1 /* 2 * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved. 3 * Copyright (C) 2014 Oleksij Rempel <linux@rempel-privat.de> 4 * Add Alphascale ASM9260 support. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/init.h> 23 #include <linux/irq.h> 24 #include <linux/irqchip.h> 25 #include <linux/irqdomain.h> 26 #include <linux/io.h> 27 #include <linux/of.h> 28 #include <linux/of_address.h> 29 #include <linux/of_irq.h> 30 #include <linux/stmp_device.h> 31 #include <asm/exception.h> 32 33 #include "alphascale_asm9260-icoll.h" 34 35 /* 36 * this device provide 4 offsets for each register: 37 * 0x0 - plain read write mode 38 * 0x4 - set mode, OR logic. 39 * 0x8 - clr mode, XOR logic. 40 * 0xc - togle mode. 41 */ 42 #define SET_REG 4 43 #define CLR_REG 8 44 45 #define HW_ICOLL_VECTOR 0x0000 46 #define HW_ICOLL_LEVELACK 0x0010 47 #define HW_ICOLL_CTRL 0x0020 48 #define HW_ICOLL_STAT_OFFSET 0x0070 49 #define HW_ICOLL_INTERRUPT0 0x0120 50 #define HW_ICOLL_INTERRUPTn(n) ((n) * 0x10) 51 #define BM_ICOLL_INTR_ENABLE BIT(2) 52 #define BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 0x1 53 54 #define ICOLL_NUM_IRQS 128 55 56 enum icoll_type { 57 ICOLL, 58 ASM9260_ICOLL, 59 }; 60 61 struct icoll_priv { 62 void __iomem *vector; 63 void __iomem *levelack; 64 void __iomem *ctrl; 65 void __iomem *stat; 66 void __iomem *intr; 67 void __iomem *clear; 68 enum icoll_type type; 69 }; 70 71 static struct icoll_priv icoll_priv; 72 static struct irq_domain *icoll_domain; 73 74 /* calculate bit offset depending on number of intterupt per register */ 75 static u32 icoll_intr_bitshift(struct irq_data *d, u32 bit) 76 { 77 /* 78 * mask lower part of hwirq to convert it 79 * in 0, 1, 2 or 3 and then multiply it by 8 (or shift by 3) 80 */ 81 return bit << ((d->hwirq & 3) << 3); 82 } 83 84 /* calculate mem offset depending on number of intterupt per register */ 85 static void __iomem *icoll_intr_reg(struct irq_data *d) 86 { 87 /* offset = hwirq / intr_per_reg * 0x10 */ 88 return icoll_priv.intr + ((d->hwirq >> 2) * 0x10); 89 } 90 91 static void icoll_ack_irq(struct irq_data *d) 92 { 93 /* 94 * The Interrupt Collector is able to prioritize irqs. 95 * Currently only level 0 is used. So acking can use 96 * BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 unconditionally. 97 */ 98 __raw_writel(BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0, 99 icoll_priv.levelack); 100 } 101 102 static void icoll_mask_irq(struct irq_data *d) 103 { 104 __raw_writel(BM_ICOLL_INTR_ENABLE, 105 icoll_priv.intr + CLR_REG + HW_ICOLL_INTERRUPTn(d->hwirq)); 106 } 107 108 static void icoll_unmask_irq(struct irq_data *d) 109 { 110 __raw_writel(BM_ICOLL_INTR_ENABLE, 111 icoll_priv.intr + SET_REG + HW_ICOLL_INTERRUPTn(d->hwirq)); 112 } 113 114 static void asm9260_mask_irq(struct irq_data *d) 115 { 116 __raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE), 117 icoll_intr_reg(d) + CLR_REG); 118 } 119 120 static void asm9260_unmask_irq(struct irq_data *d) 121 { 122 __raw_writel(ASM9260_BM_CLEAR_BIT(d->hwirq), 123 icoll_priv.clear + 124 ASM9260_HW_ICOLL_CLEARn(d->hwirq)); 125 126 __raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE), 127 icoll_intr_reg(d) + SET_REG); 128 } 129 130 static struct irq_chip mxs_icoll_chip = { 131 .irq_ack = icoll_ack_irq, 132 .irq_mask = icoll_mask_irq, 133 .irq_unmask = icoll_unmask_irq, 134 .flags = IRQCHIP_MASK_ON_SUSPEND | 135 IRQCHIP_SKIP_SET_WAKE, 136 }; 137 138 static struct irq_chip asm9260_icoll_chip = { 139 .irq_ack = icoll_ack_irq, 140 .irq_mask = asm9260_mask_irq, 141 .irq_unmask = asm9260_unmask_irq, 142 .flags = IRQCHIP_MASK_ON_SUSPEND | 143 IRQCHIP_SKIP_SET_WAKE, 144 }; 145 146 asmlinkage void __exception_irq_entry icoll_handle_irq(struct pt_regs *regs) 147 { 148 u32 irqnr; 149 150 irqnr = __raw_readl(icoll_priv.stat); 151 __raw_writel(irqnr, icoll_priv.vector); 152 handle_domain_irq(icoll_domain, irqnr, regs); 153 } 154 155 static int icoll_irq_domain_map(struct irq_domain *d, unsigned int virq, 156 irq_hw_number_t hw) 157 { 158 struct irq_chip *chip; 159 160 if (icoll_priv.type == ICOLL) 161 chip = &mxs_icoll_chip; 162 else 163 chip = &asm9260_icoll_chip; 164 165 irq_set_chip_and_handler(virq, chip, handle_level_irq); 166 167 return 0; 168 } 169 170 static const struct irq_domain_ops icoll_irq_domain_ops = { 171 .map = icoll_irq_domain_map, 172 .xlate = irq_domain_xlate_onecell, 173 }; 174 175 static void __init icoll_add_domain(struct device_node *np, 176 int num) 177 { 178 icoll_domain = irq_domain_add_linear(np, num, 179 &icoll_irq_domain_ops, NULL); 180 181 if (!icoll_domain) 182 panic("%s: unable to create irq domain", np->full_name); 183 } 184 185 static void __iomem * __init icoll_init_iobase(struct device_node *np) 186 { 187 void __iomem *icoll_base; 188 189 icoll_base = of_io_request_and_map(np, 0, np->name); 190 if (IS_ERR(icoll_base)) 191 panic("%s: unable to map resource", np->full_name); 192 return icoll_base; 193 } 194 195 static int __init icoll_of_init(struct device_node *np, 196 struct device_node *interrupt_parent) 197 { 198 void __iomem *icoll_base; 199 200 icoll_priv.type = ICOLL; 201 202 icoll_base = icoll_init_iobase(np); 203 icoll_priv.vector = icoll_base + HW_ICOLL_VECTOR; 204 icoll_priv.levelack = icoll_base + HW_ICOLL_LEVELACK; 205 icoll_priv.ctrl = icoll_base + HW_ICOLL_CTRL; 206 icoll_priv.stat = icoll_base + HW_ICOLL_STAT_OFFSET; 207 icoll_priv.intr = icoll_base + HW_ICOLL_INTERRUPT0; 208 icoll_priv.clear = NULL; 209 210 /* 211 * Interrupt Collector reset, which initializes the priority 212 * for each irq to level 0. 213 */ 214 stmp_reset_block(icoll_priv.ctrl); 215 216 icoll_add_domain(np, ICOLL_NUM_IRQS); 217 218 return 0; 219 } 220 IRQCHIP_DECLARE(mxs, "fsl,icoll", icoll_of_init); 221 222 static int __init asm9260_of_init(struct device_node *np, 223 struct device_node *interrupt_parent) 224 { 225 void __iomem *icoll_base; 226 int i; 227 228 icoll_priv.type = ASM9260_ICOLL; 229 230 icoll_base = icoll_init_iobase(np); 231 icoll_priv.vector = icoll_base + ASM9260_HW_ICOLL_VECTOR; 232 icoll_priv.levelack = icoll_base + ASM9260_HW_ICOLL_LEVELACK; 233 icoll_priv.ctrl = icoll_base + ASM9260_HW_ICOLL_CTRL; 234 icoll_priv.stat = icoll_base + ASM9260_HW_ICOLL_STAT_OFFSET; 235 icoll_priv.intr = icoll_base + ASM9260_HW_ICOLL_INTERRUPT0; 236 icoll_priv.clear = icoll_base + ASM9260_HW_ICOLL_CLEAR0; 237 238 writel_relaxed(ASM9260_BM_CTRL_IRQ_ENABLE, 239 icoll_priv.ctrl); 240 /* 241 * ASM9260 don't provide reset bit. So, we need to set level 0 242 * manually. 243 */ 244 for (i = 0; i < 16 * 0x10; i += 0x10) 245 writel(0, icoll_priv.intr + i); 246 247 icoll_add_domain(np, ASM9260_NUM_IRQS); 248 set_handle_irq(icoll_handle_irq); 249 250 return 0; 251 } 252 IRQCHIP_DECLARE(asm9260, "alphascale,asm9260-icoll", asm9260_of_init); 253