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Merge branch 'davinci-next' into davinci-for-linus
Conflicts: arch/arm/mach-davinci/board-da830-evm.c arch/arm/mach-davinci/board-da850-evm.c
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@@ -5303,8 +5303,8 @@ F: drivers/*/*s3c2410* | |
| F: drivers/*/*/*s3c2410* | ||
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| TI DAVINCI MACHINE SUPPORT | ||
| P: Kevin Hilman | ||
| M: [email protected] | ||
| M: Kevin Hilman <[email protected]> | ||
| L: [email protected] (subscribers-only) | ||
| Q: http://patchwork.kernel.org/project/linux-davinci/list/ | ||
| S: Supported | ||
| F: arch/arm/mach-davinci | ||
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| /* | ||
| * AEMIF support for DaVinci SoCs | ||
| * | ||
| * Copyright (C) 2010 Texas Instruments Incorporated. http://www.ti.com/ | ||
| * | ||
| * 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. | ||
| */ | ||
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| #include <linux/kernel.h> | ||
| #include <linux/io.h> | ||
| #include <linux/err.h> | ||
| #include <linux/clk.h> | ||
| #include <linux/module.h> | ||
| #include <linux/time.h> | ||
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| #include <mach/aemif.h> | ||
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| /* Timing value configuration */ | ||
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| #define TA(x) ((x) << 2) | ||
| #define RHOLD(x) ((x) << 4) | ||
| #define RSTROBE(x) ((x) << 7) | ||
| #define RSETUP(x) ((x) << 13) | ||
| #define WHOLD(x) ((x) << 17) | ||
| #define WSTROBE(x) ((x) << 20) | ||
| #define WSETUP(x) ((x) << 26) | ||
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| #define TA_MAX 0x3 | ||
| #define RHOLD_MAX 0x7 | ||
| #define RSTROBE_MAX 0x3f | ||
| #define RSETUP_MAX 0xf | ||
| #define WHOLD_MAX 0x7 | ||
| #define WSTROBE_MAX 0x3f | ||
| #define WSETUP_MAX 0xf | ||
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| #define TIMING_MASK (TA(TA_MAX) | \ | ||
| RHOLD(RHOLD_MAX) | \ | ||
| RSTROBE(RSTROBE_MAX) | \ | ||
| RSETUP(RSETUP_MAX) | \ | ||
| WHOLD(WHOLD_MAX) | \ | ||
| WSTROBE(WSTROBE_MAX) | \ | ||
| WSETUP(WSETUP_MAX)) | ||
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| /* | ||
| * aemif_calc_rate - calculate timing data. | ||
| * @wanted: The cycle time needed in nanoseconds. | ||
| * @clk: The input clock rate in kHz. | ||
| * @max: The maximum divider value that can be programmed. | ||
| * | ||
| * On success, returns the calculated timing value minus 1 for easy | ||
| * programming into AEMIF timing registers, else negative errno. | ||
| */ | ||
| static int aemif_calc_rate(int wanted, unsigned long clk, int max) | ||
| { | ||
| int result; | ||
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| result = DIV_ROUND_UP((wanted * clk), NSEC_PER_MSEC) - 1; | ||
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| pr_debug("%s: result %d from %ld, %d\n", __func__, result, clk, wanted); | ||
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| /* It is generally OK to have a more relaxed timing than requested... */ | ||
| if (result < 0) | ||
| result = 0; | ||
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| /* ... But configuring tighter timings is not an option. */ | ||
| else if (result > max) | ||
| result = -EINVAL; | ||
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| return result; | ||
| } | ||
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| /** | ||
| * davinci_aemif_setup_timing - setup timing values for a given AEMIF interface | ||
| * @t: timing values to be progammed | ||
| * @base: The virtual base address of the AEMIF interface | ||
| * @cs: chip-select to program the timing values for | ||
| * | ||
| * This function programs the given timing values (in real clock) into the | ||
| * AEMIF registers taking the AEMIF clock into account. | ||
| * | ||
| * This function does not use any locking while programming the AEMIF | ||
| * because it is expected that there is only one user of a given | ||
| * chip-select. | ||
| * | ||
| * Returns 0 on success, else negative errno. | ||
| */ | ||
| int davinci_aemif_setup_timing(struct davinci_aemif_timing *t, | ||
| void __iomem *base, unsigned cs) | ||
| { | ||
| unsigned set, val; | ||
| unsigned ta, rhold, rstrobe, rsetup, whold, wstrobe, wsetup; | ||
| unsigned offset = A1CR_OFFSET + cs * 4; | ||
| struct clk *aemif_clk; | ||
| unsigned long clkrate; | ||
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| if (!t) | ||
| return 0; /* Nothing to do */ | ||
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| aemif_clk = clk_get(NULL, "aemif"); | ||
| if (IS_ERR(aemif_clk)) | ||
| return PTR_ERR(aemif_clk); | ||
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| clkrate = clk_get_rate(aemif_clk); | ||
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| clkrate /= 1000; /* turn clock into kHz for ease of use */ | ||
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| ta = aemif_calc_rate(t->ta, clkrate, TA_MAX); | ||
| rhold = aemif_calc_rate(t->rhold, clkrate, RHOLD_MAX); | ||
| rstrobe = aemif_calc_rate(t->rstrobe, clkrate, RSTROBE_MAX); | ||
| rsetup = aemif_calc_rate(t->rsetup, clkrate, RSETUP_MAX); | ||
| whold = aemif_calc_rate(t->whold, clkrate, WHOLD_MAX); | ||
| wstrobe = aemif_calc_rate(t->wstrobe, clkrate, WSTROBE_MAX); | ||
| wsetup = aemif_calc_rate(t->wsetup, clkrate, WSETUP_MAX); | ||
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| if (ta < 0 || rhold < 0 || rstrobe < 0 || rsetup < 0 || | ||
| whold < 0 || wstrobe < 0 || wsetup < 0) { | ||
| pr_err("%s: cannot get suitable timings\n", __func__); | ||
| return -EINVAL; | ||
| } | ||
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| set = TA(ta) | RHOLD(rhold) | RSTROBE(rstrobe) | RSETUP(rsetup) | | ||
| WHOLD(whold) | WSTROBE(wstrobe) | WSETUP(wsetup); | ||
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| val = __raw_readl(base + offset); | ||
| val &= ~TIMING_MASK; | ||
| val |= set; | ||
| __raw_writel(val, base + offset); | ||
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| return 0; | ||
| } | ||
| EXPORT_SYMBOL(davinci_aemif_setup_timing); |
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