Adobe Photoshop CC 2014 v.14.xx - Manual (Page 695)

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Choose Change Text Orientation from the Character panel menu.
Rasterize type layers
Some commands and tools—such as filter effects and painting tools—are not available for type layers. You must rasterize the type before
applying the command or using the tool. Rasterizing converts the type layer into a normal layer and makes its contents uneditable as text.
A warning message appears if you choose a command or tool that requires a rasterized layer. Some warning messages provide an OK button
you can click to rasterize the layer.
Select the type layer and choose Layer > Rasterize > Type.
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