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ARM: bcm2835: SoC driver updates

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The bcm2835 clock driver is enhanced to allow fixed clocks to be probed
 from device tree.
 
 A system power-off implementation is added.
 
 This branch is based on v3.8-rc3.
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Merge tag 'bcm2835-for-3.9-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-rpi into next/soc

From Stephen Warren:
ARM: bcm2835: SoC driver updates

The bcm2835 clock driver is enhanced to allow fixed clocks to be probed
from device tree.

A system power-off implementation is added.

This branch is based on v3.8-rc3.

* tag 'bcm2835-for-3.9-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-rpi:
  ARM: bcm2835: add a pm_power_off implementation
  clk: bcm2835: probe for fixed-clock in device tree

Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Olof Johansson 2013-01-29 09:53:34 -08:00
parent 3d7b2c6087 45e9d77a22
commit 6ed05a2aab
2 changed files with 37 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
arch/arm/mach-bcm2835/bcm2835.c
View file

@ -26,11 +26,13 @@
#include <mach/bcm2835_soc.h>
#define PM_RSTC 0x1c
#define PM_RSTS 0x20
#define PM_WDOG 0x24
#define PM_PASSWORD 0x5a000000
#define PM_RSTC_WRCFG_MASK 0x00000030
#define PM_RSTC_WRCFG_FULL_RESET 0x00000020
#define PM_RSTS_HADWRH_SET 0x00000040
static void __iomem *wdt_regs;
@ -67,6 +69,29 @@ static void bcm2835_restart(char mode, const char *cmd)
mdelay(1);
}
/*
* We can't really power off, but if we do the normal reset scheme, and
* indicate to bootcode.bin not to reboot, then most of the chip will be
* powered off.
*/
static void bcm2835_power_off(void)
{
u32 val;
/*
* We set the watchdog hard reset bit here to distinguish this reset
* from the normal (full) reset. bootcode.bin will not reboot after a
* hard reset.
*/
val = readl_relaxed(wdt_regs + PM_RSTS);
val &= ~PM_RSTC_WRCFG_MASK;
val |= PM_PASSWORD | PM_RSTS_HADWRH_SET;
writel_relaxed(val, wdt_regs + PM_RSTS);
/* Continue with normal reset mechanism */
bcm2835_restart(0, "");
}
static struct map_desc io_map __initdata = {
.virtual = BCM2835_PERIPH_VIRT,
.pfn = __phys_to_pfn(BCM2835_PERIPH_PHYS),
@ -84,6 +109,9 @@ static void __init bcm2835_init(void)
int ret;
bcm2835_setup_restart();
if (wdt_regs)
pm_power_off = bcm2835_power_off;
bcm2835_init_clocks();
ret = of_platform_populate(NULL, of_default_bus_match_table, NULL,

9
drivers/clk/clk-bcm2835.c
View file

@ -20,6 +20,13 @@
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/bcm2835.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
static const __initconst struct of_device_id clk_match[] = {
{ .compatible = "fixed-clock", .data = of_fixed_clk_setup, },
{ }
};
/*
* These are fixed clocks. They're probably not all root clocks and it may
@ -56,4 +63,6 @@ void __init bcm2835_init_clocks(void)
ret = clk_register_clkdev(clk, NULL, "20215000.uart");
if (ret)
pr_err("uart1_pclk alias not registered\n");
of_clk_init(clk_match);
}