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1 | // SPDX-License-Identifier: (GPL-2.0 OR MIT) |
2 | /* | |
3 | * Core driver for the Ocelot chip family. | |
4 | * | |
5 | * The VSC7511, 7512, 7513, and 7514 can be controlled internally via an | |
6 | * on-chip MIPS processor, or externally via SPI, I2C, PCIe. This core driver is | |
7 | * intended to be the bus-agnostic glue between, for example, the SPI bus and | |
8 | * the child devices. | |
9 | * | |
10 | * Copyright 2021-2022 Innovative Advantage Inc. | |
11 | * | |
12 | * Author: Colin Foster <colin.foster@in-advantage.com> | |
13 | */ | |
14 | ||
15 | #include <linux/bits.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/export.h> | |
18 | #include <linux/iopoll.h> | |
19 | #include <linux/ioport.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mfd/core.h> | |
22 | #include <linux/mfd/ocelot.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/regmap.h> | |
25 | #include <linux/types.h> | |
26 | ||
27 | #include <soc/mscc/ocelot.h> | |
28 | ||
29 | #include "ocelot.h" | |
30 | ||
31 | #define REG_GCB_SOFT_RST 0x0008 | |
32 | ||
33 | #define BIT_SOFT_CHIP_RST BIT(0) | |
34 | ||
35 | #define VSC7512_MIIM0_RES_START 0x7107009c | |
36 | #define VSC7512_MIIM1_RES_START 0x710700c0 | |
37 | #define VSC7512_MIIM_RES_SIZE 0x024 | |
38 | ||
39 | #define VSC7512_PHY_RES_START 0x710700f0 | |
40 | #define VSC7512_PHY_RES_SIZE 0x004 | |
41 | ||
42 | #define VSC7512_GPIO_RES_START 0x71070034 | |
43 | #define VSC7512_GPIO_RES_SIZE 0x06c | |
44 | ||
45 | #define VSC7512_SIO_CTRL_RES_START 0x710700f8 | |
46 | #define VSC7512_SIO_CTRL_RES_SIZE 0x100 | |
47 | ||
48 | #define VSC7512_GCB_RST_SLEEP_US 100 | |
49 | #define VSC7512_GCB_RST_TIMEOUT_US 100000 | |
50 | ||
51 | static int ocelot_gcb_chip_rst_status(struct ocelot_ddata *ddata) | |
52 | { | |
53 | int val, err; | |
54 | ||
55 | err = regmap_read(ddata->gcb_regmap, REG_GCB_SOFT_RST, &val); | |
56 | if (err) | |
57 | return err; | |
58 | ||
59 | return val; | |
60 | } | |
61 | ||
62 | int ocelot_chip_reset(struct device *dev) | |
63 | { | |
64 | struct ocelot_ddata *ddata = dev_get_drvdata(dev); | |
65 | int ret, val; | |
66 | ||
67 | /* | |
68 | * Reset the entire chip here to put it into a completely known state. | |
69 | * Other drivers may want to reset their own subsystems. The register | |
70 | * self-clears, so one write is all that is needed and wait for it to | |
71 | * clear. | |
72 | */ | |
73 | ret = regmap_write(ddata->gcb_regmap, REG_GCB_SOFT_RST, BIT_SOFT_CHIP_RST); | |
74 | if (ret) | |
75 | return ret; | |
76 | ||
77 | return readx_poll_timeout(ocelot_gcb_chip_rst_status, ddata, val, !val, | |
78 | VSC7512_GCB_RST_SLEEP_US, VSC7512_GCB_RST_TIMEOUT_US); | |
79 | } | |
80 | EXPORT_SYMBOL_NS(ocelot_chip_reset, MFD_OCELOT); | |
81 | ||
82 | static const struct resource vsc7512_miim0_resources[] = { | |
83 | DEFINE_RES_REG_NAMED(VSC7512_MIIM0_RES_START, VSC7512_MIIM_RES_SIZE, "gcb_miim0"), | |
84 | DEFINE_RES_REG_NAMED(VSC7512_PHY_RES_START, VSC7512_PHY_RES_SIZE, "gcb_phy"), | |
85 | }; | |
86 | ||
87 | static const struct resource vsc7512_miim1_resources[] = { | |
88 | DEFINE_RES_REG_NAMED(VSC7512_MIIM1_RES_START, VSC7512_MIIM_RES_SIZE, "gcb_miim1"), | |
89 | }; | |
90 | ||
91 | static const struct resource vsc7512_pinctrl_resources[] = { | |
92 | DEFINE_RES_REG_NAMED(VSC7512_GPIO_RES_START, VSC7512_GPIO_RES_SIZE, "gcb_gpio"), | |
93 | }; | |
94 | ||
95 | static const struct resource vsc7512_sgpio_resources[] = { | |
96 | DEFINE_RES_REG_NAMED(VSC7512_SIO_CTRL_RES_START, VSC7512_SIO_CTRL_RES_SIZE, "gcb_sio"), | |
97 | }; | |
98 | ||
99 | static const struct mfd_cell vsc7512_devs[] = { | |
100 | { | |
101 | .name = "ocelot-pinctrl", | |
102 | .of_compatible = "mscc,ocelot-pinctrl", | |
103 | .num_resources = ARRAY_SIZE(vsc7512_pinctrl_resources), | |
104 | .resources = vsc7512_pinctrl_resources, | |
105 | }, { | |
106 | .name = "ocelot-sgpio", | |
107 | .of_compatible = "mscc,ocelot-sgpio", | |
108 | .num_resources = ARRAY_SIZE(vsc7512_sgpio_resources), | |
109 | .resources = vsc7512_sgpio_resources, | |
110 | }, { | |
111 | .name = "ocelot-miim0", | |
112 | .of_compatible = "mscc,ocelot-miim", | |
113 | .of_reg = VSC7512_MIIM0_RES_START, | |
114 | .use_of_reg = true, | |
115 | .num_resources = ARRAY_SIZE(vsc7512_miim0_resources), | |
116 | .resources = vsc7512_miim0_resources, | |
117 | }, { | |
118 | .name = "ocelot-miim1", | |
119 | .of_compatible = "mscc,ocelot-miim", | |
120 | .of_reg = VSC7512_MIIM1_RES_START, | |
121 | .use_of_reg = true, | |
122 | .num_resources = ARRAY_SIZE(vsc7512_miim1_resources), | |
123 | .resources = vsc7512_miim1_resources, | |
124 | }, | |
125 | }; | |
126 | ||
127 | static void ocelot_core_try_add_regmap(struct device *dev, | |
128 | const struct resource *res) | |
129 | { | |
130 | if (dev_get_regmap(dev, res->name)) | |
131 | return; | |
132 | ||
133 | ocelot_spi_init_regmap(dev, res); | |
134 | } | |
135 | ||
136 | static void ocelot_core_try_add_regmaps(struct device *dev, | |
137 | const struct mfd_cell *cell) | |
138 | { | |
139 | int i; | |
140 | ||
141 | for (i = 0; i < cell->num_resources; i++) | |
142 | ocelot_core_try_add_regmap(dev, &cell->resources[i]); | |
143 | } | |
144 | ||
145 | int ocelot_core_init(struct device *dev) | |
146 | { | |
147 | int i, ndevs; | |
148 | ||
149 | ndevs = ARRAY_SIZE(vsc7512_devs); | |
150 | ||
151 | for (i = 0; i < ndevs; i++) | |
152 | ocelot_core_try_add_regmaps(dev, &vsc7512_devs[i]); | |
153 | ||
154 | return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, vsc7512_devs, ndevs, NULL, 0, NULL); | |
155 | } | |
156 | EXPORT_SYMBOL_NS(ocelot_core_init, MFD_OCELOT); | |
157 | ||
158 | MODULE_DESCRIPTION("Externally Controlled Ocelot Chip Driver"); | |
159 | MODULE_AUTHOR("Colin Foster <colin.foster@in-advantage.com>"); | |
160 | MODULE_LICENSE("GPL"); | |
161 | MODULE_IMPORT_NS(MFD_OCELOT_SPI); |