From 120aec0902663d2ed942c1542217791c46b8e406 Mon Sep 17 00:00:00 2001 From: Julius Werner Date: Wed, 22 Oct 2014 14:12:50 -0700 Subject: serial: Combine Tegra and Rockchip UARTs to generic 8250_mmio32 We have two drivers for a 100%-identical peripheral right now, mostly because we couldn't come up with a good common name for it back when we checked it in. That seems like a pretty silly reason in the long run. Both Tegra and Rockchip SoCs contain UARTs that use the common 8250 register interface (at least for the very basic byte-per-byte transmit and receive parts we care about), memory-mapped with a 32-bit register stride. This patch combines them to a single 8250_mmio32 driver (which also fixes a problem when booting Rockchip without serial enabled, since that driver forgot to check for serial initialization when registering its console drivers). The register accesses are done using readl/writel (as Rockchip did before), since the registers are documented as 32-bit length (with top 24 bits RAZ/WI), although the Tegra SoC doesn't enforce APB accesses to have the full word length. Also fixed checkpatch stuff. A day may come when we can also merge this driver into the (completely different, with more complicated features and #ifdefs) 8250 driver for x86 (which has MMIO support for 8-bit register stride only), both here and in coreboot. But it is not this day. This day I just want to get rid of a 99% identical file without expending too much effort. BUG=None TEST=Booted on Veyron_Pinky and Nyan_Blaze with and without serial enabled, both worked fine (although Veyron has another kernel issue). Change-Id: I85c004a75cc5aa7cb40098002d3e00a62c1c5f2d Signed-off-by: Patrick Georgi Original-Commit-Id: e7959c19356d2922aa414866016540ad9ee2ffa8 Original-Change-Id: Ib84d00f52ff2c48398c75f77f6a245e658ffdeb9 Original-Signed-off-by: Julius Werner Original-Reviewed-on: https://chromium-review.googlesource.com/225102 Original-Reviewed-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/9387 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- payloads/libpayload/Config.in | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) (limited to 'payloads/libpayload/Config.in') diff --git a/payloads/libpayload/Config.in b/payloads/libpayload/Config.in index cb1d529402..2efd5d673c 100644 --- a/payloads/libpayload/Config.in +++ b/payloads/libpayload/Config.in @@ -199,13 +199,8 @@ config S5P_SERIAL_CONSOLE depends on SERIAL_CONSOLE default n -config TEGRA_SERIAL_CONSOLE - bool "Tegra SOC compatible serial port driver" - depends on SERIAL_CONSOLE - default n - -config RK_SERIAL_CONSOLE - bool "Rockchip SOC serial port driver" +config 8250_MMIO32_SERIAL_CONSOLE + bool "Memory-mapped 8250-compatible serial port driver with 32-bit regs" depends on SERIAL_CONSOLE default n -- cgit v1.2.3