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_irq.h>
43 #define DBG(x...) printk(x)
48 #define tsi_mk_config_addr(bus, devfunc, offset) \
49 ((((bus)<<16) | ((devfunc)<<8) | (offset & 0xfc)) + tsi108_pci_cfg_base)
51 u32 tsi108_pci_cfg_base;
52 u32 tsi108_csr_vir_base;
53 static struct device_node *pci_irq_node;
54 static struct irq_host *pci_irq_host;
56 extern u32 get_vir_csrbase(void);
57 extern u32 tsi108_read_reg(u32 reg_offset);
58 extern void tsi108_write_reg(u32 reg_offset, u32 val);
61 tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc,
62 int offset, int len, u32 val)
64 volatile unsigned char *cfg_addr;
66 if (ppc_md.pci_exclude_device)
67 if (ppc_md.pci_exclude_device(bus->number, devfunc))
68 return PCIBIOS_DEVICE_NOT_FOUND;
70 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
75 printk("PCI CFG write : ");
76 printk("%d:0x%x:0x%x ", bus->number, devfunc, offset);
77 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
78 printk("data = 0x%08x\n", val);
83 out_8((u8 *) cfg_addr, val);
86 out_le16((u16 *) cfg_addr, val);
89 out_le32((u32 *) cfg_addr, val);
93 return PCIBIOS_SUCCESSFUL;
96 void tsi108_clear_pci_error(u32 pci_cfg_base)
98 u32 err_stat, err_addr, pci_stat;
101 * Quietly clear PB and PCI error flags set as result
102 * of PCI/X configuration read requests.
105 /* Read PB Error Log Registers */
107 err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
108 err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
110 if (err_stat & TSI108_PB_ERRCS_ES) {
111 /* Clear error flag */
112 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
115 /* Clear read error reported in PB_ISR */
116 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR,
117 TSI108_PB_ISR_PBS_RD_ERR);
119 /* Clear PCI/X bus cfg errors if applicable */
120 if ((err_addr & 0xFF000000) == pci_cfg_base) {
122 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
123 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
131 #define __tsi108_read_pci_config(x, addr, op) \
132 __asm__ __volatile__( \
136 ".section .fixup,\"ax\"\n" \
139 ".section __ex_table,\"a\"\n" \
143 : "=r"(x) : "r"(addr))
146 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
149 volatile unsigned char *cfg_addr;
152 if (ppc_md.pci_exclude_device)
153 if (ppc_md.pci_exclude_device(bus->number, devfn))
154 return PCIBIOS_DEVICE_NOT_FOUND;
156 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
163 __tsi108_read_pci_config(temp, cfg_addr, "lbzx");
166 __tsi108_read_pci_config(temp, cfg_addr, "lhbrx");
169 __tsi108_read_pci_config(temp, cfg_addr, "lwbrx");
176 if ((0xFFFFFFFF != temp) && (0xFFFF != temp) && (0xFF != temp)) {
177 printk("PCI CFG read : ");
178 printk("%d:0x%x:0x%x ", bus->number, devfn, offset);
179 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
180 printk("data = 0x%x\n", *val);
183 return PCIBIOS_SUCCESSFUL;
186 void tsi108_clear_pci_cfg_error(void)
188 tsi108_clear_pci_error(TSI108_PCI_CFG_BASE_PHYS);
191 static struct pci_ops tsi108_direct_pci_ops = {
192 tsi108_direct_read_config,
193 tsi108_direct_write_config
196 int __init tsi108_setup_pci(struct device_node *dev)
199 struct pci_controller *hose;
200 struct resource rsrc;
201 const int *bus_range;
202 int primary = 0, has_address = 0;
204 /* PCI Config mapping */
205 tsi108_pci_cfg_base = (u32)ioremap(TSI108_PCI_CFG_BASE_PHYS,
206 TSI108_PCI_CFG_SIZE);
207 DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __FUNCTION__,
208 tsi108_pci_cfg_base);
210 /* Fetch host bridge registers address */
211 has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
213 /* Get bus range if any */
214 bus_range = get_property(dev, "bus-range", &len);
215 if (bus_range == NULL || len < 2 * sizeof(int)) {
216 printk(KERN_WARNING "Can't get bus-range for %s, assume"
217 " bus 0\n", dev->full_name);
220 hose = pcibios_alloc_controller();
223 printk("PCI Host bridge init failed\n");
226 hose->arch_data = dev;
227 hose->set_cfg_type = 1;
229 hose->first_busno = bus_range ? bus_range[0] : 0;
230 hose->last_busno = bus_range ? bus_range[1] : 0xff;
232 (hose)->ops = &tsi108_direct_pci_ops;
234 printk(KERN_INFO "Found tsi108 PCI host bridge at 0x%08x. "
235 "Firmware bus number: %d->%d\n",
236 rsrc.start, hose->first_busno, hose->last_busno);
238 /* Interpret the "ranges" property */
239 /* This also maps the I/O region and sets isa_io/mem_base */
240 pci_process_bridge_OF_ranges(hose, dev, primary);
245 * Low level utility functions
248 static void tsi108_pci_int_mask(u_int irq)
251 int int_line = (irq - IRQ_PCI_INTAD_BASE);
253 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
255 irp_cfg |= (1 << int_line); /* INTx_DIR = output */
256 irp_cfg &= ~(3 << (8 + (int_line * 2))); /* INTx_TYPE = unused */
257 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
259 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
262 static void tsi108_pci_int_unmask(u_int irq)
265 int int_line = (irq - IRQ_PCI_INTAD_BASE);
267 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
269 irp_cfg &= ~(1 << int_line);
270 irp_cfg |= (3 << (8 + (int_line * 2)));
271 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
275 static void init_pci_source(void)
277 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL,
279 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
280 TSI108_PCI_IRP_ENABLE_P_INT);
284 static inline unsigned int get_pci_source(void)
292 /* Read PCI/X block interrupt status register */
293 pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
296 if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) {
297 /* Process Interrupt from PCI bus INTA# - INTD# lines */
299 tsi108_read_reg(TSI108_PCI_OFFSET +
300 TSI108_PCI_IRP_INTAD) & 0xf;
302 for (i = 0; i < 4; i++, mask++) {
303 if (temp & (1 << mask % 4)) {
304 irq = IRQ_PCI_INTA + mask % 4;
310 /* Disable interrupts from PCI block */
311 temp = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
312 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
313 temp & ~TSI108_PCI_IRP_ENABLE_P_INT);
315 (void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
320 printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n");
322 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
324 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD);
326 printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp);
328 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
330 printk("cfg_ctl=0x%08x ", temp);
332 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
334 printk("irp_enable=0x%08x\n", temp);
336 #endif /* end of DEBUG */
343 * Linux descriptor level callbacks
346 static void tsi108_pci_irq_enable(u_int irq)
348 tsi108_pci_int_unmask(irq);
351 static void tsi108_pci_irq_disable(u_int irq)
353 tsi108_pci_int_mask(irq);
356 static void tsi108_pci_irq_ack(u_int irq)
358 tsi108_pci_int_mask(irq);
361 static void tsi108_pci_irq_end(u_int irq)
363 tsi108_pci_int_unmask(irq);
365 /* Enable interrupts from PCI block */
366 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
367 tsi108_read_reg(TSI108_PCI_OFFSET +
368 TSI108_PCI_IRP_ENABLE) |
369 TSI108_PCI_IRP_ENABLE_P_INT);
374 * Interrupt controller descriptor for cascaded PCI interrupt controller.
377 static struct irq_chip tsi108_pci_irq = {
378 .typename = "tsi108_PCI_int",
379 .mask = tsi108_pci_irq_disable,
380 .ack = tsi108_pci_irq_ack,
381 .end = tsi108_pci_irq_end,
382 .unmask = tsi108_pci_irq_enable,
385 static int pci_irq_host_xlate(struct irq_host *h, struct device_node *ct,
386 u32 *intspec, unsigned int intsize,
387 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
389 *out_hwirq = intspec[0];
390 *out_flags = IRQ_TYPE_LEVEL_HIGH;
394 static int pci_irq_host_map(struct irq_host *h, unsigned int virq,
397 DBG("%s(%d, 0x%lx)\n", __FUNCTION__, virq, hw);
398 if ((virq >= 1) && (virq <= 4)){
399 irq = virq + IRQ_PCI_INTAD_BASE - 1;
400 get_irq_desc(irq)->status |= IRQ_LEVEL;
401 set_irq_chip(irq, &tsi108_pci_irq);
406 static int pci_irq_host_match(struct irq_host *h, struct device_node *node)
408 return pci_irq_node == node;
411 static struct irq_host_ops pci_irq_host_ops = {
412 .match = pci_irq_host_match,
413 .map = pci_irq_host_map,
414 .xlate = pci_irq_host_xlate,
422 * The Tsi108 PCI interrupts initialization routine.
424 * The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block
425 * to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the
426 * PCI block has to be treated as a cascaded interrupt controller connected
430 void __init tsi108_pci_int_init(struct device_node *node)
432 DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
434 pci_irq_node = of_node_get(node);
435 pci_irq_host = irq_alloc_host(IRQ_HOST_MAP_LEGACY, 0, &pci_irq_host_ops, 0);
436 if (pci_irq_host == NULL) {
437 printk(KERN_ERR "pci_irq_host: failed to allocate irq host !\n");
444 void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc)
446 unsigned int cascade_irq = get_pci_source();
447 if (cascade_irq != NO_IRQ)
448 generic_handle_irq(cascade_irq);
449 desc->chip->eoi(irq);