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omap: McBSP: Introduce caching in register write operations

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Determine cache size required per McBSP port at init time, based on
processor type running on.

Allocate space for storing cached copies of McBSP register values at
port request.

Modify omap_msbcp_write() function to update the cache with every
register write operation.

Modify omap_mcbsp_read() to support reading from cache or hardware.

Update MCBSP_READ() macro for modified omap_mcbsp_read() function API.

Introduce a new macro that reads from the cache.

Tested on OMAP1510 based Amstrad Delta using linux-omap for-next, commit
fb7380d70e041e4b3892f6b19dff7efb609d15a4 (2.6.33-rc3+ dated 2010-01-11).
Compile-tested with: omap_perseus2_730_defconfig, omap_generic_1610_defconfig,
omap_generic_2420_defconfig, omap_2430sdp_defconfig, omap_3430sdp_defconfig,
omap_4430sdp_defconfig with CONFIG_OMAP_MCBSP=y selected.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Janusz Krzysztofik
2010-02-15 10:03:33 -08:00
committed by Tony Lindgren
parent 8ea3200f1d
commit c8c99699bd
4 changed files with 84 additions and 32 deletions
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16
arch/arm/mach-omap1/mcbsp.c
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@@ -99,9 +99,11 @@ static struct omap_mcbsp_platform_data omap7xx_mcbsp_pdata[] = {
},
};
#define OMAP7XX_MCBSP_PDATA_SZ ARRAY_SIZE(omap7xx_mcbsp_pdata)
#define OMAP7XX_MCBSP_REG_NUM (OMAP_MCBSP_REG_XCERH / sizeof(u16) + 1)
#else
#define omap7xx_mcbsp_pdata NULL
#define OMAP7XX_MCBSP_PDATA_SZ 0
#define OMAP7XX_MCBSP_REG_NUM 0
#endif
#ifdef CONFIG_ARCH_OMAP15XX
@@ -132,9 +134,11 @@ static struct omap_mcbsp_platform_data omap15xx_mcbsp_pdata[] = {
},
};
#define OMAP15XX_MCBSP_PDATA_SZ ARRAY_SIZE(omap15xx_mcbsp_pdata)
#define OMAP15XX_MCBSP_REG_NUM (OMAP_MCBSP_REG_XCERH / sizeof(u16) + 1)
#else
#define omap15xx_mcbsp_pdata NULL
#define OMAP15XX_MCBSP_PDATA_SZ 0
#define OMAP15XX_MCBSP_REG_NUM 0
#endif
#ifdef CONFIG_ARCH_OMAP16XX
@@ -165,19 +169,25 @@ static struct omap_mcbsp_platform_data omap16xx_mcbsp_pdata[] = {
},
};
#define OMAP16XX_MCBSP_PDATA_SZ ARRAY_SIZE(omap16xx_mcbsp_pdata)
#define OMAP16XX_MCBSP_REG_NUM (OMAP_MCBSP_REG_XCERH / sizeof(u16) + 1)
#else
#define omap16xx_mcbsp_pdata NULL
#define OMAP16XX_MCBSP_PDATA_SZ 0
#define OMAP16XX_MCBSP_REG_NUM 0
#endif
int __init omap1_mcbsp_init(void)
{
if (cpu_is_omap7xx())
if (cpu_is_omap7xx()) {
omap_mcbsp_count = OMAP7XX_MCBSP_PDATA_SZ;
if (cpu_is_omap15xx())
omap_mcbsp_cache_size = OMAP7XX_MCBSP_REG_NUM * sizeof(u16);
} else if (cpu_is_omap15xx()) {
omap_mcbsp_count = OMAP15XX_MCBSP_PDATA_SZ;
if (cpu_is_omap16xx())
omap_mcbsp_cache_size = OMAP15XX_MCBSP_REG_NUM * sizeof(u16);
} else if (cpu_is_omap16xx()) {
omap_mcbsp_count = OMAP16XX_MCBSP_PDATA_SZ;
omap_mcbsp_cache_size = OMAP16XX_MCBSP_REG_NUM * sizeof(u16);
}
mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
GFP_KERNEL);