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/irq.h>
28 #include <linux/interrupt.h>
30 #include <asm/byteorder.h>
33 #include <linux/uaccess.h>
34 #include <asm/machdep.h>
35 #include <asm/pci-bridge.h>
36 #include <asm/tsi108.h>
37 #include <asm/tsi108_pci.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 static u32 tsi108_pci_cfg_phys;
53 u32 tsi108_csr_vir_base;
54 static struct irq_domain *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;
65 struct pci_controller *hose = pci_bus_to_host(bus);
67 if (ppc_md.pci_exclude_device)
68 if (ppc_md.pci_exclude_device(hose, bus->number, devfunc))
69 return PCIBIOS_DEVICE_NOT_FOUND;
71 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
76 printk("PCI CFG write : ");
77 printk("%d:0x%x:0x%x ", bus->number, devfunc, offset);
78 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
79 printk("data = 0x%08x\n", val);
84 out_8((u8 *) cfg_addr, val);
87 out_le16((u16 *) cfg_addr, val);
90 out_le32((u32 *) cfg_addr, val);
94 return PCIBIOS_SUCCESSFUL;
97 void tsi108_clear_pci_error(u32 pci_cfg_base)
99 u32 err_stat, err_addr, pci_stat;
102 * Quietly clear PB and PCI error flags set as result
103 * of PCI/X configuration read requests.
106 /* Read PB Error Log Registers */
108 err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
109 err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
111 if (err_stat & TSI108_PB_ERRCS_ES) {
112 /* Clear error flag */
113 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
116 /* Clear read error reported in PB_ISR */
117 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR,
118 TSI108_PB_ISR_PBS_RD_ERR);
120 /* Clear PCI/X bus cfg errors if applicable */
121 if ((err_addr & 0xFF000000) == pci_cfg_base) {
123 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
124 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
132 #define __tsi108_read_pci_config(x, addr, op) \
133 __asm__ __volatile__( \
137 ".section .fixup,\"ax\"\n" \
142 : "=r"(x) : "r"(addr))
145 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
148 volatile unsigned char *cfg_addr;
149 struct pci_controller *hose = pci_bus_to_host(bus);
152 if (ppc_md.pci_exclude_device)
153 if (ppc_md.pci_exclude_device(hose, 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_phys);
191 static struct pci_ops tsi108_direct_pci_ops = {
192 .read = tsi108_direct_read_config,
193 .write = tsi108_direct_write_config,
196 int __init tsi108_setup_pci(struct device_node *dev, u32 cfg_phys, int primary)
199 struct pci_controller *hose;
200 struct resource rsrc;
201 const int *bus_range;
204 /* PCI Config mapping */
205 tsi108_pci_cfg_base = (u32)ioremap(cfg_phys, TSI108_PCI_CFG_SIZE);
206 tsi108_pci_cfg_phys = cfg_phys;
207 DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __func__,
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 = of_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(dev);
223 printk("PCI Host bridge init failed\n");
227 hose->first_busno = bus_range ? bus_range[0] : 0;
228 hose->last_busno = bus_range ? bus_range[1] : 0xff;
230 (hose)->ops = &tsi108_direct_pci_ops;
232 printk(KERN_INFO "Found tsi108 PCI host bridge at 0x%08x. "
233 "Firmware bus number: %d->%d\n",
234 rsrc.start, hose->first_busno, hose->last_busno);
236 /* Interpret the "ranges" property */
237 /* This also maps the I/O region and sets isa_io/mem_base */
238 pci_process_bridge_OF_ranges(hose, dev, primary);
243 * Low level utility functions
246 static void tsi108_pci_int_mask(u_int irq)
249 int int_line = (irq - IRQ_PCI_INTAD_BASE);
251 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
253 irp_cfg |= (1 << int_line); /* INTx_DIR = output */
254 irp_cfg &= ~(3 << (8 + (int_line * 2))); /* INTx_TYPE = unused */
255 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
257 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
260 static void tsi108_pci_int_unmask(u_int irq)
263 int int_line = (irq - IRQ_PCI_INTAD_BASE);
265 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
267 irp_cfg &= ~(1 << int_line);
268 irp_cfg |= (3 << (8 + (int_line * 2)));
269 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
273 static void init_pci_source(void)
275 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL,
277 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
278 TSI108_PCI_IRP_ENABLE_P_INT);
282 static inline unsigned int get_pci_source(void)
290 /* Read PCI/X block interrupt status register */
291 pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
294 if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) {
295 /* Process Interrupt from PCI bus INTA# - INTD# lines */
297 tsi108_read_reg(TSI108_PCI_OFFSET +
298 TSI108_PCI_IRP_INTAD) & 0xf;
300 for (i = 0; i < 4; i++, mask++) {
301 if (temp & (1 << mask % 4)) {
302 irq = IRQ_PCI_INTA + mask % 4;
308 /* Disable interrupts from PCI block */
309 temp = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
310 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
311 temp & ~TSI108_PCI_IRP_ENABLE_P_INT);
313 (void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
318 printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n");
320 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
322 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD);
324 printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp);
326 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
328 printk("cfg_ctl=0x%08x ", temp);
330 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
332 printk("irp_enable=0x%08x\n", temp);
334 #endif /* end of DEBUG */
341 * Linux descriptor level callbacks
344 static void tsi108_pci_irq_unmask(struct irq_data *d)
346 tsi108_pci_int_unmask(d->irq);
348 /* Enable interrupts from PCI block */
349 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
350 tsi108_read_reg(TSI108_PCI_OFFSET +
351 TSI108_PCI_IRP_ENABLE) |
352 TSI108_PCI_IRP_ENABLE_P_INT);
356 static void tsi108_pci_irq_mask(struct irq_data *d)
358 tsi108_pci_int_mask(d->irq);
361 static void tsi108_pci_irq_ack(struct irq_data *d)
363 tsi108_pci_int_mask(d->irq);
367 * Interrupt controller descriptor for cascaded PCI interrupt controller.
370 static struct irq_chip tsi108_pci_irq = {
371 .name = "tsi108_PCI_int",
372 .irq_mask = tsi108_pci_irq_mask,
373 .irq_ack = tsi108_pci_irq_ack,
374 .irq_unmask = tsi108_pci_irq_unmask,
377 static int pci_irq_host_xlate(struct irq_domain *h, struct device_node *ct,
378 const u32 *intspec, unsigned int intsize,
379 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
381 *out_hwirq = intspec[0];
382 *out_flags = IRQ_TYPE_LEVEL_HIGH;
386 static int pci_irq_host_map(struct irq_domain *h, unsigned int virq,
389 DBG("%s(%d, 0x%lx)\n", __func__, virq, hw);
390 if ((virq >= 1) && (virq <= 4)){
391 irq = virq + IRQ_PCI_INTAD_BASE - 1;
392 irq_set_status_flags(irq, IRQ_LEVEL);
393 irq_set_chip(irq, &tsi108_pci_irq);
398 static const struct irq_domain_ops pci_irq_domain_ops = {
399 .map = pci_irq_host_map,
400 .xlate = pci_irq_host_xlate,
408 * The Tsi108 PCI interrupts initialization routine.
410 * The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block
411 * to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the
412 * PCI block has to be treated as a cascaded interrupt controller connected
416 void __init tsi108_pci_int_init(struct device_node *node)
418 DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
420 pci_irq_host = irq_domain_add_legacy_isa(node, &pci_irq_domain_ops, NULL);
421 if (pci_irq_host == NULL) {
422 printk(KERN_ERR "pci_irq_host: failed to allocate irq domain!\n");
429 void tsi108_irq_cascade(struct irq_desc *desc)
431 struct irq_chip *chip = irq_desc_get_chip(desc);
432 unsigned int cascade_irq = get_pci_source();
435 generic_handle_irq(cascade_irq);
437 chip->irq_eoi(&desc->irq_data);