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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2021 Western Digital Corporation or its affiliates.
4  * Copyright (C) 2022 Ventana Micro Systems Inc.
5  */
6
7 #include <linux/acpi.h>
8 #include <linux/bitfield.h>
9 #include <linux/irqchip/riscv-aplic.h>
10 #include <linux/irqchip/riscv-imsic.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_irq.h>
14 #include <linux/platform_device.h>
15 #include <linux/printk.h>
16
17 #include "irq-riscv-aplic-main.h"
18
19 void aplic_irq_unmask(struct irq_data *d)
20 {
21         struct aplic_priv *priv = irq_data_get_irq_chip_data(d);
22
23         writel(d->hwirq, priv->regs + APLIC_SETIENUM);
24 }
25
26 void aplic_irq_mask(struct irq_data *d)
27 {
28         struct aplic_priv *priv = irq_data_get_irq_chip_data(d);
29
30         writel(d->hwirq, priv->regs + APLIC_CLRIENUM);
31 }
32
33 int aplic_irq_set_type(struct irq_data *d, unsigned int type)
34 {
35         struct aplic_priv *priv = irq_data_get_irq_chip_data(d);
36         void __iomem *sourcecfg;
37         u32 val = 0;
38
39         switch (type) {
40         case IRQ_TYPE_NONE:
41                 val = APLIC_SOURCECFG_SM_INACTIVE;
42                 break;
43         case IRQ_TYPE_LEVEL_LOW:
44                 val = APLIC_SOURCECFG_SM_LEVEL_LOW;
45                 break;
46         case IRQ_TYPE_LEVEL_HIGH:
47                 val = APLIC_SOURCECFG_SM_LEVEL_HIGH;
48                 break;
49         case IRQ_TYPE_EDGE_FALLING:
50                 val = APLIC_SOURCECFG_SM_EDGE_FALL;
51                 break;
52         case IRQ_TYPE_EDGE_RISING:
53                 val = APLIC_SOURCECFG_SM_EDGE_RISE;
54                 break;
55         default:
56                 return -EINVAL;
57         }
58
59         sourcecfg = priv->regs + APLIC_SOURCECFG_BASE;
60         sourcecfg += (d->hwirq - 1) * sizeof(u32);
61         writel(val, sourcecfg);
62
63         return 0;
64 }
65
66 int aplic_irqdomain_translate(struct irq_fwspec *fwspec, u32 gsi_base,
67                               unsigned long *hwirq, unsigned int *type)
68 {
69         if (WARN_ON(fwspec->param_count < 2))
70                 return -EINVAL;
71         if (WARN_ON(!fwspec->param[0]))
72                 return -EINVAL;
73
74         /* For DT, gsi_base is always zero. */
75         *hwirq = fwspec->param[0] - gsi_base;
76         *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
77
78         WARN_ON(*type == IRQ_TYPE_NONE);
79
80         return 0;
81 }
82
83 void aplic_init_hw_global(struct aplic_priv *priv, bool msi_mode)
84 {
85         u32 val;
86 #ifdef CONFIG_RISCV_M_MODE
87         u32 valh;
88
89         if (msi_mode) {
90                 val = lower_32_bits(priv->msicfg.base_ppn);
91                 valh = FIELD_PREP(APLIC_xMSICFGADDRH_BAPPN, upper_32_bits(priv->msicfg.base_ppn));
92                 valh |= FIELD_PREP(APLIC_xMSICFGADDRH_LHXW, priv->msicfg.lhxw);
93                 valh |= FIELD_PREP(APLIC_xMSICFGADDRH_HHXW, priv->msicfg.hhxw);
94                 valh |= FIELD_PREP(APLIC_xMSICFGADDRH_LHXS, priv->msicfg.lhxs);
95                 valh |= FIELD_PREP(APLIC_xMSICFGADDRH_HHXS, priv->msicfg.hhxs);
96                 writel(val, priv->regs + APLIC_xMSICFGADDR);
97                 writel(valh, priv->regs + APLIC_xMSICFGADDRH);
98         }
99 #endif
100
101         /* Setup APLIC domaincfg register */
102         val = readl(priv->regs + APLIC_DOMAINCFG);
103         val |= APLIC_DOMAINCFG_IE;
104         if (msi_mode)
105                 val |= APLIC_DOMAINCFG_DM;
106         writel(val, priv->regs + APLIC_DOMAINCFG);
107         if (readl(priv->regs + APLIC_DOMAINCFG) != val)
108                 dev_warn(priv->dev, "unable to write 0x%x in domaincfg\n", val);
109 }
110
111 static void aplic_init_hw_irqs(struct aplic_priv *priv)
112 {
113         int i;
114
115         /* Disable all interrupts */
116         for (i = 0; i <= priv->nr_irqs; i += 32)
117                 writel(-1U, priv->regs + APLIC_CLRIE_BASE + (i / 32) * sizeof(u32));
118
119         /* Set interrupt type and default priority for all interrupts */
120         for (i = 1; i <= priv->nr_irqs; i++) {
121                 writel(0, priv->regs + APLIC_SOURCECFG_BASE + (i - 1) * sizeof(u32));
122                 writel(APLIC_DEFAULT_PRIORITY,
123                        priv->regs + APLIC_TARGET_BASE + (i - 1) * sizeof(u32));
124         }
125
126         /* Clear APLIC domaincfg */
127         writel(0, priv->regs + APLIC_DOMAINCFG);
128 }
129
130 #ifdef CONFIG_ACPI
131 static const struct acpi_device_id aplic_acpi_match[] = {
132         { "RSCV0002", 0 },
133         {}
134 };
135 MODULE_DEVICE_TABLE(acpi, aplic_acpi_match);
136
137 #endif
138
139 int aplic_setup_priv(struct aplic_priv *priv, struct device *dev, void __iomem *regs)
140 {
141         struct device_node *np = to_of_node(dev->fwnode);
142         struct of_phandle_args parent;
143         int rc;
144
145         /* Save device pointer and register base */
146         priv->dev = dev;
147         priv->regs = regs;
148
149         if (np) {
150                 /* Find out number of interrupt sources */
151                 rc = of_property_read_u32(np, "riscv,num-sources", &priv->nr_irqs);
152                 if (rc) {
153                         dev_err(dev, "failed to get number of interrupt sources\n");
154                         return rc;
155                 }
156
157                 /*
158                  * Find out number of IDCs based on parent interrupts
159                  *
160                  * If "msi-parent" property is present then we ignore the
161                  * APLIC IDCs which forces the APLIC driver to use MSI mode.
162                  */
163                 if (!of_property_present(np, "msi-parent")) {
164                         while (!of_irq_parse_one(np, priv->nr_idcs, &parent))
165                                 priv->nr_idcs++;
166                 }
167         } else {
168                 rc = riscv_acpi_get_gsi_info(dev->fwnode, &priv->gsi_base, &priv->acpi_aplic_id,
169                                              &priv->nr_irqs, &priv->nr_idcs);
170                 if (rc) {
171                         dev_err(dev, "failed to find GSI mapping\n");
172                         return rc;
173                 }
174         }
175
176         /* Setup initial state APLIC interrupts */
177         aplic_init_hw_irqs(priv);
178
179         return 0;
180 }
181
182 static int aplic_probe(struct platform_device *pdev)
183 {
184         struct device *dev = &pdev->dev;
185         bool msi_mode = false;
186         void __iomem *regs;
187         int rc;
188
189         /* Map the MMIO registers */
190         regs = devm_platform_ioremap_resource(pdev, 0);
191         if (IS_ERR(regs)) {
192                 dev_err(dev, "failed map MMIO registers\n");
193                 return PTR_ERR(regs);
194         }
195
196         /*
197          * If msi-parent property is present then setup APLIC MSI
198          * mode otherwise setup APLIC direct mode.
199          */
200         if (is_of_node(dev->fwnode))
201                 msi_mode = of_property_present(to_of_node(dev->fwnode), "msi-parent");
202         else
203                 msi_mode = imsic_acpi_get_fwnode(NULL) ? 1 : 0;
204
205         if (msi_mode)
206                 rc = aplic_msi_setup(dev, regs);
207         else
208                 rc = aplic_direct_setup(dev, regs);
209         if (rc)
210                 dev_err(dev, "failed to setup APLIC in %s mode\n", msi_mode ? "MSI" : "direct");
211
212 #ifdef CONFIG_ACPI
213         if (!acpi_disabled)
214                 acpi_dev_clear_dependencies(ACPI_COMPANION(dev));
215 #endif
216
217         return rc;
218 }
219
220 static const struct of_device_id aplic_match[] = {
221         { .compatible = "riscv,aplic" },
222         {}
223 };
224
225 static struct platform_driver aplic_driver = {
226         .driver = {
227                 .name           = "riscv-aplic",
228                 .of_match_table = aplic_match,
229                 .acpi_match_table = ACPI_PTR(aplic_acpi_match),
230         },
231         .probe = aplic_probe,
232 };
233 builtin_platform_driver(aplic_driver);
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