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authorLinus Walleij <linus.walleij@linaro.org>2013-05-22 16:15:13 +0200
committerLinus Walleij <linus.walleij@linaro.org>2013-06-17 13:54:35 +0200
commitcf0ce095c932becf48ed794ecdfad925e931dc9c (patch)
tree107d791b310c669c79d44d084323a9817f521eda /arch/arm/mach-u300
parentbe2885a569f43fa6c44e2a5e1795583ae9941c27 (diff)
ARM: u300: add syscon node
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>
Diffstat (limited to 'arch/arm/mach-u300')
-rw-r--r--arch/arm/mach-u300/core.c22
-rw-r--r--arch/arm/mach-u300/regulator.c21
2 files changed, 36 insertions, 7 deletions
diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
index 1fdaf81771f..8cfca45d365 100644
--- a/arch/arm/mach-u300/core.c
+++ b/arch/arm/mach-u300/core.c
@@ -14,6 +14,7 @@
#include <linux/platform_data/clk-u300.h>
#include <linux/platform_data/pinctrl-coh901.h>
#include <linux/irqchip.h>
+#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/clocksource.h>
#include <linux/clk.h>
@@ -48,6 +49,8 @@
#define U300_SYSCON_BCR_EXTRA_BOOT_OPTION_MASK (0x01FC)
#define U300_SYSCON_BCR_APP_BOOT_SERV_MASK (0x0003)
+static void __iomem *syscon_base;
+
/*
* Static I/O mappings that are needed for booting the U300 platforms. The
* only things we need are the areas where we find the timer, syscon and
@@ -171,7 +174,7 @@ static void __init u300_init_check_chip(void)
const char unknown[] = "UNKNOWN";
/* Read out and print chip ID */
- val = readw(U300_SYSCON_VBASE + U300_SYSCON_CIDR);
+ val = readw(syscon_base + U300_SYSCON_CIDR);
/* This is in funky bigendian order... */
val = (val & 0xFFU) << 8 | (val >> 8);
chip = db_chips;
@@ -244,10 +247,21 @@ static struct of_dev_auxdata u300_auxdata_lookup[] __initdata = {
static void __init u300_init_irq_dt(void)
{
+ struct device_node *syscon;
struct clk *clk;
+ syscon = of_find_node_by_path("/syscon@c0011000");
+ if (!syscon) {
+ pr_crit("could not find syscon node\n");
+ return;
+ }
+ syscon_base = of_iomap(syscon, 0);
+ if (!syscon_base) {
+ pr_crit("could not remap syscon\n");
+ return;
+ }
/* initialize clocking early, we want to clock the INTCON */
- u300_clk_init(U300_SYSCON_VBASE);
+ u300_clk_init(syscon_base);
/* Bootstrap EMIF and SEMI clocks */
clk = clk_get_sys("pl172", NULL);
@@ -280,9 +294,9 @@ static void __init u300_init_machine_dt(void)
u300_auxdata_lookup, NULL);
/* Enable SEMI self refresh */
- val = readw(U300_SYSCON_VBASE + U300_SYSCON_SMCR) |
+ val = readw(syscon_base + U300_SYSCON_SMCR) |
U300_SYSCON_SMCR_SEMI_SREFREQ_ENABLE;
- writew(val, U300_SYSCON_VBASE + U300_SYSCON_SMCR);
+ writew(val, syscon_base + U300_SYSCON_SMCR);
}
static const char * u300_board_compat[] = {
diff --git a/arch/arm/mach-u300/regulator.c b/arch/arm/mach-u300/regulator.c
index 1cbe88c7436..273fceb8368 100644
--- a/arch/arm/mach-u300/regulator.c
+++ b/arch/arm/mach-u300/regulator.c
@@ -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;