linux/drivers/soundwire/cadence_master.c

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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.
/*
* Cadence SoundWire Master module
* Used by Master driver
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw.h>
#include "bus.h"
#include "cadence_master.h"
#define CDNS_MCP_CONFIG 0x0
#define CDNS_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24)
#define CDNS_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16)
#define CDNS_MCP_CONFIG_MMASTER BIT(7)
#define CDNS_MCP_CONFIG_BUS_REL BIT(6)
#define CDNS_MCP_CONFIG_SNIFFER BIT(5)
#define CDNS_MCP_CONFIG_SSPMOD BIT(4)
#define CDNS_MCP_CONFIG_CMD BIT(3)
#define CDNS_MCP_CONFIG_OP GENMASK(2, 0)
#define CDNS_MCP_CONFIG_OP_NORMAL 0
#define CDNS_MCP_CONTROL 0x4
#define CDNS_MCP_CONTROL_RST_DELAY GENMASK(10, 8)
#define CDNS_MCP_CONTROL_CMD_RST BIT(7)
#define CDNS_MCP_CONTROL_SOFT_RST BIT(6)
#define CDNS_MCP_CONTROL_SW_RST BIT(5)
#define CDNS_MCP_CONTROL_HW_RST BIT(4)
#define CDNS_MCP_CONTROL_CLK_PAUSE BIT(3)
#define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2)
#define CDNS_MCP_CONTROL_CMD_ACCEPT BIT(1)
#define CDNS_MCP_CONTROL_BLOCK_WAKEUP BIT(0)
#define CDNS_MCP_CMDCTRL 0x8
#define CDNS_MCP_SSPSTAT 0xC
#define CDNS_MCP_FRAME_SHAPE 0x10
#define CDNS_MCP_FRAME_SHAPE_INIT 0x14
#define CDNS_MCP_CONFIG_UPDATE 0x18
#define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0)
#define CDNS_MCP_PHYCTRL 0x1C
#define CDNS_MCP_SSP_CTRL0 0x20
#define CDNS_MCP_SSP_CTRL1 0x28
#define CDNS_MCP_CLK_CTRL0 0x30
#define CDNS_MCP_CLK_CTRL1 0x38
#define CDNS_MCP_STAT 0x40
#define CDNS_MCP_STAT_ACTIVE_BANK BIT(20)
#define CDNS_MCP_STAT_CLK_STOP BIT(16)
#define CDNS_MCP_INTSTAT 0x44
#define CDNS_MCP_INTMASK 0x48
#define CDNS_MCP_INT_IRQ BIT(31)
#define CDNS_MCP_INT_WAKEUP BIT(16)
#define CDNS_MCP_INT_SLAVE_RSVD BIT(15)
#define CDNS_MCP_INT_SLAVE_ALERT BIT(14)
#define CDNS_MCP_INT_SLAVE_ATTACH BIT(13)
#define CDNS_MCP_INT_SLAVE_NATTACH BIT(12)
#define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12)
#define CDNS_MCP_INT_DPINT BIT(11)
#define CDNS_MCP_INT_CTRL_CLASH BIT(10)
#define CDNS_MCP_INT_DATA_CLASH BIT(9)
#define CDNS_MCP_INT_CMD_ERR BIT(7)
#define CDNS_MCP_INT_RX_WL BIT(2)
#define CDNS_MCP_INT_TXE BIT(1)
#define CDNS_MCP_INTSET 0x4C
#define CDNS_SDW_SLAVE_STAT 0x50
#define CDNS_MCP_SLAVE_STAT_MASK BIT(1, 0)
#define CDNS_MCP_SLAVE_INTSTAT0 0x54
#define CDNS_MCP_SLAVE_INTSTAT1 0x58
#define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0)
#define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1)
#define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2)
#define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3)
#define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0)
#define CDNS_MCP_SLAVE_STATUS_NUM 4
#define CDNS_MCP_SLAVE_INTMASK0 0x5C
#define CDNS_MCP_SLAVE_INTMASK1 0x60
#define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(30, 0)
#define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(16, 0)
#define CDNS_MCP_PORT_INTSTAT 0x64
#define CDNS_MCP_PDI_STAT 0x6C
#define CDNS_MCP_FIFOLEVEL 0x78
#define CDNS_MCP_FIFOSTAT 0x7C
#define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0)
#define CDNS_MCP_CMD_BASE 0x80
#define CDNS_MCP_RESP_BASE 0x80
#define CDNS_MCP_CMD_LEN 0x20
#define CDNS_MCP_CMD_WORD_LEN 0x4
#define CDNS_MCP_CMD_SSP_TAG BIT(31)
#define CDNS_MCP_CMD_COMMAND GENMASK(30, 28)
#define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24)
#define CDNS_MCP_CMD_REG_ADDR_H GENMASK(23, 16)
#define CDNS_MCP_CMD_REG_ADDR_L GENMASK(15, 8)
#define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0)
#define CDNS_MCP_CMD_READ 2
#define CDNS_MCP_CMD_WRITE 3
#define CDNS_MCP_RESP_RDATA GENMASK(15, 8)
#define CDNS_MCP_RESP_ACK BIT(0)
#define CDNS_MCP_RESP_NACK BIT(1)
#define CDNS_DP_SIZE 128
#define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_CONFIG_BPM BIT(18)
#define CDNS_DPN_CONFIG_BGC GENMASK(17, 16)
#define CDNS_DPN_CONFIG_WL GENMASK(12, 8)
#define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2)
#define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0)
#define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0)
#define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0)
#define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8)
#define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0)
#define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4)
#define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8)
#define CDNS_PORTCTRL 0x130
#define CDNS_PORTCTRL_DIRN BIT(7)
#define CDNS_PORTCTRL_BANK_INVERT BIT(8)
#define CDNS_PORT_OFFSET 0x80
#define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16)
#define CDNS_PDI_CONFIG_SOFT_RESET BIT(24)
#define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8)
#define CDNS_PDI_CONFIG_PORT GENMASK(4, 0)
/* Driver defaults */
#define CDNS_DEFAULT_CLK_DIVIDER 0
#define CDNS_DEFAULT_FRAME_SHAPE 0x30
#define CDNS_DEFAULT_SSP_INTERVAL 0x18
#define CDNS_TX_TIMEOUT 2000
#define CDNS_PCM_PDI_OFFSET 0x2
#define CDNS_PDM_PDI_OFFSET 0x6
#define CDNS_SCP_RX_FIFOLEVEL 0x2
/*
* register accessor helpers
*/
static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
{
return readl(cdns->registers + offset);
}
static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
{
writel(value, cdns->registers + offset);
}
static inline void cdns_updatel(struct sdw_cdns *cdns,
int offset, u32 mask, u32 val)
{
u32 tmp;
tmp = cdns_readl(cdns, offset);
tmp = (tmp & ~mask) | val;
cdns_writel(cdns, offset, tmp);
}
static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
{
int timeout = 10;
u32 reg_read;
writel(value, cdns->registers + offset);
/* Wait for bit to be self cleared */
do {
reg_read = readl(cdns->registers + offset);
if ((reg_read & value) == 0)
return 0;
timeout--;
udelay(50);
} while (timeout != 0);
return -EAGAIN;
}
/*
* IO Calls
*/
static enum sdw_command_response cdns_fill_msg_resp(
struct sdw_cdns *cdns,
struct sdw_msg *msg, int count, int offset)
{
int nack = 0, no_ack = 0;
int i;
/* check message response */
for (i = 0; i < count; i++) {
if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
no_ack = 1;
dev_dbg(cdns->dev, "Msg Ack not received\n");
if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
nack = 1;
dev_err(cdns->dev, "Msg NACK received\n");
}
}
}
if (nack) {
dev_err(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
return SDW_CMD_FAIL;
} else if (no_ack) {
dev_dbg(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
return SDW_CMD_IGNORED;
}
/* fill response */
for (i = 0; i < count; i++)
msg->buf[i + offset] = cdns->response_buf[i] >>
SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA);
return SDW_CMD_OK;
}
static enum sdw_command_response
_cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
int offset, int count, bool defer)
{
unsigned long time;
u32 base, i, data;
u16 addr;
/* Program the watermark level for RX FIFO */
if (cdns->msg_count != count) {
cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
cdns->msg_count = count;
}
base = CDNS_MCP_CMD_BASE;
addr = msg->addr;
for (i = 0; i < count; i++) {
data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
data |= addr++ << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
if (msg->flags == SDW_MSG_FLAG_WRITE)
data |= msg->buf[i + offset];
data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG);
cdns_writel(cdns, base, data);
base += CDNS_MCP_CMD_WORD_LEN;
}
if (defer)
return SDW_CMD_OK;
/* wait for timeout or response */
time = wait_for_completion_timeout(&cdns->tx_complete,
msecs_to_jiffies(CDNS_TX_TIMEOUT));
if (!time) {
dev_err(cdns->dev, "IO transfer timed out\n");
msg->len = 0;
return SDW_CMD_TIMEOUT;
}
return cdns_fill_msg_resp(cdns, msg, count, offset);
}
static enum sdw_command_response cdns_program_scp_addr(
struct sdw_cdns *cdns, struct sdw_msg *msg)
{
int nack = 0, no_ack = 0;
unsigned long time;
u32 data[2], base;
int i;
/* Program the watermark level for RX FIFO */
if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
}
data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
data[1] = data[0];
data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
data[0] |= msg->addr_page1;
data[1] |= msg->addr_page2;
base = CDNS_MCP_CMD_BASE;
cdns_writel(cdns, base, data[0]);
base += CDNS_MCP_CMD_WORD_LEN;
cdns_writel(cdns, base, data[1]);
time = wait_for_completion_timeout(&cdns->tx_complete,
msecs_to_jiffies(CDNS_TX_TIMEOUT));
if (!time) {
dev_err(cdns->dev, "SCP Msg trf timed out\n");
msg->len = 0;
return SDW_CMD_TIMEOUT;
}
/* check response the writes */
for (i = 0; i < 2; i++) {
if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
no_ack = 1;
dev_err(cdns->dev, "Program SCP Ack not received");
if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
nack = 1;
dev_err(cdns->dev, "Program SCP NACK received");
}
}
}
/* For NACK, NO ack, don't return err if we are in Broadcast mode */
if (nack) {
dev_err(cdns->dev,
"SCP_addrpage NACKed for Slave %d", msg->dev_num);
return SDW_CMD_FAIL;
} else if (no_ack) {
dev_dbg(cdns->dev,
"SCP_addrpage ignored for Slave %d", msg->dev_num);
return SDW_CMD_IGNORED;
}
return SDW_CMD_OK;
}
static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
{
int ret;
if (msg->page) {
ret = cdns_program_scp_addr(cdns, msg);
if (ret) {
msg->len = 0;
return ret;
}
}
switch (msg->flags) {
case SDW_MSG_FLAG_READ:
*cmd = CDNS_MCP_CMD_READ;
break;
case SDW_MSG_FLAG_WRITE:
*cmd = CDNS_MCP_CMD_WRITE;
break;
default:
dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
return -EINVAL;
}
return 0;
}
static enum sdw_command_response
cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
int cmd = 0, ret, i;
ret = cdns_prep_msg(cdns, msg, &cmd);
if (ret)
return SDW_CMD_FAIL_OTHER;
for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
CDNS_MCP_CMD_LEN, false);
if (ret < 0)
goto exit;
}
if (!(msg->len % CDNS_MCP_CMD_LEN))
goto exit;
ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
msg->len % CDNS_MCP_CMD_LEN, false);
exit:
return ret;
}
static enum sdw_command_response
cdns_xfer_msg_defer(struct sdw_bus *bus,
struct sdw_msg *msg, struct sdw_defer *defer)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
int cmd = 0, ret;
/* for defer only 1 message is supported */
if (msg->len > 1)
return -ENOTSUPP;
ret = cdns_prep_msg(cdns, msg, &cmd);
if (ret)
return SDW_CMD_FAIL_OTHER;
cdns->defer = defer;
cdns->defer->length = msg->len;
return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
}
static enum sdw_command_response
cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
struct sdw_msg msg;
/* Create dummy message with valid device number */
memset(&msg, 0, sizeof(msg));
msg.dev_num = dev_num;
return cdns_program_scp_addr(cdns, &msg);
}
/*
* IRQ handling
*/
static void cdns_read_response(struct sdw_cdns *cdns)
{
u32 num_resp, cmd_base;
int i;
num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
cmd_base = CDNS_MCP_CMD_BASE;
for (i = 0; i < num_resp; i++) {
cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
cmd_base += CDNS_MCP_CMD_WORD_LEN;
}
}
static int cdns_update_slave_status(struct sdw_cdns *cdns,
u32 slave0, u32 slave1)
{
enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
bool is_slave = false;
u64 slave, mask;
int i, set_status;
/* combine the two status */
slave = ((u64)slave1 << 32) | slave0;
memset(status, 0, sizeof(status));
for (i = 0; i <= SDW_MAX_DEVICES; i++) {
mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
CDNS_MCP_SLAVE_STATUS_BITS;
if (!mask)
continue;
is_slave = true;
set_status = 0;
if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
status[i] = SDW_SLAVE_RESERVED;
set_status++;
}
if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
status[i] = SDW_SLAVE_ATTACHED;
set_status++;
}
if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
status[i] = SDW_SLAVE_ALERT;
set_status++;
}
if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
status[i] = SDW_SLAVE_UNATTACHED;
set_status++;
}
/* first check if Slave reported multiple status */
if (set_status > 1) {
dev_warn(cdns->dev,
"Slave reported multiple Status: %d\n",
status[i]);
/*
* TODO: we need to reread the status here by
* issuing a PING cmd
*/
}
}
if (is_slave)
return sdw_handle_slave_status(&cdns->bus, status);
return 0;
}
/**
* sdw_cdns_irq() - Cadence interrupt handler
* @irq: irq number
* @dev_id: irq context
*/
irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
{
struct sdw_cdns *cdns = dev_id;
u32 int_status;
int ret = IRQ_HANDLED;
/* Check if the link is up */
if (!cdns->link_up)
return IRQ_NONE;
int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
if (!(int_status & CDNS_MCP_INT_IRQ))
return IRQ_NONE;
if (int_status & CDNS_MCP_INT_RX_WL) {
cdns_read_response(cdns);
if (cdns->defer) {
cdns_fill_msg_resp(cdns, cdns->defer->msg,
cdns->defer->length, 0);
complete(&cdns->defer->complete);
cdns->defer = NULL;
} else
complete(&cdns->tx_complete);
}
if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
/* Slave is driving bit slot during control word */
dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
int_status |= CDNS_MCP_INT_CTRL_CLASH;
}
if (int_status & CDNS_MCP_INT_DATA_CLASH) {
/*
* Multiple slaves trying to drive bit slot, or issue with
* ownership of data bits or Slave gone bonkers
*/
dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
int_status |= CDNS_MCP_INT_DATA_CLASH;
}
if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
/* Mask the Slave interrupt and wake thread */
cdns_updatel(cdns, CDNS_MCP_INTMASK,
CDNS_MCP_INT_SLAVE_MASK, 0);
int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
ret = IRQ_WAKE_THREAD;
}
cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
return ret;
}
EXPORT_SYMBOL(sdw_cdns_irq);
/**
* sdw_cdns_thread() - Cadence irq thread handler
* @irq: irq number
* @dev_id: irq context
*/
irqreturn_t sdw_cdns_thread(int irq, void *dev_id)
{
struct sdw_cdns *cdns = dev_id;
u32 slave0, slave1;
dev_dbg(cdns->dev, "Slave status change\n");
slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
cdns_update_slave_status(cdns, slave0, slave1);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
/* clear and unmask Slave interrupt now */
cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
cdns_updatel(cdns, CDNS_MCP_INTMASK,
CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(sdw_cdns_thread);
/*
* init routines
*/
static int _cdns_enable_interrupt(struct sdw_cdns *cdns)
{
u32 mask;
cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
CDNS_MCP_SLAVE_INTMASK0_MASK);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
CDNS_MCP_SLAVE_INTMASK1_MASK);
mask = CDNS_MCP_INT_SLAVE_RSVD | CDNS_MCP_INT_SLAVE_ALERT |
CDNS_MCP_INT_SLAVE_ATTACH | CDNS_MCP_INT_SLAVE_NATTACH |
CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
CDNS_MCP_INT_RX_WL | CDNS_MCP_INT_IRQ | CDNS_MCP_INT_DPINT;
cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
return 0;
}
/**
* sdw_cdns_enable_interrupt() - Enable SDW interrupts and update config
* @cdns: Cadence instance
*/
int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
{
int ret;
_cdns_enable_interrupt(cdns);
ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
CDNS_MCP_CONFIG_UPDATE_BIT);
if (ret < 0)
dev_err(cdns->dev, "Config update timedout");
return ret;
}
EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
/**
* sdw_cdns_init() - Cadence initialization
* @cdns: Cadence instance
*/
int sdw_cdns_init(struct sdw_cdns *cdns)
{
u32 val;
int ret;
/* Exit clock stop */
ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
CDNS_MCP_CONTROL_CLK_STOP_CLR);
if (ret < 0) {
dev_err(cdns->dev, "Couldn't exit from clock stop\n");
return ret;
}
/* Set clock divider */
val = cdns_readl(cdns, CDNS_MCP_CLK_CTRL0);
val |= CDNS_DEFAULT_CLK_DIVIDER;
cdns_writel(cdns, CDNS_MCP_CLK_CTRL0, val);
/* Set the default frame shape */
cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, CDNS_DEFAULT_FRAME_SHAPE);
/* Set SSP interval to default value */
cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, CDNS_DEFAULT_SSP_INTERVAL);
cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, CDNS_DEFAULT_SSP_INTERVAL);
/* Set cmd accept mode */
cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
CDNS_MCP_CONTROL_CMD_ACCEPT);
/* Configure mcp config */
val = cdns_readl(cdns, CDNS_MCP_CONFIG);
/* Set Max cmd retry to 15 */
val |= CDNS_MCP_CONFIG_MCMD_RETRY;
/* Set frame delay between PREQ and ping frame to 15 frames */
val |= 0xF << SDW_REG_SHIFT(CDNS_MCP_CONFIG_MPREQ_DELAY);
/* Disable auto bus release */
val &= ~CDNS_MCP_CONFIG_BUS_REL;
/* Disable sniffer mode */
val &= ~CDNS_MCP_CONFIG_SNIFFER;
/* Set cmd mode for Tx and Rx cmds */
val &= ~CDNS_MCP_CONFIG_CMD;
/* Set operation to normal */
val &= ~CDNS_MCP_CONFIG_OP;
val |= CDNS_MCP_CONFIG_OP_NORMAL;
cdns_writel(cdns, CDNS_MCP_CONFIG, val);
return 0;
}
EXPORT_SYMBOL(sdw_cdns_init);
struct sdw_master_ops sdw_cdns_master_ops = {
.read_prop = sdw_master_read_prop,
.xfer_msg = cdns_xfer_msg,
.xfer_msg_defer = cdns_xfer_msg_defer,
.reset_page_addr = cdns_reset_page_addr,
};
EXPORT_SYMBOL(sdw_cdns_master_ops);
/**
* sdw_cdns_probe() - Cadence probe routine
* @cdns: Cadence instance
*/
int sdw_cdns_probe(struct sdw_cdns *cdns)
{
init_completion(&cdns->tx_complete);
return 0;
}
EXPORT_SYMBOL(sdw_cdns_probe);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Cadence Soundwire Library");