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ARM: u300: add syscon node

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This adds a device tree node for the U300 system controller
and remaps this dynamically instead of using hard-coded
virtual addresses. The board power set-up code is altered
to fetch a reference to the syscon using ampersand <&syscon>
notation. This way of passing a pointer to the syscon will
also be used by the clocks.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij
2013-05-22 16:15:13 +02:00
parent be2885a569
commit cf0ce095c9
4 changed files with 69 additions and 10 deletions
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21
arch/arm/mach-u300/regulator.c
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@@ -16,8 +16,8 @@
#include <linux/regulator/machine.h>
#include <linux/regulator/consumer.h>
/* Those are just for writing in syscon */
#include <linux/of_address.h>
#include <linux/io.h>
#include "u300-regs.h"
/* Power Management Control 16bit (R/W) */
#define U300_SYSCON_PMCR (0x50)
@@ -57,10 +57,25 @@ void u300_pm_poweroff(void)
*/
static int __init __u300_init_boardpower(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *syscon_np;
static void __iomem *syscon_base;
int err;
u32 val;
pr_info("U300: setting up board power\n");
syscon_np = of_parse_phandle(np, "syscon", 0);
if (!syscon_np) {
pr_crit("U300: no syscon node\n");
return -ENODEV;
}
syscon_base = of_iomap(syscon_np, 0);
if (!syscon_base) {
pr_crit("U300: could not remap syscon\n");
return -ENODEV;
}
main_power_15 = regulator_get(&pdev->dev, "vana15");
if (IS_ERR(main_power_15)) {
@@ -81,9 +96,9 @@ static int __init __u300_init_boardpower(struct platform_device *pdev)
* the rest of the U300 power management is implemented.
*/
pr_info("U300: disable system controller pull-up\n");
val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
val = readw(syscon_base + U300_SYSCON_PMCR);
val &= ~U300_SYSCON_PMCR_DCON_ENABLE;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
writew(val, syscon_base + U300_SYSCON_PMCR);
/* Register globally exported PM poweroff hook */
pm_power_off = u300_pm_poweroff;