1 /* 2 * Support for hardware-managed IRQ auto-distribution. 3 * 4 * Copyright (C) 2010 Paul Mundt 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 #include "internals.h" 11 12 static unsigned long dist_handle[INTC_NR_IRQS]; 13 14 void 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 27 void 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 40 static 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-distribution 53 * 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 options 78 * available for the IRQ in question, so we just skip over those. 79 */ 80 return 0; 81 } 82 83 void 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