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serial: sh-sci: Compute the regshift value for SCI ports

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SCI instances found in SH SoCs have different spacing between registers
depending on the SoC. The platform data contains a regshift field that
tells the driver by how many bits to shift the register offset to
compute its address. We can compute the regshift value automatically
based on the memory resource size, there's no need to pass the value
through platform data.

Fix the sh7750 SCI and sh7760 SIM port memory resources length to ensure
proper computation of the regshift value.

Signed-off-by: Laurent Pinchart <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Laurent Pinchart 2017-01-11 16:43:40 +02:00 • committed by Greg Kroah-Hartman
commit dfc80387ae
5 changed files with 16 additions and 7 deletions
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8
drivers/tty/serial/sh-sci.c
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@ -2574,9 +2574,15 @@ static int sci_init_single(struct platform_device *dev,
port->type = p->type;
port->flags = UPF_FIXED_PORT | UPF_BOOT_AUTOCONF | p->flags;
port->regshift = p->regshift;
port->fifosize = sci_port->params->fifosize;
if (port->type == PORT_SCI) {
if (sci_port->reg_size >= 0x20)
port->regshift = 2;
else
port->regshift = 1;
}
/*
* The UART port needs an IRQ value, so we peg this to the RX IRQ
* for the multi-IRQ ports, which is where we are primarily