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path: root/drivers/gpu/drm/radeon/radeon_i2c.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_i2c.c153
1 files changed, 73 insertions, 80 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index 4ae50c19589..5def6f5dff3 100644
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -59,6 +59,7 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
return false;
}
+/* bit banging i2c */
static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
{
@@ -181,13 +182,30 @@ static void set_data(void *i2c_priv, int data)
WREG32(rec->en_data_reg, val);
}
+static int pre_xfer(struct i2c_adapter *i2c_adap)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+
+ radeon_i2c_do_lock(i2c, 1);
+
+ return 0;
+}
+
+static void post_xfer(struct i2c_adapter *i2c_adap)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+
+ radeon_i2c_do_lock(i2c, 0);
+}
+
+/* hw i2c */
+
static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
{
- struct radeon_pll *spll = &rdev->clock.spll;
u32 sclk = radeon_get_engine_clock(rdev);
u32 prescale = 0;
- u32 n, m;
- u8 loop;
+ u32 nm;
+ u8 n, m, loop;
int i2c_clock;
switch (rdev->family) {
@@ -203,13 +221,15 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
case CHIP_R300:
case CHIP_R350:
case CHIP_RV350:
- n = (spll->reference_freq) / (4 * 6);
+ i2c_clock = 60;
+ nm = (sclk * 10) / (i2c_clock * 4);
for (loop = 1; loop < 255; loop++) {
- if ((loop * (loop - 1)) > n)
+ if ((nm / loop) < loop)
break;
}
- m = loop - 1;
- prescale = m | (loop << 8);
+ n = loop - 1;
+ m = loop - 2;
+ prescale = m | (n << 8);
break;
case CHIP_RV380:
case CHIP_RS400:
@@ -217,7 +237,6 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
case CHIP_R420:
case CHIP_R423:
case CHIP_RV410:
- sclk = radeon_get_engine_clock(rdev);
prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
break;
case CHIP_RS600:
@@ -232,7 +251,6 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
case CHIP_RV570:
case CHIP_R580:
i2c_clock = 50;
- sclk = radeon_get_engine_clock(rdev);
if (rdev->family == CHIP_R520)
prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
else
@@ -291,6 +309,7 @@ static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
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);
@@ -757,26 +776,13 @@ done:
return ret;
}
-static int radeon_sw_i2c_xfer(struct i2c_adapter *i2c_adap,
+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);
- int ret;
-
- radeon_i2c_do_lock(i2c, 1);
- ret = i2c_transfer(&i2c->algo.radeon.bit_adapter, msgs, num);
- radeon_i2c_do_lock(i2c, 0);
-
- return ret;
-}
-
-static int radeon_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;
+ int ret = 0;
switch (rdev->family) {
case CHIP_R100:
@@ -797,16 +803,12 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_RV410:
case CHIP_RS400:
case CHIP_RS480:
- if (rec->hw_capable)
- ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
- else
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
+ 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 */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_RV515:
case CHIP_R520:
@@ -814,20 +816,16 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_RV560:
case CHIP_RV570:
case CHIP_R580:
- if (rec->hw_capable) {
- if (rec->mm_i2c)
- ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
- else
- ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
- } else
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
+ 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 */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_RV620:
case CHIP_RV635:
@@ -838,7 +836,6 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_RV710:
case CHIP_RV740:
/* XXX fill in hw i2c implementation */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_CEDAR:
case CHIP_REDWOOD:
@@ -846,7 +843,6 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_CYPRESS:
case CHIP_HEMLOCK:
/* XXX fill in hw i2c implementation */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
default:
DRM_ERROR("i2c: unhandled radeon chip\n");
@@ -857,20 +853,21 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
return ret;
}
-static u32 radeon_i2c_func(struct i2c_adapter *adap)
+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_i2c_xfer,
- .functionality = radeon_i2c_func,
+ .master_xfer = radeon_hw_i2c_xfer,
+ .functionality = radeon_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;
@@ -878,37 +875,43 @@ struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
if (i2c == NULL)
return NULL;
- /* set the internal bit adapter */
- i2c->algo.radeon.bit_adapter.owner = THIS_MODULE;
- i2c_set_adapdata(&i2c->algo.radeon.bit_adapter, i2c);
- sprintf(i2c->algo.radeon.bit_adapter.name, "Radeon internal i2c bit bus %s", name);
- i2c->algo.radeon.bit_adapter.algo_data = &i2c->algo.radeon.bit_data;
- i2c->algo.radeon.bit_data.setsda = set_data;
- i2c->algo.radeon.bit_data.setscl = set_clock;
- i2c->algo.radeon.bit_data.getsda = get_data;
- i2c->algo.radeon.bit_data.getscl = get_clock;
- i2c->algo.radeon.bit_data.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.radeon.bit_data.timeout = 2;
- i2c->algo.radeon.bit_data.data = i2c;
- ret = i2c_bit_add_bus(&i2c->algo.radeon.bit_adapter);
- if (ret) {
- DRM_ERROR("Failed to register internal bit i2c %s\n", name);
- goto out_free;
- }
- /* set the radeon i2c adapter */
- i2c->dev = dev;
i2c->rec = *rec;
i2c->adapter.owner = THIS_MODULE;
+ i2c->dev = dev;
i2c_set_adapdata(&i2c->adapter, i2c);
- sprintf(i2c->adapter.name, "Radeon i2c %s", name);
- i2c->adapter.algo_data = &i2c->algo.radeon;
- i2c->adapter.algo = &radeon_i2c_algo;
- ret = i2c_add_adapter(&i2c->adapter);
- if (ret) {
- DRM_ERROR("Failed to register i2c %s\n", name);
- goto out_free;
+ 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 */
+ sprintf(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 {
+ /* set the radeon bit adapter */
+ sprintf(i2c->adapter.name, "Radeon i2c bit bus %s", name);
+ i2c->adapter.algo_data = &i2c->algo.bit;
+ i2c->algo.bit.pre_xfer = pre_xfer;
+ i2c->algo.bit.post_xfer = post_xfer;
+ 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;
+ ret = i2c_bit_add_bus(&i2c->adapter);
+ if (ret) {
+ DRM_ERROR("Failed to register bit i2c %s\n", name);
+ goto out_free;
+ }
}
return i2c;
@@ -953,16 +956,6 @@ void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
{
if (!i2c)
return;
- i2c_del_adapter(&i2c->algo.radeon.bit_adapter);
- i2c_del_adapter(&i2c->adapter);
- kfree(i2c);
-}
-
-void radeon_i2c_destroy_dp(struct radeon_i2c_chan *i2c)
-{
- if (!i2c)
- return;
-
i2c_del_adapter(&i2c->adapter);
kfree(i2c);
}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-23 09:02:03 +0000