKTOP:
323 case SNI_BRD_PCI_MTOWER_CPLUS:
324 platform_device_register(&pcimt_serial8250_device);
325 platform_device_register(&pcimt_cmos_device);
332 device_initcall(snirm_pcimt_setup_devinit);