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linux/drivers/gpu/drm/radeon/radeon_i2c.c

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/*
* 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 <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_edid.h>
#include <drm/radeon_drm.h>
#include "radeon.h"
#include "atom.h"
extern int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, int num);
extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
/**
* radeon_ddc_probe
*
*/
bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux)
{
u8 out = 0x0;
u8 buf[8];
int ret;
struct i2c_msg msgs[] = {
{
.addr = DDC_ADDR,
.flags = 0,
.len = 1,
.buf = &out,
},
{
.addr = DDC_ADDR,
.flags = I2C_M_RD,
.len = 8,
.buf = buf,
}
};
/* on hw with routers, select right port */
if (radeon_connector->router.ddc_valid)
radeon_router_select_ddc_port(radeon_connector);
if (use_aux) {
ret = i2c_transfer(&radeon_connector->ddc_bus->aux.ddc, msgs, 2);
} else {
ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
}
if (ret != 2)
/* Couldn't find an accessible DDC on this connector */
return false;
/* Probe also for valid EDID header
* EDID header starts with:
* 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
* Only the first 6 bytes must be valid as
* drm_edid_block_valid() can fix the last 2 bytes */
if (drm_edid_header_is_valid(buf) < 6) {
/* Couldn't find an accessible EDID on this
* connector */
return false;
}
return true;
}
/* bit banging i2c */
static int pre_xfer(struct i2c_adapter *i2c_adap)
{
struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
struct radeon_device *rdev = i2c->dev->dev_private;
struct radeon_i2c_bus_rec *rec = &i2c->rec;
uint32_t temp;
mutex_lock(&i2c->mutex);
/* 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 (rec->hw_capable) {
if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
u32 reg;
if (rdev->family >= CHIP_RV350)
reg = RADEON_GPIO_MONID;
else if ((rdev->family == CHIP_R300) ||
(rdev->family == CHIP_R350))
reg = RADEON_GPIO_DVI_DDC;
else
reg = RADEON_GPIO_CRT2_DDC;
mutex_lock(&rdev->dc_hw_i2c_mutex);
if (rec->a_clk_reg == reg) {
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)));
}
mutex_unlock(&rdev->dc_hw_i2c_mutex);
}
}
/* switch the pads to ddc mode */
if (ASIC_IS_DCE3(rdev) && rec->hw_capable) {
temp = RREG32(rec->mask_clk_reg);
temp &= ~(1 << 16);
WREG32(rec->mask_clk_reg, temp);
}
/* 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);
/* set the pins to input */
temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
WREG32(rec->en_clk_reg, temp);
temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
WREG32(rec->en_data_reg, temp);
/* mask the gpio pins for software use */
temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
WREG32(rec->mask_clk_reg, temp);
temp = RREG32(rec->mask_clk_reg);
temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
WREG32(rec->mask_data_reg, temp);
temp = RREG32(rec->mask_data_reg);
return 0;
}
static void post_xfer(struct i2c_adapter *i2c_adap)
{
struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
struct radeon_device *rdev = i2c->dev->dev_private;
struct radeon_i2c_bus_rec *rec = &i2c->rec;
uint32_t temp;
/* unmask the gpio pins for software use */
temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
WREG32(rec->mask_clk_reg, temp);
temp = RREG32(rec->mask_clk_reg);
temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
WREG32(rec->mask_data_reg, temp);
temp = RREG32(rec->mask_data_reg);
mutex_unlock(&i2c->mutex);
}
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);
}
/* hw i2c */
static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
{
u32 sclk = rdev->pm.current_sclk;
u32 prescale = 0;
u32 nm;
u8 n, m, loop;
int i2c_clock;
switch (rdev->family) {
case CHIP_R100:
case CHIP_RV100:
case CHIP_RS100:
case CHIP_RV200:
case CHIP_RS200:
case CHIP_R200:
case CHIP_RV250:
case CHIP_RS300:
case CHIP_RV280:
case CHIP_R300:
case CHIP_R350:
case CHIP_RV350:
i2c_clock = 60;
nm = (sclk * 10) / (i2c_clock * 4);
for (loop = 1; loop < 255; loop++) {
if ((nm / loop) < loop)
break;
}
n = loop - 1;
m = loop - 2;
prescale = m | (n << 8);
break;
case CHIP_RV380:
case CHIP_RS400:
case CHIP_RS480:
case CHIP_R420:
case CHIP_R423:
case CHIP_RV410:
prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
break;
case CHIP_RS600:
case CHIP_RS690:
case CHIP_RS740:
/* todo */
break;
case CHIP_RV515:
case CHIP_R520:
case CHIP_RV530:
case CHIP_RV560:
case CHIP_RV570:
case CHIP_R580:
i2c_clock = 50;
if (rdev->family == CHIP_R520)
prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
else
prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
break;
case CHIP_R600:
case CHIP_RV610:
case CHIP_RV630:
case CHIP_RV670:
/* todo */
break;
case CHIP_RV620:
case CHIP_RV635:
case CHIP_RS780:
case CHIP_RS880:
case CHIP_RV770:
case CHIP_RV730:
case CHIP_RV710:
case CHIP_RV740:
/* todo */
break;
case CHIP_CEDAR:
case CHIP_REDWOOD:
case CHIP_JUNIPER:
case CHIP_CYPRESS:
case CHIP_HEMLOCK:
/* todo */
break;
default:
DRM_ERROR("i2c: unhandled radeon chip\n");
break;
}
return prescale;
}
/* hw i2c engine for r1xx-4xx hardware
* hw can buffer up to 15 bytes
*/
static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, int num)
{
struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
struct radeon_device *rdev = i2c->dev->dev_private;
struct radeon_i2c_bus_rec *rec = &i2c->rec;
struct i2c_msg *p;
int i, j, k, ret = num;
u32 prescale;
u32 i2c_cntl_0, i2c_cntl_1, i2c_data;
u32 tmp, reg;
mutex_lock(&rdev->dc_hw_i2c_mutex);
/* take the pm lock since we need a constant sclk */
mutex_lock(&rdev->pm.mutex);
prescale = radeon_get_i2c_prescale(rdev);
reg = ((prescale << RADEON_I2C_PRESCALE_SHIFT) |
RADEON_I2C_DRIVE_EN |
RADEON_I2C_START |
RADEON_I2C_STOP |
RADEON_I2C_GO);
if (rdev->is_atom_bios) {
tmp = RREG32(RADEON_BIOS_6_SCRATCH);
WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
}
if (rec->mm_i2c) {
i2c_cntl_0 = RADEON_I2C_CNTL_0;
i2c_cntl_1 = RADEON_I2C_CNTL_1;
i2c_data = RADEON_I2C_DATA;
} else {
i2c_cntl_0 = RADEON_DVI_I2C_CNTL_0;
i2c_cntl_1 = RADEON_DVI_I2C_CNTL_1;
i2c_data = RADEON_DVI_I2C_DATA;
switch (rdev->family) {
case CHIP_R100:
case CHIP_RV100:
case CHIP_RS100:
case CHIP_RV200:
case CHIP_RS200:
case CHIP_RS300:
switch (rec->mask_clk_reg) {
case RADEON_GPIO_DVI_DDC:
/* no gpio select bit */
break;
default:
DRM_ERROR("gpio not supported with hw i2c\n");
ret = -EINVAL;
goto done;
}
break;
case CHIP_R200:
/* only bit 4 on r200 */
switch (rec->mask_clk_reg) {
case RADEON_GPIO_DVI_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
break;
case RADEON_GPIO_MONID:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
break;
default:
DRM_ERROR("gpio not supported with hw i2c\n");
ret = -EINVAL;
goto done;
}
break;
case CHIP_RV250:
case CHIP_RV280:
/* bits 3 and 4 */
switch (rec->mask_clk_reg) {
case RADEON_GPIO_DVI_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
break;
case RADEON_GPIO_VGA_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
break;
case RADEON_GPIO_CRT2_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
break;
default:
DRM_ERROR("gpio not supported with hw i2c\n");
ret = -EINVAL;
goto done;
}
break;
case CHIP_R300:
case CHIP_R350:
/* only bit 4 on r300/r350 */
switch (rec->mask_clk_reg) {
case RADEON_GPIO_VGA_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
break;
case RADEON_GPIO_DVI_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
break;
default:
DRM_ERROR("gpio not supported with hw i2c\n");
ret = -EINVAL;
goto done;
}
break;
case CHIP_RV350:
case CHIP_RV380:
case CHIP_R420:
case CHIP_R423:
case CHIP_RV410:
case CHIP_RS400:
case CHIP_RS480:
/* bits 3 and 4 */
switch (rec->mask_clk_reg) {
case RADEON_GPIO_VGA_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
break;
case RADEON_GPIO_DVI_DDC:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
break;
case RADEON_GPIO_MONID:
reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
break;
default:
DRM_ERROR("gpio not supported with hw i2c\n");
ret = -EINVAL;
goto done;
}
break;
default:
DRM_ERROR("unsupported asic\n");
ret = -EINVAL;
goto done;
break;
}
}
/* check for bus probe */
p = &msgs[0];
if ((num == 1) && (p->len == 0)) {
WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
RADEON_I2C_NACK |
RADEON_I2C_HALT |
RADEON_I2C_SOFT_RST));
WREG32(i2c_data, (p->addr << 1) & 0xff);
WREG32(i2c_data, 0);
WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
(1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
RADEON_I2C_EN |
(48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
WREG32(i2c_cntl_0, reg);
for (k = 0; k < 32; k++) {
udelay(10);
tmp = RREG32(i2c_cntl_0);
if (tmp & RADEON_I2C_GO)
continue;
tmp = RREG32(i2c_cntl_0);
if (tmp & RADEON_I2C_DONE)
break;
else {
DRM_DEBUG("i2c write error 0x%08x\n", tmp);
WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
ret = -EIO;
goto done;
}
}
goto done;
}
for (i = 0; i < num; i++) {
p = &msgs[i];
for (j = 0; j < p->len; j++) {
if (p->flags & I2C_M_RD) {
WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
RADEON_I2C_NACK |
RADEON_I2C_HALT |
RADEON_I2C_SOFT_RST));
WREG32(i2c_data, ((p->addr << 1) & 0xff) | 0x1);
WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
(1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
RADEON_I2C_EN |
(48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
WREG32(i2c_cntl_0, reg | RADEON_I2C_RECEIVE);
for (k = 0; k < 32; k++) {
udelay(10);
tmp = RREG32(i2c_cntl_0);
if (tmp & RADEON_I2C_GO)
continue;
tmp = RREG32(i2c_cntl_0);
if (tmp & RADEON_I2C_DONE)
break;
else {
DRM_DEBUG("i2c read error 0x%08x\n", tmp);
WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
ret = -EIO;
goto done;
}
}
p->buf[j] = RREG32(i2c_data) & 0xff;
} else {
WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
RADEON_I2C_NACK |
RADEON_I2C_HALT |
RADEON_I2C_SOFT_RST));
WREG32(i2c_data, (p->addr << 1) & 0xff);
WREG32(i2c_data, p->buf[j]);
WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
(1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
RADEON_I2C_EN |
(48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
WREG32(i2c_cntl_0, reg);
for (k = 0; k < 32; k++) {
udelay(10);
tmp = RREG32(i2c_cntl_0);
if (tmp & RADEON_I2C_GO)
continue;
tmp = RREG32(i2c_cntl_0);
if (tmp & RADEON_I2C_DONE)
break;
else {
DRM_DEBUG("i2c write error 0x%08x\n", tmp);
WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
ret = -EIO;
goto done;
}
}
}
}
}
done:
WREG32(i2c_cntl_0, 0);
WREG32(i2c_cntl_1, 0);
WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
RADEON_I2C_NACK |
RADEON_I2C_HALT |
RADEON_I2C_SOFT_RST));
if (rdev->is_atom_bios) {
tmp = RREG32(RADEON_BIOS_6_SCRATCH);
tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
WREG32(RADEON_BIOS_6_SCRATCH, tmp);
}
mutex_unlock(&rdev->pm.mutex);
mutex_unlock(&rdev->dc_hw_i2c_mutex);
return ret;
}
/* hw i2c engine for r5xx hardware
* hw can buffer up to 15 bytes
*/
static int r500_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, int num)
{
struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
struct radeon_device *rdev = i2c->dev->dev_private;
struct radeon_i2c_bus_rec *rec = &i2c->rec;
struct i2c_msg *p;
int i, j, remaining, current_count, buffer_offset, ret = num;
u32 prescale;
u32 tmp, reg;
u32 saved1, saved2;
mutex_lock(&rdev->dc_hw_i2c_mutex);
/* take the pm lock since we need a constant sclk */
mutex_lock(&rdev->pm.mutex);
prescale = radeon_get_i2c_prescale(rdev);
/* clear gpio mask bits */
tmp = RREG32(rec->mask_clk_reg);
tmp &= ~rec->mask_clk_mask;
WREG32(rec->mask_clk_reg, tmp);
tmp = RREG32(rec->mask_clk_reg);
tmp = RREG32(rec->mask_data_reg);
tmp &= ~rec->mask_data_mask;
WREG32(rec->mask_data_reg, tmp);
tmp = RREG32(rec->mask_data_reg);
/* clear pin values */
tmp = RREG32(rec->a_clk_reg);
tmp &= ~rec->a_clk_mask;
WREG32(rec->a_clk_reg, tmp);
tmp = RREG32(rec->a_clk_reg);
tmp = RREG32(rec->a_data_reg);
tmp &= ~rec->a_data_mask;
WREG32(rec->a_data_reg, tmp);
tmp = RREG32(rec->a_data_reg);
/* set the pins to input */
tmp = RREG32(rec->en_clk_reg);
tmp &= ~rec->en_clk_mask;
WREG32(rec->en_clk_reg, tmp);
tmp = RREG32(rec->en_clk_reg);
tmp = RREG32(rec->en_data_reg);
tmp &= ~rec->en_data_mask;
WREG32(rec->en_data_reg, tmp);
tmp = RREG32(rec->en_data_reg);
/* */
tmp = RREG32(RADEON_BIOS_6_SCRATCH);
WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
saved1 = RREG32(AVIVO_DC_I2C_CONTROL1);
saved2 = RREG32(0x494);
WREG32(0x494, saved2 | 0x1);
WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_WANTS_TO_USE_I2C);
for (i = 0; i < 50; i++) {
udelay(1);
if (RREG32(AVIVO_DC_I2C_ARBITRATION) & AVIVO_DC_I2C_SW_CAN_USE_I2C)
break;
}
if (i == 50) {
DRM_ERROR("failed to get i2c bus\n");
ret = -EBUSY;
goto done;
}
reg = AVIVO_DC_I2C_START | AVIVO_DC_I2C_STOP | AVIVO_DC_I2C_EN;
switch (rec->mask_clk_reg) {
case AVIVO_DC_GPIO_DDC1_MASK:
reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC1);
break;
case AVIVO_DC_GPIO_DDC2_MASK:
reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC2);
break;
case AVIVO_DC_GPIO_DDC3_MASK:
reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC3);
break;
default:
DRM_ERROR("gpio not supported with hw i2c\n");
ret = -EINVAL;
goto done;
}
/* check for bus probe */
p = &msgs[0];
if ((num == 1) && (p->len == 0)) {
WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
AVIVO_DC_I2C_NACK |
AVIVO_DC_I2C_HALT));
WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
udelay(1);
WREG32(AVIVO_DC_I2C_RESET, 0);
WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
WREG32(AVIVO_DC_I2C_DATA, 0);
WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
AVIVO_DC_I2C_DATA_COUNT(1) |
(prescale << 16)));
WREG32(AVIVO_DC_I2C_CONTROL1, reg);
WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
for (j = 0; j < 200; j++) {
udelay(50);
tmp = RREG32(AVIVO_DC_I2C_STATUS1);
if (tmp & AVIVO_DC_I2C_GO)
continue;
tmp = RREG32(AVIVO_DC_I2C_STATUS1);
if (tmp & AVIVO_DC_I2C_DONE)
break;
else {
DRM_DEBUG("i2c write error 0x%08x\n", tmp);
WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
ret = -EIO;
goto done;
}
}
goto done;
}
for (i = 0; i < num; i++) {
p = &msgs[i];
remaining = p->len;
buffer_offset = 0;
if (p->flags & I2C_M_RD) {
while (remaining) {
if (remaining > 15)
current_count = 15;
else
current_count = remaining;
WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
AVIVO_DC_I2C_NACK |
AVIVO_DC_I2C_HALT));
WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
udelay(1);
WREG32(AVIVO_DC_I2C_RESET, 0);
WREG32(AVIVO_DC_I2C_DATA, ((p->addr << 1) & 0xff) | 0x1);
WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
AVIVO_DC_I2C_DATA_COUNT(current_count) |
(prescale << 16)));
WREG32(AVIVO_DC_I2C_CONTROL1, reg | AVIVO_DC_I2C_RECEIVE);
WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
for (j = 0; j < 200; j++) {
udelay(50);
tmp = RREG32(AVIVO_DC_I2C_STATUS1);
if (tmp & AVIVO_DC_I2C_GO)
continue;
tmp = RREG32(AVIVO_DC_I2C_STATUS1);
if (tmp & AVIVO_DC_I2C_DONE)
break;
else {
DRM_DEBUG("i2c read error 0x%08x\n", tmp);
WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
ret = -EIO;
goto done;
}
}
for (j = 0; j < current_count; j++)
p->buf[buffer_offset + j] = RREG32(AVIVO_DC_I2C_DATA) & 0xff;
remaining -= current_count;
buffer_offset += current_count;
}
} else {
while (remaining) {
if (remaining > 15)
current_count = 15;
else
current_count = remaining;
WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
AVIVO_DC_I2C_NACK |
AVIVO_DC_I2C_HALT));
WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
udelay(1);
WREG32(AVIVO_DC_I2C_RESET, 0);
WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
for (j = 0; j < current_count; j++)
WREG32(AVIVO_DC_I2C_DATA, p->buf[buffer_offset + j]);
WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
AVIVO_DC_I2C_DATA_COUNT(current_count) |
(prescale << 16)));
WREG32(AVIVO_DC_I2C_CONTROL1, reg);
WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
for (j = 0; j < 200; j++) {
udelay(50);
tmp = RREG32(AVIVO_DC_I2C_STATUS1);
if (tmp & AVIVO_DC_I2C_GO)
continue;
tmp = RREG32(AVIVO_DC_I2C_STATUS1);
if (tmp & AVIVO_DC_I2C_DONE)
break;
else {
DRM_DEBUG("i2c write error 0x%08x\n", tmp);
WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
ret = -EIO;
goto done;
}
}
remaining -= current_count;
buffer_offset += current_count;
}
}
}
done:
WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
AVIVO_DC_I2C_NACK |
AVIVO_DC_I2C_HALT));
WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
udelay(1);
WREG32(AVIVO_DC_I2C_RESET, 0);
WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_DONE_USING_I2C);
WREG32(AVIVO_DC_I2C_CONTROL1, saved1);
WREG32(0x494, saved2);
tmp = RREG32(RADEON_BIOS_6_SCRATCH);
tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
WREG32(RADEON_BIOS_6_SCRATCH, tmp);
mutex_unlock(&rdev->pm.mutex);
mutex_unlock(&rdev->dc_hw_i2c_mutex);
return ret;
}
static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, int num)
{
struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
struct radeon_device *rdev = i2c->dev->dev_private;
struct radeon_i2c_bus_rec *rec = &i2c->rec;
int ret = 0;
mutex_lock(&i2c->mutex);
switch (rdev->family) {
case CHIP_R100:
case CHIP_RV100:
case CHIP_RS100:
case CHIP_RV200:
case CHIP_RS200:
case CHIP_R200:
case CHIP_RV250:
case CHIP_RS300:
case CHIP_RV280:
case CHIP_R300:
case CHIP_R350:
case CHIP_RV350:
case CHIP_RV380:
case CHIP_R420:
case CHIP_R423:
case CHIP_RV410:
case CHIP_RS400:
case CHIP_RS480:
ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_RS600:
case CHIP_RS690:
case CHIP_RS740:
/* XXX fill in hw i2c implementation */
break;
case CHIP_RV515:
case CHIP_R520:
case CHIP_RV530:
case CHIP_RV560:
case CHIP_RV570:
case CHIP_R580:
if (rec->mm_i2c)
ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
else
ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_R600:
case CHIP_RV610:
case CHIP_RV630:
case CHIP_RV670:
/* XXX fill in hw i2c implementation */
break;
case CHIP_RV620:
case CHIP_RV635:
case CHIP_RS780:
case CHIP_RS880:
case CHIP_RV770:
case CHIP_RV730:
case CHIP_RV710:
case CHIP_RV740:
/* XXX fill in hw i2c implementation */
break;
case CHIP_CEDAR:
case CHIP_REDWOOD:
case CHIP_JUNIPER:
case CHIP_CYPRESS:
case CHIP_HEMLOCK:
/* XXX fill in hw i2c implementation */
break;
default:
DRM_ERROR("i2c: unhandled radeon chip\n");
ret = -EIO;
break;
}
mutex_unlock(&i2c->mutex);
return ret;
}
static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_algorithm radeon_i2c_algo = {
.master_xfer = radeon_hw_i2c_xfer,
.functionality = radeon_hw_i2c_func,
};
static const struct i2c_algorithm radeon_atom_i2c_algo = {
.master_xfer = radeon_atom_hw_i2c_xfer,
.functionality = radeon_atom_hw_i2c_func,
};
struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
struct radeon_i2c_bus_rec *rec,
const char *name)
{
struct radeon_device *rdev = dev->dev_private;
struct radeon_i2c_chan *i2c;
int ret;
/* don't add the mm_i2c bus unless hw_i2c is enabled */
if (rec->mm_i2c && (radeon_hw_i2c == 0))
return NULL;
i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
if (i2c == NULL)
return NULL;
i2c->rec = *rec;
i2c->adapter.owner = THIS_MODULE;
i2c->adapter.class = I2C_CLASS_DDC;
i2c->adapter.dev.parent = &dev->pdev->dev;
i2c->dev = dev;
i2c_set_adapdata(&i2c->adapter, i2c);
mutex_init(&i2c->mutex);
if (rec->mm_i2c ||
(rec->hw_capable &&
radeon_hw_i2c &&
((rdev->family <= CHIP_RS480) ||
((rdev->family >= CHIP_RV515) && (rdev->family <= CHIP_R580))))) {
/* set the radeon hw i2c adapter */
snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
"Radeon i2c hw bus %s", name);
i2c->adapter.algo = &radeon_i2c_algo;
ret = i2c_add_adapter(&i2c->adapter);
if (ret) {
DRM_ERROR("Failed to register hw i2c %s\n", name);
goto out_free;
}
} else if (rec->hw_capable &&
radeon_hw_i2c &&
ASIC_IS_DCE3(rdev)) {
/* hw i2c using atom */
snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
"Radeon i2c hw bus %s", name);
i2c->adapter.algo = &radeon_atom_i2c_algo;
ret = i2c_add_adapter(&i2c->adapter);
if (ret) {
DRM_ERROR("Failed to register hw i2c %s\n", name);
goto out_free;
}
} else {
/* set the radeon bit adapter */
snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
"Radeon i2c bit bus %s", name);
i2c->adapter.algo_data = &i2c->bit;
i2c->bit.pre_xfer = pre_xfer;
i2c->bit.post_xfer = post_xfer;
i2c->bit.setsda = set_data;
i2c->bit.setscl = set_clock;
i2c->bit.getsda = get_data;
i2c->bit.getscl = get_clock;
i2c->bit.udelay = 10;
i2c->bit.timeout = usecs_to_jiffies(2200); /* from VESA */
i2c->bit.data = i2c;
ret = i2c_bit_add_bus(&i2c->adapter);
if (ret) {
DRM_ERROR("Failed to register bit 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);
if (i2c->has_aux)
drm_dp_aux_unregister_i2c_bus(&i2c->aux);
kfree(i2c);
}
/* Add the default buses */
void radeon_i2c_init(struct radeon_device *rdev)
{
if (radeon_hw_i2c)
DRM_INFO("hw_i2c forced on, you may experience display detection problems!\n");
if (rdev->is_atom_bios)
radeon_atombios_i2c_init(rdev);
else
radeon_combios_i2c_init(rdev);
}
/* remove all the buses */
void radeon_i2c_fini(struct radeon_device *rdev)
{
int i;
for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
if (rdev->i2c_bus[i]) {
radeon_i2c_destroy(rdev->i2c_bus[i]);
rdev->i2c_bus[i] = NULL;
}
}
}
/* Add additional buses */
void radeon_i2c_add(struct radeon_device *rdev,
struct radeon_i2c_bus_rec *rec,
const char *name)
{
struct drm_device *dev = rdev->ddev;
int i;
for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
if (!rdev->i2c_bus[i]) {
rdev->i2c_bus[i] = radeon_i2c_create(dev, rec, name);
return;
}
}
}
/* looks up bus based on id */
struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
struct radeon_i2c_bus_rec *i2c_bus)
{
int i;
for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
if (rdev->i2c_bus[i] &&
(rdev->i2c_bus[i]->rec.i2c_id == i2c_bus->i2c_id)) {
return rdev->i2c_bus[i];
}
}
return NULL;
}
struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
{
return NULL;
}
void radeon_i2c_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_DEBUG("i2c 0x%02x 0x%02x read failed\n",
addr, *val);
}
}
void radeon_i2c_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_DEBUG("i2c 0x%02x 0x%02x write failed\n",
addr, val);
}
/* ddc router switching */
void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
{
u8 val;
if (!radeon_connector->router.ddc_valid)
return;
if (!radeon_connector->router_bus)
return;
radeon_i2c_get_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x3, &val);
val &= ~radeon_connector->router.ddc_mux_control_pin;
radeon_i2c_put_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x3, val);
radeon_i2c_get_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x1, &val);
val &= ~radeon_connector->router.ddc_mux_control_pin;
val |= radeon_connector->router.ddc_mux_state;
radeon_i2c_put_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x1, val);
}
/* clock/data router switching */
void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
{
u8 val;
if (!radeon_connector->router.cd_valid)
return;
if (!radeon_connector->router_bus)
return;
radeon_i2c_get_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x3, &val);
val &= ~radeon_connector->router.cd_mux_control_pin;
radeon_i2c_put_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x3, val);
radeon_i2c_get_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x1, &val);
val &= ~radeon_connector->router.cd_mux_control_pin;
val |= radeon_connector->router.cd_mux_state;
radeon_i2c_put_byte(radeon_connector->router_bus,
radeon_connector->router.i2c_addr,
0x1, val);
}
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