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Linux/arch/alpha/kernel/sys_takara.c

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  1 /*
  2  *      linux/arch/alpha/kernel/sys_takara.c
  3  *
  4  *      Copyright (C) 1995 David A Rusling
  5  *      Copyright (C) 1996 Jay A Estabrook
  6  *      Copyright (C) 1998, 1999 Richard Henderson
  7  *
  8  * Code supporting the TAKARA.
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/types.h>
 13 #include <linux/mm.h>
 14 #include <linux/sched.h>
 15 #include <linux/pci.h>
 16 #include <linux/init.h>
 17 
 18 #include <asm/ptrace.h>
 19 #include <asm/dma.h>
 20 #include <asm/irq.h>
 21 #include <asm/mmu_context.h>
 22 #include <asm/io.h>
 23 #include <asm/pgtable.h>
 24 #include <asm/core_cia.h>
 25 #include <asm/tlbflush.h>
 26 
 27 #include "proto.h"
 28 #include "irq_impl.h"
 29 #include "pci_impl.h"
 30 #include "machvec_impl.h"
 31 #include "pc873xx.h"
 32 
 33 /* Note mask bit is true for DISABLED irqs.  */
 34 static unsigned long cached_irq_mask[2] = { -1, -1 };
 35 
 36 static inline void
 37 takara_update_irq_hw(unsigned long irq, unsigned long mask)
 38 {
 39         int regaddr;
 40 
 41         mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
 42         regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
 43         outl(mask & 0xffff0000UL, regaddr);
 44 }
 45 
 46 static inline void
 47 takara_enable_irq(struct irq_data *d)
 48 {
 49         unsigned int irq = d->irq;
 50         unsigned long mask;
 51         mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
 52         takara_update_irq_hw(irq, mask);
 53 }
 54 
 55 static void
 56 takara_disable_irq(struct irq_data *d)
 57 {
 58         unsigned int irq = d->irq;
 59         unsigned long mask;
 60         mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
 61         takara_update_irq_hw(irq, mask);
 62 }
 63 
 64 static struct irq_chip takara_irq_type = {
 65         .name           = "TAKARA",
 66         .irq_unmask     = takara_enable_irq,
 67         .irq_mask       = takara_disable_irq,
 68         .irq_mask_ack   = takara_disable_irq,
 69 };
 70 
 71 static void
 72 takara_device_interrupt(unsigned long vector)
 73 {
 74         unsigned intstatus;
 75 
 76         /*
 77          * The PALcode will have passed us vectors 0x800 or 0x810,
 78          * which are fairly arbitrary values and serve only to tell
 79          * us whether an interrupt has come in on IRQ0 or IRQ1. If
 80          * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
 81          * probably ISA, but PCI interrupts can come through IRQ0
 82          * as well if the interrupt controller isn't in accelerated
 83          * mode.
 84          *
 85          * OTOH, the accelerator thing doesn't seem to be working
 86          * overly well, so what we'll do instead is try directly
 87          * examining the Master Interrupt Register to see if it's a
 88          * PCI interrupt, and if _not_ then we'll pass it on to the
 89          * ISA handler.
 90          */
 91 
 92         intstatus = inw(0x500) & 15;
 93         if (intstatus) {
 94                 /*
 95                  * This is a PCI interrupt. Check each bit and
 96                  * despatch an interrupt if it's set.
 97                  */
 98 
 99                 if (intstatus & 8) handle_irq(16+3);
100                 if (intstatus & 4) handle_irq(16+2);
101                 if (intstatus & 2) handle_irq(16+1);
102                 if (intstatus & 1) handle_irq(16+0);
103         } else {
104                 isa_device_interrupt (vector);
105         }
106 }
107 
108 static void 
109 takara_srm_device_interrupt(unsigned long vector)
110 {
111         int irq = (vector - 0x800) >> 4;
112         handle_irq(irq);
113 }
114 
115 static void __init
116 takara_init_irq(void)
117 {
118         long i;
119 
120         init_i8259a_irqs();
121 
122         if (alpha_using_srm) {
123                 alpha_mv.device_interrupt = takara_srm_device_interrupt;
124         } else {
125                 unsigned int ctlreg = inl(0x500);
126 
127                 /* Return to non-accelerated mode.  */
128                 ctlreg &= ~0x8000;
129                 outl(ctlreg, 0x500);
130 
131                 /* Enable the PCI interrupt register.  */
132                 ctlreg = 0x05107c00;
133                 outl(ctlreg, 0x500);
134         }
135 
136         for (i = 16; i < 128; i += 16)
137                 takara_update_irq_hw(i, -1);
138 
139         for (i = 16; i < 128; ++i) {
140                 irq_set_chip_and_handler(i, &takara_irq_type,
141                                          handle_level_irq);
142                 irq_set_status_flags(i, IRQ_LEVEL);
143         }
144 
145         common_init_isa_dma();
146 }
147 
148 
149 /*
150  * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
151  * 19, and 18 respectively, in the default configuration. They can
152  * also be jumpered to slots 8, 7, and 6 respectively, which is fun
153  * because the SIO ISA bridge can also be slot 7. However, the SIO
154  * doesn't explicitly generate PCI-type interrupts, so we can
155  * assign it whatever the hell IRQ we like and it doesn't matter.
156  */
157 
158 static int __init
159 takara_map_irq_srm(const struct pci_dev *dev, u8 slot, u8 pin)
160 {
161         static char irq_tab[15][5] __initdata = {
162                 { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
163                 { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
164                 { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
165                 {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
166                 {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
167                 {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
168                 /* These are behind the bridges.  */
169                 {   12,   12,   13,   14,   15},   /* slot 12 == nothing */
170                 {    8,    8,    9,   19,   11},   /* slot 13 == nothing */
171                 {    4,    4,    5,    6,    7},   /* slot 14 == nothing */
172                 {    0,    0,    1,    2,    3},   /* slot 15 == nothing */
173                 {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
174                 {64+ 0, 64+0, 64+1, 64+2, 64+3},   /* slot 17= device 4 */
175                 {48+ 0, 48+0, 48+1, 48+2, 48+3},   /* slot 18= device 3 */
176                 {32+ 0, 32+0, 32+1, 32+2, 32+3},   /* slot 19= device 2 */
177                 {16+ 0, 16+0, 16+1, 16+2, 16+3},   /* slot 20= device 1 */
178         };
179         const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
180         int irq = COMMON_TABLE_LOOKUP;
181         if (irq >= 0 && irq < 16) {
182                 /* Guess that we are behind a bridge.  */
183                 unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
184                 irq += irq_tab[busslot-min_idsel][0];
185         }
186         return irq;
187 }
188 
189 static int __init
190 takara_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
191 {
192         static char irq_tab[15][5] __initdata = {
193                 { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
194                 { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
195                 { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
196                 {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
197                 {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
198                 {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
199                 {   -1,   -1,   -1,   -1,   -1},   /* slot 12 == nothing */
200                 {   -1,   -1,   -1,   -1,   -1},   /* slot 13 == nothing */
201                 {   -1,   -1,   -1,   -1,   -1},   /* slot 14 == nothing */
202                 {   -1,   -1,   -1,   -1,   -1},   /* slot 15 == nothing */
203                 {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
204                 {   -1,   -1,   -1,   -1,   -1},   /* slot 17 == nothing */
205                 { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot 18 == device 3 */
206                 { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot 19 == device 2 */
207                 { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot 20 == device 1 */
208         };
209         const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
210         return COMMON_TABLE_LOOKUP;
211 }
212 
213 static u8 __init
214 takara_swizzle(struct pci_dev *dev, u8 *pinp)
215 {
216         int slot = PCI_SLOT(dev->devfn);
217         int pin = *pinp;
218         unsigned int ctlreg = inl(0x500);
219         unsigned int busslot;
220 
221         if (!dev->bus->self)
222                 return slot;
223 
224         busslot = PCI_SLOT(dev->bus->self->devfn);
225         /* Check for built-in bridges.  */
226         if (dev->bus->number != 0
227             && busslot > 16
228             && ((1<<(36-busslot)) & ctlreg)) {
229                 if (pin == 1)
230                         pin += (20 - busslot);
231                 else {
232                         printk(KERN_WARNING "takara_swizzle: can only "
233                                "handle cards with INTA IRQ pin.\n");
234                 }
235         } else {
236                 /* Must be a card-based bridge.  */
237                 printk(KERN_WARNING "takara_swizzle: cannot handle "
238                        "card-bridge behind builtin bridge yet.\n");
239         }
240 
241         *pinp = pin;
242         return slot;
243 }
244 
245 static void __init
246 takara_init_pci(void)
247 {
248         if (alpha_using_srm)
249                 alpha_mv.pci_map_irq = takara_map_irq_srm;
250 
251         cia_init_pci();
252 
253         if (pc873xx_probe() == -1) {
254                 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
255         } else {
256                 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
257                         pc873xx_get_model(), pc873xx_get_base());
258                 pc873xx_enable_ide();
259         }
260 }
261 
262 
263 /*
264  * The System Vector
265  */
266 
267 struct alpha_machine_vector takara_mv __initmv = {
268         .vector_name            = "Takara",
269         DO_EV5_MMU,
270         DO_DEFAULT_RTC,
271         DO_CIA_IO,
272         .machine_check          = cia_machine_check,
273         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
274         .min_io_address         = DEFAULT_IO_BASE,
275         .min_mem_address        = CIA_DEFAULT_MEM_BASE,
276 
277         .nr_irqs                = 128,
278         .device_interrupt       = takara_device_interrupt,
279 
280         .init_arch              = cia_init_arch,
281         .init_irq               = takara_init_irq,
282         .init_rtc               = common_init_rtc,
283         .init_pci               = takara_init_pci,
284         .kill_arch              = cia_kill_arch,
285         .pci_map_irq            = takara_map_irq,
286         .pci_swizzle            = takara_swizzle,
287 };
288 ALIAS_MV(takara)
289 

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