1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OMAP2/3 interface clock control 4 * 5 * Copyright (C) 2011 Nokia Corporation 6 * Paul Walmsley 7 */ 8 #undef DEBUG 9 10 #include <linux/kernel.h> 11 #include <linux/clk-provider.h> 12 #include <linux/io.h> 13 #include <linux/clk/ti.h> 14 15 #include "clock.h" 16 17 /* Register offsets */ 18 #define OMAP24XX_CM_FCLKEN2 0x04 19 #define CM_AUTOIDLE 0x30 20 #define CM_ICLKEN 0x10 21 #define CM_IDLEST 0x20 22 23 #define OMAP24XX_CM_IDLEST_VAL 0 24 25 /* Private functions */ 26 27 /* XXX */ 28 void omap2_clkt_iclk_allow_idle(struct clk_hw_omap *clk) 29 { 30 u32 v; 31 struct clk_omap_reg r; 32 33 memcpy(&r, &clk->enable_reg, sizeof(r)); 34 r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN); 35 36 v = ti_clk_ll_ops->clk_readl(&r); 37 v |= (1 << clk->enable_bit); 38 ti_clk_ll_ops->clk_writel(v, &r); 39 } 40 41 /* XXX */ 42 void omap2_clkt_iclk_deny_idle(struct clk_hw_omap *clk) 43 { 44 u32 v; 45 struct clk_omap_reg r; 46 47 memcpy(&r, &clk->enable_reg, sizeof(r)); 48 49 r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN); 50 51 v = ti_clk_ll_ops->clk_readl(&r); 52 v &= ~(1 << clk->enable_bit); 53 ti_clk_ll_ops->clk_writel(v, &r); 54 } 55 56 /** 57 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS 58 * @clk: struct clk * being enabled 59 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into 60 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into 61 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator 62 * 63 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the 64 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function 65 * passes back the correct CM_IDLEST register address for I2CHS 66 * modules. No return value. 67 */ 68 static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk, 69 struct clk_omap_reg *idlest_reg, 70 u8 *idlest_bit, 71 u8 *idlest_val) 72 { 73 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg)); 74 idlest_reg->offset ^= (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST); 75 *idlest_bit = clk->enable_bit; 76 *idlest_val = OMAP24XX_CM_IDLEST_VAL; 77 } 78 79 /* Public data */ 80 81 const struct clk_hw_omap_ops clkhwops_iclk = { 82 .allow_idle = omap2_clkt_iclk_allow_idle, 83 .deny_idle = omap2_clkt_iclk_deny_idle, 84 }; 85 86 const struct clk_hw_omap_ops clkhwops_iclk_wait = { 87 .allow_idle = omap2_clkt_iclk_allow_idle, 88 .deny_idle = omap2_clkt_iclk_deny_idle, 89 .find_idlest = omap2_clk_dflt_find_idlest, 90 .find_companion = omap2_clk_dflt_find_companion, 91 }; 92 93 /* 2430 I2CHS has non-standard IDLEST register */ 94 const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = { 95 .find_idlest = omap2430_clk_i2chs_find_idlest, 96 .find_companion = omap2_clk_dflt_find_companion, 97 }; 98