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81b34fbecb
In preparation for multi-OMAP2 kernels, split mach-omap2/clock2xxx_data.c into mach-omap2/clock2420_data.c and mach-omap2/clock2430_data.c. 2430 uses a different device space physical memory layout than past or future OMAPs, and we use a different virtual memory layout as well, which causes trouble for architecture-level code/data that tries to support both. We tried using offsets from the virtual base last year, but those patches never made it upstream; so after some discussion with Tony about the best all-around approach, we'll just grit our teeth and duplicate the structures. The maintenance advantages of a single kernel config that can compile and boot on OMAP2, 3, and 4 platforms are simply too compelling. This approach does have some nice benefits beyond multi-OMAP 2 kernel support. The runtime size of OMAP2420-specific and OMAP2430-specific kernels is smaller, since unused clocks for the other OMAP2 chip will no longer be compiled in. (At some point we will mark the clock data __initdata and allocate it during registration, which will eliminate the runtime memory advantage.) It also makes the clock trees slightly easier to read, since 2420-specific and 2430-specific clocks are no longer mixed together. This patch also splits 2430-specific clock code into its own file, mach-omap2/clock2430.c, which is only compiled in for 2430 builds - mostly for organizational clarity. While here, fix a bug in the OMAP2430 clock tree: "emul_ck" was incorrectly marked as being 2420-only, when actually it is present on both OMAP2420 and OMAP2430. Thanks to Tony for some good discussions about how to approach this problem. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Richard Woodruff <r-woodruff2@ti.com>
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*
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* clock2430.c - OMAP2430-specific clock integration code
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*
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* Copyright (C) 2005-2008 Texas Instruments, Inc.
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* Copyright (C) 2004-2010 Nokia Corporation
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*
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* Contacts:
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* Richard Woodruff <r-woodruff2@ti.com>
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* Paul Walmsley
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*
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* Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
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* Gordon McNutt and RidgeRun, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <plat/clock.h>
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#include "clock.h"
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#include "clock2xxx.h"
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#include "cm.h"
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#include "cm-regbits-24xx.h"
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/**
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* omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
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* @clk: struct clk * being enabled
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* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
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* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
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* @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
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*
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* OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
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* CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function
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* passes back the correct CM_IDLEST register address for I2CHS
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* modules. No return value.
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*/
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static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
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void __iomem **idlest_reg,
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u8 *idlest_bit,
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u8 *idlest_val)
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{
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*idlest_reg = OMAP2430_CM_REGADDR(CORE_MOD, CM_IDLEST);
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*idlest_bit = clk->enable_bit;
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*idlest_val = OMAP24XX_CM_IDLEST_VAL;
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}
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/* 2430 I2CHS has non-standard IDLEST register */
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const struct clkops clkops_omap2430_i2chs_wait = {
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.enable = omap2_dflt_clk_enable,
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.disable = omap2_dflt_clk_disable,
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.find_idlest = omap2430_clk_i2chs_find_idlest,
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.find_companion = omap2_clk_dflt_find_companion,
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};
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