[RFC PATCH v2 05/13] mmc: add nexell driver
Jaehoon Chung
jh80.chung at samsung.com
Fri Apr 10 02:25:52 CEST 2020
Hi,
On 4/10/20 2:33 AM, Stefan B. wrote:
> Hi,
>
> see below my answers to your questions.
>
> Regards
> Stefan Bosch
>
>
> Hi,
>
> thanks a lot for your reply. As you already guessed I have ported the outdated U-Boot from FriendlyARM, see:
> https://protect2.fireeye.com/url?k=00de144b-5d1421fc-00df9f04-0cc47a3003e8-6dd6a1886465f918&q=1&u=https%3A%2F%2Fgithub.com%2Ffriendlyarm%2Fu-boot%2Ftree%2Fnanopi2-v2016.01
>
> The original MMC-driver has been nexell_dw_mmc.c, so I renamed it to nexell_dw_mmc_dm.c after changing to DM.
>
> I will have a closer look at your suggestions and give you feedback ASAP.
I don't know that you had received reviews about other patches.
If you want to apply new chip, then i think you need to implement drivers based on DM.
>
>
> Regards
> Stefan Bosch
>
>
> Am 02.04.20 um 13:03 schrieb Jaehoon Chung:
>> Hi,
>>
>> On 3/28/20 6:43 PM, Stefan Bosch wrote:
>>> Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
>>> - mmc: nexell_dw_mmc.c changed to nexell_dw_mmc_dm.c (switched to DM).
>>
>> It doesn't need to add postfix as _dm.
>>
> Ok, I have renamed it to nexell_dw_mmc.c.
>
>>>
>>> Signed-off-by: Stefan Bosch <stefan_b at posteo.net>
>>> ---
>>>
>>> Changes in v2:
>>> - commit "i2c: mmc: add nexell driver (gpio, i2c, mmc, pwm)" splitted
>>> into separate commits for gpio, i2c, mmc, pwm.
>>>
>>> drivers/mmc/Kconfig | 6 +
>>> drivers/mmc/Makefile | 1 +
>>> drivers/mmc/nexell_dw_mmc_dm.c | 350 +++++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 357 insertions(+)
>>> create mode 100644 drivers/mmc/nexell_dw_mmc_dm.c
>>>
>>> diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
>>> index 2f0eedc..bb8e7c0 100644
>>> --- a/drivers/mmc/Kconfig
>>> +++ b/drivers/mmc/Kconfig
>>> @@ -253,6 +253,12 @@ config MMC_DW_SNPS
>>> This selects support for Synopsys DesignWare Memory Card Interface driver
>>> extensions used in various Synopsys ARC devboards.
>>> +config NEXELL_DWMMC
>>> + bool "Nexell SD/MMC controller support"
>>> + depends on ARCH_NEXELL
>>> + depends on MMC_DW
>>> + default y
>>
>> Not depends on DM_MMC?
>>
> You are right, I have inserted "depends on DM_MMC". I missed this when changing to DM.
>
>>> +
>>> config MMC_MESON_GX
>>> bool "Meson GX EMMC controller support"
>>> depends on DM_MMC && BLK && ARCH_MESON
>>> diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
>>> index 9c1f8e5..a7b5a7b 100644
>>> --- a/drivers/mmc/Makefile
>>> +++ b/drivers/mmc/Makefile
>>> @@ -43,6 +43,7 @@ obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o
>>> obj-$(CONFIG_SH_SDHI) += sh_sdhi.o
>>> obj-$(CONFIG_STM32_SDMMC2) += stm32_sdmmc2.o
>>> obj-$(CONFIG_JZ47XX_MMC) += jz_mmc.o
>>> +obj-$(CONFIG_NEXELL_DWMMC) += nexell_dw_mmc_dm.o
>>> # SDHCI
>>> obj-$(CONFIG_MMC_SDHCI) += sdhci.o
>>> diff --git a/drivers/mmc/nexell_dw_mmc_dm.c b/drivers/mmc/nexell_dw_mmc_dm.c
>>> new file mode 100644
>>> index 0000000..b06b60d
>>> --- /dev/null
>>> +++ b/drivers/mmc/nexell_dw_mmc_dm.c
>>> @@ -0,0 +1,350 @@
>>> +// SPDX-License-Identifier: GPL-2.0+
>>> +/*
>>> + * (C) Copyright 2016 Nexell
>>> + * Youngbok, Park <park at nexell.co.kr>
>>> + *
>>> + * (C) Copyright 2019 Stefan Bosch <stefan_b at posteo.net>
>>> + */
>>> +
>>> +#include <common.h>
>>> +#include <clk.h>
>>> +#include <dm.h>
>>> +#include <dt-structs.h>
>>> +#include <dwmmc.h>
>>> +#include <syscon.h>
>>> +#include <asm/gpio.h>
>>> +#include <asm/arch/nx_gpio.h>
>>> +#include <asm/arch/reset.h>
>>> +
>>> +#define DWMCI_CLKSEL 0x09C
>>> +#define DWMCI_SHIFT_0 0x0
>>> +#define DWMCI_SHIFT_1 0x1
>>> +#define DWMCI_SHIFT_2 0x2
>>> +#define DWMCI_SHIFT_3 0x3
>>> +#define DWMCI_SET_SAMPLE_CLK(x) (x)
>>> +#define DWMCI_SET_DRV_CLK(x) ((x) << 16)
>>> +#define DWMCI_SET_DIV_RATIO(x) ((x) << 24)
>>> +#define DWMCI_CLKCTRL 0x114
>>> +#define NX_MMC_CLK_DELAY(x, y, a, b) ((((x) & 0xFF) << 0) |\
>>> + (((y) & 0x03) << 16) |\
>>> + (((a) & 0xFF) << 8) |\
>>> + (((b) & 0x03) << 24))
>>> +
>>> +struct nexell_mmc_plat {
>>> + struct mmc_config cfg;
>>> + struct mmc mmc;
>>> +};
>>> +
>>> +struct nexell_dwmmc_priv {
>>> + struct clk *clk;
>>> + struct dwmci_host host;
>>> + int fifo_size;
>>> + bool fifo_mode;
>>> + int frequency;
>>> + u32 min_freq;
>>> + u32 max_freq;
>>> + int d_delay;
>>> + int d_shift;
>>> + int s_delay;
>>> + int s_shift;
>>> +
>>> +};
>>> +
>>> +struct clk *clk_get(const char *id);
>>> +
>>> +static void set_pin_stat(int index, int bit, int value)
>>> +{
>>> +#if !defined(CONFIG_SPL_BUILD)
>>> + nx_gpio_set_pad_function(index, bit, value);
>>> +#else
>>> +#if defined(CONFIG_ARCH_S5P4418) || \
>>> + defined(CONFIG_ARCH_S5P6818)
>>> +
>>> + unsigned long base[5] = {
>>> + PHY_BASEADDR_GPIOA, PHY_BASEADDR_GPIOB,
>>> + PHY_BASEADDR_GPIOC, PHY_BASEADDR_GPIOD,
>>> + PHY_BASEADDR_GPIOE,
>>> + };
>>
>> I don't understand why gpio pin is set in mmc driver?
>> If nexell soc will change the gpio map and function value, does it needs to add other gpio control?
>>
>>> +
>>> + dw_mmc_set_pin(base[index], bit, value);
>>> +#endif
>>> +#endif
>>> +}
>>> +
>>> +static void nx_dw_mmc_set_pin(struct dwmci_host *host)
>>> +{
>>> + debug(" %s(): dev_index == %d", __func__, host->dev_index);
>>> +
>>> + switch (host->dev_index) {
>>> + case 0:
>>> + set_pin_stat(0, 29, 1);
>>> + set_pin_stat(0, 31, 1);
>>> + set_pin_stat(1, 1, 1);
>>> + set_pin_stat(1, 3, 1);
>>> + set_pin_stat(1, 5, 1);
>>> + set_pin_stat(1, 7, 1);
>>> + break;
>>> + case 1:
>>> + set_pin_stat(3, 22, 1);
>>> + set_pin_stat(3, 23, 1);
>>> + set_pin_stat(3, 24, 1);
>>> + set_pin_stat(3, 25, 1);
>>> + set_pin_stat(3, 26, 1);
>>> + set_pin_stat(3, 27, 1);
>>> + break;
>>> + case 2:
>>> + set_pin_stat(2, 18, 2);
>>> + set_pin_stat(2, 19, 2);
>>> + set_pin_stat(2, 20, 2);
>>> + set_pin_stat(2, 21, 2);
>>> + set_pin_stat(2, 22, 2);
>>> + set_pin_stat(2, 23, 2);
>>> + if (host->buswidth == 8) {
>>> + set_pin_stat(4, 21, 2);
>>> + set_pin_stat(4, 22, 2);
>>> + set_pin_stat(4, 23, 2);
>>> + set_pin_stat(4, 24, 2);
>>> + }
>>> + break;
>>> + default:
>>> + debug(" is invalid!");
>>
>> Is invalid..then will not work fine?
>>
>> i don't check your patch fully.
>> Your patch doesn't control gpio with dt?
>> Well, i don't agree this concept. it need to get opinion how to think about this.
>>
> Nexell has not implemented an pinctrl-driver, so the GPIOs are switched to MMC-function here.
> I have removed the above "default", now I check for a valid dev_index in nexell_dwmmc_ofdata_to_platdata().
Then it needs to implement pinctrl driver.
>
>>> + }
>>> + debug("\n");
>>> +}
>>> +
>>> +static void nx_dw_mmc_clksel(struct dwmci_host *host)
>>> +{
>>> + u32 val;
>>> +
>>> +#ifdef CONFIG_BOOST_MMC
>>
>> What is BOOST_MMC?
>>
> This influences what value is written to register offset 0x9C of the MMC-controller. Unfortunatelly, I can not give you more info because this register is indicated as "Reserved" in the S5P4418-datasheet I have access to (Revision 0.10 from October 2014).
I didn't find where BOOST_MMC config is defined.
And it can be used with device-tree property. As i know it's relevant to clk phase and timing.
>
>>> + val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
>>> + DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(1);
>>> +#else
>>> + val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
>>> + DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(3);
>>> +#endif
>>> +
>>> + dwmci_writel(host, DWMCI_CLKSEL, val);
>>> +}
>>> +
>>> +static void nx_dw_mmc_reset(int ch)
>>> +{
>>> + int rst_id = RESET_ID_SDMMC0 + ch;
>>
>> RESET_ID_SDMMC0?
>>
> This is defined in arch/arm/include/asm/arch/nexell.h.
>
>>> +
>>> + nx_rstcon_setrst(rst_id, 0);
>>> + nx_rstcon_setrst(rst_id, 1);
>>> +}
>>> +
>>> +static void nx_dw_mmc_clk_delay(struct udevice *dev)
>>> +{
>>> + unsigned int delay;
>>> + struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
>>> + struct dwmci_host *host = &priv->host;
>>> +
>>> + delay = NX_MMC_CLK_DELAY(priv->d_delay,
>>> + priv->d_shift, priv->s_delay, priv->s_shift);
>>> +
>>> + writel(delay, (host->ioaddr + DWMCI_CLKCTRL));
>>> + debug("%s(): Values set: d_delay==%d, d_shift==%d, s_delay==%d, "
>>> + "s_shift==%d\n", __func__, priv->d_delay, priv->d_shift,
>>> + priv->s_delay, priv->s_shift);
>>> +}
>>> +
>>> +static unsigned int nx_dw_mmc_get_clk(struct dwmci_host *host, uint freq)
>>> +{
>>> + struct clk *clk;
>>> + struct udevice *dev = host->priv;
>>> + struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
>>> +
>>> + int index = host->dev_index;
>>> + char name[50] = { 0, };
>>> +
>>> + clk = priv->clk;
>>> + if (!clk) {
>>> + sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
>>
>> DEV_NAME_SDHC ???
>>
> This is also defined in arch/arm/include/asm/arch/nexell.h: "nx-sdhc"
>
>>> + clk = clk_get((const char *)name);
>>> + if (!clk)
>>> + return 0;
>>> + priv->clk = clk;
>>> + }
>>> +
>>> + return clk_get_rate(clk) / 2;
>>> +}
>>> +
>>> +static unsigned long nx_dw_mmc_set_clk(struct dwmci_host *host,
>>> + unsigned int rate)
>>> +{
>>> + struct clk *clk;
>>> + char name[50] = { 0, };
>>> + struct udevice *dev = host->priv;
>>> + struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
>>> +
>>> + int index = host->dev_index;
>>> +
>>> + clk = priv->clk;
>>> + if (!clk) {
>>> + sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
>>> + clk = clk_get((const char *)name);
>>> + if (!clk)
>>> + return 0;
>>> + priv->clk = clk;
>>> + }
>>> +
>>> + clk_disable(clk);
>>> + rate = clk_set_rate(clk, rate);
>>> + clk_enable(clk);
>>> +
>>> + return rate;
>>> +}
>>> +
>>> +static int nexell_dwmmc_ofdata_to_platdata(struct udevice *dev)
>>> +{
>>> + /* if (dev): *priv = dev->priv, else: *priv = NULL */
>>> + struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
>>> + struct dwmci_host *host = &priv->host;
>>> + int val = -1;
>>> +
>>> + debug("%s()\n", __func__);
>>> +
>>> + host->name = dev->name;
>>> + host->ioaddr = dev_read_addr_ptr(dev);
>>> +
>>> + val = dev_read_u32_default(dev, "nexell,bus-width", -1);
>>> + if (val < 0) {
>>> + debug(" 'nexell,bus-width' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + host->buswidth = val;
>>> + host->get_mmc_clk = nx_dw_mmc_get_clk;
>>> + host->clksel = nx_dw_mmc_clksel;
>>> + host->priv = dev;
>>> +
>>> + val = dev_read_u32_default(dev, "index", -1);
>>> + if (val < 0) {
>>> + debug(" 'index' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + host->dev_index = val;
>>> +
>>> + val = dev_read_u32_default(dev, "fifo-size", 0x20);
>>> + if (val <= 0) {
>>> + debug(" 'fifo-size' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + priv->fifo_size = val;
>>> +
>>> + priv->fifo_mode = dev_read_bool(dev, "fifo-mode");
>>> +
>>> + val = dev_read_u32_default(dev, "frequency", -1);
>>> + if (val < 0) {
>>> + debug(" 'frequency' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + priv->frequency = val;
>>> +
>>> + val = dev_read_u32_default(dev, "max-frequency", -1);
>>> + if (val < 0) {
>>> + debug(" 'max-frequency' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + priv->max_freq = val;
>>> + priv->min_freq = 400000; /* 400 kHz */
>>> +
>>> + val = dev_read_u32_default(dev, "nexell,drive_dly", -1);
>>> + if (val < 0) {
>>> + debug(" 'nexell,drive_dly' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + priv->d_delay = val;
>>> +
>>> + val = dev_read_u32_default(dev, "nexell,drive_shift", -1);
>>> + if (val < 0) {
>>> + debug(" 'nexell,drive_shift' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + priv->d_shift = val;
>>> +
>>> + val = dev_read_u32_default(dev, "nexell,sample_dly", -1);
>>> + if (val < 0) {
>>> + debug(" 'nexell,sample_dly' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + priv->s_delay = val;
>>> +
>>> + val = dev_read_u32_default(dev, "nexell,sample_shift", -1);
>>> + if (val < 0) {
>>> + debug(" 'nexell,sample_shift' missing/invalid!\n");
>>> + return -EINVAL;
>>> + }
>>> + priv->s_shift = val;
>>> +
>>> + debug(" index==%d, name==%s, ioaddr==0x%08x, buswidth==%d, "
>>> + "fifo_size==%d, fifo_mode==%d, frequency==%d\n",
>>> + host->dev_index, host->name, (u32)host->ioaddr,
>>> + host->buswidth, priv->fifo_size, priv->fifo_mode,
>>> + priv->frequency);
>>> + debug(" min_freq==%d, max_freq==%d, delay: "
>>> + "0x%02x:0x%02x:0x%02x:0x%02x\n",
>>> + priv->min_freq, priv->max_freq, priv->d_delay,
>>> + priv->d_shift, priv->s_delay, priv->s_shift);
>>
>> entirely not readable. not need to assign again with val.
>>
>> priv->s_deley = dev_read_u32_default();
>>
>>
> I have reworked nexell_dwmmc_ofdata_to_platdata(), i.e. valid default values are used now (where possible) and the appropriate if-blocks have been removed.
>
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int nexell_dwmmc_probe(struct udevice *dev)
>>> +{
>>> + struct nexell_mmc_plat *plat = dev_get_platdata(dev);
>>> + struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
>>> + struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
>>> + struct dwmci_host *host = &priv->host;
>>> + struct udevice *pwr_dev __maybe_unused;
>>> +
>>> + debug("%s():\n", __func__);
>>
>> Don't add unnecessary debug code. it's meaningless even if it's enabled.
>>
> Ok, I have removed this debug code.
>
>> Well, i didn't check other patches..but i think that your patches seems to based on older u-boot version.
>>
>> Best Regards,
>> Jaehoon Chung
>>
>>
>>> +
>>> + host->fifoth_val = MSIZE(0x2) |
>>> + RX_WMARK(priv->fifo_size / 2 - 1) |
>>> + TX_WMARK(priv->fifo_size / 2);
>>> +
>>> + host->fifo_mode = priv->fifo_mode;
>>> +
>>> + dwmci_setup_cfg(&plat->cfg, host, priv->max_freq, priv->min_freq);
>>> + host->mmc = &plat->mmc;
>>> + host->mmc->priv = &priv->host;
>>> + host->mmc->dev = dev;
>>> + upriv->mmc = host->mmc;
>>> +
>>> + nx_dw_mmc_set_pin(host);
>>> +
>>> + debug(" nx_dw_mmc_set_clk(host, frequency * 4 == %d)\n",
>>> + priv->frequency * 4);
>>> + nx_dw_mmc_set_clk(host, priv->frequency * 4);
>>> +
>>> + nx_dw_mmc_reset(host->dev_index);
>>> + nx_dw_mmc_clk_delay(dev);
>>> +
>>> + return dwmci_probe(dev);
>>> +}
>>> +
>>> +static int nexell_dwmmc_bind(struct udevice *dev)
>>> +{
>>> + struct nexell_mmc_plat *plat = dev_get_platdata(dev);
>>> +
>>> + return dwmci_bind(dev, &plat->mmc, &plat->cfg);
>>> +}
>>> +
>>> +static const struct udevice_id nexell_dwmmc_ids[] = {
>>> + { .compatible = "nexell,nexell-dwmmc" },
>>> + { }
>>> +};
>>> +
>>> +U_BOOT_DRIVER(nexell_dwmmc_drv) = {
>>> + .name = "nexell_dwmmc",
>>> + .id = UCLASS_MMC,
>>> + .of_match = nexell_dwmmc_ids,
>>> + .ofdata_to_platdata = nexell_dwmmc_ofdata_to_platdata,
>>> + .ops = &dm_dwmci_ops,
>>> + .bind = nexell_dwmmc_bind,
>>> + .probe = nexell_dwmmc_probe,
>>> + .priv_auto_alloc_size = sizeof(struct nexell_dwmmc_priv),
>>> + .platdata_auto_alloc_size = sizeof(struct nexell_mmc_plat),
>>> +};
>>>
>>
>
>
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