2 * linux/arch/alpha/kernel/sys_takara.c
4 * Copyright (C) 1995 David A Rusling
5 * Copyright (C) 1996 Jay A Estabrook
6 * Copyright (C) 1998, 1999 Richard Henderson
8 * Code supporting the TAKARA.
11 #include <linux/kernel.h>
12 #include <linux/types.h>
14 #include <linux/sched.h>
15 #include <linux/pci.h>
16 #include <linux/init.h>
18 #include <asm/ptrace.h>
19 #include <asm/system.h>
22 #include <asm/mmu_context.h>
24 #include <asm/pgtable.h>
25 #include <asm/core_cia.h>
26 #include <asm/tlbflush.h>
31 #include "machvec_impl.h"
34 /* Note mask bit is true for DISABLED irqs. */
35 static unsigned long cached_irq_mask[2] = { -1, -1 };
38 takara_update_irq_hw(unsigned long irq, unsigned long mask)
42 mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
43 regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
44 outl(mask & 0xffff0000UL, regaddr);
48 takara_enable_irq(struct irq_data *d)
50 unsigned int irq = d->irq;
52 mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
53 takara_update_irq_hw(irq, mask);
57 takara_disable_irq(struct irq_data *d)
59 unsigned int irq = d->irq;
61 mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
62 takara_update_irq_hw(irq, mask);
65 static struct irq_chip takara_irq_type = {
67 .irq_unmask = takara_enable_irq,
68 .irq_mask = takara_disable_irq,
69 .irq_mask_ack = takara_disable_irq,
73 takara_device_interrupt(unsigned long vector)
78 * The PALcode will have passed us vectors 0x800 or 0x810,
79 * which are fairly arbitrary values and serve only to tell
80 * us whether an interrupt has come in on IRQ0 or IRQ1. If
81 * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
82 * probably ISA, but PCI interrupts can come through IRQ0
83 * as well if the interrupt controller isn't in accelerated
86 * OTOH, the accelerator thing doesn't seem to be working
87 * overly well, so what we'll do instead is try directly
88 * examining the Master Interrupt Register to see if it's a
89 * PCI interrupt, and if _not_ then we'll pass it on to the
93 intstatus = inw(0x500) & 15;
96 * This is a PCI interrupt. Check each bit and
97 * despatch an interrupt if it's set.
100 if (intstatus & 8) handle_irq(16+3);
101 if (intstatus & 4) handle_irq(16+2);
102 if (intstatus & 2) handle_irq(16+1);
103 if (intstatus & 1) handle_irq(16+0);
105 isa_device_interrupt (vector);
110 takara_srm_device_interrupt(unsigned long vector)
112 int irq = (vector - 0x800) >> 4;
117 takara_init_irq(void)
123 if (alpha_using_srm) {
124 alpha_mv.device_interrupt = takara_srm_device_interrupt;
126 unsigned int ctlreg = inl(0x500);
128 /* Return to non-accelerated mode. */
132 /* Enable the PCI interrupt register. */
137 for (i = 16; i < 128; i += 16)
138 takara_update_irq_hw(i, -1);
140 for (i = 16; i < 128; ++i) {
141 irq_set_chip_and_handler(i, &takara_irq_type,
143 irq_set_status_flags(i, IRQ_LEVEL);
146 common_init_isa_dma();
151 * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
152 * 19, and 18 respectively, in the default configuration. They can
153 * also be jumpered to slots 8, 7, and 6 respectively, which is fun
154 * because the SIO ISA bridge can also be slot 7. However, the SIO
155 * doesn't explicitly generate PCI-type interrupts, so we can
156 * assign it whatever the hell IRQ we like and it doesn't matter.
160 takara_map_irq_srm(struct pci_dev *dev, u8 slot, u8 pin)
162 static char irq_tab[15][5] __initdata = {
163 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
164 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
165 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
166 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */
167 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */
168 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */
169 /* These are behind the bridges. */
170 { 12, 12, 13, 14, 15}, /* slot 12 == nothing */
171 { 8, 8, 9, 19, 11}, /* slot 13 == nothing */
172 { 4, 4, 5, 6, 7}, /* slot 14 == nothing */
173 { 0, 0, 1, 2, 3}, /* slot 15 == nothing */
174 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */
175 {64+ 0, 64+0, 64+1, 64+2, 64+3}, /* slot 17= device 4 */
176 {48+ 0, 48+0, 48+1, 48+2, 48+3}, /* slot 18= device 3 */
177 {32+ 0, 32+0, 32+1, 32+2, 32+3}, /* slot 19= device 2 */
178 {16+ 0, 16+0, 16+1, 16+2, 16+3}, /* slot 20= device 1 */
180 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
181 int irq = COMMON_TABLE_LOOKUP;
182 if (irq >= 0 && irq < 16) {
183 /* Guess that we are behind a bridge. */
184 unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
185 irq += irq_tab[busslot-min_idsel][0];
191 takara_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
193 static char irq_tab[15][5] __initdata = {
194 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
195 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
196 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
197 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */
198 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */
199 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */
200 { -1, -1, -1, -1, -1}, /* slot 12 == nothing */
201 { -1, -1, -1, -1, -1}, /* slot 13 == nothing */
202 { -1, -1, -1, -1, -1}, /* slot 14 == nothing */
203 { -1, -1, -1, -1, -1}, /* slot 15 == nothing */
204 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */
205 { -1, -1, -1, -1, -1}, /* slot 17 == nothing */
206 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 18 == device 3 */
207 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 19 == device 2 */
208 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 20 == device 1 */
210 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
211 return COMMON_TABLE_LOOKUP;
215 takara_swizzle(struct pci_dev *dev, u8 *pinp)
217 int slot = PCI_SLOT(dev->devfn);
219 unsigned int ctlreg = inl(0x500);
220 unsigned int busslot;
225 busslot = PCI_SLOT(dev->bus->self->devfn);
226 /* Check for built-in bridges. */
227 if (dev->bus->number != 0
229 && ((1<<(36-busslot)) & ctlreg)) {
231 pin += (20 - busslot);
233 printk(KERN_WARNING "takara_swizzle: can only "
234 "handle cards with INTA IRQ pin.\n");
237 /* Must be a card-based bridge. */
238 printk(KERN_WARNING "takara_swizzle: cannot handle "
239 "card-bridge behind builtin bridge yet.\n");
247 takara_init_pci(void)
250 alpha_mv.pci_map_irq = takara_map_irq_srm;
254 if (pc873xx_probe() == -1) {
255 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
257 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
258 pc873xx_get_model(), pc873xx_get_base());
259 pc873xx_enable_ide();
268 struct alpha_machine_vector takara_mv __initmv = {
269 .vector_name = "Takara",
273 .machine_check = cia_machine_check,
274 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
275 .min_io_address = DEFAULT_IO_BASE,
276 .min_mem_address = CIA_DEFAULT_MEM_BASE,
279 .device_interrupt = takara_device_interrupt,
281 .init_arch = cia_init_arch,
282 .init_irq = takara_init_irq,
283 .init_rtc = common_init_rtc,
284 .init_pci = takara_init_pci,
285 .kill_arch = cia_kill_arch,
286 .pci_map_irq = takara_map_irq,
287 .pci_swizzle = takara_swizzle,