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 struct clk_omap_reg r; 35 36 memcpy(&r, &clk->enable_reg, sizeof(r)); 37 r.offset ^= (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 struct clk_omap_reg r; 49 50 memcpy(&r, &clk->enable_reg, sizeof(r)); 51 52 r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN); 53 54 v = ti_clk_ll_ops->clk_readl(&r); 55 v &= ~(1 << clk->enable_bit); 56 ti_clk_ll_ops->clk_writel(v, &r); 57 } 58 59 /** 60 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS 61 * @clk: struct clk * being enabled 62 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into 63 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into 64 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator 65 * 66 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the 67 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function 68 * passes back the correct CM_IDLEST register address for I2CHS 69 * modules. No return value. 70 */ 71 static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk, 72 struct clk_omap_reg *idlest_reg, 73 u8 *idlest_bit, 74 u8 *idlest_val) 75 { 76 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg)); 77 idlest_reg->offset ^= (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST); 78 *idlest_bit = clk->enable_bit; 79 *idlest_val = OMAP24XX_CM_IDLEST_VAL; 80 } 81 82 /* Public data */ 83 84 const struct clk_hw_omap_ops clkhwops_iclk = { 85 .allow_idle = omap2_clkt_iclk_allow_idle, 86 .deny_idle = omap2_clkt_iclk_deny_idle, 87 }; 88 89 const struct clk_hw_omap_ops clkhwops_iclk_wait = { 90 .allow_idle = omap2_clkt_iclk_allow_idle, 91 .deny_idle = omap2_clkt_iclk_deny_idle, 92 .find_idlest = omap2_clk_dflt_find_idlest, 93 .find_companion = omap2_clk_dflt_find_companion, 94 }; 95 96 /* 2430 I2CHS has non-standard IDLEST register */ 97 const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = { 98 .find_idlest = omap2430_clk_i2chs_find_idlest, 99 .find_companion = omap2_clk_dflt_find_companion, 100 }; 101