| /* |
| * OMAP3517/3505-specific clock framework functions |
| * |
| * Copyright (C) 2010 Texas Instruments, Inc. |
| * Copyright (C) 2011 Nokia Corporation |
| * |
| * Ranjith Lohithakshan |
| * Paul Walmsley |
| * |
| * Parts of this code are based on code written by |
| * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu, |
| * Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #undef DEBUG |
| |
| #include <linux/kernel.h> |
| #include <linux/clk.h> |
| #include <linux/io.h> |
| |
| #include "clock.h" |
| #include "clock3517.h" |
| #include "cm2xxx_3xxx.h" |
| #include "cm-regbits-34xx.h" |
| |
| /* |
| * In AM35xx IPSS, the {ICK,FCK} enable bits for modules are exported |
| * in the same register at a bit offset of 0x8. The EN_ACK for ICK is |
| * at an offset of 4 from ICK enable bit. |
| */ |
| #define AM35XX_IPSS_ICK_MASK 0xF |
| #define AM35XX_IPSS_ICK_EN_ACK_OFFSET 0x4 |
| #define AM35XX_IPSS_ICK_FCK_OFFSET 0x8 |
| #define AM35XX_IPSS_CLK_IDLEST_VAL 0 |
| |
| /** |
| * am35xx_clk_find_idlest - return clock ACK info for AM35XX IPSS |
| * @clk: struct clk * being enabled |
| * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into |
| * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into |
| * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator |
| * |
| * The interface clocks on AM35xx IPSS reflects the clock idle status |
| * in the enable register itsel at a bit offset of 4 from the enable |
| * bit. A value of 1 indicates that clock is enabled. |
| */ |
| static void am35xx_clk_find_idlest(struct clk *clk, |
| void __iomem **idlest_reg, |
| u8 *idlest_bit, |
| u8 *idlest_val) |
| { |
| *idlest_reg = (__force void __iomem *)(clk->enable_reg); |
| *idlest_bit = clk->enable_bit + AM35XX_IPSS_ICK_EN_ACK_OFFSET; |
| *idlest_val = AM35XX_IPSS_CLK_IDLEST_VAL; |
| } |
| |
| /** |
| * am35xx_clk_find_companion - find companion clock to @clk |
| * @clk: struct clk * to find the companion clock of |
| * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in |
| * @other_bit: u8 ** to return the companion clock bit shift in |
| * |
| * Some clocks don't have companion clocks. For example, modules with |
| * only an interface clock (such as HECC) don't have a companion |
| * clock. Right now, this code relies on the hardware exporting a bit |
| * in the correct companion register that indicates that the |
| * nonexistent 'companion clock' is active. Future patches will |
| * associate this type of code with per-module data structures to |
| * avoid this issue, and remove the casts. No return value. |
| */ |
| static void am35xx_clk_find_companion(struct clk *clk, void __iomem **other_reg, |
| u8 *other_bit) |
| { |
| *other_reg = (__force void __iomem *)(clk->enable_reg); |
| if (clk->enable_bit & AM35XX_IPSS_ICK_MASK) |
| *other_bit = clk->enable_bit + AM35XX_IPSS_ICK_FCK_OFFSET; |
| else |
| *other_bit = clk->enable_bit - AM35XX_IPSS_ICK_FCK_OFFSET; |
| } |
| |
| const struct clkops clkops_am35xx_ipss_module_wait = { |
| .enable = omap2_dflt_clk_enable, |
| .disable = omap2_dflt_clk_disable, |
| .find_idlest = am35xx_clk_find_idlest, |
| .find_companion = am35xx_clk_find_companion, |
| }; |
| |
| /** |
| * am35xx_clk_ipss_find_idlest - return CM_IDLEST info for IPSS |
| * @clk: struct clk * being enabled |
| * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into |
| * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into |
| * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator |
| * |
| * The IPSS target CM_IDLEST bit is at a different shift from the |
| * CM_{I,F}CLKEN bit. Pass back the correct info via @idlest_reg |
| * and @idlest_bit. No return value. |
| */ |
| static void am35xx_clk_ipss_find_idlest(struct clk *clk, |
| void __iomem **idlest_reg, |
| u8 *idlest_bit, |
| u8 *idlest_val) |
| { |
| u32 r; |
| |
| r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20); |
| *idlest_reg = (__force void __iomem *)r; |
| *idlest_bit = AM35XX_ST_IPSS_SHIFT; |
| *idlest_val = OMAP34XX_CM_IDLEST_VAL; |
| } |
| |
| const struct clkops clkops_am35xx_ipss_wait = { |
| .enable = omap2_dflt_clk_enable, |
| .disable = omap2_dflt_clk_disable, |
| .find_idlest = am35xx_clk_ipss_find_idlest, |
| .find_companion = omap2_clk_dflt_find_companion, |
| .allow_idle = omap2_clkt_iclk_allow_idle, |
| .deny_idle = omap2_clkt_iclk_deny_idle, |
| }; |
| |
| |