^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Multiplexed-IRQs driver for TS-4800's FPGA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2015 - Savoir-faire Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * This file is licensed under the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * License version 2. This program is licensed "as is" without any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * warranty of any kind, whether express or implied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/irqchip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/irqchip/chained_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/irqdomain.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/of_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define IRQ_MASK 0x4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define IRQ_STATUS 0x8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct ts4800_irq_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct irq_domain *domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct irq_chip irq_chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static void ts4800_irq_mask(struct irq_data *d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct ts4800_irq_data *data = irq_data_get_irq_chip_data(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u16 reg = readw(data->base + IRQ_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u16 mask = 1 << d->hwirq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) writew(reg | mask, data->base + IRQ_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static void ts4800_irq_unmask(struct irq_data *d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct ts4800_irq_data *data = irq_data_get_irq_chip_data(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) u16 reg = readw(data->base + IRQ_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) u16 mask = 1 << d->hwirq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) writew(reg & ~mask, data->base + IRQ_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int ts4800_irqdomain_map(struct irq_domain *d, unsigned int irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) irq_hw_number_t hwirq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct ts4800_irq_data *data = d->host_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) irq_set_chip_and_handler(irq, &data->irq_chip, handle_simple_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) irq_set_chip_data(irq, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) irq_set_noprobe(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static const struct irq_domain_ops ts4800_ic_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .map = ts4800_irqdomain_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .xlate = irq_domain_xlate_onecell,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static void ts4800_ic_chained_handle_irq(struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct ts4800_irq_data *data = irq_desc_get_handler_data(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct irq_chip *chip = irq_desc_get_chip(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) u16 status = readw(data->base + IRQ_STATUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) chained_irq_enter(chip, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (unlikely(status == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) handle_bad_irq(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned int bit = __ffs(status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) int irq = irq_find_mapping(data->domain, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) status &= ~(1 << bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) generic_handle_irq(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) } while (status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) chained_irq_exit(chip, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static int ts4800_ic_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct device_node *node = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct ts4800_irq_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct irq_chip *irq_chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int parent_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) data->base = devm_ioremap_resource(&pdev->dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (IS_ERR(data->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return PTR_ERR(data->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) writew(0xFFFF, data->base + IRQ_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) parent_irq = irq_of_parse_and_map(node, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (!parent_irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) dev_err(&pdev->dev, "failed to get parent IRQ\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) irq_chip = &data->irq_chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) irq_chip->name = dev_name(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) irq_chip->irq_mask = ts4800_irq_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) irq_chip->irq_unmask = ts4800_irq_unmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) data->domain = irq_domain_add_linear(node, 8, &ts4800_ic_ops, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (!data->domain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) dev_err(&pdev->dev, "cannot add IRQ domain\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) irq_set_chained_handler_and_data(parent_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ts4800_ic_chained_handle_irq, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) platform_set_drvdata(pdev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static int ts4800_ic_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) struct ts4800_irq_data *data = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) irq_domain_remove(data->domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static const struct of_device_id ts4800_ic_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) { .compatible = "technologic,ts4800-irqc", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) MODULE_DEVICE_TABLE(of, ts4800_ic_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static struct platform_driver ts4800_ic_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .probe = ts4800_ic_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) .remove = ts4800_ic_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .name = "ts4800-irqc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .of_match_table = ts4800_ic_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) module_platform_driver(ts4800_ic_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) MODULE_AUTHOR("Damien Riegel <damien.riegel@savoirfairelinux.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) MODULE_ALIAS("platform:ts4800_irqc");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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