Commit | Line | Data |
---|---|---|
9ed68fa7 BG |
1 | /* |
2 | * Copyright (C) STMicroelectronics SA 2014 | |
3 | * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics. | |
4 | * License terms: GNU General Public License (GPL), version 2 | |
5 | */ | |
6 | ||
7 | #include <linux/clk.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/of.h> | |
11 | #include <linux/platform_device.h> | |
12 | ||
13 | #include <drm/drmP.h> | |
14 | ||
15 | /* registers offset */ | |
16 | #define VTAC_CONFIG 0x00 | |
17 | #define VTAC_RX_FIFO_CONFIG 0x04 | |
18 | #define VTAC_FIFO_CONFIG_VAL 0x04 | |
19 | ||
20 | #define VTAC_SYS_CFG8521 0x824 | |
21 | #define VTAC_SYS_CFG8522 0x828 | |
22 | ||
23 | /* Number of phyts per pixel */ | |
24 | #define VTAC_2_5_PPP 0x0005 | |
25 | #define VTAC_3_PPP 0x0006 | |
26 | #define VTAC_4_PPP 0x0008 | |
27 | #define VTAC_5_PPP 0x000A | |
28 | #define VTAC_6_PPP 0x000C | |
29 | #define VTAC_13_PPP 0x001A | |
30 | #define VTAC_14_PPP 0x001C | |
31 | #define VTAC_15_PPP 0x001E | |
32 | #define VTAC_16_PPP 0x0020 | |
33 | #define VTAC_17_PPP 0x0022 | |
34 | #define VTAC_18_PPP 0x0024 | |
35 | ||
36 | /* enable bits */ | |
37 | #define VTAC_ENABLE 0x3003 | |
38 | ||
39 | #define VTAC_TX_PHY_ENABLE_CLK_PHY BIT(0) | |
40 | #define VTAC_TX_PHY_ENABLE_CLK_DLL BIT(1) | |
41 | #define VTAC_TX_PHY_PLL_NOT_OSC_MODE BIT(3) | |
42 | #define VTAC_TX_PHY_RST_N_DLL_SWITCH BIT(4) | |
43 | #define VTAC_TX_PHY_PROG_N3 BIT(9) | |
44 | ||
45 | ||
46 | /** | |
47 | * VTAC mode structure | |
48 | * | |
49 | * @vid_in_width: Video Data Resolution | |
50 | * @phyts_width: Width of phyt buses(phyt low and phyt high). | |
51 | * @phyts_per_pixel: Number of phyts sent per pixel | |
52 | */ | |
53 | struct sti_vtac_mode { | |
54 | u32 vid_in_width; | |
55 | u32 phyts_width; | |
56 | u32 phyts_per_pixel; | |
57 | }; | |
58 | ||
59 | static const struct sti_vtac_mode vtac_mode_main = {0x2, 0x2, VTAC_5_PPP}; | |
60 | static const struct sti_vtac_mode vtac_mode_aux = {0x1, 0x0, VTAC_17_PPP}; | |
61 | ||
62 | /** | |
63 | * VTAC structure | |
64 | * | |
65 | * @dev: pointer to device structure | |
66 | * @regs: ioremapped registers for RX and TX devices | |
67 | * @phy_regs: phy registers for TX device | |
68 | * @clk: clock | |
69 | * @mode: main or auxillary configuration mode | |
70 | */ | |
71 | struct sti_vtac { | |
72 | struct device *dev; | |
73 | void __iomem *regs; | |
74 | void __iomem *phy_regs; | |
75 | struct clk *clk; | |
76 | const struct sti_vtac_mode *mode; | |
77 | }; | |
78 | ||
79 | static void sti_vtac_rx_set_config(struct sti_vtac *vtac) | |
80 | { | |
81 | u32 config; | |
82 | ||
83 | /* Enable VTAC clock */ | |
84 | if (clk_prepare_enable(vtac->clk)) | |
85 | DRM_ERROR("Failed to prepare/enable vtac_rx clock.\n"); | |
86 | ||
87 | writel(VTAC_FIFO_CONFIG_VAL, vtac->regs + VTAC_RX_FIFO_CONFIG); | |
88 | ||
89 | config = VTAC_ENABLE; | |
90 | config |= vtac->mode->vid_in_width << 4; | |
91 | config |= vtac->mode->phyts_width << 16; | |
92 | config |= vtac->mode->phyts_per_pixel << 23; | |
93 | writel(config, vtac->regs + VTAC_CONFIG); | |
94 | } | |
95 | ||
96 | static void sti_vtac_tx_set_config(struct sti_vtac *vtac) | |
97 | { | |
98 | u32 phy_config; | |
99 | u32 config; | |
100 | ||
101 | /* Enable VTAC clock */ | |
102 | if (clk_prepare_enable(vtac->clk)) | |
103 | DRM_ERROR("Failed to prepare/enable vtac_tx clock.\n"); | |
104 | ||
105 | /* Configure vtac phy */ | |
106 | phy_config = 0x00000000; | |
107 | writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8522); | |
108 | phy_config = VTAC_TX_PHY_ENABLE_CLK_PHY; | |
109 | writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521); | |
110 | phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521); | |
111 | phy_config |= VTAC_TX_PHY_PROG_N3; | |
112 | writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521); | |
113 | phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521); | |
114 | phy_config |= VTAC_TX_PHY_ENABLE_CLK_DLL; | |
115 | writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521); | |
116 | phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521); | |
117 | phy_config |= VTAC_TX_PHY_RST_N_DLL_SWITCH; | |
118 | writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521); | |
119 | phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521); | |
120 | phy_config |= VTAC_TX_PHY_PLL_NOT_OSC_MODE; | |
121 | writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521); | |
122 | ||
123 | /* Configure vtac tx */ | |
124 | config = VTAC_ENABLE; | |
125 | config |= vtac->mode->vid_in_width << 4; | |
126 | config |= vtac->mode->phyts_width << 16; | |
127 | config |= vtac->mode->phyts_per_pixel << 23; | |
128 | writel(config, vtac->regs + VTAC_CONFIG); | |
129 | } | |
130 | ||
131 | static const struct of_device_id vtac_of_match[] = { | |
132 | { | |
133 | .compatible = "st,vtac-main", | |
134 | .data = &vtac_mode_main, | |
135 | }, { | |
136 | .compatible = "st,vtac-aux", | |
137 | .data = &vtac_mode_aux, | |
138 | }, { | |
139 | /* end node */ | |
140 | } | |
141 | }; | |
142 | MODULE_DEVICE_TABLE(of, vtac_of_match); | |
143 | ||
144 | static int sti_vtac_probe(struct platform_device *pdev) | |
145 | { | |
146 | struct device *dev = &pdev->dev; | |
147 | struct device_node *np = dev->of_node; | |
148 | const struct of_device_id *id; | |
149 | struct sti_vtac *vtac; | |
150 | struct resource *res; | |
151 | ||
152 | vtac = devm_kzalloc(dev, sizeof(*vtac), GFP_KERNEL); | |
153 | if (!vtac) | |
154 | return -ENOMEM; | |
155 | ||
156 | vtac->dev = dev; | |
157 | ||
158 | id = of_match_node(vtac_of_match, np); | |
159 | if (!id) | |
160 | return -ENOMEM; | |
161 | ||
162 | vtac->mode = id->data; | |
163 | ||
164 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
165 | if (!res) { | |
166 | DRM_ERROR("Invalid resource\n"); | |
167 | return -ENOMEM; | |
168 | } | |
169 | vtac->regs = devm_ioremap_resource(dev, res); | |
170 | if (IS_ERR(vtac->regs)) | |
171 | return PTR_ERR(vtac->regs); | |
172 | ||
173 | ||
174 | vtac->clk = devm_clk_get(dev, "vtac"); | |
175 | if (IS_ERR(vtac->clk)) { | |
176 | DRM_ERROR("Cannot get vtac clock\n"); | |
177 | return PTR_ERR(vtac->clk); | |
178 | } | |
179 | ||
180 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
181 | if (res) { | |
182 | vtac->phy_regs = devm_ioremap_nocache(dev, res->start, | |
183 | resource_size(res)); | |
184 | sti_vtac_tx_set_config(vtac); | |
185 | } else { | |
186 | ||
187 | sti_vtac_rx_set_config(vtac); | |
188 | } | |
189 | ||
190 | platform_set_drvdata(pdev, vtac); | |
191 | DRM_INFO("%s %s\n", __func__, dev_name(vtac->dev)); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int sti_vtac_remove(struct platform_device *pdev) | |
197 | { | |
198 | return 0; | |
199 | } | |
200 | ||
201 | struct platform_driver sti_vtac_driver = { | |
202 | .driver = { | |
203 | .name = "sti-vtac", | |
204 | .owner = THIS_MODULE, | |
205 | .of_match_table = vtac_of_match, | |
206 | }, | |
207 | .probe = sti_vtac_probe, | |
208 | .remove = sti_vtac_remove, | |
209 | }; | |
210 | ||
211 | module_platform_driver(sti_vtac_driver); | |
212 | ||
213 | MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); | |
214 | MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); | |
215 | MODULE_LICENSE("GPL"); |