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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm/mach-u300/regulator.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm/mach-u300/regulator.c')
-rw-r--r--kernel/arch/arm/mach-u300/regulator.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-u300/regulator.c b/kernel/arch/arm/mach-u300/regulator.c
new file mode 100644
index 000000000..595b574c2
--- /dev/null
+++ b/kernel/arch/arm/mach-u300/regulator.c
@@ -0,0 +1,132 @@
+/*
+ * arch/arm/mach-u300/regulator.c
+ *
+ * Copyright (C) 2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * Handle board-bound regulators and board power not related
+ * to any devices.
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+#include <linux/device.h>
+#include <linux/signal.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/consumer.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+/* Power Management Control 16bit (R/W) */
+#define U300_SYSCON_PMCR (0x50)
+#define U300_SYSCON_PMCR_DCON_ENABLE (0x0002)
+#define U300_SYSCON_PMCR_PWR_MGNT_ENABLE (0x0001)
+
+/*
+ * Regulators that power the board and chip and which are
+ * not copuled to specific drivers are hogged in these
+ * instances.
+ */
+static struct regulator *main_power_15;
+
+/*
+ * This function is used from pm.h to shut down the system by
+ * resetting all regulators in turn and then disable regulator
+ * LDO D (main power).
+ */
+void u300_pm_poweroff(void)
+{
+ sigset_t old, all;
+
+ sigfillset(&all);
+ if (!sigprocmask(SIG_BLOCK, &all, &old)) {
+ /* Disable LDO D to shut down the system */
+ if (main_power_15)
+ regulator_disable(main_power_15);
+ else
+ pr_err("regulator not available to shut down system\n");
+ (void) sigprocmask(SIG_SETMASK, &old, NULL);
+ }
+ return;
+}
+
+/*
+ * Hog the regulators needed to power up the board.
+ */
+static int __init __u300_init_boardpower(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *syscon_np;
+ struct regmap *regmap;
+ int err;
+
+ 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;
+ }
+ regmap = syscon_node_to_regmap(syscon_np);
+ if (IS_ERR(regmap)) {
+ pr_crit("U300: could not locate syscon regmap\n");
+ return PTR_ERR(regmap);
+ }
+
+ main_power_15 = regulator_get(&pdev->dev, "vana15");
+
+ if (IS_ERR(main_power_15)) {
+ pr_err("could not get vana15");
+ return PTR_ERR(main_power_15);
+ }
+ err = regulator_enable(main_power_15);
+ if (err) {
+ pr_err("could not enable vana15\n");
+ return err;
+ }
+
+ /*
+ * On U300 a special system controller register pulls up the DC
+ * until the vana15 (LDO D) regulator comes up. At this point, all
+ * regulators are set and we do not need power control via
+ * DC ON anymore. This function will likely be moved whenever
+ * the rest of the U300 power management is implemented.
+ */
+ pr_info("U300: disable system controller pull-up\n");
+ regmap_update_bits(regmap, U300_SYSCON_PMCR,
+ U300_SYSCON_PMCR_DCON_ENABLE, 0);
+
+ /* Register globally exported PM poweroff hook */
+ pm_power_off = u300_pm_poweroff;
+
+ return 0;
+}
+
+static int __init s365_board_probe(struct platform_device *pdev)
+{
+ return __u300_init_boardpower(pdev);
+}
+
+static const struct of_device_id s365_board_match[] = {
+ { .compatible = "stericsson,s365" },
+ {},
+};
+
+static struct platform_driver s365_board_driver = {
+ .driver = {
+ .name = "s365-board",
+ .of_match_table = s365_board_match,
+ },
+};
+
+/*
+ * So at module init time we hog the regulator!
+ */
+static int __init u300_init_boardpower(void)
+{
+ return platform_driver_probe(&s365_board_driver,
+ s365_board_probe);
+}
+
+device_initcall(u300_init_boardpower);