[PATCH v4 09/11] drivers: PL011: allow to supply fixed option string
From: andre.przywara@arm.com (Andre Przywara)
Date: 2015-05-12 14:14:53
Also in:
linux-serial
Subsystem:
arm primecell uart pl010 and pl011 drivers, the rest, tty layer and serial drivers · Maintainers:
Russell King, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
The SBSA UART has a fixed baud rate and flow control setting, which cannot be changed or queried by software. Add a vendor specific property to always return fixed values when trying to read the console options. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- drivers/tty/serial/amba-pl011.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index fe92289..70e2958 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c@@ -79,6 +79,7 @@ struct vendor_data { bool dma_threshold; bool cts_event_workaround; bool always_enabled; + bool fixed_options; unsigned int (*get_fifosize)(struct amba_device *dev); };
@@ -96,6 +97,7 @@ static struct vendor_data vendor_arm = { .dma_threshold = false, .cts_event_workaround = false, .always_enabled = false, + .fixed_options = false, .get_fifosize = get_fifosize_arm, };
@@ -112,6 +114,7 @@ static struct vendor_data vendor_st = { .dma_threshold = true, .cts_event_workaround = true, .always_enabled = false, + .fixed_options = false, .get_fifosize = get_fifosize_st, };
@@ -160,6 +163,7 @@ struct uart_amba_port { unsigned int lcrh_rx; /* vendor-specific */ unsigned int old_cr; /* state during shutdown */ bool autorts; + unsigned int fixed_baud; /* vendor-set fixed baud rate */ char type[12]; #ifdef CONFIG_DMA_ENGINE /* DMA stuff */
@@ -2076,10 +2080,15 @@ static int __init pl011_console_setup(struct console *co, char *options) uap->port.uartclk = clk_get_rate(uap->clk); - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - pl011_console_get_options(uap, &baud, &parity, &bits); + if (uap->vendor->fixed_options) { + baud = uap->fixed_baud; + } else { + if (options) + uart_parse_options(options, + &baud, &parity, &bits, &flow); + else + pl011_console_get_options(uap, &baud, &parity, &bits); + } return uart_set_options(&uap->port, co, baud, parity, bits, flow); }
--
2.3.5