From: Thierry Reding <treding@xxxxxxxxxx>
The PM domains are populated from DT, and the PM domain consumer devices are
also bound to their relevant PM domains by DT.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
[vinceh: make changes based on Thierry and Peter's suggestions]
Signed-off-by: Vince Hsu <vinceh@xxxxxxxxxx>
---
v2: revise comment in tegra_powergate_remove_clamping()
address Alex's comments
drivers/soc/tegra/pmc.c | 589 +++++++++++++++++++++++++++-
include/dt-bindings/power/tegra-powergate.h | 30 ++
2 files changed, 617 insertions(+), 2 deletions(-)
create mode 100644 include/dt-bindings/power/tegra-powergate.h
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index c956395cf46f..ed1ce06e3635 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -27,15 +27,20 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
#include <linux/reboot.h>
+#include <linux/regulator/consumer.h>
#include <linux/reset.h>
+#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <soc/tegra/common.h>
#include <soc/tegra/fuse.h>
+#include <soc/tegra/mc.h>
#include <soc/tegra/pmc.h>
#define PMC_CNTRL 0x0
@@ -99,6 +104,30 @@
#define GPU_RG_CNTRL 0x2d4
+#define MAX_CLK_NUM 5
+#define MAX_RESET_NUM 5
+#define MAX_SWGROUP_NUM 5
+
+struct tegra_powergate {
+ struct generic_pm_domain base;
+ struct tegra_pmc *pmc;
+ unsigned int id;
+ const char *name;
+ struct list_head head;
+ struct device_node *of_node;
+ struct clk *clk[MAX_CLK_NUM];
+ struct reset_control *reset[MAX_RESET_NUM];
+ struct tegra_mc_swgroup *swgroup[MAX_SWGROUP_NUM];
+ bool is_vdd;
+ struct regulator *vdd;
+};
+
+static inline struct tegra_powergate *
+to_powergate(struct generic_pm_domain *domain)
+{
+ return container_of(domain, struct tegra_powergate, base);
+}
+
struct tegra_pmc_soc {
unsigned int num_powergates;
const char *const *powergates;
@@ -107,12 +136,15 @@ struct tegra_pmc_soc {
bool has_tsense_reset;
bool has_gpu_clamps;
+ bool is_legacy_powergate;
};
/**
* struct tegra_pmc - NVIDIA Tegra PMC
+ * @dev: pointer to parent device
* @base: pointer to I/O remapped register region
* @clk: pointer to pclk clock
+ * @soc: SoC-specific data
* @rate: currently configured rate of pclk
* @suspend_mode: lowest suspend mode available
* @cpu_good_time: CPU power good time (in microseconds)
@@ -126,7 +158,9 @@ struct tegra_pmc_soc {
* @cpu_pwr_good_en: CPU power good signal is enabled
* @lp0_vec_phys: physical base address of the LP0 warm boot code
* @lp0_vec_size: size of the LP0 warm boot code
+ * @powergates: list of power gates
* @powergates_lock: mutex for power gate register access
+ * @nb: bus notifier for generic power domains
*/
struct tegra_pmc {
struct device *dev;
@@ -150,7 +184,12 @@ struct tegra_pmc {
u32 lp0_vec_phys;
u32 lp0_vec_size;
+ struct tegra_powergate *powergates;
struct mutex powergates_lock;
+ struct notifier_block nb;
+
+ struct list_head powergate_list;
+ int power_domain_num;
};
static struct tegra_pmc *pmc = &(struct tegra_pmc) {
@@ -236,6 +275,8 @@ int tegra_powergate_is_powered(int id)
/**
* tegra_powergate_remove_clamping() - remove power clamps for partition
* @id: partition ID
+ *
+ * TODO: make this function static once we get rid of all outside callers
*/
int tegra_powergate_remove_clamping(int id)
{
@@ -256,8 +297,8 @@ int tegra_powergate_remove_clamping(int id)
}
/*
- * Tegra 2 has a bug where PCIE and VDE clamping masks are
- * swapped relatively to the partition ids
+ * PCIE and VDE clamping bits are swapped relatively to the partition
+ * ids
*/
if (id == TEGRA_POWERGATE_VDEC)
mask = (1 << TEGRA_POWERGATE_PCIE);
@@ -373,6 +414,8 @@ int tegra_pmc_cpu_remove_clamping(int cpuid)
if (id < 0)
return id;
+ usleep_range(10, 20);
+
return tegra_powergate_remove_clamping(id);
}
#endif /* CONFIG_SMP */
@@ -407,6 +450,307 @@ void tegra_pmc_restart(enum reboot_mode mode, const char *cmd)
tegra_pmc_writel(value, 0);
}
+static bool tegra_pmc_powergate_is_powered(struct tegra_powergate *powergate)
+{
+ u32 status = tegra_pmc_readl(PWRGATE_STATUS);
+
+ if (!powergate->is_vdd)
+ return (status & BIT(powergate->id)) != 0;
+
+ if (IS_ERR(powergate->vdd))
+ return false;
+ else
+ return regulator_is_enabled(powergate->vdd);
+}
+
+static int tegra_pmc_powergate_set(struct tegra_powergate *powergate,
+ bool new_state)
+{
+ u32 status, mask = new_state ? BIT(powergate->id) : 0;
+ bool state = false;
+ unsigned long timeout;
+ int err = -ETIMEDOUT;
+
+
+ mutex_lock(&pmc->powergates_lock);
+
+ /* check the current state of the partition */
+ status = tegra_pmc_readl(PWRGATE_STATUS);
+ state = !!(status & BIT(powergate->id));
+
+ /* nothing to do */
+ if (new_state == state) {
+ mutex_unlock(&pmc->powergates_lock);
+ return 0;
+ }
+
+ /* toggle partition state and wait for state change to finish */
+ tegra_pmc_writel(PWRGATE_TOGGLE_START | powergate->id, PWRGATE_TOGGLE);
+
+ timeout = jiffies + msecs_to_jiffies(50);
+ while (time_before(jiffies, timeout)) {
+ status = tegra_pmc_readl(PWRGATE_STATUS);
+ if ((status & BIT(powergate->id)) == mask) {
+ err = 0;
+ break;
+ }
+
+ usleep_range(10, 20);
+ }
+
+ mutex_unlock(&pmc->powergates_lock);
+
+ return err;
+}
+
+static int tegra_pmc_powergate_enable_clocks(
+ struct tegra_powergate *powergate)
+{
+ int i, err;
+
+ for (i = 0; i < MAX_CLK_NUM; i++) {
+ if (!powergate->clk[i])
+ break;
+
+ err = clk_prepare_enable(powergate->clk[i]);
+ if (err)
+ goto out;
+ }
+
+ return 0;
+
+out:
+ while (i--)
+ clk_disable_unprepare(powergate->clk[i]);
+ return err;
+}
+
+static void tegra_pmc_powergate_disable_clocks(
+ struct tegra_powergate *powergate)
+{
+ int i;
+
+ for (i = 0; i < MAX_CLK_NUM; i++) {
+ if (!powergate->clk[i])
+ break;
+
+ clk_disable_unprepare(powergate->clk[i]);
+ }
+}
+
+static int tegra_pmc_powergate_mc_flush(struct tegra_powergate *powergate)
+{
+ int i, err;
+
+ for (i = 0; i < MAX_SWGROUP_NUM; i++) {
+ if (!powergate->swgroup[i])
+ break;
+
+ err = tegra_mc_flush(powergate->swgroup[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int tegra_pmc_powergate_mc_flush_done(struct tegra_powergate *powergate)
+{
+ int i, err;
+
+ for (i = 0; i < MAX_SWGROUP_NUM; i++) {
+ if (!powergate->swgroup[i])
+ break;
+
+ err = tegra_mc_flush_done(powergate->swgroup[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+
+}
+
+static int tegra_pmc_powergate_reset_assert(
+ struct tegra_powergate *powergate)
+{
+ int i, err;
+
+ for (i = 0; i < MAX_RESET_NUM; i++) {
+ if (!powergate->reset[i])
+ break;
+
+ err = reset_control_assert(powergate->reset[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int tegra_pmc_powergate_reset_deassert(
+ struct tegra_powergate *powergate)
+{
+ int i, err;
+
+ for (i = 0; i < MAX_RESET_NUM; i++) {
+ if (!powergate->reset[i])
+ break;
+
+ err = reset_control_deassert(powergate->reset[i]);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int tegra_powergate_get_regulator(struct tegra_powergate *powergate)
+{
+ struct platform_device *pdev;
+
+ if (!powergate->is_vdd)
+ return -EINVAL;
+
+ if (powergate->vdd && !IS_ERR(powergate->vdd))
+ return 0;
+
+ pdev = of_find_device_by_node(powergate->of_node);
+ if (!pdev)
+ return -EINVAL;
+
+ powergate->vdd = devm_regulator_get_optional(&pdev->dev, "vdd");
+ if (IS_ERR(powergate->vdd))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int tegra_pmc_powergate_power_on(struct generic_pm_domain *domain)
+{
+ struct tegra_powergate *powergate = to_powergate(domain);
+ struct tegra_pmc *pmc = powergate->pmc;
+ int err;
+
+ dev_dbg(pmc->dev, "> %s(domain=%p)\n", __func__, domain);
+ dev_dbg(pmc->dev, " name: %s\n", domain->name);
+
+ if (powergate->is_vdd) {
+ err = tegra_powergate_get_regulator(powergate);
+ if (!err)
+ err = regulator_enable(powergate->vdd);
+ } else {
+ err = tegra_pmc_powergate_set(powergate, true);
+ }
+ if (err < 0)
+ goto out;
+ udelay(10);
+
+ if (pmc->soc->is_legacy_powergate) {
+ err = tegra_pmc_powergate_reset_assert(powergate);
+ if (err)
+ goto out;
+ udelay(10);
+ }
+
+ /*
+ * Some PCIe PLLs depend on external power supplies, and the power
+ * supplies are enabled in driver. So we don't touch PCIe clocks
+ * here. Refer to:
+ * Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
+ */
+ if (powergate->id != TEGRA_POWERGATE_PCIE) {
+ err = tegra_pmc_powergate_enable_clocks(powergate);
+ if (err)
+ goto out;
+ udelay(10);
+ }
+
+ err = tegra_powergate_remove_clamping(powergate->id);
+ if (err)
+ goto out;
+ udelay(10);
+
+ err = tegra_pmc_powergate_reset_deassert(powergate);
+ if (err)
+ goto out;
+ udelay(10);
+
+ err = tegra_pmc_powergate_mc_flush_done(powergate);
+ if (err)
+ goto out;
+ udelay(10);
+
+ if (powergate->id != TEGRA_POWERGATE_PCIE)
+ tegra_pmc_powergate_disable_clocks(powergate);
+
+ return 0;
+
+out:
+ dev_dbg(pmc->dev, "< %s() = %d\n", __func__, err);
+ return err;
+}
+
+static int tegra_pmc_powergate_power_off(struct generic_pm_domain *domain)
+{
+ struct tegra_powergate *powergate = to_powergate(domain);
+ struct tegra_pmc *pmc = powergate->pmc;
+ int err;
+
+ dev_dbg(pmc->dev, "> %s(domain=%p)\n", __func__, domain);
+ dev_dbg(pmc->dev, " name: %s\n", domain->name);
+
+ /* never turn off these partitions */
+ switch (powergate->id) {
+ case TEGRA_POWERGATE_CPU:
+ case TEGRA_POWERGATE_CPU1:
+ case TEGRA_POWERGATE_CPU2:
+ case TEGRA_POWERGATE_CPU3:
+ case TEGRA_POWERGATE_CPU0:
+ case TEGRA_POWERGATE_C0NC:
+ case TEGRA_POWERGATE_IRAM:
+ dev_dbg(pmc->dev, "not disabling always-on partition %s\n",
+ domain->name);
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (!pmc->soc->is_legacy_powergate) {
+ err = tegra_pmc_powergate_enable_clocks(powergate);
+ if (err)
+ goto out;
+ udelay(10);
+
+ err = tegra_pmc_powergate_mc_flush(powergate);
+ if (err)
+ goto out;
+ udelay(10);
+ }
+
+ err = tegra_pmc_powergate_reset_assert(powergate);
+ if (err)
+ goto out;
+ udelay(10);
+
+ if (!pmc->soc->is_legacy_powergate) {
+ tegra_pmc_powergate_disable_clocks(powergate);
+ udelay(10);
+ }
+
+ if (powergate->vdd)
+ err = regulator_disable(powergate->vdd);
+ else
+ err = tegra_pmc_powergate_set(powergate, false);
+ if (err)
+ goto out;
+
+ return 0;
+
+out:
+ dev_dbg(pmc->dev, "< %s() = %d\n", __func__, err);
+ return err;
+}
+
static int powergate_show(struct seq_file *s, void *data)
{
unsigned int i;
@@ -449,6 +793,234 @@ static int tegra_powergate_debugfs_init(void)
return 0;
}
+static struct generic_pm_domain *
+tegra_powergate_of_xlate(struct of_phandle_args *args, void *data)
+{
+ struct tegra_pmc *pmc = data;
+ struct tegra_powergate *powergate;
+
+ dev_dbg(pmc->dev, "> %s(args=%p, data=%p)\n", __func__, args, data);
+
+ list_for_each_entry(powergate, &pmc->powergate_list, head) {
+ if (!powergate->base.name)
+ continue;
+
+ if (powergate->id == args->args[0]) {
+ dev_dbg(pmc->dev, "< %s() = %p\n", __func__, powergate);
+ return &powergate->base;
+ }
+ }
+
+ dev_dbg(pmc->dev, "< %s() = -ENOENT\n", __func__);
+ return ERR_PTR(-ENOENT);
+}
+
+static int tegra_powergate_of_get_clks(struct tegra_powergate *powergate)
+{
+ struct clk *clk;
+ int i, err;
+
+ for (i = 0; i < MAX_CLK_NUM; i++) {
+ clk = of_clk_get(powergate->of_node, i);
+ if (IS_ERR(clk)) {
+ if (PTR_ERR(clk) == -ENOENT)
+ break;
+ else
+ goto err_clks;
+ }
+
+ powergate->clk[i] = clk;
+ }
+
+ return 0;
+
+err_clks:
+ err = PTR_ERR(clk);
+ while (--i >= 0)
+ clk_put(powergate->clk[i]);
+ return err;
+}
+
+static int tegra_powergate_of_get_resets(struct tegra_powergate *powergate)
+{
+ struct reset_control *reset;
+ int i;
+
+ for (i = 0; i < MAX_RESET_NUM; i++) {
+ reset = of_reset_control_get_by_index(powergate->of_node, i);
+ if (IS_ERR(reset)) {
+ if (PTR_ERR(reset) == -ENOENT)
+ break;
+ else
+ return PTR_ERR(reset);
+ }
+
+ powergate->reset[i] = reset;
+ }
+
+ return 0;
+}
+
+static int tegra_powergate_of_get_swgroups(struct tegra_powergate *powergate)
+{
+ struct tegra_mc_swgroup *sg;
+ int i;
+
+ for (i = 0; i < MAX_SWGROUP_NUM; i++) {
+ sg = tegra_mc_find_swgroup(powergate->of_node, i);
+ if (IS_ERR_OR_NULL(sg)) {
+ if (PTR_ERR(sg) == -ENOENT)
+ break;
+ else
+ return -EINVAL;
+ }
+
+ powergate->swgroup[i] = sg;
+ }
+
+ return 0;
+}
+
+static int tegra_pmc_powergate_init_powerdomain(struct tegra_pmc *pmc)
+{
+ struct device_node *np;
+
+ for_each_compatible_node(np, NULL, "nvidia,power-domains") {
+ struct tegra_powergate *powergate;
+ const char *name;
+ int err;
+ u32 id;
+ bool off;
+
+ err = of_property_read_string(np, "name", &name);
+ if (err) {
+ dev_err(pmc->dev, "no significant name for domain\n");
+ return err;
+ }
+
+ err = of_property_read_u32(np, "domain", &id);
+ if (err) {
+ dev_err(pmc->dev, "no powergate ID for domain\n");
+ return err;
+ }
+
+ powergate = devm_kzalloc(pmc->dev, sizeof(*powergate),
+ GFP_KERNEL);
+ if (!powergate) {
+ dev_err(pmc->dev, "failed to allocate memory for domain %s\n",
+ name);
+ return -ENOMEM;
+ }
+
+ if (of_property_read_bool(np, "external-power-rail")) {
+ powergate->is_vdd = true;
+ err = tegra_powergate_get_regulator(powergate);
+ if (err) {
+ /*
+ * The regulator might not be ready yet, so just
+ * give a warning instead of failing the whole
+ * init.
+ */
+ dev_warn(pmc->dev, "couldn't locate regulator\n");
+ }
+ }
+
+ powergate->of_node = np;
+ powergate->name = name;
+ powergate->id = id;
+ powergate->base.name = kstrdup(powergate->name, GFP_KERNEL);
+ powergate->base.power_off = tegra_pmc_powergate_power_off;
+ powergate->base.power_on = tegra_pmc_powergate_power_on;
+ powergate->pmc = pmc;
+
+ err = tegra_powergate_of_get_clks(powergate);
+ if (err)
+ return err;
+
+ err = tegra_powergate_of_get_resets(powergate);
+ if (err)
+ return err;
+
+ err = tegra_powergate_of_get_swgroups(powergate);
+ if (err)
+ return err;
+
+ list_add_tail(&powergate->head, &pmc->powergate_list);
+
+ if ((powergate->is_vdd && !IS_ERR(powergate->vdd)) ||
+ !powergate->is_vdd)
+ tegra_pmc_powergate_power_off(&powergate->base);
+
+ off = !tegra_pmc_powergate_is_powered(powergate);
+ pm_genpd_init(&powergate->base, NULL, off);
+
+ pmc->power_domain_num++;
+
+ dev_info(pmc->dev, "added power domain %s\n", powergate->name);
+ }
+
+ dev_info(pmc->dev, "%d power domains added\n", pmc->power_domain_num);
+ return 0;
+}
+
+static int tegra_pmc_powergate_init_subdomain(struct tegra_pmc *pmc)
+{
+ struct tegra_powergate *powergate;
+
+ list_for_each_entry(powergate, &pmc->powergate_list, head) {
+ struct device_node *pdn;
+ struct tegra_powergate *parent = NULL;
+ struct tegra_powergate *temp;
+ int err;
+
+ pdn = of_parse_phandle(powergate->of_node, "depend-on", 0);
+ if (!pdn)
+ continue;
+
+ list_for_each_entry(temp, &pmc->powergate_list, head) {
+ if (temp->of_node == pdn) {
+ parent = temp;
+ break;
+ }
+ }
+
+ if (!parent)
+ return -EINVAL;
+
+ err = pm_genpd_add_subdomain_names(parent->name,
+ powergate->name);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int tegra_powergate_init(struct tegra_pmc *pmc)
+{
+ struct device_node *np = pmc->dev->of_node;
+ int err = 0;
+
+ dev_dbg(pmc->dev, "> %s(pmc=%p)\n", __func__, pmc);
+
+ INIT_LIST_HEAD(&pmc->powergate_list);
+ err = tegra_pmc_powergate_init_powerdomain(pmc);
+ if (err)
+ goto out;
+
+ err = tegra_pmc_powergate_init_subdomain(pmc);
+ if (err < 0)
+ return err;
+
+ err = __of_genpd_add_provider(np, tegra_powergate_of_xlate, pmc);
+ if (err < 0)
+ return err;
+
+out:
+ dev_dbg(pmc->dev, "< %s() = %d\n", __func__, err);
+ return err;
+}
+
static int tegra_io_rail_prepare(int id, unsigned long *request,
unsigned long *status, unsigned int *bit)
{
@@ -806,6 +1378,8 @@ static int tegra_pmc_probe(struct platform_device *pdev)
struct resource *res;
int err;
+ dev_dbg(&pdev->dev, "> %s(pdev=%p)\n", __func__, pdev);
+
err = tegra_pmc_parse_dt(pmc, pdev->dev.of_node);
if (err < 0)
return err;
@@ -831,12 +1405,19 @@ static int tegra_pmc_probe(struct platform_device *pdev)
tegra_pmc_init_tsense_reset(pmc);
+ if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
+ err = tegra_powergate_init(pmc);
+ if (err < 0)
+ return err;
+ }
+
if (IS_ENABLED(CONFIG_DEBUG_FS)) {
err = tegra_powergate_debugfs_init();
if (err < 0)
return err;
}
+ dev_dbg(&pdev->dev, "< %s()\n", __func__);
return 0;
}
@@ -876,6 +1457,7 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = {
.cpu_powergates = NULL,
.has_tsense_reset = false,
.has_gpu_clamps = false,
+ .is_legacy_powergate = true,
};
static const char * const tegra30_powergates[] = {
@@ -909,6 +1491,7 @@ static const struct tegra_pmc_soc tegra30_pmc_soc = {
.cpu_powergates = tegra30_cpu_powergates,
.has_tsense_reset = true,
.has_gpu_clamps = false,
+ .is_legacy_powergate = true,
};
static const char * const tegra114_powergates[] = {
@@ -946,6 +1529,7 @@ static const struct tegra_pmc_soc tegra114_pmc_soc = {
.cpu_powergates = tegra114_cpu_powergates,
.has_tsense_reset = true,
.has_gpu_clamps = false,
+ .is_legacy_powergate = false,
};
static const char * const tegra124_powergates[] = {
@@ -989,6 +1573,7 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = {
.cpu_powergates = tegra124_cpu_powergates,
.has_tsense_reset = true,
.has_gpu_clamps = true,
+ .is_legacy_powergate = false,
};
static const struct of_device_id tegra_pmc_match[] = {
diff --git a/include/dt-bindings/power/tegra-powergate.h b/include/dt-bindings/power/tegra-powergate.h
new file mode 100644
index 000000000000..b8265167c20e
--- /dev/null
+++ b/include/dt-bindings/power/tegra-powergate.h
@@ -0,0 +1,30 @@
+#ifndef _DT_BINDINGS_POWER_TEGRA_POWERGATE_H
+#define _DT_BINDINGS_POWER_TEGRA_POWERGATE_H
+
+#define TEGRA_POWERGATE_CPU 0
+#define TEGRA_POWERGATE_3D 1
+#define TEGRA_POWERGATE_VENC 2
+#define TEGRA_POWERGATE_PCIE 3
+#define TEGRA_POWERGATE_VDEC 4
+#define TEGRA_POWERGATE_L2 5
+#define TEGRA_POWERGATE_MPE 6
+#define TEGRA_POWERGATE_HEG 7
+#define TEGRA_POWERGATE_SATA 8
+#define TEGRA_POWERGATE_CPU1 9
+#define TEGRA_POWERGATE_CPU2 10
+#define TEGRA_POWERGATE_CPU3 11
+#define TEGRA_POWERGATE_CELP 12
+#define TEGRA_POWERGATE_3D1 13
+#define TEGRA_POWERGATE_CPU0 14
+#define TEGRA_POWERGATE_C0NC 15
+#define TEGRA_POWERGATE_C1NC 16
+#define TEGRA_POWERGATE_SOR 17
+#define TEGRA_POWERGATE_DIS 18
+#define TEGRA_POWERGATE_DISB 19
+#define TEGRA_POWERGATE_XUSBA 20
+#define TEGRA_POWERGATE_XUSBB 21
+#define TEGRA_POWERGATE_XUSBC 22
+#define TEGRA_POWERGATE_VIC 23
+#define TEGRA_POWERGATE_IRAM 24
+
+#endif
--
2.1.4
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