Use the mailbox driver to query the clock frequency and create a clkdev for the bcm2835_mci driver.
Signed-off-by: Andre Heider <[email protected]> --- arch/arm/boards/raspberry-pi/rpi.c | 40 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/arch/arm/boards/raspberry-pi/rpi.c b/arch/arm/boards/raspberry-pi/rpi.c index 971a603..d3c6b11 100644 --- a/arch/arm/boards/raspberry-pi/rpi.c +++ b/arch/arm/boards/raspberry-pi/rpi.c @@ -17,11 +17,44 @@ #include <init.h> #include <fs.h> #include <linux/stat.h> +#include <linux/clk.h> +#include <linux/clkdev.h> #include <envfs.h> #include <asm/armlinux.h> #include <generated/mach-types.h> #include <mach/core.h> +#include <mach/mbox.h> + +struct msg_get_clock_rate { + struct bcm2835_mbox_hdr hdr; + struct bcm2835_mbox_tag_get_clock_rate get_clock_rate; + u32 end_tag; +}; + +static int rpi_register_clkdev(u32 clock_id, const char *name) +{ + BCM2835_MBOX_STACK_ALIGN(struct msg_get_clock_rate, msg); + struct clk *clk; + int ret; + + BCM2835_MBOX_INIT_HDR(msg); + BCM2835_MBOX_INIT_TAG(&msg->get_clock_rate, GET_CLOCK_RATE); + msg->get_clock_rate.body.req.clock_id = clock_id; + + ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr); + if (ret) + return ret; + + clk = clk_fixed(name, msg->get_clock_rate.body.resp.rate_hz); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + if (!clk_register_clkdev(clk, NULL, name)) + return -ENODEV; + + return 0; +} static int rpi_mem_init(void) { @@ -40,6 +73,13 @@ static int rpi_console_init(void) } console_initcall(rpi_console_init); +static int rpi_clock_init(void) +{ + rpi_register_clkdev(BCM2835_MBOX_CLOCK_ID_EMMC, "bcm2835_mci0"); + return 0; +} +postconsole_initcall(rpi_clock_init); + static int rpi_env_init(void) { struct stat s; -- 1.8.3.2 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
