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linux-next/drivers/soundwire/cadence_master.c
Vinod Koul 2f52a5177c soundwire: cdns: Add cadence library
Cadence IP implements SoundWire Master. Add base cadence library
initialization and interrupt handling

Signed-off-by: Hardik T Shah <hardik.t.shah@intel.com>
Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-19 11:31:00 +01:00

432 lines
11 KiB
C

// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.
/*
* Cadence SoundWire Master module
* Used by Master driver
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw.h>
#include "bus.h"
#include "cadence_master.h"
#define CDNS_MCP_CONFIG 0x0
#define CDNS_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24)
#define CDNS_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16)
#define CDNS_MCP_CONFIG_MMASTER BIT(7)
#define CDNS_MCP_CONFIG_BUS_REL BIT(6)
#define CDNS_MCP_CONFIG_SNIFFER BIT(5)
#define CDNS_MCP_CONFIG_SSPMOD BIT(4)
#define CDNS_MCP_CONFIG_CMD BIT(3)
#define CDNS_MCP_CONFIG_OP GENMASK(2, 0)
#define CDNS_MCP_CONFIG_OP_NORMAL 0
#define CDNS_MCP_CONTROL 0x4
#define CDNS_MCP_CONTROL_RST_DELAY GENMASK(10, 8)
#define CDNS_MCP_CONTROL_CMD_RST BIT(7)
#define CDNS_MCP_CONTROL_SOFT_RST BIT(6)
#define CDNS_MCP_CONTROL_SW_RST BIT(5)
#define CDNS_MCP_CONTROL_HW_RST BIT(4)
#define CDNS_MCP_CONTROL_CLK_PAUSE BIT(3)
#define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2)
#define CDNS_MCP_CONTROL_CMD_ACCEPT BIT(1)
#define CDNS_MCP_CONTROL_BLOCK_WAKEUP BIT(0)
#define CDNS_MCP_CMDCTRL 0x8
#define CDNS_MCP_SSPSTAT 0xC
#define CDNS_MCP_FRAME_SHAPE 0x10
#define CDNS_MCP_FRAME_SHAPE_INIT 0x14
#define CDNS_MCP_CONFIG_UPDATE 0x18
#define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0)
#define CDNS_MCP_PHYCTRL 0x1C
#define CDNS_MCP_SSP_CTRL0 0x20
#define CDNS_MCP_SSP_CTRL1 0x28
#define CDNS_MCP_CLK_CTRL0 0x30
#define CDNS_MCP_CLK_CTRL1 0x38
#define CDNS_MCP_STAT 0x40
#define CDNS_MCP_STAT_ACTIVE_BANK BIT(20)
#define CDNS_MCP_STAT_CLK_STOP BIT(16)
#define CDNS_MCP_INTSTAT 0x44
#define CDNS_MCP_INTMASK 0x48
#define CDNS_MCP_INT_IRQ BIT(31)
#define CDNS_MCP_INT_WAKEUP BIT(16)
#define CDNS_MCP_INT_SLAVE_RSVD BIT(15)
#define CDNS_MCP_INT_SLAVE_ALERT BIT(14)
#define CDNS_MCP_INT_SLAVE_ATTACH BIT(13)
#define CDNS_MCP_INT_SLAVE_NATTACH BIT(12)
#define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12)
#define CDNS_MCP_INT_DPINT BIT(11)
#define CDNS_MCP_INT_CTRL_CLASH BIT(10)
#define CDNS_MCP_INT_DATA_CLASH BIT(9)
#define CDNS_MCP_INT_CMD_ERR BIT(7)
#define CDNS_MCP_INT_RX_WL BIT(2)
#define CDNS_MCP_INT_TXE BIT(1)
#define CDNS_MCP_INTSET 0x4C
#define CDNS_SDW_SLAVE_STAT 0x50
#define CDNS_MCP_SLAVE_STAT_MASK BIT(1, 0)
#define CDNS_MCP_SLAVE_INTSTAT0 0x54
#define CDNS_MCP_SLAVE_INTSTAT1 0x58
#define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0)
#define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1)
#define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2)
#define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3)
#define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0)
#define CDNS_MCP_SLAVE_STATUS_NUM 4
#define CDNS_MCP_SLAVE_INTMASK0 0x5C
#define CDNS_MCP_SLAVE_INTMASK1 0x60
#define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(30, 0)
#define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(16, 0)
#define CDNS_MCP_PORT_INTSTAT 0x64
#define CDNS_MCP_PDI_STAT 0x6C
#define CDNS_MCP_FIFOLEVEL 0x78
#define CDNS_MCP_FIFOSTAT 0x7C
#define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0)
#define CDNS_MCP_CMD_BASE 0x80
#define CDNS_MCP_RESP_BASE 0x80
#define CDNS_MCP_CMD_LEN 0x20
#define CDNS_MCP_CMD_WORD_LEN 0x4
#define CDNS_MCP_CMD_SSP_TAG BIT(31)
#define CDNS_MCP_CMD_COMMAND GENMASK(30, 28)
#define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24)
#define CDNS_MCP_CMD_REG_ADDR_H GENMASK(23, 16)
#define CDNS_MCP_CMD_REG_ADDR_L GENMASK(15, 8)
#define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0)
#define CDNS_MCP_CMD_READ 2
#define CDNS_MCP_CMD_WRITE 3
#define CDNS_MCP_RESP_RDATA GENMASK(15, 8)
#define CDNS_MCP_RESP_ACK BIT(0)
#define CDNS_MCP_RESP_NACK BIT(1)
#define CDNS_DP_SIZE 128
#define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_CONFIG_BPM BIT(18)
#define CDNS_DPN_CONFIG_BGC GENMASK(17, 16)
#define CDNS_DPN_CONFIG_WL GENMASK(12, 8)
#define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2)
#define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0)
#define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0)
#define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0)
#define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8)
#define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0)
#define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4)
#define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8)
#define CDNS_PORTCTRL 0x130
#define CDNS_PORTCTRL_DIRN BIT(7)
#define CDNS_PORTCTRL_BANK_INVERT BIT(8)
#define CDNS_PORT_OFFSET 0x80
#define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16)
#define CDNS_PDI_CONFIG_SOFT_RESET BIT(24)
#define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8)
#define CDNS_PDI_CONFIG_PORT GENMASK(4, 0)
/* Driver defaults */
#define CDNS_DEFAULT_CLK_DIVIDER 0
#define CDNS_DEFAULT_FRAME_SHAPE 0x30
#define CDNS_DEFAULT_SSP_INTERVAL 0x18
#define CDNS_TX_TIMEOUT 2000
#define CDNS_PCM_PDI_OFFSET 0x2
#define CDNS_PDM_PDI_OFFSET 0x6
#define CDNS_SCP_RX_FIFOLEVEL 0x2
/*
* register accessor helpers
*/
static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
{
return readl(cdns->registers + offset);
}
static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
{
writel(value, cdns->registers + offset);
}
static inline void cdns_updatel(struct sdw_cdns *cdns,
int offset, u32 mask, u32 val)
{
u32 tmp;
tmp = cdns_readl(cdns, offset);
tmp = (tmp & ~mask) | val;
cdns_writel(cdns, offset, tmp);
}
static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
{
int timeout = 10;
u32 reg_read;
writel(value, cdns->registers + offset);
/* Wait for bit to be self cleared */
do {
reg_read = readl(cdns->registers + offset);
if ((reg_read & value) == 0)
return 0;
timeout--;
udelay(50);
} while (timeout != 0);
return -EAGAIN;
}
/*
* IRQ handling
*/
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_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
*/
/**
* 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);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Cadence Soundwire Library");