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-rw-r--r--drivers/bus/mhi/host/init.c1464
1 files changed, 1464 insertions, 0 deletions
diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
new file mode 100644
index 0000000000..f78aefd2d7
--- /dev/null
+++ b/drivers/bus/mhi/host/init.c
@@ -0,0 +1,1464 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
+ *
+ */
+
+#include <linux/bitfield.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/dma-direction.h>
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/mhi.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include "internal.h"
+
+static DEFINE_IDA(mhi_controller_ida);
+
+const char * const mhi_ee_str[MHI_EE_MAX] = {
+ [MHI_EE_PBL] = "PRIMARY BOOTLOADER",
+ [MHI_EE_SBL] = "SECONDARY BOOTLOADER",
+ [MHI_EE_AMSS] = "MISSION MODE",
+ [MHI_EE_RDDM] = "RAMDUMP DOWNLOAD MODE",
+ [MHI_EE_WFW] = "WLAN FIRMWARE",
+ [MHI_EE_PTHRU] = "PASS THROUGH",
+ [MHI_EE_EDL] = "EMERGENCY DOWNLOAD",
+ [MHI_EE_FP] = "FLASH PROGRAMMER",
+ [MHI_EE_DISABLE_TRANSITION] = "DISABLE",
+ [MHI_EE_NOT_SUPPORTED] = "NOT SUPPORTED",
+};
+
+const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX] = {
+ [DEV_ST_TRANSITION_PBL] = "PBL",
+ [DEV_ST_TRANSITION_READY] = "READY",
+ [DEV_ST_TRANSITION_SBL] = "SBL",
+ [DEV_ST_TRANSITION_MISSION_MODE] = "MISSION MODE",
+ [DEV_ST_TRANSITION_FP] = "FLASH PROGRAMMER",
+ [DEV_ST_TRANSITION_SYS_ERR] = "SYS ERROR",
+ [DEV_ST_TRANSITION_DISABLE] = "DISABLE",
+};
+
+const char * const mhi_ch_state_type_str[MHI_CH_STATE_TYPE_MAX] = {
+ [MHI_CH_STATE_TYPE_RESET] = "RESET",
+ [MHI_CH_STATE_TYPE_STOP] = "STOP",
+ [MHI_CH_STATE_TYPE_START] = "START",
+};
+
+static const char * const mhi_pm_state_str[] = {
+ [MHI_PM_STATE_DISABLE] = "DISABLE",
+ [MHI_PM_STATE_POR] = "POWER ON RESET",
+ [MHI_PM_STATE_M0] = "M0",
+ [MHI_PM_STATE_M2] = "M2",
+ [MHI_PM_STATE_M3_ENTER] = "M?->M3",
+ [MHI_PM_STATE_M3] = "M3",
+ [MHI_PM_STATE_M3_EXIT] = "M3->M0",
+ [MHI_PM_STATE_FW_DL_ERR] = "Firmware Download Error",
+ [MHI_PM_STATE_SYS_ERR_DETECT] = "SYS ERROR Detect",
+ [MHI_PM_STATE_SYS_ERR_PROCESS] = "SYS ERROR Process",
+ [MHI_PM_STATE_SHUTDOWN_PROCESS] = "SHUTDOWN Process",
+ [MHI_PM_STATE_LD_ERR_FATAL_DETECT] = "Linkdown or Error Fatal Detect",
+};
+
+const char *to_mhi_pm_state_str(u32 state)
+{
+ int index;
+
+ if (state)
+ index = __fls(state);
+
+ if (!state || index >= ARRAY_SIZE(mhi_pm_state_str))
+ return "Invalid State";
+
+ return mhi_pm_state_str[index];
+}
+
+static ssize_t serial_number_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct mhi_device *mhi_dev = to_mhi_device(dev);
+ struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
+
+ return sysfs_emit(buf, "Serial Number: %u\n",
+ mhi_cntrl->serial_number);
+}
+static DEVICE_ATTR_RO(serial_number);
+
+static ssize_t oem_pk_hash_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct mhi_device *mhi_dev = to_mhi_device(dev);
+ struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
+ int i, cnt = 0;
+
+ for (i = 0; i < ARRAY_SIZE(mhi_cntrl->oem_pk_hash); i++)
+ cnt += sysfs_emit_at(buf, cnt, "OEMPKHASH[%d]: 0x%x\n",
+ i, mhi_cntrl->oem_pk_hash[i]);
+
+ return cnt;
+}
+static DEVICE_ATTR_RO(oem_pk_hash);
+
+static ssize_t soc_reset_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct mhi_device *mhi_dev = to_mhi_device(dev);
+ struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
+
+ mhi_soc_reset(mhi_cntrl);
+ return count;
+}
+static DEVICE_ATTR_WO(soc_reset);
+
+static struct attribute *mhi_dev_attrs[] = {
+ &dev_attr_serial_number.attr,
+ &dev_attr_oem_pk_hash.attr,
+ &dev_attr_soc_reset.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(mhi_dev);
+
+/* MHI protocol requires the transfer ring to be aligned with ring length */
+static int mhi_alloc_aligned_ring(struct mhi_controller *mhi_cntrl,
+ struct mhi_ring *ring,
+ u64 len)
+{
+ ring->alloc_size = len + (len - 1);
+ ring->pre_aligned = dma_alloc_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
+ &ring->dma_handle, GFP_KERNEL);
+ if (!ring->pre_aligned)
+ return -ENOMEM;
+
+ ring->iommu_base = (ring->dma_handle + (len - 1)) & ~(len - 1);
+ ring->base = ring->pre_aligned + (ring->iommu_base - ring->dma_handle);
+
+ return 0;
+}
+
+void mhi_deinit_free_irq(struct mhi_controller *mhi_cntrl)
+{
+ int i;
+ struct mhi_event *mhi_event = mhi_cntrl->mhi_event;
+
+ for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) {
+ if (mhi_event->offload_ev)
+ continue;
+
+ free_irq(mhi_cntrl->irq[mhi_event->irq], mhi_event);
+ }
+
+ free_irq(mhi_cntrl->irq[0], mhi_cntrl);
+}
+
+int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl)
+{
+ struct mhi_event *mhi_event = mhi_cntrl->mhi_event;
+ struct device *dev = &mhi_cntrl->mhi_dev->dev;
+ unsigned long irq_flags = IRQF_SHARED | IRQF_NO_SUSPEND;
+ int i, ret;
+
+ /* if controller driver has set irq_flags, use it */
+ if (mhi_cntrl->irq_flags)
+ irq_flags = mhi_cntrl->irq_flags;
+
+ /* Setup BHI_INTVEC IRQ */
+ ret = request_threaded_irq(mhi_cntrl->irq[0], mhi_intvec_handler,
+ mhi_intvec_threaded_handler,
+ irq_flags,
+ "bhi", mhi_cntrl);
+ if (ret)
+ return ret;
+ /*
+ * IRQs should be enabled during mhi_async_power_up(), so disable them explicitly here.
+ * Due to the use of IRQF_SHARED flag as default while requesting IRQs, we assume that
+ * IRQ_NOAUTOEN is not applicable.
+ */
+ disable_irq(mhi_cntrl->irq[0]);
+
+ for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) {
+ if (mhi_event->offload_ev)
+ continue;
+
+ if (mhi_event->irq >= mhi_cntrl->nr_irqs) {
+ dev_err(dev, "irq %d not available for event ring\n",
+ mhi_event->irq);
+ ret = -EINVAL;
+ goto error_request;
+ }
+
+ ret = request_irq(mhi_cntrl->irq[mhi_event->irq],
+ mhi_irq_handler,
+ irq_flags,
+ "mhi", mhi_event);
+ if (ret) {
+ dev_err(dev, "Error requesting irq:%d for ev:%d\n",
+ mhi_cntrl->irq[mhi_event->irq], i);
+ goto error_request;
+ }
+
+ disable_irq(mhi_cntrl->irq[mhi_event->irq]);
+ }
+
+ return 0;
+
+error_request:
+ for (--i, --mhi_event; i >= 0; i--, mhi_event--) {
+ if (mhi_event->offload_ev)
+ continue;
+
+ free_irq(mhi_cntrl->irq[mhi_event->irq], mhi_event);
+ }
+ free_irq(mhi_cntrl->irq[0], mhi_cntrl);
+
+ return ret;
+}
+
+void mhi_deinit_dev_ctxt(struct mhi_controller *mhi_cntrl)
+{
+ int i;
+ struct mhi_ctxt *mhi_ctxt = mhi_cntrl->mhi_ctxt;
+ struct mhi_cmd *mhi_cmd;
+ struct mhi_event *mhi_event;
+ struct mhi_ring *ring;
+
+ mhi_cmd = mhi_cntrl->mhi_cmd;
+ for (i = 0; i < NR_OF_CMD_RINGS; i++, mhi_cmd++) {
+ ring = &mhi_cmd->ring;
+ dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
+ ring->pre_aligned, ring->dma_handle);
+ ring->base = NULL;
+ ring->iommu_base = 0;
+ }
+
+ dma_free_coherent(mhi_cntrl->cntrl_dev,
+ sizeof(*mhi_ctxt->cmd_ctxt) * NR_OF_CMD_RINGS,
+ mhi_ctxt->cmd_ctxt, mhi_ctxt->cmd_ctxt_addr);
+
+ mhi_event = mhi_cntrl->mhi_event;
+ for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) {
+ if (mhi_event->offload_ev)
+ continue;
+
+ ring = &mhi_event->ring;
+ dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
+ ring->pre_aligned, ring->dma_handle);
+ ring->base = NULL;
+ ring->iommu_base = 0;
+ }
+
+ dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->er_ctxt) *
+ mhi_cntrl->total_ev_rings, mhi_ctxt->er_ctxt,
+ mhi_ctxt->er_ctxt_addr);
+
+ dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->chan_ctxt) *
+ mhi_cntrl->max_chan, mhi_ctxt->chan_ctxt,
+ mhi_ctxt->chan_ctxt_addr);
+
+ kfree(mhi_ctxt);
+ mhi_cntrl->mhi_ctxt = NULL;
+}
+
+int mhi_init_dev_ctxt(struct mhi_controller *mhi_cntrl)
+{
+ struct mhi_ctxt *mhi_ctxt;
+ struct mhi_chan_ctxt *chan_ctxt;
+ struct mhi_event_ctxt *er_ctxt;
+ struct mhi_cmd_ctxt *cmd_ctxt;
+ struct mhi_chan *mhi_chan;
+ struct mhi_event *mhi_event;
+ struct mhi_cmd *mhi_cmd;
+ u32 tmp;
+ int ret = -ENOMEM, i;
+
+ atomic_set(&mhi_cntrl->dev_wake, 0);
+ atomic_set(&mhi_cntrl->pending_pkts, 0);
+
+ mhi_ctxt = kzalloc(sizeof(*mhi_ctxt), GFP_KERNEL);
+ if (!mhi_ctxt)
+ return -ENOMEM;
+
+ /* Setup channel ctxt */
+ mhi_ctxt->chan_ctxt = dma_alloc_coherent(mhi_cntrl->cntrl_dev,
+ sizeof(*mhi_ctxt->chan_ctxt) *
+ mhi_cntrl->max_chan,
+ &mhi_ctxt->chan_ctxt_addr,
+ GFP_KERNEL);
+ if (!mhi_ctxt->chan_ctxt)
+ goto error_alloc_chan_ctxt;
+
+ mhi_chan = mhi_cntrl->mhi_chan;
+ chan_ctxt = mhi_ctxt->chan_ctxt;
+ for (i = 0; i < mhi_cntrl->max_chan; i++, chan_ctxt++, mhi_chan++) {
+ /* Skip if it is an offload channel */
+ if (mhi_chan->offload_ch)
+ continue;
+
+ tmp = le32_to_cpu(chan_ctxt->chcfg);
+ tmp &= ~CHAN_CTX_CHSTATE_MASK;
+ tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_DISABLED);
+ tmp &= ~CHAN_CTX_BRSTMODE_MASK;
+ tmp |= FIELD_PREP(CHAN_CTX_BRSTMODE_MASK, mhi_chan->db_cfg.brstmode);
+ tmp &= ~CHAN_CTX_POLLCFG_MASK;
+ tmp |= FIELD_PREP(CHAN_CTX_POLLCFG_MASK, mhi_chan->db_cfg.pollcfg);
+ chan_ctxt->chcfg = cpu_to_le32(tmp);
+
+ chan_ctxt->chtype = cpu_to_le32(mhi_chan->type);
+ chan_ctxt->erindex = cpu_to_le32(mhi_chan->er_index);
+
+ mhi_chan->ch_state = MHI_CH_STATE_DISABLED;
+ mhi_chan->tre_ring.db_addr = (void __iomem *)&chan_ctxt->wp;
+ }
+
+ /* Setup event context */
+ mhi_ctxt->er_ctxt = dma_alloc_coherent(mhi_cntrl->cntrl_dev,
+ sizeof(*mhi_ctxt->er_ctxt) *
+ mhi_cntrl->total_ev_rings,
+ &mhi_ctxt->er_ctxt_addr,
+ GFP_KERNEL);
+ if (!mhi_ctxt->er_ctxt)
+ goto error_alloc_er_ctxt;
+
+ er_ctxt = mhi_ctxt->er_ctxt;
+ mhi_event = mhi_cntrl->mhi_event;
+ for (i = 0; i < mhi_cntrl->total_ev_rings; i++, er_ctxt++,
+ mhi_event++) {
+ struct mhi_ring *ring = &mhi_event->ring;
+
+ /* Skip if it is an offload event */
+ if (mhi_event->offload_ev)
+ continue;
+
+ tmp = le32_to_cpu(er_ctxt->intmod);
+ tmp &= ~EV_CTX_INTMODC_MASK;
+ tmp &= ~EV_CTX_INTMODT_MASK;
+ tmp |= FIELD_PREP(EV_CTX_INTMODT_MASK, mhi_event->intmod);
+ er_ctxt->intmod = cpu_to_le32(tmp);
+
+ er_ctxt->ertype = cpu_to_le32(MHI_ER_TYPE_VALID);
+ er_ctxt->msivec = cpu_to_le32(mhi_event->irq);
+ mhi_event->db_cfg.db_mode = true;
+
+ ring->el_size = sizeof(struct mhi_ring_element);
+ ring->len = ring->el_size * ring->elements;
+ ret = mhi_alloc_aligned_ring(mhi_cntrl, ring, ring->len);
+ if (ret)
+ goto error_alloc_er;
+
+ /*
+ * If the read pointer equals to the write pointer, then the
+ * ring is empty
+ */
+ ring->rp = ring->wp = ring->base;
+ er_ctxt->rbase = cpu_to_le64(ring->iommu_base);
+ er_ctxt->rp = er_ctxt->wp = er_ctxt->rbase;
+ er_ctxt->rlen = cpu_to_le64(ring->len);
+ ring->ctxt_wp = &er_ctxt->wp;
+ }
+
+ /* Setup cmd context */
+ ret = -ENOMEM;
+ mhi_ctxt->cmd_ctxt = dma_alloc_coherent(mhi_cntrl->cntrl_dev,
+ sizeof(*mhi_ctxt->cmd_ctxt) *
+ NR_OF_CMD_RINGS,
+ &mhi_ctxt->cmd_ctxt_addr,
+ GFP_KERNEL);
+ if (!mhi_ctxt->cmd_ctxt)
+ goto error_alloc_er;
+
+ mhi_cmd = mhi_cntrl->mhi_cmd;
+ cmd_ctxt = mhi_ctxt->cmd_ctxt;
+ for (i = 0; i < NR_OF_CMD_RINGS; i++, mhi_cmd++, cmd_ctxt++) {
+ struct mhi_ring *ring = &mhi_cmd->ring;
+
+ ring->el_size = sizeof(struct mhi_ring_element);
+ ring->elements = CMD_EL_PER_RING;
+ ring->len = ring->el_size * ring->elements;
+ ret = mhi_alloc_aligned_ring(mhi_cntrl, ring, ring->len);
+ if (ret)
+ goto error_alloc_cmd;
+
+ ring->rp = ring->wp = ring->base;
+ cmd_ctxt->rbase = cpu_to_le64(ring->iommu_base);
+ cmd_ctxt->rp = cmd_ctxt->wp = cmd_ctxt->rbase;
+ cmd_ctxt->rlen = cpu_to_le64(ring->len);
+ ring->ctxt_wp = &cmd_ctxt->wp;
+ }
+
+ mhi_cntrl->mhi_ctxt = mhi_ctxt;
+
+ return 0;
+
+error_alloc_cmd:
+ for (--i, --mhi_cmd; i >= 0; i--, mhi_cmd--) {
+ struct mhi_ring *ring = &mhi_cmd->ring;
+
+ dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
+ ring->pre_aligned, ring->dma_handle);
+ }
+ dma_free_coherent(mhi_cntrl->cntrl_dev,
+ sizeof(*mhi_ctxt->cmd_ctxt) * NR_OF_CMD_RINGS,
+ mhi_ctxt->cmd_ctxt, mhi_ctxt->cmd_ctxt_addr);
+ i = mhi_cntrl->total_ev_rings;
+ mhi_event = mhi_cntrl->mhi_event + i;
+
+error_alloc_er:
+ for (--i, --mhi_event; i >= 0; i--, mhi_event--) {
+ struct mhi_ring *ring = &mhi_event->ring;
+
+ if (mhi_event->offload_ev)
+ continue;
+
+ dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
+ ring->pre_aligned, ring->dma_handle);
+ }
+ dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->er_ctxt) *
+ mhi_cntrl->total_ev_rings, mhi_ctxt->er_ctxt,
+ mhi_ctxt->er_ctxt_addr);
+
+error_alloc_er_ctxt:
+ dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->chan_ctxt) *
+ mhi_cntrl->max_chan, mhi_ctxt->chan_ctxt,
+ mhi_ctxt->chan_ctxt_addr);
+
+error_alloc_chan_ctxt:
+ kfree(mhi_ctxt);
+
+ return ret;
+}
+
+int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
+{
+ u32 val;
+ int i, ret;
+ struct mhi_chan *mhi_chan;
+ struct mhi_event *mhi_event;
+ void __iomem *base = mhi_cntrl->regs;
+ struct device *dev = &mhi_cntrl->mhi_dev->dev;
+ struct {
+ u32 offset;
+ u32 val;
+ } reg_info[] = {
+ {
+ CCABAP_HIGHER,
+ upper_32_bits(mhi_cntrl->mhi_ctxt->chan_ctxt_addr),
+ },
+ {
+ CCABAP_LOWER,
+ lower_32_bits(mhi_cntrl->mhi_ctxt->chan_ctxt_addr),
+ },
+ {
+ ECABAP_HIGHER,
+ upper_32_bits(mhi_cntrl->mhi_ctxt->er_ctxt_addr),
+ },
+ {
+ ECABAP_LOWER,
+ lower_32_bits(mhi_cntrl->mhi_ctxt->er_ctxt_addr),
+ },
+ {
+ CRCBAP_HIGHER,
+ upper_32_bits(mhi_cntrl->mhi_ctxt->cmd_ctxt_addr),
+ },
+ {
+ CRCBAP_LOWER,
+ lower_32_bits(mhi_cntrl->mhi_ctxt->cmd_ctxt_addr),
+ },
+ {
+ MHICTRLBASE_HIGHER,
+ upper_32_bits(mhi_cntrl->iova_start),
+ },
+ {
+ MHICTRLBASE_LOWER,
+ lower_32_bits(mhi_cntrl->iova_start),
+ },
+ {
+ MHIDATABASE_HIGHER,
+ upper_32_bits(mhi_cntrl->iova_start),
+ },
+ {
+ MHIDATABASE_LOWER,
+ lower_32_bits(mhi_cntrl->iova_start),
+ },
+ {
+ MHICTRLLIMIT_HIGHER,
+ upper_32_bits(mhi_cntrl->iova_stop),
+ },
+ {
+ MHICTRLLIMIT_LOWER,
+ lower_32_bits(mhi_cntrl->iova_stop),
+ },
+ {
+ MHIDATALIMIT_HIGHER,
+ upper_32_bits(mhi_cntrl->iova_stop),
+ },
+ {
+ MHIDATALIMIT_LOWER,
+ lower_32_bits(mhi_cntrl->iova_stop),
+ },
+ {0, 0}
+ };
+
+ dev_dbg(dev, "Initializing MHI registers\n");
+
+ /* Read channel db offset */
+ ret = mhi_read_reg(mhi_cntrl, base, CHDBOFF, &val);
+ if (ret) {
+ dev_err(dev, "Unable to read CHDBOFF register\n");
+ return -EIO;
+ }
+
+ if (val >= mhi_cntrl->reg_len - (8 * MHI_DEV_WAKE_DB)) {
+ dev_err(dev, "CHDB offset: 0x%x is out of range: 0x%zx\n",
+ val, mhi_cntrl->reg_len - (8 * MHI_DEV_WAKE_DB));
+ return -ERANGE;
+ }
+
+ /* Setup wake db */
+ mhi_cntrl->wake_db = base + val + (8 * MHI_DEV_WAKE_DB);
+ mhi_cntrl->wake_set = false;
+
+ /* Setup channel db address for each channel in tre_ring */
+ mhi_chan = mhi_cntrl->mhi_chan;
+ for (i = 0; i < mhi_cntrl->max_chan; i++, val += 8, mhi_chan++)
+ mhi_chan->tre_ring.db_addr = base + val;
+
+ /* Read event ring db offset */
+ ret = mhi_read_reg(mhi_cntrl, base, ERDBOFF, &val);
+ if (ret) {
+ dev_err(dev, "Unable to read ERDBOFF register\n");
+ return -EIO;
+ }
+
+ if (val >= mhi_cntrl->reg_len - (8 * mhi_cntrl->total_ev_rings)) {
+ dev_err(dev, "ERDB offset: 0x%x is out of range: 0x%zx\n",
+ val, mhi_cntrl->reg_len - (8 * mhi_cntrl->total_ev_rings));
+ return -ERANGE;
+ }
+
+ /* Setup event db address for each ev_ring */
+ mhi_event = mhi_cntrl->mhi_event;
+ for (i = 0; i < mhi_cntrl->total_ev_rings; i++, val += 8, mhi_event++) {
+ if (mhi_event->offload_ev)
+ continue;
+
+ mhi_event->ring.db_addr = base + val;
+ }
+
+ /* Setup DB register for primary CMD rings */
+ mhi_cntrl->mhi_cmd[PRIMARY_CMD_RING].ring.db_addr = base + CRDB_LOWER;
+
+ /* Write to MMIO registers */
+ for (i = 0; reg_info[i].offset; i++)
+ mhi_write_reg(mhi_cntrl, base, reg_info[i].offset,
+ reg_info[i].val);
+
+ ret = mhi_write_reg_field(mhi_cntrl, base, MHICFG, MHICFG_NER_MASK,
+ mhi_cntrl->total_ev_rings);
+ if (ret) {
+ dev_err(dev, "Unable to write MHICFG register\n");
+ return ret;
+ }
+
+ ret = mhi_write_reg_field(mhi_cntrl, base, MHICFG, MHICFG_NHWER_MASK,
+ mhi_cntrl->hw_ev_rings);
+ if (ret) {
+ dev_err(dev, "Unable to write MHICFG register\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
+ struct mhi_chan *mhi_chan)
+{
+ struct mhi_ring *buf_ring;
+ struct mhi_ring *tre_ring;
+ struct mhi_chan_ctxt *chan_ctxt;
+ u32 tmp;
+
+ buf_ring = &mhi_chan->buf_ring;
+ tre_ring = &mhi_chan->tre_ring;
+ chan_ctxt = &mhi_cntrl->mhi_ctxt->chan_ctxt[mhi_chan->chan];
+
+ if (!chan_ctxt->rbase) /* Already uninitialized */
+ return;
+
+ dma_free_coherent(mhi_cntrl->cntrl_dev, tre_ring->alloc_size,
+ tre_ring->pre_aligned, tre_ring->dma_handle);
+ vfree(buf_ring->base);
+
+ buf_ring->base = tre_ring->base = NULL;
+ tre_ring->ctxt_wp = NULL;
+ chan_ctxt->rbase = 0;
+ chan_ctxt->rlen = 0;
+ chan_ctxt->rp = 0;
+ chan_ctxt->wp = 0;
+
+ tmp = le32_to_cpu(chan_ctxt->chcfg);
+ tmp &= ~CHAN_CTX_CHSTATE_MASK;
+ tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_DISABLED);
+ chan_ctxt->chcfg = cpu_to_le32(tmp);
+
+ /* Update to all cores */
+ smp_wmb();
+}
+
+int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,
+ struct mhi_chan *mhi_chan)
+{
+ struct mhi_ring *buf_ring;
+ struct mhi_ring *tre_ring;
+ struct mhi_chan_ctxt *chan_ctxt;
+ u32 tmp;
+ int ret;
+
+ buf_ring = &mhi_chan->buf_ring;
+ tre_ring = &mhi_chan->tre_ring;
+ tre_ring->el_size = sizeof(struct mhi_ring_element);
+ tre_ring->len = tre_ring->el_size * tre_ring->elements;
+ chan_ctxt = &mhi_cntrl->mhi_ctxt->chan_ctxt[mhi_chan->chan];
+ ret = mhi_alloc_aligned_ring(mhi_cntrl, tre_ring, tre_ring->len);
+ if (ret)
+ return -ENOMEM;
+
+ buf_ring->el_size = sizeof(struct mhi_buf_info);
+ buf_ring->len = buf_ring->el_size * buf_ring->elements;
+ buf_ring->base = vzalloc(buf_ring->len);
+
+ if (!buf_ring->base) {
+ dma_free_coherent(mhi_cntrl->cntrl_dev, tre_ring->alloc_size,
+ tre_ring->pre_aligned, tre_ring->dma_handle);
+ return -ENOMEM;
+ }
+
+ tmp = le32_to_cpu(chan_ctxt->chcfg);
+ tmp &= ~CHAN_CTX_CHSTATE_MASK;
+ tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_ENABLED);
+ chan_ctxt->chcfg = cpu_to_le32(tmp);
+
+ chan_ctxt->rbase = cpu_to_le64(tre_ring->iommu_base);
+ chan_ctxt->rp = chan_ctxt->wp = chan_ctxt->rbase;
+ chan_ctxt->rlen = cpu_to_le64(tre_ring->len);
+ tre_ring->ctxt_wp = &chan_ctxt->wp;
+
+ tre_ring->rp = tre_ring->wp = tre_ring->base;
+ buf_ring->rp = buf_ring->wp = buf_ring->base;
+ mhi_chan->db_cfg.db_mode = 1;
+
+ /* Update to all cores */
+ smp_wmb();
+
+ return 0;
+}
+
+static int parse_ev_cfg(struct mhi_controller *mhi_cntrl,
+ const struct mhi_controller_config *config)
+{
+ struct mhi_event *mhi_event;
+ const struct mhi_event_config *event_cfg;
+ struct device *dev = mhi_cntrl->cntrl_dev;
+ int i, num;
+
+ num = config->num_events;
+ mhi_cntrl->total_ev_rings = num;
+ mhi_cntrl->mhi_event = kcalloc(num, sizeof(*mhi_cntrl->mhi_event),
+ GFP_KERNEL);
+ if (!mhi_cntrl->mhi_event)
+ return -ENOMEM;
+
+ /* Populate event ring */
+ mhi_event = mhi_cntrl->mhi_event;
+ for (i = 0; i < num; i++) {
+ event_cfg = &config->event_cfg[i];
+
+ mhi_event->er_index = i;
+ mhi_event->ring.elements = event_cfg->num_elements;
+ mhi_event->intmod = event_cfg->irq_moderation_ms;
+ mhi_event->irq = event_cfg->irq;
+
+ if (event_cfg->channel != U32_MAX) {
+ /* This event ring has a dedicated channel */
+ mhi_event->chan = event_cfg->channel;
+ if (mhi_event->chan >= mhi_cntrl->max_chan) {
+ dev_err(dev,
+ "Event Ring channel not available\n");
+ goto error_ev_cfg;
+ }
+
+ mhi_event->mhi_chan =
+ &mhi_cntrl->mhi_chan[mhi_event->chan];
+ }
+
+ /* Priority is fixed to 1 for now */
+ mhi_event->priority = 1;
+
+ mhi_event->db_cfg.brstmode = event_cfg->mode;
+ if (MHI_INVALID_BRSTMODE(mhi_event->db_cfg.brstmode))
+ goto error_ev_cfg;
+
+ if (mhi_event->db_cfg.brstmode == MHI_DB_BRST_ENABLE)
+ mhi_event->db_cfg.process_db = mhi_db_brstmode;
+ else
+ mhi_event->db_cfg.process_db = mhi_db_brstmode_disable;
+
+ mhi_event->data_type = event_cfg->data_type;
+
+ switch (mhi_event->data_type) {
+ case MHI_ER_DATA:
+ mhi_event->process_event = mhi_process_data_event_ring;
+ break;
+ case MHI_ER_CTRL:
+ mhi_event->process_event = mhi_process_ctrl_ev_ring;
+ break;
+ default:
+ dev_err(dev, "Event Ring type not supported\n");
+ goto error_ev_cfg;
+ }
+
+ mhi_event->hw_ring = event_cfg->hardware_event;
+ if (mhi_event->hw_ring)
+ mhi_cntrl->hw_ev_rings++;
+ else
+ mhi_cntrl->sw_ev_rings++;
+
+ mhi_event->cl_manage = event_cfg->client_managed;
+ mhi_event->offload_ev = event_cfg->offload_channel;
+ mhi_event++;
+ }
+
+ return 0;
+
+error_ev_cfg:
+
+ kfree(mhi_cntrl->mhi_event);
+ return -EINVAL;
+}
+
+static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
+ const struct mhi_controller_config *config)
+{
+ const struct mhi_channel_config *ch_cfg;
+ struct device *dev = mhi_cntrl->cntrl_dev;
+ int i;
+ u32 chan;
+
+ mhi_cntrl->max_chan = config->max_channels;
+
+ /*
+ * The allocation of MHI channels can exceed 32KB in some scenarios,
+ * so to avoid any memory possible allocation failures, vzalloc is
+ * used here
+ */
+ mhi_cntrl->mhi_chan = vcalloc(mhi_cntrl->max_chan,
+ sizeof(*mhi_cntrl->mhi_chan));
+ if (!mhi_cntrl->mhi_chan)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&mhi_cntrl->lpm_chans);
+
+ /* Populate channel configurations */
+ for (i = 0; i < config->num_channels; i++) {
+ struct mhi_chan *mhi_chan;
+
+ ch_cfg = &config->ch_cfg[i];
+
+ chan = ch_cfg->num;
+ if (chan >= mhi_cntrl->max_chan) {
+ dev_err(dev, "Channel %d not available\n", chan);
+ goto error_chan_cfg;
+ }
+
+ mhi_chan = &mhi_cntrl->mhi_chan[chan];
+ mhi_chan->name = ch_cfg->name;
+ mhi_chan->chan = chan;
+
+ mhi_chan->tre_ring.elements = ch_cfg->num_elements;
+ if (!mhi_chan->tre_ring.elements)
+ goto error_chan_cfg;
+
+ /*
+ * For some channels, local ring length should be bigger than
+ * the transfer ring length due to internal logical channels
+ * in device. So host can queue much more buffers than transfer
+ * ring length. Example, RSC channels should have a larger local
+ * channel length than transfer ring length.
+ */
+ mhi_chan->buf_ring.elements = ch_cfg->local_elements;
+ if (!mhi_chan->buf_ring.elements)
+ mhi_chan->buf_ring.elements = mhi_chan->tre_ring.elements;
+ mhi_chan->er_index = ch_cfg->event_ring;
+ mhi_chan->dir = ch_cfg->dir;
+
+ /*
+ * For most channels, chtype is identical to channel directions.
+ * So, if it is not defined then assign channel direction to
+ * chtype
+ */
+ mhi_chan->type = ch_cfg->type;
+ if (!mhi_chan->type)
+ mhi_chan->type = (enum mhi_ch_type)mhi_chan->dir;
+
+ mhi_chan->ee_mask = ch_cfg->ee_mask;
+ mhi_chan->db_cfg.pollcfg = ch_cfg->pollcfg;
+ mhi_chan->lpm_notify = ch_cfg->lpm_notify;
+ mhi_chan->offload_ch = ch_cfg->offload_channel;
+ mhi_chan->db_cfg.reset_req = ch_cfg->doorbell_mode_switch;
+ mhi_chan->pre_alloc = ch_cfg->auto_queue;
+ mhi_chan->wake_capable = ch_cfg->wake_capable;
+
+ /*
+ * If MHI host allocates buffers, then the channel direction
+ * should be DMA_FROM_DEVICE
+ */
+ if (mhi_chan->pre_alloc && mhi_chan->dir != DMA_FROM_DEVICE) {
+ dev_err(dev, "Invalid channel configuration\n");
+ goto error_chan_cfg;
+ }
+
+ /*
+ * Bi-directional and direction less channel must be an
+ * offload channel
+ */
+ if ((mhi_chan->dir == DMA_BIDIRECTIONAL ||
+ mhi_chan->dir == DMA_NONE) && !mhi_chan->offload_ch) {
+ dev_err(dev, "Invalid channel configuration\n");
+ goto error_chan_cfg;
+ }
+
+ if (!mhi_chan->offload_ch) {
+ mhi_chan->db_cfg.brstmode = ch_cfg->doorbell;
+ if (MHI_INVALID_BRSTMODE(mhi_chan->db_cfg.brstmode)) {
+ dev_err(dev, "Invalid Door bell mode\n");
+ goto error_chan_cfg;
+ }
+ }
+
+ if (mhi_chan->db_cfg.brstmode == MHI_DB_BRST_ENABLE)
+ mhi_chan->db_cfg.process_db = mhi_db_brstmode;
+ else
+ mhi_chan->db_cfg.process_db = mhi_db_brstmode_disable;
+
+ mhi_chan->configured = true;
+
+ if (mhi_chan->lpm_notify)
+ list_add_tail(&mhi_chan->node, &mhi_cntrl->lpm_chans);
+ }
+
+ return 0;
+
+error_chan_cfg:
+ vfree(mhi_cntrl->mhi_chan);
+
+ return -EINVAL;
+}
+
+static int parse_config(struct mhi_controller *mhi_cntrl,
+ const struct mhi_controller_config *config)
+{
+ int ret;
+
+ /* Parse MHI channel configuration */
+ ret = parse_ch_cfg(mhi_cntrl, config);
+ if (ret)
+ return ret;
+
+ /* Parse MHI event configuration */
+ ret = parse_ev_cfg(mhi_cntrl, config);
+ if (ret)
+ goto error_ev_cfg;
+
+ mhi_cntrl->timeout_ms = config->timeout_ms;
+ if (!mhi_cntrl->timeout_ms)
+ mhi_cntrl->timeout_ms = MHI_TIMEOUT_MS;
+
+ mhi_cntrl->bounce_buf = config->use_bounce_buf;
+ mhi_cntrl->buffer_len = config->buf_len;
+ if (!mhi_cntrl->buffer_len)
+ mhi_cntrl->buffer_len = MHI_MAX_MTU;
+
+ /* By default, host is allowed to ring DB in both M0 and M2 states */
+ mhi_cntrl->db_access = MHI_PM_M0 | MHI_PM_M2;
+ if (config->m2_no_db)
+ mhi_cntrl->db_access &= ~MHI_PM_M2;
+
+ return 0;
+
+error_ev_cfg:
+ vfree(mhi_cntrl->mhi_chan);
+
+ return ret;
+}
+
+int mhi_register_controller(struct mhi_controller *mhi_cntrl,
+ const struct mhi_controller_config *config)
+{
+ struct mhi_event *mhi_event;
+ struct mhi_chan *mhi_chan;
+ struct mhi_cmd *mhi_cmd;
+ struct mhi_device *mhi_dev;
+ u32 soc_info;
+ int ret, i;
+
+ if (!mhi_cntrl || !mhi_cntrl->cntrl_dev || !mhi_cntrl->regs ||
+ !mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
+ !mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
+ !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs ||
+ !mhi_cntrl->irq || !mhi_cntrl->reg_len)
+ return -EINVAL;
+
+ ret = parse_config(mhi_cntrl, config);
+ if (ret)
+ return -EINVAL;
+
+ mhi_cntrl->mhi_cmd = kcalloc(NR_OF_CMD_RINGS,
+ sizeof(*mhi_cntrl->mhi_cmd), GFP_KERNEL);
+ if (!mhi_cntrl->mhi_cmd) {
+ ret = -ENOMEM;
+ goto err_free_event;
+ }
+
+ INIT_LIST_HEAD(&mhi_cntrl->transition_list);
+ mutex_init(&mhi_cntrl->pm_mutex);
+ rwlock_init(&mhi_cntrl->pm_lock);
+ spin_lock_init(&mhi_cntrl->transition_lock);
+ spin_lock_init(&mhi_cntrl->wlock);
+ INIT_WORK(&mhi_cntrl->st_worker, mhi_pm_st_worker);
+ init_waitqueue_head(&mhi_cntrl->state_event);
+
+ mhi_cntrl->hiprio_wq = alloc_ordered_workqueue("mhi_hiprio_wq", WQ_HIGHPRI);
+ if (!mhi_cntrl->hiprio_wq) {
+ dev_err(mhi_cntrl->cntrl_dev, "Failed to allocate workqueue\n");
+ ret = -ENOMEM;
+ goto err_free_cmd;
+ }
+
+ mhi_cmd = mhi_cntrl->mhi_cmd;
+ for (i = 0; i < NR_OF_CMD_RINGS; i++, mhi_cmd++)
+ spin_lock_init(&mhi_cmd->lock);
+
+ mhi_event = mhi_cntrl->mhi_event;
+ for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) {
+ /* Skip for offload events */
+ if (mhi_event->offload_ev)
+ continue;
+
+ mhi_event->mhi_cntrl = mhi_cntrl;
+ spin_lock_init(&mhi_event->lock);
+ if (mhi_event->data_type == MHI_ER_CTRL)
+ tasklet_init(&mhi_event->task, mhi_ctrl_ev_task,
+ (ulong)mhi_event);
+ else
+ tasklet_init(&mhi_event->task, mhi_ev_task,
+ (ulong)mhi_event);
+ }
+
+ mhi_chan = mhi_cntrl->mhi_chan;
+ for (i = 0; i < mhi_cntrl->max_chan; i++, mhi_chan++) {
+ mutex_init(&mhi_chan->mutex);
+ init_completion(&mhi_chan->completion);
+ rwlock_init(&mhi_chan->lock);
+
+ /* used in setting bei field of TRE */
+ mhi_event = &mhi_cntrl->mhi_event[mhi_chan->er_index];
+ mhi_chan->intmod = mhi_event->intmod;
+ }
+
+ if (mhi_cntrl->bounce_buf) {
+ mhi_cntrl->map_single = mhi_map_single_use_bb;
+ mhi_cntrl->unmap_single = mhi_unmap_single_use_bb;
+ } else {
+ mhi_cntrl->map_single = mhi_map_single_no_bb;
+ mhi_cntrl->unmap_single = mhi_unmap_single_no_bb;
+ }
+
+ /* Read the MHI device info */
+ ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs,
+ SOC_HW_VERSION_OFFS, &soc_info);
+ if (ret)
+ goto err_destroy_wq;
+
+ mhi_cntrl->family_number = FIELD_GET(SOC_HW_VERSION_FAM_NUM_BMSK, soc_info);
+ mhi_cntrl->device_number = FIELD_GET(SOC_HW_VERSION_DEV_NUM_BMSK, soc_info);
+ mhi_cntrl->major_version = FIELD_GET(SOC_HW_VERSION_MAJOR_VER_BMSK, soc_info);
+ mhi_cntrl->minor_version = FIELD_GET(SOC_HW_VERSION_MINOR_VER_BMSK, soc_info);
+
+ mhi_cntrl->index = ida_alloc(&mhi_controller_ida, GFP_KERNEL);
+ if (mhi_cntrl->index < 0) {
+ ret = mhi_cntrl->index;
+ goto err_destroy_wq;
+ }
+
+ ret = mhi_init_irq_setup(mhi_cntrl);
+ if (ret)
+ goto err_ida_free;
+
+ /* Register controller with MHI bus */
+ mhi_dev = mhi_alloc_device(mhi_cntrl);
+ if (IS_ERR(mhi_dev)) {
+ dev_err(mhi_cntrl->cntrl_dev, "Failed to allocate MHI device\n");
+ ret = PTR_ERR(mhi_dev);
+ goto error_setup_irq;
+ }
+
+ mhi_dev->dev_type = MHI_DEVICE_CONTROLLER;
+ mhi_dev->mhi_cntrl = mhi_cntrl;
+ dev_set_name(&mhi_dev->dev, "mhi%d", mhi_cntrl->index);
+ mhi_dev->name = dev_name(&mhi_dev->dev);
+
+ /* Init wakeup source */
+ device_init_wakeup(&mhi_dev->dev, true);
+
+ ret = device_add(&mhi_dev->dev);
+ if (ret)
+ goto err_release_dev;
+
+ mhi_cntrl->mhi_dev = mhi_dev;
+
+ mhi_create_debugfs(mhi_cntrl);
+
+ return 0;
+
+err_release_dev:
+ put_device(&mhi_dev->dev);
+error_setup_irq:
+ mhi_deinit_free_irq(mhi_cntrl);
+err_ida_free:
+ ida_free(&mhi_controller_ida, mhi_cntrl->index);
+err_destroy_wq:
+ destroy_workqueue(mhi_cntrl->hiprio_wq);
+err_free_cmd:
+ kfree(mhi_cntrl->mhi_cmd);
+err_free_event:
+ kfree(mhi_cntrl->mhi_event);
+ vfree(mhi_cntrl->mhi_chan);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mhi_register_controller);
+
+void mhi_unregister_controller(struct mhi_controller *mhi_cntrl)
+{
+ struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev;
+ struct mhi_chan *mhi_chan = mhi_cntrl->mhi_chan;
+ unsigned int i;
+
+ mhi_deinit_free_irq(mhi_cntrl);
+ mhi_destroy_debugfs(mhi_cntrl);
+
+ destroy_workqueue(mhi_cntrl->hiprio_wq);
+ kfree(mhi_cntrl->mhi_cmd);
+ kfree(mhi_cntrl->mhi_event);
+
+ /* Drop the references to MHI devices created for channels */
+ for (i = 0; i < mhi_cntrl->max_chan; i++, mhi_chan++) {
+ if (!mhi_chan->mhi_dev)
+ continue;
+
+ put_device(&mhi_chan->mhi_dev->dev);
+ }
+ vfree(mhi_cntrl->mhi_chan);
+
+ device_del(&mhi_dev->dev);
+ put_device(&mhi_dev->dev);
+
+ ida_free(&mhi_controller_ida, mhi_cntrl->index);
+}
+EXPORT_SYMBOL_GPL(mhi_unregister_controller);
+
+struct mhi_controller *mhi_alloc_controller(void)
+{
+ struct mhi_controller *mhi_cntrl;
+
+ mhi_cntrl = kzalloc(sizeof(*mhi_cntrl), GFP_KERNEL);
+
+ return mhi_cntrl;
+}
+EXPORT_SYMBOL_GPL(mhi_alloc_controller);
+
+void mhi_free_controller(struct mhi_controller *mhi_cntrl)
+{
+ kfree(mhi_cntrl);
+}
+EXPORT_SYMBOL_GPL(mhi_free_controller);
+
+int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
+{
+ struct device *dev = &mhi_cntrl->mhi_dev->dev;
+ u32 bhi_off, bhie_off;
+ int ret;
+
+ mutex_lock(&mhi_cntrl->pm_mutex);
+
+ ret = mhi_init_dev_ctxt(mhi_cntrl);
+ if (ret)
+ goto error_dev_ctxt;
+
+ ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, BHIOFF, &bhi_off);
+ if (ret) {
+ dev_err(dev, "Error getting BHI offset\n");
+ goto error_reg_offset;
+ }
+
+ if (bhi_off >= mhi_cntrl->reg_len) {
+ dev_err(dev, "BHI offset: 0x%x is out of range: 0x%zx\n",
+ bhi_off, mhi_cntrl->reg_len);
+ ret = -ERANGE;
+ goto error_reg_offset;
+ }
+ mhi_cntrl->bhi = mhi_cntrl->regs + bhi_off;
+
+ if (mhi_cntrl->fbc_download || mhi_cntrl->rddm_size) {
+ ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, BHIEOFF,
+ &bhie_off);
+ if (ret) {
+ dev_err(dev, "Error getting BHIE offset\n");
+ goto error_reg_offset;
+ }
+
+ if (bhie_off >= mhi_cntrl->reg_len) {
+ dev_err(dev,
+ "BHIe offset: 0x%x is out of range: 0x%zx\n",
+ bhie_off, mhi_cntrl->reg_len);
+ ret = -ERANGE;
+ goto error_reg_offset;
+ }
+ mhi_cntrl->bhie = mhi_cntrl->regs + bhie_off;
+ }
+
+ if (mhi_cntrl->rddm_size) {
+ /*
+ * This controller supports RDDM, so we need to manually clear
+ * BHIE RX registers since POR values are undefined.
+ */
+ memset_io(mhi_cntrl->bhie + BHIE_RXVECADDR_LOW_OFFS,
+ 0, BHIE_RXVECSTATUS_OFFS - BHIE_RXVECADDR_LOW_OFFS +
+ 4);
+ /*
+ * Allocate RDDM table for debugging purpose if specified
+ */
+ mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->rddm_image,
+ mhi_cntrl->rddm_size);
+ if (mhi_cntrl->rddm_image) {
+ ret = mhi_rddm_prepare(mhi_cntrl,
+ mhi_cntrl->rddm_image);
+ if (ret) {
+ mhi_free_bhie_table(mhi_cntrl,
+ mhi_cntrl->rddm_image);
+ goto error_reg_offset;
+ }
+ }
+ }
+
+ mutex_unlock(&mhi_cntrl->pm_mutex);
+
+ return 0;
+
+error_reg_offset:
+ mhi_deinit_dev_ctxt(mhi_cntrl);
+
+error_dev_ctxt:
+ mutex_unlock(&mhi_cntrl->pm_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mhi_prepare_for_power_up);
+
+void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl)
+{
+ if (mhi_cntrl->fbc_image) {
+ mhi_free_bhie_table(mhi_cntrl, mhi_cntrl->fbc_image);
+ mhi_cntrl->fbc_image = NULL;
+ }
+
+ if (mhi_cntrl->rddm_image) {
+ mhi_free_bhie_table(mhi_cntrl, mhi_cntrl->rddm_image);
+ mhi_cntrl->rddm_image = NULL;
+ }
+
+ mhi_cntrl->bhi = NULL;
+ mhi_cntrl->bhie = NULL;
+
+ mhi_deinit_dev_ctxt(mhi_cntrl);
+}
+EXPORT_SYMBOL_GPL(mhi_unprepare_after_power_down);
+
+static void mhi_release_device(struct device *dev)
+{
+ struct mhi_device *mhi_dev = to_mhi_device(dev);
+
+ /*
+ * We need to set the mhi_chan->mhi_dev to NULL here since the MHI
+ * devices for the channels will only get created if the mhi_dev
+ * associated with it is NULL. This scenario will happen during the
+ * controller suspend and resume.
+ */
+ if (mhi_dev->ul_chan)
+ mhi_dev->ul_chan->mhi_dev = NULL;
+
+ if (mhi_dev->dl_chan)
+ mhi_dev->dl_chan->mhi_dev = NULL;
+
+ kfree(mhi_dev);
+}
+
+struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl)
+{
+ struct mhi_device *mhi_dev;
+ struct device *dev;
+
+ mhi_dev = kzalloc(sizeof(*mhi_dev), GFP_KERNEL);
+ if (!mhi_dev)
+ return ERR_PTR(-ENOMEM);
+
+ dev = &mhi_dev->dev;
+ device_initialize(dev);
+ dev->bus = &mhi_bus_type;
+ dev->release = mhi_release_device;
+
+ if (mhi_cntrl->mhi_dev) {
+ /* for MHI client devices, parent is the MHI controller device */
+ dev->parent = &mhi_cntrl->mhi_dev->dev;
+ } else {
+ /* for MHI controller device, parent is the bus device (e.g. pci device) */
+ dev->parent = mhi_cntrl->cntrl_dev;
+ }
+
+ mhi_dev->mhi_cntrl = mhi_cntrl;
+ mhi_dev->dev_wake = 0;
+
+ return mhi_dev;
+}
+
+static int mhi_driver_probe(struct device *dev)
+{
+ struct mhi_device *mhi_dev = to_mhi_device(dev);
+ struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
+ struct device_driver *drv = dev->driver;
+ struct mhi_driver *mhi_drv = to_mhi_driver(drv);
+ struct mhi_event *mhi_event;
+ struct mhi_chan *ul_chan = mhi_dev->ul_chan;
+ struct mhi_chan *dl_chan = mhi_dev->dl_chan;
+ int ret;
+
+ /* Bring device out of LPM */
+ ret = mhi_device_get_sync(mhi_dev);
+ if (ret)
+ return ret;
+
+ ret = -EINVAL;
+
+ if (ul_chan) {
+ /*
+ * If channel supports LPM notifications then status_cb should
+ * be provided
+ */
+ if (ul_chan->lpm_notify && !mhi_drv->status_cb)
+ goto exit_probe;
+
+ /* For non-offload channels then xfer_cb should be provided */
+ if (!ul_chan->offload_ch && !mhi_drv->ul_xfer_cb)
+ goto exit_probe;
+
+ ul_chan->xfer_cb = mhi_drv->ul_xfer_cb;
+ }
+
+ ret = -EINVAL;
+ if (dl_chan) {
+ /*
+ * If channel supports LPM notifications then status_cb should
+ * be provided
+ */
+ if (dl_chan->lpm_notify && !mhi_drv->status_cb)
+ goto exit_probe;
+
+ /* For non-offload channels then xfer_cb should be provided */
+ if (!dl_chan->offload_ch && !mhi_drv->dl_xfer_cb)
+ goto exit_probe;
+
+ mhi_event = &mhi_cntrl->mhi_event[dl_chan->er_index];
+
+ /*
+ * If the channel event ring is managed by client, then
+ * status_cb must be provided so that the framework can
+ * notify pending data
+ */
+ if (mhi_event->cl_manage && !mhi_drv->status_cb)
+ goto exit_probe;
+
+ dl_chan->xfer_cb = mhi_drv->dl_xfer_cb;
+ }
+
+ /* Call the user provided probe function */
+ ret = mhi_drv->probe(mhi_dev, mhi_dev->id);
+ if (ret)
+ goto exit_probe;
+
+ mhi_device_put(mhi_dev);
+
+ return ret;
+
+exit_probe:
+ mhi_unprepare_from_transfer(mhi_dev);
+
+ mhi_device_put(mhi_dev);
+
+ return ret;
+}
+
+static int mhi_driver_remove(struct device *dev)
+{
+ struct mhi_device *mhi_dev = to_mhi_device(dev);
+ struct mhi_driver *mhi_drv = to_mhi_driver(dev->driver);
+ struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
+ struct mhi_chan *mhi_chan;
+ enum mhi_ch_state ch_state[] = {
+ MHI_CH_STATE_DISABLED,
+ MHI_CH_STATE_DISABLED
+ };
+ int dir;
+
+ /* Skip if it is a controller device */
+ if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER)
+ return 0;
+
+ /* Reset both channels */
+ for (dir = 0; dir < 2; dir++) {
+ mhi_chan = dir ? mhi_dev->ul_chan : mhi_dev->dl_chan;
+
+ if (!mhi_chan)
+ continue;
+
+ /* Wake all threads waiting for completion */
+ write_lock_irq(&mhi_chan->lock);
+ mhi_chan->ccs = MHI_EV_CC_INVALID;
+ complete_all(&mhi_chan->completion);
+ write_unlock_irq(&mhi_chan->lock);
+
+ /* Set the channel state to disabled */
+ mutex_lock(&mhi_chan->mutex);
+ write_lock_irq(&mhi_chan->lock);
+ ch_state[dir] = mhi_chan->ch_state;
+ mhi_chan->ch_state = MHI_CH_STATE_SUSPENDED;
+ write_unlock_irq(&mhi_chan->lock);
+
+ /* Reset the non-offload channel */
+ if (!mhi_chan->offload_ch)
+ mhi_reset_chan(mhi_cntrl, mhi_chan);
+
+ mutex_unlock(&mhi_chan->mutex);
+ }
+
+ mhi_drv->remove(mhi_dev);
+
+ /* De-init channel if it was enabled */
+ for (dir = 0; dir < 2; dir++) {
+ mhi_chan = dir ? mhi_dev->ul_chan : mhi_dev->dl_chan;
+
+ if (!mhi_chan)
+ continue;
+
+ mutex_lock(&mhi_chan->mutex);
+
+ if ((ch_state[dir] == MHI_CH_STATE_ENABLED ||
+ ch_state[dir] == MHI_CH_STATE_STOP) &&
+ !mhi_chan->offload_ch)
+ mhi_deinit_chan_ctxt(mhi_cntrl, mhi_chan);
+
+ mhi_chan->ch_state = MHI_CH_STATE_DISABLED;
+
+ mutex_unlock(&mhi_chan->mutex);
+ }
+
+ while (mhi_dev->dev_wake)
+ mhi_device_put(mhi_dev);
+
+ return 0;
+}
+
+int __mhi_driver_register(struct mhi_driver *mhi_drv, struct module *owner)
+{
+ struct device_driver *driver = &mhi_drv->driver;
+
+ if (!mhi_drv->probe || !mhi_drv->remove)
+ return -EINVAL;
+
+ driver->bus = &mhi_bus_type;
+ driver->owner = owner;
+ driver->probe = mhi_driver_probe;
+ driver->remove = mhi_driver_remove;
+
+ return driver_register(driver);
+}
+EXPORT_SYMBOL_GPL(__mhi_driver_register);
+
+void mhi_driver_unregister(struct mhi_driver *mhi_drv)
+{
+ driver_unregister(&mhi_drv->driver);
+}
+EXPORT_SYMBOL_GPL(mhi_driver_unregister);
+
+static int mhi_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+ const struct mhi_device *mhi_dev = to_mhi_device(dev);
+
+ return add_uevent_var(env, "MODALIAS=" MHI_DEVICE_MODALIAS_FMT,
+ mhi_dev->name);
+}
+
+static int mhi_match(struct device *dev, struct device_driver *drv)
+{
+ struct mhi_device *mhi_dev = to_mhi_device(dev);
+ struct mhi_driver *mhi_drv = to_mhi_driver(drv);
+ const struct mhi_device_id *id;
+
+ /*
+ * If the device is a controller type then there is no client driver
+ * associated with it
+ */
+ if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER)
+ return 0;
+
+ for (id = mhi_drv->id_table; id->chan[0]; id++)
+ if (!strcmp(mhi_dev->name, id->chan)) {
+ mhi_dev->id = id;
+ return 1;
+ }
+
+ return 0;
+};
+
+struct bus_type mhi_bus_type = {
+ .name = "mhi",
+ .dev_name = "mhi",
+ .match = mhi_match,
+ .uevent = mhi_uevent,
+ .dev_groups = mhi_dev_groups,
+};
+
+static int __init mhi_init(void)
+{
+ mhi_debugfs_init();
+ return bus_register(&mhi_bus_type);
+}
+
+static void __exit mhi_exit(void)
+{
+ mhi_debugfs_exit();
+ bus_unregister(&mhi_bus_type);
+}
+
+postcore_initcall(mhi_init);
+module_exit(mhi_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Modem Host Interface");