1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 /*
3  * Microsemi Ocelot Switch driver
4  *
5  * Copyright (c) 2017 Microsemi Corporation
6  */
7 #include <linux/io.h>
8 #include <linux/kernel.h>
9 #include <linux/platform_device.h>
10 
11 #include "ocelot.h"
12 
13 u32 __ocelot_read_ix(struct ocelot *ocelot, u32 reg, u32 offset)
14 {
15 	u16 target = reg >> TARGET_OFFSET;
16 	u32 val;
17 
18 	WARN_ON(!target);
19 
20 	regmap_read(ocelot->targets[target],
21 		    ocelot->map[target][reg & REG_MASK] + offset, &val);
22 	return val;
23 }
24 EXPORT_SYMBOL(__ocelot_read_ix);
25 
26 void __ocelot_write_ix(struct ocelot *ocelot, u32 val, u32 reg, u32 offset)
27 {
28 	u16 target = reg >> TARGET_OFFSET;
29 
30 	WARN_ON(!target);
31 
32 	regmap_write(ocelot->targets[target],
33 		     ocelot->map[target][reg & REG_MASK] + offset, val);
34 }
35 EXPORT_SYMBOL(__ocelot_write_ix);
36 
37 void __ocelot_rmw_ix(struct ocelot *ocelot, u32 val, u32 mask, u32 reg,
38 		     u32 offset)
39 {
40 	u16 target = reg >> TARGET_OFFSET;
41 
42 	WARN_ON(!target);
43 
44 	regmap_update_bits(ocelot->targets[target],
45 			   ocelot->map[target][reg & REG_MASK] + offset,
46 			   mask, val);
47 }
48 EXPORT_SYMBOL(__ocelot_rmw_ix);
49 
50 u32 ocelot_port_readl(struct ocelot_port *port, u32 reg)
51 {
52 	return readl(port->regs + reg);
53 }
54 EXPORT_SYMBOL(ocelot_port_readl);
55 
56 void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg)
57 {
58 	writel(val, port->regs + reg);
59 }
60 EXPORT_SYMBOL(ocelot_port_writel);
61 
62 int ocelot_regfields_init(struct ocelot *ocelot,
63 			  const struct reg_field *const regfields)
64 {
65 	unsigned int i;
66 	u16 target;
67 
68 	for (i = 0; i < REGFIELD_MAX; i++) {
69 		struct reg_field regfield = {};
70 		u32 reg = regfields[i].reg;
71 
72 		if (!reg)
73 			continue;
74 
75 		target = regfields[i].reg >> TARGET_OFFSET;
76 
77 		regfield.reg = ocelot->map[target][reg & REG_MASK];
78 		regfield.lsb = regfields[i].lsb;
79 		regfield.msb = regfields[i].msb;
80 
81 		ocelot->regfields[i] =
82 		devm_regmap_field_alloc(ocelot->dev,
83 					ocelot->targets[target],
84 					regfield);
85 
86 		if (IS_ERR(ocelot->regfields[i]))
87 			return PTR_ERR(ocelot->regfields[i]);
88 	}
89 
90 	return 0;
91 }
92 EXPORT_SYMBOL(ocelot_regfields_init);
93 
94 static struct regmap_config ocelot_regmap_config = {
95 	.reg_bits	= 32,
96 	.val_bits	= 32,
97 	.reg_stride	= 4,
98 };
99 
100 struct regmap *ocelot_regmap_init(struct ocelot *ocelot, struct resource *res)
101 {
102 	void __iomem *regs;
103 
104 	regs = devm_ioremap_resource(ocelot->dev, res);
105 	if (IS_ERR(regs))
106 		return ERR_CAST(regs);
107 
108 	ocelot_regmap_config.name = res->name;
109 
110 	return devm_regmap_init_mmio(ocelot->dev, regs, &ocelot_regmap_config);
111 }
112 EXPORT_SYMBOL(ocelot_regmap_init);
113