cpm1-ic.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Interrupt controller for the
  4 * Communication Processor Module.
  5 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
  6 */
  7#include <linux/kernel.h>
  8#include <linux/interrupt.h>
  9#include <linux/irqdomain.h>
 10#include <linux/platform_device.h>
 11#include <asm/cpm1.h>
 12
 13struct cpm_pic_data {
 14	cpic8xx_t __iomem *reg;
 15	struct irq_domain *host;
 16};
 17
 18static void cpm_mask_irq(struct irq_data *d)
 19{
 20	struct cpm_pic_data *data = irq_data_get_irq_chip_data(d);
 21	unsigned int cpm_vec = (unsigned int)irqd_to_hwirq(d);
 22
 23	clrbits32(&data->reg->cpic_cimr, (1 << cpm_vec));
 24}
 25
 26static void cpm_unmask_irq(struct irq_data *d)
 27{
 28	struct cpm_pic_data *data = irq_data_get_irq_chip_data(d);
 29	unsigned int cpm_vec = (unsigned int)irqd_to_hwirq(d);
 30
 31	setbits32(&data->reg->cpic_cimr, (1 << cpm_vec));
 32}
 33
 34static void cpm_end_irq(struct irq_data *d)
 35{
 36	struct cpm_pic_data *data = irq_data_get_irq_chip_data(d);
 37	unsigned int cpm_vec = (unsigned int)irqd_to_hwirq(d);
 38
 39	out_be32(&data->reg->cpic_cisr, (1 << cpm_vec));
 40}
 41
 42static struct irq_chip cpm_pic = {
 43	.name = "CPM PIC",
 44	.irq_mask = cpm_mask_irq,
 45	.irq_unmask = cpm_unmask_irq,
 46	.irq_eoi = cpm_end_irq,
 47};
 48
 49static int cpm_get_irq(struct irq_desc *desc)
 50{
 51	struct cpm_pic_data *data = irq_desc_get_handler_data(desc);
 52	int cpm_vec;
 53
 54	/*
 55	 * Get the vector by setting the ACK bit and then reading
 56	 * the register.
 57	 */
 58	out_be16(&data->reg->cpic_civr, 1);
 59	cpm_vec = in_be16(&data->reg->cpic_civr);
 60	cpm_vec >>= 11;
 61
 62	return irq_find_mapping(data->host, cpm_vec);
 63}
 64
 65static void cpm_cascade(struct irq_desc *desc)
 66{
 67	generic_handle_irq(cpm_get_irq(desc));
 68}
 69
 70static int cpm_pic_host_map(struct irq_domain *h, unsigned int virq,
 71			    irq_hw_number_t hw)
 72{
 73	irq_set_chip_data(virq, h->host_data);
 74	irq_set_status_flags(virq, IRQ_LEVEL);
 75	irq_set_chip_and_handler(virq, &cpm_pic, handle_fasteoi_irq);
 76	return 0;
 77}
 78
 79static const struct irq_domain_ops cpm_pic_host_ops = {
 80	.map = cpm_pic_host_map,
 81};
 82
 83static int cpm_pic_probe(struct platform_device *pdev)
 84{
 85	struct device *dev = &pdev->dev;
 86	struct resource *res;
 87	int irq;
 88	struct cpm_pic_data *data;
 89
 90	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 91	if (!res)
 92		return -ENODEV;
 93
 94	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 95	if (!data)
 96		return -ENOMEM;
 97
 98	data->reg = devm_ioremap(dev, res->start, resource_size(res));
 99	if (!data->reg)
100		return -ENODEV;
101
102	irq = platform_get_irq(pdev, 0);
103	if (irq < 0)
104		return irq;
105
106	/* Initialize the CPM interrupt controller. */
107	out_be32(&data->reg->cpic_cicr,
108		 (CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) |
109		 ((virq_to_hw(irq) / 2) << 13) | CICR_HP_MASK);
110
111	out_be32(&data->reg->cpic_cimr, 0);
112
113	data->host = irq_domain_create_linear(dev_fwnode(dev), 64, &cpm_pic_host_ops, data);
114	if (!data->host)
115		return -ENODEV;
116
117	irq_set_handler_data(irq, data);
118	irq_set_chained_handler(irq, cpm_cascade);
119
120	setbits32(&data->reg->cpic_cicr, CICR_IEN);
121
122	return 0;
123}
124
125static const struct of_device_id cpm_pic_match[] = {
126	{
127		.compatible = "fsl,cpm1-pic",
128	}, {
129		.type = "cpm-pic",
130		.compatible = "CPM",
131	}, {},
132};
133
134static struct platform_driver cpm_pic_driver = {
135	.driver	= {
136		.name		= "cpm-pic",
137		.of_match_table	= cpm_pic_match,
138	},
139	.probe	= cpm_pic_probe,
140};
141
142static int __init cpm_pic_init(void)
143{
144	return platform_driver_register(&cpm_pic_driver);
145}
146arch_initcall(cpm_pic_init);
147
148/*
149 * The CPM can generate the error interrupt when there is a race condition
150 * between generating and masking interrupts.  All we have to do is ACK it
151 * and return.  This is a no-op function so we don't need any special
152 * tests in the interrupt handler.
153 */
154static irqreturn_t cpm_error_interrupt(int irq, void *dev)
155{
156	return IRQ_HANDLED;
157}
158
159static int cpm_error_probe(struct platform_device *pdev)
160{
161	int irq;
162
163	irq = platform_get_irq(pdev, 0);
164	if (irq < 0)
165		return irq;
166
167	return request_irq(irq, cpm_error_interrupt, IRQF_NO_THREAD, "error", NULL);
168}
169
170static const struct of_device_id cpm_error_ids[] = {
171	{ .compatible = "fsl,cpm1" },
172	{ .type = "cpm" },
173	{},
174};
175
176static struct platform_driver cpm_error_driver = {
177	.driver	= {
178		.name		= "cpm-error",
179		.of_match_table	= cpm_error_ids,
180	},
181	.probe	= cpm_error_probe,
182};
183
184static int __init cpm_error_init(void)
185{
186	return platform_driver_register(&cpm_error_driver);
187}
188subsys_initcall(cpm_error_init);