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1/*2 * Support for hardware-managed IRQ auto-distribution.3 *4 * Copyright (C) 2010 Paul Mundt5 *6 * This file is subject to the terms and conditions of the GNU General Public7 * License. See the file "COPYING" in the main directory of this archive8 * for more details.9 */10#include "internals.h"11 12static unsigned long dist_handle[INTC_NR_IRQS];13 14void intc_balancing_enable(unsigned int irq)15{16 struct intc_desc_int *d = get_intc_desc(irq);17 unsigned long handle = dist_handle[irq];18 unsigned long addr;19 20 if (irq_balancing_disabled(irq) || !handle)21 return;22 23 addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);24 intc_reg_fns[_INTC_FN(handle)](addr, handle, 1);25}26 27void intc_balancing_disable(unsigned int irq)28{29 struct intc_desc_int *d = get_intc_desc(irq);30 unsigned long handle = dist_handle[irq];31 unsigned long addr;32 33 if (irq_balancing_disabled(irq) || !handle)34 return;35 36 addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);37 intc_reg_fns[_INTC_FN(handle)](addr, handle, 0);38}39 40static unsigned int intc_dist_data(struct intc_desc *desc,41 struct intc_desc_int *d,42 intc_enum enum_id)43{44 struct intc_mask_reg *mr = desc->hw.mask_regs;45 unsigned int i, j, fn, mode;46 unsigned long reg_e, reg_d;47 48 for (i = 0; mr && enum_id && i < desc->hw.nr_mask_regs; i++) {49 mr = desc->hw.mask_regs + i;50 51 /*52 * Skip this entry if there's no auto-distribution53 * register associated with it.54 */55 if (!mr->dist_reg)56 continue;57 58 for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) {59 if (mr->enum_ids[j] != enum_id)60 continue;61 62 fn = REG_FN_MODIFY_BASE;63 mode = MODE_ENABLE_REG;64 reg_e = mr->dist_reg;65 reg_d = mr->dist_reg;66 67 fn += (mr->reg_width >> 3) - 1;68 return _INTC_MK(fn, mode,69 intc_get_reg(d, reg_e),70 intc_get_reg(d, reg_d),71 1,72 (mr->reg_width - 1) - j);73 }74 }75 76 /*77 * It's possible we've gotten here with no distribution options78 * available for the IRQ in question, so we just skip over those.79 */80 return 0;81}82 83void intc_set_dist_handle(unsigned int irq, struct intc_desc *desc,84 struct intc_desc_int *d, intc_enum id)85{86 unsigned long flags;87 88 /*89 * Nothing to do for this IRQ.90 */91 if (!desc->hw.mask_regs)92 return;93 94 raw_spin_lock_irqsave(&intc_big_lock, flags);95 dist_handle[irq] = intc_dist_data(desc, d, id);96 raw_spin_unlock_irqrestore(&intc_big_lock, flags);97}98