On Nov 21, 2010, at 7:38 PM, Haojian Zhuang wrote:
> On Thu, Nov 18, 2010 at 3:42 PM, zhangfei gao <zhangfei.gao@xxxxxxxxx> wrote:
>> Different platform will provide different init_sdh to handle private
>> register is not same in various platform.
>> Put init_sdh in set_clock is we don't want to add more call back
>> function to sdhci.c to keep sdhci.c as simple as possible.
>> Currently init_sdh will be called several times when clk is changed:
>> insert, 2 times; remove: 4 times.
>> After clk_gating in MMC stack is enabled, set_clock will send clock=0,
>> and then init_sdh will only called only once as well as enable_clk.
>>
>> From c1abef994120536f9f0498293afeebf5412f22f6 Mon Sep 17 00:00:00 2001
>> From: Zhangfei Gao <zhangfei.gao@xxxxxxxxxxx>
>> Date: Thu, 18 Nov 2010 01:22:23 -0500
>> Subject: [PATCH] sdhci-pxa: init_sdh for different platform
>>
>> The sdhci-pxa ip is same, but may be different version among
>> different platforms, as a result private register have different
>> address.
>> Provide init_sdh in arch/arm/mach to move the difference to platform code.
>>
>> Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxxx>
>> ---
>> arch/arm/mach-mmp/include/mach/mmp2_sdh.h | 58 +++++++++++++++++++++++++++++
>> arch/arm/plat-pxa/include/plat/sdhci.h | 6 +++
>> drivers/mmc/host/sdhci-pxa.c | 34 +----------------
>> 3 files changed, 66 insertions(+), 32 deletions(-)
>> create mode 100644 arch/arm/mach-mmp/include/mach/mmp2_sdh.h
>>
>> diff --git a/arch/arm/mach-mmp/include/mach/mmp2_sdh.h
>> b/arch/arm/mach-mmp/include/mach/mmp2_sdh.h
>> new file mode 100644
>> index 0000000..c1d4a80
>> --- /dev/null
>> +++ b/arch/arm/mach-mmp/include/mach/mmp2_sdh.h
>> @@ -0,0 +1,58 @@
>> +/* linux/arch/arm/mach-mmp/include/mach/mmp2_sdh.h
>> + *
>> + * Copyright 2010 Marvell
>> + * Zhangfei Gao <zhangfei.gao@xxxxxxxxxxx>
>> + *
>> + * MMP2 Platform - sepcific sdh function
>> + *
>> + * 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.
>> + */
>> +
>> +#ifndef __MMP2_SDH_H
>> +#define __MMP2_SDH_H
>> +
>> +#include <linux/mmc/sdhci.h>
>> +#include <plat/sdhci.h>
>> +#include <linux/io.h>
>> +
>> +#define SD_FIFO_PARAM 0x104
>> +#define DIS_PAD_SD_CLK_GATE 0x400
>> +
>> +#define SD_CLOCK_AND_BURST_SIZE_SETUP 0x10A
>> +#define SDCLK_SEL 0x100
>> +#define SDCLK_DELAY_SHIFT 9
>> +#define SDCLK_DELAY_MASK 0x1f
>> +
>> +inline void mmp2_init_sdh(struct sdhci_host *host,
>> + struct sdhci_pxa_platdata *pdata)
>> +{
>> + /*
>> + * tune timing of read data/command when crc error happen
>> + * no performance impact
>> + */
>> + if (pdata && 0 != pdata->clk_delay_cycles) {
>> + u16 tmp;
>> +
>> + tmp = readw(host->ioaddr + SD_CLOCK_AND_BURST_SIZE_SETUP);
>> + tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
>> + << SDCLK_DELAY_SHIFT;
>> + tmp |= SDCLK_SEL;
>> + writew(tmp, host->ioaddr + SD_CLOCK_AND_BURST_SIZE_SETUP);
>> + }
>> +
>> + /*
>> + * disable clock gating per some cards requirement
>> + */
>> +
>> + if (pdata && pdata->flags & PXA_FLAG_DISABLE_CLOCK_GATING) {
>> + u32 tmp = 0;
>> +
>> + tmp = readl(host->ioaddr + SD_FIFO_PARAM);
>> + tmp |= DIS_PAD_SD_CLK_GATE;
>> + writel(tmp, host->ioaddr + SD_FIFO_PARAM);
>> + }
>> +}
>> +
>> +#endif /* __MMP2_SDH_H */
why is this an inline ? no performance impact if regular function and easier to follow.
>> diff --git a/arch/arm/plat-pxa/include/plat/sdhci.h
>> b/arch/arm/plat-pxa/include/plat/sdhci.h
>> index f6f46db..a3a08db 100644
>> --- a/arch/arm/plat-pxa/include/plat/sdhci.h
>> +++ b/arch/arm/plat-pxa/include/plat/sdhci.h
>> @@ -13,6 +13,8 @@
>> #ifndef __PLAT_PXA_SDHCI_H
>> #define __PLAT_PXA_SDHCI_H
>>
>> +#include <linux/mmc/sdhci.h>
>> +
>> /* pxa specific flag */
>> /* Require clock free running */
>> #define PXA_FLAG_DISABLE_CLOCK_GATING (1<<0)
>> @@ -25,12 +27,16 @@
>> * @quirks: quirks of specific device
>> * @flags: flags for platform requirement
>> * @clk_delay_cycles: 1 ~ 0x1f, each step is roughly 100ps, for tuning timing
>> + * @init_sdh: init function for specific card
>> */
>> struct sdhci_pxa_platdata {
>> unsigned int max_speed;
>> unsigned int quirks;
>> unsigned int flags;
>> unsigned int clk_delay_cycles;
>> +
>> + void (*init_sdh)(struct sdhci_host *host,
>> + struct sdhci_pxa_platdata *pdata);
>> };
>>
>> #endif /* __PLAT_PXA_SDHCI_H */
>> diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c
>> index 2b665e4..d628dcc 100644
>> --- a/drivers/mmc/host/sdhci-pxa.c
>> +++ b/drivers/mmc/host/sdhci-pxa.c
>> @@ -29,14 +29,6 @@
>>
>> #define DRIVER_NAME "sdhci-pxa"
>>
>> -#define SD_FIFO_PARAM 0x104
>> -#define DIS_PAD_SD_CLK_GATE 0x400
>> -
>> -#define SD_CLOCK_AND_BURST_SIZE_SETUP 0x10A
>> -#define SDCLK_SEL 0x100
>> -#define SDCLK_DELAY_SHIFT 9
>> -#define SDCLK_DELAY_MASK 0x1f
>> -
>> struct sdhci_pxa {
>> struct sdhci_host *host;
>> struct sdhci_pxa_platdata *pdata;
>> @@ -51,29 +43,11 @@ struct sdhci_pxa {
>> * SDHCI core callbacks *
>> * *
>> \*****************************************************************************/
>> -static inline void tune_timing(struct sdhci_host *host,
>> - struct sdhci_pxa_platdata *pdata)
>> -{
>> - /*
>> - * tune timing of read data/command when crc error happen
>> - * no performance impact
>> - */
>> - if (pdata && 0 != pdata->clk_delay_cycles) {
>> - u16 tmp;
>> -
>> - tmp = readw(host->ioaddr + SD_CLOCK_AND_BURST_SIZE_SETUP);
>> - tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
>> - << SDCLK_DELAY_SHIFT;
>> - tmp |= SDCLK_SEL;
>> - writew(tmp, host->ioaddr + SD_CLOCK_AND_BURST_SIZE_SETUP);
>> - }
>> -}
>>
>> static void set_clock(struct sdhci_host *host, unsigned int clock)
>> {
>> struct sdhci_pxa *pxa = sdhci_priv(host);
>> struct sdhci_pxa_platdata *pdata = pxa->pdata;
>> - u32 tmp = 0;
>>
>> if (clock == 0) {
>> if (pxa->clk_enable) {
>> @@ -81,12 +55,8 @@ static void set_clock(struct sdhci_host *host,
>> unsigned int clock)
>> pxa->clk_enable = 0;
>> }
>> } else {
>> - tune_timing(host, pdata);
>> - if (pdata && pdata->flags & PXA_FLAG_DISABLE_CLOCK_GATING) {
>> - tmp = readl(host->ioaddr + SD_FIFO_PARAM);
>> - tmp |= DIS_PAD_SD_CLK_GATE;
>> - writel(tmp, host->ioaddr + SD_FIFO_PARAM);
>> - }
>> + if (pdata && pdata->init_sdh)
>> + pdata->init_sdh(host, pdata);
>> clk_enable(pxa->clk);
>> pxa->clk_enable = 1;
>> }
>> --
>> 1.7.0.4
>>
>
> Acked
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