This patch provides top level functionality for the DT clock initialization.
Clock tree is initialized hierarchically starting from IP modules (CM/PRM/PRCM)
going down towards individual clock nodes, and finally initializing
clockdomains once all the clocks are ready.
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
arch/arm/mach-omap2/prm.h | 1 +
arch/arm/mach-omap2/prm_common.c | 133 ++++++++++++++++++++++++++++++++++++++
2 files changed, 134 insertions(+)
diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h
index ac25ae6..623db40 100644
--- a/arch/arm/mach-omap2/prm.h
+++ b/arch/arm/mach-omap2/prm.h
@@ -18,6 +18,7 @@
# ifndef __ASSEMBLER__
extern void __iomem *prm_base;
extern void omap2_set_globals_prm(void __iomem *prm);
+int of_prcm_init(void);
# endif
diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
index 228b850..6fa74c6 100644
--- a/arch/arm/mach-omap2/prm_common.c
+++ b/arch/arm/mach-omap2/prm_common.c
@@ -23,12 +23,18 @@
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk-provider.h>
+#include <linux/clk/ti.h>
+#include <linux/of_platform.h>
#include "prm2xxx_3xxx.h"
#include "prm2xxx.h"
#include "prm3xxx.h"
#include "prm44xx.h"
#include "common.h"
+#include "soc.h"
/*
* OMAP_PRCM_MAX_NR_PENDING_REG: maximum number of PRM_IRQ*_MPU regs
@@ -453,3 +459,130 @@ int prm_unregister(struct prm_ll_data *pld)
return 0;
}
+
+static struct of_device_id omap_prcm_dt_match_table[] __initdata = {
+ { .compatible = "ti,prcm" },
+ { .compatible = "ti,prm" },
+ { .compatible = "ti,cm" },
+ { .compatible = "ti,cm2" },
+ { .compatible = "ti,scrm" },
+ { }
+};
+
+
+/*
+ * XXX: implementation for the regmap read/write should be moved to
+ * individual PRCM IP drivers, once those are available.
+ */
+static int ti_clk_regmap_read(void *context, unsigned int reg,
+ unsigned int *val)
+{
+ void __iomem *mem = context;
+ *val = __raw_readl(mem + reg);
+ return 0;
+}
+
+static int ti_clk_regmap_write(void *context, unsigned int reg,
+ unsigned int val)
+{
+ void __iomem *mem = context;
+ __raw_writel(val, mem + reg);
+ return 0;
+}
+
+static struct regmap_config ti_clk_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .reg_read = ti_clk_regmap_read,
+ .reg_write = ti_clk_regmap_write,
+ .fast_io = true,
+ .cache_type = REGCACHE_NONE,
+ .reg_format_endian = REGMAP_ENDIAN_NATIVE,
+ .val_format_endian = REGMAP_ENDIAN_NATIVE,
+};
+
+static LIST_HEAD(prcm_early_devs);
+
+struct prcm_early_dev {
+ struct device_node *node;
+ struct platform_device *dev;
+ struct list_head link;
+};
+
+int __init of_prcm_init(void)
+{
+ struct device_node *np;
+ void __iomem *mem;
+ struct regmap *regmap;
+ struct platform_device *pdev;
+ struct prcm_early_dev *edev;
+
+ for_each_matching_node(np, omap_prcm_dt_match_table) {
+ pdev = platform_device_alloc(np->name, 0);
+ dev_set_name(&pdev->dev, "%s", pdev->name);
+ edev = kzalloc(sizeof(*edev), GFP_KERNEL);
+ edev->dev = pdev;
+ edev->node = np;
+ list_add(&edev->link, &prcm_early_devs);
+ mem = of_iomap(np, 0);
+ ti_clk_regmap_config.name = "0";
+ regmap = regmap_init(&pdev->dev, NULL, mem,
+ &ti_clk_regmap_config);
+ ti_dt_clk_init_provider(np, regmap);
+ }
+
+ ti_dt_clockdomains_setup();
+
+ return 0;
+}
+
+static int prcm_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *of_id =
+ of_match_device(omap_prcm_dt_match_table, &pdev->dev);
+ struct prcm_early_dev *edev;
+ int ret;
+
+ if (!of_id)
+ return 0;
+
+ list_for_each_entry(edev, &prcm_early_devs, link) {
+ if (edev->node == pdev->dev.of_node) {
+ platform_device_add(edev->dev);
+ edev->dev->dev.driver = pdev->dev.driver;
+ ret = device_bind_driver(&edev->dev->dev);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int prcm_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static struct platform_driver prcm_driver = {
+ .probe = prcm_probe,
+ .remove = prcm_remove,
+ .driver = {
+ .name = "prcm-driver",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(omap_prcm_dt_match_table),
+ },
+};
+
+static __init int prcm_init(void)
+{
+ return platform_driver_register(&prcm_driver);
+}
+
+static __exit void prcm_exit(void)
+{
+ platform_driver_unregister(&prcm_driver);
+}
+omap_postcore_initcall(prcm_init);
+module_exit(prcm_exit);
--
1.7.9.5
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