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(unsigned int irq)
51 mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
52 takara_update_irq_hw(irq, mask);
56 takara_disable_irq(unsigned int irq)
59 mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
60 takara_update_irq_hw(irq, mask);
64 takara_startup_irq(unsigned int irq)
66 takara_enable_irq(irq);
67 return 0; /* never anything pending */
71 takara_end_irq(unsigned int irq)
73 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
74 takara_enable_irq(irq);
77 static struct irq_chip takara_irq_type = {
79 .startup = takara_startup_irq,
80 .shutdown = takara_disable_irq,
81 .enable = takara_enable_irq,
82 .disable = takara_disable_irq,
83 .ack = takara_disable_irq,
84 .end = takara_end_irq,
88 takara_device_interrupt(unsigned long vector)
93 * The PALcode will have passed us vectors 0x800 or 0x810,
94 * which are fairly arbitrary values and serve only to tell
95 * us whether an interrupt has come in on IRQ0 or IRQ1. If
96 * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
97 * probably ISA, but PCI interrupts can come through IRQ0
98 * as well if the interrupt controller isn't in accelerated
101 * OTOH, the accelerator thing doesn't seem to be working
102 * overly well, so what we'll do instead is try directly
103 * examining the Master Interrupt Register to see if it's a
104 * PCI interrupt, and if _not_ then we'll pass it on to the
108 intstatus = inw(0x500) & 15;
111 * This is a PCI interrupt. Check each bit and
112 * despatch an interrupt if it's set.
115 if (intstatus & 8) handle_irq(16+3);
116 if (intstatus & 4) handle_irq(16+2);
117 if (intstatus & 2) handle_irq(16+1);
118 if (intstatus & 1) handle_irq(16+0);
120 isa_device_interrupt (vector);
125 takara_srm_device_interrupt(unsigned long vector)
127 int irq = (vector - 0x800) >> 4;
132 takara_init_irq(void)
138 if (alpha_using_srm) {
139 alpha_mv.device_interrupt = takara_srm_device_interrupt;
141 unsigned int ctlreg = inl(0x500);
143 /* Return to non-accelerated mode. */
147 /* Enable the PCI interrupt register. */
152 for (i = 16; i < 128; i += 16)
153 takara_update_irq_hw(i, -1);
155 for (i = 16; i < 128; ++i) {
156 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
157 irq_desc[i].chip = &takara_irq_type;
160 common_init_isa_dma();
165 * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
166 * 19, and 18 respectively, in the default configuration. They can
167 * also be jumpered to slots 8, 7, and 6 respectively, which is fun
168 * because the SIO ISA bridge can also be slot 7. However, the SIO
169 * doesn't explicitly generate PCI-type interrupts, so we can
170 * assign it whatever the hell IRQ we like and it doesn't matter.
174 takara_map_irq_srm(struct pci_dev *dev, u8 slot, u8 pin)
176 static char irq_tab[15][5] __initdata = {
177 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
178 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
179 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
180 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */
181 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */
182 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */
183 /* These are behind the bridges. */
184 { 12, 12, 13, 14, 15}, /* slot 12 == nothing */
185 { 8, 8, 9, 19, 11}, /* slot 13 == nothing */
186 { 4, 4, 5, 6, 7}, /* slot 14 == nothing */
187 { 0, 0, 1, 2, 3}, /* slot 15 == nothing */
188 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */
189 {64+ 0, 64+0, 64+1, 64+2, 64+3}, /* slot 17= device 4 */
190 {48+ 0, 48+0, 48+1, 48+2, 48+3}, /* slot 18= device 3 */
191 {32+ 0, 32+0, 32+1, 32+2, 32+3}, /* slot 19= device 2 */
192 {16+ 0, 16+0, 16+1, 16+2, 16+3}, /* slot 20= device 1 */
194 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
195 int irq = COMMON_TABLE_LOOKUP;
196 if (irq >= 0 && irq < 16) {
197 /* Guess that we are behind a bridge. */
198 unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
199 irq += irq_tab[busslot-min_idsel][0];
205 takara_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
207 static char irq_tab[15][5] __initdata = {
208 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
209 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
210 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
211 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */
212 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */
213 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */
214 { -1, -1, -1, -1, -1}, /* slot 12 == nothing */
215 { -1, -1, -1, -1, -1}, /* slot 13 == nothing */
216 { -1, -1, -1, -1, -1}, /* slot 14 == nothing */
217 { -1, -1, -1, -1, -1}, /* slot 15 == nothing */
218 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */
219 { -1, -1, -1, -1, -1}, /* slot 17 == nothing */
220 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 18 == device 3 */
221 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 19 == device 2 */
222 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 20 == device 1 */
224 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
225 return COMMON_TABLE_LOOKUP;
229 takara_swizzle(struct pci_dev *dev, u8 *pinp)
231 int slot = PCI_SLOT(dev->devfn);
233 unsigned int ctlreg = inl(0x500);
234 unsigned int busslot;
239 busslot = PCI_SLOT(dev->bus->self->devfn);
240 /* Check for built-in bridges. */
241 if (dev->bus->number != 0
243 && ((1<<(36-busslot)) & ctlreg)) {
245 pin += (20 - busslot);
247 printk(KERN_WARNING "takara_swizzle: can only "
248 "handle cards with INTA IRQ pin.\n");
251 /* Must be a card-based bridge. */
252 printk(KERN_WARNING "takara_swizzle: cannot handle "
253 "card-bridge behind builtin bridge yet.\n");
261 takara_init_pci(void)
264 alpha_mv.pci_map_irq = takara_map_irq_srm;
268 if (pc873xx_probe() == -1) {
269 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
271 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
272 pc873xx_get_model(), pc873xx_get_base());
273 pc873xx_enable_ide();
282 struct alpha_machine_vector takara_mv __initmv = {
283 .vector_name = "Takara",
287 .machine_check = cia_machine_check,
288 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
289 .min_io_address = DEFAULT_IO_BASE,
290 .min_mem_address = CIA_DEFAULT_MEM_BASE,
293 .device_interrupt = takara_device_interrupt,
295 .init_arch = cia_init_arch,
296 .init_irq = takara_init_irq,
297 .init_rtc = common_init_rtc,
298 .init_pci = takara_init_pci,
299 .kill_arch = cia_kill_arch,
300 .pci_map_irq = takara_map_irq,
301 .pci_swizzle = takara_swizzle,