]>
Commit | Line | Data |
---|---|---|
6b2e54f7 HW |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (c) 2018, Nuvoton Corporation. | |
4 | * Copyright (c) 2018, Intel Corporation. | |
5 | */ | |
6 | ||
7 | #define pr_fmt(fmt) "nuvoton-kcs-bmc: " fmt | |
8 | ||
9 | #include <linux/atomic.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/mfd/syscon.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/regmap.h> | |
18 | #include <linux/slab.h> | |
19 | ||
20 | #include "kcs_bmc.h" | |
21 | ||
22 | #define DEVICE_NAME "npcm-kcs-bmc" | |
23 | #define KCS_CHANNEL_MAX 3 | |
24 | ||
25 | #define KCS1ST 0x0C | |
26 | #define KCS2ST 0x1E | |
27 | #define KCS3ST 0x30 | |
28 | ||
29 | #define KCS1DO 0x0E | |
30 | #define KCS2DO 0x20 | |
31 | #define KCS3DO 0x32 | |
32 | ||
33 | #define KCS1DI 0x10 | |
34 | #define KCS2DI 0x22 | |
35 | #define KCS3DI 0x34 | |
36 | ||
37 | #define KCS1CTL 0x18 | |
38 | #define KCS2CTL 0x2A | |
39 | #define KCS3CTL 0x3C | |
40 | #define KCS_CTL_IBFIE BIT(0) | |
41 | ||
58aae18e AF |
42 | #define KCS1IE 0x1C |
43 | #define KCS2IE 0x2E | |
44 | #define KCS3IE 0x40 | |
45 | #define KCS_IE_IRQE BIT(0) | |
46 | #define KCS_IE_HIRQE BIT(3) | |
47 | ||
6b2e54f7 HW |
48 | /* |
49 | * 7.2.4 Core KCS Registers | |
50 | * Registers in this module are 8 bits. An 8-bit register must be accessed | |
51 | * by an 8-bit read or write. | |
52 | * | |
53 | * sts: KCS Channel n Status Register (KCSnST). | |
54 | * dob: KCS Channel n Data Out Buffer Register (KCSnDO). | |
55 | * dib: KCS Channel n Data In Buffer Register (KCSnDI). | |
56 | * ctl: KCS Channel n Control Register (KCSnCTL). | |
58aae18e | 57 | * ie : KCS Channel n Interrupt Enable Register (KCSnIE). |
6b2e54f7 HW |
58 | */ |
59 | struct npcm7xx_kcs_reg { | |
60 | u32 sts; | |
61 | u32 dob; | |
62 | u32 dib; | |
63 | u32 ctl; | |
58aae18e | 64 | u32 ie; |
6b2e54f7 HW |
65 | }; |
66 | ||
67 | struct npcm7xx_kcs_bmc { | |
68 | struct regmap *map; | |
69 | ||
70 | const struct npcm7xx_kcs_reg *reg; | |
71 | }; | |
72 | ||
73 | static const struct npcm7xx_kcs_reg npcm7xx_kcs_reg_tbl[KCS_CHANNEL_MAX] = { | |
58aae18e AF |
74 | { .sts = KCS1ST, .dob = KCS1DO, .dib = KCS1DI, .ctl = KCS1CTL, .ie = KCS1IE }, |
75 | { .sts = KCS2ST, .dob = KCS2DO, .dib = KCS2DI, .ctl = KCS2CTL, .ie = KCS2IE }, | |
76 | { .sts = KCS3ST, .dob = KCS3DO, .dib = KCS3DI, .ctl = KCS3CTL, .ie = KCS3IE }, | |
6b2e54f7 HW |
77 | }; |
78 | ||
79 | static u8 npcm7xx_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg) | |
80 | { | |
81 | struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc); | |
82 | u32 val = 0; | |
83 | int rc; | |
84 | ||
85 | rc = regmap_read(priv->map, reg, &val); | |
86 | WARN(rc != 0, "regmap_read() failed: %d\n", rc); | |
87 | ||
88 | return rc == 0 ? (u8)val : 0; | |
89 | } | |
90 | ||
91 | static void npcm7xx_kcs_outb(struct kcs_bmc *kcs_bmc, u32 reg, u8 data) | |
92 | { | |
93 | struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc); | |
94 | int rc; | |
95 | ||
96 | rc = regmap_write(priv->map, reg, data); | |
97 | WARN(rc != 0, "regmap_write() failed: %d\n", rc); | |
98 | } | |
99 | ||
100 | static void npcm7xx_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable) | |
101 | { | |
102 | struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc); | |
103 | ||
104 | regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_IBFIE, | |
105 | enable ? KCS_CTL_IBFIE : 0); | |
58aae18e AF |
106 | |
107 | regmap_update_bits(priv->map, priv->reg->ie, KCS_IE_IRQE | KCS_IE_HIRQE, | |
108 | enable ? KCS_IE_IRQE | KCS_IE_HIRQE : 0); | |
6b2e54f7 HW |
109 | } |
110 | ||
111 | static irqreturn_t npcm7xx_kcs_irq(int irq, void *arg) | |
112 | { | |
113 | struct kcs_bmc *kcs_bmc = arg; | |
114 | ||
115 | if (!kcs_bmc_handle_event(kcs_bmc)) | |
116 | return IRQ_HANDLED; | |
117 | ||
118 | return IRQ_NONE; | |
119 | } | |
120 | ||
121 | static int npcm7xx_kcs_config_irq(struct kcs_bmc *kcs_bmc, | |
122 | struct platform_device *pdev) | |
123 | { | |
124 | struct device *dev = &pdev->dev; | |
125 | int irq; | |
126 | ||
127 | irq = platform_get_irq(pdev, 0); | |
128 | if (irq < 0) | |
129 | return irq; | |
130 | ||
131 | return devm_request_irq(dev, irq, npcm7xx_kcs_irq, IRQF_SHARED, | |
132 | dev_name(dev), kcs_bmc); | |
133 | } | |
134 | ||
135 | static int npcm7xx_kcs_probe(struct platform_device *pdev) | |
136 | { | |
137 | struct device *dev = &pdev->dev; | |
138 | struct npcm7xx_kcs_bmc *priv; | |
139 | struct kcs_bmc *kcs_bmc; | |
140 | u32 chan; | |
141 | int rc; | |
142 | ||
143 | rc = of_property_read_u32(dev->of_node, "kcs_chan", &chan); | |
144 | if (rc != 0 || chan == 0 || chan > KCS_CHANNEL_MAX) { | |
145 | dev_err(dev, "no valid 'kcs_chan' configured\n"); | |
146 | return -ENODEV; | |
147 | } | |
148 | ||
149 | kcs_bmc = kcs_bmc_alloc(dev, sizeof(*priv), chan); | |
150 | if (!kcs_bmc) | |
151 | return -ENOMEM; | |
152 | ||
153 | priv = kcs_bmc_priv(kcs_bmc); | |
154 | priv->map = syscon_node_to_regmap(dev->parent->of_node); | |
155 | if (IS_ERR(priv->map)) { | |
156 | dev_err(dev, "Couldn't get regmap\n"); | |
157 | return -ENODEV; | |
158 | } | |
159 | priv->reg = &npcm7xx_kcs_reg_tbl[chan - 1]; | |
160 | ||
161 | kcs_bmc->ioreg.idr = priv->reg->dib; | |
162 | kcs_bmc->ioreg.odr = priv->reg->dob; | |
163 | kcs_bmc->ioreg.str = priv->reg->sts; | |
164 | kcs_bmc->io_inputb = npcm7xx_kcs_inb; | |
165 | kcs_bmc->io_outputb = npcm7xx_kcs_outb; | |
166 | ||
167 | dev_set_drvdata(dev, kcs_bmc); | |
168 | ||
169 | npcm7xx_kcs_enable_channel(kcs_bmc, true); | |
170 | rc = npcm7xx_kcs_config_irq(kcs_bmc, pdev); | |
171 | if (rc) | |
172 | return rc; | |
173 | ||
174 | rc = misc_register(&kcs_bmc->miscdev); | |
175 | if (rc) { | |
176 | dev_err(dev, "Unable to register device\n"); | |
177 | return rc; | |
178 | } | |
179 | ||
180 | pr_info("channel=%u idr=0x%x odr=0x%x str=0x%x\n", | |
181 | chan, | |
182 | kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr, kcs_bmc->ioreg.str); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static int npcm7xx_kcs_remove(struct platform_device *pdev) | |
188 | { | |
189 | struct kcs_bmc *kcs_bmc = dev_get_drvdata(&pdev->dev); | |
190 | ||
191 | misc_deregister(&kcs_bmc->miscdev); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static const struct of_device_id npcm_kcs_bmc_match[] = { | |
197 | { .compatible = "nuvoton,npcm750-kcs-bmc" }, | |
198 | { } | |
199 | }; | |
200 | MODULE_DEVICE_TABLE(of, npcm_kcs_bmc_match); | |
201 | ||
202 | static struct platform_driver npcm_kcs_bmc_driver = { | |
203 | .driver = { | |
204 | .name = DEVICE_NAME, | |
205 | .of_match_table = npcm_kcs_bmc_match, | |
206 | }, | |
207 | .probe = npcm7xx_kcs_probe, | |
208 | .remove = npcm7xx_kcs_remove, | |
209 | }; | |
210 | module_platform_driver(npcm_kcs_bmc_driver); | |
211 | ||
212 | MODULE_LICENSE("GPL v2"); | |
213 | MODULE_AUTHOR("Avi Fishman <avifishman70@gmail.com>"); | |
214 | MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>"); | |
215 | MODULE_DESCRIPTION("NPCM7xx device interface to the KCS BMC device"); |