[deliverable/linux.git] / drivers / gpu / drm / sti / sti_vtac.c

/*
 * Copyright (C) STMicroelectronics SA 2014
 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>

#include <drm/drmP.h>

/* registers offset */
#define VTAC_CONFIG                     0x00
#define VTAC_RX_FIFO_CONFIG             0x04
#define VTAC_FIFO_CONFIG_VAL            0x04

#define VTAC_SYS_CFG8521                0x824
#define VTAC_SYS_CFG8522                0x828

/* Number of phyts per pixel */
#define VTAC_2_5_PPP                    0x0005
#define VTAC_3_PPP                      0x0006
#define VTAC_4_PPP                      0x0008
#define VTAC_5_PPP                      0x000A
#define VTAC_6_PPP                      0x000C
#define VTAC_13_PPP                     0x001A
#define VTAC_14_PPP                     0x001C
#define VTAC_15_PPP                     0x001E
#define VTAC_16_PPP                     0x0020
#define VTAC_17_PPP                     0x0022
#define VTAC_18_PPP                     0x0024

/* enable bits */
#define VTAC_ENABLE                     0x3003

#define VTAC_TX_PHY_ENABLE_CLK_PHY      BIT(0)
#define VTAC_TX_PHY_ENABLE_CLK_DLL      BIT(1)
#define VTAC_TX_PHY_PLL_NOT_OSC_MODE    BIT(3)
#define VTAC_TX_PHY_RST_N_DLL_SWITCH    BIT(4)
#define VTAC_TX_PHY_PROG_N3             BIT(9)


/**
 * VTAC mode structure
 *
 * @vid_in_width: Video Data Resolution
 * @phyts_width: Width of phyt buses(phyt low and phyt high).
 * @phyts_per_pixel: Number of phyts sent per pixel
 */
struct sti_vtac_mode {
	u32 vid_in_width;
	u32 phyts_width;
	u32 phyts_per_pixel;
};

static const struct sti_vtac_mode vtac_mode_main = {0x2, 0x2, VTAC_5_PPP};
static const struct sti_vtac_mode vtac_mode_aux = {0x1, 0x0, VTAC_17_PPP};

/**
 * VTAC structure
 *
 * @dev: pointer to device structure
 * @regs: ioremapped registers for RX and TX devices
 * @phy_regs: phy registers for TX device
 * @clk: clock
 * @mode: main or auxillary configuration mode
 */
struct sti_vtac {
	struct device *dev;
	void __iomem *regs;
	void __iomem *phy_regs;
	struct clk *clk;
	const struct sti_vtac_mode *mode;
};

static void sti_vtac_rx_set_config(struct sti_vtac *vtac)
{
	u32 config;

	/* Enable VTAC clock */
	if (clk_prepare_enable(vtac->clk))
		DRM_ERROR("Failed to prepare/enable vtac_rx clock.\n");

	writel(VTAC_FIFO_CONFIG_VAL, vtac->regs + VTAC_RX_FIFO_CONFIG);

	config = VTAC_ENABLE;
	config |= vtac->mode->vid_in_width << 4;
	config |= vtac->mode->phyts_width << 16;
	config |= vtac->mode->phyts_per_pixel << 23;
	writel(config, vtac->regs + VTAC_CONFIG);
}

static void sti_vtac_tx_set_config(struct sti_vtac *vtac)
{
	u32 phy_config;
	u32 config;

	/* Enable VTAC clock */
	if (clk_prepare_enable(vtac->clk))
		DRM_ERROR("Failed to prepare/enable vtac_tx clock.\n");

	/* Configure vtac phy */
	phy_config = 0x00000000;
	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8522);
	phy_config = VTAC_TX_PHY_ENABLE_CLK_PHY;
	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config |= VTAC_TX_PHY_PROG_N3;
	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config |= VTAC_TX_PHY_ENABLE_CLK_DLL;
	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config |= VTAC_TX_PHY_RST_N_DLL_SWITCH;
	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
	phy_config |= VTAC_TX_PHY_PLL_NOT_OSC_MODE;
	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);

	/* Configure vtac tx */
	config = VTAC_ENABLE;
	config |= vtac->mode->vid_in_width << 4;
	config |= vtac->mode->phyts_width << 16;
	config |= vtac->mode->phyts_per_pixel << 23;
	writel(config, vtac->regs + VTAC_CONFIG);
}

static const struct of_device_id vtac_of_match[] = {
	{
		.compatible = "st,vtac-main",
		.data = &vtac_mode_main,
	}, {
		.compatible = "st,vtac-aux",
		.data = &vtac_mode_aux,
	}, {
		/* end node */
	}
};
MODULE_DEVICE_TABLE(of, vtac_of_match);

static int sti_vtac_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	const struct of_device_id *id;
	struct sti_vtac *vtac;
	struct resource *res;

	vtac = devm_kzalloc(dev, sizeof(*vtac), GFP_KERNEL);
	if (!vtac)
		return -ENOMEM;

	vtac->dev = dev;

	id = of_match_node(vtac_of_match, np);
	if (!id)
		return -ENOMEM;

	vtac->mode = id->data;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		DRM_ERROR("Invalid resource\n");
		return -ENOMEM;
	}
	vtac->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(vtac->regs))
		return PTR_ERR(vtac->regs);


	vtac->clk = devm_clk_get(dev, "vtac");
	if (IS_ERR(vtac->clk)) {
		DRM_ERROR("Cannot get vtac clock\n");
		return PTR_ERR(vtac->clk);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (res) {
		vtac->phy_regs = devm_ioremap_nocache(dev, res->start,
						 resource_size(res));
		sti_vtac_tx_set_config(vtac);
	} else {

		sti_vtac_rx_set_config(vtac);
	}

	platform_set_drvdata(pdev, vtac);
	DRM_INFO("%s %s\n", __func__, dev_name(vtac->dev));

	return 0;
}

static int sti_vtac_remove(struct platform_device *pdev)
{
	return 0;
}

struct platform_driver sti_vtac_driver = {
	.driver = {
		.name = "sti-vtac",
		.owner = THIS_MODULE,
		.of_match_table = vtac_of_match,
	},
	.probe = sti_vtac_probe,
	.remove = sti_vtac_remove,
};

module_platform_driver(sti_vtac_driver);

MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
MODULE_LICENSE("GPL");
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");