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Diffstat (limited to 'drivers/clk/at91/pmc.c')
-rw-r--r--drivers/clk/at91/pmc.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
new file mode 100644
index 0000000000..5aa9c1f1c8
--- /dev/null
+++ b/drivers/clk/at91/pmc.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/at91_pmc.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/mfd/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/syscore_ops.h>
+
+#include <asm/proc-fns.h>
+
+#include "pmc.h"
+
+#define PMC_MAX_IDS 128
+#define PMC_MAX_PCKS 8
+
+int of_at91_get_clk_range(struct device_node *np, const char *propname,
+ struct clk_range *range)
+{
+ u32 min, max;
+ int ret;
+
+ ret = of_property_read_u32_index(np, propname, 0, &min);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32_index(np, propname, 1, &max);
+ if (ret)
+ return ret;
+
+ if (range) {
+ range->min = min;
+ range->max = max;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
+
+struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
+{
+ unsigned int type = clkspec->args[0];
+ unsigned int idx = clkspec->args[1];
+ struct pmc_data *pmc_data = data;
+
+ switch (type) {
+ case PMC_TYPE_CORE:
+ if (idx < pmc_data->ncore)
+ return pmc_data->chws[idx];
+ break;
+ case PMC_TYPE_SYSTEM:
+ if (idx < pmc_data->nsystem)
+ return pmc_data->shws[idx];
+ break;
+ case PMC_TYPE_PERIPHERAL:
+ if (idx < pmc_data->nperiph)
+ return pmc_data->phws[idx];
+ break;
+ case PMC_TYPE_GCK:
+ if (idx < pmc_data->ngck)
+ return pmc_data->ghws[idx];
+ break;
+ case PMC_TYPE_PROGRAMMABLE:
+ if (idx < pmc_data->npck)
+ return pmc_data->pchws[idx];
+ break;
+ default:
+ break;
+ }
+
+ pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);
+
+ return ERR_PTR(-EINVAL);
+}
+
+struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
+ unsigned int nperiph, unsigned int ngck,
+ unsigned int npck)
+{
+ unsigned int num_clks = ncore + nsystem + nperiph + ngck + npck;
+ struct pmc_data *pmc_data;
+
+ pmc_data = kzalloc(struct_size(pmc_data, hwtable, num_clks),
+ GFP_KERNEL);
+ if (!pmc_data)
+ return NULL;
+
+ pmc_data->ncore = ncore;
+ pmc_data->chws = pmc_data->hwtable;
+
+ pmc_data->nsystem = nsystem;
+ pmc_data->shws = pmc_data->chws + ncore;
+
+ pmc_data->nperiph = nperiph;
+ pmc_data->phws = pmc_data->shws + nsystem;
+
+ pmc_data->ngck = ngck;
+ pmc_data->ghws = pmc_data->phws + nperiph;
+
+ pmc_data->npck = npck;
+ pmc_data->pchws = pmc_data->ghws + ngck;
+
+ return pmc_data;
+}
+
+#ifdef CONFIG_PM
+
+/* Address in SECURAM that say if we suspend to backup mode. */
+static void __iomem *at91_pmc_backup_suspend;
+
+static int at91_pmc_suspend(void)
+{
+ unsigned int backup;
+
+ if (!at91_pmc_backup_suspend)
+ return 0;
+
+ backup = readl_relaxed(at91_pmc_backup_suspend);
+ if (!backup)
+ return 0;
+
+ return clk_save_context();
+}
+
+static void at91_pmc_resume(void)
+{
+ unsigned int backup;
+
+ if (!at91_pmc_backup_suspend)
+ return;
+
+ backup = readl_relaxed(at91_pmc_backup_suspend);
+ if (!backup)
+ return;
+
+ clk_restore_context();
+}
+
+static struct syscore_ops pmc_syscore_ops = {
+ .suspend = at91_pmc_suspend,
+ .resume = at91_pmc_resume,
+};
+
+static const struct of_device_id pmc_dt_ids[] = {
+ { .compatible = "atmel,sama5d2-pmc" },
+ { .compatible = "microchip,sama7g5-pmc", },
+ { /* sentinel */ }
+};
+
+static int __init pmc_register_ops(void)
+{
+ struct device_node *np;
+
+ np = of_find_matching_node(NULL, pmc_dt_ids);
+ if (!np)
+ return -ENODEV;
+
+ if (!of_device_is_available(np)) {
+ of_node_put(np);
+ return -ENODEV;
+ }
+ of_node_put(np);
+
+ np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
+ if (!np)
+ return -ENODEV;
+
+ if (!of_device_is_available(np)) {
+ of_node_put(np);
+ return -ENODEV;
+ }
+ of_node_put(np);
+
+ at91_pmc_backup_suspend = of_iomap(np, 0);
+ if (!at91_pmc_backup_suspend) {
+ pr_warn("%s(): unable to map securam\n", __func__);
+ return -ENOMEM;
+ }
+
+ register_syscore_ops(&pmc_syscore_ops);
+
+ return 0;
+}
+/* This has to happen before arch_initcall because of the tcb_clksrc driver */
+postcore_initcall(pmc_register_ops);
+#endif