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[60.251.58.169]) by smtp.gmail.com with ESMTPSA id u8sm5336222pjn.24.2020.07.10.04.11.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jul 2020 04:11:42 -0700 (PDT) From: Ben Chuang To: adrian.hunter@intel.com, ulf.hansson@linaro.org Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, ben.chuang@genesyslogic.com.tw, takahiro.akashi@linaro.org, greg.tu@genesyslogic.com.tw, Ben Chuang Subject: [RFC PATCH V3 17/21] mmc: sdhci: UHS-II support, implement operations as a module Date: Fri, 10 Jul 2020 19:12:26 +0800 Message-Id: <20200710111226.29831-1-benchuanggli@gmail.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org From: AKASHI Takahiro All the UHS-II operations in struct sdhci_uhs2_ops are implemented here and exported as a kernel module. Signed-off-by: Ben Chuang Signed-off-by: AKASHI Takahiro --- drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-uhs2.c | 794 ++++++++++++++++++++++++++++++++++ 2 files changed, 795 insertions(+) create mode 100644 drivers/mmc/host/sdhci-uhs2.c -- 2.27.0 diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 4d5bcb0144a0..e51430d8f85d 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_MMC_PXA) += pxamci.o obj-$(CONFIG_MMC_MXC) += mxcmmc.o obj-$(CONFIG_MMC_MXS) += mxs-mmc.o obj-$(CONFIG_MMC_SDHCI) += sdhci.o +obj-$(CONFIG_MMC_SDHCI_UHS2) += sdhci-uhs2.o obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o sdhci-pci-y += sdhci-pci-core.o sdhci-pci-o2micro.o sdhci-pci-arasan.o \ sdhci-pci-dwc-mshc.o sdhci-pci-gli.o diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c new file mode 100644 index 000000000000..3cb13071dd9d --- /dev/null +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -0,0 +1,794 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * linux/drivers/mmc/host/sdhci_uhs2.c - Secure Digital Host Controller + * Interface driver + * + * Copyright (C) 2014 Intel Corp, All Rights Reserved. + * Copyright (C) 2020 Genesys Logic, Inc. + * Authors: Ben Chuang + * Copyright (C) 2020 Linaro Limited + * Author: AKASHI Takahiro + */ + +#include +#include +#include + +#include + +#include "sdhci.h" +#include "sdhci-uhs2.h" + +#define DRIVER_NAME "sdhci_uhs2" +#define DBG(f, x...) \ + pr_debug(DRIVER_NAME " [%s()]: " f, __func__, ## x) + +static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set) +{ + u32 ier; + + ier = sdhci_readl(host, SDHCI_INT_ENABLE); + ier &= ~clear; + ier |= set; + sdhci_writel(host, ier, SDHCI_INT_ENABLE); + sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE); +} + +/** + * sdhci_uhs2_clear_set_irqs - set Error Interrupt Status Enable register + * @host: SDHCI host + * @clear: bit-wise clear mask + * @set: bit-wise set mask + * + * Set/unset bits in UHS-II Error Interrupt Status Enable register + */ +void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set) +{ + u32 ier; + + ier = sdhci_readl(host, SDHCI_UHS2_ERR_INT_STATUS_EN); + ier &= ~clear; + ier |= set; + sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_STATUS_EN); + sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_SIG_EN); +} +EXPORT_SYMBOL_GPL(sdhci_uhs2_clear_set_irqs); + +/** + * sdhci_uhs2_reset - invoke SW reset + * @host: SDHCI host + * @mask: Control mask + * + * Invoke SW reset, depending on a bit in @mask and wait for completion. + */ +void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask) +{ + unsigned long timeout; + + if (!(host->mmc->caps & MMC_CAP_UHS2)) + return; + + sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET); + + if (mask & SDHCI_UHS2_SW_RESET_FULL) { + host->clock = 0; + /* Reset-all turns off SD Bus Power */ + if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) + sdhci_runtime_pm_bus_off(host); + } + + /* Wait max 100 ms */ + timeout = 10000; + + /* hw clears the bit when it's done */ + while (sdhci_readw(host, SDHCI_UHS2_SW_RESET) & mask) { + if (timeout == 0) { + pr_err("%s: %s: Reset 0x%x never completed.\n", + __func__, mmc_hostname(host->mmc), (int)mask); + pr_err("%s: clean reset bit\n", + mmc_hostname(host->mmc)); + sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET); + return; + } + timeout--; + udelay(10); + } +} +EXPORT_SYMBOL_GPL(sdhci_uhs2_reset); + +static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res, + u8 *dead_lock) +{ + u8 count; + unsigned int cmd_res_timeout, dead_lock_timeout, current_timeout; + + /* + * If the host controller provides us with an incorrect timeout + * value, just skip the check and use 0xE. The hardware may take + * longer to time out, but that's much better than having a too-short + * timeout value. + */ + if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) { + *cmd_res = 0xE; + *dead_lock = 0xE; + return 0xE; + } + + /* timeout in us */ + cmd_res_timeout = 5 * 1000; + dead_lock_timeout = 1 * 1000 * 1000; + + /* + * Figure out needed cycles. + * We do this in steps in order to fit inside a 32 bit int. + * The first step is the minimum timeout, which will have a + * minimum resolution of 6 bits: + * (1) 2^13*1000 > 2^22, + * (2) host->timeout_clk < 2^16 + * => + * (1) / (2) > 2^6 + */ + count = 0; + current_timeout = (1 << 13) * 1000 / host->timeout_clk; + while (current_timeout < cmd_res_timeout) { + count++; + current_timeout <<= 1; + if (count >= 0xF) + break; + } + + if (count >= 0xF) { + DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n", + mmc_hostname(host->mmc), count); + count = 0xE; + } + *cmd_res = count; + + count = 0; + current_timeout = (1 << 13) * 1000 / host->timeout_clk; + while (current_timeout < dead_lock_timeout) { + count++; + current_timeout <<= 1; + if (count >= 0xF) + break; + } + + if (count >= 0xF) { + DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n", + mmc_hostname(host->mmc), count); + count = 0xE; + } + *dead_lock = count; + + return count; +} + +static void sdhci_uhs2_set_timeout(struct sdhci_host *host) +{ + u8 cmd_res, dead_lock; + + sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock); + cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT; + sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL); +} + +static void sdhci_uhs2_set_transfer_mode(struct sdhci_host *host, + struct mmc_command *cmd) +{ + u16 mode; + struct mmc_data *data = cmd->data; + u16 arg; + + if (!data) { + /* clear Auto CMD settings for no data CMDs */ + arg = cmd->uhs2_cmd->arg; + if ((((arg & 0xF) << 8) | ((arg >> 8) & 0xFF)) == + UHS2_DEV_CMD_TRANS_ABORT) { + mode = 0; + } else { + mode = sdhci_readw(host, SDHCI_UHS2_TRANS_MODE); + if (cmd->opcode == MMC_STOP_TRANSMISSION || + cmd->opcode == MMC_ERASE) + mode |= SDHCI_UHS2_TRNS_WAIT_EBSY; + else + /* send status mode */ + if (cmd->opcode == MMC_SEND_STATUS) + mode = 0; + } + + if (IS_ENABLED(CONFIG_MMC_DEBUG)) + DBG("UHS2 no data trans mode is 0x%x.\n", mode); + + sdhci_writew(host, mode, SDHCI_UHS2_TRANS_MODE); + return; + } + + WARN_ON(!host->data); + + mode = SDHCI_UHS2_TRNS_BLK_CNT_EN | SDHCI_UHS2_TRNS_WAIT_EBSY; + if (data->flags & MMC_DATA_WRITE) + mode |= SDHCI_UHS2_TRNS_DATA_TRNS_WRT; + + if (data->blocks == 1 && + data->blksz != 512 && + cmd->opcode != MMC_READ_SINGLE_BLOCK && + cmd->opcode != MMC_WRITE_BLOCK) { + mode &= ~SDHCI_UHS2_TRNS_BLK_CNT_EN; + mode |= SDHCI_UHS2_TRNS_BLK_BYTE_MODE; + } + + if (host->flags & SDHCI_REQ_USE_DMA) + mode |= SDHCI_UHS2_TRNS_DMA; + + if ((host->mmc->flags & MMC_UHS2_2L_HD) && !cmd->uhs2_tmode0_flag) + mode |= SDHCI_UHS2_TRNS_2L_HD; + + sdhci_writew(host, mode, SDHCI_UHS2_TRANS_MODE); + + if (IS_ENABLED(CONFIG_MMC_DEBUG)) + DBG("UHS2 trans mode is 0x%x.\n", mode); +} + +static void sdhci_uhs2_send_command(struct sdhci_host *host, + struct mmc_command *cmd) +{ + int i, j; + int cmd_reg; + + if (host->mmc->flags & MMC_UHS2_INITIALIZED) { + if (!cmd->uhs2_cmd) { + pr_err("%s: fatal error, no uhs2_cmd!\n", + mmc_hostname(host->mmc)); + return; + } + } + + i = 0; + sdhci_writel(host, + ((u32)cmd->uhs2_cmd->arg << 16) | + (u32)cmd->uhs2_cmd->header, + SDHCI_UHS2_CMD_PACKET + i); + i += 4; + + /* + * Per spec, playload (config) should be MSB before sending out. + * But we don't need convert here because had set payload as + * MSB when preparing config read/write commands. + */ + for (j = 0; j < cmd->uhs2_cmd->payload_len / sizeof(u32); j++) { + sdhci_writel(host, *(cmd->uhs2_cmd->payload + j), + SDHCI_UHS2_CMD_PACKET + i); + i += 4; + } + + for ( ; i < SDHCI_UHS2_CMD_PACK_MAX_LEN; i += 4) + sdhci_writel(host, 0, SDHCI_UHS2_CMD_PACKET + i); + + if (IS_ENABLED(CONFIG_MMC_DEBUG)) { + DBG("UHS2 CMD packet_len = %d.\n", cmd->uhs2_cmd->packet_len); + for (i = 0; i < cmd->uhs2_cmd->packet_len; i++) + DBG("UHS2 CMD_PACKET[%d] = 0x%x.\n", i, + sdhci_readb(host, SDHCI_UHS2_CMD_PACKET + i)); + } + + cmd_reg = cmd->uhs2_cmd->packet_len << + SDHCI_UHS2_COMMAND_PACK_LEN_SHIFT; + if ((cmd->flags & MMC_CMD_MASK) == MMC_CMD_ADTC) + cmd_reg |= SDHCI_UHS2_COMMAND_DATA; + if (cmd->opcode == MMC_STOP_TRANSMISSION) + cmd_reg |= SDHCI_UHS2_COMMAND_CMD12; + + /* UHS2 Native ABORT */ + if ((cmd->uhs2_cmd->header & UHS2_NATIVE_PACKET) && + ((((cmd->uhs2_cmd->arg & 0xF) << 8) | + ((cmd->uhs2_cmd->arg >> 8) & 0xFF)) == UHS2_DEV_CMD_TRANS_ABORT)) + cmd_reg |= SDHCI_UHS2_COMMAND_TRNS_ABORT; + + /* UHS2 Native DORMANT */ + if ((cmd->uhs2_cmd->header & UHS2_NATIVE_PACKET) && + ((((cmd->uhs2_cmd->arg & 0xF) << 8) | + ((cmd->uhs2_cmd->arg >> 8) & 0xFF)) == + UHS2_DEV_CMD_GO_DORMANT_STATE)) + cmd_reg |= SDHCI_UHS2_COMMAND_DORMANT; + + DBG("0x%x is set to UHS2 CMD register.\n", cmd_reg); + + sdhci_writew(host, cmd_reg, SDHCI_UHS2_COMMAND); +} + +static void sdhci_uhs2_finish_command(struct sdhci_host *host) +{ + int i; + bool b_read_a0 = 0; + + if (host->mmc->flags & MMC_UHS2_INITIALIZED) { + u8 resp; + u8 ecode; + + resp = sdhci_readb(host, SDHCI_UHS2_RESPONSE + 2); + if (resp & UHS2_RES_NACK_MASK) { + ecode = (resp >> UHS2_RES_ECODE_POS) & + UHS2_RES_ECODE_MASK; + pr_err("%s: NACK is got, ECODE=0x%x.\n", + mmc_hostname(host->mmc), ecode); + } + b_read_a0 = 1; + } + + if (host->cmd->uhs2_resp && + host->cmd->uhs2_resp_len && + host->cmd->uhs2_resp_len <= 20) { + /* Get whole response of some native CCMD, like + * DEVICE_INIT, ENUMERATE. + */ + for (i = 0; i < host->cmd->uhs2_resp_len; i++) + host->cmd->uhs2_resp[i] = + sdhci_readb(host, + SDHCI_UHS2_RESPONSE + i); + } else { + /* Get SD CMD response and Payload for some read + * CCMD, like INQUIRY_CFG. + */ + /* Per spec (p136), payload field is divided into + * a unit of DWORD and transmission order within + * a DWORD is big endian. + */ + if (!b_read_a0) + sdhci_readl(host, SDHCI_UHS2_RESPONSE); + for (i = 4; i < 20; i += 4) { + host->cmd->resp[i / 4 - 1] = + (sdhci_readb(host, + SDHCI_UHS2_RESPONSE + i) << 24) | + (sdhci_readb(host, + SDHCI_UHS2_RESPONSE + i + 1) + << 16) | + (sdhci_readb(host, + SDHCI_UHS2_RESPONSE + i + 2) + << 8) | + sdhci_readb(host, SDHCI_UHS2_RESPONSE + i + 3); + } + } +} + +static void sdhci_uhs2_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios) +{ + u8 cmd_res, dead_lock; + u16 ctrl_2; + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + + /* UHS2 Timeout Control */ + sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock); + + /* change to use calculate value */ + cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT; + + sdhci_uhs2_clear_set_irqs(host, + SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT | + SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT, + 0); + sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL); + sdhci_uhs2_clear_set_irqs(host, 0, + SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT | + SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT); + + /* UHS2 timing */ + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (ios->timing == MMC_TIMING_UHS2) + ctrl_2 |= SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN; + else + ctrl_2 &= ~(SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN); + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); + + if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) + sdhci_enable_preset_value(host, true); + + /* Set VDD2 */ + ios->vdd = fls(host->mmc->ocr_avail) - 1; + ios->vdd2 = fls(host->mmc->ocr_avail_uhs2) - 1; + + sdhci_set_power(host, ios->power_mode, ios->vdd, ios->vdd2); + udelay(100); + + host->timing = ios->timing; + sdhci_set_clock(host, host->clock); + + spin_unlock_irqrestore(&host->lock, flags); +} + +static int sdhci_uhs2_interface_detect(struct sdhci_host *host) +{ + int timeout = 100; + + udelay(200); /* wait for 200us before check */ + + while (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & + SDHCI_UHS2_IF_DETECT)) { + if (timeout == 0) { + pr_warn("%s: not detect UHS2 interface in 200us.\n", + mmc_hostname(host->mmc)); + sdhci_dumpregs(host); + return -EIO; + } + timeout--; + mdelay(1); + } + + /* Enable UHS2 error interrupts */ + sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_ALL_MASK, + SDHCI_UHS2_ERR_INT_STATUS_MASK); + + timeout = 150; + while (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & + SDHCI_UHS2_LANE_SYNC)) { + if (timeout == 0) { + pr_warn("%s: UHS2 Lane sync fail in 150ms.\n", + mmc_hostname(host->mmc)); + sdhci_dumpregs(host); + return -EIO; + } + timeout--; + mdelay(1); + } + + DBG("%s: UHS2 Lane synchronized in UHS2 mode, PHY is initialized.\n", + mmc_hostname(host->mmc)); + return 0; +} + +static int sdhci_uhs2_init(struct sdhci_host *host) +{ + u16 caps_ptr = 0; + u32 caps_gen = 0; + u32 caps_phy = 0; + u32 caps_tran[2] = {0, 0}; + struct mmc_host *mmc = host->mmc; + + /* + * TODO: may add corresponding members in sdhci_host to + * keep these caps. + */ + caps_ptr = sdhci_readw(host, SDHCI_UHS2_HOST_CAPS_PTR); + if (caps_ptr < 0x100 || caps_ptr > 0x1FF) { + pr_err("%s: SDHCI_UHS2_HOST_CAPS_PTR(%d) is wrong.\n", + mmc_hostname(mmc), caps_ptr); + return -ENODEV; + } + caps_gen = sdhci_readl(host, + caps_ptr + SDHCI_UHS2_HOST_CAPS_GEN_OFFSET); + caps_phy = sdhci_readl(host, + caps_ptr + SDHCI_UHS2_HOST_CAPS_PHY_OFFSET); + caps_tran[0] = sdhci_readl(host, + caps_ptr + SDHCI_UHS2_HOST_CAPS_TRAN_OFFSET); + caps_tran[1] = sdhci_readl(host, + caps_ptr + + SDHCI_UHS2_HOST_CAPS_TRAN_1_OFFSET); + + /* General Caps */ + mmc->uhs2_caps.dap = caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_DAP_MASK; + mmc->uhs2_caps.gap = (caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_GAP_MASK) >> + SDHCI_UHS2_HOST_CAPS_GEN_GAP_SHIFT; + mmc->uhs2_caps.n_lanes = (caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_LANE_MASK) + >> SDHCI_UHS2_HOST_CAPS_GEN_LANE_SHIFT; + mmc->uhs2_caps.addr64 = + (caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_ADDR_64) ? 1 : 0; + mmc->uhs2_caps.card_type = + (caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_MASK) >> + SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_SHIFT; + + /* PHY Caps */ + mmc->uhs2_caps.phy_rev = caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_REV_MASK; + mmc->uhs2_caps.speed_range = + (caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_RANGE_MASK) + >> SDHCI_UHS2_HOST_CAPS_PHY_RANGE_SHIFT; + mmc->uhs2_caps.n_lss_sync = + (caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_SYN_MASK) + >> SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_SYN_SHIFT; + mmc->uhs2_caps.n_lss_dir = + (caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_DIR_MASK) + >> SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_DIR_SHIFT; + if (mmc->uhs2_caps.n_lss_sync == 0) + mmc->uhs2_caps.n_lss_sync = 16 << 2; + else + mmc->uhs2_caps.n_lss_sync <<= 2; + if (mmc->uhs2_caps.n_lss_dir == 0) + mmc->uhs2_caps.n_lss_dir = 16 << 3; + else + mmc->uhs2_caps.n_lss_dir <<= 3; + + /* LINK/TRAN Caps */ + mmc->uhs2_caps.link_rev = + caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_LINK_REV_MASK; + mmc->uhs2_caps.n_fcu = + (caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_N_FCU_MASK) + >> SDHCI_UHS2_HOST_CAPS_TRAN_N_FCU_SHIFT; + if (mmc->uhs2_caps.n_fcu == 0) + mmc->uhs2_caps.n_fcu = 256; + mmc->uhs2_caps.host_type = + (caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_HOST_TYPE_MASK) + >> SDHCI_UHS2_HOST_CAPS_TRAN_HOST_TYPE_SHIFT; + mmc->uhs2_caps.maxblk_len = + (caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_BLK_LEN_MASK) + >> SDHCI_UHS2_HOST_CAPS_TRAN_BLK_LEN_SHIFT; + mmc->uhs2_caps.n_data_gap = + caps_tran[1] & SDHCI_UHS2_HOST_CAPS_TRAN_1_N_DATA_GAP_MASK; + + return 0; +} + +static int sdhci_uhs2_do_detect_init(struct sdhci_host *host) +{ + unsigned long flags; + int ret = -EIO; + + DBG("%s: begin UHS2 init.\n", __func__); + spin_lock_irqsave(&host->lock, flags); + + if (sdhci_uhs2_interface_detect(host)) { + pr_warn("%s: cannot detect UHS2 interface.\n", + mmc_hostname(host->mmc)); + goto out; + } + + if (sdhci_uhs2_init(host)) { + pr_warn("%s: UHS2 init fail.\n", mmc_hostname(host->mmc)); + goto out; + } + + /* Init complete, do soft reset and enable UHS2 error irqs. */ + sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_SD); + sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_ALL_MASK, + SDHCI_UHS2_ERR_INT_STATUS_MASK); + /* + * !!! SDHCI_INT_ENABLE and SDHCI_SIGNAL_ENABLE was cleared + * by SDHCI_UHS2_SW_RESET_SD + */ + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); + + ret = 0; +out: + spin_unlock_irqrestore(&host->lock, flags); + return ret; +} + +static void sdhci_uhs2_set_config(struct sdhci_host *host) +{ + u32 value; + u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SET_PTR); + u16 sdhci_uhs2_gen_set_reg = (sdhci_uhs2_set_ptr + 0); + u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4); + u16 sdhci_uhs2_tran_set_reg = (sdhci_uhs2_set_ptr + 8); + u16 sdhci_uhs2_tran_set_1_reg = (sdhci_uhs2_set_ptr + 12); + + /* Set Gen Settings */ + sdhci_writel(host, host->mmc->uhs2_caps.n_lanes_set << + SDHCI_UHS2_GEN_SET_N_LANES_POS, sdhci_uhs2_gen_set_reg); + + /* Set PHY Settings */ + value = (host->mmc->uhs2_caps.n_lss_dir_set << + SDHCI_UHS2_PHY_SET_N_LSS_DIR_POS) | + (host->mmc->uhs2_caps.n_lss_sync_set << + SDHCI_UHS2_PHY_SET_N_LSS_SYN_POS); + if (host->mmc->flags & MMC_UHS2_SPEED_B) + value |= 1 << SDHCI_UHS2_PHY_SET_SPEED_POS; + sdhci_writel(host, value, sdhci_uhs2_phy_set_reg); + + /* Set LINK-TRAN Settings */ + value = (host->mmc->uhs2_caps.max_retry_set << + SDHCI_UHS2_TRAN_SET_RETRY_CNT_POS) | + (host->mmc->uhs2_caps.n_fcu_set << + SDHCI_UHS2_TRAN_SET_N_FCU_POS); + sdhci_writel(host, value, sdhci_uhs2_tran_set_reg); + sdhci_writel(host, host->mmc->uhs2_caps.n_data_gap_set, + sdhci_uhs2_tran_set_1_reg); +} + +static int sdhci_uhs2_check_dormant(struct sdhci_host *host) +{ + int timeout = 100; + + while (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & + SDHCI_UHS2_IN_DORMANT_STATE)) { + if (timeout == 0) { + pr_warn("%s: UHS2 IN_DORMANT fail in 100ms.\n", + mmc_hostname(host->mmc)); + sdhci_dumpregs(host); + return -EIO; + } + timeout--; + mdelay(1); + } + return 0; +} + +static int sdhci_uhs2_do_set_reg(struct sdhci_host *host, enum uhs2_act act) +{ + unsigned long flags; + int err = 0; + u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SET_PTR); + u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4); + + DBG("Begin sdhci_uhs2_set_reg, act %d.\n", act); + spin_lock_irqsave(&host->lock, flags); + + switch (act) { + case SET_CONFIG: + sdhci_uhs2_set_config(host); + break; + case ENABLE_INT: + sdhci_clear_set_irqs(host, 0, SDHCI_INT_CARD_INT); + break; + case DISABLE_INT: + sdhci_clear_set_irqs(host, SDHCI_INT_CARD_INT, 0); + break; + case SET_SPEED_B: + sdhci_writeb(host, 1 << SDHCI_UHS2_PHY_SET_SPEED_POS, + sdhci_uhs2_phy_set_reg); + break; + case CHECK_DORMANT: + err = sdhci_uhs2_check_dormant(host); + break; + default: + pr_err("%s: input action %d is wrong!\n", + mmc_hostname(host->mmc), act); + err = -EIO; + break; + } + + spin_unlock_irqrestore(&host->lock, flags); + return err; +} + +static void sdhci_uhs2_irq(struct sdhci_host *host) +{ + u32 uhs2mask; + struct mmc_command *cmd = host->cmd; + + uhs2mask = sdhci_readl(host, SDHCI_UHS2_ERR_INT_STATUS); + DBG("*** %s got UHS2 interrupt: 0x%08x\n", + mmc_hostname(host->mmc), uhs2mask); + + sdhci_writel(host, uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_MASK, + SDHCI_UHS2_ERR_INT_STATUS); + + if (!(uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_MASK)) + return; + + if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_CMD_MASK) { + if (!host->cmd) { + pr_err("%s: Got cmd interrupt 0x%08x but no cmd.\n", + mmc_hostname(host->mmc), + (unsigned int)uhs2mask); + sdhci_dumpregs(host); + return; + } + host->cmd->error = -EILSEQ; + if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT) + host->cmd->error = -ETIMEDOUT; + } + + if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_DATA_MASK) { + if (!host->data) { + pr_err("%s: Got data interrupt 0x%08x but no data.\n", + mmc_hostname(host->mmc), + (unsigned int)uhs2mask); + sdhci_dumpregs(host); + return; + } + + if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT) { + pr_err("%s: Got deadlock timeout interrupt 0x%08x\n", + mmc_hostname(host->mmc), + (unsigned int)uhs2mask); + host->data->error = -ETIMEDOUT; + } else if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_ADMA) { + pr_err("%s: ADMA error = 0x %x\n", + mmc_hostname(host->mmc), + sdhci_readb(host, SDHCI_ADMA_ERROR)); + host->data->error = -EIO; + } else { + host->data->error = -EILSEQ; + } + } + + if (host->data && host->data->error) + sdhci_finish_data(host); + else + sdhci_finish_mrq(host, cmd->mrq); +} + +static int sdhci_uhs2_add_host(struct sdhci_host *host, u32 caps1) +{ + struct mmc_host *mmc; + u32 max_current_caps2; + + if (host->version < SDHCI_SPEC_400) + return 0; + + mmc = host->mmc; + + /* Support UHS2 */ + if (caps1 & SDHCI_SUPPORT_UHS2) { + mmc->caps |= MMC_CAP_UHS2; + mmc->flags |= MMC_UHS2_SUPPORT; + } + + max_current_caps2 = sdhci_readl(host, SDHCI_MAX_CURRENT_1); + + if ((caps1 & SDHCI_SUPPORT_VDD2_180) && + !max_current_caps2 && + !IS_ERR(mmc->supply.vmmc2)) { + /* UHS2 - VDD2 */ + int curr = regulator_get_current_limit(mmc->supply.vmmc2); + + if (curr > 0) { + /* convert to SDHCI_MAX_CURRENT format */ + curr = curr / 1000; /* convert to mA */ + curr = curr / SDHCI_MAX_CURRENT_MULTIPLIER; + curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT); + max_current_caps2 = curr; + } + } + + if (caps1 & SDHCI_SUPPORT_VDD2_180) { + mmc->ocr_avail_uhs2 |= MMC_VDD2_165_195; + /* + * UHS2 doesn't require this. Only UHS-I bus needs to set + * max current. + */ + mmc->max_current_180_vdd2 = (max_current_caps2 & + SDHCI_MAX_CURRENT_VDD2_180_MASK) * + SDHCI_MAX_CURRENT_MULTIPLIER; + } else { + mmc->caps &= ~MMC_CAP_UHS2; + mmc->flags &= ~MMC_UHS2_SUPPORT; + } + + return 0; +} + +static void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead) +{ + if (!(host->mmc) || !(host->mmc->flags & MMC_UHS2_SUPPORT)) + return; + + if (!dead) + sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_FULL); + + sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_STATUS_EN); + sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_SIG_EN); + host->mmc->flags &= ~MMC_UHS2_SUPPORT; + host->mmc->flags &= ~MMC_UHS2_INITIALIZED; +} + +static int __init sdhci_uhs2_host_init(void) +{ + sdhci_uhs2_ops.reset = sdhci_uhs2_reset; + sdhci_uhs2_ops.set_timeout = sdhci_uhs2_set_timeout; + sdhci_uhs2_ops.set_transfer_mode = sdhci_uhs2_set_transfer_mode; + sdhci_uhs2_ops.send_command = sdhci_uhs2_send_command; + sdhci_uhs2_ops.finish_command = sdhci_uhs2_finish_command; + sdhci_uhs2_ops.do_set_ios = sdhci_uhs2_do_set_ios; + sdhci_uhs2_ops.do_detect_init = sdhci_uhs2_do_detect_init; + sdhci_uhs2_ops.do_set_reg = sdhci_uhs2_do_set_reg; + sdhci_uhs2_ops.irq = sdhci_uhs2_irq; + sdhci_uhs2_ops.add_host = sdhci_uhs2_add_host; + sdhci_uhs2_ops.remove_host = sdhci_uhs2_remove_host; + + return 0; +} +module_init(sdhci_uhs2_host_init); + +static void __exit sdhci_uhs2_exit(void) +{ + struct sdhci_uhs2_ops nops = {}; + + sdhci_uhs2_ops = nops; +} +module_exit(sdhci_uhs2_exit); + +MODULE_AUTHOR("Intel, Genesys Logic, Linaro"); +MODULE_DESCRIPTION("MMC UHS-II Support"); +MODULE_LICENSE("GPL v2");