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 <[email protected]> --- arch/arm/mach-omap2/Kconfig | 1 + arch/arm/mach-omap2/clock.h | 2 + arch/arm/mach-omap2/prm.h | 1 + arch/arm/mach-omap2/prm_common.c | 128 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 132 insertions(+) diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig index dc21df1..4fccbbe 100644 --- a/arch/arm/mach-omap2/Kconfig +++ b/arch/arm/mach-omap2/Kconfig @@ -95,6 +95,7 @@ config ARCH_OMAP2PLUS select SPARSE_IRQ select TI_PRIV_EDMA select USE_OF + select REGMAP_MMIO help Systems based on OMAP2, OMAP3, OMAP4 or OMAP5 diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h index 9595d72..10efab8 100644 --- a/arch/arm/mach-omap2/clock.h +++ b/arch/arm/mach-omap2/clock.h @@ -291,6 +291,8 @@ extern const struct clksel_rate div_1_3_rates[]; extern const struct clksel_rate div_1_4_rates[]; extern const struct clksel_rate div31_1to31_rates[]; +extern struct regmap *clk_regmaps[]; + extern int am33xx_clk_init(void); extern int omap2_clkops_enable_clkdm(struct clk_hw *hw); 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 a2e1174..16ab63c 100644 --- a/arch/arm/mach-omap2/prm_common.c +++ b/arch/arm/mach-omap2/prm_common.c @@ -23,6 +23,12 @@ #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 <linux/regmap.h> #include "soc.h" #include "prm2xxx_3xxx.h" @@ -30,6 +36,7 @@ #include "prm3xxx.h" #include "prm44xx.h" #include "common.h" +#include "clock.h" /* * OMAP_PRCM_MAX_NR_PENDING_REG: maximum number of PRM_IRQ*_MPU regs @@ -464,3 +471,124 @@ int prm_unregister(struct prm_ll_data *pld) return 0; } + +static struct of_device_id omap_prcm_dt_match_table[] = { + { .compatible = "ti,clock-master" }, + { } +}; + +static struct regmap_config ti_clk_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .cache_type = REGCACHE_NONE, +}; + +static LIST_HEAD(prcm_early_devs); + +struct prcm_early_dev { + struct device_node *node; + struct platform_device *dev; + struct list_head link; +}; + +static struct clk_hw_omap regmap_dummy_ck = { + .flags = REGMAP_ADDRESSING, +}; + +static u32 prm_clk_readl(u32 *reg) +{ + return omap2_clk_readl(®map_dummy_ck, reg); +} + +static void prm_clk_writel(u32 val, u32 *reg) +{ + omap2_clk_writel(val, ®map_dummy_ck, reg); +} + +static struct clk_reg_ops omap_clk_reg_ops = { + .clk_readl = prm_clk_readl, + .clk_writel = prm_clk_writel, +}; + +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; + int regmap_index = 0; + + clk_register_reg_ops(&omap_clk_reg_ops); + + 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_mmio(&pdev->dev, mem, + &ti_clk_regmap_config); + clk_regmaps[regmap_index] = regmap; + ti_dt_clk_init_provider(np, regmap_index); + regmap_index++; + } + + 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
