i2c/powermac: Improve detection of devices from device-tree
This patch adds a number of workarounds for broken Apple device-trees mostly around sound chips. It handles creating the missing audio codec devices and works around various issues with missing addresses or missing compatible properties. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Родитель
e1612de9e4
Коммит
3a3dd0186f
|
@ -227,28 +227,138 @@ static int __devexit i2c_powermac_remove(struct platform_device *dev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static u32 __devinit i2c_powermac_get_addr(struct i2c_adapter *adap,
|
||||
struct pmac_i2c_bus *bus,
|
||||
struct device_node *node)
|
||||
{
|
||||
const __be32 *prop;
|
||||
int len;
|
||||
|
||||
/* First check for valid "reg" */
|
||||
prop = of_get_property(node, "reg", &len);
|
||||
if (prop && (len >= sizeof(int)))
|
||||
return (be32_to_cpup(prop) & 0xff) >> 1;
|
||||
|
||||
/* Then check old-style "i2c-address" */
|
||||
prop = of_get_property(node, "i2c-address", &len);
|
||||
if (prop && (len >= sizeof(int)))
|
||||
return (be32_to_cpup(prop) & 0xff) >> 1;
|
||||
|
||||
/* Now handle some devices with missing "reg" properties */
|
||||
if (!strcmp(node->name, "cereal"))
|
||||
return 0x60;
|
||||
else if (!strcmp(node->name, "deq"))
|
||||
return 0x34;
|
||||
|
||||
dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
|
||||
|
||||
return 0xffffffff;
|
||||
}
|
||||
|
||||
static void __devinit i2c_powermac_create_one(struct i2c_adapter *adap,
|
||||
const char *type,
|
||||
u32 addr)
|
||||
{
|
||||
struct i2c_board_info info = {};
|
||||
struct i2c_client *newdev;
|
||||
|
||||
strncpy(info.type, type, sizeof(info.type));
|
||||
info.addr = addr;
|
||||
newdev = i2c_new_device(adap, &info);
|
||||
if (!newdev)
|
||||
dev_err(&adap->dev,
|
||||
"i2c-powermac: Failure to register missing %s\n",
|
||||
type);
|
||||
}
|
||||
|
||||
static void __devinit i2c_powermac_add_missing(struct i2c_adapter *adap,
|
||||
struct pmac_i2c_bus *bus,
|
||||
bool found_onyx)
|
||||
{
|
||||
struct device_node *busnode = pmac_i2c_get_bus_node(bus);
|
||||
int rc;
|
||||
|
||||
/* Check for the onyx audio codec */
|
||||
#define ONYX_REG_CONTROL 67
|
||||
if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
|
||||
union i2c_smbus_data data;
|
||||
|
||||
rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
|
||||
ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
|
||||
&data);
|
||||
if (rc >= 0)
|
||||
i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
|
||||
|
||||
rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
|
||||
ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
|
||||
&data);
|
||||
if (rc >= 0)
|
||||
i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
|
||||
}
|
||||
}
|
||||
|
||||
static bool __devinit i2c_powermac_get_type(struct i2c_adapter *adap,
|
||||
struct device_node *node,
|
||||
u32 addr, char *type, int type_size)
|
||||
{
|
||||
char tmp[16];
|
||||
|
||||
/* Note: we to _NOT_ want the standard
|
||||
* i2c drivers to match with any of our powermac stuff
|
||||
* unless they have been specifically modified to handle
|
||||
* it on a case by case basis. For example, for thermal
|
||||
* control, things like lm75 etc... shall match with their
|
||||
* corresponding windfarm drivers, _NOT_ the generic ones,
|
||||
* so we force a prefix of AAPL, onto the modalias to
|
||||
* make that happen
|
||||
*/
|
||||
|
||||
/* First try proper modalias */
|
||||
if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
|
||||
snprintf(type, type_size, "MAC,%s", tmp);
|
||||
return true;
|
||||
}
|
||||
|
||||
/* Now look for known workarounds */
|
||||
if (!strcmp(node->name, "deq")) {
|
||||
/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
|
||||
if (addr == 0x34) {
|
||||
snprintf(type, type_size, "MAC,tas3001");
|
||||
return true;
|
||||
} else if (addr == 0x35) {
|
||||
snprintf(type, type_size, "MAC,tas3004");
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
dev_err(&adap->dev, "i2c-powermac: modalias failure"
|
||||
" on %s\n", node->full_name);
|
||||
return false;
|
||||
}
|
||||
|
||||
static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap,
|
||||
struct pmac_i2c_bus *bus)
|
||||
{
|
||||
struct i2c_client *newdev;
|
||||
struct device_node *node;
|
||||
bool found_onyx = 0;
|
||||
|
||||
/*
|
||||
* In some cases we end up with the via-pmu node itself, in this
|
||||
* case we skip this function completely as the device-tree will
|
||||
* not contain anything useful.
|
||||
*/
|
||||
if (!strcmp(adap->dev.of_node->name, "via-pmu"))
|
||||
return;
|
||||
|
||||
for_each_child_of_node(adap->dev.of_node, node) {
|
||||
struct i2c_board_info info = {};
|
||||
struct dev_archdata dev_ad = {};
|
||||
const __be32 *reg;
|
||||
char tmp[16];
|
||||
u32 addr;
|
||||
int len;
|
||||
|
||||
/* Get address & channel */
|
||||
reg = of_get_property(node, "reg", &len);
|
||||
if (!reg || (len < sizeof(int))) {
|
||||
dev_err(&adap->dev, "i2c-powermac: invalid reg on %s\n",
|
||||
node->full_name);
|
||||
addr = i2c_powermac_get_addr(adap, bus, node);
|
||||
if (addr == 0xffffffff)
|
||||
continue;
|
||||
}
|
||||
addr = be32_to_cpup(reg);
|
||||
|
||||
/* Multibus setup, check channel */
|
||||
if (!pmac_i2c_match_adapter(node, adap))
|
||||
|
@ -257,27 +367,23 @@ static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap,
|
|||
dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
|
||||
node->full_name);
|
||||
|
||||
/* Make up a modalias. Note: we to _NOT_ want the standard
|
||||
* i2c drivers to match with any of our powermac stuff
|
||||
* unless they have been specifically modified to handle
|
||||
* it on a case by case basis. For example, for thermal
|
||||
* control, things like lm75 etc... shall match with their
|
||||
* corresponding windfarm drivers, _NOT_ the generic ones,
|
||||
* so we force a prefix of AAPL, onto the modalias to
|
||||
* make that happen
|
||||
/*
|
||||
* Keep track of some device existence to handle
|
||||
* workarounds later.
|
||||
*/
|
||||
if (of_modalias_node(node, tmp, sizeof(tmp)) < 0) {
|
||||
dev_err(&adap->dev, "i2c-powermac: modalias failure"
|
||||
" on %s\n", node->full_name);
|
||||
if (of_device_is_compatible(node, "pcm3052"))
|
||||
found_onyx = true;
|
||||
|
||||
/* Make up a modalias */
|
||||
if (!i2c_powermac_get_type(adap, node, addr,
|
||||
info.type, sizeof(info.type))) {
|
||||
continue;
|
||||
}
|
||||
snprintf(info.type, sizeof(info.type), "MAC,%s", tmp);
|
||||
|
||||
/* Fill out the rest of the info structure */
|
||||
info.addr = (addr & 0xff) >> 1;
|
||||
info.addr = addr;
|
||||
info.irq = irq_of_parse_and_map(node, 0);
|
||||
info.of_node = of_node_get(node);
|
||||
info.archdata = &dev_ad;
|
||||
|
||||
newdev = i2c_new_device(adap, &info);
|
||||
if (!newdev) {
|
||||
|
@ -292,6 +398,9 @@ static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap,
|
|||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
/* Additional workarounds */
|
||||
i2c_powermac_add_missing(adap, bus, found_onyx);
|
||||
}
|
||||
|
||||
static int __devinit i2c_powermac_probe(struct platform_device *dev)
|
||||
|
|
Загрузка…
Ссылка в новой задаче