1/*
  2 *  Atheros AR71xx/AR724x/AR913x specific interrupt handling
  3 *
  4 *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
  5 *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
  6 *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  7 *
  8 *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
  9 *
 10 *  This program is free software; you can redistribute it and/or modify it
 11 *  under the terms of the GNU General Public License version 2 as published
 12 *  by the Free Software Foundation.
 13 */
 14
 15#include <linux/kernel.h>
 16#include <linux/init.h>
 17#include <linux/interrupt.h>
 18#include <linux/irqchip.h>
 19#include <linux/of_irq.h>
 20
 21#include <asm/irq_cpu.h>
 22#include <asm/mipsregs.h>
 23
 24#include <asm/mach-ath79/ath79.h>
 25#include <asm/mach-ath79/ar71xx_regs.h>
 26#include "common.h"
 27#include "machtypes.h"
 28
 29
 30static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
 31{
 32	u32 status;
 33
 34	status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);
 35
 36	if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
 37		ath79_ddr_wb_flush(3);
 38		generic_handle_irq(ATH79_IP2_IRQ(0));
 39	} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
 40		ath79_ddr_wb_flush(4);
 41		generic_handle_irq(ATH79_IP2_IRQ(1));
 42	} else {
 43		spurious_interrupt();
 44	}
 45}
 46
 47static void ar934x_ip2_irq_init(void)
 48{
 49	int i;
 50
 51	for (i = ATH79_IP2_IRQ_BASE;
 52	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
 53		irq_set_chip_and_handler(i, &dummy_irq_chip,
 54					 handle_level_irq);
 55
 56	irq_set_chained_handler(ATH79_CPU_IRQ(2), ar934x_ip2_irq_dispatch);
 57}
 58
 59static void qca955x_ip2_irq_dispatch(struct irq_desc *desc)
 60{
 61	u32 status;
 62
 63	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
 64	status &= QCA955X_EXT_INT_PCIE_RC1_ALL | QCA955X_EXT_INT_WMAC_ALL;
 65
 66	if (status == 0) {
 67		spurious_interrupt();
 68		return;
 69	}
 70
 71	if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) {
 72		/* TODO: flush DDR? */
 73		generic_handle_irq(ATH79_IP2_IRQ(0));
 74	}
 75
 76	if (status & QCA955X_EXT_INT_WMAC_ALL) {
 77		/* TODO: flush DDR? */
 78		generic_handle_irq(ATH79_IP2_IRQ(1));
 79	}
 80}
 81
 82static void qca955x_ip3_irq_dispatch(struct irq_desc *desc)
 83{
 84	u32 status;
 85
 86	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
 87	status &= QCA955X_EXT_INT_PCIE_RC2_ALL |
 88		  QCA955X_EXT_INT_USB1 |
 89		  QCA955X_EXT_INT_USB2;
 90
 91	if (status == 0) {
 92		spurious_interrupt();
 93		return;
 94	}
 95
 96	if (status & QCA955X_EXT_INT_USB1) {
 97		/* TODO: flush DDR? */
 98		generic_handle_irq(ATH79_IP3_IRQ(0));
 99	}
100
101	if (status & QCA955X_EXT_INT_USB2) {
102		/* TODO: flush DDR? */
103		generic_handle_irq(ATH79_IP3_IRQ(1));
104	}
105
106	if (status & QCA955X_EXT_INT_PCIE_RC2_ALL) {
107		/* TODO: flush DDR? */
108		generic_handle_irq(ATH79_IP3_IRQ(2));
109	}
110}
111
112static void qca955x_irq_init(void)
113{
114	int i;
115
116	for (i = ATH79_IP2_IRQ_BASE;
117	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
118		irq_set_chip_and_handler(i, &dummy_irq_chip,
119					 handle_level_irq);
120
121	irq_set_chained_handler(ATH79_CPU_IRQ(2), qca955x_ip2_irq_dispatch);
122
123	for (i = ATH79_IP3_IRQ_BASE;
124	     i < ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT; i++)
125		irq_set_chip_and_handler(i, &dummy_irq_chip,
126					 handle_level_irq);
127
128	irq_set_chained_handler(ATH79_CPU_IRQ(3), qca955x_ip3_irq_dispatch);
129}
130
131void __init arch_init_irq(void)
132{
133	unsigned irq_wb_chan2 = -1;
134	unsigned irq_wb_chan3 = -1;
135	bool misc_is_ar71xx;
136
137	if (mips_machtype == ATH79_MACH_GENERIC_OF) {
138		irqchip_init();
139		return;
140	}
141
142	if (soc_is_ar71xx() || soc_is_ar724x() ||
143	    soc_is_ar913x() || soc_is_ar933x()) {
144		irq_wb_chan2 = 3;
145		irq_wb_chan3 = 2;
146	} else if (soc_is_ar934x()) {
147		irq_wb_chan3 = 2;
148	}
149
150	ath79_cpu_irq_init(irq_wb_chan2, irq_wb_chan3);
151
152	if (soc_is_ar71xx() || soc_is_ar913x())
153		misc_is_ar71xx = true;
154	else if (soc_is_ar724x() ||
155		 soc_is_ar933x() ||
156		 soc_is_ar934x() ||
157		 soc_is_qca955x())
158		misc_is_ar71xx = false;
159	else
160		BUG();
161	ath79_misc_irq_init(
162		ath79_reset_base + AR71XX_RESET_REG_MISC_INT_STATUS,
163		ATH79_CPU_IRQ(6), ATH79_MISC_IRQ_BASE, misc_is_ar71xx);
164
165	if (soc_is_ar934x())
166		ar934x_ip2_irq_init();
167	else if (soc_is_qca955x())
168		qca955x_irq_init();
169}