[deliverable/linux.git] / drivers / gpu / drm / radeon / radeon_i2c.c

/*
 * Copyright 2007-8 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 */
#include "drmP.h"
#include "radeon_drm.h"
#include "radeon.h"

/**
 * radeon_ddc_probe
 *
 */
bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
{
	u8 out_buf[] = { 0x0, 0x0};
	u8 buf[2];
	int ret;
	struct i2c_msg msgs[] = {
		{
			.addr = 0x50,
			.flags = 0,
			.len = 1,
			.buf = out_buf,
		},
		{
			.addr = 0x50,
			.flags = I2C_M_RD,
			.len = 1,
			.buf = buf,
		}
	};

	ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
	if (ret == 2)
		return true;

	return false;
}


void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
{
	struct radeon_device *rdev = i2c->dev->dev_private;
	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	uint32_t temp;

	/* RV410 appears to have a bug where the hw i2c in reset
	 * holds the i2c port in a bad state - switch hw i2c away before
	 * doing DDC - do this for all r200s/r300s/r400s for safety sake
	 */
	if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
		if (rec->a_clk_reg == RADEON_GPIO_MONID) {
			WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
						R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
		} else {
			WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
						R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
		}
	}

	/* clear the output pin values */
	temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
	WREG32(rec->a_clk_reg, temp);

	temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
	WREG32(rec->a_data_reg, temp);


	/* mask the gpio pins for software use */
	temp = RREG32(rec->mask_clk_reg);
	if (lock_state)
		temp |= rec->mask_clk_mask;
	else
		temp &= ~rec->mask_clk_mask;
	WREG32(rec->mask_clk_reg, temp);
	temp = RREG32(rec->mask_clk_reg);

	temp = RREG32(rec->mask_data_reg);
	if (lock_state)
		temp |= rec->mask_data_mask;
	else
		temp &= ~rec->mask_data_mask;
	WREG32(rec->mask_data_reg, temp);
	temp = RREG32(rec->mask_data_reg);
}

static int get_clock(void *i2c_priv)
{
	struct radeon_i2c_chan *i2c = i2c_priv;
	struct radeon_device *rdev = i2c->dev->dev_private;
	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	uint32_t val;

	/* read the value off the pin */
	val = RREG32(rec->y_clk_reg);
	val &= rec->y_clk_mask;

	return (val != 0);
}


static int get_data(void *i2c_priv)
{
	struct radeon_i2c_chan *i2c = i2c_priv;
	struct radeon_device *rdev = i2c->dev->dev_private;
	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	uint32_t val;

	/* read the value off the pin */
	val = RREG32(rec->y_data_reg);
	val &= rec->y_data_mask;

	return (val != 0);
}

static void set_clock(void *i2c_priv, int clock)
{
	struct radeon_i2c_chan *i2c = i2c_priv;
	struct radeon_device *rdev = i2c->dev->dev_private;
	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	uint32_t val;

	/* set pin direction */
	val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
	val |= clock ? 0 : rec->en_clk_mask;
	WREG32(rec->en_clk_reg, val);
}

static void set_data(void *i2c_priv, int data)
{
	struct radeon_i2c_chan *i2c = i2c_priv;
	struct radeon_device *rdev = i2c->dev->dev_private;
	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	uint32_t val;

	/* set pin direction */
	val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
	val |= data ? 0 : rec->en_data_mask;
	WREG32(rec->en_data_reg, val);
}

struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
					  struct radeon_i2c_bus_rec *rec,
					  const char *name)
{
	struct radeon_i2c_chan *i2c;
	int ret;

	i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
	if (i2c == NULL)
		return NULL;

	i2c->adapter.owner = THIS_MODULE;
	i2c->dev = dev;
	i2c_set_adapdata(&i2c->adapter, i2c);
	i2c->adapter.algo_data = &i2c->algo.bit;
	i2c->algo.bit.setsda = set_data;
	i2c->algo.bit.setscl = set_clock;
	i2c->algo.bit.getsda = get_data;
	i2c->algo.bit.getscl = get_clock;
	i2c->algo.bit.udelay = 20;
	/* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
	 * make this, 2 jiffies is a lot more reliable */
	i2c->algo.bit.timeout = 2;
	i2c->algo.bit.data = i2c;
	i2c->rec = *rec;
	ret = i2c_bit_add_bus(&i2c->adapter);
	if (ret) {
		DRM_INFO("Failed to register i2c %s\n", name);
		goto out_free;
	}

	return i2c;
out_free:
	kfree(i2c);
	return NULL;

}

struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
					     const char *name, bool dp, u8 i2c_id)
{
	struct radeon_i2c_chan *i2c;
	int ret;

	i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
	if (i2c == NULL)
		return NULL;

	i2c->i2c_id = i2c_id;
	i2c->adapter.owner = THIS_MODULE;
	i2c->dev = dev;
	i2c_set_adapdata(&i2c->adapter, i2c);
	i2c->adapter.algo_data = &i2c->algo.dp;
	i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
	i2c->algo.dp.address = 0;
	ret = i2c_dp_aux_add_bus(&i2c->adapter);
	if (ret) {
		DRM_INFO("Failed to register i2c %s\n", name);
		goto out_free;
	}

	return i2c;
out_free:
	kfree(i2c);
	return NULL;

}


void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
{
	if (!i2c)
		return;

	i2c_del_adapter(&i2c->adapter);
	kfree(i2c);
}

struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
{
	return NULL;
}

void radeon_i2c_sw_get_byte(struct radeon_i2c_chan *i2c_bus,
			    u8 slave_addr,
			    u8 addr,
			    u8 *val)
{
	u8 out_buf[2];
	u8 in_buf[2];
	struct i2c_msg msgs[] = {
		{
			.addr = slave_addr,
			.flags = 0,
			.len = 1,
			.buf = out_buf,
		},
		{
			.addr = slave_addr,
			.flags = I2C_M_RD,
			.len = 1,
			.buf = in_buf,
		}
	};

	out_buf[0] = addr;
	out_buf[1] = 0;

	if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
		*val = in_buf[0];
		DRM_DEBUG("val = 0x%02x\n", *val);
	} else {
		DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",
			  addr, *val);
	}
}

void radeon_i2c_sw_put_byte(struct radeon_i2c_chan *i2c_bus,
			    u8 slave_addr,
			    u8 addr,
			    u8 val)
{
	uint8_t out_buf[2];
	struct i2c_msg msg = {
		.addr = slave_addr,
		.flags = 0,
		.len = 2,
		.buf = out_buf,
	};

	out_buf[0] = addr;
	out_buf[1] = val;

	if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
		DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",
			  addr, val);
}
Commit	Line	Data
771fe6b9 JG	1	/*
	2	* Copyright 2007-8 Advanced Micro Devices, Inc.
	3	* Copyright 2008 Red Hat Inc.
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the "Software"),
	7	* to deal in the Software without restriction, including without limitation
	8	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	9	* and/or sell copies of the Software, and to permit persons to whom the
	10	* Software is furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice shall be included in
	13	* all copies or substantial portions of the Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	18	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	19	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	20	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	21	* OTHER DEALINGS IN THE SOFTWARE.
	22	*
	23	* Authors: Dave Airlie
	24	* Alex Deucher
	25	*/
	26	#include "drmP.h"
	27	#include "radeon_drm.h"
	28	#include "radeon.h"
	29
	30	/**
	31	* radeon_ddc_probe
	32	*
	33	*/
	34	bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
	35	{
	36	u8 out_buf[] = { 0x0, 0x0};
	37	u8 buf[2];
	38	int ret;
	39	struct i2c_msg msgs[] = {
	40	{
	41	.addr = 0x50,
	42	.flags = 0,
	43	.len = 1,
	44	.buf = out_buf,
	45	},
	46	{
	47	.addr = 0x50,
	48	.flags = I2C_M_RD,
	49	.len = 1,
	50	.buf = buf,
	51	}
	52	};
	53
	54	ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
	55	if (ret == 2)
	56	return true;
	57
	58	return false;
	59	}
	60
	61
ab1e9ea0	62	void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
771fe6b9	63	{
ab1e9ea0 AD	64	struct radeon_device *rdev = i2c->dev->dev_private;
ab1e9ea0 AD	65	struct radeon_i2c_bus_rec *rec = &i2c->rec;
771fe6b9	66	uint32_t temp;
771fe6b9 JG	67
	68	/* RV410 appears to have a bug where the hw i2c in reset
	69	* holds the i2c port in a bad state - switch hw i2c away before
	70	* doing DDC - do this for all r200s/r300s/r400s for safety sake
	71	*/
	72	if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
	73	if (rec->a_clk_reg == RADEON_GPIO_MONID) {
	74	WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST \|
	75	R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
	76	} else {
	77	WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST \|
	78	R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
	79	}
	80	}
771fe6b9	81
9b9fe724 AD	82	/* clear the output pin values */
	83	temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
	84	WREG32(rec->a_clk_reg, temp);
	85
	86	temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
	87	WREG32(rec->a_data_reg, temp);
	88
	89
	90	/* mask the gpio pins for software use */
771fe6b9 JG	91	temp = RREG32(rec->mask_clk_reg);
	92	if (lock_state)
	93	temp \|= rec->mask_clk_mask;
	94	else
	95	temp &= ~rec->mask_clk_mask;
	96	WREG32(rec->mask_clk_reg, temp);
	97	temp = RREG32(rec->mask_clk_reg);
	98
	99	temp = RREG32(rec->mask_data_reg);
	100	if (lock_state)
	101	temp \|= rec->mask_data_mask;
	102	else
	103	temp &= ~rec->mask_data_mask;
	104	WREG32(rec->mask_data_reg, temp);
	105	temp = RREG32(rec->mask_data_reg);
	106	}
	107
	108	static int get_clock(void *i2c_priv)
	109	{
	110	struct radeon_i2c_chan *i2c = i2c_priv;
	111	struct radeon_device *rdev = i2c->dev->dev_private;
	112	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	113	uint32_t val;
	114
9b9fe724 AD	115	/* read the value off the pin */
	116	val = RREG32(rec->y_clk_reg);
	117	val &= rec->y_clk_mask;
771fe6b9 JG	118
	119	return (val != 0);
	120	}
	121
	122
	123	static int get_data(void *i2c_priv)
	124	{
	125	struct radeon_i2c_chan *i2c = i2c_priv;
	126	struct radeon_device *rdev = i2c->dev->dev_private;
	127	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	128	uint32_t val;
	129
9b9fe724 AD	130	/* read the value off the pin */
	131	val = RREG32(rec->y_data_reg);
	132	val &= rec->y_data_mask;
	133
771fe6b9 JG	134	return (val != 0);
	135	}
	136
	137	static void set_clock(void *i2c_priv, int clock)
	138	{
	139	struct radeon_i2c_chan *i2c = i2c_priv;
	140	struct radeon_device *rdev = i2c->dev->dev_private;
	141	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	142	uint32_t val;
	143
9b9fe724 AD	144	/* set pin direction */
	145	val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
	146	val \|= clock ? 0 : rec->en_clk_mask;
	147	WREG32(rec->en_clk_reg, val);
771fe6b9 JG	148	}
	149
	150	static void set_data(void *i2c_priv, int data)
	151	{
	152	struct radeon_i2c_chan *i2c = i2c_priv;
	153	struct radeon_device *rdev = i2c->dev->dev_private;
	154	struct radeon_i2c_bus_rec *rec = &i2c->rec;
	155	uint32_t val;
	156
9b9fe724 AD	157	/* set pin direction */
	158	val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
	159	val \|= data ? 0 : rec->en_data_mask;
	160	WREG32(rec->en_data_reg, val);
771fe6b9 JG	161	}
	162
	163	struct radeon_i2c_chan radeon_i2c_create(struct drm_device dev,
ab1e9ea0 AD	164	struct radeon_i2c_bus_rec *rec,
ab1e9ea0 AD	165	const char *name)
771fe6b9 JG	166	{
	167	struct radeon_i2c_chan *i2c;
	168	int ret;
	169
9a298b2a	170	i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
771fe6b9 JG	171	if (i2c == NULL)
	172	return NULL;
	173
	174	i2c->adapter.owner = THIS_MODULE;
771fe6b9	175	i2c->dev = dev;
746c1aa4 DA	176	i2c_set_adapdata(&i2c->adapter, i2c);
	177	i2c->adapter.algo_data = &i2c->algo.bit;
	178	i2c->algo.bit.setsda = set_data;
	179	i2c->algo.bit.setscl = set_clock;
	180	i2c->algo.bit.getsda = get_data;
	181	i2c->algo.bit.getscl = get_clock;
	182	i2c->algo.bit.udelay = 20;
771fe6b9 JG	183	/* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
771fe6b9 JG	184	* make this, 2 jiffies is a lot more reliable */
746c1aa4 DA	185	i2c->algo.bit.timeout = 2;
746c1aa4 DA	186	i2c->algo.bit.data = i2c;
771fe6b9	187	i2c->rec = *rec;
771fe6b9 JG	188	ret = i2c_bit_add_bus(&i2c->adapter);
	189	if (ret) {
	190	DRM_INFO("Failed to register i2c %s\n", name);
	191	goto out_free;
	192	}
	193
	194	return i2c;
	195	out_free:
9a298b2a	196	kfree(i2c);
771fe6b9 JG	197	return NULL;
	198
	199	}
	200
746c1aa4 DA	201	struct radeon_i2c_chan radeon_i2c_create_dp(struct drm_device dev,
	202	const char *name, bool dp, u8 i2c_id)
	203	{
	204	struct radeon_i2c_chan *i2c;
	205	int ret;
	206
	207	i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
	208	if (i2c == NULL)
	209	return NULL;
	210
	211	i2c->i2c_id = i2c_id;
	212	i2c->adapter.owner = THIS_MODULE;
	213	i2c->dev = dev;
	214	i2c_set_adapdata(&i2c->adapter, i2c);
	215	i2c->adapter.algo_data = &i2c->algo.dp;
	216	i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
	217	i2c->algo.dp.address = 0;
	218	ret = i2c_dp_aux_add_bus(&i2c->adapter);
	219	if (ret) {
	220	DRM_INFO("Failed to register i2c %s\n", name);
	221	goto out_free;
	222	}
	223
	224	return i2c;
	225	out_free:
	226	kfree(i2c);
	227	return NULL;
	228
	229	}
	230
	231
771fe6b9 JG	232	void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
	233	{
	234	if (!i2c)
	235	return;
	236
	237	i2c_del_adapter(&i2c->adapter);
9a298b2a	238	kfree(i2c);
771fe6b9 JG	239	}
	240
	241	struct drm_encoder radeon_best_encoder(struct drm_connector connector)
	242	{
	243	return NULL;
	244	}
fcec570b AD	245
	246	void radeon_i2c_sw_get_byte(struct radeon_i2c_chan *i2c_bus,
	247	u8 slave_addr,
	248	u8 addr,
	249	u8 *val)
	250	{
	251	u8 out_buf[2];
	252	u8 in_buf[2];
	253	struct i2c_msg msgs[] = {
	254	{
	255	.addr = slave_addr,
	256	.flags = 0,
	257	.len = 1,
	258	.buf = out_buf,
	259	},
	260	{
	261	.addr = slave_addr,
	262	.flags = I2C_M_RD,
	263	.len = 1,
	264	.buf = in_buf,
	265	}
	266	};
	267
	268	out_buf[0] = addr;
	269	out_buf[1] = 0;
	270
	271	if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
	272	*val = in_buf[0];
	273	DRM_DEBUG("val = 0x%02x\n", *val);
	274	} else {
	275	DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",
	276	addr, *val);
	277	}
	278	}
	279
	280	void radeon_i2c_sw_put_byte(struct radeon_i2c_chan *i2c_bus,
	281	u8 slave_addr,
	282	u8 addr,
	283	u8 val)
	284	{
	285	uint8_t out_buf[2];
	286	struct i2c_msg msg = {
	287	.addr = slave_addr,
	288	.flags = 0,
	289	.len = 2,
	290	.buf = out_buf,
	291	};
	292
	293	out_buf[0] = addr;
	294	out_buf[1] = val;
	295
	296	if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
	297	DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",
	298	addr, val);
	299	}
	300