diff options
Diffstat (limited to 'drivers/soundwire/cadence_master.c')
| -rw-r--r-- | drivers/soundwire/cadence_master.c | 1898 |
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 000000000..0efc1c3be --- /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"); |