| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <c4d41de3-a0c8-6717-18fe-ed2fe119a0fb@redhat.com>
Date: Sat, 30 Jul 2016 13:40:42 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Icenowy Zheng <icenowy@...c.xyz>, Rob Herring <robh+dt@...nel.org>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Chen-Yu Tsai <wens@...e.org>,
Ulf Hansson <ulf.hansson@...aro.org>
Cc: Mark Rutland <mark.rutland@....com>,
Jaehoon Chung <jh80.chung@...sung.com>,
Michal Suchanek <hramrach@...il.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH 2/2] mmc: host: sunxi: add support for A64 mmc controller
Hi,
On 30-07-16 13:35, Icenowy Zheng wrote:
>
>
> 30.07.2016, 18:30, "Hans de Goede" <hdegoede@...hat.com>:
>> Hi,
>>
>> On 30-07-16 11:36, Icenowy Zheng wrote:
>>> A64 SoC features a MMC controller which need only the mod clock, and can
>>> calibrate delay by itself. This patch adds support for the new MMC
>>> controller IP core.
>>>
>>> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
>>
>> Cool stuff, thanks for your work on this!
>>
>>> ---
>>> drivers/mmc/host/sunxi-mmc.c | 166 +++++++++++++++++++++++++++++++------------
>>> 1 file changed, 122 insertions(+), 44 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
>>> index 2ee4c21..ac56bcf 100644
>>> --- a/drivers/mmc/host/sunxi-mmc.c
>>> +++ b/drivers/mmc/host/sunxi-mmc.c
>>> @@ -72,6 +72,14 @@
>>> #define SDXC_REG_CHDA (0x90)
>>> #define SDXC_REG_CBDA (0x94)
>>>
>>> +/* New registers introduced in A64 */
>>> +#define SDXC_REG_A12A 0x058 /* SMC Auto Command 12 Register */
>>> +#define SDXC_REG_SD_NTSR 0x05C /* SMC New Timing Set Register */
>>> +#define SDXC_REG_DRV_DL 0x140 /* Drive Delay Control Register */
>>> +#define SDXC_REG_SAMP_DL_REG 0x144 /* SMC sample delay control */
>>> +#define SDXC_REG_DS_DL_REG 0x148 /* SMC data strobe delay control */
>>> +
>>> +
>>> #define mmc_readl(host, reg) \
>>> readl((host)->reg_base + SDXC_##reg)
>>> #define mmc_writel(host, reg, value) \
>>> @@ -217,6 +225,15 @@
>>> #define SDXC_CLK_50M_DDR 3
>>> #define SDXC_CLK_50M_DDR_8BIT 4
>>>
>>> +#define SDXC_2X_TIMING_MODE BIT(31)
>>> +
>>> +#define SDXC_CAL_START BIT(15)
>>> +#define SDXC_CAL_DONE BIT(14)
>>> +#define SDXC_CAL_DL_SHIFT 8
>>> +#define SDXC_CAL_DL_SW_EN BIT(7)
>>> +#define SDXC_CAL_DL_SW_SHIFT 0
>>> +#define SDXC_CAL_DL_MASK 0x3f
>>> +
>>> struct sunxi_mmc_clk_delay {
>>> u32 output;
>>> u32 sample;
>>> @@ -261,6 +278,9 @@ struct sunxi_mmc_host {
>>>
>>> /* vqmmc */
>>> bool vqmmc_enabled;
>>> +
>>> + /* does the IP block support autocalibration? */
>>> + bool can_calibrate;
>>> };
>>>
>>> static int sunxi_mmc_reset_host(struct sunxi_mmc_host *host)
>>> @@ -653,10 +673,66 @@ static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en)
>>> return 0;
>>> }
>>>
>>> +static int sunxi_mmc_calibrate(struct sunxi_mmc_host *host,
>>> + struct mmc_ios *ios, int reg_off)
>>> +{
>>> + u32 reg = readl(host->reg_base + reg_off);
>>> + u32 delay;
>>> +
>>> + reg &= ~(SDXC_CAL_DL_MASK << SDXC_CAL_DL_SW_SHIFT);
>>> + reg &= ~SDXC_CAL_DL_SW_EN;
>>> +
>>> + writel(reg | SDXC_CAL_START, host->reg_base + reg_off);
>>> +
>>> + dev_dbg(mmc_dev(host->mmc), "calibration started\n");
>>> +
>>> + while (!((reg = readl(host->reg_base + reg_off)) & SDXC_CAL_DONE))
>>> + cpu_relax();
>>> +
>>> + delay = (reg >> SDXC_CAL_DL_SHIFT) & SDXC_CAL_DL_MASK;
>>> +
>>> + reg &= ~SDXC_CAL_START;
>>> + reg |= (delay << SDXC_CAL_DL_SW_SHIFT) | SDXC_CAL_DL_SW_EN;
>>> +
>>> + writel(reg, host->reg_base + reg_off);
>>> +
>>> + dev_dbg(mmc_dev(host->mmc), "calibration ended, res is 0x%x\n", reg);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int sunxi_mmc_determine_delays(struct sunxi_mmc_host *host,
>>> + struct mmc_ios *ios, int rate)
>>> +{
>>> + int index;
>>> +
>>> + if (rate <= 400000) {
>>> + index = SDXC_CLK_400K;
>>> + } else if (rate <= 25000000) {
>>> + index = SDXC_CLK_25M;
>>> + } else if (rate <= 52000000) {
>>> + if (ios->timing != MMC_TIMING_UHS_DDR50 &&
>>> + ios->timing != MMC_TIMING_MMC_DDR52) {
>>> + index = SDXC_CLK_50M;
>>> + } else if (ios->bus_width == MMC_BUS_WIDTH_8) {
>>> + index = SDXC_CLK_50M_DDR_8BIT;
>>> + } else {
>>> + index = SDXC_CLK_50M_DDR;
>>> + }
>>> + } else {
>>> + return -EINVAL;
>>> + }
>>> +
>>> + clk_set_phase(host->clk_sample, host->clk_delays[index].sample);
>>> + clk_set_phase(host->clk_output, host->clk_delays[index].output);
>>> +
>>> + return 0;
>>> +}
>>> +
>>
>> The factoring out of this into a function really should be done in
>> a separate preparation patch, that will also make the patch making
>> the actual functional changes much easier to read.
>
> Thanks.
>
> And I forgot add the infomation that the patch is based on apritzel's
> work...
>
> I will soon send a PATCH v2.
>
> If your A10/13 mmc clock driver can be merged ASAP, then I will be
> able to drop some bits from the patch.
I need to do a v2 of that, I will hopefully send that out today.
Regards,
Hans
>
>>
>> Regards,
>>
>> Hans
>>
>>> static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
>>> struct mmc_ios *ios)
>>> {
>>> - u32 rate, oclk_dly, rval, sclk_dly;
>>> + u32 rate, rval;
>>> u32 clock = ios->clock;
>>> int ret;
>>>
>>> @@ -692,32 +768,18 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
>>> }
>>> mmc_writel(host, REG_CLKCR, rval);
>>>
>>> - /* determine delays */
>>> - if (rate <= 400000) {
>>> - oclk_dly = host->clk_delays[SDXC_CLK_400K].output;
>>> - sclk_dly = host->clk_delays[SDXC_CLK_400K].sample;
>>> - } else if (rate <= 25000000) {
>>> - oclk_dly = host->clk_delays[SDXC_CLK_25M].output;
>>> - sclk_dly = host->clk_delays[SDXC_CLK_25M].sample;
>>> - } else if (rate <= 52000000) {
>>> - if (ios->timing != MMC_TIMING_UHS_DDR50 &&
>>> - ios->timing != MMC_TIMING_MMC_DDR52) {
>>> - oclk_dly = host->clk_delays[SDXC_CLK_50M].output;
>>> - sclk_dly = host->clk_delays[SDXC_CLK_50M].sample;
>>> - } else if (ios->bus_width == MMC_BUS_WIDTH_8) {
>>> - oclk_dly = host->clk_delays[SDXC_CLK_50M_DDR_8BIT].output;
>>> - sclk_dly = host->clk_delays[SDXC_CLK_50M_DDR_8BIT].sample;
>>> - } else {
>>> - oclk_dly = host->clk_delays[SDXC_CLK_50M_DDR].output;
>>> - sclk_dly = host->clk_delays[SDXC_CLK_50M_DDR].sample;
>>> - }
>>> + if (host->can_calibrate) {
>>> + ret = sunxi_mmc_calibrate(host, ios, SDXC_REG_SAMP_DL_REG);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + /* TODO: enable calibrate on sdc2 SDXC_REG_DS_DL_REG of A64 */
>>> } else {
>>> - return -EINVAL;
>>> + ret = sunxi_mmc_determine_delays(host, ios, rate);
>>> + if (ret)
>>> + return ret;
>>> }
>>>
>>> - clk_set_phase(host->clk_sample, sclk_dly);
>>> - clk_set_phase(host->clk_output, oclk_dly);
>>> -
>>> return sunxi_mmc_oclk_onoff(host, 1);
>>> }
>>>
>>> @@ -942,6 +1004,7 @@ static const struct of_device_id sunxi_mmc_of_match[] = {
>>> { .compatible = "allwinner,sun4i-a10-mmc", },
>>> { .compatible = "allwinner,sun5i-a13-mmc", },
>>> { .compatible = "allwinner,sun9i-a80-mmc", },
>>> + { .compatible = "allwinner,sun50i-a64-mmc", },
>>> { /* sentinel */ }
>>> };
>>> MODULE_DEVICE_TABLE(of, sunxi_mmc_of_match);
>>> @@ -990,6 +1053,11 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
>>> else
>>> host->clk_delays = sunxi_mmc_clk_delays;
>>>
>>> + if (of_device_is_compatible(np, "allwinner,sun50i-a64-mmc"))
>>> + host->can_calibrate = true;
>>> + else
>>> + host->can_calibrate = false;
>>> +
>>> ret = mmc_regulator_get_supply(host->mmc);
>>> if (ret) {
>>> if (ret != -EPROBE_DEFER)
>>> @@ -1014,16 +1082,22 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
>>> return PTR_ERR(host->clk_mmc);
>>> }
>>>
>>> - host->clk_output = devm_clk_get(&pdev->dev, "output");
>>> - if (IS_ERR(host->clk_output)) {
>>> - dev_err(&pdev->dev, "Could not get output clock\n");
>>> - return PTR_ERR(host->clk_output);
>>> - }
>>> + /* self-calibrate version of the IP block needs no output/sample */
>>> + if (!host->can_calibrate) {
>>> + host->clk_output = devm_clk_get(&pdev->dev, "output");
>>> + if (IS_ERR(host->clk_output)) {
>>> + dev_err(&pdev->dev, "Could not get output clock\n");
>>> + return PTR_ERR(host->clk_output);
>>> + }
>>>
>>> - host->clk_sample = devm_clk_get(&pdev->dev, "sample");
>>> - if (IS_ERR(host->clk_sample)) {
>>> - dev_err(&pdev->dev, "Could not get sample clock\n");
>>> - return PTR_ERR(host->clk_sample);
>>> + host->clk_sample = devm_clk_get(&pdev->dev, "sample");
>>> + if (IS_ERR(host->clk_sample)) {
>>> + dev_err(&pdev->dev, "Could not get sample clock\n");
>>> + return PTR_ERR(host->clk_sample);
>>> + }
>>> + } else {
>>> + host->clk_sample = NULL;
>>> + host->clk_output = NULL;
>>> }
>>>
>>> host->reset = devm_reset_control_get_optional(&pdev->dev, "ahb");
>>> @@ -1042,16 +1116,18 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
>>> goto error_disable_clk_ahb;
>>> }
>>>
>>> - ret = clk_prepare_enable(host->clk_output);
>>> - if (ret) {
>>> - dev_err(&pdev->dev, "Enable output clk err %d\n", ret);
>>> - goto error_disable_clk_mmc;
>>> - }
>>> + if (!host->can_calibrate) {
>>> + ret = clk_prepare_enable(host->clk_output);
>>> + if (ret) {
>>> + dev_err(&pdev->dev, "Enable output clk err %d\n", ret);
>>> + goto error_disable_clk_mmc;
>>> + }
>>>
>>> - ret = clk_prepare_enable(host->clk_sample);
>>> - if (ret) {
>>> - dev_err(&pdev->dev, "Enable sample clk err %d\n", ret);
>>> - goto error_disable_clk_output;
>>> + ret = clk_prepare_enable(host->clk_sample);
>>> + if (ret) {
>>> + dev_err(&pdev->dev, "Enable sample clk err %d\n", ret);
>>> + goto error_disable_clk_output;
>>> + }
>>> }
>>>
>>> if (!IS_ERR(host->reset)) {
>>> @@ -1078,9 +1154,11 @@ error_assert_reset:
>>> if (!IS_ERR(host->reset))
>>> reset_control_assert(host->reset);
>>> error_disable_clk_sample:
>>> - clk_disable_unprepare(host->clk_sample);
>>> + if (!host->can_calibrate)
>>> + clk_disable_unprepare(host->clk_sample);
>>> error_disable_clk_output:
>>> - clk_disable_unprepare(host->clk_output);
>>> + if (!host->can_calibrate)
>>> + clk_disable_unprepare(host->clk_output);
>>> error_disable_clk_mmc:
>>> clk_disable_unprepare(host->clk_mmc);
>>> error_disable_clk_ahb:
Powered by blists - more mailing lists