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linuxdebug/drivers/soundwire/cadence_master.c

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null pointer error
2024-07-16 15:50:57 +02:00
// 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/debugfs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/pm_runtime.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/workqueue.h>
#include "bus.h"
#include "cadence_master.h"
static int interrupt_mask;
module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
#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_CMDCTRL_INSERT_PARITY_ERR BIT(2)
#define CDNS_MCP_SSPSTAT 0xC
#define CDNS_MCP_FRAME_SHAPE 0x10
#define CDNS_MCP_FRAME_SHAPE_INIT 0x14
#define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0)
#define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3)
#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_CLK_MCLKD_MASK GENMASK(7, 0)
#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_RESERVED1 GENMASK(30, 17)
#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_PARITY BIT(8)
#define CDNS_MCP_INT_CMD_ERR BIT(7)
#define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4)
#define CDNS_MCP_INT_RX_NE BIT(3)
#define CDNS_MCP_INT_RX_WL BIT(2)
#define CDNS_MCP_INT_TXE BIT(1)
#define CDNS_MCP_INT_TXF BIT(0)
#define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
#define CDNS_MCP_INTSET 0x4C
#define CDNS_MCP_SLAVE_STAT 0x50
#define CDNS_MCP_SLAVE_STAT_MASK GENMASK(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(31, 0)
#define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 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
/* FIFO can hold 8 commands */
#define CDNS_MCP_CMD_LEN 8
#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 GENMASK(23, 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_TEST_FAILED BIT(1)
#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_TX_TIMEOUT 500
#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_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
{
int timeout = 10;
u32 reg_read;
/* Wait for bit to be set */
do {
reg_read = readl(cdns->registers + offset);
if ((reg_read & mask) == value)
return 0;
timeout--;
usleep_range(50, 100);
} while (timeout != 0);
return -ETIMEDOUT;
}
static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
{
writel(value, cdns->registers + offset);
/* Wait for bit to be self cleared */
return cdns_set_wait(cdns, offset, value, 0);
}
/*
* all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
* need to be confirmed with a write to MCP_CONFIG_UPDATE
*/
static int cdns_config_update(struct sdw_cdns *cdns)
{
int ret;
if (sdw_cdns_is_clock_stop(cdns)) {
dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
return -EINVAL;
}
ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
CDNS_MCP_CONFIG_UPDATE_BIT);
if (ret < 0)
dev_err(cdns->dev, "Config update timedout\n");
return ret;
}
/*
* debugfs
*/
#ifdef CONFIG_DEBUG_FS
#define RD_BUF (2 * PAGE_SIZE)
static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
char *buf, size_t pos, unsigned int reg)
{
return scnprintf(buf + pos, RD_BUF - pos,
"%4x\t%8x\n", reg, cdns_readl(cdns, reg));
}
static int cdns_reg_show(struct seq_file *s, void *data)
{
struct sdw_cdns *cdns = s->private;
char *buf;
ssize_t ret;
int num_ports;
int i, j;
buf = kzalloc(RD_BUF, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = scnprintf(buf, RD_BUF, "Register Value\n");
ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
/* 8 MCP registers */
for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, i);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nStatus & Intr Registers\n");
/* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, i);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nSSP & Clk ctrl Registers\n");
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDPn B0 Registers\n");
num_ports = cdns->num_ports;
for (i = 0; i < num_ports; i++) {
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDP-%d\n", i);
for (j = CDNS_DPN_B0_CONFIG(i);
j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, j);
}
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDPn B1 Registers\n");
for (i = 0; i < num_ports; i++) {
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDP-%d\n", i);
for (j = CDNS_DPN_B1_CONFIG(i);
j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, j);
}
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDPn Control Registers\n");
for (i = 0; i < num_ports; i++)
ret += cdns_sprintf(cdns, buf, ret,
CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nPDIn Config Registers\n");
/* number of PDI and ports is interchangeable */
for (i = 0; i < num_ports; i++)
ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
seq_printf(s, "%s", buf);
kfree(buf);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(cdns_reg);
static int cdns_hw_reset(void *data, u64 value)
{
struct sdw_cdns *cdns = data;
int ret;
if (value != 1)
return -EINVAL;
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
ret = sdw_cdns_exit_reset(cdns);
dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
return ret;
}
DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
static int cdns_parity_error_injection(void *data, u64 value)
{
struct sdw_cdns *cdns = data;
struct sdw_bus *bus;
int ret;
if (value != 1)
return -EINVAL;
bus = &cdns->bus;
/*
* Resume Master device. If this results in a bus reset, the
* Slave devices will re-attach and be re-enumerated.
*/
ret = pm_runtime_resume_and_get(bus->dev);
if (ret < 0 && ret != -EACCES) {
dev_err_ratelimited(cdns->dev,
"pm_runtime_resume_and_get failed in %s, ret %d\n",
__func__, ret);
return ret;
}
/*
* wait long enough for Slave(s) to be in steady state. This
* does not need to be super precise.
*/
msleep(200);
/*
* Take the bus lock here to make sure that any bus transactions
* will be queued while we inject a parity error on a dummy read
*/
mutex_lock(&bus->bus_lock);
/* program hardware to inject parity error */
cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR);
/* commit changes */
cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
CDNS_MCP_CONFIG_UPDATE_BIT,
CDNS_MCP_CONFIG_UPDATE_BIT);
/* do a broadcast dummy read to avoid bus clashes */
ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
dev_info(cdns->dev, "parity error injection, read: %d\n", ret);
/* program hardware to disable parity error */
cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
0);
/* commit changes */
cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
CDNS_MCP_CONFIG_UPDATE_BIT,
CDNS_MCP_CONFIG_UPDATE_BIT);
/* Continue bus operation with parity error injection disabled */
mutex_unlock(&bus->bus_lock);
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
/*
* allow Master device to enter pm_runtime suspend. This may
* also result in Slave devices suspending.
*/
pm_runtime_mark_last_busy(bus->dev);
pm_runtime_put_autosuspend(bus->dev);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
cdns_parity_error_injection, "%llu\n");
static int cdns_set_pdi_loopback_source(void *data, u64 value)
{
struct sdw_cdns *cdns = data;
unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;
if (value > pdi_out_num)
return -EINVAL;
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
cdns->pdi_loopback_source = value;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");
static int cdns_set_pdi_loopback_target(void *data, u64 value)
{
struct sdw_cdns *cdns = data;
unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;
if (value > pdi_in_num)
return -EINVAL;
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
cdns->pdi_loopback_target = value;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");
/**
* sdw_cdns_debugfs_init() - Cadence debugfs init
* @cdns: Cadence instance
* @root: debugfs root
*/
void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
{
debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
&cdns_hw_reset_fops);
debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
&cdns_parity_error_fops);
cdns->pdi_loopback_source = -1;
cdns->pdi_loopback_target = -1;
debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
&cdns_pdi_loopback_source_fops);
debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
&cdns_pdi_loopback_target_fops);
}
EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
#endif /* CONFIG_DEBUG_FS */
/*
* 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_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
}
if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
nack = 1;
dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
}
}
if (nack) {
dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
return SDW_CMD_FAIL;
}
if (no_ack) {
dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
return SDW_CMD_IGNORED;
}
if (msg->flags == SDW_MSG_FLAG_READ) {
/* fill response */
for (i = 0; i < count; i++)
msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
cdns->response_buf[i]);
}
return SDW_CMD_OK;
}
static void cdns_read_response(struct sdw_cdns *cdns)
{
u32 num_resp, cmd_base;
int i;
/* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */
BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2);
num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
if (num_resp > ARRAY_SIZE(cdns->response_buf)) {
dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp);
num_resp = ARRAY_SIZE(cdns->response_buf);
}
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 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 + offset;
for (i = 0; i < count; i++) {
data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
addr++;
if (msg->flags == SDW_MSG_FLAG_WRITE)
data |= msg->buf[i + offset];
data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
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, cmd %d device %d addr %x len %d\n",
cmd, msg->dev_num, msg->addr, msg->len);
msg->len = 0;
/* Drain anything in the RX_FIFO */
cdns_read_response(cdns);
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] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
data[1] = data[0];
data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
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\n");
if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
nack = 1;
dev_err(cdns->dev, "Program SCP NACK received\n");
}
}
}
/* For NACK, NO ack, don't return err if we are in Broadcast mode */
if (nack) {
dev_err_ratelimited(cdns->dev,
"SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
return SDW_CMD_FAIL;
}
if (no_ack) {
dev_dbg_ratelimited(cdns->dev,
"SCP_addrpage ignored for Slave %d\n", 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;
}
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 != SDW_CMD_OK)
return ret;
}
if (!(msg->len % CDNS_MCP_CMD_LEN))
return SDW_CMD_OK;
return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
msg->len % CDNS_MCP_CMD_LEN, false);
}
EXPORT_SYMBOL(cdns_xfer_msg);
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);
}
EXPORT_SYMBOL(cdns_xfer_msg_defer);
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);
}
EXPORT_SYMBOL(cdns_reset_page_addr);
u32 cdns_read_ping_status(struct sdw_bus *bus)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
}
EXPORT_SYMBOL(cdns_read_ping_status);
/*
* IRQ handling
*/
static int cdns_update_slave_status(struct sdw_cdns *cdns,
u64 slave_intstat)
{
enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
bool is_slave = false;
u32 mask;
u32 val;
int i, set_status;
memset(status, 0, sizeof(status));
for (i = 0; i <= SDW_MAX_DEVICES; i++) {
mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
CDNS_MCP_SLAVE_STATUS_BITS;
set_status = 0;
if (mask) {
is_slave = true;
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++;
}
}
/*
* check that there was a single reported Slave status and when
* there is not use the latest status extracted from PING commands
*/
if (set_status != 1) {
val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
val >>= (i * 2);
switch (val & 0x3) {
case 0:
status[i] = SDW_SLAVE_UNATTACHED;
break;
case 1:
status[i] = SDW_SLAVE_ATTACHED;
break;
case 2:
status[i] = SDW_SLAVE_ALERT;
break;
case 3:
default:
status[i] = SDW_SLAVE_RESERVED;
break;
}
}
}
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;
/* Check if the link is up */
if (!cdns->link_up)
return IRQ_NONE;
int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
/* check for reserved values read as zero */
if (int_status & CDNS_MCP_INT_RESERVED)
return IRQ_NONE;
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_PARITY) {
/* Parity error detected by Master */
dev_err_ratelimited(cdns->dev, "Parity error\n");
}
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");
}
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");
}
if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
int_status & CDNS_MCP_INT_DPINT) {
u32 port_intstat;
/* just log which ports report an error */
port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
port_intstat);
/* clear status w/ write1 */
cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
}
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;
/*
* Deal with possible race condition between interrupt
* handling and disabling interrupts on suspend.
*
* If the master is in the process of disabling
* interrupts, don't schedule a workqueue
*/
if (cdns->interrupt_enabled)
schedule_work(&cdns->work);
}
cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(sdw_cdns_irq);
/**
* cdns_update_slave_status_work - update slave status in a work since we will need to handle
* other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
* process.
* @work: cdns worker thread
*/
static void cdns_update_slave_status_work(struct work_struct *work)
{
struct sdw_cdns *cdns =
container_of(work, struct sdw_cdns, work);
u32 slave0, slave1;
u64 slave_intstat;
u32 device0_status;
int retry_count = 0;
/*
* Clear main interrupt first so we don't lose any assertions
* that happen during this function.
*/
cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
/*
* Clear the bits before handling so we don't lose any
* bits that re-assert.
*/
cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
/* combine the two status */
slave_intstat = ((u64)slave1 << 32) | slave0;
dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
update_status:
cdns_update_slave_status(cdns, slave_intstat);
/*
* When there is more than one peripheral per link, it's
* possible that a deviceB becomes attached after we deal with
* the attachment of deviceA. Since the hardware does a
* logical AND, the attachment of the second device does not
* change the status seen by the driver.
*
* In that case, clearing the registers above would result in
* the deviceB never being detected - until a change of status
* is observed on the bus.
*
* To avoid this race condition, re-check if any device0 needs
* attention with PING commands. There is no need to check for
* ALERTS since they are not allowed until a non-zero
* device_number is assigned.
*
* Do not clear the INTSTAT0/1. While looping to enumerate devices on
* #0 there could be status changes on other devices - these must
* be kept in the INTSTAT so they can be handled when all #0 devices
* have been handled.
*/
device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
device0_status &= 3;
if (device0_status == SDW_SLAVE_ATTACHED) {
if (retry_count++ < SDW_MAX_DEVICES) {
dev_dbg_ratelimited(cdns->dev,
"Device0 detected after clearing status, iteration %d\n",
retry_count);
slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;
goto update_status;
} else {
dev_err_ratelimited(cdns->dev,
"Device0 detected after %d iterations\n",
retry_count);
}
}
/* unmask Slave interrupt now */
cdns_updatel(cdns, CDNS_MCP_INTMASK,
CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
}
/* paranoia check to make sure self-cleared bits are indeed cleared */
void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
bool initial_delay, int reset_iterations)
{
u32 mcp_control;
u32 mcp_config_update;
int i;
if (initial_delay)
usleep_range(1000, 1500);
mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
/* the following bits should be cleared immediately */
if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
i = 0;
while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
if (i == reset_iterations) {
dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
break;
}
dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
i++;
usleep_range(1000, 1500);
mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
}
}
EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
/*
* init routines
*/
/**
* sdw_cdns_exit_reset() - Program reset parameters and start bus operations
* @cdns: Cadence instance
*/
int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
{
/* keep reset delay unchanged to 4096 cycles */
/* use hardware generated reset */
cdns_updatel(cdns, CDNS_MCP_CONTROL,
CDNS_MCP_CONTROL_HW_RST,
CDNS_MCP_CONTROL_HW_RST);
/* commit changes */
cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
CDNS_MCP_CONFIG_UPDATE_BIT,
CDNS_MCP_CONFIG_UPDATE_BIT);
/* don't wait here */
return 0;
}
EXPORT_SYMBOL(sdw_cdns_exit_reset);
/**
* cdns_enable_slave_interrupts() - Enable SDW slave interrupts
* @cdns: Cadence instance
* @state: boolean for true/false
*/
static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
{
u32 mask;
mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
if (state)
mask |= CDNS_MCP_INT_SLAVE_MASK;
else
mask &= ~CDNS_MCP_INT_SLAVE_MASK;
cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
}
/**
* sdw_cdns_enable_interrupt() - Enable SDW interrupts
* @cdns: Cadence instance
* @state: True if we are trying to enable interrupt.
*/
int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
{
u32 slave_intmask0 = 0;
u32 slave_intmask1 = 0;
u32 mask = 0;
if (!state)
goto update_masks;
slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
/* enable detection of all slave state changes */
mask = CDNS_MCP_INT_SLAVE_MASK;
/* enable detection of bus issues */
mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
CDNS_MCP_INT_PARITY;
/* port interrupt limited to test modes for now */
if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
mask |= CDNS_MCP_INT_DPINT;
/* enable detection of RX fifo level */
mask |= CDNS_MCP_INT_RX_WL;
/*
* CDNS_MCP_INT_IRQ needs to be set otherwise all previous
* settings are irrelevant
*/
mask |= CDNS_MCP_INT_IRQ;
if (interrupt_mask) /* parameter override */
mask = interrupt_mask;
update_masks:
/* clear slave interrupt status before enabling interrupt */
if (state) {
u32 slave_state;
slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
}
cdns->interrupt_enabled = state;
/*
* Complete any on-going status updates before updating masks,
* and cancel queued status updates.
*
* There could be a race with a new interrupt thrown before
* the 3 mask updates below are complete, so in the interrupt
* we use the 'interrupt_enabled' status to prevent new work
* from being queued.
*/
if (!state)
cancel_work_sync(&cdns->work);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
return 0;
}
EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
static int cdns_allocate_pdi(struct sdw_cdns *cdns,
struct sdw_cdns_pdi **stream,
u32 num, u32 pdi_offset)
{
struct sdw_cdns_pdi *pdi;
int i;
if (!num)
return 0;
pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
if (!pdi)
return -ENOMEM;
for (i = 0; i < num; i++) {
pdi[i].num = i + pdi_offset;
}
*stream = pdi;
return 0;
}
/**
* sdw_cdns_pdi_init() - PDI initialization routine
*
* @cdns: Cadence instance
* @config: Stream configurations
*/
int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
struct sdw_cdns_stream_config config)
{
struct sdw_cdns_streams *stream;
int offset;
int ret;
cdns->pcm.num_bd = config.pcm_bd;
cdns->pcm.num_in = config.pcm_in;
cdns->pcm.num_out = config.pcm_out;
/* Allocate PDIs for PCMs */
stream = &cdns->pcm;
/* we allocate PDI0 and PDI1 which are used for Bulk */
offset = 0;
ret = cdns_allocate_pdi(cdns, &stream->bd,
stream->num_bd, offset);
if (ret)
return ret;
offset += stream->num_bd;
ret = cdns_allocate_pdi(cdns, &stream->in,
stream->num_in, offset);
if (ret)
return ret;
offset += stream->num_in;
ret = cdns_allocate_pdi(cdns, &stream->out,
stream->num_out, offset);
if (ret)
return ret;
/* Update total number of PCM PDIs */
stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
cdns->num_ports = stream->num_pdi;
return 0;
}
EXPORT_SYMBOL(sdw_cdns_pdi_init);
static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
{
u32 val;
int c;
int r;
r = sdw_find_row_index(n_rows);
c = sdw_find_col_index(n_cols);
val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
return val;
}
static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
{
struct sdw_bus *bus = &cdns->bus;
struct sdw_master_prop *prop = &bus->prop;
u32 val;
u32 ssp_interval;
int divider;
/* Set clock divider */
divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
CDNS_MCP_CLK_MCLKD_MASK, divider);
cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
CDNS_MCP_CLK_MCLKD_MASK, divider);
/*
* Frame shape changes after initialization have to be done
* with the bank switch mechanism
*/
val = cdns_set_initial_frame_shape(prop->default_row,
prop->default_col);
cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
/* Set SSP interval to default value */
ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
}
/**
* sdw_cdns_init() - Cadence initialization
* @cdns: Cadence instance
*/
int sdw_cdns_init(struct sdw_cdns *cdns)
{
u32 val;
cdns_init_clock_ctrl(cdns);
sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
/* reset msg_count to default value of FIFOLEVEL */
cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
/* flush command FIFOs */
cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
CDNS_MCP_CONTROL_CMD_RST);
/* 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);
/* enable bus operations with clock and data */
val &= ~CDNS_MCP_CONFIG_OP;
val |= CDNS_MCP_CONFIG_OP_NORMAL;
/* Set cmd mode for Tx and Rx cmds */
val &= ~CDNS_MCP_CONFIG_CMD;
/* Disable sniffer mode */
val &= ~CDNS_MCP_CONFIG_SNIFFER;
/* Disable auto bus release */
val &= ~CDNS_MCP_CONFIG_BUS_REL;
if (cdns->bus.multi_link)
/* Set Multi-master mode to take gsync into account */
val |= CDNS_MCP_CONFIG_MMASTER;
/* leave frame delay to hardware default of 0x1F */
/* leave command retry to hardware default of 0 */
cdns_writel(cdns, CDNS_MCP_CONFIG, val);
/* changes will be committed later */
return 0;
}
EXPORT_SYMBOL(sdw_cdns_init);
int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
{
struct sdw_master_prop *prop = &bus->prop;
struct sdw_cdns *cdns = bus_to_cdns(bus);
int mcp_clkctrl_off;
int divider;
if (!params->curr_dr_freq) {
dev_err(cdns->dev, "NULL curr_dr_freq\n");
return -EINVAL;
}
divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
params->curr_dr_freq;
divider--; /* divider is 1/(N+1) */
if (params->next_bank)
mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
else
mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
return 0;
}
EXPORT_SYMBOL(cdns_bus_conf);
static int cdns_port_params(struct sdw_bus *bus,
struct sdw_port_params *p_params, unsigned int bank)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
int dpn_config_off_source;
int dpn_config_off_target;
int target_num = p_params->num;
int source_num = p_params->num;
bool override = false;
int dpn_config;
if (target_num == cdns->pdi_loopback_target &&
cdns->pdi_loopback_source != -1) {
source_num = cdns->pdi_loopback_source;
override = true;
}
if (bank) {
dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
} else {
dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
}
dpn_config = cdns_readl(cdns, dpn_config_off_source);
/* use port params if there is no loopback, otherwise use source as is */
if (!override) {
u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
}
cdns_writel(cdns, dpn_config_off_target, dpn_config);
return 0;
}
static int cdns_transport_params(struct sdw_bus *bus,
struct sdw_transport_params *t_params,
enum sdw_reg_bank bank)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
int dpn_config;
int dpn_config_off_source;
int dpn_config_off_target;
int dpn_hctrl;
int dpn_hctrl_off_source;
int dpn_hctrl_off_target;
int dpn_offsetctrl;
int dpn_offsetctrl_off_source;
int dpn_offsetctrl_off_target;
int dpn_samplectrl;
int dpn_samplectrl_off_source;
int dpn_samplectrl_off_target;
int source_num = t_params->port_num;
int target_num = t_params->port_num;
bool override = false;
if (target_num == cdns->pdi_loopback_target &&
cdns->pdi_loopback_source != -1) {
source_num = cdns->pdi_loopback_source;
override = true;
}
/*
* Note: Only full data port is supported on the Master side for
* both PCM and PDM ports.
*/
if (bank) {
dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
} else {
dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
}
dpn_config = cdns_readl(cdns, dpn_config_off_source);
if (!override) {
u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
}
cdns_writel(cdns, dpn_config_off_target, dpn_config);
if (!override) {
dpn_offsetctrl = 0;
u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
} else {
dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
}
cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl);
if (!override) {
dpn_hctrl = 0;
u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
} else {
dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
}
cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
if (!override)
dpn_samplectrl = t_params->sample_interval - 1;
else
dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
return 0;
}
static int cdns_port_enable(struct sdw_bus *bus,
struct sdw_enable_ch *enable_ch, unsigned int bank)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
int dpn_chnen_off, ch_mask;
if (bank)
dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
else
dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
ch_mask = enable_ch->ch_mask * enable_ch->enable;
cdns_writel(cdns, dpn_chnen_off, ch_mask);
return 0;
}
static const struct sdw_master_port_ops cdns_port_ops = {
.dpn_set_port_params = cdns_port_params,
.dpn_set_port_transport_params = cdns_transport_params,
.dpn_port_enable_ch = cdns_port_enable,
};
/**
* sdw_cdns_is_clock_stop: Check clock status
*
* @cdns: Cadence instance
*/
bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
{
return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
}
EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
/**
* sdw_cdns_clock_stop: Cadence clock stop configuration routine
*
* @cdns: Cadence instance
* @block_wake: prevent wakes if required by the platform
*/
int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
{
bool slave_present = false;
struct sdw_slave *slave;
int ret;
sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
/* Check suspend status */
if (sdw_cdns_is_clock_stop(cdns)) {
dev_dbg(cdns->dev, "Clock is already stopped\n");
return 0;
}
/*
* Before entering clock stop we mask the Slave
* interrupts. This helps avoid having to deal with e.g. a
* Slave becoming UNATTACHED while the clock is being stopped
*/
cdns_enable_slave_interrupts(cdns, false);
/*
* For specific platforms, it is required to be able to put
* master into a state in which it ignores wake-up trials
* in clock stop state
*/
if (block_wake)
cdns_updatel(cdns, CDNS_MCP_CONTROL,
CDNS_MCP_CONTROL_BLOCK_WAKEUP,
CDNS_MCP_CONTROL_BLOCK_WAKEUP);
list_for_each_entry(slave, &cdns->bus.slaves, node) {
if (slave->status == SDW_SLAVE_ATTACHED ||
slave->status == SDW_SLAVE_ALERT) {
slave_present = true;
break;
}
}
/* commit changes */
ret = cdns_config_update(cdns);
if (ret < 0) {
dev_err(cdns->dev, "%s: config_update failed\n", __func__);
return ret;
}
/* Prepare slaves for clock stop */
if (slave_present) {
ret = sdw_bus_prep_clk_stop(&cdns->bus);
if (ret < 0 && ret != -ENODATA) {
dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
return ret;
}
}
/*
* Enter clock stop mode and only report errors if there are
* Slave devices present (ALERT or ATTACHED)
*/
ret = sdw_bus_clk_stop(&cdns->bus);
if (ret < 0 && slave_present && ret != -ENODATA) {
dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
return ret;
}
ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
CDNS_MCP_STAT_CLK_STOP,
CDNS_MCP_STAT_CLK_STOP);
if (ret < 0)
dev_err(cdns->dev, "Clock stop failed %d\n", ret);
return ret;
}
EXPORT_SYMBOL(sdw_cdns_clock_stop);
/**
* sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
*
* @cdns: Cadence instance
* @bus_reset: context may be lost while in low power modes and the bus
* may require a Severe Reset and re-enumeration after a wake.
*/
int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
{
int ret;
/* unmask Slave interrupts that were masked when stopping the clock */
cdns_enable_slave_interrupts(cdns, true);
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;
}
ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
if (ret < 0) {
dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
return ret;
}
cdns_updatel(cdns, CDNS_MCP_CONTROL,
CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
CDNS_MCP_CONTROL_CMD_ACCEPT);
if (!bus_reset) {
/* enable bus operations with clock and data */
cdns_updatel(cdns, CDNS_MCP_CONFIG,
CDNS_MCP_CONFIG_OP,
CDNS_MCP_CONFIG_OP_NORMAL);
ret = cdns_config_update(cdns);
if (ret < 0) {
dev_err(cdns->dev, "%s: config_update failed\n", __func__);
return ret;
}
ret = sdw_bus_exit_clk_stop(&cdns->bus);
if (ret < 0)
dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
}
return ret;
}
EXPORT_SYMBOL(sdw_cdns_clock_restart);
/**
* sdw_cdns_probe() - Cadence probe routine
* @cdns: Cadence instance
*/
int sdw_cdns_probe(struct sdw_cdns *cdns)
{
init_completion(&cdns->tx_complete);
cdns->bus.port_ops = &cdns_port_ops;
INIT_WORK(&cdns->work, cdns_update_slave_status_work);
return 0;
}
EXPORT_SYMBOL(sdw_cdns_probe);
int cdns_set_sdw_stream(struct snd_soc_dai *dai,
void *stream, int direction)
{
struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
struct sdw_cdns_dai_runtime *dai_runtime;
if (stream) {
/* first paranoia check */
if (direction == SNDRV_PCM_STREAM_PLAYBACK)
dai_runtime = dai->playback_dma_data;
else
dai_runtime = dai->capture_dma_data;
if (dai_runtime) {
dev_err(dai->dev,
"dai_runtime already allocated for dai %s\n",
dai->name);
return -EINVAL;
}
/* allocate and set dai_runtime info */
dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL);
if (!dai_runtime)
return -ENOMEM;
dai_runtime->stream_type = SDW_STREAM_PCM;
dai_runtime->bus = &cdns->bus;
dai_runtime->link_id = cdns->instance;
dai_runtime->stream = stream;
if (direction == SNDRV_PCM_STREAM_PLAYBACK)
dai->playback_dma_data = dai_runtime;
else
dai->capture_dma_data = dai_runtime;
} else {
/* for NULL stream we release allocated dai_runtime */
if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
kfree(dai->playback_dma_data);
dai->playback_dma_data = NULL;
} else {
kfree(dai->capture_dma_data);
dai->capture_dma_data = NULL;
}
}
return 0;
}
EXPORT_SYMBOL(cdns_set_sdw_stream);
/**
* cdns_find_pdi() - Find a free PDI
*
* @cdns: Cadence instance
* @offset: Starting offset
* @num: Number of PDIs
* @pdi: PDI instances
* @dai_id: DAI id
*
* Find a PDI for a given PDI array. The PDI num and dai_id are
* expected to match, return NULL otherwise.
*/
static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
unsigned int offset,
unsigned int num,
struct sdw_cdns_pdi *pdi,
int dai_id)
{
int i;
for (i = offset; i < offset + num; i++)
if (pdi[i].num == dai_id)
return &pdi[i];
return NULL;
}
/**
* sdw_cdns_config_stream: Configure a stream
*
* @cdns: Cadence instance
* @ch: Channel count
* @dir: Data direction
* @pdi: PDI to be used
*/
void sdw_cdns_config_stream(struct sdw_cdns *cdns,
u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
{
u32 offset, val = 0;
if (dir == SDW_DATA_DIR_RX) {
val = CDNS_PORTCTRL_DIRN;
if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
val |= CDNS_PORTCTRL_TEST_FAILED;
}
offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
cdns_updatel(cdns, offset,
CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
val);
val = pdi->num;
val |= CDNS_PDI_CONFIG_SOFT_RESET;
val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
}
EXPORT_SYMBOL(sdw_cdns_config_stream);
/**
* sdw_cdns_alloc_pdi() - Allocate a PDI
*
* @cdns: Cadence instance
* @stream: Stream to be allocated
* @ch: Channel count
* @dir: Data direction
* @dai_id: DAI id
*/
struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
struct sdw_cdns_streams *stream,
u32 ch, u32 dir, int dai_id)
{
struct sdw_cdns_pdi *pdi = NULL;
if (dir == SDW_DATA_DIR_RX)
pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
dai_id);
else
pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
dai_id);
/* check if we found a PDI, else find in bi-directional */
if (!pdi)
pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
dai_id);
if (pdi) {
pdi->l_ch_num = 0;
pdi->h_ch_num = ch - 1;
pdi->dir = dir;
pdi->ch_count = ch;
}
return pdi;
}
EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Cadence Soundwire Library");