projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 97f67898 RN |
1 | /* |
| 2 | * OMAP4-specific DPLL control functions | |
| 3 | * | |
| 4 | * Copyright (C) 2011 Texas Instruments, Inc. | |
| 5 | * Rajendra Nayak | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/errno.h> | |
| 14 | #include <linux/clk.h> | |
| 15 | #include <linux/io.h> | |
| 16 | #include <linux/bitops.h> | |
| 17 | ||
| 18 | #include <plat/cpu.h> | |
| 19 | #include <plat/clock.h> | |
| 20 | ||
| 21 | #include "clock.h" | |
| 22 | #include "cm-regbits-44xx.h" | |
| 23 | ||
| 24 | /* Supported only on OMAP4 */ | |
| 25 | int omap4_dpllmx_gatectrl_read(struct clk *clk) | |
| 26 | { | |
| 27 | u32 v; | |
| 28 | u32 mask; | |
| 29 | ||
| 30 | if (!clk || !clk->clksel_reg || !cpu_is_omap44xx()) | |
| 31 | return -EINVAL; | |
| 32 | ||
| 33 | mask = clk->flags & CLOCK_CLKOUTX2 ? | |
| 34 | OMAP4430_DPLL_CLKOUTX2_GATE_CTRL_MASK : | |
| 35 | OMAP4430_DPLL_CLKOUT_GATE_CTRL_MASK; | |
| 36 | ||
| 37 | v = __raw_readl(clk->clksel_reg); | |
| 38 | v &= mask; | |
| 39 | v >>= __ffs(mask); | |
| 40 | ||
| 41 | return v; | |
| 42 | } | |
| 43 | ||
| 44 | void omap4_dpllmx_allow_gatectrl(struct clk *clk) | |
| 45 | { | |
| 46 | u32 v; | |
| 47 | u32 mask; | |
| 48 | ||
| 49 | if (!clk || !clk->clksel_reg || !cpu_is_omap44xx()) | |
| 50 | return; | |
| 51 | ||
| 52 | mask = clk->flags & CLOCK_CLKOUTX2 ? | |
| 53 | OMAP4430_DPLL_CLKOUTX2_GATE_CTRL_MASK : | |
| 54 | OMAP4430_DPLL_CLKOUT_GATE_CTRL_MASK; | |
| 55 | ||
| 56 | v = __raw_readl(clk->clksel_reg); | |
| 57 | /* Clear the bit to allow gatectrl */ | |
| 58 | v &= ~mask; | |
| 59 | __raw_writel(v, clk->clksel_reg); | |
| 60 | } | |
| 61 | ||
| 62 | void omap4_dpllmx_deny_gatectrl(struct clk *clk) | |
| 63 | { | |
| 64 | u32 v; | |
| 65 | u32 mask; | |
| 66 | ||
| 67 | if (!clk || !clk->clksel_reg || !cpu_is_omap44xx()) | |
| 68 | return; | |
| 69 | ||
| 70 | mask = clk->flags & CLOCK_CLKOUTX2 ? | |
| 71 | OMAP4430_DPLL_CLKOUTX2_GATE_CTRL_MASK : | |
| 72 | OMAP4430_DPLL_CLKOUT_GATE_CTRL_MASK; | |
| 73 | ||
| 74 | v = __raw_readl(clk->clksel_reg); | |
| 75 | /* Set the bit to deny gatectrl */ | |
| 76 | v |= mask; | |
| 77 | __raw_writel(v, clk->clksel_reg); | |
| 78 | } |