12be6bb0cSPaul Mundt /* 22be6bb0cSPaul Mundt * Support for hardware-managed IRQ auto-distribution. 32be6bb0cSPaul Mundt * 42be6bb0cSPaul Mundt * Copyright (C) 2010 Paul Mundt 52be6bb0cSPaul Mundt * 62be6bb0cSPaul Mundt * This file is subject to the terms and conditions of the GNU General Public 72be6bb0cSPaul Mundt * License. See the file "COPYING" in the main directory of this archive 82be6bb0cSPaul Mundt * for more details. 92be6bb0cSPaul Mundt */ 102be6bb0cSPaul Mundt #include "internals.h" 112be6bb0cSPaul Mundt 122be6bb0cSPaul Mundt static unsigned long dist_handle[NR_IRQS]; 132be6bb0cSPaul Mundt 142be6bb0cSPaul Mundt void intc_balancing_enable(unsigned int irq) 152be6bb0cSPaul Mundt { 162be6bb0cSPaul Mundt struct intc_desc_int *d = get_intc_desc(irq); 172be6bb0cSPaul Mundt unsigned long handle = dist_handle[irq]; 182be6bb0cSPaul Mundt unsigned long addr; 192be6bb0cSPaul Mundt 202be6bb0cSPaul Mundt if (irq_balancing_disabled(irq) || !handle) 212be6bb0cSPaul Mundt return; 222be6bb0cSPaul Mundt 232be6bb0cSPaul Mundt addr = INTC_REG(d, _INTC_ADDR_D(handle), 0); 242be6bb0cSPaul Mundt intc_reg_fns[_INTC_FN(handle)](addr, handle, 1); 252be6bb0cSPaul Mundt } 262be6bb0cSPaul Mundt 272be6bb0cSPaul Mundt void intc_balancing_disable(unsigned int irq) 282be6bb0cSPaul Mundt { 292be6bb0cSPaul Mundt struct intc_desc_int *d = get_intc_desc(irq); 302be6bb0cSPaul Mundt unsigned long handle = dist_handle[irq]; 312be6bb0cSPaul Mundt unsigned long addr; 322be6bb0cSPaul Mundt 332be6bb0cSPaul Mundt if (irq_balancing_disabled(irq) || !handle) 342be6bb0cSPaul Mundt return; 352be6bb0cSPaul Mundt 362be6bb0cSPaul Mundt addr = INTC_REG(d, _INTC_ADDR_D(handle), 0); 372be6bb0cSPaul Mundt intc_reg_fns[_INTC_FN(handle)](addr, handle, 0); 382be6bb0cSPaul Mundt } 392be6bb0cSPaul Mundt 402be6bb0cSPaul Mundt static unsigned int intc_dist_data(struct intc_desc *desc, 412be6bb0cSPaul Mundt struct intc_desc_int *d, 422be6bb0cSPaul Mundt intc_enum enum_id) 432be6bb0cSPaul Mundt { 442be6bb0cSPaul Mundt struct intc_mask_reg *mr = desc->hw.mask_regs; 452be6bb0cSPaul Mundt unsigned int i, j, fn, mode; 462be6bb0cSPaul Mundt unsigned long reg_e, reg_d; 472be6bb0cSPaul Mundt 482be6bb0cSPaul Mundt for (i = 0; mr && enum_id && i < desc->hw.nr_mask_regs; i++) { 492be6bb0cSPaul Mundt mr = desc->hw.mask_regs + i; 502be6bb0cSPaul Mundt 512be6bb0cSPaul Mundt /* 522be6bb0cSPaul Mundt * Skip this entry if there's no auto-distribution 532be6bb0cSPaul Mundt * register associated with it. 542be6bb0cSPaul Mundt */ 552be6bb0cSPaul Mundt if (!mr->dist_reg) 562be6bb0cSPaul Mundt continue; 572be6bb0cSPaul Mundt 582be6bb0cSPaul Mundt for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) { 592be6bb0cSPaul Mundt if (mr->enum_ids[j] != enum_id) 602be6bb0cSPaul Mundt continue; 612be6bb0cSPaul Mundt 622be6bb0cSPaul Mundt fn = REG_FN_MODIFY_BASE; 632be6bb0cSPaul Mundt mode = MODE_ENABLE_REG; 642be6bb0cSPaul Mundt reg_e = mr->dist_reg; 652be6bb0cSPaul Mundt reg_d = mr->dist_reg; 662be6bb0cSPaul Mundt 672be6bb0cSPaul Mundt fn += (mr->reg_width >> 3) - 1; 682be6bb0cSPaul Mundt return _INTC_MK(fn, mode, 692be6bb0cSPaul Mundt intc_get_reg(d, reg_e), 702be6bb0cSPaul Mundt intc_get_reg(d, reg_d), 712be6bb0cSPaul Mundt 1, 722be6bb0cSPaul Mundt (mr->reg_width - 1) - j); 732be6bb0cSPaul Mundt } 742be6bb0cSPaul Mundt } 752be6bb0cSPaul Mundt 762be6bb0cSPaul Mundt /* 772be6bb0cSPaul Mundt * It's possible we've gotten here with no distribution options 782be6bb0cSPaul Mundt * available for the IRQ in question, so we just skip over those. 792be6bb0cSPaul Mundt */ 802be6bb0cSPaul Mundt return 0; 812be6bb0cSPaul Mundt } 822be6bb0cSPaul Mundt 832be6bb0cSPaul Mundt void intc_set_dist_handle(unsigned int irq, struct intc_desc *desc, 842be6bb0cSPaul Mundt struct intc_desc_int *d, intc_enum id) 852be6bb0cSPaul Mundt { 862be6bb0cSPaul Mundt unsigned long flags; 872be6bb0cSPaul Mundt 882be6bb0cSPaul Mundt /* 892be6bb0cSPaul Mundt * Nothing to do for this IRQ. 902be6bb0cSPaul Mundt */ 912be6bb0cSPaul Mundt if (!desc->hw.mask_regs) 922be6bb0cSPaul Mundt return; 932be6bb0cSPaul Mundt 942be6bb0cSPaul Mundt raw_spin_lock_irqsave(&intc_big_lock, flags); 952be6bb0cSPaul Mundt dist_handle[irq] = intc_dist_data(desc, d, id); 962be6bb0cSPaul Mundt raw_spin_unlock_irqrestore(&intc_big_lock, flags); 972be6bb0cSPaul Mundt } 98