[PATCH RFC 07/10] mmc: cmdq: support for command queue enabled host

Ritesh Harjani
2016-06-15T13:02:58Z

From: Venkat Gopalakrishnan <venkatg@codeaurora.org>

This patch adds CMDQ support for command-queue compatible
hosts.

Command queue is added in eMMC-5.1 specification. This
enables the controller to process upto 32 requests at
a time.

Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[riteshh@codeaurora.org: fixed merge conflicts]
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
---
drivers/mmc/host/Kconfig | 13 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/cmdq_hci.c | 656 ++++++++++++++++++++++++++++++++++++++++++++
drivers/mmc/host/cmdq_hci.h | 211 ++++++++++++++
include/linux/mmc/host.h | 12 +
5 files changed, 893 insertions(+)
create mode 100644 drivers/mmc/host/cmdq_hci.c
create mode 100644 drivers/mmc/host/cmdq_hci.h

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index e657af0..f1b5433 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -774,6 +774,19 @@ config MMC_SUNXI
This selects support for the SD/MMC Host Controller on
Allwinner sunxi SoCs.

+config MMC_CQ_HCI
+ tristate "Command Queue Support"
+ depends on HAS_DMA
+ help
+ This selects the Command Queue Host Controller Interface (CQHCI)
+ support present in host controllers of Qualcomm Technologies, Inc
+ amongst others.
+ This controller supports eMMC devices with command queue support.
+
+ If you have a controller with this interface, say Y or M here.
+
+ If unsure, say N.
+
config MMC_TOSHIBA_PCI
tristate "Toshiba Type A SD/MMC Card Interface Driver"
depends on PCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index af918d2..3715f73 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -76,6 +76,7 @@ obj-$(CONFIG_MMC_SDHCI_IPROC) += sdhci-iproc.o
obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o
obj-$(CONFIG_MMC_SDHCI_ST) += sdhci-st.o
obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32) += sdhci-pic32.o
+obj-$(CONFIG_MMC_CQ_HCI) += cmdq_hci.o

ifeq ($(CONFIG_CB710_DEBUG),y)
CFLAGS-cb710-mmc += -DDEBUG
diff --git a/drivers/mmc/host/cmdq_hci.c b/drivers/mmc/host/cmdq_hci.c
new file mode 100644
index 0000000..68c8e03
--- /dev/null
+++ b/drivers/mmc/host/cmdq_hci.c
@@ -0,0 +1,656 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/scatterlist.h>
+#include <linux/platform_device.h>
+#include <linux/blkdev.h>
+
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+
+#include "cmdq_hci.h"
+
+#define DCMD_SLOT 31
+#define NUM_SLOTS 32
+
+static inline u8 *get_desc(struct cmdq_host *cq_host, u8 tag)
+{
+ return cq_host->desc_base + (tag * cq_host->slot_sz);
+}
+
+static inline u8 *get_link_desc(struct cmdq_host *cq_host, u8 tag)
+{
+ u8 *desc = get_desc(cq_host, tag);
+
+ return desc + cq_host->task_desc_len;
+}
+
+static inline dma_addr_t get_trans_desc_dma(struct cmdq_host *cq_host, u8 tag)
+{
+ return cq_host->trans_desc_dma_base +
+ (cq_host->mmc->max_segs * tag *
+ cq_host->trans_desc_len);
+}
+
+static inline u8 *get_trans_desc(struct cmdq_host *cq_host, u8 tag)
+{
+ return cq_host->trans_desc_base +
+ (cq_host->trans_desc_len * cq_host->mmc->max_segs * tag);
+}
+
+static void setup_trans_desc(struct cmdq_host *cq_host, u8 tag)
+{
+ u8 *link_temp;
+ dma_addr_t trans_temp;
+
+ link_temp = get_link_desc(cq_host, tag);
+ trans_temp = get_trans_desc_dma(cq_host, tag);
+
+ memset(link_temp, 0, cq_host->link_desc_len);
+ if (cq_host->link_desc_len > 8)
+ *(link_temp + 8) = 0;
+
+ if (tag == DCMD_SLOT) {
+ *link_temp = VALID(0) | ACT(0) | END(1);
+ return;
+ }
+
+ *link_temp = VALID(1) | ACT(0x6) | END(0);
+
+ if (cq_host->dma64) {
+ __le64 *data_addr = (__le64 __force *)(link_temp + 4);
+ data_addr[0] = cpu_to_le64(trans_temp);
+ } else {
+ __le32 *data_addr = (__le32 __force *)(link_temp + 4);
+ data_addr[0] = cpu_to_le32(trans_temp);
+ }
+}
+
+static void cmdq_clear_set_irqs(struct cmdq_host *cq_host, u32 clear, u32 set)
+{
+ u32 ier;
+
+ ier = cmdq_readl(cq_host, CQISTE);
+ ier &= ~clear;
+ ier |= set;
+ cmdq_writel(cq_host, ier, CQISTE);
+ cmdq_writel(cq_host, ier, CQISGE);
+ /* ensure the writes are done */
+ mb();
+}
+
+
+#define DRV_NAME "cmdq-host"
+
+static void cmdq_dump_debug_ram(struct cmdq_host *cq_host)
+{
+ int i = 0;
+
+ pr_err("---- Debug RAM dump ----\n");
+ pr_err(DRV_NAME ": Debug RAM wrap-around: 0x%08x | Debug RAM overlap: 0x%08x\n",
+ cmdq_readl(cq_host, CQ_CMD_DBG_RAM_WA),
+ cmdq_readl(cq_host, CQ_CMD_DBG_RAM_OL));
+
+ while (i < 16) {
+ pr_err(DRV_NAME ": Debug RAM dump [%d]: 0x%08x\n", i,
+ cmdq_readl(cq_host, CQ_CMD_DBG_RAM + (0x4 * i)));
+ i++;
+ }
+ pr_err("-------------------------\n");
+}
+
+static void cmdq_dumpregs(struct cmdq_host *cq_host)
+{
+ struct mmc_host *mmc = cq_host->mmc;
+
+ pr_info(DRV_NAME ": ========== REGISTER DUMP (%s)==========\n",
+ mmc_hostname(mmc));
+
+ pr_info(DRV_NAME ": Caps: 0x%08x | Version: 0x%08x\n",
+ cmdq_readl(cq_host, CQCAP),
+ cmdq_readl(cq_host, CQVER));
+ pr_info(DRV_NAME ": Queing config: 0x%08x | Queue Ctrl: 0x%08x\n",
+ cmdq_readl(cq_host, CQCFG),
+ cmdq_readl(cq_host, CQCTL));
+ pr_info(DRV_NAME ": Int stat: 0x%08x | Int enab: 0x%08x\n",
+ cmdq_readl(cq_host, CQIS),
+ cmdq_readl(cq_host, CQISTE));
+ pr_info(DRV_NAME ": Int sig: 0x%08x | Int Coal: 0x%08x\n",
+ cmdq_readl(cq_host, CQISGE),
+ cmdq_readl(cq_host, CQIC));
+ pr_info(DRV_NAME ": TDL base: 0x%08x | TDL up32: 0x%08x\n",
+ cmdq_readl(cq_host, CQTDLBA),
+ cmdq_readl(cq_host, CQTDLBAU));
+ pr_info(DRV_NAME ": Doorbell: 0x%08x | Comp Notif: 0x%08x\n",
+ cmdq_readl(cq_host, CQTDBR),
+ cmdq_readl(cq_host, CQTCN));
+ pr_info(DRV_NAME ": Dev queue: 0x%08x | Dev Pend: 0x%08x\n",
+ cmdq_readl(cq_host, CQDQS),
+ cmdq_readl(cq_host, CQDPT));
+ pr_info(DRV_NAME ": Task clr: 0x%08x | Send stat 1: 0x%08x\n",
+ cmdq_readl(cq_host, CQTCLR),
+ cmdq_readl(cq_host, CQSSC1));
+ pr_info(DRV_NAME ": Send stat 2: 0x%08x | DCMD resp: 0x%08x\n",
+ cmdq_readl(cq_host, CQSSC2),
+ cmdq_readl(cq_host, CQCRDCT));
+ pr_info(DRV_NAME ": Resp err mask: 0x%08x | Task err: 0x%08x\n",
+ cmdq_readl(cq_host, CQRMEM),
+ cmdq_readl(cq_host, CQTERRI));
+ pr_info(DRV_NAME ": Resp idx 0x%08x | Resp arg: 0x%08x\n",
+ cmdq_readl(cq_host, CQCRI),
+ cmdq_readl(cq_host, CQCRA));
+ pr_info(DRV_NAME ": ===========================================\n");
+
+ cmdq_dump_debug_ram(cq_host);
+ if (cq_host->ops->dump_vendor_regs)
+ cq_host->ops->dump_vendor_regs(mmc);
+}
+
+/**
+ * The allocated descriptor table for task, link & transfer descritors
+ * looks like:
+ * |----------|
+ * |task desc | |->|----------|
+ * |----------| | |trans desc|
+ * |link desc-|->| |----------|
+ * |----------| .
+ * . .
+ * no. of slots max-segs
+ * . |----------|
+ * |----------|
+ * The idea here is to create the [task+trans] table and mark & point the
+ * link desc to the transfer desc table on a per slot basis.
+ */
+static int cmdq_host_alloc_tdl(struct cmdq_host *cq_host)
+{
+
+ size_t desc_size;
+ size_t data_size;
+ int i = 0;
+
+ /* task descriptor can be 64/128 bit irrespective of arch */
+ if (cq_host->caps & CMDQ_TASK_DESC_SZ_128) {
+ cmdq_writel(cq_host, cmdq_readl(cq_host, CQCFG) |
+ CQ_TASK_DESC_SZ, CQCFG);
+ cq_host->task_desc_len = 16;
+ } else {
+ cq_host->task_desc_len = 8;
+ }
+
+ /*
+ * 96 bits length of transfer desc instead of 128 bits which means
+ * ADMA would expect next valid descriptor at the 96th bit
+ * or 128th bit
+ */
+ if (cq_host->dma64) {
+ if (cq_host->quirks & CMDQ_QUIRK_SHORT_TXFR_DESC_SZ)
+ cq_host->trans_desc_len = 12;
+ else
+ cq_host->trans_desc_len = 16;
+ cq_host->link_desc_len = 16;
+ } else {
+ cq_host->trans_desc_len = 8;
+ cq_host->link_desc_len = 8;
+ }
+
+ /* total size of a slot: 1 task & 1 transfer (link) */
+ cq_host->slot_sz = cq_host->task_desc_len + cq_host->link_desc_len;
+
+ desc_size = cq_host->slot_sz * cq_host->num_slots;
+
+ data_size = cq_host->trans_desc_len * cq_host->mmc->max_segs *
+ (cq_host->num_slots - 1);
+
+ pr_info("%s: desc_size: %d data_sz: %d slot-sz: %d\n", __func__,
+ (int)desc_size, (int)data_size, cq_host->slot_sz);
+
+ /*
+ * allocate a dma-mapped chunk of memory for the descriptors
+ * allocate a dma-mapped chunk of memory for link descriptors
+ * setup each link-desc memory offset per slot-number to
+ * the descriptor table.
+ */
+ cq_host->desc_base = dmam_alloc_coherent(mmc_dev(cq_host->mmc),
+ desc_size,
+ &cq_host->desc_dma_base,
+ GFP_KERNEL);
+ cq_host->trans_desc_base = dmam_alloc_coherent(mmc_dev(cq_host->mmc),
+ data_size,
+ &cq_host->trans_desc_dma_base,
+ GFP_KERNEL);
+ if (!cq_host->desc_base || !cq_host->trans_desc_base)
+ return -ENOMEM;
+
+ pr_info("desc-base: 0x%p trans-base: 0x%p\n desc_dma 0x%llx trans_dma: 0x%llx\n",
+ cq_host->desc_base, cq_host->trans_desc_base,
+ (unsigned long long)cq_host->desc_dma_base,
+ (unsigned long long) cq_host->trans_desc_dma_base);
+
+ for (; i < (cq_host->num_slots); i++)
+ setup_trans_desc(cq_host, i);
+
+ return 0;
+}
+
+static int cmdq_enable(struct mmc_host *mmc)
+{
+ int err = 0;
+ u32 cqcfg;
+ bool dcmd_enable;
+ struct cmdq_host *cq_host = mmc_cmdq_private(mmc);
+
+ if (!cq_host || !mmc->card || !mmc_card_cmdq(mmc->card)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (cq_host->enabled)
+ goto out;
+
+ cqcfg = cmdq_readl(cq_host, CQCFG);
+ if (cqcfg & 0x1) {
+ pr_info("%s: %s: cq_host is already enabled\n",
+ mmc_hostname(mmc), __func__);
+ WARN_ON(1);
+ goto out;
+ }
+
+ if (cq_host->quirks & CMDQ_QUIRK_NO_DCMD)
+ dcmd_enable = false;
+ else
+ dcmd_enable = true;
+
+ cqcfg = ((cq_host->caps & CMDQ_TASK_DESC_SZ_128 ? CQ_TASK_DESC_SZ : 0) |
+ (dcmd_enable ? CQ_DCMD : 0));
+
+ cmdq_writel(cq_host, cqcfg, CQCFG);
+ /* enable CQ_HOST */
+ cmdq_writel(cq_host, cmdq_readl(cq_host, CQCFG) | CQ_ENABLE,
+ CQCFG);
+
+ if (!cq_host->desc_base ||
+ !cq_host->trans_desc_base) {
+ err = cmdq_host_alloc_tdl(cq_host);
+ if (err)
+ goto out;
+ cmdq_writel(cq_host, lower_32_bits(cq_host->desc_dma_base),
+ CQTDLBA);
+ cmdq_writel(cq_host, upper_32_bits(cq_host->desc_dma_base),
+ CQTDLBAU);
+ cmdq_dumpregs(cq_host);
+ }
+
+ /*
+ * disable all vendor interrupts
+ * enable CMDQ interrupts
+ * enable the vendor error interrupts
+ */
+ if (cq_host->ops->clear_set_irqs)
+ cq_host->ops->clear_set_irqs(mmc, true);
+
+ cmdq_clear_set_irqs(cq_host, 0x0, CQ_INT_ALL);
+
+ /* cq_host would use this rca to address the card */
+ cmdq_writel(cq_host, mmc->card->rca, CQSSC2);
+
+ /* send QSR at lesser intervals than the default */
+ cmdq_writel(cq_host, cmdq_readl(cq_host, CQSSC1) | SEND_QSR_INTERVAL,
+ CQSSC1);
+
+ /* ensure the writes are done before enabling CQE */
+ mb();
+
+ cq_host->enabled = true;
+
+ if (cq_host->ops->set_block_size)
+ cq_host->ops->set_block_size(cq_host->mmc);
+
+ if (cq_host->ops->set_data_timeout)
+ cq_host->ops->set_data_timeout(mmc, 0xf);
+
+ if (cq_host->ops->clear_set_dumpregs)
+ cq_host->ops->clear_set_dumpregs(mmc, 1);
+
+out:
+ return err;
+}
+
+static void cmdq_disable(struct mmc_host *mmc, bool soft)
+{
+ struct cmdq_host *cq_host = (struct cmdq_host *)mmc_cmdq_private(mmc);
+
+ if (soft) {
+ cmdq_writel(cq_host, cmdq_readl(
+ cq_host, CQCFG) & ~(CQ_ENABLE),
+ CQCFG);
+ }
+
+ cq_host->enabled = false;
+}
+
+static void cmdq_prep_task_desc(struct mmc_request *mrq,
+ u64 *data, bool intr, bool qbr)
+{
+ struct mmc_cmdq_req *cmdq_req = mrq->cmdq_req;
+ u32 req_flags = cmdq_req->cmdq_req_flags;
+
+ pr_debug("%s: %s: data-tag: 0x%08x - dir: %d - prio: %d - cnt: 0x%08x - addr: 0x%llx\n",
+ mmc_hostname(mrq->host), __func__,
+ !!(req_flags & DAT_TAG), !!(req_flags & DIR),
+ !!(req_flags & PRIO), cmdq_req->data.blocks,
+ (u64)mrq->cmdq_req->blk_addr);
+
+ *data = VALID(1) |
+ END(1) |
+ INT(intr) |
+ ACT(0x5) |
+ FORCED_PROG(!!(req_flags & FORCED_PRG)) |
+ CONTEXT(mrq->cmdq_req->ctx_id) |
+ DATA_TAG(!!(req_flags & DAT_TAG)) |
+ DATA_DIR(!!(req_flags & DIR)) |
+ PRIORITY(!!(req_flags & PRIO)) |
+ QBAR(qbr) |
+ REL_WRITE(!!(req_flags & REL_WR)) |
+ BLK_COUNT(mrq->cmdq_req->data.blocks) |
+ BLK_ADDR((u64)mrq->cmdq_req->blk_addr);
+}
+
+static int cmdq_dma_map(struct mmc_host *host, struct mmc_request *mrq)
+{
+ int sg_count;
+ struct mmc_data *data = mrq->data;
+
+ if (!data)
+ return -EINVAL;
+
+ sg_count = dma_map_sg(mmc_dev(host), data->sg,
+ data->sg_len,
+ (data->flags & MMC_DATA_WRITE) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (!sg_count) {
+ pr_err("%s: sg-len: %d\n", __func__, data->sg_len);
+ return -ENOMEM;
+ }
+
+ return sg_count;
+}
+
+static void cmdq_set_tran_desc(u8 *desc,
+ dma_addr_t addr, int len, bool end)
+{
+ __le64 *dataddr = (__le64 __force *)(desc + 4);
+ __le32 *attr = (__le32 __force *)desc;
+
+ *attr = (VALID(1) |
+ END(end ? 1 : 0) |
+ INT(0) |
+ ACT(0x4) |
+ DAT_LENGTH(len));
+
+ dataddr[0] = cpu_to_le64(addr);
+}
+
+static int cmdq_prep_tran_desc(struct mmc_request *mrq,
+ struct cmdq_host *cq_host, int tag)
+{
+ struct mmc_data *data = mrq->data;
+ int i, sg_count, len;
+ bool end = false;
+ dma_addr_t addr;
+ u8 *desc;
+ struct scatterlist *sg;
+
+ sg_count = cmdq_dma_map(mrq->host, mrq);
+ if (sg_count < 0) {
+ pr_err("%s: %s: unable to map sg lists, %d\n",
+ mmc_hostname(mrq->host), __func__, sg_count);
+ return sg_count;
+ }
+
+ desc = get_trans_desc(cq_host, tag);
+ memset(desc, 0, cq_host->trans_desc_len * cq_host->mmc->max_segs);
+
+ for_each_sg(data->sg, sg, sg_count, i) {
+ addr = sg_dma_address(sg);
+ len = sg_dma_len(sg);
+
+ if ((i+1) == sg_count)
+ end = true;
+ cmdq_set_tran_desc(desc, addr, len, end);
+ desc += cq_host->trans_desc_len;
+ }
+
+ pr_debug("%s: req: 0x%p tag: %d calc_trans_des: 0x%p sg-cnt: %d\n",
+ __func__, mrq->req, tag, desc, sg_count);
+
+ return 0;
+}
+
+static void cmdq_prep_dcmd_desc(struct mmc_host *mmc,
+ struct mmc_request *mrq)
+{
+ u64 *task_desc = NULL;
+ u64 data = 0;
+ u8 resp_type;
+ u8 *desc;
+ __le64 *dataddr;
+ struct cmdq_host *cq_host = mmc_cmdq_private(mmc);
+ u8 timing;
+
+ if (!(mrq->cmd->flags & MMC_RSP_PRESENT)) {
+ resp_type = 0x0;
+ timing = 0x1;
+ } else {
+ if (mrq->cmd->flags & MMC_RSP_R1B) {
+ resp_type = 0x3;
+ timing = 0x0;
+ } else {
+ resp_type = 0x2;
+ timing = 0x1;
+ }
+ }
+
+ task_desc = (__le64 __force *)get_desc(cq_host, cq_host->dcmd_slot);
+ memset(task_desc, 0, cq_host->task_desc_len);
+ data |= (VALID(1) |
+ END(1) |
+ INT(1) |
+ QBAR(1) |
+ ACT(0x5) |
+ CMD_INDEX(mrq->cmd->opcode) |
+ CMD_TIMING(timing) | RESP_TYPE(resp_type));
+ *task_desc |= data;
+ desc = (u8 *)task_desc;
+ pr_debug("cmdq: dcmd: cmd: %d timing: %d resp: %d\n",
+ mrq->cmd->opcode, timing, resp_type);
+ dataddr = (__le64 __force *)(desc + 4);
+ dataddr[0] = cpu_to_le64((u64)mrq->cmd->arg);
+
+}
+
+static int cmdq_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ int err;
+ u64 data = 0;
+ u64 *task_desc = NULL;
+ u32 tag = mrq->cmdq_req->tag;
+ struct cmdq_host *cq_host = (struct cmdq_host *)mmc_cmdq_private(mmc);
+
+ if (!cq_host->enabled) {
+ pr_err("%s: CMDQ host not enabled yet !!!\n",
+ mmc_hostname(mmc));
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (mrq->cmdq_req->cmdq_req_flags & DCMD) {
+ cmdq_prep_dcmd_desc(mmc, mrq);
+ cq_host->mrq_slot[DCMD_SLOT] = mrq;
+ cmdq_writel(cq_host, 1 << DCMD_SLOT, CQTDBR);
+ return 0;
+ }
+
+ task_desc = (__le64 __force *)get_desc(cq_host, tag);
+
+ cmdq_prep_task_desc(mrq, &data, 1,
+ (mrq->cmdq_req->cmdq_req_flags & QBR));
+ *task_desc = cpu_to_le64(data);
+
+ err = cmdq_prep_tran_desc(mrq, cq_host, tag);
+ if (err) {
+ pr_err("%s: %s: failed to setup tx desc: %d\n",
+ mmc_hostname(mmc), __func__, err);
+ return err;
+ }
+
+ BUG_ON(cmdq_readl(cq_host, CQTDBR) & (1 << tag));
+
+ cq_host->mrq_slot[tag] = mrq;
+ if (cq_host->ops->set_tranfer_params)
+ cq_host->ops->set_tranfer_params(mmc);
+
+ cmdq_writel(cq_host, 1 << tag, CQTDBR);
+
+out:
+ return err;
+}
+
+static void cmdq_finish_data(struct mmc_host *mmc, unsigned int tag)
+{
+ struct mmc_request *mrq;
+ struct cmdq_host *cq_host = (struct cmdq_host *)mmc_cmdq_private(mmc);
+
+ mrq = cq_host->mrq_slot[tag];
+ mrq->done(mrq);
+}
+
+irqreturn_t cmdq_irq(struct mmc_host *mmc, u32 intmask)
+{
+ u32 status;
+ unsigned long tag = 0, comp_status;
+ struct cmdq_host *cq_host = (struct cmdq_host *)mmc_cmdq_private(mmc);
+
+ status = cmdq_readl(cq_host, CQIS);
+ cmdq_writel(cq_host, status, CQIS);
+
+ if (status & CQIS_TCC) {
+ /* read QCTCN and complete the request */
+ comp_status = cmdq_readl(cq_host, CQTCN);
+ if (!comp_status)
+ goto out;
+
+ for_each_set_bit(tag, &comp_status, cq_host->num_slots) {
+ /* complete the corresponding mrq */
+ pr_debug("%s: completing tag -> %lu\n",
+ mmc_hostname(mmc), tag);
+ cmdq_finish_data(mmc, tag);
+ }
+ cmdq_writel(cq_host, comp_status, CQTCN);
+ }
+
+ if (status & CQIS_RED) {
+ /* task response has an error */
+ pr_err("%s: RED error %d !!!\n", mmc_hostname(mmc), status);
+ cmdq_dumpregs(cq_host);
+ }
+
+out:
+ return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(cmdq_irq);
+
+static void cmdq_post_req(struct mmc_host *host, struct mmc_request *mrq,
+ int err)
+{
+ struct mmc_data *data = mrq->data;
+
+ if (data) {
+ data->error = err;
+ dma_unmap_sg(mmc_dev(host), data->sg, data->sg_len,
+ (data->flags & MMC_DATA_READ) ?
+ DMA_FROM_DEVICE : DMA_TO_DEVICE);
+ if (err)
+ data->bytes_xfered = 0;
+ else
+ data->bytes_xfered = blk_rq_bytes(mrq->req);
+ }
+}
+
+static const struct mmc_cmdq_host_ops cmdq_host_ops = {
+ .enable = cmdq_enable,
+ .disable = cmdq_disable,
+ .request = cmdq_request,
+ .post_req = cmdq_post_req,
+};
+
+struct cmdq_host *cmdq_pltfm_init(struct platform_device *pdev)
+{
+ struct cmdq_host *cq_host;
+ struct resource *cmdq_memres = NULL;
+
+ /* check and setup CMDQ interface */
+ cmdq_memres = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "cmdq_mem");
+ if (!cmdq_memres) {
+ dev_dbg(&pdev->dev, "CMDQ not supported\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ cq_host = kzalloc(sizeof(*cq_host), GFP_KERNEL);
+ if (!cq_host) {
+ dev_err(&pdev->dev, "failed to allocate memory for CMDQ\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ cq_host->mmio = devm_ioremap(&pdev->dev,
+ cmdq_memres->start,
+ resource_size(cmdq_memres));
+ if (!cq_host->mmio) {
+ dev_err(&pdev->dev, "failed to remap cmdq regs\n");
+ kfree(cq_host);
+ return ERR_PTR(-EBUSY);
+ }
+ dev_dbg(&pdev->dev, "CMDQ ioremap: done\n");
+
+ return cq_host;
+}
+EXPORT_SYMBOL(cmdq_pltfm_init);
+
+int cmdq_init(struct cmdq_host *cq_host, struct mmc_host *mmc,
+ bool dma64)
+{
+ int err = 0;
+
+ cq_host->dma64 = dma64;
+ cq_host->mmc = mmc;
+ cq_host->mmc->cmdq_private = cq_host;
+
+ cq_host->num_slots = NUM_SLOTS;
+ cq_host->dcmd_slot = DCMD_SLOT;
+
+ mmc->cmdq_ops = &cmdq_host_ops;
+
+ cq_host->mrq_slot = kzalloc(sizeof(cq_host->mrq_slot) *
+ cq_host->num_slots, GFP_KERNEL);
+ if (!cq_host->mrq_slot)
+ return -ENOMEM;
+
+ init_completion(&cq_host->halt_comp);
+ return err;
+}
+EXPORT_SYMBOL(cmdq_init);
diff --git a/drivers/mmc/host/cmdq_hci.h b/drivers/mmc/host/cmdq_hci.h
new file mode 100644
index 0000000..e7f5a15
--- /dev/null
+++ b/drivers/mmc/host/cmdq_hci.h
@@ -0,0 +1,211 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef LINUX_MMC_CQ_HCI_H
+#define LINUX_MMC_CQ_HCI_H
+#include <linux/mmc/core.h>
+
+/* registers */
+/* version */
+#define CQVER 0x00
+/* capabilities */
+#define CQCAP 0x04
+/* configuration */
+#define CQCFG 0x08
+#define CQ_DCMD 0x00001000
+#define CQ_TASK_DESC_SZ 0x00000100
+#define CQ_ENABLE 0x00000001
+
+/* control */
+#define CQCTL 0x0C
+#define CLEAR_ALL_TASKS 0x00000100
+#define HALT 0x00000001
+
+/* interrupt status */
+#define CQIS 0x10
+#define CQIS_HAC (1 << 0)
+#define CQIS_TCC (1 << 1)
+#define CQIS_RED (1 << 2)
+#define CQIS_TCL (1 << 3)
+
+/* interrupt status enable */
+#define CQISTE 0x14
+
+/* interrupt signal enable */
+#define CQISGE 0x18
+
+/* interrupt coalescing */
+#define CQIC 0x1C
+#define CQIC_ENABLE (1 << 31)
+#define CQIC_RESET (1 << 16)
+#define CQIC_ICCTHWEN (1 << 15)
+#define CQIC_ICCTH(x) ((x & 0x1F) << 8)
+#define CQIC_ICTOVALWEN (1 << 7)
+#define CQIC_ICTOVAL(x) (x & 0x7F)
+
+/* task list base address */
+#define CQTDLBA 0x20
+
+/* task list base address upper */
+#define CQTDLBAU 0x24
+
+/* door-bell */
+#define CQTDBR 0x28
+
+/* task completion notification */
+#define CQTCN 0x2C
+
+/* device queue status */
+#define CQDQS 0x30
+
+/* device pending tasks */
+#define CQDPT 0x34
+
+/* task clear */
+#define CQTCLR 0x38
+
+/* send status config 1 */
+#define CQSSC1 0x40
+/*
+ * Value n means CQE would send CMD13 during the transfer of data block
+ * BLOCK_CNT-n
+ */
+#define SEND_QSR_INTERVAL 0x70000
+
+/* send status config 2 */
+#define CQSSC2 0x44
+
+/* response for dcmd */
+#define CQCRDCT 0x48
+
+/* response mode error mask */
+#define CQRMEM 0x50
+
+/* task error info */
+#define CQTERRI 0x54
+
+/* command response index */
+#define CQCRI 0x58
+
+/* command response argument */
+#define CQCRA 0x5C
+
+#define CQ_INT_ALL 0xF
+#define CQIC_DEFAULT_ICCTH 31
+#define CQIC_DEFAULT_ICTOVAL 1
+
+#define CQ_CMD_DBG_RAM 0x158
+#define CQ_CMD_DBG_RAM_WA 0x198
+#define CQ_CMD_DBG_RAM_OL 0x19C
+
+/* attribute fields */
+#define VALID(x) ((x & 1) << 0)
+#define END(x) ((x & 1) << 1)
+#define INT(x) ((x & 1) << 2)
+#define ACT(x) ((x & 0x7) << 3)
+
+/* data command task descriptor fields */
+#define FORCED_PROG(x) ((x & 1) << 6)
+#define CONTEXT(x) ((x & 0xF) << 7)
+#define DATA_TAG(x) ((x & 1) << 11)
+#define DATA_DIR(x) ((x & 1) << 12)
+#define PRIORITY(x) ((x & 1) << 13)
+#define QBAR(x) ((x & 1) << 14)
+#define REL_WRITE(x) ((x & 1) << 15)
+#define BLK_COUNT(x) ((x & 0xFFFF) << 16)
+#define BLK_ADDR(x) ((x & 0xFFFFFFFF) << 32)
+
+/* direct command task descriptor fields */
+#define CMD_INDEX(x) ((x & 0x3F) << 16)
+#define CMD_TIMING(x) ((x & 1) << 22)
+#define RESP_TYPE(x) ((x & 0x3) << 23)
+
+/* transfer descriptor fields */
+#define DAT_LENGTH(x) ((x & 0xFFFF) << 16)
+#define DAT_ADDR_LO(x) ((x & 0xFFFFFFFF) << 32)
+#define DAT_ADDR_HI(x) ((x & 0xFFFFFFFF) << 0)
+
+struct cmdq_host {
+ const struct cmdq_host_ops *ops;
+ void __iomem *mmio;
+ struct mmc_host *mmc;
+
+ /* 64 bit DMA */
+ bool dma64;
+ int num_slots;
+
+ u32 dcmd_slot;
+ u32 caps;
+#define CMDQ_TASK_DESC_SZ_128 0x1
+
+ u32 quirks;
+#define CMDQ_QUIRK_SHORT_TXFR_DESC_SZ 0x1
+#define CMDQ_QUIRK_NO_DCMD 0x2
+
+ bool enabled;
+ bool halted;
+ bool init_done;
+
+ u8 *desc_base;
+
+ /* total descriptor size */
+ u8 slot_sz;
+
+ /* 64/128 bit depends on CQCFG */
+ u8 task_desc_len;
+
+ /* 64 bit on 32-bit arch, 128 bit on 64-bit */
+ u8 link_desc_len;
+
+ u8 *trans_desc_base;
+ /* same length as transfer descriptor */
+ u8 trans_desc_len;
+
+ dma_addr_t desc_dma_base;
+ dma_addr_t trans_desc_dma_base;
+
+ struct completion halt_comp;
+ struct mmc_request **mrq_slot;
+ void *private;
+};
+
+struct cmdq_host_ops {
+ void (*set_tranfer_params)(struct mmc_host *mmc);
+ void (*set_data_timeout)(struct mmc_host *mmc, u32 val);
+ void (*clear_set_irqs)(struct mmc_host *mmc, bool clear);
+ void (*set_block_size)(struct mmc_host *mmc);
+ void (*dump_vendor_regs)(struct mmc_host *mmc);
+ void (*write_l)(struct cmdq_host *host, u32 val, int reg);
+ u32 (*read_l)(struct cmdq_host *host, int reg);
+ void (*clear_set_dumpregs)(struct mmc_host *mmc, bool set);
+};
+
+static inline void cmdq_writel(struct cmdq_host *host, u32 val, int reg)
+{
+ if (unlikely(host->ops->write_l))
+ host->ops->write_l(host, val, reg);
+ else
+ writel_relaxed(val, host->mmio + reg);
+}
+
+static inline u32 cmdq_readl(struct cmdq_host *host, int reg)
+{
+ if (unlikely(host->ops->read_l))
+ return host->ops->read_l(host, reg);
+ else
+ return readl_relaxed(host->mmio + reg);
+}
+
+extern irqreturn_t cmdq_irq(struct mmc_host *mmc, u32 intmask);
+extern int cmdq_init(struct cmdq_host *cq_host, struct mmc_host *mmc,
+ bool dma64);
+extern struct cmdq_host *cmdq_pltfm_init(struct platform_device *pdev);
+#endif
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index dfe094a..135a83e 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -420,6 +420,13 @@ struct mmc_host {
u32 dsr; /* optional driver stage (DSR) value */

struct mmc_cmdq_context_info cmdq_ctx;
+ /*
+ * several cmdq supporting host controllers are extensions
+ * of legacy controllers. This variable can be used to store
+ * a reference to the cmdq extension of the existing host
+ * controller.
+ */
+ void *cmdq_private;
unsigned long private[0] ____cacheline_aligned;
};

@@ -434,6 +441,11 @@ static inline void *mmc_priv(struct mmc_host *host)
return (void *)host->private;
}

+static inline void *mmc_cmdq_private(struct mmc_host *host)
+{
+ return host->cmdq_private;
+}
+
#define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)

#define mmc_dev(x) ((x)->parent)