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serial: ns16550: Support ns16550 compatible pci uart devices
There are many pci uart devices which are ns16550 compatible. We can describe them in the board dts file and use it as the U-Boot serial console as specified in the chosen node 'stdout-path' property. Those pci uart devices can have their register be memory-mapped, or i/o-mapped. The driver will try to use the memory-mapped register if the reg property in the node has an entry to describe the memory-mapped register, otherwise i/o-mapped register will be used. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
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1 changed files with 31 additions and 0 deletions
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@ -289,7 +289,38 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
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struct ns16550_platdata *plat = dev->platdata;
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struct ns16550_platdata *plat = dev->platdata;
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fdt_addr_t addr;
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fdt_addr_t addr;
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/* try Processor Local Bus device first */
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addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
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addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
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#ifdef CONFIG_PCI
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if (addr == FDT_ADDR_T_NONE) {
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/* then try pci device */
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struct fdt_pci_addr pci_addr;
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u32 bar;
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int ret;
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/* we prefer to use a memory-mapped register */
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ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
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FDT_PCI_SPACE_MEM32, "reg",
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&pci_addr);
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if (ret) {
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/* try if there is any i/o-mapped register */
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ret = fdtdec_get_pci_addr(gd->fdt_blob,
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dev->of_offset,
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FDT_PCI_SPACE_IO,
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"reg", &pci_addr);
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if (ret)
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return ret;
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}
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ret = fdtdec_get_pci_bar32(gd->fdt_blob, dev->of_offset,
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&pci_addr, &bar);
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if (ret)
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return ret;
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addr = bar;
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}
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#endif
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if (addr == FDT_ADDR_T_NONE)
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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return -EINVAL;
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