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 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/pci.h>
15 #include <linux/serial_8250.h>
17 #include <asm/mc146818-time.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 deactived.\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 sni_io_resource = {
94 .start = 0x00000000UL,
96 .name = "PCIMT IO MEM",
97 .flags = IORESOURCE_IO,
100 static struct resource pcimt_io_resources[] = {
105 .flags = IORESOURCE_BUSY
110 .flags = IORESOURCE_BUSY
115 .flags = IORESOURCE_BUSY
119 .name = "dma page reg",
120 .flags = IORESOURCE_BUSY
125 .flags = IORESOURCE_BUSY
129 .name = "PCI config data",
130 .flags = IORESOURCE_BUSY
134 static struct resource sni_mem_resource = {
135 .start = 0x18000000UL,
137 .name = "PCIMT PCI MEM",
138 .flags = IORESOURCE_MEM
141 static void __init sni_pcimt_resource_init(void)
145 /* request I/O space for devices used on all i[345]86 PCs */
146 for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
147 request_resource(&sni_io_resource, pcimt_io_resources + i);
150 extern struct pci_ops sni_pcimt_ops;
152 static struct pci_controller sni_controller = {
153 .pci_ops = &sni_pcimt_ops,
154 .mem_resource = &sni_mem_resource,
155 .mem_offset = 0x00000000UL,
156 .io_resource = &sni_io_resource,
157 .io_offset = 0x00000000UL,
158 .io_map_base = SNI_PORT_BASE
161 static void enable_pcimt_irq(unsigned int irq)
163 unsigned int mask = 1 << (irq - PCIMT_IRQ_INT2);
165 *(volatile u8 *) PCIMT_IRQSEL |= mask;
168 void disable_pcimt_irq(unsigned int irq)
170 unsigned int mask = ~(1 << (irq - PCIMT_IRQ_INT2));
172 *(volatile u8 *) PCIMT_IRQSEL &= mask;
175 static void end_pcimt_irq(unsigned int irq)
177 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
178 enable_pcimt_irq(irq);
181 static struct irq_chip pcimt_irq_type = {
183 .ack = disable_pcimt_irq,
184 .mask = disable_pcimt_irq,
185 .mask_ack = disable_pcimt_irq,
186 .unmask = enable_pcimt_irq,
187 .end = end_pcimt_irq,
191 * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
192 * button interrupts. Later ...
194 static void pcimt_hwint0(void)
196 panic("Received int0 but no handler yet ...");
200 * hwint 1 deals with EISA and SCSI interrupts,
202 * The EISA_INT bit in CSITPEND is high active, all others are low active.
204 static void pcimt_hwint1(void)
206 u8 pend = *(volatile char *)PCIMT_CSITPEND;
209 if (pend & IT_EISA) {
212 * Note: ASIC PCI's builtin interrupt achknowledge feature is
213 * broken. Using it may result in loss of some or all i8259
214 * interupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
217 if (unlikely(irq < 0))
223 if (!(pend & IT_SCSI)) {
224 flags = read_c0_status();
225 clear_c0_status(ST0_IM);
226 do_IRQ(PCIMT_IRQ_SCSI);
227 write_c0_status(flags);
232 * hwint 3 should deal with the PCI A - D interrupts,
234 static void pcimt_hwint3(void)
236 u8 pend = *(volatile char *)PCIMT_CSITPEND;
239 pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
240 pend ^= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
241 clear_c0_status(IE_IRQ3);
242 irq = PCIMT_IRQ_INT2 + ffs(pend) - 1;
244 set_c0_status(IE_IRQ3);
247 static void sni_pcimt_hwint(void)
249 u32 pending = read_c0_cause() & read_c0_status();
251 if (pending & C_IRQ5)
252 do_IRQ (MIPS_CPU_IRQ_BASE + 7);
253 else if (pending & C_IRQ4)
254 do_IRQ (MIPS_CPU_IRQ_BASE + 6);
255 else if (pending & C_IRQ3)
257 else if (pending & C_IRQ1)
259 else if (pending & C_IRQ0) {
264 void __init sni_pcimt_irq_init(void)
268 *(volatile u8 *) PCIMT_IRQSEL = IT_ETH | IT_EISA;
270 /* Actually we've got more interrupts to handle ... */
271 for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_SCSI; i++)
272 set_irq_chip(i, &pcimt_irq_type);
273 sni_hwint = sni_pcimt_hwint;
274 change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ3);
277 void sni_pcimt_init(void)
281 rtc_mips_get_time = mc146818_get_cmos_time;
282 rtc_mips_set_time = mc146818_set_rtc_mmss;
283 board_time_init = sni_cpu_time_init;
284 ioport_resource.end = sni_io_resource.end;
286 PCIBIOS_MIN_IO = 0x9000;
287 register_pci_controller(&sni_controller);
289 sni_pcimt_resource_init();
292 static int __init snirm_pcimt_setup_devinit(void)
294 switch (sni_brd_type) {
295 case SNI_BRD_PCI_MTOWER:
296 case SNI_BRD_PCI_DESKTOP:
297 case SNI_BRD_PCI_MTOWER_CPLUS:
298 platform_device_register(&pcimt_serial8250_device);
305 device_initcall(snirm_pcimt_setup_devinit);