1 /* 2 * OMAP2/3 interface clock control 3 * 4 * Copyright (C) 2011 Nokia Corporation 5 * Paul Walmsley 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 #undef DEBUG 12 13 #include <linux/kernel.h> 14 #include <linux/clk-provider.h> 15 #include <linux/io.h> 16 #include <linux/clk/ti.h> 17 18 #include "clock.h" 19 20 /* Register offsets */ 21 #define OMAP24XX_CM_FCLKEN2 0x04 22 #define CM_AUTOIDLE 0x30 23 #define CM_ICLKEN 0x10 24 #define CM_IDLEST 0x20 25 26 #define OMAP24XX_CM_IDLEST_VAL 0 27 28 /* Private functions */ 29 30 /* XXX */ 31 void omap2_clkt_iclk_allow_idle(struct clk_hw_omap *clk) 32 { 33 u32 v; 34 void __iomem *r; 35 36 r = (__force void __iomem *) 37 ((__force u32)clk->enable_reg ^ (CM_AUTOIDLE ^ CM_ICLKEN)); 38 39 v = ti_clk_ll_ops->clk_readl(r); 40 v |= (1 << clk->enable_bit); 41 ti_clk_ll_ops->clk_writel(v, r); 42 } 43 44 /* XXX */ 45 void omap2_clkt_iclk_deny_idle(struct clk_hw_omap *clk) 46 { 47 u32 v; 48 void __iomem *r; 49 50 r = (__force void __iomem *) 51 ((__force u32)clk->enable_reg ^ (CM_AUTOIDLE ^ CM_ICLKEN)); 52 53 v = ti_clk_ll_ops->clk_readl(r); 54 v &= ~(1 << clk->enable_bit); 55 ti_clk_ll_ops->clk_writel(v, r); 56 } 57 58 /** 59 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS 60 * @clk: struct clk * being enabled 61 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into 62 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into 63 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator 64 * 65 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the 66 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function 67 * passes back the correct CM_IDLEST register address for I2CHS 68 * modules. No return value. 69 */ 70 static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk, 71 void __iomem **idlest_reg, 72 u8 *idlest_bit, 73 u8 *idlest_val) 74 { 75 u32 r; 76 77 r = ((__force u32)clk->enable_reg ^ (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST)); 78 *idlest_reg = (__force void __iomem *)r; 79 *idlest_bit = clk->enable_bit; 80 *idlest_val = OMAP24XX_CM_IDLEST_VAL; 81 } 82 83 /* Public data */ 84 85 const struct clk_hw_omap_ops clkhwops_iclk = { 86 .allow_idle = omap2_clkt_iclk_allow_idle, 87 .deny_idle = omap2_clkt_iclk_deny_idle, 88 }; 89 90 const struct clk_hw_omap_ops clkhwops_iclk_wait = { 91 .allow_idle = omap2_clkt_iclk_allow_idle, 92 .deny_idle = omap2_clkt_iclk_deny_idle, 93 .find_idlest = omap2_clk_dflt_find_idlest, 94 .find_companion = omap2_clk_dflt_find_companion, 95 }; 96 97 /* 2430 I2CHS has non-standard IDLEST register */ 98 const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = { 99 .find_idlest = omap2430_clk_i2chs_find_idlest, 100 .find_companion = omap2_clk_dflt_find_companion, 101 }; 102