1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2017 NXP 4 * Copyright (C) 2018 Pengutronix, Lucas Stach <kernel@pengutronix.de> 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/interrupt.h> 9 #include <linux/irq.h> 10 #include <linux/irqchip/chained_irq.h> 11 #include <linux/irqdomain.h> 12 #include <linux/kernel.h> 13 #include <linux/of_irq.h> 14 #include <linux/of_platform.h> 15 #include <linux/spinlock.h> 16 17 #define CTRL_STRIDE_OFF(_t, _r) (_t * 4 * _r) 18 #define CHANCTRL 0x0 19 #define CHANMASK(n, t) (CTRL_STRIDE_OFF(t, 0) + 0x4 * (n) + 0x4) 20 #define CHANSET(n, t) (CTRL_STRIDE_OFF(t, 1) + 0x4 * (n) + 0x4) 21 #define CHANSTATUS(n, t) (CTRL_STRIDE_OFF(t, 2) + 0x4 * (n) + 0x4) 22 #define CHAN_MINTDIS(t) (CTRL_STRIDE_OFF(t, 3) + 0x4) 23 #define CHAN_MASTRSTAT(t) (CTRL_STRIDE_OFF(t, 3) + 0x8) 24 25 #define CHAN_MAX_OUTPUT_INT 0x8 26 27 struct irqsteer_data { 28 void __iomem *regs; 29 struct clk *ipg_clk; 30 int irq[CHAN_MAX_OUTPUT_INT]; 31 int irq_count; 32 raw_spinlock_t lock; 33 int reg_num; 34 int channel; 35 struct irq_domain *domain; 36 u32 *saved_reg; 37 }; 38 39 static int imx_irqsteer_get_reg_index(struct irqsteer_data *data, 40 unsigned long irqnum) 41 { 42 return (data->reg_num - irqnum / 32 - 1); 43 } 44 45 static void imx_irqsteer_irq_unmask(struct irq_data *d) 46 { 47 struct irqsteer_data *data = d->chip_data; 48 int idx = imx_irqsteer_get_reg_index(data, d->hwirq); 49 unsigned long flags; 50 u32 val; 51 52 raw_spin_lock_irqsave(&data->lock, flags); 53 val = readl_relaxed(data->regs + CHANMASK(idx, data->reg_num)); 54 val |= BIT(d->hwirq % 32); 55 writel_relaxed(val, data->regs + CHANMASK(idx, data->reg_num)); 56 raw_spin_unlock_irqrestore(&data->lock, flags); 57 } 58 59 static void imx_irqsteer_irq_mask(struct irq_data *d) 60 { 61 struct irqsteer_data *data = d->chip_data; 62 int idx = imx_irqsteer_get_reg_index(data, d->hwirq); 63 unsigned long flags; 64 u32 val; 65 66 raw_spin_lock_irqsave(&data->lock, flags); 67 val = readl_relaxed(data->regs + CHANMASK(idx, data->reg_num)); 68 val &= ~BIT(d->hwirq % 32); 69 writel_relaxed(val, data->regs + CHANMASK(idx, data->reg_num)); 70 raw_spin_unlock_irqrestore(&data->lock, flags); 71 } 72 73 static struct irq_chip imx_irqsteer_irq_chip = { 74 .name = "irqsteer", 75 .irq_mask = imx_irqsteer_irq_mask, 76 .irq_unmask = imx_irqsteer_irq_unmask, 77 }; 78 79 static int imx_irqsteer_irq_map(struct irq_domain *h, unsigned int irq, 80 irq_hw_number_t hwirq) 81 { 82 irq_set_status_flags(irq, IRQ_LEVEL); 83 irq_set_chip_data(irq, h->host_data); 84 irq_set_chip_and_handler(irq, &imx_irqsteer_irq_chip, handle_level_irq); 85 86 return 0; 87 } 88 89 static const struct irq_domain_ops imx_irqsteer_domain_ops = { 90 .map = imx_irqsteer_irq_map, 91 .xlate = irq_domain_xlate_onecell, 92 }; 93 94 static int imx_irqsteer_get_hwirq_base(struct irqsteer_data *data, u32 irq) 95 { 96 int i; 97 98 for (i = 0; i < data->irq_count; i++) { 99 if (data->irq[i] == irq) 100 return i * 64; 101 } 102 103 return -EINVAL; 104 } 105 106 static void imx_irqsteer_irq_handler(struct irq_desc *desc) 107 { 108 struct irqsteer_data *data = irq_desc_get_handler_data(desc); 109 int hwirq; 110 int irq, i; 111 112 chained_irq_enter(irq_desc_get_chip(desc), desc); 113 114 irq = irq_desc_get_irq(desc); 115 hwirq = imx_irqsteer_get_hwirq_base(data, irq); 116 if (hwirq < 0) { 117 pr_warn("%s: unable to get hwirq base for irq %d\n", 118 __func__, irq); 119 return; 120 } 121 122 for (i = 0; i < 2; i++, hwirq += 32) { 123 int idx = imx_irqsteer_get_reg_index(data, hwirq); 124 unsigned long irqmap; 125 int pos; 126 127 if (hwirq >= data->reg_num * 32) 128 break; 129 130 irqmap = readl_relaxed(data->regs + 131 CHANSTATUS(idx, data->reg_num)); 132 133 for_each_set_bit(pos, &irqmap, 32) 134 generic_handle_domain_irq(data->domain, pos + hwirq); 135 } 136 137 chained_irq_exit(irq_desc_get_chip(desc), desc); 138 } 139 140 static int imx_irqsteer_probe(struct platform_device *pdev) 141 { 142 struct device_node *np = pdev->dev.of_node; 143 struct irqsteer_data *data; 144 u32 irqs_num; 145 int i, ret; 146 147 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 148 if (!data) 149 return -ENOMEM; 150 151 data->regs = devm_platform_ioremap_resource(pdev, 0); 152 if (IS_ERR(data->regs)) { 153 dev_err(&pdev->dev, "failed to initialize reg\n"); 154 return PTR_ERR(data->regs); 155 } 156 157 data->ipg_clk = devm_clk_get(&pdev->dev, "ipg"); 158 if (IS_ERR(data->ipg_clk)) 159 return dev_err_probe(&pdev->dev, PTR_ERR(data->ipg_clk), 160 "failed to get ipg clk\n"); 161 162 raw_spin_lock_init(&data->lock); 163 164 ret = of_property_read_u32(np, "fsl,num-irqs", &irqs_num); 165 if (ret) 166 return ret; 167 ret = of_property_read_u32(np, "fsl,channel", &data->channel); 168 if (ret) 169 return ret; 170 171 /* 172 * There is one output irq for each group of 64 inputs. 173 * One register bit map can represent 32 input interrupts. 174 */ 175 data->irq_count = DIV_ROUND_UP(irqs_num, 64); 176 data->reg_num = irqs_num / 32; 177 178 if (IS_ENABLED(CONFIG_PM_SLEEP)) { 179 data->saved_reg = devm_kzalloc(&pdev->dev, 180 sizeof(u32) * data->reg_num, 181 GFP_KERNEL); 182 if (!data->saved_reg) 183 return -ENOMEM; 184 } 185 186 ret = clk_prepare_enable(data->ipg_clk); 187 if (ret) { 188 dev_err(&pdev->dev, "failed to enable ipg clk: %d\n", ret); 189 return ret; 190 } 191 192 /* steer all IRQs into configured channel */ 193 writel_relaxed(BIT(data->channel), data->regs + CHANCTRL); 194 195 data->domain = irq_domain_add_linear(np, data->reg_num * 32, 196 &imx_irqsteer_domain_ops, data); 197 if (!data->domain) { 198 dev_err(&pdev->dev, "failed to create IRQ domain\n"); 199 ret = -ENOMEM; 200 goto out; 201 } 202 203 if (!data->irq_count || data->irq_count > CHAN_MAX_OUTPUT_INT) { 204 ret = -EINVAL; 205 goto out; 206 } 207 208 for (i = 0; i < data->irq_count; i++) { 209 data->irq[i] = irq_of_parse_and_map(np, i); 210 if (!data->irq[i]) { 211 ret = -EINVAL; 212 goto out; 213 } 214 215 irq_set_chained_handler_and_data(data->irq[i], 216 imx_irqsteer_irq_handler, 217 data); 218 } 219 220 platform_set_drvdata(pdev, data); 221 222 return 0; 223 out: 224 clk_disable_unprepare(data->ipg_clk); 225 return ret; 226 } 227 228 static int imx_irqsteer_remove(struct platform_device *pdev) 229 { 230 struct irqsteer_data *irqsteer_data = platform_get_drvdata(pdev); 231 int i; 232 233 for (i = 0; i < irqsteer_data->irq_count; i++) 234 irq_set_chained_handler_and_data(irqsteer_data->irq[i], 235 NULL, NULL); 236 237 irq_domain_remove(irqsteer_data->domain); 238 239 clk_disable_unprepare(irqsteer_data->ipg_clk); 240 241 return 0; 242 } 243 244 #ifdef CONFIG_PM_SLEEP 245 static void imx_irqsteer_save_regs(struct irqsteer_data *data) 246 { 247 int i; 248 249 for (i = 0; i < data->reg_num; i++) 250 data->saved_reg[i] = readl_relaxed(data->regs + 251 CHANMASK(i, data->reg_num)); 252 } 253 254 static void imx_irqsteer_restore_regs(struct irqsteer_data *data) 255 { 256 int i; 257 258 writel_relaxed(BIT(data->channel), data->regs + CHANCTRL); 259 for (i = 0; i < data->reg_num; i++) 260 writel_relaxed(data->saved_reg[i], 261 data->regs + CHANMASK(i, data->reg_num)); 262 } 263 264 static int imx_irqsteer_suspend(struct device *dev) 265 { 266 struct irqsteer_data *irqsteer_data = dev_get_drvdata(dev); 267 268 imx_irqsteer_save_regs(irqsteer_data); 269 clk_disable_unprepare(irqsteer_data->ipg_clk); 270 271 return 0; 272 } 273 274 static int imx_irqsteer_resume(struct device *dev) 275 { 276 struct irqsteer_data *irqsteer_data = dev_get_drvdata(dev); 277 int ret; 278 279 ret = clk_prepare_enable(irqsteer_data->ipg_clk); 280 if (ret) { 281 dev_err(dev, "failed to enable ipg clk: %d\n", ret); 282 return ret; 283 } 284 imx_irqsteer_restore_regs(irqsteer_data); 285 286 return 0; 287 } 288 #endif 289 290 static const struct dev_pm_ops imx_irqsteer_pm_ops = { 291 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_irqsteer_suspend, imx_irqsteer_resume) 292 }; 293 294 static const struct of_device_id imx_irqsteer_dt_ids[] = { 295 { .compatible = "fsl,imx-irqsteer", }, 296 {}, 297 }; 298 299 static struct platform_driver imx_irqsteer_driver = { 300 .driver = { 301 .name = "imx-irqsteer", 302 .of_match_table = imx_irqsteer_dt_ids, 303 .pm = &imx_irqsteer_pm_ops, 304 }, 305 .probe = imx_irqsteer_probe, 306 .remove = imx_irqsteer_remove, 307 }; 308 builtin_platform_driver(imx_irqsteer_driver); 309