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