From 174b0da23199c4ae1ed06263dafd9a2e85e97d34 Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Mon, 3 Dec 2007 15:17:58 -0600 Subject: [PATCH] [POWERPC] qe: add function qe_clock_source() Add function qe_clock_source() which takes a string containing the name of a QE clock source (as is typically found in device trees) and returns the matching enum qe_clock value. Update booting-without-of.txt to indicate that the UCC properties rx-clock and tx-clock are deprecated and replaced with rx-clock-name and tx-clock-name, which use strings instead of numbers to indicate QE clock sources. Signed-off-by: Timur Tabi Signed-off-by: Kumar Gala --- Documentation/powerpc/booting-without-of.txt | 13 +++++++++++ arch/powerpc/sysdev/qe_lib/qe.c | 32 ++++++++++++++++++++++++++++ include/asm-powerpc/qe.h | 1 + 3 files changed, 46 insertions(+) diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt index c3fc9d95503..ee0209a7de3 100644 --- a/Documentation/powerpc/booting-without-of.txt +++ b/Documentation/powerpc/booting-without-of.txt @@ -1629,6 +1629,19 @@ platforms are moved over to use the flattened-device-tree model. - interrupt-parent : the phandle for the interrupt controller that services interrupts for this device. - pio-handle : The phandle for the Parallel I/O port configuration. + - rx-clock-name: the UCC receive clock source + "none": clock source is disabled + "brg1" through "brg16": clock source is BRG1-BRG16, respectively + "clk1" through "clk24": clock source is CLK1-CLK24, respectively + - tx-clock-name: the UCC transmit clock source + "none": clock source is disabled + "brg1" through "brg16": clock source is BRG1-BRG16, respectively + "clk1" through "clk24": clock source is CLK1-CLK24, respectively + The following two properties are deprecated. rx-clock has been replaced + with rx-clock-name, and tx-clock has been replaced with tx-clock-name. + Drivers that currently use the deprecated properties should continue to + do so, in order to support older device trees, but they should be updated + to check for the new properties first. - rx-clock : represents the UCC receive clock source. 0x00 : clock source is disabled; 0x1~0x10 : clock source is BRG1~BRG16 respectively; diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c index 1df3b4a6832..21e01061aca 100644 --- a/arch/powerpc/sysdev/qe_lib/qe.c +++ b/arch/powerpc/sysdev/qe_lib/qe.c @@ -203,6 +203,38 @@ int qe_setbrg(enum qe_clock brg, unsigned int rate, unsigned int multiplier) } EXPORT_SYMBOL(qe_setbrg); +/* Convert a string to a QE clock source enum + * + * This function takes a string, typically from a property in the device + * tree, and returns the corresponding "enum qe_clock" value. +*/ +enum qe_clock qe_clock_source(const char *source) +{ + unsigned int i; + + if (strcasecmp(source, "none") == 0) + return QE_CLK_NONE; + + if (strncasecmp(source, "brg", 3) == 0) { + i = simple_strtoul(source + 3, NULL, 10); + if ((i >= 1) && (i <= 16)) + return (QE_BRG1 - 1) + i; + else + return QE_CLK_DUMMY; + } + + if (strncasecmp(source, "clk", 3) == 0) { + i = simple_strtoul(source + 3, NULL, 10); + if ((i >= 1) && (i <= 24)) + return (QE_CLK1 - 1) + i; + else + return QE_CLK_DUMMY; + } + + return QE_CLK_DUMMY; +} +EXPORT_SYMBOL(qe_clock_source); + /* Initialize SNUMs (thread serial numbers) according to * QE Module Control chapter, SNUM table */ diff --git a/include/asm-powerpc/qe.h b/include/asm-powerpc/qe.h index bcf60bef652..a24b7b14958 100644 --- a/include/asm-powerpc/qe.h +++ b/include/asm-powerpc/qe.h @@ -84,6 +84,7 @@ extern int par_io_data_set(u8 port, u8 pin, u8 val); /* QE internal API */ int qe_issue_cmd(u32 cmd, u32 device, u8 mcn_protocol, u32 cmd_input); +enum qe_clock qe_clock_source(const char *source); int qe_setbrg(enum qe_clock brg, unsigned int rate, unsigned int multiplier); int qe_get_snum(void); void qe_put_snum(u8 snum); -- 2.11.4.GIT