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Linux/arch/alpha/kernel/sys_takara.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *      linux/arch/alpha/kernel/sys_takara.c
  4  *
  5  *      Copyright (C) 1995 David A Rusling
  6  *      Copyright (C) 1996 Jay A Estabrook
  7  *      Copyright (C) 1998, 1999 Richard Henderson
  8  *
  9  * Code supporting the TAKARA.
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/types.h>
 14 #include <linux/mm.h>
 15 #include <linux/sched.h>
 16 #include <linux/pci.h>
 17 #include <linux/init.h>
 18 
 19 #include <asm/ptrace.h>
 20 #include <asm/dma.h>
 21 #include <asm/irq.h>
 22 #include <asm/mmu_context.h>
 23 #include <asm/io.h>
 24 #include <asm/pgtable.h>
 25 #include <asm/core_cia.h>
 26 #include <asm/tlbflush.h>
 27 
 28 #include "proto.h"
 29 #include "irq_impl.h"
 30 #include "pci_impl.h"
 31 #include "machvec_impl.h"
 32 #include "pc873xx.h"
 33 
 34 /* Note mask bit is true for DISABLED irqs.  */
 35 static unsigned long cached_irq_mask[2] = { -1, -1 };
 36 
 37 static inline void
 38 takara_update_irq_hw(unsigned long irq, unsigned long mask)
 39 {
 40         int regaddr;
 41 
 42         mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
 43         regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
 44         outl(mask & 0xffff0000UL, regaddr);
 45 }
 46 
 47 static inline void
 48 takara_enable_irq(struct irq_data *d)
 49 {
 50         unsigned int irq = d->irq;
 51         unsigned long mask;
 52         mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
 53         takara_update_irq_hw(irq, mask);
 54 }
 55 
 56 static void
 57 takara_disable_irq(struct irq_data *d)
 58 {
 59         unsigned int irq = d->irq;
 60         unsigned long mask;
 61         mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
 62         takara_update_irq_hw(irq, mask);
 63 }
 64 
 65 static struct irq_chip takara_irq_type = {
 66         .name           = "TAKARA",
 67         .irq_unmask     = takara_enable_irq,
 68         .irq_mask       = takara_disable_irq,
 69         .irq_mask_ack   = takara_disable_irq,
 70 };
 71 
 72 static void
 73 takara_device_interrupt(unsigned long vector)
 74 {
 75         unsigned intstatus;
 76 
 77         /*
 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
 84          * mode.
 85          *
 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
 90          * ISA handler.
 91          */
 92 
 93         intstatus = inw(0x500) & 15;
 94         if (intstatus) {
 95                 /*
 96                  * This is a PCI interrupt. Check each bit and
 97                  * despatch an interrupt if it's set.
 98                  */
 99 
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);
104         } else {
105                 isa_device_interrupt (vector);
106         }
107 }
108 
109 static void 
110 takara_srm_device_interrupt(unsigned long vector)
111 {
112         int irq = (vector - 0x800) >> 4;
113         handle_irq(irq);
114 }
115 
116 static void __init
117 takara_init_irq(void)
118 {
119         long i;
120 
121         init_i8259a_irqs();
122 
123         if (alpha_using_srm) {
124                 alpha_mv.device_interrupt = takara_srm_device_interrupt;
125         } else {
126                 unsigned int ctlreg = inl(0x500);
127 
128                 /* Return to non-accelerated mode.  */
129                 ctlreg &= ~0x8000;
130                 outl(ctlreg, 0x500);
131 
132                 /* Enable the PCI interrupt register.  */
133                 ctlreg = 0x05107c00;
134                 outl(ctlreg, 0x500);
135         }
136 
137         for (i = 16; i < 128; i += 16)
138                 takara_update_irq_hw(i, -1);
139 
140         for (i = 16; i < 128; ++i) {
141                 irq_set_chip_and_handler(i, &takara_irq_type,
142                                          handle_level_irq);
143                 irq_set_status_flags(i, IRQ_LEVEL);
144         }
145 
146         common_init_isa_dma();
147 }
148 
149 
150 /*
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.
157  */
158 
159 static int
160 takara_map_irq_srm(const struct pci_dev *dev, u8 slot, u8 pin)
161 {
162         static char irq_tab[15][5] = {
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 */
179         };
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];
186         }
187         return irq;
188 }
189 
190 static int __init
191 takara_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
192 {
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 */
209         };
210         const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
211         return COMMON_TABLE_LOOKUP;
212 }
213 
214 static u8
215 takara_swizzle(struct pci_dev *dev, u8 *pinp)
216 {
217         int slot = PCI_SLOT(dev->devfn);
218         int pin = *pinp;
219         unsigned int ctlreg = inl(0x500);
220         unsigned int busslot;
221 
222         if (!dev->bus->self)
223                 return slot;
224 
225         busslot = PCI_SLOT(dev->bus->self->devfn);
226         /* Check for built-in bridges.  */
227         if (dev->bus->number != 0
228             && busslot > 16
229             && ((1<<(36-busslot)) & ctlreg)) {
230                 if (pin == 1)
231                         pin += (20 - busslot);
232                 else {
233                         printk(KERN_WARNING "takara_swizzle: can only "
234                                "handle cards with INTA IRQ pin.\n");
235                 }
236         } else {
237                 /* Must be a card-based bridge.  */
238                 printk(KERN_WARNING "takara_swizzle: cannot handle "
239                        "card-bridge behind builtin bridge yet.\n");
240         }
241 
242         *pinp = pin;
243         return slot;
244 }
245 
246 static void __init
247 takara_init_pci(void)
248 {
249         if (alpha_using_srm)
250                 alpha_mv.pci_map_irq = takara_map_irq_srm;
251 
252         cia_init_pci();
253 
254         if (pc873xx_probe() == -1) {
255                 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
256         } else {
257                 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
258                         pc873xx_get_model(), pc873xx_get_base());
259                 pc873xx_enable_ide();
260         }
261 }
262 
263 
264 /*
265  * The System Vector
266  */
267 
268 struct alpha_machine_vector takara_mv __initmv = {
269         .vector_name            = "Takara",
270         DO_EV5_MMU,
271         DO_DEFAULT_RTC,
272         DO_CIA_IO,
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,
277 
278         .nr_irqs                = 128,
279         .device_interrupt       = takara_device_interrupt,
280 
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,
288 };
289 ALIAS_MV(takara)
290 

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