diff options
| author | Manuel Lauss <manuel.lauss@googlemail.com> | 2010-09-25 15:13:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:20:09 -0700 |
| commit | 7d172bfefb72a8dae56beff326299c5e21f6f6db (patch) | |
| tree | 73cddae39798d6f3878b371a50db72c1c5d04b8a /arch/mips/alchemy/common/platform.c | |
| parent | c161afe9759ddcc174d08e7c4f683d08ac9ba86f (diff) | |
Alchemy: Add UART PM methods.
Custom UART PM hook for Alchemy chips: do standard UART pm and
additionally en/disable uart block clocks as needed.
This allows to get rid of a debug port PM hack in the Alchemy pm code.
Tested on Db1200.
Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/mips/alchemy/common/platform.c')
| -rw-r--r-- | arch/mips/alchemy/common/platform.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/platform.c b/arch/mips/alchemy/common/platform.c index 1dc55ee2681b..3691630931d6 100644 --- a/arch/mips/alchemy/common/platform.c +++ b/arch/mips/alchemy/common/platform.c @@ -24,6 +24,33 @@ #include <prom.h> +static void alchemy_8250_pm(struct uart_port *port, unsigned int state, + unsigned int old_state) +{ + switch (state) { + case 0: + if ((__raw_readl(port->membase + UART_MOD_CNTRL) & 3) != 3) { + /* power-on sequence as suggested in the databooks */ + __raw_writel(0, port->membase + UART_MOD_CNTRL); + wmb(); + __raw_writel(1, port->membase + UART_MOD_CNTRL); + wmb(); + } + __raw_writel(3, port->membase + UART_MOD_CNTRL); /* full on */ + wmb(); + serial8250_do_pm(port, state, old_state); + break; + case 3: /* power off */ + serial8250_do_pm(port, state, old_state); + __raw_writel(0, port->membase + UART_MOD_CNTRL); + wmb(); + break; + default: + serial8250_do_pm(port, state, old_state); + break; + } +} + #define PORT(_base, _irq) \ { \ .mapbase = _base, \ @@ -33,6 +60,7 @@ .flags = UPF_SKIP_TEST | UPF_IOREMAP | \ UPF_FIXED_TYPE, \ .type = PORT_16550A, \ + .pm = alchemy_8250_pm, \ } static struct plat_serial8250_port au1x00_uart_data[] = { |