2 * Interrupt controller support for Galileo's GT64260.
4 * Author: Chris Zankel <source@mvista.com>
5 * Modified by: Mark A. Greer <mgreer@mvista.com>
7 * Based on sources from Rabeeh Khoury / Galileo Technology
9 * 2001 (c) MontaVista, Software, Inc. This file is licensed under
10 * the terms of the GNU General Public License version 2. This program
11 * is licensed "as is" without any warranty of any kind, whether express
16 * This file contains the specific functions to support the GT64260
17 * interrupt controller.
19 * The GT64260 has two main interrupt registers (high and low) that
20 * summarizes the interrupts generated by the units of the GT64260.
21 * Each bit is assigned to an interrupt number, where the low register
22 * are assigned from IRQ0 to IRQ31 and the high cause register
24 * The GPP (General Purpose Port) interrupts are assigned from IRQ64 (GPP0)
26 * get_irq() returns the lowest interrupt number that is currently asserted.
29 * - This driver does not initialize the GPP when used as an interrupt
33 #include <linux/stddef.h>
34 #include <linux/init.h>
35 #include <linux/interrupt.h>
36 #include <linux/sched.h>
37 #include <linux/signal.h>
38 #include <linux/delay.h>
39 #include <linux/irq.h>
42 #include <asm/system.h>
44 #include <asm/mv64x60.h>
45 #include <asm/machdep.h>
47 #define CPU_INTR_STR "gt64260 cpu interface error"
48 #define PCI0_INTR_STR "gt64260 pci 0 error"
49 #define PCI1_INTR_STR "gt64260 pci 1 error"
51 /* ========================== forward declaration ========================== */
53 static void gt64260_unmask_irq(unsigned int);
54 static void gt64260_mask_irq(unsigned int);
56 /* ========================== local declarations =========================== */
58 struct hw_interrupt_type gt64260_pic = {
59 .typename = " gt64260_pic ",
60 .enable = gt64260_unmask_irq,
61 .disable = gt64260_mask_irq,
62 .ack = gt64260_mask_irq,
63 .end = gt64260_unmask_irq,
66 u32 gt64260_irq_base = 0; /* GT64260 handles the next 96 IRQs from here */
68 static struct mv64x60_handle bh;
72 * This function initializes the interrupt controller. It assigns
73 * all interrupts from IRQ0 to IRQ95 to the gt64260 interrupt controller.
76 * We register all GPP inputs as interrupt source, but disable them.
79 gt64260_init_irq(void)
84 ppc_md.progress("gt64260_init_irq: enter", 0x0);
86 bh.v_base = mv64x60_get_bridge_vbase();
88 ppc_cached_irq_mask[0] = 0;
89 ppc_cached_irq_mask[1] = 0x0f000000; /* Enable GPP intrs */
90 ppc_cached_irq_mask[2] = 0;
92 /* disable all interrupts and clear current interrupts */
93 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, ppc_cached_irq_mask[2]);
94 mv64x60_write(&bh, MV64x60_GPP_INTR_CAUSE, 0);
95 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO, ppc_cached_irq_mask[0]);
96 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI, ppc_cached_irq_mask[1]);
98 /* use the gt64260 for all (possible) interrupt sources */
99 for (i = gt64260_irq_base; i < (gt64260_irq_base + 96); i++)
100 irq_desc[i].chip = >64260_pic;
103 ppc_md.progress("gt64260_init_irq: exit", 0x0);
109 * This function returns the lowest interrupt number of all interrupts that
110 * are currently asserted.
112 * Output Variable(s):
116 * int <interrupt number> or -2 (bogus interrupt)
119 gt64260_get_irq(void)
124 irq = mv64x60_read(&bh, GT64260_IC_MAIN_CAUSE_LO);
125 irq = __ilog2((irq & 0x3dfffffe) & ppc_cached_irq_mask[0]);
128 irq = mv64x60_read(&bh, GT64260_IC_MAIN_CAUSE_HI);
129 irq = __ilog2((irq & 0x0f000db7) & ppc_cached_irq_mask[1]);
132 irq = -2; /* bogus interrupt, should never happen */
135 irq_gpp = mv64x60_read(&bh,
136 MV64x60_GPP_INTR_CAUSE);
137 irq_gpp = __ilog2(irq_gpp &
138 ppc_cached_irq_mask[2]);
145 MV64x60_GPP_INTR_CAUSE,
153 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_CAUSE);
158 return (gt64260_irq_base + irq);
161 /* gt64260_unmask_irq()
163 * This function enables an interrupt.
166 * unsigned int interrupt number (IRQ0...IRQ95).
168 * Output Variable(s):
175 gt64260_unmask_irq(unsigned int irq)
177 irq -= gt64260_irq_base;
180 if (irq > 63) /* unmask GPP irq */
181 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
182 ppc_cached_irq_mask[2] |= (1 << (irq - 64)));
183 else /* mask high interrupt register */
184 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI,
185 ppc_cached_irq_mask[1] |= (1 << (irq - 32)));
186 else /* mask low interrupt register */
187 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO,
188 ppc_cached_irq_mask[0] |= (1 << irq));
190 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
194 /* gt64260_mask_irq()
196 * This function disables the requested interrupt.
199 * unsigned int interrupt number (IRQ0...IRQ95).
201 * Output Variable(s):
208 gt64260_mask_irq(unsigned int irq)
210 irq -= gt64260_irq_base;
213 if (irq > 63) /* mask GPP irq */
214 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
215 ppc_cached_irq_mask[2] &= ~(1 << (irq - 64)));
216 else /* mask high interrupt register */
217 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI,
218 ppc_cached_irq_mask[1] &= ~(1 << (irq - 32)));
219 else /* mask low interrupt register */
220 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO,
221 ppc_cached_irq_mask[0] &= ~(1 << irq));
223 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
228 gt64260_cpu_error_int_handler(int irq, void *dev_id)
230 printk(KERN_ERR "gt64260_cpu_error_int_handler: %s 0x%08x\n",
231 "Error on CPU interface - Cause regiser",
232 mv64x60_read(&bh, MV64x60_CPU_ERR_CAUSE));
233 printk(KERN_ERR "\tCPU error register dump:\n");
234 printk(KERN_ERR "\tAddress low 0x%08x\n",
235 mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_LO));
236 printk(KERN_ERR "\tAddress high 0x%08x\n",
237 mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_HI));
238 printk(KERN_ERR "\tData low 0x%08x\n",
239 mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_LO));
240 printk(KERN_ERR "\tData high 0x%08x\n",
241 mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_HI));
242 printk(KERN_ERR "\tParity 0x%08x\n",
243 mv64x60_read(&bh, MV64x60_CPU_ERR_PARITY));
244 mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
249 gt64260_pci_error_int_handler(int irq, void *dev_id)
252 unsigned int pci_bus = (unsigned int)dev_id;
254 if (pci_bus == 0) { /* Error on PCI 0 */
255 val = mv64x60_read(&bh, MV64x60_PCI0_ERR_CAUSE);
256 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
257 "gt64260_pci_error_int_handler", pci_bus);
258 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
259 printk(KERN_ERR "\tCause register 0x%08x\n", val);
260 printk(KERN_ERR "\tAddress Low 0x%08x\n",
261 mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_LO));
262 printk(KERN_ERR "\tAddress High 0x%08x\n",
263 mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_HI));
264 printk(KERN_ERR "\tAttribute 0x%08x\n",
265 mv64x60_read(&bh, MV64x60_PCI0_ERR_DATA_LO));
266 printk(KERN_ERR "\tCommand 0x%08x\n",
267 mv64x60_read(&bh, MV64x60_PCI0_ERR_CMD));
268 mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, ~val);
270 if (pci_bus == 1) { /* Error on PCI 1 */
271 val = mv64x60_read(&bh, MV64x60_PCI1_ERR_CAUSE);
272 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
273 "gt64260_pci_error_int_handler", pci_bus);
274 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
275 printk(KERN_ERR "\tCause register 0x%08x\n", val);
276 printk(KERN_ERR "\tAddress Low 0x%08x\n",
277 mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_LO));
278 printk(KERN_ERR "\tAddress High 0x%08x\n",
279 mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_HI));
280 printk(KERN_ERR "\tAttribute 0x%08x\n",
281 mv64x60_read(&bh, MV64x60_PCI1_ERR_DATA_LO));
282 printk(KERN_ERR "\tCommand 0x%08x\n",
283 mv64x60_read(&bh, MV64x60_PCI1_ERR_CMD));
284 mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, ~val);
290 gt64260_register_hdlrs(void)
294 /* Register CPU interface error interrupt handler */
295 if ((rc = request_irq(MV64x60_IRQ_CPU_ERR,
296 gt64260_cpu_error_int_handler, IRQF_DISABLED, CPU_INTR_STR, 0)))
297 printk(KERN_WARNING "Can't register cpu error handler: %d", rc);
299 mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0);
300 mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0x000000fe);
302 /* Register PCI 0 error interrupt handler */
303 if ((rc = request_irq(MV64360_IRQ_PCI0, gt64260_pci_error_int_handler,
304 IRQF_DISABLED, PCI0_INTR_STR, (void *)0)))
305 printk(KERN_WARNING "Can't register pci 0 error handler: %d",
308 mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0);
309 mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0x003c0c24);
311 /* Register PCI 1 error interrupt handler */
312 if ((rc = request_irq(MV64360_IRQ_PCI1, gt64260_pci_error_int_handler,
313 IRQF_DISABLED, PCI1_INTR_STR, (void *)1)))
314 printk(KERN_WARNING "Can't register pci 1 error handler: %d",
317 mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0);
318 mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0x003c0c24);
323 arch_initcall(gt64260_register_hdlrs);