提交 cf0ce095 编写于 作者: L Linus Walleij

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: NLinus Walleij <linus.walleij@linaro.org>
上级 be2885a5
......@@ -8,15 +8,39 @@ Required root node property:
compatible="stericsson,u300";
Required node: syscon
This contains the system controller.
- compatible: must be "stericsson,u300-syscon".
- reg: the base address and size of the system controller.
Boards with the U300 SoC include:
S365 "Small Board U365":
Required node: s365
This contains the board-specific information.
- compatible: must be "stericsson,s365".
- vana15-supply: the regulator supplying the 1.5V to drive the
board.
- syscon: a pointer to the syscon node so we can acccess the
syscon registers to set the board as self-powered.
Example:
s365 {
compatible = "stericsson,s365";
vana15-supply = <&ab3100_ldo_d_reg>;
/ {
model = "ST-Ericsson U300";
compatible = "stericsson,u300";
#address-cells = <1>;
#size-cells = <1>;
s365 {
compatible = "stericsson,s365";
vana15-supply = <&ab3100_ldo_d_reg>;
syscon = <&syscon>;
};
syscon: syscon@c0011000 {
compatible = "stericsson,u300-syscon";
reg = <0xc0011000 0x1000>;
};
};
......@@ -27,6 +27,12 @@
s365 {
compatible = "stericsson,s365";
vana15-supply = <&ab3100_ldo_d_reg>;
syscon = <&syscon>;
};
syscon: syscon@c0011000 {
compatible = "stericsson,u300-syscon";
reg = <0xc0011000 0x1000>;
};
timer: timer@c0014000 {
......
......@@ -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[] = {
......
......@@ -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;
......
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