[PATCH v8 0/4] RISC-V: Add MMC support for TH1520 boards

Drew Fustini
2023-12-06T08:10:01Z

This series enables the MMC controller in the T-Head TH1520 SoC and
enables the eMMC and microSD on both the BeagleV Ahead and the Sipeed
LicheePi 4A.

The drivers/mmc/host patches from v6 were applied by Ulf and are already
in the linux-next [1][2] as well as the bindings patch [3]. Thus v7 was
only a defconfig patch and three device tree patches. This v8 is a
followup to change the dwcmshc node names to match the documentation.

Jisheng - can you apply the dts patches to your for-next tree?

I tested with the riscv defconfig on the Ahead [4] and LPi4a [5]. I only
tested eMMC and microSD and plan to enable SDIO WiFi in the future.

References:
[1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=49f23745b064cdb6270402403ef58125d78ba183
[2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=aff35fbc7830510ef7cbcf8e32a041a55de3dc51
[3] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=af076680db846ed54b00b9a763473d1043446993
[4] https://gist.github.com/pdp7/881342620ec1509685f23a387e2fc8d7
[5] https://gist.github.com/pdp7/97017ad88d83fccac18eba69bff817b7

Changes in PATCH v8:
- change dwcmshc node labels to match TH1520 System Reference Manual:
emmc, sdio0, sdio1

Changes in PATCH v7:
//lore.kernel.org/r/20231129-th1520_mmc_dts-v7-0-c77fc19caa6f@baylibre.com
- fix sorting of DT properties in the mmc nodes

Changes in PATCH v6:
https://lore.kernel.org/linux-riscv/20231114-th1520-mmc-v6-0-3273c661a571@baylibre.com/
- set the mmc nodes to disabled in the th1520.dtsi

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@baylibre.com>
---
Drew Fustini (4):
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

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 | 34 ++++++++++++++++++++++
arch/riscv/configs/defconfig | 2 ++
4 files changed, 76 insertions(+)
---
base-commit: 1f5c003694fab4b1ba6cbdcc417488b975c088d0
change-id: 20231129-th1520_mmc_dts-e472bcc70d0d

Best regards,
--
Drew Fustini <dfustini@baylibre.com>