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Linux 2.6.19-rc6
[cris-mirror.git] / arch / powerpc / sysdev / tsi108_pci.c
blob322f86e93de5b43f677e7bbc7e26a2a80fcb417c
1 /*
2 * Common routines for Tundra Semiconductor TSI108 host bridge.
3 *
4 * 2004-2005 (c) Tundra Semiconductor Corp.
5 * Author: Alex Bounine (alexandreb@tundra.com)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc., 59
19 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/pci.h>
25 #include <linux/slab.h>
26 #include <linux/irq.h>
27 #include <linux/interrupt.h>
28
29 #include <asm/byteorder.h>
30 #include <asm/io.h>
31 #include <asm/irq.h>
32 #include <asm/uaccess.h>
33 #include <asm/machdep.h>
34 #include <asm/pci-bridge.h>
35 #include <asm/tsi108.h>
36 #include <asm/tsi108_irq.h>
37 #include <asm/prom.h>
38
39 #undef DEBUG
40 #ifdef DEBUG
41 #define DBG(x...) printk(x)
42 #else
43 #define DBG(x...)
44 #endif
45
46 #define tsi_mk_config_addr(bus, devfunc, offset) \
47 ((((bus)<<16) | ((devfunc)<<8) | (offset & 0xfc)) + tsi108_pci_cfg_base)
48
49 u32 tsi108_pci_cfg_base;
50 u32 tsi108_csr_vir_base;
51
52 extern u32 get_vir_csrbase(void);
53 extern u32 tsi108_read_reg(u32 reg_offset);
54 extern void tsi108_write_reg(u32 reg_offset, u32 val);
55
56 int
57 tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc,
58 int offset, int len, u32 val)
59 {
60 volatile unsigned char *cfg_addr;
61
62 if (ppc_md.pci_exclude_device)
63 if (ppc_md.pci_exclude_device(bus->number, devfunc))
64 return PCIBIOS_DEVICE_NOT_FOUND;
65
66 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
67 devfunc, offset) |
68 (offset & 0x03));
69
70 #ifdef DEBUG
71 printk("PCI CFG write : ");
72 printk("%d:0x%x:0x%x ", bus->number, devfunc, offset);
73 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
74 printk("data = 0x%08x\n", val);
75 #endif
76
77 switch (len) {
78 case 1:
79 out_8((u8 *) cfg_addr, val);
80 break;
81 case 2:
82 out_le16((u16 *) cfg_addr, val);
83 break;
84 default:
85 out_le32((u32 *) cfg_addr, val);
86 break;
87 }
88
89 return PCIBIOS_SUCCESSFUL;
90 }
91
92 void tsi108_clear_pci_error(u32 pci_cfg_base)
93 {
94 u32 err_stat, err_addr, pci_stat;
95
96 /*
97 * Quietly clear PB and PCI error flags set as result
98 * of PCI/X configuration read requests.
99 */
100
101 /* Read PB Error Log Registers */
102
103 err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
104 err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
105
106 if (err_stat & TSI108_PB_ERRCS_ES) {
107 /* Clear error flag */
108 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
109 TSI108_PB_ERRCS_ES);
110
111 /* Clear read error reported in PB_ISR */
112 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR,
113 TSI108_PB_ISR_PBS_RD_ERR);
114
115 /* Clear PCI/X bus cfg errors if applicable */
116 if ((err_addr & 0xFF000000) == pci_cfg_base) {
117 pci_stat =
118 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
119 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
120 pci_stat);
121 }
122 }
123
124 return;
125 }
126
127 #define __tsi108_read_pci_config(x, addr, op) \
128 __asm__ __volatile__( \
129 " "op" %0,0,%1\n" \
130 "1: eieio\n" \
131 "2:\n" \
132 ".section .fixup,\"ax\"\n" \
133 "3: li %0,-1\n" \
134 " b 2b\n" \
135 ".section __ex_table,\"a\"\n" \
136 " .align 2\n" \
137 " .long 1b,3b\n" \
138 ".text" \
139 : "=r"(x) : "r"(addr))
140
141 int
142 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
143 int len, u32 * val)
144 {
145 volatile unsigned char *cfg_addr;
146 u32 temp;
147
148 if (ppc_md.pci_exclude_device)
149 if (ppc_md.pci_exclude_device(bus->number, devfn))
150 return PCIBIOS_DEVICE_NOT_FOUND;
151
152 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
153 devfn,
154 offset) | (offset &
155 0x03));
156
157 switch (len) {
158 case 1:
159 __tsi108_read_pci_config(temp, cfg_addr, "lbzx");
160 break;
161 case 2:
162 __tsi108_read_pci_config(temp, cfg_addr, "lhbrx");
163 break;
164 default:
165 __tsi108_read_pci_config(temp, cfg_addr, "lwbrx");
166 break;
167 }
168
169 *val = temp;
170
171 #ifdef DEBUG
172 if ((0xFFFFFFFF != temp) && (0xFFFF != temp) && (0xFF != temp)) {
173 printk("PCI CFG read : ");
174 printk("%d:0x%x:0x%x ", bus->number, devfn, offset);
175 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
176 printk("data = 0x%x\n", *val);
177 }
178 #endif
179 return PCIBIOS_SUCCESSFUL;
180 }
181
182 void tsi108_clear_pci_cfg_error(void)
183 {
184 tsi108_clear_pci_error(TSI108_PCI_CFG_BASE_PHYS);
185 }
186
187 static struct pci_ops tsi108_direct_pci_ops = {
188 tsi108_direct_read_config,
189 tsi108_direct_write_config
190 };
191
192 int __init tsi108_setup_pci(struct device_node *dev)
193 {
194 int len;
195 struct pci_controller *hose;
196 struct resource rsrc;
197 const int *bus_range;
198 int primary = 0, has_address = 0;
199
200 /* PCI Config mapping */
201 tsi108_pci_cfg_base = (u32)ioremap(TSI108_PCI_CFG_BASE_PHYS,
202 TSI108_PCI_CFG_SIZE);
203 DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __FUNCTION__,
204 tsi108_pci_cfg_base);
205
206 /* Fetch host bridge registers address */
207 has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
208
209 /* Get bus range if any */
210 bus_range = get_property(dev, "bus-range", &len);
211 if (bus_range == NULL || len < 2 * sizeof(int)) {
212 printk(KERN_WARNING "Can't get bus-range for %s, assume"
213 " bus 0\n", dev->full_name);
214 }
215
216 hose = pcibios_alloc_controller();
217
218 if (!hose) {
219 printk("PCI Host bridge init failed\n");
220 return -ENOMEM;
221 }
222 hose->arch_data = dev;
223 hose->set_cfg_type = 1;
224
225 hose->first_busno = bus_range ? bus_range[0] : 0;
226 hose->last_busno = bus_range ? bus_range[1] : 0xff;
227
228 (hose)->ops = &tsi108_direct_pci_ops;
229
230 printk(KERN_INFO "Found tsi108 PCI host bridge at 0x%08x. "
231 "Firmware bus number: %d->%d\n",
232 rsrc.start, hose->first_busno, hose->last_busno);
233
234 /* Interpret the "ranges" property */
235 /* This also maps the I/O region and sets isa_io/mem_base */
236 pci_process_bridge_OF_ranges(hose, dev, primary);
237 return 0;
238 }
239
240 /*
241 * Low level utility functions
242 */
243
244 static void tsi108_pci_int_mask(u_int irq)
245 {
246 u_int irp_cfg;
247 int int_line = (irq - IRQ_PCI_INTAD_BASE);
248
249 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
250 mb();
251 irp_cfg |= (1 << int_line); /* INTx_DIR = output */
252 irp_cfg &= ~(3 << (8 + (int_line * 2))); /* INTx_TYPE = unused */
253 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
254 mb();
255 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
256 }
257
258 static void tsi108_pci_int_unmask(u_int irq)
259 {
260 u_int irp_cfg;
261 int int_line = (irq - IRQ_PCI_INTAD_BASE);
262
263 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
264 mb();
265 irp_cfg &= ~(1 << int_line);
266 irp_cfg |= (3 << (8 + (int_line * 2)));
267 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
268 mb();
269 }
270
271 static void init_pci_source(void)
272 {
273 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL,
274 0x0000ff00);
275 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
276 TSI108_PCI_IRP_ENABLE_P_INT);
277 mb();
278 }
279
280 static inline unsigned int get_pci_source(void)
281 {
282 u_int temp = 0;
283 int irq = -1;
284 int i;
285 u_int pci_irp_stat;
286 static int mask = 0;
287
288 /* Read PCI/X block interrupt status register */
289 pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
290 mb();
291
292 if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) {
293 /* Process Interrupt from PCI bus INTA# - INTD# lines */
294 temp =
295 tsi108_read_reg(TSI108_PCI_OFFSET +
296 TSI108_PCI_IRP_INTAD) & 0xf;
297 mb();
298 for (i = 0; i < 4; i++, mask++) {
299 if (temp & (1 << mask % 4)) {
300 irq = IRQ_PCI_INTA + mask % 4;
301 mask++;
302 break;
303 }
304 }
305
306 /* Disable interrupts from PCI block */
307 temp = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
308 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
309 temp & ~TSI108_PCI_IRP_ENABLE_P_INT);
310 mb();
311 (void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
312 mb();
313 }
314 #ifdef DEBUG
315 else {
316 printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n");
317 pci_irp_stat =
318 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
319 temp =
320 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD);
321 mb();
322 printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp);
323 temp =
324 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
325 mb();
326 printk("cfg_ctl=0x%08x ", temp);
327 temp =
328 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
329 mb();
330 printk("irp_enable=0x%08x\n", temp);
331 }
332 #endif /* end of DEBUG */
333
334 return irq;
335 }
336
337
338 /*
339 * Linux descriptor level callbacks
340 */
341
342 static void tsi108_pci_irq_enable(u_int irq)
343 {
344 tsi108_pci_int_unmask(irq);
345 }
346
347 static void tsi108_pci_irq_disable(u_int irq)
348 {
349 tsi108_pci_int_mask(irq);
350 }
351
352 static void tsi108_pci_irq_ack(u_int irq)
353 {
354 tsi108_pci_int_mask(irq);
355 }
356
357 static void tsi108_pci_irq_end(u_int irq)
358 {
359 tsi108_pci_int_unmask(irq);
360
361 /* Enable interrupts from PCI block */
362 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
363 tsi108_read_reg(TSI108_PCI_OFFSET +
364 TSI108_PCI_IRP_ENABLE) |
365 TSI108_PCI_IRP_ENABLE_P_INT);
366 mb();
367 }
368
369 /*
370 * Interrupt controller descriptor for cascaded PCI interrupt controller.
371 */
372
373 static struct irq_chip tsi108_pci_irq = {
374 .typename = "tsi108_PCI_int",
375 .mask = tsi108_pci_irq_disable,
376 .ack = tsi108_pci_irq_ack,
377 .end = tsi108_pci_irq_end,
378 .unmask = tsi108_pci_irq_enable,
379 };
380
381 /*
382 * Exported functions
383 */
384
385 /*
386 * The Tsi108 PCI interrupts initialization routine.
387 *
388 * The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block
389 * to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the
390 * PCI block has to be treated as a cascaded interrupt controller connected
391 * to the MPIC.
392 */
393
394 void __init tsi108_pci_int_init(void)
395 {
396 u_int i;
397
398 DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
399
400 for (i = 0; i < NUM_PCI_IRQS; i++) {
401 irq_desc[i + IRQ_PCI_INTAD_BASE].chip = &tsi108_pci_irq;
402 irq_desc[i + IRQ_PCI_INTAD_BASE].status |= IRQ_LEVEL;
403 }
404
405 init_pci_source();
406 }
407
408 void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc)
409 {
410 unsigned int cascade_irq = get_pci_source();
411 if (cascade_irq != NO_IRQ)
412 generic_handle_irq(cascade_irq);
413 desc->chip->eoi(irq);
414 }
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