diff options
Diffstat (limited to 'arch/ppc/syslib/gt64260_pic.c')
| -rw-r--r-- | arch/ppc/syslib/gt64260_pic.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/arch/ppc/syslib/gt64260_pic.c b/arch/ppc/syslib/gt64260_pic.c new file mode 100644 index 000000000000..44aa87385451 --- /dev/null +++ b/arch/ppc/syslib/gt64260_pic.c @@ -0,0 +1,328 @@ +/* + * arch/ppc/syslib/gt64260_pic.c + * + * Interrupt controller support for Galileo's GT64260. + * + * Author: Chris Zankel <source@mvista.com> + * Modified by: Mark A. Greer <mgreer@mvista.com> + * + * Based on sources from Rabeeh Khoury / Galileo Technology + * + * 2001 (c) MontaVista, Software, Inc. This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + */ + +/* + * This file contains the specific functions to support the GT64260 + * interrupt controller. + * + * The GT64260 has two main interrupt registers (high and low) that + * summarizes the interrupts generated by the units of the GT64260. + * Each bit is assigned to an interrupt number, where the low register + * are assigned from IRQ0 to IRQ31 and the high cause register + * from IRQ32 to IRQ63 + * The GPP (General Purpose Port) interrupts are assigned from IRQ64 (GPP0) + * to IRQ95 (GPP31). + * get_irq() returns the lowest interrupt number that is currently asserted. + * + * Note: + * - This driver does not initialize the GPP when used as an interrupt + * input. + */ + +#include <linux/stddef.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/sched.h> +#include <linux/signal.h> +#include <linux/stddef.h> +#include <linux/delay.h> +#include <linux/irq.h> + +#include <asm/io.h> +#include <asm/system.h> +#include <asm/irq.h> +#include <asm/mv64x60.h> + +#define CPU_INTR_STR "gt64260 cpu interface error" +#define PCI0_INTR_STR "gt64260 pci 0 error" +#define PCI1_INTR_STR "gt64260 pci 1 error" + +/* ========================== forward declaration ========================== */ + +static void gt64260_unmask_irq(unsigned int); +static void gt64260_mask_irq(unsigned int); + +/* ========================== local declarations =========================== */ + +struct hw_interrupt_type gt64260_pic = { + .typename = " gt64260_pic ", + .enable = gt64260_unmask_irq, + .disable = gt64260_mask_irq, + .ack = gt64260_mask_irq, + .end = gt64260_unmask_irq, +}; + +u32 gt64260_irq_base = 0; /* GT64260 handles the next 96 IRQs from here */ + +static struct mv64x60_handle bh; + +/* gt64260_init_irq() + * + * This function initializes the interrupt controller. It assigns + * all interrupts from IRQ0 to IRQ95 to the gt64260 interrupt controller. + * + * Note: + * We register all GPP inputs as interrupt source, but disable them. + */ +void __init +gt64260_init_irq(void) +{ + int i; + + if (ppc_md.progress) + ppc_md.progress("gt64260_init_irq: enter", 0x0); + + bh.v_base = mv64x60_get_bridge_vbase(); + + ppc_cached_irq_mask[0] = 0; + ppc_cached_irq_mask[1] = 0x0f000000; /* Enable GPP intrs */ + ppc_cached_irq_mask[2] = 0; + + /* disable all interrupts and clear current interrupts */ + mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, ppc_cached_irq_mask[2]); + mv64x60_write(&bh, MV64x60_GPP_INTR_CAUSE, 0); + mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO, ppc_cached_irq_mask[0]); + mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI, ppc_cached_irq_mask[1]); + + /* use the gt64260 for all (possible) interrupt sources */ + for (i = gt64260_irq_base; i < (gt64260_irq_base + 96); i++) + irq_desc[i].handler = >64260_pic; + + if (ppc_md.progress) + ppc_md.progress("gt64260_init_irq: exit", 0x0); +} + +/* + * gt64260_get_irq() + * + * This function returns the lowest interrupt number of all interrupts that + * are currently asserted. + * + * Input Variable(s): + * struct pt_regs* not used + * + * Output Variable(s): + * None. + * + * Returns: + * int <interrupt number> or -2 (bogus interrupt) + */ +int +gt64260_get_irq(struct pt_regs *regs) +{ + int irq; + int irq_gpp; + + irq = mv64x60_read(&bh, GT64260_IC_MAIN_CAUSE_LO); + irq = __ilog2((irq & 0x3dfffffe) & ppc_cached_irq_mask[0]); + + if (irq == -1) { + irq = mv64x60_read(&bh, GT64260_IC_MAIN_CAUSE_HI); + irq = __ilog2((irq & 0x0f000db7) & ppc_cached_irq_mask[1]); + + if (irq == -1) + irq = -2; /* bogus interrupt, should never happen */ + else { + if (irq >= 24) { + irq_gpp = mv64x60_read(&bh, + MV64x60_GPP_INTR_CAUSE); + irq_gpp = __ilog2(irq_gpp & + ppc_cached_irq_mask[2]); + + if (irq_gpp == -1) + irq = -2; + else { + irq = irq_gpp + 64; + mv64x60_write(&bh, + MV64x60_GPP_INTR_CAUSE, + ~(1 << (irq - 64))); + } + } else + irq += 32; + } + } + + (void)mv64x60_read(&bh, MV64x60_GPP_INTR_CAUSE); + + if (irq < 0) + return (irq); + else + return (gt64260_irq_base + irq); +} + +/* gt64260_unmask_irq() + * + * This function enables an interrupt. + * + * Input Variable(s): + * unsigned int interrupt number (IRQ0...IRQ95). + * + * Output Variable(s): + * None. + * + * Returns: + * void + */ +static void +gt64260_unmask_irq(unsigned int irq) +{ + irq -= gt64260_irq_base; + + if (irq > 31) + if (irq > 63) /* unmask GPP irq */ + mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, + ppc_cached_irq_mask[2] |= (1 << (irq - 64))); + else /* mask high interrupt register */ + mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI, + ppc_cached_irq_mask[1] |= (1 << (irq - 32))); + else /* mask low interrupt register */ + mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO, + ppc_cached_irq_mask[0] |= (1 << irq)); + + (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK); + return; +} + +/* gt64260_mask_irq() + * + * This function disables the requested interrupt. + * + * Input Variable(s): + * unsigned int interrupt number (IRQ0...IRQ95). + * + * Output Variable(s): + * None. + * + * Returns: + * void + */ +static void +gt64260_mask_irq(unsigned int irq) +{ + irq -= gt64260_irq_base; + + if (irq > 31) + if (irq > 63) /* mask GPP irq */ + mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, + ppc_cached_irq_mask[2] &= ~(1 << (irq - 64))); + else /* mask high interrupt register */ + mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI, + ppc_cached_irq_mask[1] &= ~(1 << (irq - 32))); + else /* mask low interrupt register */ + mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO, + ppc_cached_irq_mask[0] &= ~(1 << irq)); + + (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK); + return; +} + +static irqreturn_t +gt64260_cpu_error_int_handler(int irq, void *dev_id, struct pt_regs *regs) +{ + printk(KERN_ERR "gt64260_cpu_error_int_handler: %s 0x%08x\n", + "Error on CPU interface - Cause regiser", + mv64x60_read(&bh, MV64x60_CPU_ERR_CAUSE)); + printk(KERN_ERR "\tCPU error register dump:\n"); + printk(KERN_ERR "\tAddress low 0x%08x\n", + mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_LO)); + printk(KERN_ERR "\tAddress high 0x%08x\n", + mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_HI)); + printk(KERN_ERR "\tData low 0x%08x\n", + mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_LO)); + printk(KERN_ERR "\tData high 0x%08x\n", + mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_HI)); + printk(KERN_ERR "\tParity 0x%08x\n", + mv64x60_read(&bh, MV64x60_CPU_ERR_PARITY)); + mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0); + return IRQ_HANDLED; +} + +static irqreturn_t +gt64260_pci_error_int_handler(int irq, void *dev_id, struct pt_regs *regs) +{ + u32 val; + unsigned int pci_bus = (unsigned int)dev_id; + + if (pci_bus == 0) { /* Error on PCI 0 */ + val = mv64x60_read(&bh, MV64x60_PCI0_ERR_CAUSE); + printk(KERN_ERR "%s: Error in PCI %d Interface\n", + "gt64260_pci_error_int_handler", pci_bus); + printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus); + printk(KERN_ERR "\tCause register 0x%08x\n", val); + printk(KERN_ERR "\tAddress Low 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_LO)); + printk(KERN_ERR "\tAddress High 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_HI)); + printk(KERN_ERR "\tAttribute 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI0_ERR_DATA_LO)); + printk(KERN_ERR "\tCommand 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI0_ERR_CMD)); + mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, ~val); + } + if (pci_bus == 1) { /* Error on PCI 1 */ + val = mv64x60_read(&bh, MV64x60_PCI1_ERR_CAUSE); + printk(KERN_ERR "%s: Error in PCI %d Interface\n", + "gt64260_pci_error_int_handler", pci_bus); + printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus); + printk(KERN_ERR "\tCause register 0x%08x\n", val); + printk(KERN_ERR "\tAddress Low 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_LO)); + printk(KERN_ERR "\tAddress High 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_HI)); + printk(KERN_ERR "\tAttribute 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI1_ERR_DATA_LO)); + printk(KERN_ERR "\tCommand 0x%08x\n", + mv64x60_read(&bh, MV64x60_PCI1_ERR_CMD)); + mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, ~val); + } + return IRQ_HANDLED; +} + +static int __init +gt64260_register_hdlrs(void) +{ + int rc; + + /* Register CPU interface error interrupt handler */ + if ((rc = request_irq(MV64x60_IRQ_CPU_ERR, + gt64260_cpu_error_int_handler, SA_INTERRUPT, CPU_INTR_STR, 0))) + printk(KERN_WARNING "Can't register cpu error handler: %d", rc); + + mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0); + mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0x000000fe); + + /* Register PCI 0 error interrupt handler */ + if ((rc = request_irq(MV64360_IRQ_PCI0, gt64260_pci_error_int_handler, + SA_INTERRUPT, PCI0_INTR_STR, (void *)0))) + printk(KERN_WARNING "Can't register pci 0 error handler: %d", + rc); + + mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0); + mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0x003c0c24); + + /* Register PCI 1 error interrupt handler */ + if ((rc = request_irq(MV64360_IRQ_PCI1, gt64260_pci_error_int_handler, + SA_INTERRUPT, PCI1_INTR_STR, (void *)1))) + printk(KERN_WARNING "Can't register pci 1 error handler: %d", + rc); + + mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0); + mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0x003c0c24); + + return 0; +} + +arch_initcall(gt64260_register_hdlrs); |