clkt_iclk.c (2558B)
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 */ 28void 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 */ 42void 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 */ 68static 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 81const 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 86const 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 */ 94const 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};