339 lines
7.5 KiB
C
339 lines
7.5 KiB
C
/*
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* PCIMT specific code
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 97, 98, 2000, 03, 04, 06 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2006,2007 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/pci.h>
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#include <linux/serial_8250.h>
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#include <asm/sni.h>
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#include <asm/time.h>
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#include <asm/i8259.h>
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#include <asm/irq_cpu.h>
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#define cacheconf (*(volatile unsigned int *)PCIMT_CACHECONF)
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#define invspace (*(volatile unsigned int *)PCIMT_INVSPACE)
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static void __init sni_pcimt_sc_init(void)
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{
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unsigned int scsiz, sc_size;
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scsiz = cacheconf & 7;
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if (scsiz == 0) {
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printk("Second level cache is deactived.\n");
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return;
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}
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if (scsiz >= 6) {
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printk("Invalid second level cache size configured, "
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"deactivating second level cache.\n");
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cacheconf = 0;
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return;
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}
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sc_size = 128 << scsiz;
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printk("%dkb second level cache detected, deactivating.\n", sc_size);
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cacheconf = 0;
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}
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/*
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* A bit more gossip about the iron we're running on ...
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*/
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static inline void sni_pcimt_detect(void)
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{
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char boardtype[80];
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unsigned char csmsr;
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char *p = boardtype;
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unsigned int asic;
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csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
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p += sprintf(p, "%s PCI", (csmsr & 0x80) ? "RM200" : "RM300");
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if ((csmsr & 0x80) == 0)
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p += sprintf(p, ", board revision %s",
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(csmsr & 0x20) ? "D" : "C");
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asic = csmsr & 0x80;
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asic = (csmsr & 0x08) ? asic : !asic;
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p += sprintf(p, ", ASIC PCI Rev %s", asic ? "1.0" : "1.1");
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printk("%s.\n", boardtype);
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}
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#define PORT(_base,_irq) \
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{ \
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.iobase = _base, \
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.irq = _irq, \
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.uartclk = 1843200, \
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.iotype = UPIO_PORT, \
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.flags = UPF_BOOT_AUTOCONF, \
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}
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static struct plat_serial8250_port pcimt_data[] = {
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PORT(0x3f8, 4),
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PORT(0x2f8, 3),
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{ },
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};
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static struct platform_device pcimt_serial8250_device = {
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.name = "serial8250",
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.id = PLAT8250_DEV_PLATFORM,
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.dev = {
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.platform_data = pcimt_data,
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},
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};
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static struct resource pcimt_cmos_rsrc[] = {
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{
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.start = 0x70,
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.end = 0x71,
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.flags = IORESOURCE_IO
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},
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{
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.start = 8,
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.end = 8,
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.flags = IORESOURCE_IRQ
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}
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};
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static struct platform_device pcimt_cmos_device = {
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.name = "rtc_cmos",
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.num_resources = ARRAY_SIZE(pcimt_cmos_rsrc),
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.resource = pcimt_cmos_rsrc
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};
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static struct resource sni_io_resource = {
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.start = 0x00000000UL,
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.end = 0x03bfffffUL,
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.name = "PCIMT IO MEM",
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.flags = IORESOURCE_IO,
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};
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static struct resource pcimt_io_resources[] = {
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{
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.start = 0x00,
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.end = 0x1f,
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.name = "dma1",
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.flags = IORESOURCE_BUSY
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}, {
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.start = 0x40,
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.end = 0x5f,
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.name = "timer",
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.flags = IORESOURCE_BUSY
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}, {
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.start = 0x60,
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.end = 0x6f,
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.name = "keyboard",
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.flags = IORESOURCE_BUSY
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}, {
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.start = 0x80,
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.end = 0x8f,
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.name = "dma page reg",
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.flags = IORESOURCE_BUSY
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}, {
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.start = 0xc0,
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.end = 0xdf,
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.name = "dma2",
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.flags = IORESOURCE_BUSY
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}, {
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.start = 0xcfc,
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.end = 0xcff,
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.name = "PCI config data",
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.flags = IORESOURCE_BUSY
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}
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};
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static struct resource pcimt_mem_resources[] = {
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{
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/*
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* this region should only be 4 bytes long,
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* but it's 16MB on all RM300C I've checked
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*/
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.start = 0x1a000000,
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.end = 0x1affffff,
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.name = "PCI INT ACK",
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.flags = IORESOURCE_BUSY
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}
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};
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static struct resource sni_mem_resource = {
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.start = 0x18000000UL,
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.end = 0x1fbfffffUL,
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.name = "PCIMT PCI MEM",
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.flags = IORESOURCE_MEM
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};
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static void __init sni_pcimt_resource_init(void)
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{
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int i;
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/* request I/O space for devices used on all i[345]86 PCs */
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for (i = 0; i < ARRAY_SIZE(pcimt_io_resources); i++)
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request_resource(&sni_io_resource, pcimt_io_resources + i);
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/* request MEM space for devices used on all i[345]86 PCs */
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for (i = 0; i < ARRAY_SIZE(pcimt_mem_resources); i++)
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request_resource(&sni_mem_resource, pcimt_mem_resources + i);
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}
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extern struct pci_ops sni_pcimt_ops;
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static struct pci_controller sni_controller = {
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.pci_ops = &sni_pcimt_ops,
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.mem_resource = &sni_mem_resource,
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.mem_offset = 0x00000000UL,
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.io_resource = &sni_io_resource,
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.io_offset = 0x00000000UL,
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.io_map_base = SNI_PORT_BASE
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};
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static void enable_pcimt_irq(unsigned int irq)
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{
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unsigned int mask = 1 << (irq - PCIMT_IRQ_INT2);
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*(volatile u8 *) PCIMT_IRQSEL |= mask;
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}
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void disable_pcimt_irq(unsigned int irq)
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{
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unsigned int mask = ~(1 << (irq - PCIMT_IRQ_INT2));
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*(volatile u8 *) PCIMT_IRQSEL &= mask;
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}
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static void end_pcimt_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_pcimt_irq(irq);
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}
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static struct irq_chip pcimt_irq_type = {
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.typename = "PCIMT",
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.ack = disable_pcimt_irq,
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.mask = disable_pcimt_irq,
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.mask_ack = disable_pcimt_irq,
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.unmask = enable_pcimt_irq,
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.end = end_pcimt_irq,
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};
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/*
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* hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
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* button interrupts. Later ...
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*/
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static void pcimt_hwint0(void)
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{
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panic("Received int0 but no handler yet ...");
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}
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/*
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* hwint 1 deals with EISA and SCSI interrupts,
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*
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* The EISA_INT bit in CSITPEND is high active, all others are low active.
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*/
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static void pcimt_hwint1(void)
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{
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u8 pend = *(volatile char *)PCIMT_CSITPEND;
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unsigned long flags;
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if (pend & IT_EISA) {
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int irq;
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/*
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* Note: ASIC PCI's builtin interrupt acknowledge feature is
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* broken. Using it may result in loss of some or all i8259
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* interrupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
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*/
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irq = i8259_irq();
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if (unlikely(irq < 0))
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return;
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do_IRQ(irq);
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}
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if (!(pend & IT_SCSI)) {
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flags = read_c0_status();
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clear_c0_status(ST0_IM);
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do_IRQ(PCIMT_IRQ_SCSI);
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write_c0_status(flags);
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}
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}
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/*
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* hwint 3 should deal with the PCI A - D interrupts,
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*/
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static void pcimt_hwint3(void)
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{
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u8 pend = *(volatile char *)PCIMT_CSITPEND;
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int irq;
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pend &= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
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pend ^= (IT_INTA | IT_INTB | IT_INTC | IT_INTD);
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clear_c0_status(IE_IRQ3);
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irq = PCIMT_IRQ_INT2 + ffs(pend) - 1;
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do_IRQ(irq);
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set_c0_status(IE_IRQ3);
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}
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static void sni_pcimt_hwint(void)
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{
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u32 pending = read_c0_cause() & read_c0_status();
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if (pending & C_IRQ5)
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do_IRQ(MIPS_CPU_IRQ_BASE + 7);
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else if (pending & C_IRQ4)
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do_IRQ(MIPS_CPU_IRQ_BASE + 6);
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else if (pending & C_IRQ3)
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pcimt_hwint3();
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else if (pending & C_IRQ1)
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pcimt_hwint1();
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else if (pending & C_IRQ0) {
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pcimt_hwint0();
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}
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}
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void __init sni_pcimt_irq_init(void)
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{
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int i;
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*(volatile u8 *) PCIMT_IRQSEL = IT_ETH | IT_EISA;
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mips_cpu_irq_init();
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/* Actually we've got more interrupts to handle ... */
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for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_SCSI; i++)
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set_irq_chip_and_handler(i, &pcimt_irq_type, handle_level_irq);
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sni_hwint = sni_pcimt_hwint;
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change_c0_status(ST0_IM, IE_IRQ1|IE_IRQ3);
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}
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void __init sni_pcimt_init(void)
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{
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sni_pcimt_detect();
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sni_pcimt_sc_init();
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ioport_resource.end = sni_io_resource.end;
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#ifdef CONFIG_PCI
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PCIBIOS_MIN_IO = 0x9000;
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register_pci_controller(&sni_controller);
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#endif
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sni_pcimt_resource_init();
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}
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static int __init snirm_pcimt_setup_devinit(void)
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{
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switch (sni_brd_type) {
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case SNI_BRD_PCI_MTOWER:
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case SNI_BRD_PCI_DESKTOP:
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case SNI_BRD_PCI_MTOWER_CPLUS:
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platform_device_register(&pcimt_serial8250_device);
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platform_device_register(&pcimt_cmos_device);
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break;
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}
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return 0;
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}
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device_initcall(snirm_pcimt_setup_devinit);
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