xref: /openbmc/linux/drivers/spi/spi-iproc-qspi.c (revision 246f74bb)
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 
20 struct 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 
bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc * soc_intc)29 static 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 
bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc * soc_intc,int type)54 static 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 
bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc * soc_intc,int type,bool en)68 static 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 
bcm_iproc_probe(struct platform_device * pdev)92 static 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 
bcm_iproc_remove(struct platform_device * pdev)127 static void bcm_iproc_remove(struct platform_device *pdev)
128 {
129 	bcm_qspi_remove(pdev);
130 }
131 
132 static const struct of_device_id bcm_iproc_of_match[] = {
133 	{ .compatible = "brcm,spi-nsp-qspi" },
134 	{ .compatible = "brcm,spi-ns2-qspi" },
135 	{},
136 };
137 MODULE_DEVICE_TABLE(of, bcm_iproc_of_match);
138 
139 static 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 };
148 module_platform_driver(bcm_iproc_driver);
149 
150 MODULE_LICENSE("GPL v2");
151 MODULE_AUTHOR("Kamal Dasu");
152 MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs");
153