Bring 64-bit support to dw_mmc core and Exynos dw_mmc drivers, and enable it on E850-96 board. Additionally do some related cleanups and device tree updates.
64-bit version of DesignWare MMC can be often found on modern ARM64 chips. It's different from its older 32-bit version (which is already implemented in U-Boot): some new registers were added, existing register addresses are changed, DMA descriptor table is different, etc.
Exynos DW MMC driver was updated too: ARM64 Exynos chips implement their clock drivers using CCF framework, pinmux configuration is done at startup in DM capable pinctrl drivers, device tree properties were changed w.r.t. their upstream (Linux kernel) counterparts. CLKSEL register address is also different on 64-bit Exynos platforms.
The patch series was tested on E850-96 board by running mainline Linux kernel with Debian rootfs from eMMC ("boot" partition) with these commands:
8<-------------------------------------------------------------------->8 env set fdtaddr 0x8a000000 env set bootaddr 0x94000000 env set boot_kerneladdr 0x94000800 part start mmc 0 boot boot_start part size mmc 0 boot boot_size mmc read $bootaddr $boot_start $boot_size abootimg addr $bootaddr abootimg get dtb --index=0 dtb_start dtb_size cp.b $dtb_start $fdtaddr $dtb_size fdt addr $fdtaddr 0x100000 cp.b $boot_kerneladdr $loadaddr 2aaaa00 env set bootargs console=ttySAC0,115200n8 printk.devkmsg=on \ root=/dev/mmcblk0p12 rootwait rw booti $loadaddr - $fdtaddr 8<-------------------------------------------------------------------->8
For E850-96 eMMC to function properly in DDR mode, the pending patch [1] has to be applied. Otherwise it won't be possible for exynos_dw_mmc driver to change CIU clock rate from 200 MHz up to 400 MHz, and MMC will fall back to SDR mode, which makes eMMC throughput twice as slower. With patch [1] applied, 'mmc info' reports this:
Bus Speed: 52000000 Mode: MMC DDR52 (52MHz)
and 'clk dump' shows CIU clock rate to be ~400 MHz (after first mmc operation, e.g. 'part start' or 'mmc read'):
399750000 gout_mmc_embd_sdclkin
Which makes sense, because dw_mmc requests to set CCLKIN = 52 MHz (with DDR/8-bit mode), and exynos_dw_mmc tries to set CIU clock rate to:
SDCLKIN = 2 * ciu_div * CCLKIN = 2 * 4 * 52 MHz = 416 MHz,
and the closest possible value the clock driver can set is 399.75 MHz, which works just fine.
For Exynos4 and Exynos5 (ARM32) boards, this patch series was only build tested (manually and with buildman). The build is clean (no errors or warnings), but I don't have any Exynos4/Exynos5 boards at my disposal, so I can't actually verify MMC operation there.
[1] https://lists.denx.de/pipermail/u-boot/2024-March/547719.html
Sam Protsenko (42): mmc: dw_mmc: Remove common.h mmc: dw_mmc: Remove unused version field from struct dwmci_host mmc: dw_mmc: Move struct idmac to dw_mmc.c mmc: dw_mmc: Extract waiting for data busy into a separate routine mmc: dw_mmc: Extract FIFO init into a separate routine mmc: dw_mmc: Extract clock on/off code into a separate routine mmc: dw_mmc: Extract FIFO data transfer into a separate routine mmc: dw_mmc: Extract DMA transfer handling code into a separate routine mmc: dw_mmc: Extract setting the DMA descriptor into a separate routine mmc: dw_mmc: Improve 32-bit IDMAC descriptor namings mmc: dw_mmc: Add support for 64-bit IDMAC mmc: dw_mmc: Replace fifoth_val property with fifo-depth mmc: dw_mmc: Fix kernel-doc comments in dwmmc.h mmc: dw_mmc: Use CONFIG_IS_ENABLED() to check config options mmc: dw_mmc: Improve coding style arm: dts: exynos: Add upstream DW MMC properties to all Exynos dts dt-bindings: exynos: Update bindings doc for DW MMC controller arm: exynos: Add header guard for dwmmc.h mmc: exynos_dw_mmc: Fix obtaining the base address of controller mmc: exynos_dw_mmc: Fix getting private data in exynos_dwmci_board_init() mmc: exynos_dw_mmc: Don't call pinmux functions on ARM64 chips mmc: exynos_dw_mmc: Obtain and use CIU clock via CCF API mmc: exynos_dw_mmc: Use .of_to_plat for device tree parsing mmc: exynos_dw_mmc: Convert to use livetree API mmc: exynos_dw_mmc: Read upstream SDR timing properties mmc: exynos_dw_mmc: Abstract CLKSEL register mmc: exynos_dw_mmc: Refactor fixed CIU clock divider mmc: exynos_dw_mmc: Read common bus-width property mmc: exynos_dw_mmc: Read common clock-frequency property mmc: exynos_dw_mmc: Move quirks from struct dwmci_host to chip data mmc: exynos_dw_mmc: Read and use DDR timing when available mmc: exynos_dw_mmc: Set requested freq in get_mmc_clk() callback mmc: exynos_dw_mmc: Add support for ARM64 Exynos chips mmc: exynos_dw_mmc: Remove common.h mmc: exynos_dw_mmc: Use CONFIG_IS_ENABLED() to check config options mmc: exynos_dw_mmc: Pull all init code into probe function mmc: exynos_dw_mmc: Don't call dwmci_setup_cfg() after add_dwmci() mmc: exynos_dw_mmc: Use dev->name as driver's displayed name mmc: exynos_dw_mmc: Improve coding style arm: dts: exynos: Remove outdated DW MMC properties in all Exynos dts configs: e850-96: Enable MMC doc: samsung: Mention enabled eMMC in E850-96 board doc
arch/arm/dts/exynos4210-origen.dts | 3 +- arch/arm/dts/exynos4210-trats.dts | 6 +- arch/arm/dts/exynos4210-universal_c210.dts | 6 +- arch/arm/dts/exynos4412-odroid.dts | 14 +- arch/arm/dts/exynos4412-trats2.dts | 20 +- arch/arm/dts/exynos5250-arndale.dts | 10 +- arch/arm/dts/exynos5250-smdk5250.dts | 13 +- arch/arm/dts/exynos5250-snow.dts | 13 +- arch/arm/dts/exynos5250-spring.dts | 7 +- arch/arm/dts/exynos5420-smdk5420.dts | 13 +- arch/arm/dts/exynos5422-odroidxu3.dts | 4 +- arch/arm/dts/exynos54xx.dtsi | 13 +- arch/arm/mach-exynos/include/mach/dwmmc.h | 40 +- configs/e850-96_defconfig | 10 +- doc/board/samsung/e850-96.rst | 5 +- doc/device-tree-bindings/exynos/dwmmc.txt | 46 +- drivers/mmc/ca_dw_mmc.c | 2 +- drivers/mmc/dw_mmc.c | 535 +++++++++++++-------- drivers/mmc/exynos_dw_mmc.c | 362 +++++++++----- drivers/mmc/ftsdc010_mci.h | 1 - drivers/mmc/hi6220_dw_mmc.c | 7 +- drivers/mmc/nexell_dw_mmc.c | 5 +- drivers/mmc/rockchip_dw_mmc.c | 5 +- drivers/mmc/s5p_sdhci.c | 2 +- drivers/mmc/snps_dw_mmc.c | 6 +- drivers/mmc/socfpga_dw_mmc.c | 4 +- include/dwmmc.h | 246 +++++----- 27 files changed, 858 insertions(+), 540 deletions(-)