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>
30 #include <asm/byteorder.h>
33 #include <asm/uaccess.h>
34 #include <asm/machdep.h>
35 #include <asm/pci-bridge.h>
36 #include <asm/tsi108.h>
37 #include <asm/tsi108_irq.h>
42 #define DBG(x...) printk(x)
47 #define tsi_mk_config_addr(bus, devfunc, offset) \
48 ((((bus)<<16) | ((devfunc)<<8) | (offset & 0xfc)) + tsi108_pci_cfg_base)
50 u32 tsi108_pci_cfg_base;
51 u32 tsi108_csr_vir_base;
53 extern u32 get_vir_csrbase(void);
54 extern u32 tsi108_read_reg(u32 reg_offset);
55 extern void tsi108_write_reg(u32 reg_offset, u32 val);
58 tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc,
59 int offset, int len, u32 val)
61 volatile unsigned char *cfg_addr;
63 if (ppc_md.pci_exclude_device)
64 if (ppc_md.pci_exclude_device(bus->number, devfunc))
65 return PCIBIOS_DEVICE_NOT_FOUND;
67 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
72 printk("PCI CFG write : ");
73 printk("%d:0x%x:0x%x ", bus->number, devfunc, offset);
74 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
75 printk("data = 0x%08x\n", val);
80 out_8((u8 *) cfg_addr, val);
83 out_le16((u16 *) cfg_addr, val);
86 out_le32((u32 *) cfg_addr, val);
90 return PCIBIOS_SUCCESSFUL;
93 void tsi108_clear_pci_error(u32 pci_cfg_base)
95 u32 err_stat, err_addr, pci_stat;
98 * Quietly clear PB and PCI error flags set as result
99 * of PCI/X configuration read requests.
102 /* Read PB Error Log Registers */
104 err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
105 err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
107 if (err_stat & TSI108_PB_ERRCS_ES) {
108 /* Clear error flag */
109 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
112 /* Clear read error reported in PB_ISR */
113 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR,
114 TSI108_PB_ISR_PBS_RD_ERR);
116 /* Clear PCI/X bus cfg errors if applicable */
117 if ((err_addr & 0xFF000000) == pci_cfg_base) {
119 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
120 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
128 #define __tsi108_read_pci_config(x, addr, op) \
129 __asm__ __volatile__( \
133 ".section .fixup,\"ax\"\n" \
136 ".section __ex_table,\"a\"\n" \
140 : "=r"(x) : "r"(addr))
143 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
146 volatile unsigned char *cfg_addr;
149 if (ppc_md.pci_exclude_device)
150 if (ppc_md.pci_exclude_device(bus->number, devfn))
151 return PCIBIOS_DEVICE_NOT_FOUND;
153 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
160 __tsi108_read_pci_config(temp, cfg_addr, "lbzx");
163 __tsi108_read_pci_config(temp, cfg_addr, "lhbrx");
166 __tsi108_read_pci_config(temp, cfg_addr, "lwbrx");
173 if ((0xFFFFFFFF != temp) && (0xFFFF != temp) && (0xFF != temp)) {
174 printk("PCI CFG read : ");
175 printk("%d:0x%x:0x%x ", bus->number, devfn, offset);
176 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
177 printk("data = 0x%x\n", *val);
180 return PCIBIOS_SUCCESSFUL;
183 void tsi108_clear_pci_cfg_error(void)
185 tsi108_clear_pci_error(TSI108_PCI_CFG_BASE_PHYS);
188 static struct pci_ops tsi108_direct_pci_ops = {
189 tsi108_direct_read_config,
190 tsi108_direct_write_config
193 int __init tsi108_setup_pci(struct device_node *dev)
196 struct pci_controller *hose;
197 struct resource rsrc;
199 int primary = 0, has_address = 0;
201 /* PCI Config mapping */
202 tsi108_pci_cfg_base = (u32)ioremap(TSI108_PCI_CFG_BASE_PHYS,
203 TSI108_PCI_CFG_SIZE);
204 DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __FUNCTION__,
205 tsi108_pci_cfg_base);
207 /* Fetch host bridge registers address */
208 has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
210 /* Get bus range if any */
211 bus_range = (int *)get_property(dev, "bus-range", &len);
212 if (bus_range == NULL || len < 2 * sizeof(int)) {
213 printk(KERN_WARNING "Can't get bus-range for %s, assume"
214 " bus 0\n", dev->full_name);
217 hose = pcibios_alloc_controller();
220 printk("PCI Host bridge init failed\n");
223 hose->arch_data = dev;
224 hose->set_cfg_type = 1;
226 hose->first_busno = bus_range ? bus_range[0] : 0;
227 hose->last_busno = bus_range ? bus_range[1] : 0xff;
229 (hose)->ops = &tsi108_direct_pci_ops;
231 printk(KERN_INFO "Found tsi108 PCI host bridge at 0x%08lx. "
232 "Firmware bus number: %d->%d\n",
233 rsrc.start, hose->first_busno, hose->last_busno);
235 /* Interpret the "ranges" property */
236 /* This also maps the I/O region and sets isa_io/mem_base */
237 pci_process_bridge_OF_ranges(hose, dev, primary);
242 * Low level utility functions
245 static void tsi108_pci_int_mask(u_int irq)
248 int int_line = (irq - IRQ_PCI_INTAD_BASE);
250 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
252 irp_cfg |= (1 << int_line); /* INTx_DIR = output */
253 irp_cfg &= ~(3 << (8 + (int_line * 2))); /* INTx_TYPE = unused */
254 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
256 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
259 static void tsi108_pci_int_unmask(u_int irq)
262 int int_line = (irq - IRQ_PCI_INTAD_BASE);
264 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
266 irp_cfg &= ~(1 << int_line);
267 irp_cfg |= (3 << (8 + (int_line * 2)));
268 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg);
272 static void init_pci_source(void)
274 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL,
276 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
277 TSI108_PCI_IRP_ENABLE_P_INT);
281 static inline int get_pci_source(void)
289 /* Read PCI/X block interrupt status register */
290 pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
293 if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) {
294 /* Process Interrupt from PCI bus INTA# - INTD# lines */
296 tsi108_read_reg(TSI108_PCI_OFFSET +
297 TSI108_PCI_IRP_INTAD) & 0xf;
299 for (i = 0; i < 4; i++, mask++) {
300 if (temp & (1 << mask % 4)) {
301 irq = IRQ_PCI_INTA + mask % 4;
307 /* Disable interrupts from PCI block */
308 temp = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
309 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
310 temp & ~TSI108_PCI_IRP_ENABLE_P_INT);
312 (void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
317 printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n");
319 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT);
321 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD);
323 printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp);
325 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL);
327 printk("cfg_ctl=0x%08x ", temp);
329 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE);
331 printk("irp_enable=0x%08x\n", temp);
333 #endif /* end of DEBUG */
340 * Linux descriptor level callbacks
343 static void tsi108_pci_irq_enable(u_int irq)
345 tsi108_pci_int_unmask(irq);
348 static void tsi108_pci_irq_disable(u_int irq)
350 tsi108_pci_int_mask(irq);
353 static void tsi108_pci_irq_ack(u_int irq)
355 tsi108_pci_int_mask(irq);
358 static void tsi108_pci_irq_end(u_int irq)
360 tsi108_pci_int_unmask(irq);
362 /* Enable interrupts from PCI block */
363 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
364 tsi108_read_reg(TSI108_PCI_OFFSET +
365 TSI108_PCI_IRP_ENABLE) |
366 TSI108_PCI_IRP_ENABLE_P_INT);
371 * Interrupt controller descriptor for cascaded PCI interrupt controller.
374 struct hw_interrupt_type tsi108_pci_irq = {
375 .typename = "tsi108_PCI_int",
376 .enable = tsi108_pci_irq_enable,
377 .disable = tsi108_pci_irq_disable,
378 .ack = tsi108_pci_irq_ack,
379 .end = tsi108_pci_irq_end,
387 * The Tsi108 PCI interrupts initialization routine.
389 * The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block
390 * to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the
391 * PCI block has to be treated as a cascaded interrupt controller connected
395 void __init tsi108_pci_int_init(void)
399 DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
401 for (i = 0; i < NUM_PCI_IRQS; i++) {
402 irq_desc[i + IRQ_PCI_INTAD_BASE].handler = &tsi108_pci_irq;
403 irq_desc[i + IRQ_PCI_INTAD_BASE].status |= IRQ_LEVEL;
409 int tsi108_irq_cascade(struct pt_regs *regs, void *unused)
411 return get_pci_source();