Re: [U-Boot] [PATCH 07/10] ufs: Add glue layer driver for TI J721E devices
Vignesh, On 10/09/19 9:18 AM, Vignesh Raghavendra wrote: > > > On 09/09/19 1:49 PM, Faiz Abbas wrote: >> Add glue layer driver for the controller present on TI's J721E devices. >> >> Signed-off-by: Faiz Abbas >> --- >> drivers/ufs/Kconfig| 6 +++ >> drivers/ufs/Makefile | 1 + >> drivers/ufs/ti-j721e-ufs.c | 75 ++ >> 3 files changed, 82 insertions(+) >> create mode 100644 drivers/ufs/ti-j721e-ufs.c >> >> diff --git a/drivers/ufs/Kconfig b/drivers/ufs/Kconfig >> index a320b4561f..4875e9448e 100644 >> --- a/drivers/ufs/Kconfig >> +++ b/drivers/ufs/Kconfig >> @@ -14,4 +14,10 @@ config CADENCE_UFS >>This selects the platform driver for the Cadence UFS host >>controller present on present TI's J721e devices. >> >> +config TI_J721E_UFS >> +bool "Glue Layer driver for UFS on TI J721E devices" >> +help >> + This selects the glue layer driver for Cadence controller >> + present on TI's J721E devices. >> + >> endmenu >> diff --git a/drivers/ufs/Makefile b/drivers/ufs/Makefile >> index 9262bd6cd0..62ed016608 100644 >> --- a/drivers/ufs/Makefile >> +++ b/drivers/ufs/Makefile >> @@ -5,3 +5,4 @@ >> >> obj-$(CONFIG_UFS) += ufs.o ufs-uclass.o >> obj-$(CONFIG_CADENCE_UFS) += cdns-platform.o >> +obj-$(CONFIG_TI_J721E_UFS) += ti-j721e-ufs.o >> diff --git a/drivers/ufs/ti-j721e-ufs.c b/drivers/ufs/ti-j721e-ufs.c >> new file mode 100644 >> index 00..249d3796c0 >> --- /dev/null >> +++ b/drivers/ufs/ti-j721e-ufs.c >> @@ -0,0 +1,75 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ >> + */ >> + >> +#include >> +#include >> +#include >> +#include > > #include > > should be sufficient instead of two includes. Replaced it. > >> +#include >> +#include >> + >> +#define UFS_SS_CTRL 0x4 >> +#define UFS_SS_RST_N_PCSBIT(0) >> +#define UFS_SS_CLK_26MHZBIT(4) >> + >> +static int ti_j721e_ufs_probe(struct udevice *dev) >> +{ >> +struct power_domain ufs_pwrdmn; >> +struct regmap *map; >> +unsigned int clock; >> +struct clk clk; >> +u32 reg = 0; >> +int ret; >> + >> +ret = power_domain_get(dev, _pwrdmn); >> +if (ret) { >> +dev_err(dev, "failed to get power domain %d\n", ret); >> +return ret; >> +} >> + >> +ret = power_domain_on(_pwrdmn); >> +if (ret) { >> +dev_err(dev, "Power domain on failed\n"); >> +return ret; >> +} > > Core takes care of enabling power domain before calling probe. So this > can be dropped Ok. > >> + >> +ret = regmap_init_mem(dev_ofnode(dev), ); >> +if (ret) >> +return ret; >> + > > > I think regmap is an overkill here.. We are just accessing a single > register and within dedicated wrapper space. Just use regular IO accessors. Ok. Going back to writel/readl calls. > > > >> +ret = clk_get_by_index(dev, 0, ); >> +if (ret) { >> +dev_err(dev, "failed to get M-PHY clock\n"); >> +return ret; >> +} >> + >> +clock = clk_get_rate(); >> +if (IS_ERR_VALUE(clock)) { >> +dev_err(dev, "failed to get rate\n"); >> +return ret; >> +} >> + >> +if (clock == 2600) >> +reg |= UFS_SS_CLK_26MHZ; >> +/* Take UFS slave device out of reset */ >> +reg |= UFS_SS_RST_N_PCS; >> +regmap_write(map, UFS_SS_CTRL, reg); >> + > > To be safe, put the slave back to reset before jumping to kernel so that > card does not see any glitches when kernel is doing any > re-initialization of clocks etc. > This can be done in driver remove callback (and needs DM_FLAG_OS_PREPARE > flag to be set in driver declaration) Implemented this for v2. Thanks. Regards, Faiz ___ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
Re: [U-Boot] [PATCH 07/10] ufs: Add glue layer driver for TI J721E devices
On 09/09/19 1:49 PM, Faiz Abbas wrote: > Add glue layer driver for the controller present on TI's J721E devices. > > Signed-off-by: Faiz Abbas > --- > drivers/ufs/Kconfig| 6 +++ > drivers/ufs/Makefile | 1 + > drivers/ufs/ti-j721e-ufs.c | 75 ++ > 3 files changed, 82 insertions(+) > create mode 100644 drivers/ufs/ti-j721e-ufs.c > > diff --git a/drivers/ufs/Kconfig b/drivers/ufs/Kconfig > index a320b4561f..4875e9448e 100644 > --- a/drivers/ufs/Kconfig > +++ b/drivers/ufs/Kconfig > @@ -14,4 +14,10 @@ config CADENCE_UFS > This selects the platform driver for the Cadence UFS host > controller present on present TI's J721e devices. > > +config TI_J721E_UFS > + bool "Glue Layer driver for UFS on TI J721E devices" > + help > + This selects the glue layer driver for Cadence controller > + present on TI's J721E devices. > + > endmenu > diff --git a/drivers/ufs/Makefile b/drivers/ufs/Makefile > index 9262bd6cd0..62ed016608 100644 > --- a/drivers/ufs/Makefile > +++ b/drivers/ufs/Makefile > @@ -5,3 +5,4 @@ > > obj-$(CONFIG_UFS) += ufs.o ufs-uclass.o > obj-$(CONFIG_CADENCE_UFS) += cdns-platform.o > +obj-$(CONFIG_TI_J721E_UFS) += ti-j721e-ufs.o > diff --git a/drivers/ufs/ti-j721e-ufs.c b/drivers/ufs/ti-j721e-ufs.c > new file mode 100644 > index 00..249d3796c0 > --- /dev/null > +++ b/drivers/ufs/ti-j721e-ufs.c > @@ -0,0 +1,75 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ > + */ > + > +#include > +#include > +#include > +#include #include should be sufficient instead of two includes. > +#include > +#include > + > +#define UFS_SS_CTRL 0x4 > +#define UFS_SS_RST_N_PCSBIT(0) > +#define UFS_SS_CLK_26MHZBIT(4) > + > +static int ti_j721e_ufs_probe(struct udevice *dev) > +{ > + struct power_domain ufs_pwrdmn; > + struct regmap *map; > + unsigned int clock; > + struct clk clk; > + u32 reg = 0; > + int ret; > + > + ret = power_domain_get(dev, _pwrdmn); > + if (ret) { > + dev_err(dev, "failed to get power domain %d\n", ret); > + return ret; > + } > + > + ret = power_domain_on(_pwrdmn); > + if (ret) { > + dev_err(dev, "Power domain on failed\n"); > + return ret; > + } Core takes care of enabling power domain before calling probe. So this can be dropped > + > + ret = regmap_init_mem(dev_ofnode(dev), ); > + if (ret) > + return ret; > + I think regmap is an overkill here.. We are just accessing a single register and within dedicated wrapper space. Just use regular IO accessors. > + ret = clk_get_by_index(dev, 0, ); > + if (ret) { > + dev_err(dev, "failed to get M-PHY clock\n"); > + return ret; > + } > + > + clock = clk_get_rate(); > + if (IS_ERR_VALUE(clock)) { > + dev_err(dev, "failed to get rate\n"); > + return ret; > + } > + > + if (clock == 2600) > + reg |= UFS_SS_CLK_26MHZ; > + /* Take UFS slave device out of reset */ > + reg |= UFS_SS_RST_N_PCS; > + regmap_write(map, UFS_SS_CTRL, reg); > + To be safe, put the slave back to reset before jumping to kernel so that card does not see any glitches when kernel is doing any re-initialization of clocks etc. This can be done in driver remove callback (and needs DM_FLAG_OS_PREPARE flag to be set in driver declaration) > + return dm_scan_fdt_dev(dev); > +} > + > +static const struct udevice_id ti_j721e_ufs_ids[] = { > + { > + .compatible = "ti,j721e-ufs", > + }, > + {}, > +}; > + > +U_BOOT_DRIVER(ti_j721e_ufs) = { > + .name = "ti-j721e-ufs", > + .id = UCLASS_UFS, > + .of_match = ti_j721e_ufs_ids, > + .probe = ti_j721e_ufs_probe, > +}; > -- Regards Vignesh ___ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot