summaryrefslogtreecommitdiffstats
path: root/drivers/soundwire/cadence_master.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/soundwire/cadence_master.c')
-rw-r--r--drivers/soundwire/cadence_master.c1898
1 files changed, 1898 insertions, 0 deletions
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
new file mode 100644
index 0000000000..0efc1c3bee
--- /dev/null
+++ b/drivers/soundwire/cadence_master.c
@@ -0,0 +1,1898 @@
+// 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_BUS_REL BIT(6)
+
+#define CDNS_IP_MCP_CONFIG 0x0 /* IP offset added at run-time */
+
+#define CDNS_IP_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24)
+#define CDNS_IP_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16)
+#define CDNS_IP_MCP_CONFIG_MMASTER BIT(7)
+#define CDNS_IP_MCP_CONFIG_SNIFFER BIT(5)
+#define CDNS_IP_MCP_CONFIG_CMD BIT(3)
+#define CDNS_IP_MCP_CONFIG_OP GENMASK(2, 0)
+#define CDNS_IP_MCP_CONFIG_OP_NORMAL 0
+
+#define CDNS_MCP_CONTROL 0x4
+
+#define CDNS_MCP_CONTROL_CMD_RST BIT(7)
+#define CDNS_MCP_CONTROL_SOFT_RST BIT(6)
+#define CDNS_MCP_CONTROL_HW_RST BIT(4)
+#define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2)
+
+#define CDNS_IP_MCP_CONTROL 0x4 /* IP offset added at run-time */
+
+#define CDNS_IP_MCP_CONTROL_RST_DELAY GENMASK(10, 8)
+#define CDNS_IP_MCP_CONTROL_SW_RST BIT(5)
+#define CDNS_IP_MCP_CONTROL_CLK_PAUSE BIT(3)
+#define CDNS_IP_MCP_CONTROL_CMD_ACCEPT BIT(1)
+#define CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP BIT(0)
+
+#define CDNS_IP_MCP_CMDCTRL 0x8 /* IP offset added at run-time */
+
+#define CDNS_IP_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_IP_MCP_CMD_BASE 0x80 /* IP offset added at run-time */
+#define CDNS_IP_MCP_RESP_BASE 0x80 /* IP offset added at run-time */
+/* 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 u32 cdns_ip_readl(struct sdw_cdns *cdns, int offset)
+{
+ return cdns_readl(cdns, cdns->ip_offset + offset);
+}
+
+static inline void cdns_ip_writel(struct sdw_cdns *cdns, int offset, u32 value)
+{
+ return cdns_writel(cdns, cdns->ip_offset + offset, value);
+}
+
+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 inline void cdns_ip_updatel(struct sdw_cdns *cdns,
+ int offset, u32 mask, u32 val)
+{
+ cdns_updatel(cdns, cdns->ip_offset + offset, mask, val);
+}
+
+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;
+}
+
+/**
+ * sdw_cdns_config_update() - Update configurations
+ * @cdns: Cadence instance
+ */
+void sdw_cdns_config_update(struct sdw_cdns *cdns)
+{
+ /* commit changes */
+ cdns_writel(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
+}
+EXPORT_SYMBOL(sdw_cdns_config_update);
+
+/**
+ * sdw_cdns_config_update_set_wait() - wait until configuration update bit is self-cleared
+ * @cdns: Cadence instance
+ */
+int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns)
+{
+ /* the hardware recommendation is to wait at least 300us */
+ return cdns_set_wait(cdns, CDNS_MCP_CONFIG_UPDATE,
+ CDNS_MCP_CONFIG_UPDATE_BIT, 0);
+}
+EXPORT_SYMBOL(sdw_cdns_config_update_set_wait);
+
+/*
+ * 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_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,
+ CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,
+ CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR);
+
+ /* commit changes */
+ ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
+ if (ret < 0)
+ goto unlock;
+
+ /* 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_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,
+ CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,
+ 0);
+
+ /* commit changes */
+ ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
+ if (ret < 0)
+ goto unlock;
+
+ /* Userspace changed the hardware state behind the kernel's back */
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+
+unlock:
+ /* Continue bus operation with parity error injection disabled */
+ mutex_unlock(&bus->bus_lock);
+
+ /*
+ * 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_IP_MCP_CMD_BASE;
+
+ for (i = 0; i < num_resp; i++) {
+ cdns->response_buf[i] = cdns_ip_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_IP_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_ip_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_IP_MCP_CMD_BASE;
+ cdns_ip_writel(cdns, base, data[0]);
+ base += CDNS_MCP_CMD_WORD_LEN;
+ cdns_ip_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_cdns *cdns = bus_to_cdns(bus);
+ struct sdw_defer *defer = &bus->defer_msg;
+ struct sdw_msg *msg = defer->msg;
+ 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;
+
+ return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
+}
+EXPORT_SYMBOL(cdns_xfer_msg_defer);
+
+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) {
+ struct sdw_bus *bus = &cdns->bus;
+ struct sdw_defer *defer = &bus->defer_msg;
+
+ cdns_read_response(cdns);
+
+ if (defer && defer->msg) {
+ cdns_fill_msg_resp(cdns, defer->msg,
+ defer->length, 0);
+ complete(&defer->complete);
+ } 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 ip_mcp_control;
+ u32 mcp_control;
+ u32 mcp_config_update;
+ int i;
+
+ if (initial_delay)
+ usleep_range(1000, 1500);
+
+ ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL);
+
+ /* the following bits should be cleared immediately */
+ if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST)
+ dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string);
+
+ 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_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 */
+ return cdns_config_update(cdns);
+}
+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_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,
+ CDNS_IP_MCP_CONTROL_CMD_ACCEPT);
+
+ /* Configure mcp config */
+ val = cdns_readl(cdns, CDNS_MCP_CONFIG);
+
+ /* Disable auto bus release */
+ val &= ~CDNS_MCP_CONFIG_BUS_REL;
+
+ cdns_writel(cdns, CDNS_MCP_CONFIG, val);
+
+ /* Configure IP mcp config */
+ val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG);
+
+ /* enable bus operations with clock and data */
+ val &= ~CDNS_IP_MCP_CONFIG_OP;
+ val |= CDNS_IP_MCP_CONFIG_OP_NORMAL;
+
+ /* Set cmd mode for Tx and Rx cmds */
+ val &= ~CDNS_IP_MCP_CONFIG_CMD;
+
+ /* Disable sniffer mode */
+ val &= ~CDNS_IP_MCP_CONFIG_SNIFFER;
+
+ if (cdns->bus.multi_link)
+ /* Set Multi-master mode to take gsync into account */
+ val |= CDNS_IP_MCP_CONFIG_MMASTER;
+
+ /* leave frame delay to hardware default of 0x1F */
+
+ /* leave command retry to hardware default of 0 */
+
+ cdns_ip_writel(cdns, CDNS_IP_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_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,
+ CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP,
+ CDNS_IP_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_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,
+ CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0);
+
+ cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,
+ CDNS_IP_MCP_CONTROL_CMD_ACCEPT);
+
+ if (!bus_reset) {
+
+ /* enable bus operations with clock and data */
+ cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG,
+ CDNS_IP_MCP_CONFIG_OP,
+ CDNS_IP_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;
+
+ dai_runtime = cdns->dai_runtime_array[dai->id];
+
+ if (stream) {
+ /* first paranoia check */
+ 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;
+ dai_runtime->direction = direction;
+
+ cdns->dai_runtime_array[dai->id] = dai_runtime;
+ } else {
+ /* second paranoia check */
+ if (!dai_runtime) {
+ dev_err(dai->dev,
+ "dai_runtime not allocated for dai %s\n",
+ dai->name);
+ return -EINVAL;
+ }
+
+ /* for NULL stream we release allocated dai_runtime */
+ kfree(dai_runtime);
+ cdns->dai_runtime_array[dai->id] = 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");