[PATCH v6 0/7] RISC-V: Add MMC support for TH1520 boards

[Ulf Hansson]

On Tue, 14 Nov 2023 at 22:08, Drew Fustini <dfustini at baylibre.com> wrote:
>
> This series adds support for the MMC controller in the T-Head TH1520
> SoC, and it enables the eMMC and microSD slot on both the BeagleV
> Ahead and the Sipeed LicheePi 4A.
>
> I tested on top of v6.6 with riscv defconfig. I was able to boot the
> Ahead [1] and LPi4a [2] from eMMC. This patch series also exists as a
> git branch [3].
>
> Note: I have only tested eMMC and microSD. I have not yet configured
> or tested the mmc controller used for SDIO WiFi yet.
>
> References:
> [1] https://gist.github.com/pdp7/881342620ec1509685f23a387e2fc8d7
> [2] https://gist.github.com/pdp7/97017ad88d83fccac18eba69bff817b7
> [3] https://github.com/pdp7/linux/tree/b4/th1520-mmc
>
> Changes in PATCH v6:
> - set the mmc nodes to disabled in the th1520.dtsi

Patch 1 -> 3 , applied for next, thanks!

Kind regards
Uffe


>
> Changes in PATCH v5:
> https://lore.kernel.org/r/20231109-th1520-mmc-v5-0-018bd039cf17@baylibre.com
> - fix logic in th1520_sdhci_set_phy() to correctly check that both
>   MMC_CAP2_NO_SD and MMC_CAP2_NO_SDIO are set in host->mmc->caps2
> - add Acked-by's from Adrian
>
> Changes in PATCH v4:
> https://lore.kernel.org/linux-riscv/20231101-th1520-mmc-v4-0-86e0216b5994@baylibre.com/
> - set DWCMSHC_CARD_IS_EMMC when (MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO)
>   as checking MMC_CAP_NONREMOVABLE is not sufficient
> - change prefix of phy functions from th1520 to dwcmshc as they are not
>   th1520 specific
> - remove unneeded check of priv in dwcmshc_phy_1_8v_init()
> - remove unneeded check of auto-tuning in th1520_execute_tuning()
> - fix order of new nodes in th1520-beaglev-ahead.dts: move sdhci_clk
>   before uart_sclk, move mmc0 and mmc1 before uart0
> - fix comment typos pointed out by Adrian
> - add trailers that I missed from v2
>
> Changes in PATCH v3:
> https://lore.kernel.org/r/20231023-th1520-mmc-v3-0-abc5e7491166@baylibre.com
> - always call th1520_sdhci_set_phy() in th1520_set_uhs_signaling()
>   and not only when timing is MMC_TIMING_MMC_HS400. This allows the
>   microSD slot to work as th1520_phy_3_3v_init() is called from
>   th1520_sdhci_set_phy().
> - add mmc1 node for mmc controller connected to the microSD slot
> - add enable mmc1 and add properties for microSD on the Ahead and LPi4A
>
> Changes in PATCH v2:
> https://lore.kernel.org/r/20231017-th1520-mmc-v2-0-4678c8cc4048@baylibre.com
> - make use of BIT(), GENMASK(), FIELD_PREP(), FIELD_GET()
> - add EXPORT_SYMBOL_GPL(__sdhci_execute_tuning)
> - call th1520_phy_1_8v_init() when FLAG_IO_FIXED_1V8 is set
> - set DWCMSHC_CARD_IS_EMMC when mmc caps contains MMC_CAP_NONREMOVABLE
> - remove manipulation of AT_CTRL_AT_EN from th1520_set_uhs_signaling()
> - remove unneccessary cycle of enabling and disabling AT_CTRL_AT_EN in
>   th1520_execute_tuning()
> - remove th1520_phy_1_8v_init_no_pull()
> - remove th1520_phy_3_3v_init_no_pull()
> - remove FLAG_PULL_UP_EN from priv->flags
> - remove thead,phy-pull-up device tree property
>
> Changes in PACH v1:
> https://lore.kernel.org/all/20230921-th1520-mmc-v1-0-49f76c274fb3@baylibre.com/
> - ADMA mode now works correctly due to a patch from Jisheng on the list
>   ("riscv: dts: thead: set dma-noncoherent to soc bus") and this commit
>   from Icenowy that is now merged: 8eb8fe67e2c8 ("riscv: errata: fix
>   T-Head dcache.cva encoding").
> - Expose __sdhci_execute_tuning from sdhci.c so that it can be called
>   from th1520_execute_tuning()
> - Refactor the define macros for all the PHY related registers to make
>   it easier to understand the bit fields that the code is manipulating
> - Replace magic numbers in the PHY register writes with proper defines
> - Replace non_removable in dwcmshc_priv with check of mmc_host.caps
> - Drop dt prop "thead,io-fixed-1v8" and instead check for existing
>   properties: "mmc-ddr-1_8v", "mmc-hs200-1_8v", or "mmc-hs400-1_8v"
> - Rename dt prop from "thead,pull-up" to "thead,phy-pull-up" and
>   improve the description in the dt binding
> - Replace pull_up_en in dwcmshc_priv with bit field in new flags field
> - Create th1520_set_uhs_signaling() and call dwcmshc_set_uhs_signaling()
>   from it instead of adding th1520 code to dwcmshc_set_uhs_signaling()
> - Return -EIO instead of -1 upon errors in th1520_execute_tuning()
>
> Changes in RFC v2:
> https://lore.kernel.org/linux-riscv/20230724-th1520-emmc-v2-0-132ed2e2171e@baylibre.com/
> - Expand dwcmshc_priv based on driver in the T-Head 5.10 kernel:
>   delay_line, non_removable, pull_up_en, io_fixed_1v8
> - New boolean property "thead,pull-up" indicates phy pull-up config
> - New boolean property "thead,io-fixed-1v8" indicates that io voltage
>   should be set to 1.8V during reset
> - Add th1520_phy_1_8v_init() as voltage_switch op
> - Add th1520_execute_tuning() as the platform_execute_tuning op
> - Added th1520_sdhci_reset() as the .reset op. This function will set
>   io voltage to 1.8V after calling the standard sdhci_reset() function.
> - Modified dwcmshc_set_uhs_signaling() to enable SDHCI_CTRL_VDD_180 when
>   io_fixed_1v8 is true
> - Add many defines for register offsets and settings based on the mmc
>   support in the T-Head downstream v5.10 kernel
>
> RFC v1 series:
> https://lore.kernel.org/r/20230724-th1520-emmc-v1-0-cca1b2533da2@baylibre.com
>
> Signed-off-by: Drew Fustini <dfustini at baylibre.com>
> ---
> Drew Fustini (7):
>       dt-bindings: mmc: sdhci-of-dwcmhsc: Add T-Head TH1520 support
>       mmc: sdhci: add __sdhci_execute_tuning() to header
>       mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520
>       riscv: defconfig: Enable mmc and dma drivers for T-Head TH1520
>       riscv: dts: thead: Add TH1520 mmc controllers and sdhci clock
>       riscv: dts: thead: Enable BeagleV Ahead eMMC and microSD
>       riscv: dts: thead: Enable LicheePi 4A eMMC and microSD
>
>  .../bindings/mmc/snps,dwcmshc-sdhci.yaml           |   1 +
>  arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts |  20 ++
>  .../boot/dts/thead/th1520-lichee-module-4a.dtsi    |  20 ++
>  arch/riscv/boot/dts/thead/th1520.dtsi              |  25 ++
>  arch/riscv/configs/defconfig                       |   2 +
>  drivers/mmc/host/sdhci-of-dwcmshc.c                | 349 +++++++++++++++++++++
>  drivers/mmc/host/sdhci.c                           |   3 +-
>  drivers/mmc/host/sdhci.h                           |   1 +
>  8 files changed, 420 insertions(+), 1 deletion(-)
> ---
> base-commit: 8cfd133bee055fb537d2338b808079a77de60052
> change-id: 20231031-th1520-mmc-b4e846fe6869
>
> Best regards,
> --
> Drew Fustini <dfustini at baylibre.com>
>