2 * Common routines for Tundra Semiconductor TSI108 host bridge.
4 * 2004-2005 (c) Tundra Semiconductor Corp.
5 * Author: Alex Bounine (alexandreb@tundra.com)
6 * Author: Roy Zang (tie-fei.zang@freescale.com)
7 * Add pci interrupt router host
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 * You should have received a copy of the GNU General Public License along with
20 * this program; if not, write to the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/kernel.h>
25 #include <linux/init.h>
26 #include <linux/pci.h>
27 #include <linux/slab.h>
28 #include <linux/irq.h>
29 #include <linux/interrupt.h>
31 #include <asm/byteorder.h>
34 #include <asm/uaccess.h>
35 #include <asm/machdep.h>
36 #include <asm/pci-bridge.h>
37 #include <asm/tsi108.h>
38 #include <asm/tsi108_pci.h>
39 #include <asm/tsi108_irq.h>
44 #define DBG(x...) printk(x)
49 #define tsi_mk_config_addr(bus, devfunc, offset) \
50 ((((bus)<<16) | ((devfunc)<<8) | (offset & 0xfc)) + tsi108_pci_cfg_base)
52 u32 tsi108_pci_cfg_base;
53 static u32 tsi108_pci_cfg_phys;
54 u32 tsi108_csr_vir_base;
55 static struct irq_host *pci_irq_host;
57 extern u32 get_vir_csrbase(void);
58 extern u32 tsi108_read_reg(u32 reg_offset);
59 extern void tsi108_write_reg(u32 reg_offset, u32 val);
62 tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc,
63 int offset, int len, u32 val)
65 volatile unsigned char *cfg_addr;
66 struct pci_controller *hose = bus->sysdata;
68 if (ppc_md.pci_exclude_device)
69 if (ppc_md.pci_exclude_device(hose, bus->number, devfunc))
70 return PCIBIOS_DEVICE_NOT_FOUND;
72 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
77 printk("PCI CFG write : ");
78 printk("%d:0x%x:0x%x ", bus->number, devfunc, offset);
79 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
80 printk("data = 0x%08x\n", val);
85 out_8((u8 *) cfg_addr, val);
88 out_le16((u16 *) cfg_addr, val);
91 out_le32((u32 *) cfg_addr, val);
95 return PCIBIOS_SUCCESSFUL;
98 void tsi108_clear_pci_error(u32 pci_cfg_base)
100 u32 err_stat, err_addr, pci_stat;
103 * Quietly clear PB and PCI error flags set as result
104 * of PCI/X configuration read requests.
107 /* Read PB Error Log Registers */
109 err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
110 err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
112 if (err_stat & TSI108_PB_ERRCS_ES) {
113 /* Clear error flag */
114 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
117 /* Clear read error reported in PB_ISR */
118 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR,
119 TSI108_PB_ISR_PBS_RD_ERR);
121 /* Clear PCI/X bus cfg errors if applicable */
122 if ((err_addr & 0xFF000000) == pci_cfg_base) {
124 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
125 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
133 #define __tsi108_read_pci_config(x, addr, op) \
134 __asm__ __volatile__( \
138 ".section .fixup,\"ax\"\n" \
141 ".section __ex_table,\"a\"\n" \
145 : "=r"(x) : "r"(addr))
148 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
151 volatile unsigned char *cfg_addr;
152 struct pci_controller *hose = bus->sysdata;
155 if (ppc_md.pci_exclude_device)
156 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
157 return PCIBIOS_DEVICE_NOT_FOUND;
159 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
166 __tsi108_read_pci_config(temp, cfg_addr, "lbzx");
169 __tsi108_read_pci_config(temp, cfg_addr, "lhbrx");
172 __tsi108_read_pci_config(temp, cfg_addr, "lwbrx");
179 if ((0xFFFFFFFF != temp) && (0xFFFF != temp) && (0xFF != temp)) {
180 printk("PCI CFG read : ");
181 printk("%d:0x%x:0x%x ", bus->number, devfn, offset);
182 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
183 printk("data = 0x%x\n", *val);
186 return PCIBIOS_SUCCESSFUL;
189 void tsi108_clear_pci_cfg_error(void)
191 tsi108_clear_pci_error(tsi108_pci_cfg_phys);
194 static struct pci_ops tsi108_direct_pci_ops = {
195 .read = tsi108_direct_read_config,
196 .write = tsi108_direct_write_config,
199 int __init tsi108_setup_pci(struct device_node *dev, u32 cfg_phys, int primary)
202 struct pci_controller *hose;
203 struct resource rsrc;
204 const int *bus_range;
207 /* PCI Config mapping */
208 tsi108_pci_cfg_base = (u32)ioremap(cfg_phys, TSI108_PCI_CFG_SIZE);
209 tsi108_pci_cfg_phys = cfg_phys;
210 DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __func__,
211 tsi108_pci_cfg_base);
213 /* Fetch host bridge registers address */
214 has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
216 /* Get bus range if any */
217 bus_range = of_get_property(dev, "bus-range", &len);
218 if (bus_range == NULL || len < 2 * sizeof(int)) {
219 printk(KERN_WARNING "Can't get bus-range for %s, assume"
220 " bus 0\n", dev->full_name);
223 hose = pcibios_alloc_controller(dev);
226 printk("PCI Host bridge init failed\n");
230 hose->first_busno = bus_range ? bus_range[0] : 0;
231 hose->last_busno = bus_range ? bus_range[1] : 0xff;
233 (hose)->ops = &tsi108_direct_pci_ops;
235 printk(KERN_INFO "Found tsi108 PCI host bridge at 0x%08x. "
236 "Firmware bus number: %d->%d\n",
237 rsrc.start, hose->first_busno, hose->last_busno);
239 /* Interpret the "ranges" property */
240 /* This also maps the I/O region and sets isa_io/mem_base */
241 pci_process_bridge_OF_ranges(hose, dev, primary);
246 * Low level utility functions
249 static void tsi108_pci_int_mask(u_int irq)
252 int int_line = (irq - IRQ_PCI_INTAD_BASE);
254 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
256 irp_cfg |= (1 << int_line); /* INTx_DIR = output */
257 irp_cfg &= ~(3 << (8 + (int_line * 2))); /* INTx_TYPE = unused */
258 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
260 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
263 static void tsi108_pci_int_unmask(u_int irq)
266 int int_line = (irq - IRQ_PCI_INTAD_BASE);
268 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
270 irp_cfg &= ~(1 << int_line);
271 irp_cfg |= (3 << (8 + (int_line * 2)));
272 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
276 static void init_pci_source(void)
278 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL,
280 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
281 TSI108_PCI_IRP_ENABLE_P_INT);
285 static inline unsigned int get_pci_source(void)
293 /* Read PCI/X block interrupt status register */
294 pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
297 if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) {
298 /* Process Interrupt from PCI bus INTA# - INTD# lines */
300 tsi108_read_reg(TSI108_PCI_OFFSET +
301 TSI108_PCI_IRP_INTAD) & 0xf;
303 for (i = 0; i < 4; i++, mask++) {
304 if (temp & (1 << mask % 4)) {
305 irq = IRQ_PCI_INTA + mask % 4;
311 /* Disable interrupts from PCI block */
312 temp = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
313 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
314 temp & ~TSI108_PCI_IRP_ENABLE_P_INT);
316 (void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
321 printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n");
323 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
325 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD);
327 printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp);
329 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
331 printk("cfg_ctl=0x%08x ", temp);
333 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
335 printk("irp_enable=0x%08x\n", temp);
337 #endif /* end of DEBUG */
344 * Linux descriptor level callbacks
347 static void tsi108_pci_irq_enable(u_int irq)
349 tsi108_pci_int_unmask(irq);
352 static void tsi108_pci_irq_disable(u_int irq)
354 tsi108_pci_int_mask(irq);
357 static void tsi108_pci_irq_ack(u_int irq)
359 tsi108_pci_int_mask(irq);
362 static void tsi108_pci_irq_end(u_int irq)
364 tsi108_pci_int_unmask(irq);
366 /* Enable interrupts from PCI block */
367 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
368 tsi108_read_reg(TSI108_PCI_OFFSET +
369 TSI108_PCI_IRP_ENABLE) |
370 TSI108_PCI_IRP_ENABLE_P_INT);
375 * Interrupt controller descriptor for cascaded PCI interrupt controller.
378 static struct irq_chip tsi108_pci_irq = {
379 .typename = "tsi108_PCI_int",
380 .mask = tsi108_pci_irq_disable,
381 .ack = tsi108_pci_irq_ack,
382 .end = tsi108_pci_irq_end,
383 .unmask = tsi108_pci_irq_enable,
386 static int pci_irq_host_xlate(struct irq_host *h, struct device_node *ct,
387 u32 *intspec, unsigned int intsize,
388 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
390 *out_hwirq = intspec[0];
391 *out_flags = IRQ_TYPE_LEVEL_HIGH;
395 static int pci_irq_host_map(struct irq_host *h, unsigned int virq,
398 DBG("%s(%d, 0x%lx)\n", __func__, virq, hw);
399 if ((virq >= 1) && (virq <= 4)){
400 irq = virq + IRQ_PCI_INTAD_BASE - 1;
401 get_irq_desc(irq)->status |= IRQ_LEVEL;
402 set_irq_chip(irq, &tsi108_pci_irq);
407 static struct irq_host_ops pci_irq_host_ops = {
408 .map = pci_irq_host_map,
409 .xlate = pci_irq_host_xlate,
417 * The Tsi108 PCI interrupts initialization routine.
419 * The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block
420 * to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the
421 * PCI block has to be treated as a cascaded interrupt controller connected
425 void __init tsi108_pci_int_init(struct device_node *node)
427 DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
429 pci_irq_host = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LEGACY,
430 0, &pci_irq_host_ops, 0);
431 if (pci_irq_host == NULL) {
432 printk(KERN_ERR "pci_irq_host: failed to allocate irq host !\n");
440 void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc)
442 unsigned int cascade_irq = get_pci_source();
443 if (cascade_irq != NO_IRQ)
444 generic_handle_irq(cascade_irq);
445 desc->chip->eoi(irq);