Hi Pavel,
On 05/17/2013 06:46 AM, Pavel Machek wrote:
> Hi!
>
>> Add platform specific functionality for the DW SD/MMC driver for
>> SoCFPGA. Move SDMMC_CMD_USE_HOLD_REG to dw_mmc.h so other platforms
>> can use this define.
>
>> --- /dev/null
>> +++ b/drivers/mmc/host/dw_mmc-socfpga.c
>> @@ -0,0 +1,139 @@
>> +/*
>> + * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card
>> Interface driver
>> + *
>> + * Copyright (C) 2012, Samsung Electronics Co., Ltd.
>> + * Copyright (C) 2013 Altera Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * Taken from dw_mmc_exynos.c
>
> Actually it is dw_mmc-exynos.c
Will fix in rev3.
>
>> +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108
>> +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7
>> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \
>> + ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38))
>
> Should SYSMGR stuff go to shared header file somewhere?
>
>> +extern void __iomem *sys_manager_base_addr;
>
> This is unused.
Will remove.
>
>> +/* SOCFPGA implementation specific driver private data */
>> +struct dw_mci_socfpga_priv_data {
>> + u8 ciu_div;
>
> comment would be nice, something like
> /* card interface unit divisor */ ?
>
>> + u32 hs_timing;
>
> /* card interface unit phase shift for RX/TX mode */
> ?
Will add comments.
>
>> +static int dw_mci_socfpga_setup_clock(struct dw_mci *host)
>> +{
>> + struct dw_mci_socfpga_priv_data *priv = host->priv;
>> +
>> + clk_disable(host->ciu_clk);
>> + regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET,
>> priv->hs_timing);
>> + clk_enable(host->ciu_clk);
>> +
>> + host->bus_hz /= (priv->ciu_div + 1);
>
> Previous version said:
>
> + host->bus_hz /= priv->ciu_div;
>
> I see you want to avoid division by zero, but this will introduce
> significant error for low divisors, right? Is divisor of 0 valid?
Divisor of 0 is not valid. Not sure what you mean my low divisos?
Thanks,
Dinh
>
> Otherwise it looks good. Thanks,
> Pavel
>
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