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134d9c52 MR |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Copyright (C) 2022 Schneider-Electric | |
4 | * Author: Miquel Raynal <miquel.raynal@bootlin.com | |
5 | * Based on TI crossbar driver written by Peter Ujfalusi <peter.ujfalusi@ti.com> | |
6 | */ | |
7 | #include <linux/bitops.h> | |
897500c7 | 8 | #include <linux/of.h> |
134d9c52 | 9 | #include <linux/of_dma.h> |
897500c7 RH |
10 | #include <linux/of_platform.h> |
11 | #include <linux/platform_device.h> | |
134d9c52 MR |
12 | #include <linux/slab.h> |
13 | #include <linux/soc/renesas/r9a06g032-sysctrl.h> | |
14 | #include <linux/types.h> | |
15 | ||
16 | #define RNZ1_DMAMUX_NCELLS 6 | |
17 | #define RZN1_DMAMUX_MAX_LINES 64 | |
18 | #define RZN1_DMAMUX_LINES_PER_CTLR 16 | |
19 | ||
20 | struct rzn1_dmamux_data { | |
21 | struct dma_router dmarouter; | |
22 | DECLARE_BITMAP(used_chans, 2 * RZN1_DMAMUX_LINES_PER_CTLR); | |
23 | }; | |
24 | ||
25 | struct rzn1_dmamux_map { | |
26 | unsigned int req_idx; | |
27 | }; | |
28 | ||
29 | static void rzn1_dmamux_free(struct device *dev, void *route_data) | |
30 | { | |
31 | struct rzn1_dmamux_data *dmamux = dev_get_drvdata(dev); | |
32 | struct rzn1_dmamux_map *map = route_data; | |
33 | ||
34 | dev_dbg(dev, "Unmapping DMAMUX request %u\n", map->req_idx); | |
35 | ||
36 | clear_bit(map->req_idx, dmamux->used_chans); | |
37 | ||
38 | kfree(map); | |
39 | } | |
40 | ||
41 | static void *rzn1_dmamux_route_allocate(struct of_phandle_args *dma_spec, | |
42 | struct of_dma *ofdma) | |
43 | { | |
44 | struct platform_device *pdev = of_find_device_by_node(ofdma->of_node); | |
45 | struct rzn1_dmamux_data *dmamux = platform_get_drvdata(pdev); | |
46 | struct rzn1_dmamux_map *map; | |
47 | unsigned int dmac_idx, chan, val; | |
48 | u32 mask; | |
49 | int ret; | |
50 | ||
51 | if (dma_spec->args_count != RNZ1_DMAMUX_NCELLS) | |
52 | return ERR_PTR(-EINVAL); | |
53 | ||
54 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
55 | if (!map) | |
56 | return ERR_PTR(-ENOMEM); | |
57 | ||
58 | chan = dma_spec->args[0]; | |
59 | map->req_idx = dma_spec->args[4]; | |
60 | val = dma_spec->args[5]; | |
61 | dma_spec->args_count -= 2; | |
62 | ||
63 | if (chan >= RZN1_DMAMUX_LINES_PER_CTLR) { | |
64 | dev_err(&pdev->dev, "Invalid DMA request line: %u\n", chan); | |
65 | ret = -EINVAL; | |
66 | goto free_map; | |
67 | } | |
68 | ||
69 | if (map->req_idx >= RZN1_DMAMUX_MAX_LINES || | |
70 | (map->req_idx % RZN1_DMAMUX_LINES_PER_CTLR) != chan) { | |
71 | dev_err(&pdev->dev, "Invalid MUX request line: %u\n", map->req_idx); | |
72 | ret = -EINVAL; | |
73 | goto free_map; | |
74 | } | |
75 | ||
76 | dmac_idx = map->req_idx >= RZN1_DMAMUX_LINES_PER_CTLR ? 1 : 0; | |
77 | dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", dmac_idx); | |
78 | if (!dma_spec->np) { | |
79 | dev_err(&pdev->dev, "Can't get DMA master\n"); | |
80 | ret = -EINVAL; | |
81 | goto free_map; | |
82 | } | |
83 | ||
84 | dev_dbg(&pdev->dev, "Mapping DMAMUX request %u to DMAC%u request %u\n", | |
85 | map->req_idx, dmac_idx, chan); | |
86 | ||
87 | if (test_and_set_bit(map->req_idx, dmamux->used_chans)) { | |
88 | ret = -EBUSY; | |
89 | goto free_map; | |
90 | } | |
91 | ||
92 | mask = BIT(map->req_idx); | |
93 | ret = r9a06g032_sysctrl_set_dmamux(mask, val ? mask : 0); | |
94 | if (ret) | |
95 | goto clear_bitmap; | |
96 | ||
97 | return map; | |
98 | ||
99 | clear_bitmap: | |
100 | clear_bit(map->req_idx, dmamux->used_chans); | |
101 | free_map: | |
102 | kfree(map); | |
103 | ||
104 | return ERR_PTR(ret); | |
105 | } | |
106 | ||
7811f2e7 | 107 | #ifdef CONFIG_OF |
134d9c52 MR |
108 | static const struct of_device_id rzn1_dmac_match[] = { |
109 | { .compatible = "renesas,rzn1-dma" }, | |
110 | {} | |
111 | }; | |
7811f2e7 | 112 | #endif |
134d9c52 MR |
113 | |
114 | static int rzn1_dmamux_probe(struct platform_device *pdev) | |
115 | { | |
116 | struct device_node *mux_node = pdev->dev.of_node; | |
117 | const struct of_device_id *match; | |
118 | struct device_node *dmac_node; | |
119 | struct rzn1_dmamux_data *dmamux; | |
120 | ||
121 | dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL); | |
122 | if (!dmamux) | |
123 | return -ENOMEM; | |
124 | ||
125 | dmac_node = of_parse_phandle(mux_node, "dma-masters", 0); | |
126 | if (!dmac_node) | |
127 | return dev_err_probe(&pdev->dev, -ENODEV, "Can't get DMA master node\n"); | |
128 | ||
129 | match = of_match_node(rzn1_dmac_match, dmac_node); | |
130 | of_node_put(dmac_node); | |
131 | if (!match) | |
132 | return dev_err_probe(&pdev->dev, -EINVAL, "DMA master is not supported\n"); | |
133 | ||
134 | dmamux->dmarouter.dev = &pdev->dev; | |
135 | dmamux->dmarouter.route_free = rzn1_dmamux_free; | |
136 | ||
137 | platform_set_drvdata(pdev, dmamux); | |
138 | ||
139 | return of_dma_router_register(mux_node, rzn1_dmamux_route_allocate, | |
140 | &dmamux->dmarouter); | |
141 | } | |
142 | ||
143 | static const struct of_device_id rzn1_dmamux_match[] = { | |
144 | { .compatible = "renesas,rzn1-dmamux" }, | |
145 | {} | |
146 | }; | |
2717d338 | 147 | MODULE_DEVICE_TABLE(of, rzn1_dmamux_match); |
134d9c52 MR |
148 | |
149 | static struct platform_driver rzn1_dmamux_driver = { | |
150 | .driver = { | |
151 | .name = "renesas,rzn1-dmamux", | |
152 | .of_match_table = rzn1_dmamux_match, | |
153 | }, | |
154 | .probe = rzn1_dmamux_probe, | |
155 | }; | |
156 | module_platform_driver(rzn1_dmamux_driver); | |
157 | ||
158 | MODULE_LICENSE("GPL"); | |
159 | MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com"); | |
160 | MODULE_DESCRIPTION("Renesas RZ/N1 DMAMUX driver"); |