diff options
author | Linus Walleij <linus.walleij@linaro.org> | 2012-05-23 19:18:46 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-12 22:41:44 (GMT) |
commit | 78d80c5a720ea370defa3e3124c0f7f7179bdfe5 (patch) | |
tree | 79821058633366fa9bca66038439dde67673680b | |
parent | f109293f5889dd30477564a3ce2c901f4024a53e (diff) | |
download | linux-fsl-qoriq-78d80c5a720ea370defa3e3124c0f7f7179bdfe5.tar.xz |
serial/amba-pl011: move custom pin control to driver
We had a boot regression in Ux500 in the merge window because
two orthogonal pin control schemes for the PL011 were merged
at the same time:
- One using the .init() and .exit() hooks into the platform
for Ux500 putting the pins into default vs sleep state
respectively as the port was started/stopped.
commit a09806607fd20bed2f8c41fe22793386790a14aa
"ARM: ux500: switch to using pinctrl for uart0"
- One hogging the default setting at PL011 probe()
commit 258e055111d3cde2607e0d04eb91da2f7a59b591
"serial: amba-pl011: adopt pinctrl support"
To get a solution that works for both let's scrap the stuff
in the platform callbacks, instead have the driver itself
select default and sleep states when the port is
started/stopped. Hopefully this works for all clients.
Platform callbacks are bad for device tree migration anyway,
so this rids us of another problem in Ux500.
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Reported-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | arch/arm/mach-ux500/board-mop500.c | 54 | ||||
-rw-r--r-- | drivers/tty/serial/amba-pl011.c | 45 |
2 files changed, 42 insertions, 57 deletions
diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c index 9c74ac5..1509a3c 100644 --- a/arch/arm/mach-ux500/board-mop500.c +++ b/arch/arm/mach-ux500/board-mop500.c @@ -580,43 +580,12 @@ static void ux500_uart0_reset(void) udelay(1); } -/* This needs to be referenced by callbacks */ -struct pinctrl *u0_p; -struct pinctrl_state *u0_def; -struct pinctrl_state *u0_sleep; - -static void ux500_uart0_init(void) -{ - int ret; - - if (IS_ERR(u0_p) || IS_ERR(u0_def)) - return; - - ret = pinctrl_select_state(u0_p, u0_def); - if (ret) - pr_err("could not set UART0 defstate\n"); -} - -static void ux500_uart0_exit(void) -{ - int ret; - - if (IS_ERR(u0_p) || IS_ERR(u0_sleep)) - return; - - ret = pinctrl_select_state(u0_p, u0_sleep); - if (ret) - pr_err("could not set UART0 idlestate\n"); -} - static struct amba_pl011_data uart0_plat = { #ifdef CONFIG_STE_DMA40 .dma_filter = stedma40_filter, .dma_rx_param = &uart0_dma_cfg_rx, .dma_tx_param = &uart0_dma_cfg_tx, #endif - .init = ux500_uart0_init, - .exit = ux500_uart0_exit, .reset = ux500_uart0_reset, }; @@ -638,28 +607,7 @@ static struct amba_pl011_data uart2_plat = { static void __init mop500_uart_init(struct device *parent) { - struct amba_device *uart0_device; - - uart0_device = db8500_add_uart0(parent, &uart0_plat); - if (uart0_device) { - u0_p = pinctrl_get(&uart0_device->dev); - if (IS_ERR(u0_p)) - dev_err(&uart0_device->dev, - "could not get UART0 pinctrl\n"); - else { - u0_def = pinctrl_lookup_state(u0_p, - PINCTRL_STATE_DEFAULT); - if (IS_ERR(u0_def)) { - dev_err(&uart0_device->dev, - "could not get UART0 defstate\n"); - } - u0_sleep = pinctrl_lookup_state(u0_p, - PINCTRL_STATE_SLEEP); - if (IS_ERR(u0_sleep)) - dev_err(&uart0_device->dev, - "could not get UART0 idlestate\n"); - } - } + db8500_add_uart0(parent, &uart0_plat); db8500_add_uart1(parent, &uart1_plat); db8500_add_uart2(parent, &uart2_plat); } diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 4ad721f..c17923e 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -133,6 +133,10 @@ struct pl011_dmatx_data { struct uart_amba_port { struct uart_port port; struct clk *clk; + /* Two optional pin states - default & sleep */ + struct pinctrl *pinctrl; + struct pinctrl_state *pins_default; + struct pinctrl_state *pins_sleep; const struct vendor_data *vendor; unsigned int dmacr; /* dma control reg */ unsigned int im; /* interrupt mask */ @@ -1312,6 +1316,14 @@ static int pl011_startup(struct uart_port *port) unsigned int cr; int retval; + /* Optionaly enable pins to be muxed in and configured */ + if (!IS_ERR(uap->pins_default)) { + retval = pinctrl_select_state(uap->pinctrl, uap->pins_default); + if (retval) + dev_err(port->dev, + "could not set default pins\n"); + } + retval = clk_prepare(uap->clk); if (retval) goto out; @@ -1420,6 +1432,7 @@ static void pl011_shutdown(struct uart_port *port) { struct uart_amba_port *uap = (struct uart_amba_port *)port; unsigned int cr; + int retval; /* * disable all interrupts @@ -1462,6 +1475,14 @@ static void pl011_shutdown(struct uart_port *port) */ clk_disable(uap->clk); clk_unprepare(uap->clk); + /* Optionally let pins go into sleep states */ + if (!IS_ERR(uap->pins_sleep)) { + retval = pinctrl_select_state(uap->pinctrl, uap->pins_sleep); + if (retval) + dev_err(port->dev, + "could not set pins to sleep state\n"); + } + if (uap->port.dev->platform_data) { struct amba_pl011_data *plat; @@ -1792,6 +1813,14 @@ static int __init pl011_console_setup(struct console *co, char *options) if (!uap) return -ENODEV; + /* Allow pins to be muxed in and configured */ + if (!IS_ERR(uap->pins_default)) { + ret = pinctrl_select_state(uap->pinctrl, uap->pins_default); + if (ret) + dev_err(uap->port.dev, + "could not set default pins\n"); + } + ret = clk_prepare(uap->clk); if (ret) return ret; @@ -1844,7 +1873,6 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) { struct uart_amba_port *uap; struct vendor_data *vendor = id->data; - struct pinctrl *pinctrl; void __iomem *base; int i, ret; @@ -1869,11 +1897,20 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) goto free; } - pinctrl = devm_pinctrl_get_select_default(&dev->dev); - if (IS_ERR(pinctrl)) { - ret = PTR_ERR(pinctrl); + uap->pinctrl = devm_pinctrl_get(&dev->dev); + if (IS_ERR(uap->pinctrl)) { + ret = PTR_ERR(uap->pinctrl); goto unmap; } + uap->pins_default = pinctrl_lookup_state(uap->pinctrl, + PINCTRL_STATE_DEFAULT); + if (IS_ERR(uap->pins_default)) + dev_err(&dev->dev, "could not get default pinstate\n"); + + uap->pins_sleep = pinctrl_lookup_state(uap->pinctrl, + PINCTRL_STATE_SLEEP); + if (IS_ERR(uap->pins_sleep)) + dev_dbg(&dev->dev, "could not get sleep pinstate\n"); uap->clk = clk_get(&dev->dev, NULL); if (IS_ERR(uap->clk)) { |