1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright 2016 Broadcom Limited
  4 */
  5
  6#include <linux/device.h>
  7#include <linux/io.h>
  8#include <linux/ioport.h>
  9#include <linux/module.h>
 10#include <linux/of.h>
 11#include <linux/of_address.h>
 12#include <linux/platform_device.h>
 13#include <linux/slab.h>
 14
 15#include "spi-bcm-qspi.h"
 16
 17#define INTR_BASE_BIT_SHIFT			0x02
 18#define INTR_COUNT				0x07
 19
 20struct bcm_iproc_intc {
 21	struct bcm_qspi_soc_intc soc_intc;
 22	struct platform_device *pdev;
 23	void __iomem *int_reg;
 24	void __iomem *int_status_reg;
 25	spinlock_t soclock;
 26	bool big_endian;
 27};
 28
 29static u32 bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc *soc_intc)
 30{
 31	struct bcm_iproc_intc *priv =
 32			container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
 33	void __iomem *mmio = priv->int_status_reg;
 34	int i;
 35	u32 val = 0, sts = 0;
 36
 37	for (i = 0; i < INTR_COUNT; i++) {
 38		if (bcm_qspi_readl(priv->big_endian, mmio + (i * 4)))
 39			val |= 1UL << i;
 40	}
 41
 42	if (val & INTR_MSPI_DONE_MASK)
 43		sts |= MSPI_DONE;
 44
 45	if (val & BSPI_LR_INTERRUPTS_ALL)
 46		sts |= BSPI_DONE;
 47
 48	if (val & BSPI_LR_INTERRUPTS_ERROR)
 49		sts |= BSPI_ERR;
 50
 51	return sts;
 52}
 53
 54static void bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc *soc_intc, int type)
 55{
 56	struct bcm_iproc_intc *priv =
 57			container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
 58	void __iomem *mmio = priv->int_status_reg;
 59	u32 mask = get_qspi_mask(type);
 60	int i;
 61
 62	for (i = 0; i < INTR_COUNT; i++) {
 63		if (mask & (1UL << i))
 64			bcm_qspi_writel(priv->big_endian, 1, mmio + (i * 4));
 65	}
 66}
 67
 68static void bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc *soc_intc, int type,
 69				   bool en)
 70{
 71	struct bcm_iproc_intc *priv =
 72			container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
 73	void __iomem *mmio = priv->int_reg;
 74	u32 mask = get_qspi_mask(type);
 75	u32 val;
 76	unsigned long flags;
 77
 78	spin_lock_irqsave(&priv->soclock, flags);
 79
 80	val = bcm_qspi_readl(priv->big_endian, mmio);
 81
 82	if (en)
 83		val = val | (mask << INTR_BASE_BIT_SHIFT);
 84	else
 85		val = val & ~(mask << INTR_BASE_BIT_SHIFT);
 86
 87	bcm_qspi_writel(priv->big_endian, val, mmio);
 88
 89	spin_unlock_irqrestore(&priv->soclock, flags);
 90}
 91
 92static int bcm_iproc_probe(struct platform_device *pdev)
 93{
 94	struct device *dev = &pdev->dev;
 95	struct bcm_iproc_intc *priv;
 96	struct bcm_qspi_soc_intc *soc_intc;
 97
 98	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 99	if (!priv)
100		return -ENOMEM;
101	soc_intc = &priv->soc_intc;
102	priv->pdev = pdev;
103
104	spin_lock_init(&priv->soclock);
105
106	priv->int_reg = devm_platform_ioremap_resource_byname(pdev, "intr_regs");
107	if (IS_ERR(priv->int_reg))
108		return PTR_ERR(priv->int_reg);
109
110	priv->int_status_reg = devm_platform_ioremap_resource_byname(pdev,
111								     "intr_status_reg");
112	if (IS_ERR(priv->int_status_reg))
113		return PTR_ERR(priv->int_status_reg);
114
115	priv->big_endian = of_device_is_big_endian(dev->of_node);
116
117	bcm_iproc_qspi_int_ack(soc_intc, MSPI_BSPI_DONE);
118	bcm_iproc_qspi_int_set(soc_intc, MSPI_BSPI_DONE, false);
119
120	soc_intc->bcm_qspi_int_ack = bcm_iproc_qspi_int_ack;
121	soc_intc->bcm_qspi_int_set = bcm_iproc_qspi_int_set;
122	soc_intc->bcm_qspi_get_int_status = bcm_iproc_qspi_get_l2_int_status;
123
124	return bcm_qspi_probe(pdev, soc_intc);
125}
126
127static void bcm_iproc_remove(struct platform_device *pdev)
128{
129	bcm_qspi_remove(pdev);
130}
131
132static const struct of_device_id bcm_iproc_of_match[] = {
133	{ .compatible = "brcm,spi-nsp-qspi" },
134	{ .compatible = "brcm,spi-ns2-qspi" },
135	{},
136};
137MODULE_DEVICE_TABLE(of, bcm_iproc_of_match);
138
139static struct platform_driver bcm_iproc_driver = {
140	.probe			= bcm_iproc_probe,
141	.remove_new		= bcm_iproc_remove,
142	.driver = {
143		.name		= "bcm_iproc",
144		.pm		= &bcm_qspi_pm_ops,
145		.of_match_table = bcm_iproc_of_match,
146	}
147};
148module_platform_driver(bcm_iproc_driver);
149
150MODULE_LICENSE("GPL v2");
151MODULE_AUTHOR("Kamal Dasu");
152MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs");