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d342571e RV |
1 | #include <linux/kernel.h> |
2 | #include <linux/init.h> | |
3 | #include <linux/gpio.h> | |
4 | #include <linux/of_gpio.h> | |
5 | #include <linux/io.h> | |
6 | #include <linux/platform_device.h> | |
7 | #include <linux/basic_mmio_gpio.h> | |
8 | ||
9 | #define ETRAX_FS_rw_pa_dout 0 | |
10 | #define ETRAX_FS_r_pa_din 4 | |
11 | #define ETRAX_FS_rw_pa_oe 8 | |
12 | #define ETRAX_FS_rw_intr_cfg 12 | |
13 | #define ETRAX_FS_rw_intr_mask 16 | |
14 | #define ETRAX_FS_rw_ack_intr 20 | |
15 | #define ETRAX_FS_r_intr 24 | |
16 | #define ETRAX_FS_rw_pb_dout 32 | |
17 | #define ETRAX_FS_r_pb_din 36 | |
18 | #define ETRAX_FS_rw_pb_oe 40 | |
19 | #define ETRAX_FS_rw_pc_dout 48 | |
20 | #define ETRAX_FS_r_pc_din 52 | |
21 | #define ETRAX_FS_rw_pc_oe 56 | |
22 | #define ETRAX_FS_rw_pd_dout 64 | |
23 | #define ETRAX_FS_r_pd_din 68 | |
24 | #define ETRAX_FS_rw_pd_oe 72 | |
25 | #define ETRAX_FS_rw_pe_dout 80 | |
26 | #define ETRAX_FS_r_pe_din 84 | |
27 | #define ETRAX_FS_rw_pe_oe 88 | |
28 | ||
d705073c RV |
29 | #define ARTPEC3_r_pa_din 0 |
30 | #define ARTPEC3_rw_pa_dout 4 | |
31 | #define ARTPEC3_rw_pa_oe 8 | |
32 | #define ARTPEC3_r_pb_din 44 | |
33 | #define ARTPEC3_rw_pb_dout 48 | |
34 | #define ARTPEC3_rw_pb_oe 52 | |
35 | #define ARTPEC3_r_pc_din 88 | |
36 | #define ARTPEC3_rw_pc_dout 92 | |
37 | #define ARTPEC3_rw_pc_oe 96 | |
38 | #define ARTPEC3_r_pd_din 116 | |
39 | ||
d342571e RV |
40 | struct etraxfs_gpio_port { |
41 | const char *label; | |
42 | unsigned int oe; | |
43 | unsigned int dout; | |
44 | unsigned int din; | |
45 | unsigned int ngpio; | |
46 | }; | |
47 | ||
48 | struct etraxfs_gpio_info { | |
49 | unsigned int num_ports; | |
50 | const struct etraxfs_gpio_port *ports; | |
51 | }; | |
52 | ||
53 | static const struct etraxfs_gpio_port etraxfs_gpio_etraxfs_ports[] = { | |
54 | { | |
55 | .label = "A", | |
56 | .ngpio = 8, | |
57 | .oe = ETRAX_FS_rw_pa_oe, | |
58 | .dout = ETRAX_FS_rw_pa_dout, | |
59 | .din = ETRAX_FS_r_pa_din, | |
60 | }, | |
61 | { | |
62 | .label = "B", | |
63 | .ngpio = 18, | |
64 | .oe = ETRAX_FS_rw_pb_oe, | |
65 | .dout = ETRAX_FS_rw_pb_dout, | |
66 | .din = ETRAX_FS_r_pb_din, | |
67 | }, | |
68 | { | |
69 | .label = "C", | |
70 | .ngpio = 18, | |
71 | .oe = ETRAX_FS_rw_pc_oe, | |
72 | .dout = ETRAX_FS_rw_pc_dout, | |
73 | .din = ETRAX_FS_r_pc_din, | |
74 | }, | |
75 | { | |
76 | .label = "D", | |
77 | .ngpio = 18, | |
78 | .oe = ETRAX_FS_rw_pd_oe, | |
79 | .dout = ETRAX_FS_rw_pd_dout, | |
80 | .din = ETRAX_FS_r_pd_din, | |
81 | }, | |
82 | { | |
83 | .label = "E", | |
84 | .ngpio = 18, | |
85 | .oe = ETRAX_FS_rw_pe_oe, | |
86 | .dout = ETRAX_FS_rw_pe_dout, | |
87 | .din = ETRAX_FS_r_pe_din, | |
88 | }, | |
89 | }; | |
90 | ||
91 | static const struct etraxfs_gpio_info etraxfs_gpio_etraxfs = { | |
92 | .num_ports = ARRAY_SIZE(etraxfs_gpio_etraxfs_ports), | |
93 | .ports = etraxfs_gpio_etraxfs_ports, | |
94 | }; | |
95 | ||
d705073c RV |
96 | static const struct etraxfs_gpio_port etraxfs_gpio_artpec3_ports[] = { |
97 | { | |
98 | .label = "A", | |
99 | .ngpio = 32, | |
100 | .oe = ARTPEC3_rw_pa_oe, | |
101 | .dout = ARTPEC3_rw_pa_dout, | |
102 | .din = ARTPEC3_r_pa_din, | |
103 | }, | |
104 | { | |
105 | .label = "B", | |
106 | .ngpio = 32, | |
107 | .oe = ARTPEC3_rw_pb_oe, | |
108 | .dout = ARTPEC3_rw_pb_dout, | |
109 | .din = ARTPEC3_r_pb_din, | |
110 | }, | |
111 | { | |
112 | .label = "C", | |
113 | .ngpio = 16, | |
114 | .oe = ARTPEC3_rw_pc_oe, | |
115 | .dout = ARTPEC3_rw_pc_dout, | |
116 | .din = ARTPEC3_r_pc_din, | |
117 | }, | |
118 | { | |
119 | .label = "D", | |
120 | .ngpio = 32, | |
121 | .din = ARTPEC3_r_pd_din, | |
122 | }, | |
123 | }; | |
124 | ||
125 | static const struct etraxfs_gpio_info etraxfs_gpio_artpec3 = { | |
126 | .num_ports = ARRAY_SIZE(etraxfs_gpio_artpec3_ports), | |
127 | .ports = etraxfs_gpio_artpec3_ports, | |
128 | }; | |
129 | ||
d342571e RV |
130 | static int etraxfs_gpio_of_xlate(struct gpio_chip *gc, |
131 | const struct of_phandle_args *gpiospec, | |
132 | u32 *flags) | |
133 | { | |
134 | /* | |
135 | * Port numbers are A to E, and the properties are integers, so we | |
136 | * specify them as 0xA - 0xE. | |
137 | */ | |
138 | if (gc->label[0] - 'A' + 0xA != gpiospec->args[2]) | |
139 | return -EINVAL; | |
140 | ||
141 | return of_gpio_simple_xlate(gc, gpiospec, flags); | |
142 | } | |
143 | ||
144 | static const struct of_device_id etraxfs_gpio_of_table[] = { | |
145 | { | |
146 | .compatible = "axis,etraxfs-gio", | |
147 | .data = &etraxfs_gpio_etraxfs, | |
148 | }, | |
d705073c RV |
149 | { |
150 | .compatible = "axis,artpec3-gio", | |
151 | .data = &etraxfs_gpio_artpec3, | |
152 | }, | |
d342571e RV |
153 | {}, |
154 | }; | |
155 | ||
156 | static int etraxfs_gpio_probe(struct platform_device *pdev) | |
157 | { | |
158 | struct device *dev = &pdev->dev; | |
159 | const struct etraxfs_gpio_info *info; | |
160 | const struct of_device_id *match; | |
161 | struct bgpio_chip *chips; | |
162 | struct resource *res; | |
163 | void __iomem *regs; | |
164 | int ret; | |
165 | int i; | |
166 | ||
167 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
168 | regs = devm_ioremap_resource(dev, res); | |
01540314 KK |
169 | if (IS_ERR(regs)) |
170 | return PTR_ERR(regs); | |
d342571e RV |
171 | |
172 | match = of_match_node(etraxfs_gpio_of_table, dev->of_node); | |
173 | if (!match) | |
174 | return -EINVAL; | |
175 | ||
176 | info = match->data; | |
177 | ||
178 | chips = devm_kzalloc(dev, sizeof(*chips) * info->num_ports, GFP_KERNEL); | |
179 | if (!chips) | |
180 | return -ENOMEM; | |
181 | ||
182 | for (i = 0; i < info->num_ports; i++) { | |
183 | struct bgpio_chip *bgc = &chips[i]; | |
184 | const struct etraxfs_gpio_port *port = &info->ports[i]; | |
d705073c RV |
185 | unsigned long flags = BGPIOF_READ_OUTPUT_REG_SET; |
186 | void __iomem *dat = regs + port->din; | |
187 | void __iomem *set = regs + port->dout; | |
188 | void __iomem *dirout = regs + port->oe; | |
189 | ||
190 | if (dirout == set) { | |
191 | dirout = set = NULL; | |
192 | flags = BGPIOF_NO_OUTPUT; | |
193 | } | |
d342571e RV |
194 | |
195 | ret = bgpio_init(bgc, dev, 4, | |
d705073c RV |
196 | dat, set, NULL, dirout, NULL, |
197 | flags); | |
d342571e RV |
198 | if (ret) |
199 | return ret; | |
200 | ||
201 | bgc->gc.ngpio = port->ngpio; | |
202 | bgc->gc.label = port->label; | |
203 | ||
204 | bgc->gc.of_node = dev->of_node; | |
205 | bgc->gc.of_gpio_n_cells = 3; | |
206 | bgc->gc.of_xlate = etraxfs_gpio_of_xlate; | |
207 | ||
208 | ret = gpiochip_add(&bgc->gc); | |
209 | if (ret) | |
210 | dev_err(dev, "Unable to register port %s\n", | |
211 | bgc->gc.label); | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static struct platform_driver etraxfs_gpio_driver = { | |
218 | .driver = { | |
219 | .name = "etraxfs-gpio", | |
220 | .of_match_table = of_match_ptr(etraxfs_gpio_of_table), | |
221 | }, | |
222 | .probe = etraxfs_gpio_probe, | |
223 | }; | |
224 | ||
225 | static int __init etraxfs_gpio_init(void) | |
226 | { | |
227 | return platform_driver_register(&etraxfs_gpio_driver); | |
228 | } | |
229 | ||
230 | device_initcall(etraxfs_gpio_init); |