forked from Mirrors/opensbi
lib: utils/serial: support 'reg-offset' property
reg-offset property is used for offset to apply to the mapbase from the start of the registers in 8250 UART. In Linux kernel, it has been handled in 8250 UART driver. dt-bindings: <linux>/Documentation/devicetree/bindings/serial/8250.yaml Signed-off-by: Zong Li <zong.li@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org>
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@@ -21,6 +21,7 @@
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#define DEFAULT_UART_BAUD 115200
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#define DEFAULT_UART_REG_SHIFT 0
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#define DEFAULT_UART_REG_IO_WIDTH 1
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#define DEFAULT_UART_REG_OFFSET 0
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#define DEFAULT_SIFIVE_UART_FREQ 0
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#define DEFAULT_SIFIVE_UART_BAUD 115200
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@@ -449,6 +450,12 @@ int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
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else
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uart->reg_io_width = DEFAULT_UART_REG_IO_WIDTH;
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val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "reg-offset", &len);
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if (len > 0 && val)
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uart->reg_offset = fdt32_to_cpu(*val);
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else
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uart->reg_offset = DEFAULT_UART_REG_OFFSET;
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return 0;
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}
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@@ -22,7 +22,8 @@ static int serial_uart8250_init(void *fdt, int nodeoff,
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return rc;
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return uart8250_init(uart.addr, uart.freq, uart.baud,
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uart.reg_shift, uart.reg_io_width);
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uart.reg_shift, uart.reg_io_width,
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uart.reg_offset);
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}
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static const struct fdt_match serial_uart8250_match[] = {
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@@ -91,11 +91,11 @@ static struct sbi_console_device uart8250_console = {
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};
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int uart8250_init(unsigned long base, u32 in_freq, u32 baudrate, u32 reg_shift,
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u32 reg_width)
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u32 reg_width, u32 reg_offset)
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{
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u16 bdiv;
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uart8250_base = (volatile char *)base;
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uart8250_base = (volatile char *)base + reg_offset;
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uart8250_reg_shift = reg_shift;
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uart8250_reg_width = reg_width;
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uart8250_in_freq = in_freq;
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