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
9 #include <linux/module.h>
11 #include <linux/platform_device.h>
15 /* registers offset */
16 #define VTAC_CONFIG 0x00
17 #define VTAC_RX_FIFO_CONFIG 0x04
18 #define VTAC_FIFO_CONFIG_VAL 0x04
20 #define VTAC_SYS_CFG8521 0x824
21 #define VTAC_SYS_CFG8522 0x828
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
37 #define VTAC_ENABLE 0x3003
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)
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
53 struct sti_vtac_mode
{
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
};
65 * @dev: pointer to device structure
66 * @regs: ioremapped registers for RX and TX devices
67 * @phy_regs: phy registers for TX device
69 * @mode: main or auxillary configuration mode
74 void __iomem
*phy_regs
;
76 const struct sti_vtac_mode
*mode
;
79 static void sti_vtac_rx_set_config(struct sti_vtac
*vtac
)
83 /* Enable VTAC clock */
84 if (clk_prepare_enable(vtac
->clk
))
85 DRM_ERROR("Failed to prepare/enable vtac_rx clock.\n");
87 writel(VTAC_FIFO_CONFIG_VAL
, vtac
->regs
+ VTAC_RX_FIFO_CONFIG
);
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
);
96 static void sti_vtac_tx_set_config(struct sti_vtac
*vtac
)
101 /* Enable VTAC clock */
102 if (clk_prepare_enable(vtac
->clk
))
103 DRM_ERROR("Failed to prepare/enable vtac_tx clock.\n");
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
);
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
);
131 static const struct of_device_id vtac_of_match
[] = {
133 .compatible
= "st,vtac-main",
134 .data
= &vtac_mode_main
,
136 .compatible
= "st,vtac-aux",
137 .data
= &vtac_mode_aux
,
142 MODULE_DEVICE_TABLE(of
, vtac_of_match
);
144 static int sti_vtac_probe(struct platform_device
*pdev
)
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
;
152 vtac
= devm_kzalloc(dev
, sizeof(*vtac
), GFP_KERNEL
);
158 id
= of_match_node(vtac_of_match
, np
);
162 vtac
->mode
= id
->data
;
164 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
166 DRM_ERROR("Invalid resource\n");
169 vtac
->regs
= devm_ioremap_resource(dev
, res
);
170 if (IS_ERR(vtac
->regs
))
171 return PTR_ERR(vtac
->regs
);
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
);
180 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 1);
182 vtac
->phy_regs
= devm_ioremap_nocache(dev
, res
->start
,
184 sti_vtac_tx_set_config(vtac
);
187 sti_vtac_rx_set_config(vtac
);
190 platform_set_drvdata(pdev
, vtac
);
191 DRM_INFO("%s %s\n", __func__
, dev_name(vtac
->dev
));
196 static int sti_vtac_remove(struct platform_device
*pdev
)
201 struct platform_driver sti_vtac_driver
= {
204 .owner
= THIS_MODULE
,
205 .of_match_table
= vtac_of_match
,
207 .probe
= sti_vtac_probe
,
208 .remove
= sti_vtac_remove
,
211 module_platform_driver(sti_vtac_driver
);
213 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
214 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
215 MODULE_LICENSE("GPL");