GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / spi / spi-iproc-qspi.c
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
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
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
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
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         struct resource *res;
98
99         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
100         if (!priv)
101                 return -ENOMEM;
102         soc_intc = &priv->soc_intc;
103         priv->pdev = pdev;
104
105         spin_lock_init(&priv->soclock);
106
107         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr_regs");
108         priv->int_reg = devm_ioremap_resource(dev, res);
109         if (IS_ERR(priv->int_reg))
110                 return PTR_ERR(priv->int_reg);
111
112         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
113                                            "intr_status_reg");
114         priv->int_status_reg = devm_ioremap_resource(dev, res);
115         if (IS_ERR(priv->int_status_reg))
116                 return PTR_ERR(priv->int_status_reg);
117
118         priv->big_endian = of_device_is_big_endian(dev->of_node);
119
120         bcm_iproc_qspi_int_ack(soc_intc, MSPI_BSPI_DONE);
121         bcm_iproc_qspi_int_set(soc_intc, MSPI_BSPI_DONE, false);
122
123         soc_intc->bcm_qspi_int_ack = bcm_iproc_qspi_int_ack;
124         soc_intc->bcm_qspi_int_set = bcm_iproc_qspi_int_set;
125         soc_intc->bcm_qspi_get_int_status = bcm_iproc_qspi_get_l2_int_status;
126
127         return bcm_qspi_probe(pdev, soc_intc);
128 }
129
130 static int bcm_iproc_remove(struct platform_device *pdev)
131 {
132         return bcm_qspi_remove(pdev);
133 }
134
135 static const struct of_device_id bcm_iproc_of_match[] = {
136         { .compatible = "brcm,spi-nsp-qspi" },
137         { .compatible = "brcm,spi-ns2-qspi" },
138         {},
139 };
140 MODULE_DEVICE_TABLE(of, bcm_iproc_of_match);
141
142 static struct platform_driver bcm_iproc_driver = {
143         .probe                  = bcm_iproc_probe,
144         .remove                 = bcm_iproc_remove,
145         .driver = {
146                 .name           = "bcm_iproc",
147                 .pm             = &bcm_qspi_pm_ops,
148                 .of_match_table = bcm_iproc_of_match,
149         }
150 };
151 module_platform_driver(bcm_iproc_driver);
152
153 MODULE_LICENSE("GPL v2");
154 MODULE_AUTHOR("Kamal Dasu");
155 MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs");