2 * Common routines for Tundra Semiconductor TSI108 host bridge.
4 * 2004-2005 (c) Tundra Semiconductor Corp.
5 * Author: Alex Bounine (alexandreb@tundra.com)
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)
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
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.
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>
29 #include <asm/byteorder.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>
41 #define DBG(x...) printk(x)
46 #define tsi_mk_config_addr(bus, devfunc, offset) \
47 ((((bus)<<16) | ((devfunc)<<8) | (offset & 0xfc)) + tsi108_pci_cfg_base)
49 u32 tsi108_pci_cfg_base;
50 u32 tsi108_csr_vir_base;
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);
57 tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc,
58 int offset, int len, u32 val)
60 volatile unsigned char *cfg_addr;
62 if (ppc_md.pci_exclude_device)
63 if (ppc_md.pci_exclude_device(bus->number, devfunc))
64 return PCIBIOS_DEVICE_NOT_FOUND;
66 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
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);
79 out_8((u8 *) cfg_addr, val);
82 out_le16((u16 *) cfg_addr, val);
85 out_le32((u32 *) cfg_addr, val);
89 return PCIBIOS_SUCCESSFUL;
92 void tsi108_clear_pci_error(u32 pci_cfg_base)
94 u32 err_stat, err_addr, pci_stat;
97 * Quietly clear PB and PCI error flags set as result
98 * of PCI/X configuration read requests.
101 /* Read PB Error Log Registers */
103 err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
104 err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
106 if (err_stat & TSI108_PB_ERRCS_ES) {
107 /* Clear error flag */
108 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
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);
115 /* Clear PCI/X bus cfg errors if applicable */
116 if ((err_addr & 0xFF000000) == pci_cfg_base) {
118 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
119 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
127 #define __tsi108_read_pci_config(x, addr, op) \
128 __asm__ __volatile__( \
132 ".section .fixup,\"ax\"\n" \
135 ".section __ex_table,\"a\"\n" \
139 : "=r"(x) : "r"(addr))
142 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
145 volatile unsigned char *cfg_addr;
148 if (ppc_md.pci_exclude_device)
149 if (ppc_md.pci_exclude_device(bus->number, devfn))
150 return PCIBIOS_DEVICE_NOT_FOUND;
152 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
159 __tsi108_read_pci_config(temp, cfg_addr, "lbzx");
162 __tsi108_read_pci_config(temp, cfg_addr, "lhbrx");
165 __tsi108_read_pci_config(temp, cfg_addr, "lwbrx");
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);
179 return PCIBIOS_SUCCESSFUL;
182 void tsi108_clear_pci_cfg_error(void)
184 tsi108_clear_pci_error(TSI108_PCI_CFG_BASE_PHYS);
187 static struct pci_ops tsi108_direct_pci_ops = {
188 tsi108_direct_read_config,
189 tsi108_direct_write_config
192 int __init tsi108_setup_pci(struct device_node *dev)
195 struct pci_controller *hose;
196 struct resource rsrc;
197 const int *bus_range;
198 int primary = 0, has_address = 0;
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);
206 /* Fetch host bridge registers address */
207 has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
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);
216 hose = pcibios_alloc_controller();
219 printk("PCI Host bridge init failed\n");
222 hose->arch_data = dev;
223 hose->set_cfg_type = 1;
225 hose->first_busno = bus_range ? bus_range[0] : 0;
226 hose->last_busno = bus_range ? bus_range[1] : 0xff;
228 (hose)->ops = &tsi108_direct_pci_ops;
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);
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);
241 * Low level utility functions
244 static void tsi108_pci_int_mask(u_int irq)
247 int int_line = (irq - IRQ_PCI_INTAD_BASE);
249 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
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);
255 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
258 static void tsi108_pci_int_unmask(u_int irq)
261 int int_line = (irq - IRQ_PCI_INTAD_BASE);
263 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
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);
271 static void init_pci_source(void)
273 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL,
275 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
276 TSI108_PCI_IRP_ENABLE_P_INT);
280 static inline unsigned int get_pci_source(void)
288 /* Read PCI/X block interrupt status register */
289 pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
292 if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) {
293 /* Process Interrupt from PCI bus INTA# - INTD# lines */
295 tsi108_read_reg(TSI108_PCI_OFFSET +
296 TSI108_PCI_IRP_INTAD) & 0xf;
298 for (i = 0; i < 4; i++, mask++) {
299 if (temp & (1 << mask % 4)) {
300 irq = IRQ_PCI_INTA + mask % 4;
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);
311 (void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
316 printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n");
318 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
320 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD);
322 printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp);
324 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
326 printk("cfg_ctl=0x%08x ", temp);
328 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
330 printk("irp_enable=0x%08x\n", temp);
332 #endif /* end of DEBUG */
339 * Linux descriptor level callbacks
342 static void tsi108_pci_irq_enable(u_int irq)
344 tsi108_pci_int_unmask(irq);
347 static void tsi108_pci_irq_disable(u_int irq)
349 tsi108_pci_int_mask(irq);
352 static void tsi108_pci_irq_ack(u_int irq)
354 tsi108_pci_int_mask(irq);
357 static void tsi108_pci_irq_end(u_int irq)
359 tsi108_pci_int_unmask(irq);
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);
370 * Interrupt controller descriptor for cascaded PCI interrupt controller.
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,
386 * The Tsi108 PCI interrupts initialization routine.
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
394 void __init tsi108_pci_int_init(void)
398 DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
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;
408 void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc,
409 struct pt_regs *regs)
411 unsigned int cascade_irq = get_pci_source();
412 if (cascade_irq != NO_IRQ)
413 generic_handle_irq(cascade_irq, regs);
414 desc->chip->eoi(irq);