diff options
Diffstat (limited to 'arch/arm/cpu/armv7/omap5')
| -rw-r--r-- | arch/arm/cpu/armv7/omap5/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c | 139 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/omap5/prcm-regs.c | 3 |
3 files changed, 143 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/omap5/Makefile b/arch/arm/cpu/armv7/omap5/Makefile index 64c68791f1..e709f14a92 100644 --- a/arch/arm/cpu/armv7/omap5/Makefile +++ b/arch/arm/cpu/armv7/omap5/Makefile @@ -11,3 +11,4 @@ obj-y += sdram.o obj-y += prcm-regs.o obj-y += hw_data.o obj-y += abb.o +obj-$(CONFIG_IODELAY_RECALIBRATION) += dra7xx_iodelay.o diff --git a/arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c b/arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c new file mode 100644 index 0000000000..4b8ba26fd6 --- /dev/null +++ b/arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c @@ -0,0 +1,139 @@ +/* + * (C) Copyright 2015 + * Texas Instruments Incorporated, <www.ti.com> + * + * Lokesh Vutla <lokeshvutla@ti.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/utils.h> +#include <asm/arch/dra7xx_iodelay.h> +#include <asm/arch/omap.h> +#include <asm/arch/sys_proto.h> +#include <asm/arch/clock.h> +#include <asm/omap_common.h> + +static int isolate_io(u32 isolate) +{ + if (isolate) { + clrsetbits_le32((*ctrl)->control_pbias, SDCARD_PWRDNZ, + SDCARD_PWRDNZ); + clrsetbits_le32((*ctrl)->control_pbias, SDCARD_BIAS_PWRDNZ, + SDCARD_BIAS_PWRDNZ); + } + + /* Override control on ISOCLKIN signal to IO pad ring. */ + clrsetbits_le32((*prcm)->prm_io_pmctrl, PMCTRL_ISOCLK_OVERRIDE_MASK, + PMCTRL_ISOCLK_OVERRIDE_CTRL); + if (!wait_on_value(PMCTRL_ISOCLK_STATUS_MASK, PMCTRL_ISOCLK_STATUS_MASK, + (u32 *)(*prcm)->prm_io_pmctrl, LDELAY)) + return ERR_DEISOLATE_IO << isolate; + + /* Isolate/Deisolate IO */ + clrsetbits_le32((*ctrl)->ctrl_core_sma_sw_0, CTRL_ISOLATE_MASK, + isolate << CTRL_ISOLATE_SHIFT); + /* Dummy read to add delay t > 10ns */ + readl((*ctrl)->ctrl_core_sma_sw_0); + + /* Return control on ISOCLKIN to hardware */ + clrsetbits_le32((*prcm)->prm_io_pmctrl, PMCTRL_ISOCLK_OVERRIDE_MASK, + PMCTRL_ISOCLK_NOT_OVERRIDE_CTRL); + if (!wait_on_value(PMCTRL_ISOCLK_STATUS_MASK, + 0 << PMCTRL_ISOCLK_STATUS_SHIFT, + (u32 *)(*prcm)->prm_io_pmctrl, LDELAY)) + return ERR_DEISOLATE_IO << isolate; + + return 0; +} + +static int calibrate_iodelay(u32 base) +{ + u32 reg; + + /* Configure REFCLK period */ + reg = readl(base + CFG_REG_2_OFFSET); + reg &= ~CFG_REG_REFCLK_PERIOD_MASK; + reg |= CFG_REG_REFCLK_PERIOD; + writel(reg, base + CFG_REG_2_OFFSET); + + /* Initiate Calibration */ + clrsetbits_le32(base + CFG_REG_0_OFFSET, CFG_REG_CALIB_STRT_MASK, + CFG_REG_CALIB_STRT << CFG_REG_CALIB_STRT_SHIFT); + if (!wait_on_value(CFG_REG_CALIB_STRT_MASK, CFG_REG_CALIB_END, + (u32 *)(base + CFG_REG_0_OFFSET), LDELAY)) + return ERR_CALIBRATE_IODELAY; + + return 0; +} + +static int update_delay_mechanism(u32 base) +{ + /* Initiate the reload of calibrated values. */ + clrsetbits_le32(base + CFG_REG_0_OFFSET, CFG_REG_ROM_READ_MASK, + CFG_REG_ROM_READ_START); + if (!wait_on_value(CFG_REG_ROM_READ_MASK, CFG_REG_ROM_READ_END, + (u32 *)(base + CFG_REG_0_OFFSET), LDELAY)) + return ERR_UPDATE_DELAY; + + return 0; +} + +void __recalibrate_iodelay(struct pad_conf_entry const *pad, int npads) +{ + int ret = 0; + + /* IO recalibration should be done only from SRAM */ + if (OMAP_INIT_CONTEXT_SPL != omap_hw_init_context()) { + puts("IODELAY recalibration called from invalid context - use only from SPL in SRAM\n"); + return; + } + + /* unlock IODELAY CONFIG registers */ + writel(CFG_IODELAY_UNLOCK_KEY, (*ctrl)->iodelay_config_base + + CFG_REG_8_OFFSET); + + ret = calibrate_iodelay((*ctrl)->iodelay_config_base); + if (ret) + goto err; + + ret = isolate_io(ISOLATE_IO); + if (ret) + goto err; + + ret = update_delay_mechanism((*ctrl)->iodelay_config_base); + if (ret) + goto err; + + /* Configure Mux settings */ + do_set_mux32((*ctrl)->control_padconf_core_base, pad, npads); + + ret = isolate_io(DEISOLATE_IO); + +err: + /* lock IODELAY CONFIG registers */ + writel(CFG_IODELAY_LOCK_KEY, (*ctrl)->iodelay_config_base + + CFG_REG_8_OFFSET); + /* + * UART cannot be used during IO recalibration sequence as IOs are in + * isolation. So error handling and debug prints are done after + * complete IO delay recalibration sequence + */ + switch (ret) { + case ERR_CALIBRATE_IODELAY: + puts("IODELAY: IO delay calibration sequence failed\n"); + break; + case ERR_ISOLATE_IO: + puts("IODELAY: Isolation of Device IOs failed\n"); + break; + case ERR_UPDATE_DELAY: + puts("IODELAY: Delay mechanism update with new calibrated values failed\n"); + break; + case ERR_DEISOLATE_IO: + puts("IODELAY: De-isolation of Device IOs failed\n"); + break; + default: + debug("IODELAY: IO delay recalibration successfully completed\n"); + } +} diff --git a/arch/arm/cpu/armv7/omap5/prcm-regs.c b/arch/arm/cpu/armv7/omap5/prcm-regs.c index f80d36dc3c..0547037ff8 100644 --- a/arch/arm/cpu/armv7/omap5/prcm-regs.c +++ b/arch/arm/cpu/armv7/omap5/prcm-regs.c @@ -378,6 +378,7 @@ struct omap_sys_ctrl_regs const dra7xx_ctrl = { .control_status = 0x4A002134, .control_phy_power_usb = 0x4A002370, .control_phy_power_sata = 0x4A002374, + .ctrl_core_sma_sw_0 = 0x4A0023FC, .control_core_mac_id_0_lo = 0x4A002514, .control_core_mac_id_0_hi = 0x4A002518, .control_core_mac_id_1_lo = 0x4A00251C, @@ -457,6 +458,7 @@ struct omap_sys_ctrl_regs const dra7xx_ctrl = { .control_efuse_3 = 0x4AE0C5D0, .control_efuse_4 = 0x4AE0C5D4, .control_efuse_13 = 0x4AE0C5F0, + .iodelay_config_base = 0x4844A000, }; struct prcm_regs const omap5_es2_prcm = { @@ -976,6 +978,7 @@ struct prcm_regs const dra7xx_prcm = { .prm_rstctrl = 0x4ae07d00, .prm_rstst = 0x4ae07d04, .prm_rsttime = 0x4ae07d08, + .prm_io_pmctrl = 0x4ae07d20, .prm_vc_val_bypass = 0x4ae07da0, .prm_vc_cfg_i2c_mode = 0x4ae07db4, .prm_vc_cfg_i2c_clk = 0x4ae07db8, |