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android_kernel_samsung_hero.../drivers/platform/msm/gsi/gsi.c
HackerOO7 2bd1731e0a init: OSRC G9300ZCU2APF7
2016-08-17 16:41:52 +08:00

2415 lines
64 KiB
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/* 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/of.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/msm_gsi.h>
#include <linux/platform_device.h>
#include "gsi.h"
#include "gsi_reg.h"
#define GSI_CMD_TIMEOUT (5*HZ)
#define GSI_STOP_CMD_TIMEOUT_MS 1
#define GSI_MAX_CH_LOW_WEIGHT 15
#define GSI_MHI_ER_START 10
#define GSI_MHI_ER_END 16
static const struct of_device_id msm_gsi_match[] = {
{ .compatible = "qcom,msm_gsi", },
{ },
};
struct gsi_ctx *gsi_ctx;
static void __gsi_config_type_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_TYPE_IRQ_MSK_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_EE_n_CNTXT_TYPE_IRQ_MSK_OFFS(ee));
}
static void __gsi_config_ch_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_GSI_CH_IRQ_MSK_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_GSI_CH_IRQ_MSK_OFFS(ee));
}
static void __gsi_config_evt_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(ee));
}
static void __gsi_config_ieob_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(ee));
}
static void __gsi_config_glob_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_GLOB_IRQ_EN_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_EE_n_CNTXT_GLOB_IRQ_EN_OFFS(ee));
}
static void __gsi_config_gen_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_GSI_IRQ_EN_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_EE_n_CNTXT_GSI_IRQ_EN_OFFS(ee));
}
static void __gsi_config_inter_ee_ch_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_INTER_EE_n_SRC_GSI_CH_IRQ_MSK_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_INTER_EE_n_SRC_GSI_CH_IRQ_MSK_OFFS(ee));
}
static void __gsi_config_inter_ee_evt_irq(int ee, uint32_t mask, uint32_t val)
{
uint32_t curr;
curr = gsi_readl(gsi_ctx->base +
GSI_INTER_EE_n_SRC_EV_CH_IRQ_MSK_OFFS(ee));
gsi_writel((curr & ~mask) | (val & mask), gsi_ctx->base +
GSI_INTER_EE_n_SRC_EV_CH_IRQ_MSK_OFFS(ee));
}
static void gsi_handle_ch_ctrl(int ee)
{
uint32_t ch;
int i;
uint32_t val;
struct gsi_chan_ctx *ctx;
ch = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_GSI_CH_IRQ_OFFS(ee));
GSIDBG("ch %x\n", ch);
for (i = 0; i < 32; i++) {
if ((1 << i) & ch) {
ctx = &gsi_ctx->chan[i];
val = gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_0_OFFS(i, ee));
ctx->state = (val &
GSI_EE_n_GSI_CH_k_CNTXT_0_CHSTATE_BMSK) >>
GSI_EE_n_GSI_CH_k_CNTXT_0_CHSTATE_SHFT;
GSIDBG("ch %u state updated to %u\n", i, ctx->state);
complete(&ctx->compl);
}
}
gsi_writel(ch, gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_GSI_CH_IRQ_CLR_OFFS(ee));
}
static void gsi_handle_ev_ctrl(int ee)
{
uint32_t ch;
int i;
uint32_t val;
struct gsi_evt_ctx *ctx;
ch = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_EV_CH_IRQ_OFFS(ee));
GSIDBG("ev %x\n", ch);
for (i = 0; i < 32; i++) {
if ((1 << i) & ch) {
ctx = &gsi_ctx->evtr[i];
val = gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_0_OFFS(i, ee));
ctx->state = (val &
GSI_EE_n_EV_CH_k_CNTXT_0_CHSTATE_BMSK) >>
GSI_EE_n_EV_CH_k_CNTXT_0_CHSTATE_SHFT;
GSIDBG("evt %u state updated to %u\n", i, ctx->state);
complete(&ctx->compl);
}
}
gsi_writel(ch, gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_EV_CH_IRQ_CLR_OFFS(ee));
}
static void gsi_handle_glob_err(uint32_t err)
{
struct gsi_log_err *log;
struct gsi_chan_ctx *ch;
struct gsi_evt_ctx *ev;
struct gsi_chan_err_notify chan_notify;
struct gsi_evt_err_notify evt_notify;
struct gsi_per_notify per_notify;
uint32_t val;
log = (struct gsi_log_err *)&err;
GSIERR("log err_type=%u ee=%u idx=%u\n", log->err_type, log->ee,
log->virt_idx);
GSIERR("code=%u arg1=%u arg2=%u arg3=%u\n", log->code, log->arg1,
log->arg2, log->arg3);
switch (log->err_type) {
case GSI_ERR_TYPE_GLOB:
per_notify.evt_id = GSI_PER_EVT_GLOB_ERROR;
per_notify.user_data = gsi_ctx->per.user_data;
per_notify.data.err_desc = err & 0xFFFF;
gsi_ctx->per.notify_cb(&per_notify);
break;
case GSI_ERR_TYPE_CHAN:
BUG_ON(log->virt_idx >= GSI_MAX_CHAN);
ch = &gsi_ctx->chan[log->virt_idx];
chan_notify.chan_user_data = ch->props.chan_user_data;
chan_notify.err_desc = err & 0xFFFF;
if (log->code == GSI_INVALID_TRE_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
val = gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_0_OFFS(log->virt_idx,
gsi_ctx->per.ee));
ch->state = (val &
GSI_EE_n_GSI_CH_k_CNTXT_0_CHSTATE_BMSK) >>
GSI_EE_n_GSI_CH_k_CNTXT_0_CHSTATE_SHFT;
GSIDBG("ch %u state updated to %u\n", log->virt_idx,
ch->state);
ch->stats.invalid_tre_error++;
BUG_ON(ch->state != GSI_CHAN_STATE_ERROR);
chan_notify.evt_id = GSI_CHAN_INVALID_TRE_ERR;
} else if (log->code == GSI_OUT_OF_BUFFERS_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
chan_notify.evt_id = GSI_CHAN_OUT_OF_BUFFERS_ERR;
} else if (log->code == GSI_OUT_OF_RESOURCES_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
chan_notify.evt_id = GSI_CHAN_OUT_OF_RESOURCES_ERR;
complete(&ch->compl);
} else if (log->code == GSI_UNSUPPORTED_INTER_EE_OP_ERR) {
chan_notify.evt_id =
GSI_CHAN_UNSUPPORTED_INTER_EE_OP_ERR;
} else if (log->code == GSI_NON_ALLOCATED_EVT_ACCESS_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
chan_notify.evt_id =
GSI_CHAN_NON_ALLOCATED_EVT_ACCESS_ERR;
} else if (log->code == GSI_HWO_1_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
chan_notify.evt_id = GSI_CHAN_HWO_1_ERR;
} else {
BUG();
}
if (ch->props.err_cb)
ch->props.err_cb(&chan_notify);
else
WARN_ON(1);
break;
case GSI_ERR_TYPE_EVT:
BUG_ON(log->virt_idx >= GSI_MAX_EVT_RING);
ev = &gsi_ctx->evtr[log->virt_idx];
evt_notify.user_data = ev->props.user_data;
evt_notify.err_desc = err & 0xFFFF;
if (log->code == GSI_OUT_OF_BUFFERS_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
evt_notify.evt_id = GSI_EVT_OUT_OF_BUFFERS_ERR;
} else if (log->code == GSI_OUT_OF_RESOURCES_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
evt_notify.evt_id = GSI_EVT_OUT_OF_RESOURCES_ERR;
complete(&ev->compl);
} else if (log->code == GSI_UNSUPPORTED_INTER_EE_OP_ERR) {
evt_notify.evt_id = GSI_EVT_UNSUPPORTED_INTER_EE_OP_ERR;
} else if (log->code == GSI_EVT_RING_EMPTY_ERR) {
BUG_ON(log->ee != gsi_ctx->per.ee);
evt_notify.evt_id = GSI_EVT_EVT_RING_EMPTY_ERR;
} else {
BUG();
}
if (ev->props.err_cb)
ev->props.err_cb(&evt_notify);
else
WARN_ON(1);
break;
default:
WARN_ON(1);
}
}
static void gsi_handle_glob_ee(int ee)
{
uint32_t val;
uint32_t err;
struct gsi_per_notify notify;
uint32_t clr = ~0;
val = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_GLOB_IRQ_STTS_OFFS(ee));
notify.user_data = gsi_ctx->per.user_data;
if (val & GSI_EE_n_CNTXT_GLOB_IRQ_STTS_ERROR_INT_BMSK) {
err = gsi_readl(gsi_ctx->base +
GSI_EE_n_ERROR_LOG_OFFS(ee));
gsi_writel(clr, gsi_ctx->base +
GSI_EE_n_ERROR_LOG_CLR_OFFS(ee));
gsi_handle_glob_err(err);
}
if (val & GSI_EE_n_CNTXT_GLOB_IRQ_EN_GP_INT1_BMSK) {
notify.evt_id = GSI_PER_EVT_GLOB_GP1;
gsi_ctx->per.notify_cb(&notify);
}
if (val & GSI_EE_n_CNTXT_GLOB_IRQ_EN_GP_INT2_BMSK) {
notify.evt_id = GSI_PER_EVT_GLOB_GP2;
gsi_ctx->per.notify_cb(&notify);
}
if (val & GSI_EE_n_CNTXT_GLOB_IRQ_EN_GP_INT3_BMSK) {
notify.evt_id = GSI_PER_EVT_GLOB_GP3;
gsi_ctx->per.notify_cb(&notify);
}
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_CNTXT_GLOB_IRQ_CLR_OFFS(ee));
}
static void gsi_incr_ring_wp(struct gsi_ring_ctx *ctx)
{
ctx->wp_local += ctx->elem_sz;
if (ctx->wp_local == ctx->end)
ctx->wp_local = ctx->base;
}
static void gsi_incr_ring_rp(struct gsi_ring_ctx *ctx)
{
ctx->rp_local += ctx->elem_sz;
if (ctx->rp_local == ctx->end)
ctx->rp_local = ctx->base;
}
static uint16_t gsi_find_idx_from_addr(struct gsi_ring_ctx *ctx, uint64_t addr)
{
BUG_ON(addr < ctx->base || addr >= ctx->end);
return (uint32_t)(addr - ctx->base)/ctx->elem_sz;
}
static void gsi_process_chan(struct gsi_xfer_compl_evt *evt,
struct gsi_chan_xfer_notify *notify, bool callback)
{
uint32_t ch_id;
struct gsi_chan_ctx *ch_ctx;
uint16_t rp_idx;
uint64_t rp;
ch_id = evt->chid;
BUG_ON(ch_id >= GSI_MAX_CHAN);
ch_ctx = &gsi_ctx->chan[ch_id];
BUG_ON(ch_ctx->props.prot != GSI_CHAN_PROT_GPI);
rp = evt->xfer_ptr;
while (ch_ctx->ring.rp_local != rp) {
gsi_incr_ring_rp(&ch_ctx->ring);
ch_ctx->stats.completed++;
}
/* the element at RP is also processed */
gsi_incr_ring_rp(&ch_ctx->ring);
ch_ctx->stats.completed++;
ch_ctx->ring.rp = ch_ctx->ring.rp_local;
rp_idx = gsi_find_idx_from_addr(&ch_ctx->ring, rp);
notify->xfer_user_data = ch_ctx->user_data[rp_idx];
notify->chan_user_data = ch_ctx->props.chan_user_data;
notify->evt_id = evt->code;
notify->bytes_xfered = evt->len;
if (callback)
ch_ctx->props.xfer_cb(notify);
}
static void gsi_process_evt_re(struct gsi_evt_ctx *ctx,
struct gsi_chan_xfer_notify *notify, bool callback)
{
struct gsi_xfer_compl_evt *evt;
uint16_t idx;
idx = gsi_find_idx_from_addr(&ctx->ring, ctx->ring.rp_local);
evt = (struct gsi_xfer_compl_evt *)(ctx->ring.base_va +
idx * ctx->ring.elem_sz);
gsi_process_chan(evt, notify, callback);
gsi_incr_ring_rp(&ctx->ring);
/* recycle this element */
gsi_incr_ring_wp(&ctx->ring);
ctx->stats.completed++;
}
static void gsi_ring_evt_doorbell(struct gsi_evt_ctx *ctx)
{
uint32_t val;
/* write order MUST be MSB followed by LSB */
val = ((ctx->ring.wp_local >> 32) &
GSI_EE_n_EV_CH_k_DOORBELL_1_WRITE_PTR_MSB_BMSK) <<
GSI_EE_n_EV_CH_k_DOORBELL_1_WRITE_PTR_MSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_DOORBELL_1_OFFS(ctx->id,
gsi_ctx->per.ee));
val = (ctx->ring.wp_local &
GSI_EE_n_EV_CH_k_DOORBELL_0_WRITE_PTR_LSB_BMSK) <<
GSI_EE_n_EV_CH_k_DOORBELL_0_WRITE_PTR_LSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_DOORBELL_0_OFFS(ctx->id,
gsi_ctx->per.ee));
}
static void gsi_ring_chan_doorbell(struct gsi_chan_ctx *ctx)
{
uint32_t val;
/* write order MUST be MSB followed by LSB */
val = ((ctx->ring.wp_local >> 32) &
GSI_EE_n_GSI_CH_k_DOORBELL_1_WRITE_PTR_MSB_BMSK) <<
GSI_EE_n_GSI_CH_k_DOORBELL_1_WRITE_PTR_MSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_DOORBELL_1_OFFS(ctx->props.ch_id,
gsi_ctx->per.ee));
val = (ctx->ring.wp_local &
GSI_EE_n_GSI_CH_k_DOORBELL_0_WRITE_PTR_LSB_BMSK) <<
GSI_EE_n_GSI_CH_k_DOORBELL_0_WRITE_PTR_LSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_DOORBELL_0_OFFS(ctx->props.ch_id,
gsi_ctx->per.ee));
}
static void gsi_handle_ieob(int ee)
{
uint32_t ch;
int i;
uint64_t rp;
struct gsi_evt_ctx *ctx;
struct gsi_chan_xfer_notify notify;
unsigned long flags;
unsigned long cntr;
uint32_t msk;
ch = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_IEOB_IRQ_OFFS(ee));
msk = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(ee));
for (i = 0; i < 32; i++) {
if ((1 << i) & ch & msk) {
ctx = &gsi_ctx->evtr[i];
BUG_ON(ctx->props.intf != GSI_EVT_CHTYPE_GPI_EV);
spin_lock_irqsave(&ctx->ring.slock, flags);
check_again:
cntr = 0;
rp = gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_4_OFFS(i, ee));
rp |= ((uint64_t)gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_5_OFFS(i, ee))) << 32;
ctx->ring.rp = rp;
while (ctx->ring.rp_local != rp) {
++cntr;
gsi_process_evt_re(ctx, &notify, true);
if (ctx->props.exclusive &&
atomic_read(&ctx->chan->poll_mode)) {
cntr = 0;
break;
}
}
gsi_ring_evt_doorbell(ctx);
if (cntr != 0)
goto check_again;
spin_unlock_irqrestore(&ctx->ring.slock, flags);
}
}
gsi_writel(ch, gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_IEOB_IRQ_CLR_OFFS(ee));
}
static void gsi_handle_inter_ee_ch_ctrl(int ee)
{
uint32_t ch;
int i;
ch = gsi_readl(gsi_ctx->base +
GSI_INTER_EE_n_SRC_GSI_CH_IRQ_OFFS(ee));
for (i = 0; i < 32; i++) {
if ((1 << i) & ch) {
/* not currently expected */
GSIERR("ch %u was inter-EE changed\n", i);
}
}
gsi_writel(ch, gsi_ctx->base +
GSI_INTER_EE_n_SRC_GSI_CH_IRQ_CLR_OFFS(ee));
}
static void gsi_handle_inter_ee_ev_ctrl(int ee)
{
uint32_t ch;
int i;
ch = gsi_readl(gsi_ctx->base +
GSI_INTER_EE_n_SRC_EV_CH_IRQ_OFFS(ee));
for (i = 0; i < 32; i++) {
if ((1 << i) & ch) {
/* not currently expected */
GSIERR("evt %u was inter-EE changed\n", i);
}
}
gsi_writel(ch, gsi_ctx->base +
GSI_INTER_EE_n_SRC_EV_CH_IRQ_CLR_OFFS(ee));
}
static void gsi_handle_general(int ee)
{
uint32_t val;
struct gsi_per_notify notify;
val = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_GSI_IRQ_STTS_OFFS(ee));
notify.user_data = gsi_ctx->per.user_data;
if (val & GSI_EE_n_CNTXT_GSI_IRQ_CLR_GSI_MCS_STACK_OVRFLOW_BMSK)
notify.evt_id = GSI_PER_EVT_GENERAL_MCS_STACK_OVERFLOW;
if (val & GSI_EE_n_CNTXT_GSI_IRQ_CLR_GSI_CMD_FIFO_OVRFLOW_BMSK)
notify.evt_id = GSI_PER_EVT_GENERAL_CMD_FIFO_OVERFLOW;
if (val & GSI_EE_n_CNTXT_GSI_IRQ_CLR_GSI_BUS_ERROR_BMSK)
notify.evt_id = GSI_PER_EVT_GENERAL_BUS_ERROR;
if (val & GSI_EE_n_CNTXT_GSI_IRQ_CLR_GSI_BREAK_POINT_BMSK)
notify.evt_id = GSI_PER_EVT_GENERAL_BREAK_POINT;
if (gsi_ctx->per.notify_cb)
gsi_ctx->per.notify_cb(&notify);
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_CNTXT_GSI_IRQ_CLR_OFFS(ee));
}
#define GSI_ISR_MAX_ITER 50
static void gsi_handle_irq(void)
{
uint32_t type;
int ee = gsi_ctx->per.ee;
unsigned long cnt = 0;
while (1) {
type = gsi_readl(gsi_ctx->base +
GSI_EE_n_CNTXT_TYPE_IRQ_OFFS(ee));
if (!type)
break;
GSIDBG("type %x\n", type);
if (type & GSI_EE_n_CNTXT_TYPE_IRQ_CH_CTRL_BMSK)
gsi_handle_ch_ctrl(ee);
if (type & GSI_EE_n_CNTXT_TYPE_IRQ_EV_CTRL_BMSK)
gsi_handle_ev_ctrl(ee);
if (type & GSI_EE_n_CNTXT_TYPE_IRQ_GLOB_EE_BMSK)
gsi_handle_glob_ee(ee);
if (type & GSI_EE_n_CNTXT_TYPE_IRQ_IEOB_BMSK)
gsi_handle_ieob(ee);
if (type & GSI_EE_n_CNTXT_TYPE_IRQ_INTER_EE_CH_CTRL_BMSK)
gsi_handle_inter_ee_ch_ctrl(ee);
if (type & GSI_EE_n_CNTXT_TYPE_IRQ_INTER_EE_EV_CTRL_BMSK)
gsi_handle_inter_ee_ev_ctrl(ee);
if (type & GSI_EE_n_CNTXT_TYPE_IRQ_GENERAL_BMSK)
gsi_handle_general(ee);
if (++cnt > GSI_ISR_MAX_ITER)
BUG();
}
}
static irqreturn_t gsi_isr(int irq, void *ctxt)
{
BUG_ON(ctxt != gsi_ctx);
if (gsi_ctx->per.req_clk_cb) {
bool granted = false;
gsi_ctx->per.req_clk_cb(gsi_ctx->per.user_data, &granted);
if (granted) {
gsi_handle_irq();
gsi_ctx->per.rel_clk_cb(gsi_ctx->per.user_data);
}
} else {
gsi_handle_irq();
}
return IRQ_HANDLED;
}
int gsi_complete_clk_grant(unsigned long dev_hdl)
{
unsigned long flags;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!gsi_ctx->per_registered) {
GSIERR("no client registered\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (dev_hdl != (uintptr_t)gsi_ctx) {
GSIERR("bad params dev_hdl=0x%lx gsi_ctx=0x%p\n", dev_hdl,
gsi_ctx);
return -GSI_STATUS_INVALID_PARAMS;
}
spin_lock_irqsave(&gsi_ctx->slock, flags);
gsi_handle_irq();
gsi_ctx->per.rel_clk_cb(gsi_ctx->per.user_data);
spin_unlock_irqrestore(&gsi_ctx->slock, flags);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_complete_clk_grant);
int gsi_register_device(struct gsi_per_props *props, unsigned long *dev_hdl)
{
int res;
uint32_t val;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!props || !dev_hdl) {
GSIERR("bad params props=%p dev_hdl=%p\n", props, dev_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
if (!props->notify_cb) {
GSIERR("notify callback must be provided\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->req_clk_cb && !props->rel_clk_cb) {
GSIERR("rel callback must be provided\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (gsi_ctx->per_registered) {
GSIERR("per already registered\n");
return -GSI_STATUS_UNSUPPORTED_OP;
}
spin_lock_init(&gsi_ctx->slock);
if (props->intr == GSI_INTR_IRQ) {
if (!props->irq) {
GSIERR("bad irq specified %u\n", props->irq);
return -GSI_STATUS_INVALID_PARAMS;
}
res = devm_request_irq(gsi_ctx->dev, props->irq,
(irq_handler_t) gsi_isr,
props->req_clk_cb ? IRQF_TRIGGER_RISING :
IRQF_TRIGGER_HIGH,
"gsi",
gsi_ctx);
if (res) {
GSIERR("failed to register isr for %u\n", props->irq);
return -GSI_STATUS_ERROR;
}
} else {
GSIERR("do not support interrupt type %u\n", props->intr);
return -GSI_STATUS_UNSUPPORTED_OP;
}
gsi_ctx->base = devm_ioremap_nocache(gsi_ctx->dev, props->phys_addr,
props->size);
if (!gsi_ctx->base) {
GSIERR("failed to remap GSI HW\n");
devm_free_irq(gsi_ctx->dev, props->irq, gsi_ctx);
return -GSI_STATUS_RES_ALLOC_FAILURE;
}
gsi_ctx->per = *props;
gsi_ctx->per_registered = true;
mutex_init(&gsi_ctx->mlock);
atomic_set(&gsi_ctx->num_chan, 0);
atomic_set(&gsi_ctx->num_evt_ring, 0);
/* only support 16 un-reserved + 7 reserved event virtual IDs */
gsi_ctx->evt_bmap = ~0x7E03FF;
/* enable all interrupts */
__gsi_config_type_irq(props->ee, ~0, ~0);
__gsi_config_ch_irq(props->ee, ~0, ~0);
__gsi_config_evt_irq(props->ee, ~0, ~0);
__gsi_config_ieob_irq(props->ee, ~0, ~0);
__gsi_config_glob_irq(props->ee, ~0, ~0);
__gsi_config_gen_irq(props->ee, ~0, ~0);
__gsi_config_inter_ee_ch_irq(props->ee, ~0, ~0);
__gsi_config_inter_ee_evt_irq(props->ee, ~0, ~0);
gsi_writel(props->intr, gsi_ctx->base +
GSI_EE_n_CNTXT_INTSET_OFFS(gsi_ctx->per.ee));
val = gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_STATUS_OFFS(gsi_ctx->per.ee));
if (val & GSI_EE_n_GSI_STATUS_ENABLED_BMSK)
gsi_ctx->enabled = true;
else
GSIERR("Manager EE has not enabled GSI, GSI un-usable\n");
*dev_hdl = (uintptr_t)gsi_ctx;
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_register_device);
int gsi_write_device_scratch(unsigned long dev_hdl,
struct gsi_device_scratch *val)
{
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!gsi_ctx->per_registered) {
GSIERR("no client registered\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (dev_hdl != (uintptr_t)gsi_ctx) {
GSIERR("bad params dev_hdl=0x%lx gsi_ctx=0x%p\n", dev_hdl,
gsi_ctx);
return -GSI_STATUS_INVALID_PARAMS;
}
if (val->max_usb_pkt_size_valid &&
val->max_usb_pkt_size != 1024 &&
val->max_usb_pkt_size != 512) {
GSIERR("bad USB max pkt size dev_hdl=0x%lx sz=%u\n", dev_hdl,
val->max_usb_pkt_size);
return -GSI_STATUS_INVALID_PARAMS;
}
mutex_lock(&gsi_ctx->mlock);
if (val->mhi_base_chan_idx_valid)
gsi_ctx->scratch.word0.s.mhi_base_chan_idx =
val->mhi_base_chan_idx;
if (val->max_usb_pkt_size_valid)
gsi_ctx->scratch.word0.s.max_usb_pkt_size =
(val->max_usb_pkt_size == 1024) ? 1 : 0;
gsi_writel(gsi_ctx->scratch.word0.val,
gsi_ctx->base +
GSI_EE_n_CNTXT_SCRATCH_0_OFFS(gsi_ctx->per.ee));
mutex_unlock(&gsi_ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_write_device_scratch);
int gsi_deregister_device(unsigned long dev_hdl, bool force)
{
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!gsi_ctx->per_registered) {
GSIERR("no client registered\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (dev_hdl != (uintptr_t)gsi_ctx) {
GSIERR("bad params dev_hdl=0x%lx gsi_ctx=0x%p\n", dev_hdl,
gsi_ctx);
return -GSI_STATUS_INVALID_PARAMS;
}
if (!force && atomic_read(&gsi_ctx->num_chan)) {
GSIERR("%u channels are allocated\n",
atomic_read(&gsi_ctx->num_chan));
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (!force && atomic_read(&gsi_ctx->num_evt_ring)) {
GSIERR("%u evt rings are allocated\n",
atomic_read(&gsi_ctx->num_evt_ring));
return -GSI_STATUS_UNSUPPORTED_OP;
}
/* disable all interrupts */
__gsi_config_type_irq(gsi_ctx->per.ee, ~0, 0);
__gsi_config_ch_irq(gsi_ctx->per.ee, ~0, 0);
__gsi_config_evt_irq(gsi_ctx->per.ee, ~0, 0);
__gsi_config_ieob_irq(gsi_ctx->per.ee, ~0, 0);
__gsi_config_glob_irq(gsi_ctx->per.ee, ~0, 0);
__gsi_config_gen_irq(gsi_ctx->per.ee, ~0, 0);
__gsi_config_inter_ee_ch_irq(gsi_ctx->per.ee, ~0, 0);
__gsi_config_inter_ee_evt_irq(gsi_ctx->per.ee, ~0, 0);
devm_free_irq(gsi_ctx->dev, gsi_ctx->per.irq, gsi_ctx);
devm_iounmap(gsi_ctx->dev, gsi_ctx->base);
memset(gsi_ctx, 0, sizeof(*gsi_ctx));
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_deregister_device);
static void gsi_program_evt_ring_ctx(struct gsi_evt_ring_props *props,
uint8_t evt_id, unsigned int ee)
{
uint32_t val;
GSIDBG("intf=%u intr=%u re=%u\n", props->intf, props->intr,
props->re_size);
val = (((props->intf << GSI_EE_n_EV_CH_k_CNTXT_0_CHTYPE_SHFT) &
GSI_EE_n_EV_CH_k_CNTXT_0_CHTYPE_BMSK) |
((props->intr << GSI_EE_n_EV_CH_k_CNTXT_0_INTYPE_SHFT) &
GSI_EE_n_EV_CH_k_CNTXT_0_INTYPE_BMSK) |
((props->re_size << GSI_EE_n_EV_CH_k_CNTXT_0_ELEMENT_SIZE_SHFT)
& GSI_EE_n_EV_CH_k_CNTXT_0_ELEMENT_SIZE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_0_OFFS(evt_id, ee));
val = (props->ring_len & GSI_EE_n_EV_CH_k_CNTXT_1_R_LENGTH_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_1_R_LENGTH_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_1_OFFS(evt_id, ee));
val = (props->ring_base_addr &
GSI_EE_n_EV_CH_k_CNTXT_2_R_BASE_ADDR_LSBS_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_2_R_BASE_ADDR_LSBS_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_2_OFFS(evt_id, ee));
val = ((props->ring_base_addr >> 32) &
GSI_EE_n_EV_CH_k_CNTXT_3_R_BASE_ADDR_MSBS_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_3_R_BASE_ADDR_MSBS_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_3_OFFS(evt_id, ee));
val = (((props->int_modt << GSI_EE_n_EV_CH_k_CNTXT_8_INT_MODT_SHFT) &
GSI_EE_n_EV_CH_k_CNTXT_8_INT_MODT_BMSK) |
((props->int_modc << GSI_EE_n_EV_CH_k_CNTXT_8_INT_MODC_SHFT) &
GSI_EE_n_EV_CH_k_CNTXT_8_INT_MODC_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_8_OFFS(evt_id, ee));
val = (props->intvec & GSI_EE_n_EV_CH_k_CNTXT_9_INTVEC_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_9_INTVEC_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_9_OFFS(evt_id, ee));
val = (props->msi_addr & GSI_EE_n_EV_CH_k_CNTXT_10_MSI_ADDR_LSB_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_10_MSI_ADDR_LSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_10_OFFS(evt_id, ee));
val = ((props->msi_addr >> 32) &
GSI_EE_n_EV_CH_k_CNTXT_11_MSI_ADDR_MSB_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_11_MSI_ADDR_MSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_11_OFFS(evt_id, ee));
val = (props->rp_update_addr &
GSI_EE_n_EV_CH_k_CNTXT_12_RP_UPDATE_ADDR_LSB_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_12_RP_UPDATE_ADDR_LSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_12_OFFS(evt_id, ee));
val = ((props->rp_update_addr >> 32) &
GSI_EE_n_EV_CH_k_CNTXT_13_RP_UPDATE_ADDR_MSB_BMSK) <<
GSI_EE_n_EV_CH_k_CNTXT_13_RP_UPDATE_ADDR_MSB_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_13_OFFS(evt_id, ee));
}
static void gsi_init_evt_ring(struct gsi_evt_ring_props *props,
struct gsi_ring_ctx *ctx)
{
ctx->base_va = (uintptr_t)props->ring_base_vaddr;
ctx->base = props->ring_base_addr;
ctx->wp = ctx->base;
ctx->rp = ctx->base;
ctx->wp_local = ctx->base;
ctx->rp_local = ctx->base;
ctx->len = props->ring_len;
ctx->elem_sz = props->re_size;
ctx->max_num_elem = ctx->len / ctx->elem_sz - 1;
ctx->end = ctx->base + (ctx->max_num_elem + 1) * ctx->elem_sz;
}
static void gsi_prime_evt_ring(struct gsi_evt_ctx *ctx)
{
unsigned long flags;
spin_lock_irqsave(&ctx->ring.slock, flags);
memset((void *)ctx->ring.base_va, 0, ctx->ring.len);
ctx->ring.wp_local = ctx->ring.base +
ctx->ring.max_num_elem * ctx->ring.elem_sz;
gsi_ring_evt_doorbell(ctx);
spin_unlock_irqrestore(&ctx->ring.slock, flags);
}
static int gsi_validate_evt_ring_props(struct gsi_evt_ring_props *props)
{
uint64_t ra;
if ((props->re_size == GSI_EVT_RING_RE_SIZE_4B &&
props->ring_len % 4) ||
(props->re_size == GSI_EVT_RING_RE_SIZE_16B &&
props->ring_len % 16)) {
GSIERR("bad params ring_len %u not a multiple of RE size %u\n",
props->ring_len, props->re_size);
return -GSI_STATUS_INVALID_PARAMS;
}
ra = props->ring_base_addr;
do_div(ra, roundup_pow_of_two(props->ring_len));
if (props->ring_base_addr != ra * roundup_pow_of_two(props->ring_len)) {
GSIERR("bad params ring base not aligned 0x%llx align 0x%lx\n",
props->ring_base_addr,
roundup_pow_of_two(props->ring_len));
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->intf == GSI_EVT_CHTYPE_GPI_EV &&
!props->ring_base_vaddr) {
GSIERR("protocol %u requires ring base VA\n", props->intf);
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->intf == GSI_EVT_CHTYPE_MHI_EV &&
(!props->evchid_valid ||
props->evchid > GSI_MHI_ER_END ||
props->evchid < GSI_MHI_ER_START)) {
GSIERR("MHI requires evchid valid=%d val=%u\n",
props->evchid_valid, props->evchid);
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->intf != GSI_EVT_CHTYPE_MHI_EV &&
props->evchid_valid) {
GSIERR("protocol %u cannot specify evchid\n", props->intf);
return -GSI_STATUS_INVALID_PARAMS;
}
if (!props->err_cb) {
GSIERR("err callback must be provided\n");
return -GSI_STATUS_INVALID_PARAMS;
}
return GSI_STATUS_SUCCESS;
}
int gsi_alloc_evt_ring(struct gsi_evt_ring_props *props, unsigned long dev_hdl,
unsigned long *evt_ring_hdl)
{
unsigned long evt_id;
enum gsi_evt_ch_cmd_opcode op = GSI_EVT_ALLOCATE;
uint32_t val;
struct gsi_evt_ctx *ctx;
int res;
int ee = gsi_ctx->per.ee;
unsigned long flags;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!props || !evt_ring_hdl || dev_hdl != (uintptr_t)gsi_ctx) {
GSIERR("bad params props=%p dev_hdl=0x%lx evt_ring_hdl=%p\n",
props, dev_hdl, evt_ring_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
if (gsi_validate_evt_ring_props(props)) {
GSIERR("invalid params\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (!props->evchid_valid) {
mutex_lock(&gsi_ctx->mlock);
evt_id = find_first_zero_bit(&gsi_ctx->evt_bmap,
sizeof(unsigned long) * BITS_PER_BYTE);
if (evt_id == sizeof(unsigned long) * BITS_PER_BYTE) {
GSIERR("failed to alloc event ID\n");
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_RES_ALLOC_FAILURE;
}
set_bit(evt_id, &gsi_ctx->evt_bmap);
mutex_unlock(&gsi_ctx->mlock);
} else {
evt_id = props->evchid;
}
GSIDBG("Using %lu as virt evt id\n", evt_id);
ctx = &gsi_ctx->evtr[evt_id];
memset(ctx, 0, sizeof(*ctx));
mutex_init(&ctx->mlock);
init_completion(&ctx->compl);
atomic_set(&ctx->chan_ref_cnt, 0);
ctx->props = *props;
mutex_lock(&gsi_ctx->mlock);
val = (((evt_id << GSI_EE_n_EV_CH_CMD_CHID_SHFT) &
GSI_EE_n_EV_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_EV_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_EV_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_CMD_OFFS(ee));
res = wait_for_completion_timeout(&ctx->compl, GSI_CMD_TIMEOUT);
if (res == 0) {
GSIERR("evt_id=%lu timed out\n", evt_id);
if (!props->evchid_valid)
clear_bit(evt_id, &gsi_ctx->evt_bmap);
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_TIMED_OUT;
}
if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
GSIERR("evt_id=%lu allocation failed state=%u\n",
evt_id, ctx->state);
if (!props->evchid_valid)
clear_bit(evt_id, &gsi_ctx->evt_bmap);
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_RES_ALLOC_FAILURE;
}
gsi_program_evt_ring_ctx(props, evt_id, gsi_ctx->per.ee);
spin_lock_init(&ctx->ring.slock);
gsi_init_evt_ring(props, &ctx->ring);
ctx->id = evt_id;
*evt_ring_hdl = evt_id;
atomic_inc(&gsi_ctx->num_evt_ring);
if (props->intf == GSI_EVT_CHTYPE_GPI_EV)
gsi_prime_evt_ring(ctx);
mutex_unlock(&gsi_ctx->mlock);
spin_lock_irqsave(&gsi_ctx->slock, flags);
gsi_writel(1 << evt_id, gsi_ctx->base +
GSI_EE_n_CNTXT_SRC_IEOB_IRQ_CLR_OFFS(ee));
if (props->intf != GSI_EVT_CHTYPE_GPI_EV)
__gsi_config_ieob_irq(gsi_ctx->per.ee, 1 << evt_id, 0);
else
__gsi_config_ieob_irq(gsi_ctx->per.ee, 1 << ctx->id, ~0);
spin_unlock_irqrestore(&gsi_ctx->slock, flags);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_alloc_evt_ring);
static void __gsi_write_evt_ring_scratch(unsigned long evt_ring_hdl,
union __packed gsi_evt_scratch val)
{
gsi_writel(val.data.word1, gsi_ctx->base +
GSI_EE_n_EV_CH_k_SCRATCH_0_OFFS(evt_ring_hdl,
gsi_ctx->per.ee));
gsi_writel(val.data.word2, gsi_ctx->base +
GSI_EE_n_EV_CH_k_SCRATCH_1_OFFS(evt_ring_hdl,
gsi_ctx->per.ee));
}
int gsi_write_evt_ring_scratch(unsigned long evt_ring_hdl,
union __packed gsi_evt_scratch val)
{
struct gsi_evt_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (evt_ring_hdl >= GSI_MAX_EVT_RING) {
GSIERR("bad params evt_ring_hdl=%lu\n", evt_ring_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->evtr[evt_ring_hdl];
if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
GSIERR("bad state %d\n",
gsi_ctx->evtr[evt_ring_hdl].state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&ctx->mlock);
ctx->scratch = val;
__gsi_write_evt_ring_scratch(evt_ring_hdl, val);
mutex_unlock(&ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_write_evt_ring_scratch);
int gsi_dealloc_evt_ring(unsigned long evt_ring_hdl)
{
uint32_t val;
enum gsi_evt_ch_cmd_opcode op = GSI_EVT_DE_ALLOC;
struct gsi_evt_ctx *ctx;
int res;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (evt_ring_hdl >= GSI_MAX_EVT_RING) {
GSIERR("bad params evt_ring_hdl=%lu\n", evt_ring_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->evtr[evt_ring_hdl];
if (atomic_read(&ctx->chan_ref_cnt)) {
GSIERR("%d channels still using this event ring\n",
atomic_read(&ctx->chan_ref_cnt));
return -GSI_STATUS_UNSUPPORTED_OP;
}
/* TODO: add check for ERROR state */
if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&gsi_ctx->mlock);
val = (((evt_ring_hdl << GSI_EE_n_EV_CH_CMD_CHID_SHFT) &
GSI_EE_n_EV_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_EV_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_EV_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_CMD_OFFS(gsi_ctx->per.ee));
res = wait_for_completion_timeout(&ctx->compl, GSI_CMD_TIMEOUT);
if (res == 0) {
GSIERR("evt_id=%lu timed out\n", evt_ring_hdl);
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_TIMED_OUT;
}
if (ctx->state != GSI_EVT_RING_STATE_NOT_ALLOCATED) {
GSIERR("evt_id=%lu unexpected state=%u\n", evt_ring_hdl,
ctx->state);
BUG();
}
mutex_unlock(&gsi_ctx->mlock);
if (!ctx->props.evchid_valid) {
mutex_lock(&gsi_ctx->mlock);
clear_bit(evt_ring_hdl, &gsi_ctx->evt_bmap);
mutex_unlock(&gsi_ctx->mlock);
}
atomic_dec(&gsi_ctx->num_evt_ring);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_dealloc_evt_ring);
int gsi_query_evt_ring_db_addr(unsigned long evt_ring_hdl,
uint32_t *db_addr_wp_lsb, uint32_t *db_addr_wp_msb)
{
struct gsi_evt_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!db_addr_wp_msb || !db_addr_wp_lsb) {
GSIERR("bad params msb=%p lsb=%p\n", db_addr_wp_msb,
db_addr_wp_lsb);
return -GSI_STATUS_INVALID_PARAMS;
}
if (evt_ring_hdl >= GSI_MAX_EVT_RING) {
GSIERR("bad params evt_ring_hdl=%lu\n", evt_ring_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->evtr[evt_ring_hdl];
if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
GSIERR("bad state %d\n",
gsi_ctx->evtr[evt_ring_hdl].state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
*db_addr_wp_lsb = gsi_ctx->per.phys_addr +
GSI_EE_n_EV_CH_k_DOORBELL_0_OFFS(evt_ring_hdl, gsi_ctx->per.ee);
*db_addr_wp_msb = gsi_ctx->per.phys_addr +
GSI_EE_n_EV_CH_k_DOORBELL_1_OFFS(evt_ring_hdl, gsi_ctx->per.ee);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_query_evt_ring_db_addr);
int gsi_reset_evt_ring(unsigned long evt_ring_hdl)
{
uint32_t val;
enum gsi_evt_ch_cmd_opcode op = GSI_EVT_RESET;
struct gsi_evt_ctx *ctx;
int res;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (evt_ring_hdl >= GSI_MAX_EVT_RING) {
GSIERR("bad params evt_ring_hdl=%lu\n", evt_ring_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->evtr[evt_ring_hdl];
if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&gsi_ctx->mlock);
val = (((evt_ring_hdl << GSI_EE_n_EV_CH_CMD_CHID_SHFT) &
GSI_EE_n_EV_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_EV_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_EV_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_EV_CH_CMD_OFFS(gsi_ctx->per.ee));
res = wait_for_completion_timeout(&ctx->compl, GSI_CMD_TIMEOUT);
if (res == 0) {
GSIERR("evt_id=%lu timed out\n", evt_ring_hdl);
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_TIMED_OUT;
}
if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
GSIERR("evt_id=%lu unexpected state=%u\n", evt_ring_hdl,
ctx->state);
BUG();
}
gsi_program_evt_ring_ctx(&ctx->props, evt_ring_hdl, gsi_ctx->per.ee);
gsi_init_evt_ring(&ctx->props, &ctx->ring);
/* restore scratch */
__gsi_write_evt_ring_scratch(evt_ring_hdl, ctx->scratch);
if (ctx->props.intf == GSI_EVT_CHTYPE_GPI_EV)
gsi_prime_evt_ring(ctx);
mutex_unlock(&gsi_ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_reset_evt_ring);
int gsi_get_evt_ring_cfg(unsigned long evt_ring_hdl,
struct gsi_evt_ring_props *props, union gsi_evt_scratch *scr)
{
struct gsi_evt_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!props || !scr) {
GSIERR("bad params props=%p scr=%p\n", props, scr);
return -GSI_STATUS_INVALID_PARAMS;
}
if (evt_ring_hdl >= GSI_MAX_EVT_RING) {
GSIERR("bad params evt_ring_hdl=%lu\n", evt_ring_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->evtr[evt_ring_hdl];
if (ctx->state == GSI_EVT_RING_STATE_NOT_ALLOCATED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&ctx->mlock);
*props = ctx->props;
*scr = ctx->scratch;
mutex_unlock(&ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_get_evt_ring_cfg);
int gsi_set_evt_ring_cfg(unsigned long evt_ring_hdl,
struct gsi_evt_ring_props *props, union gsi_evt_scratch *scr)
{
struct gsi_evt_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!props || gsi_validate_evt_ring_props(props)) {
GSIERR("bad params props=%p\n", props);
return -GSI_STATUS_INVALID_PARAMS;
}
if (evt_ring_hdl >= GSI_MAX_EVT_RING) {
GSIERR("bad params evt_ring_hdl=%lu\n", evt_ring_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->evtr[evt_ring_hdl];
if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (ctx->props.exclusive != props->exclusive) {
GSIERR("changing immutable fields not supported\n");
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&ctx->mlock);
ctx->props = *props;
if (scr)
ctx->scratch = *scr;
mutex_unlock(&ctx->mlock);
return gsi_reset_evt_ring(evt_ring_hdl);
}
EXPORT_SYMBOL(gsi_set_evt_ring_cfg);
static void gsi_program_chan_ctx(struct gsi_chan_props *props, unsigned int ee,
uint8_t erindex)
{
uint32_t val;
val = (((props->prot << GSI_EE_n_GSI_CH_k_CNTXT_0_CHTYPE_PROTOCOL_SHFT)
& GSI_EE_n_GSI_CH_k_CNTXT_0_CHTYPE_PROTOCOL_BMSK) |
((props->dir << GSI_EE_n_GSI_CH_k_CNTXT_0_CHTYPE_DIR_SHFT) &
GSI_EE_n_GSI_CH_k_CNTXT_0_CHTYPE_DIR_BMSK) |
((erindex << GSI_EE_n_GSI_CH_k_CNTXT_0_ERINDEX_SHFT) &
GSI_EE_n_GSI_CH_k_CNTXT_0_ERINDEX_BMSK) |
((props->re_size << GSI_EE_n_GSI_CH_k_CNTXT_0_ELEMENT_SIZE_SHFT)
& GSI_EE_n_GSI_CH_k_CNTXT_0_ELEMENT_SIZE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_0_OFFS(props->ch_id, ee));
val = (props->ring_len & GSI_EE_n_GSI_CH_k_CNTXT_1_R_LENGTH_BMSK) <<
GSI_EE_n_GSI_CH_k_CNTXT_1_R_LENGTH_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_1_OFFS(props->ch_id, ee));
val = (props->ring_base_addr &
GSI_EE_n_GSI_CH_k_CNTXT_2_R_BASE_ADDR_LSBS_BMSK) <<
GSI_EE_n_GSI_CH_k_CNTXT_2_R_BASE_ADDR_LSBS_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_2_OFFS(props->ch_id, ee));
val = ((props->ring_base_addr >> 32) &
GSI_EE_n_GSI_CH_k_CNTXT_3_R_BASE_ADDR_MSBS_BMSK) <<
GSI_EE_n_GSI_CH_k_CNTXT_3_R_BASE_ADDR_MSBS_SHFT;
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_3_OFFS(props->ch_id, ee));
val = (((props->low_weight << GSI_EE_n_GSI_CH_k_QOS_WRR_WEIGHT_SHFT) &
GSI_EE_n_GSI_CH_k_QOS_WRR_WEIGHT_BMSK) |
((props->max_prefetch <<
GSI_EE_n_GSI_CH_k_QOS_MAX_PREFETCH_SHFT) &
GSI_EE_n_GSI_CH_k_QOS_MAX_PREFETCH_BMSK) |
((props->use_db_eng << GSI_EE_n_GSI_CH_k_QOS_USE_DB_ENG_SHFT) &
GSI_EE_n_GSI_CH_k_QOS_USE_DB_ENG_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_QOS_OFFS(props->ch_id, ee));
}
static void gsi_init_chan_ring(struct gsi_chan_props *props,
struct gsi_ring_ctx *ctx)
{
ctx->base_va = (uintptr_t)props->ring_base_vaddr;
ctx->base = props->ring_base_addr;
ctx->wp = ctx->base;
ctx->rp = ctx->base;
ctx->wp_local = ctx->base;
ctx->rp_local = ctx->base;
ctx->len = props->ring_len;
ctx->elem_sz = props->re_size;
ctx->max_num_elem = ctx->len / ctx->elem_sz - 1;
ctx->end = ctx->base + (ctx->max_num_elem + 1) *
ctx->elem_sz;
}
static int gsi_validate_channel_props(struct gsi_chan_props *props)
{
uint64_t ra;
if (props->ch_id >= GSI_MAX_CHAN) {
GSIERR("ch_id %u invalid\n", props->ch_id);
return -GSI_STATUS_INVALID_PARAMS;
}
if ((props->re_size == GSI_CHAN_RE_SIZE_4B &&
props->ring_len % 4) ||
(props->re_size == GSI_CHAN_RE_SIZE_16B &&
props->ring_len % 16) ||
(props->re_size == GSI_CHAN_RE_SIZE_32B &&
props->ring_len % 32)) {
GSIERR("bad params ring_len %u not a multiple of re size %u\n",
props->ring_len, props->re_size);
return -GSI_STATUS_INVALID_PARAMS;
}
ra = props->ring_base_addr;
do_div(ra, roundup_pow_of_two(props->ring_len));
if (props->ring_base_addr != ra * roundup_pow_of_two(props->ring_len)) {
GSIERR("bad params ring base not aligned 0x%llx align 0x%lx\n",
props->ring_base_addr,
roundup_pow_of_two(props->ring_len));
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->prot == GSI_CHAN_PROT_GPI &&
!props->ring_base_vaddr) {
GSIERR("protocol %u requires ring base VA\n", props->prot);
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->low_weight > GSI_MAX_CH_LOW_WEIGHT) {
GSIERR("invalid channel low weight %u\n", props->low_weight);
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->prot == GSI_CHAN_PROT_GPI && !props->xfer_cb) {
GSIERR("xfer callback must be provided\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (!props->err_cb) {
GSIERR("err callback must be provided\n");
return -GSI_STATUS_INVALID_PARAMS;
}
return GSI_STATUS_SUCCESS;
}
int gsi_alloc_channel(struct gsi_chan_props *props, unsigned long dev_hdl,
unsigned long *chan_hdl)
{
struct gsi_chan_ctx *ctx;
uint32_t val;
int res;
int ee = gsi_ctx->per.ee;
enum gsi_ch_cmd_opcode op = GSI_CH_ALLOCATE;
uint8_t erindex;
void **user_data;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!props || !chan_hdl || dev_hdl != (uintptr_t)gsi_ctx) {
GSIERR("bad params props=%p dev_hdl=0x%lx chan_hdl=%p\n",
props, dev_hdl, chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
if (gsi_validate_channel_props(props)) {
GSIERR("bad params\n");
return -GSI_STATUS_INVALID_PARAMS;
}
if (props->evt_ring_hdl != ~0 &&
atomic_read(&gsi_ctx->evtr[props->evt_ring_hdl].chan_ref_cnt) &&
gsi_ctx->evtr[props->evt_ring_hdl].props.exclusive) {
GSIERR("evt ring=%lu already in exclusive use chan_hdl=%p\n",
props->evt_ring_hdl, chan_hdl);
return -GSI_STATUS_UNSUPPORTED_OP;
}
ctx = &gsi_ctx->chan[props->ch_id];
if (ctx->allocated) {
GSIERR("chan %d already allocated\n", props->ch_id);
return -GSI_STATUS_NODEV;
}
memset(ctx, 0, sizeof(*ctx));
user_data = devm_kzalloc(gsi_ctx->dev,
(props->ring_len / props->re_size) * sizeof(void *),
GFP_KERNEL);
if (user_data == NULL) {
GSIERR("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_RES_ALLOC_FAILURE;
}
mutex_init(&ctx->mlock);
init_completion(&ctx->compl);
atomic_set(&ctx->poll_mode, GSI_CHAN_MODE_CALLBACK);
ctx->props = *props;
mutex_lock(&gsi_ctx->mlock);
val = (((props->ch_id << GSI_EE_n_GSI_CH_CMD_CHID_SHFT) &
GSI_EE_n_GSI_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_GSI_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_GSI_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_CMD_OFFS(ee));
res = wait_for_completion_timeout(&ctx->compl, GSI_CMD_TIMEOUT);
if (res == 0) {
GSIERR("chan_hdl=%u timed out\n", props->ch_id);
mutex_unlock(&gsi_ctx->mlock);
devm_kfree(gsi_ctx->dev, user_data);
return -GSI_STATUS_TIMED_OUT;
}
if (ctx->state != GSI_CHAN_STATE_ALLOCATED) {
GSIERR("chan_hdl=%u allocation failed state=%d\n",
props->ch_id, ctx->state);
mutex_unlock(&gsi_ctx->mlock);
devm_kfree(gsi_ctx->dev, user_data);
return -GSI_STATUS_RES_ALLOC_FAILURE;
}
mutex_unlock(&gsi_ctx->mlock);
erindex = props->evt_ring_hdl != ~0 ? props->evt_ring_hdl :
GSI_NO_EVT_ERINDEX;
if (erindex != GSI_NO_EVT_ERINDEX) {
ctx->evtr = &gsi_ctx->evtr[erindex];
atomic_inc(&ctx->evtr->chan_ref_cnt);
if (ctx->evtr->props.exclusive)
ctx->evtr->chan = ctx;
}
gsi_program_chan_ctx(props, gsi_ctx->per.ee, erindex);
spin_lock_init(&ctx->ring.slock);
gsi_init_chan_ring(props, &ctx->ring);
ctx->user_data = user_data;
*chan_hdl = props->ch_id;
ctx->allocated = true;
atomic_inc(&gsi_ctx->num_chan);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_alloc_channel);
static void __gsi_write_channel_scratch(unsigned long chan_hdl,
union __packed gsi_channel_scratch val)
{
uint32_t reg;
gsi_writel(val.data.word1, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_SCRATCH_0_OFFS(chan_hdl,
gsi_ctx->per.ee));
gsi_writel(val.data.word2, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_SCRATCH_1_OFFS(chan_hdl,
gsi_ctx->per.ee));
gsi_writel(val.data.word3, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_SCRATCH_2_OFFS(chan_hdl,
gsi_ctx->per.ee));
/* below sequence is not atomic. assumption is sequencer specific fields
* will remain unchanged across this sequence
*/
reg = gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_SCRATCH_3_OFFS(chan_hdl,
gsi_ctx->per.ee));
reg &= 0xFFFF;
reg |= (val.data.word4 & 0xFFFF0000);
gsi_writel(reg, gsi_ctx->base +
GSI_EE_n_GSI_CH_k_SCRATCH_3_OFFS(chan_hdl,
gsi_ctx->per.ee));
}
int gsi_write_channel_scratch(unsigned long chan_hdl,
union __packed gsi_channel_scratch val)
{
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
if (gsi_ctx->chan[chan_hdl].state != GSI_CHAN_STATE_ALLOCATED &&
gsi_ctx->chan[chan_hdl].state != GSI_CHAN_STATE_STOPPED) {
GSIERR("bad state %d\n",
gsi_ctx->chan[chan_hdl].state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
ctx = &gsi_ctx->chan[chan_hdl];
mutex_lock(&ctx->mlock);
ctx->scratch = val;
__gsi_write_channel_scratch(chan_hdl, val);
mutex_unlock(&ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_write_channel_scratch);
int gsi_query_channel_db_addr(unsigned long chan_hdl,
uint32_t *db_addr_wp_lsb, uint32_t *db_addr_wp_msb)
{
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!db_addr_wp_msb || !db_addr_wp_lsb) {
GSIERR("bad params msb=%p lsb=%p\n", db_addr_wp_msb,
db_addr_wp_lsb);
return -GSI_STATUS_INVALID_PARAMS;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
if (gsi_ctx->chan[chan_hdl].state == GSI_CHAN_STATE_NOT_ALLOCATED) {
GSIERR("bad state %d\n",
gsi_ctx->chan[chan_hdl].state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
*db_addr_wp_lsb = gsi_ctx->per.phys_addr +
GSI_EE_n_GSI_CH_k_DOORBELL_0_OFFS(chan_hdl, gsi_ctx->per.ee);
*db_addr_wp_msb = gsi_ctx->per.phys_addr +
GSI_EE_n_GSI_CH_k_DOORBELL_1_OFFS(chan_hdl, gsi_ctx->per.ee);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_query_channel_db_addr);
int gsi_start_channel(unsigned long chan_hdl)
{
enum gsi_ch_cmd_opcode op = GSI_CH_START;
int res;
uint32_t val;
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->state != GSI_CHAN_STATE_ALLOCATED &&
ctx->state != GSI_CHAN_STATE_STOP_IN_PROC &&
ctx->state != GSI_CHAN_STATE_STOPPED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&gsi_ctx->mlock);
init_completion(&ctx->compl);
val = (((chan_hdl << GSI_EE_n_GSI_CH_CMD_CHID_SHFT) &
GSI_EE_n_GSI_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_GSI_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_GSI_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_CMD_OFFS(gsi_ctx->per.ee));
res = wait_for_completion_timeout(&ctx->compl, GSI_CMD_TIMEOUT);
if (res == 0) {
GSIERR("chan_hdl=%lu timed out\n", chan_hdl);
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_TIMED_OUT;
}
if (ctx->state != GSI_CHAN_STATE_STARTED) {
GSIERR("chan=%lu unexpected state=%u\n", chan_hdl, ctx->state);
BUG();
}
mutex_unlock(&gsi_ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_start_channel);
int gsi_stop_channel(unsigned long chan_hdl)
{
enum gsi_ch_cmd_opcode op = GSI_CH_STOP;
int res;
uint32_t val;
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->state == GSI_CHAN_STATE_STOPPED) {
GSIDBG("chan_hdl=%lu already stopped\n", chan_hdl);
return GSI_STATUS_SUCCESS;
}
if (ctx->state != GSI_CHAN_STATE_STARTED &&
ctx->state != GSI_CHAN_STATE_STOP_IN_PROC &&
ctx->state != GSI_CHAN_STATE_ERROR) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&gsi_ctx->mlock);
init_completion(&ctx->compl);
val = (((chan_hdl << GSI_EE_n_GSI_CH_CMD_CHID_SHFT) &
GSI_EE_n_GSI_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_GSI_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_GSI_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_CMD_OFFS(gsi_ctx->per.ee));
res = wait_for_completion_timeout(&ctx->compl,
msecs_to_jiffies(GSI_STOP_CMD_TIMEOUT_MS));
if (res == 0) {
GSIERR("chan_hdl=%lu timed out\n", chan_hdl);
res = -GSI_STATUS_TIMED_OUT;
goto free_lock;
}
if (ctx->state != GSI_CHAN_STATE_STOPPED &&
ctx->state != GSI_CHAN_STATE_STOP_IN_PROC) {
GSIERR("chan=%lu unexpected state=%u\n", chan_hdl, ctx->state);
res = -GSI_STATUS_BAD_STATE;
goto free_lock;
}
if (ctx->state == GSI_CHAN_STATE_STOP_IN_PROC) {
GSIERR("chan=%lu busy try again\n", chan_hdl);
res = -GSI_STATUS_AGAIN;
goto free_lock;
}
res = GSI_STATUS_SUCCESS;
free_lock:
mutex_unlock(&gsi_ctx->mlock);
return res;
}
EXPORT_SYMBOL(gsi_stop_channel);
int gsi_stop_db_channel(unsigned long chan_hdl)
{
enum gsi_ch_cmd_opcode op = GSI_CH_DB_STOP;
int res;
uint32_t val;
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->state == GSI_CHAN_STATE_STOPPED) {
GSIDBG("chan_hdl=%lu already stopped\n", chan_hdl);
return GSI_STATUS_SUCCESS;
}
if (ctx->state != GSI_CHAN_STATE_STARTED &&
ctx->state != GSI_CHAN_STATE_STOP_IN_PROC) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&gsi_ctx->mlock);
init_completion(&ctx->compl);
val = (((chan_hdl << GSI_EE_n_GSI_CH_CMD_CHID_SHFT) &
GSI_EE_n_GSI_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_GSI_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_GSI_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_CMD_OFFS(gsi_ctx->per.ee));
res = wait_for_completion_timeout(&ctx->compl,
msecs_to_jiffies(GSI_STOP_CMD_TIMEOUT_MS));
if (res == 0) {
GSIERR("chan_hdl=%lu timed out\n", chan_hdl);
res = -GSI_STATUS_TIMED_OUT;
goto free_lock;
}
if (ctx->state != GSI_CHAN_STATE_STOPPED &&
ctx->state != GSI_CHAN_STATE_STOP_IN_PROC) {
GSIERR("chan=%lu unexpected state=%u\n", chan_hdl, ctx->state);
res = -GSI_STATUS_BAD_STATE;
goto free_lock;
}
if (ctx->state == GSI_CHAN_STATE_STOP_IN_PROC) {
GSIERR("chan=%lu busy try again\n", chan_hdl);
res = -GSI_STATUS_AGAIN;
goto free_lock;
}
res = GSI_STATUS_SUCCESS;
free_lock:
mutex_unlock(&gsi_ctx->mlock);
return res;
}
EXPORT_SYMBOL(gsi_stop_db_channel);
int gsi_reset_channel(unsigned long chan_hdl)
{
enum gsi_ch_cmd_opcode op = GSI_CH_RESET;
int res;
uint32_t val;
struct gsi_chan_ctx *ctx;
bool reset_done = false;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->state != GSI_CHAN_STATE_STOPPED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&gsi_ctx->mlock);
reset:
init_completion(&ctx->compl);
val = (((chan_hdl << GSI_EE_n_GSI_CH_CMD_CHID_SHFT) &
GSI_EE_n_GSI_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_GSI_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_GSI_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_CMD_OFFS(gsi_ctx->per.ee));
res = wait_for_completion_timeout(&ctx->compl, GSI_CMD_TIMEOUT);
if (res == 0) {
GSIERR("chan_hdl=%lu timed out\n", chan_hdl);
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_TIMED_OUT;
}
if (ctx->state != GSI_CHAN_STATE_ALLOCATED) {
GSIERR("chan_hdl=%lu unexpected state=%u\n", chan_hdl,
ctx->state);
BUG();
}
/* workaround: reset GSI producers again */
if (ctx->props.dir == GSI_CHAN_DIR_FROM_GSI && !reset_done) {
reset_done = true;
goto reset;
}
gsi_program_chan_ctx(&ctx->props, gsi_ctx->per.ee,
ctx->evtr ? ctx->evtr->id : GSI_NO_EVT_ERINDEX);
gsi_init_chan_ring(&ctx->props, &ctx->ring);
/* restore scratch */
__gsi_write_channel_scratch(chan_hdl, ctx->scratch);
mutex_unlock(&gsi_ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_reset_channel);
int gsi_dealloc_channel(unsigned long chan_hdl)
{
enum gsi_ch_cmd_opcode op = GSI_CH_DE_ALLOC;
int res;
uint32_t val;
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->state != GSI_CHAN_STATE_ALLOCATED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&gsi_ctx->mlock);
init_completion(&ctx->compl);
val = (((chan_hdl << GSI_EE_n_GSI_CH_CMD_CHID_SHFT) &
GSI_EE_n_GSI_CH_CMD_CHID_BMSK) |
((op << GSI_EE_n_GSI_CH_CMD_OPCODE_SHFT) &
GSI_EE_n_GSI_CH_CMD_OPCODE_BMSK));
gsi_writel(val, gsi_ctx->base +
GSI_EE_n_GSI_CH_CMD_OFFS(gsi_ctx->per.ee));
res = wait_for_completion_timeout(&ctx->compl, GSI_CMD_TIMEOUT);
if (res == 0) {
GSIERR("chan_hdl=%lu timed out\n", chan_hdl);
mutex_unlock(&gsi_ctx->mlock);
return -GSI_STATUS_TIMED_OUT;
}
if (ctx->state != GSI_CHAN_STATE_NOT_ALLOCATED) {
GSIERR("chan_hdl=%lu unexpected state=%u\n", chan_hdl,
ctx->state);
BUG();
}
mutex_unlock(&gsi_ctx->mlock);
devm_kfree(gsi_ctx->dev, ctx->user_data);
ctx->allocated = false;
if (ctx->evtr)
atomic_dec(&ctx->evtr->chan_ref_cnt);
atomic_dec(&gsi_ctx->num_chan);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_dealloc_channel);
static void __gsi_query_channel_free_re(struct gsi_chan_ctx *ctx,
uint16_t *num_free_re)
{
uint16_t start;
uint16_t end;
uint64_t rp;
int ee = gsi_ctx->per.ee;
uint16_t used;
if (!ctx->evtr) {
rp = gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_4_OFFS(ctx->props.ch_id, ee));
rp |= ((uint64_t)gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_5_OFFS(ctx->props.ch_id, ee)))
<< 32;
ctx->ring.rp = rp;
} else {
rp = ctx->ring.rp_local;
}
start = gsi_find_idx_from_addr(&ctx->ring, rp);
end = gsi_find_idx_from_addr(&ctx->ring, ctx->ring.wp_local);
if (end >= start)
used = end - start;
else
used = ctx->ring.max_num_elem + 1 - (end - start);
*num_free_re = ctx->ring.max_num_elem - used;
}
int gsi_query_channel_info(unsigned long chan_hdl,
struct gsi_chan_info *info)
{
struct gsi_chan_ctx *ctx;
spinlock_t *slock;
unsigned long flags;
uint64_t rp;
uint64_t wp;
int ee = gsi_ctx->per.ee;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN || !info) {
GSIERR("bad params chan_hdl=%lu info=%p\n", chan_hdl, info);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->evtr) {
slock = &ctx->evtr->ring.slock;
info->evt_valid = true;
} else {
slock = &ctx->ring.slock;
info->evt_valid = false;
}
spin_lock_irqsave(slock, flags);
rp = gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_4_OFFS(ctx->props.ch_id, ee));
rp |= ((uint64_t)gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_5_OFFS(ctx->props.ch_id, ee))) << 32;
ctx->ring.rp = rp;
info->rp = rp;
wp = gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_6_OFFS(ctx->props.ch_id, ee));
wp |= ((uint64_t)gsi_readl(gsi_ctx->base +
GSI_EE_n_GSI_CH_k_CNTXT_7_OFFS(ctx->props.ch_id, ee))) << 32;
ctx->ring.wp = wp;
info->wp = wp;
if (info->evt_valid) {
rp = gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_4_OFFS(ctx->evtr->id, ee));
rp |= ((uint64_t)gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_5_OFFS(ctx->evtr->id, ee)))
<< 32;
info->evt_rp = rp;
wp = gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_6_OFFS(ctx->evtr->id, ee));
wp |= ((uint64_t)gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_7_OFFS(ctx->evtr->id, ee)))
<< 32;
info->evt_wp = wp;
}
spin_unlock_irqrestore(slock, flags);
GSIDBG("ch=%lu RP=0x%llx WP=0x%llx ev_valid=%d ERP=0x%llx EWP=0x%llx\n",
chan_hdl, info->rp, info->wp,
info->evt_valid, info->evt_rp, info->evt_wp);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_query_channel_info);
int gsi_queue_xfer(unsigned long chan_hdl, uint16_t num_xfers,
struct gsi_xfer_elem *xfer, bool ring_db)
{
struct gsi_chan_ctx *ctx;
uint16_t free;
struct gsi_tre *tre;
uint16_t idx;
uint64_t wp_rollback;
int i;
spinlock_t *slock;
unsigned long flags;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN || !num_xfers || !xfer) {
GSIERR("bad params chan_hdl=%lu num_xfers=%u xfer=%p\n",
chan_hdl, num_xfers, xfer);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->props.prot != GSI_CHAN_PROT_GPI) {
GSIERR("op not supported for protocol %u\n", ctx->props.prot);
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (ctx->evtr)
slock = &ctx->evtr->ring.slock;
else
slock = &ctx->ring.slock;
spin_lock_irqsave(slock, flags);
__gsi_query_channel_free_re(ctx, &free);
if (num_xfers > free) {
GSIERR("chan_hdl=%lu num_xfers=%u free=%u\n",
chan_hdl, num_xfers, free);
spin_unlock_irqrestore(slock, flags);
return -GSI_STATUS_RING_INSUFFICIENT_SPACE;
}
wp_rollback = ctx->ring.wp_local;
for (i = 0; i < num_xfers; i++) {
idx = gsi_find_idx_from_addr(&ctx->ring, ctx->ring.wp_local);
tre = (struct gsi_tre *)(ctx->ring.base_va +
idx * ctx->ring.elem_sz);
memset(tre, 0, sizeof(*tre));
tre->buffer_ptr = xfer[i].addr;
tre->buf_len = xfer[i].len;
if (xfer[i].type == GSI_XFER_ELEM_DATA) {
tre->re_type = GSI_RE_XFER;
} else if (xfer[i].type == GSI_XFER_ELEM_IMME_CMD) {
tre->re_type = GSI_RE_IMMD_CMD;
} else {
GSIERR("chan_hdl=%lu bad RE type=%u\n", chan_hdl,
xfer[i].type);
break;
}
tre->bei = (xfer[i].flags & GSI_XFER_FLAG_BEI) ? 1 : 0;
tre->ieot = (xfer[i].flags & GSI_XFER_FLAG_EOT) ? 1 : 0;
tre->ieob = (xfer[i].flags & GSI_XFER_FLAG_EOB) ? 1 : 0;
tre->chain = (xfer[i].flags & GSI_XFER_FLAG_CHAIN) ? 1 : 0;
ctx->user_data[idx] = xfer[i].xfer_user_data;
gsi_incr_ring_wp(&ctx->ring);
}
if (i != num_xfers) {
/* reject all the xfers */
ctx->ring.wp_local = wp_rollback;
spin_unlock_irqrestore(slock, flags);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx->stats.queued += num_xfers;
/* ensure TRE is set before ringing doorbell */
wmb();
if (ring_db)
gsi_ring_chan_doorbell(ctx);
spin_unlock_irqrestore(slock, flags);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_queue_xfer);
int gsi_start_xfer(unsigned long chan_hdl)
{
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->props.prot != GSI_CHAN_PROT_GPI) {
GSIERR("op not supported for protocol %u\n", ctx->props.prot);
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (ctx->state != GSI_CHAN_STATE_STARTED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
gsi_ring_chan_doorbell(ctx);
return GSI_STATUS_SUCCESS;
};
EXPORT_SYMBOL(gsi_start_xfer);
int gsi_poll_channel(unsigned long chan_hdl,
struct gsi_chan_xfer_notify *notify)
{
struct gsi_chan_ctx *ctx;
uint64_t rp;
int ee = gsi_ctx->per.ee;
unsigned long flags;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN || !notify) {
GSIERR("bad params chan_hdl=%lu notify=%p\n", chan_hdl, notify);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->props.prot != GSI_CHAN_PROT_GPI) {
GSIERR("op not supported for protocol %u\n", ctx->props.prot);
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (!ctx->evtr) {
GSIERR("no event ring associated chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_UNSUPPORTED_OP;
}
spin_lock_irqsave(&ctx->evtr->ring.slock, flags);
rp = gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_4_OFFS(ctx->evtr->id, ee));
rp |= ((uint64_t)gsi_readl(gsi_ctx->base +
GSI_EE_n_EV_CH_k_CNTXT_5_OFFS(ctx->evtr->id, ee))) << 32;
ctx->evtr->ring.rp = rp;
if (rp == ctx->evtr->ring.rp_local) {
spin_unlock_irqrestore(&ctx->evtr->ring.slock, flags);
ctx->stats.poll_empty++;
return GSI_STATUS_POLL_EMPTY;
}
gsi_process_evt_re(ctx->evtr, notify, false);
gsi_ring_evt_doorbell(ctx->evtr);
spin_unlock_irqrestore(&ctx->evtr->ring.slock, flags);
ctx->stats.poll_ok++;
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_poll_channel);
int gsi_config_channel_mode(unsigned long chan_hdl, enum gsi_chan_mode mode)
{
struct gsi_chan_ctx *ctx;
enum gsi_chan_mode curr;
unsigned long flags;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu mode=%u\n", chan_hdl, mode);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->props.prot != GSI_CHAN_PROT_GPI) {
GSIERR("op not supported for protocol %u\n", ctx->props.prot);
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (!ctx->evtr || !ctx->evtr->props.exclusive) {
GSIERR("cannot configure mode on chan_hdl=%lu\n",
chan_hdl);
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (atomic_read(&ctx->poll_mode))
curr = GSI_CHAN_MODE_POLL;
else
curr = GSI_CHAN_MODE_CALLBACK;
if (mode == curr) {
GSIERR("already in requested mode %u chan_hdl=%lu\n",
curr, chan_hdl);
return -GSI_STATUS_UNSUPPORTED_OP;
}
spin_lock_irqsave(&gsi_ctx->slock, flags);
if (curr == GSI_CHAN_MODE_CALLBACK &&
mode == GSI_CHAN_MODE_POLL) {
__gsi_config_ieob_irq(gsi_ctx->per.ee, 1 << ctx->evtr->id, 0);
ctx->stats.callback_to_poll++;
}
if (curr == GSI_CHAN_MODE_POLL &&
mode == GSI_CHAN_MODE_CALLBACK) {
__gsi_config_ieob_irq(gsi_ctx->per.ee, 1 << ctx->evtr->id, ~0);
ctx->stats.poll_to_callback++;
}
atomic_set(&ctx->poll_mode, mode);
spin_unlock_irqrestore(&gsi_ctx->slock, flags);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_config_channel_mode);
int gsi_get_channel_cfg(unsigned long chan_hdl, struct gsi_chan_props *props,
union gsi_channel_scratch *scr)
{
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!props || !scr) {
GSIERR("bad params props=%p scr=%p\n", props, scr);
return -GSI_STATUS_INVALID_PARAMS;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->state == GSI_CHAN_STATE_NOT_ALLOCATED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&ctx->mlock);
*props = ctx->props;
*scr = ctx->scratch;
mutex_unlock(&ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_get_channel_cfg);
int gsi_set_channel_cfg(unsigned long chan_hdl, struct gsi_chan_props *props,
union gsi_channel_scratch *scr)
{
struct gsi_chan_ctx *ctx;
if (!gsi_ctx) {
pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
return -GSI_STATUS_NODEV;
}
if (!props || gsi_validate_channel_props(props)) {
GSIERR("bad params props=%p\n", props);
return -GSI_STATUS_INVALID_PARAMS;
}
if (chan_hdl >= GSI_MAX_CHAN) {
GSIERR("bad params chan_hdl=%lu\n", chan_hdl);
return -GSI_STATUS_INVALID_PARAMS;
}
ctx = &gsi_ctx->chan[chan_hdl];
if (ctx->state != GSI_CHAN_STATE_ALLOCATED) {
GSIERR("bad state %d\n", ctx->state);
return -GSI_STATUS_UNSUPPORTED_OP;
}
if (ctx->props.ch_id != props->ch_id ||
ctx->props.evt_ring_hdl != props->evt_ring_hdl) {
GSIERR("changing immutable fields not supported\n");
return -GSI_STATUS_UNSUPPORTED_OP;
}
mutex_lock(&ctx->mlock);
ctx->props = *props;
if (scr)
ctx->scratch = *scr;
gsi_program_chan_ctx(&ctx->props, gsi_ctx->per.ee,
ctx->evtr ? ctx->evtr->id : GSI_NO_EVT_ERINDEX);
gsi_init_chan_ring(&ctx->props, &ctx->ring);
/* restore scratch */
__gsi_write_channel_scratch(chan_hdl, ctx->scratch);
mutex_unlock(&ctx->mlock);
return GSI_STATUS_SUCCESS;
}
EXPORT_SYMBOL(gsi_set_channel_cfg);
static int msm_gsi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
pr_debug("gsi_probe\n");
gsi_ctx = devm_kzalloc(dev, sizeof(*gsi_ctx), GFP_KERNEL);
if (!gsi_ctx) {
dev_err(dev, "failed to allocated gsi context\n");
return -ENOMEM;
}
gsi_ctx->dev = dev;
gsi_debugfs_init();
return 0;
}
static struct platform_driver msm_gsi_driver = {
.probe = msm_gsi_probe,
.driver = {
.owner = THIS_MODULE,
.name = "gsi",
.of_match_table = msm_gsi_match,
},
};
/**
* Module Init.
*/
static int __init gsi_init(void)
{
pr_debug("gsi_init\n");
return platform_driver_register(&msm_gsi_driver);
}
arch_initcall(gsi_init);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Generic Software Interface (GSI)");
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