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linux/drivers/media/platform/meson/ao-cec.c
Neil Armstrong 6479aa8882 media: platform: meson-ao-cec: make busy TX warning silent 
Switch to dev_dbg for the busy TX message to avoid having a flood of:
[  228.064570] meson-ao-cec c8100100.cec: meson_ao_cec_transmit: busy TX: aborting
[  230.368489] meson-ao-cec c8100100.cec: meson_ao_cec_transmit: busy TX: aborting
[  234.208655] meson-ao-cec c8100100.cec: meson_ao_cec_transmit: busy TX: aborting
[  236.512558] meson-ao-cec c8100100.cec: meson_ao_cec_transmit: busy TX: aborting

This message is only a debug hint and not an error.

Fixes: 7ec2c0f72c ("media: platform: Add Amlogic Meson AO CEC Controller driver")

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2018-07-24 17:52:20 -04:00

745 lines
18 KiB
C
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/*
* Driver for Amlogic Meson AO CEC Controller
*
* Copyright (C) 2015 Amlogic, Inc. All rights reserved
* Copyright (C) 2017 BayLibre, SAS
* Author: Neil Armstrong <narmstrong@baylibre.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/reset.h>
#include <media/cec.h>
#include <media/cec-notifier.h>
/* CEC Registers */
/*
* [2:1] cntl_clk
* - 0 = Disable clk (Power-off mode)
* - 1 = Enable gated clock (Normal mode)
* - 2 = Enable free-run clk (Debug mode)
*/
#define CEC_GEN_CNTL_REG 0x00
#define CEC_GEN_CNTL_RESET BIT(0)
#define CEC_GEN_CNTL_CLK_DISABLE 0
#define CEC_GEN_CNTL_CLK_ENABLE 1
#define CEC_GEN_CNTL_CLK_ENABLE_DBG 2
#define CEC_GEN_CNTL_CLK_CTRL_MASK GENMASK(2, 1)
/*
* [7:0] cec_reg_addr
* [15:8] cec_reg_wrdata
* [16] cec_reg_wr
* - 0 = Read
* - 1 = Write
* [23] bus free
* [31:24] cec_reg_rddata
*/
#define CEC_RW_REG 0x04
#define CEC_RW_ADDR GENMASK(7, 0)
#define CEC_RW_WR_DATA GENMASK(15, 8)
#define CEC_RW_WRITE_EN BIT(16)
#define CEC_RW_BUS_BUSY BIT(23)
#define CEC_RW_RD_DATA GENMASK(31, 24)
/*
* [1] tx intr
* [2] rx intr
*/
#define CEC_INTR_MASKN_REG 0x08
#define CEC_INTR_CLR_REG 0x0c
#define CEC_INTR_STAT_REG 0x10
#define CEC_INTR_TX BIT(1)
#define CEC_INTR_RX BIT(2)
/* CEC Commands */
#define CEC_TX_MSG_0_HEADER 0x00
#define CEC_TX_MSG_1_OPCODE 0x01
#define CEC_TX_MSG_2_OP1 0x02
#define CEC_TX_MSG_3_OP2 0x03
#define CEC_TX_MSG_4_OP3 0x04
#define CEC_TX_MSG_5_OP4 0x05
#define CEC_TX_MSG_6_OP5 0x06
#define CEC_TX_MSG_7_OP6 0x07
#define CEC_TX_MSG_8_OP7 0x08
#define CEC_TX_MSG_9_OP8 0x09
#define CEC_TX_MSG_A_OP9 0x0A
#define CEC_TX_MSG_B_OP10 0x0B
#define CEC_TX_MSG_C_OP11 0x0C
#define CEC_TX_MSG_D_OP12 0x0D
#define CEC_TX_MSG_E_OP13 0x0E
#define CEC_TX_MSG_F_OP14 0x0F
#define CEC_TX_MSG_LENGTH 0x10
#define CEC_TX_MSG_CMD 0x11
#define CEC_TX_WRITE_BUF 0x12
#define CEC_TX_CLEAR_BUF 0x13
#define CEC_RX_MSG_CMD 0x14
#define CEC_RX_CLEAR_BUF 0x15
#define CEC_LOGICAL_ADDR0 0x16
#define CEC_LOGICAL_ADDR1 0x17
#define CEC_LOGICAL_ADDR2 0x18
#define CEC_LOGICAL_ADDR3 0x19
#define CEC_LOGICAL_ADDR4 0x1A
#define CEC_CLOCK_DIV_H 0x1B
#define CEC_CLOCK_DIV_L 0x1C
#define CEC_QUIESCENT_25MS_BIT7_0 0x20
#define CEC_QUIESCENT_25MS_BIT11_8 0x21
#define CEC_STARTBITMINL2H_3MS5_BIT7_0 0x22
#define CEC_STARTBITMINL2H_3MS5_BIT8 0x23
#define CEC_STARTBITMAXL2H_3MS9_BIT7_0 0x24
#define CEC_STARTBITMAXL2H_3MS9_BIT8 0x25
#define CEC_STARTBITMINH_0MS6_BIT7_0 0x26
#define CEC_STARTBITMINH_0MS6_BIT8 0x27
#define CEC_STARTBITMAXH_1MS0_BIT7_0 0x28
#define CEC_STARTBITMAXH_1MS0_BIT8 0x29
#define CEC_STARTBITMINTOT_4MS3_BIT7_0 0x2A
#define CEC_STARTBITMINTOT_4MS3_BIT9_8 0x2B
#define CEC_STARTBITMAXTOT_4MS7_BIT7_0 0x2C
#define CEC_STARTBITMAXTOT_4MS7_BIT9_8 0x2D
#define CEC_LOGIC1MINL2H_0MS4_BIT7_0 0x2E
#define CEC_LOGIC1MINL2H_0MS4_BIT8 0x2F
#define CEC_LOGIC1MAXL2H_0MS8_BIT7_0 0x30
#define CEC_LOGIC1MAXL2H_0MS8_BIT8 0x31
#define CEC_LOGIC0MINL2H_1MS3_BIT7_0 0x32
#define CEC_LOGIC0MINL2H_1MS3_BIT8 0x33
#define CEC_LOGIC0MAXL2H_1MS7_BIT7_0 0x34
#define CEC_LOGIC0MAXL2H_1MS7_BIT8 0x35
#define CEC_LOGICMINTOTAL_2MS05_BIT7_0 0x36
#define CEC_LOGICMINTOTAL_2MS05_BIT9_8 0x37
#define CEC_LOGICMAXHIGH_2MS8_BIT7_0 0x38
#define CEC_LOGICMAXHIGH_2MS8_BIT8 0x39
#define CEC_LOGICERRLOW_3MS4_BIT7_0 0x3A
#define CEC_LOGICERRLOW_3MS4_BIT8 0x3B
#define CEC_NOMSMPPOINT_1MS05 0x3C
#define CEC_DELCNTR_LOGICERR 0x3E
#define CEC_TXTIME_17MS_BIT7_0 0x40
#define CEC_TXTIME_17MS_BIT10_8 0x41
#define CEC_TXTIME_2BIT_BIT7_0 0x42
#define CEC_TXTIME_2BIT_BIT10_8 0x43
#define CEC_TXTIME_4BIT_BIT7_0 0x44
#define CEC_TXTIME_4BIT_BIT10_8 0x45
#define CEC_STARTBITNOML2H_3MS7_BIT7_0 0x46
#define CEC_STARTBITNOML2H_3MS7_BIT8 0x47
#define CEC_STARTBITNOMH_0MS8_BIT7_0 0x48
#define CEC_STARTBITNOMH_0MS8_BIT8 0x49
#define CEC_LOGIC1NOML2H_0MS6_BIT7_0 0x4A
#define CEC_LOGIC1NOML2H_0MS6_BIT8 0x4B
#define CEC_LOGIC0NOML2H_1MS5_BIT7_0 0x4C
#define CEC_LOGIC0NOML2H_1MS5_BIT8 0x4D
#define CEC_LOGIC1NOMH_1MS8_BIT7_0 0x4E
#define CEC_LOGIC1NOMH_1MS8_BIT8 0x4F
#define CEC_LOGIC0NOMH_0MS9_BIT7_0 0x50
#define CEC_LOGIC0NOMH_0MS9_BIT8 0x51
#define CEC_LOGICERRLOW_3MS6_BIT7_0 0x52
#define CEC_LOGICERRLOW_3MS6_BIT8 0x53
#define CEC_CHKCONTENTION_0MS1 0x54
#define CEC_PREPARENXTBIT_0MS05_BIT7_0 0x56
#define CEC_PREPARENXTBIT_0MS05_BIT8 0x57
#define CEC_NOMSMPACKPOINT_0MS45 0x58
#define CEC_ACK0NOML2H_1MS5_BIT7_0 0x5A
#define CEC_ACK0NOML2H_1MS5_BIT8 0x5B
#define CEC_BUGFIX_DISABLE_0 0x60
#define CEC_BUGFIX_DISABLE_1 0x61
#define CEC_RX_MSG_0_HEADER 0x80
#define CEC_RX_MSG_1_OPCODE 0x81
#define CEC_RX_MSG_2_OP1 0x82
#define CEC_RX_MSG_3_OP2 0x83
#define CEC_RX_MSG_4_OP3 0x84
#define CEC_RX_MSG_5_OP4 0x85
#define CEC_RX_MSG_6_OP5 0x86
#define CEC_RX_MSG_7_OP6 0x87
#define CEC_RX_MSG_8_OP7 0x88
#define CEC_RX_MSG_9_OP8 0x89
#define CEC_RX_MSG_A_OP9 0x8A
#define CEC_RX_MSG_B_OP10 0x8B
#define CEC_RX_MSG_C_OP11 0x8C
#define CEC_RX_MSG_D_OP12 0x8D
#define CEC_RX_MSG_E_OP13 0x8E
#define CEC_RX_MSG_F_OP14 0x8F
#define CEC_RX_MSG_LENGTH 0x90
#define CEC_RX_MSG_STATUS 0x91
#define CEC_RX_NUM_MSG 0x92
#define CEC_TX_MSG_STATUS 0x93
#define CEC_TX_NUM_MSG 0x94
/* CEC_TX_MSG_CMD definition */
#define TX_NO_OP 0 /* No transaction */
#define TX_REQ_CURRENT 1 /* Transmit earliest message in buffer */
#define TX_ABORT 2 /* Abort transmitting earliest message */
#define TX_REQ_NEXT 3 /* Overwrite earliest msg, transmit next */
/* tx_msg_status definition */
#define TX_IDLE 0 /* No transaction */
#define TX_BUSY 1 /* Transmitter is busy */
#define TX_DONE 2 /* Message successfully transmitted */
#define TX_ERROR 3 /* Message transmitted with error */
/* rx_msg_cmd */
#define RX_NO_OP 0 /* No transaction */
#define RX_ACK_CURRENT 1 /* Read earliest message in buffer */
#define RX_DISABLE 2 /* Disable receiving latest message */
#define RX_ACK_NEXT 3 /* Clear earliest msg, read next */
/* rx_msg_status */
#define RX_IDLE 0 /* No transaction */
#define RX_BUSY 1 /* Receiver is busy */
#define RX_DONE 2 /* Message has been received successfully */
#define RX_ERROR 3 /* Message has been received with error */
/* RX_CLEAR_BUF options */
#define CLEAR_START 1
#define CLEAR_STOP 0
/* CEC_LOGICAL_ADDRx options */
#define LOGICAL_ADDR_MASK 0xf
#define LOGICAL_ADDR_VALID BIT(4)
#define LOGICAL_ADDR_DISABLE 0
#define CEC_CLK_RATE 32768
struct meson_ao_cec_device {
struct platform_device *pdev;
void __iomem *base;
struct clk *core;
spinlock_t cec_reg_lock;
struct cec_notifier *notify;
struct cec_adapter *adap;
struct cec_msg rx_msg;
};
#define writel_bits_relaxed(mask, val, addr) \
writel_relaxed((readl_relaxed(addr) & ~(mask)) | (val), addr)
static inline int meson_ao_cec_wait_busy(struct meson_ao_cec_device *ao_cec)
{
ktime_t timeout = ktime_add_us(ktime_get(), 5000);
while (readl_relaxed(ao_cec->base + CEC_RW_REG) & CEC_RW_BUS_BUSY) {
if (ktime_compare(ktime_get(), timeout) > 0)
return -ETIMEDOUT;
}
return 0;
}
static void meson_ao_cec_read(struct meson_ao_cec_device *ao_cec,
unsigned long address, u8 *data,
int *res)
{
unsigned long flags;
u32 reg = FIELD_PREP(CEC_RW_ADDR, address);
int ret = 0;
if (res && *res)
return;
spin_lock_irqsave(&ao_cec->cec_reg_lock, flags);
ret = meson_ao_cec_wait_busy(ao_cec);
if (ret)
goto read_out;
writel_relaxed(reg, ao_cec->base + CEC_RW_REG);
ret = meson_ao_cec_wait_busy(ao_cec);
if (ret)
goto read_out;
*data = FIELD_GET(CEC_RW_RD_DATA,
readl_relaxed(ao_cec->base + CEC_RW_REG));
read_out:
spin_unlock_irqrestore(&ao_cec->cec_reg_lock, flags);
if (res)
*res = ret;
}
static void meson_ao_cec_write(struct meson_ao_cec_device *ao_cec,
unsigned long address, u8 data,
int *res)
{
unsigned long flags;
u32 reg = FIELD_PREP(CEC_RW_ADDR, address) |
FIELD_PREP(CEC_RW_WR_DATA, data) |
CEC_RW_WRITE_EN;
int ret = 0;
if (res && *res)
return;
spin_lock_irqsave(&ao_cec->cec_reg_lock, flags);
ret = meson_ao_cec_wait_busy(ao_cec);
if (ret)
goto write_out;
writel_relaxed(reg, ao_cec->base + CEC_RW_REG);
write_out:
spin_unlock_irqrestore(&ao_cec->cec_reg_lock, flags);
if (res)
*res = ret;
}
static inline void meson_ao_cec_irq_setup(struct meson_ao_cec_device *ao_cec,
bool enable)
{
u32 cfg = CEC_INTR_TX | CEC_INTR_RX;
writel_bits_relaxed(cfg, enable ? cfg : 0,
ao_cec->base + CEC_INTR_MASKN_REG);
}
static inline int meson_ao_cec_clear(struct meson_ao_cec_device *ao_cec)
{
int ret = 0;
meson_ao_cec_write(ao_cec, CEC_RX_MSG_CMD, RX_DISABLE, &ret);
meson_ao_cec_write(ao_cec, CEC_TX_MSG_CMD, TX_ABORT, &ret);
meson_ao_cec_write(ao_cec, CEC_RX_CLEAR_BUF, 1, &ret);
meson_ao_cec_write(ao_cec, CEC_TX_CLEAR_BUF, 1, &ret);
if (ret)
return ret;
udelay(100);
meson_ao_cec_write(ao_cec, CEC_RX_CLEAR_BUF, 0, &ret);
meson_ao_cec_write(ao_cec, CEC_TX_CLEAR_BUF, 0, &ret);
if (ret)
return ret;
udelay(100);
meson_ao_cec_write(ao_cec, CEC_RX_MSG_CMD, RX_NO_OP, &ret);
meson_ao_cec_write(ao_cec, CEC_TX_MSG_CMD, TX_NO_OP, &ret);
return ret;
}
static int meson_ao_cec_arbit_bit_time_set(struct meson_ao_cec_device *ao_cec,
unsigned int bit_set,
unsigned int time_set)
{
int ret = 0;
switch (bit_set) {
case CEC_SIGNAL_FREE_TIME_RETRY:
meson_ao_cec_write(ao_cec, CEC_TXTIME_4BIT_BIT7_0,
time_set & 0xff, &ret);
meson_ao_cec_write(ao_cec, CEC_TXTIME_4BIT_BIT10_8,
(time_set >> 8) & 0x7, &ret);
break;
case CEC_SIGNAL_FREE_TIME_NEW_INITIATOR:
meson_ao_cec_write(ao_cec, CEC_TXTIME_2BIT_BIT7_0,
time_set & 0xff, &ret);
meson_ao_cec_write(ao_cec, CEC_TXTIME_2BIT_BIT10_8,
(time_set >> 8) & 0x7, &ret);
break;
case CEC_SIGNAL_FREE_TIME_NEXT_XFER:
meson_ao_cec_write(ao_cec, CEC_TXTIME_17MS_BIT7_0,
time_set & 0xff, &ret);
meson_ao_cec_write(ao_cec, CEC_TXTIME_17MS_BIT10_8,
(time_set >> 8) & 0x7, &ret);
break;
}
return ret;
}
static irqreturn_t meson_ao_cec_irq(int irq, void *data)
{
struct meson_ao_cec_device *ao_cec = data;
u32 stat = readl_relaxed(ao_cec->base + CEC_INTR_STAT_REG);
if (stat)
return IRQ_WAKE_THREAD;
return IRQ_NONE;
}
static void meson_ao_cec_irq_tx(struct meson_ao_cec_device *ao_cec)
{
unsigned long tx_status = 0;
u8 stat;
int ret = 0;
meson_ao_cec_read(ao_cec, CEC_TX_MSG_STATUS, &stat, &ret);
if (ret)
goto tx_reg_err;
switch (stat) {
case TX_DONE:
tx_status = CEC_TX_STATUS_OK;
break;
case TX_BUSY:
tx_status = CEC_TX_STATUS_ARB_LOST;
break;
case TX_IDLE:
tx_status = CEC_TX_STATUS_LOW_DRIVE;
break;
case TX_ERROR:
default:
tx_status = CEC_TX_STATUS_NACK;
break;
}
/* Clear Interruption */
writel_relaxed(CEC_INTR_TX, ao_cec->base + CEC_INTR_CLR_REG);
/* Stop TX */
meson_ao_cec_write(ao_cec, CEC_TX_MSG_CMD, TX_NO_OP, &ret);
if (ret)
goto tx_reg_err;
cec_transmit_attempt_done(ao_cec->adap, tx_status);
return;
tx_reg_err:
cec_transmit_attempt_done(ao_cec->adap, CEC_TX_STATUS_ERROR);
}
static void meson_ao_cec_irq_rx(struct meson_ao_cec_device *ao_cec)
{
int i, ret = 0;
u8 reg;
meson_ao_cec_read(ao_cec, CEC_RX_MSG_STATUS, &reg, &ret);
if (reg != RX_DONE)
goto rx_out;
meson_ao_cec_read(ao_cec, CEC_RX_NUM_MSG, &reg, &ret);
if (reg != 1)
goto rx_out;
meson_ao_cec_read(ao_cec, CEC_RX_MSG_LENGTH, &reg, &ret);
ao_cec->rx_msg.len = reg + 1;
if (ao_cec->rx_msg.len > CEC_MAX_MSG_SIZE)
ao_cec->rx_msg.len = CEC_MAX_MSG_SIZE;
for (i = 0; i < ao_cec->rx_msg.len; i++) {
u8 byte;
meson_ao_cec_read(ao_cec, CEC_RX_MSG_0_HEADER + i, &byte, &ret);
ao_cec->rx_msg.msg[i] = byte;
}
if (ret)
goto rx_out;
cec_received_msg(ao_cec->adap, &ao_cec->rx_msg);
rx_out:
/* Clear Interruption */
writel_relaxed(CEC_INTR_RX, ao_cec->base + CEC_INTR_CLR_REG);
/* Ack RX message */
meson_ao_cec_write(ao_cec, CEC_RX_MSG_CMD, RX_ACK_CURRENT, &ret);
meson_ao_cec_write(ao_cec, CEC_RX_MSG_CMD, RX_NO_OP, &ret);
/* Clear RX buffer */
meson_ao_cec_write(ao_cec, CEC_RX_CLEAR_BUF, CLEAR_START, &ret);
meson_ao_cec_write(ao_cec, CEC_RX_CLEAR_BUF, CLEAR_STOP, &ret);
}
static irqreturn_t meson_ao_cec_irq_thread(int irq, void *data)
{
struct meson_ao_cec_device *ao_cec = data;
u32 stat = readl_relaxed(ao_cec->base + CEC_INTR_STAT_REG);
if (stat & CEC_INTR_TX)
meson_ao_cec_irq_tx(ao_cec);
meson_ao_cec_irq_rx(ao_cec);
return IRQ_HANDLED;
}
static int meson_ao_cec_set_log_addr(struct cec_adapter *adap, u8 logical_addr)
{
struct meson_ao_cec_device *ao_cec = adap->priv;
int ret = 0;
meson_ao_cec_write(ao_cec, CEC_LOGICAL_ADDR0,
LOGICAL_ADDR_DISABLE, &ret);
if (ret)
return ret;
ret = meson_ao_cec_clear(ao_cec);
if (ret)
return ret;
if (logical_addr == CEC_LOG_ADDR_INVALID)
return 0;
meson_ao_cec_write(ao_cec, CEC_LOGICAL_ADDR0,
logical_addr & LOGICAL_ADDR_MASK, &ret);
if (ret)
return ret;
udelay(100);
meson_ao_cec_write(ao_cec, CEC_LOGICAL_ADDR0,
(logical_addr & LOGICAL_ADDR_MASK) |
LOGICAL_ADDR_VALID, &ret);
return ret;
}
static int meson_ao_cec_transmit(struct cec_adapter *adap, u8 attempts,
u32 signal_free_time, struct cec_msg *msg)
{
struct meson_ao_cec_device *ao_cec = adap->priv;
int i, ret = 0;
u8 reg;
meson_ao_cec_read(ao_cec, CEC_TX_MSG_STATUS, &reg, &ret);
if (ret)
return ret;
if (reg == TX_BUSY) {
dev_dbg(&ao_cec->pdev->dev, "%s: busy TX: aborting\n",
__func__);
meson_ao_cec_write(ao_cec, CEC_TX_MSG_CMD, TX_ABORT, &ret);
}
for (i = 0; i < msg->len; i++) {
meson_ao_cec_write(ao_cec, CEC_TX_MSG_0_HEADER + i,
msg->msg[i], &ret);
}
meson_ao_cec_write(ao_cec, CEC_TX_MSG_LENGTH, msg->len - 1, &ret);
meson_ao_cec_write(ao_cec, CEC_TX_MSG_CMD, TX_REQ_CURRENT, &ret);
return ret;
}
static int meson_ao_cec_adap_enable(struct cec_adapter *adap, bool enable)
{
struct meson_ao_cec_device *ao_cec = adap->priv;
int ret;
meson_ao_cec_irq_setup(ao_cec, false);
writel_bits_relaxed(CEC_GEN_CNTL_RESET, CEC_GEN_CNTL_RESET,
ao_cec->base + CEC_GEN_CNTL_REG);
if (!enable)
return 0;
/* Enable gated clock (Normal mode). */
writel_bits_relaxed(CEC_GEN_CNTL_CLK_CTRL_MASK,
FIELD_PREP(CEC_GEN_CNTL_CLK_CTRL_MASK,
CEC_GEN_CNTL_CLK_ENABLE),
ao_cec->base + CEC_GEN_CNTL_REG);
udelay(100);
/* Release Reset */
writel_bits_relaxed(CEC_GEN_CNTL_RESET, 0,
ao_cec->base + CEC_GEN_CNTL_REG);
/* Clear buffers */
ret = meson_ao_cec_clear(ao_cec);
if (ret)
return ret;
/* CEC arbitration 3/5/7 bit time set. */
ret = meson_ao_cec_arbit_bit_time_set(ao_cec,
CEC_SIGNAL_FREE_TIME_RETRY,
0x118);
if (ret)
return ret;
ret = meson_ao_cec_arbit_bit_time_set(ao_cec,
CEC_SIGNAL_FREE_TIME_NEW_INITIATOR,
0x000);
if (ret)
return ret;
ret = meson_ao_cec_arbit_bit_time_set(ao_cec,
CEC_SIGNAL_FREE_TIME_NEXT_XFER,
0x2aa);
if (ret)
return ret;
meson_ao_cec_irq_setup(ao_cec, true);
return 0;
}
static const struct cec_adap_ops meson_ao_cec_ops = {
.adap_enable = meson_ao_cec_adap_enable,
.adap_log_addr = meson_ao_cec_set_log_addr,
.adap_transmit = meson_ao_cec_transmit,
};
static int meson_ao_cec_probe(struct platform_device *pdev)
{
struct meson_ao_cec_device *ao_cec;
struct platform_device *hdmi_dev;
struct device_node *np;
struct resource *res;
int ret, irq;
np = of_parse_phandle(pdev->dev.of_node, "hdmi-phandle", 0);
if (!np) {
dev_err(&pdev->dev, "Failed to find hdmi node\n");
return -ENODEV;
}
hdmi_dev = of_find_device_by_node(np);
if (hdmi_dev == NULL)
return -EPROBE_DEFER;
ao_cec = devm_kzalloc(&pdev->dev, sizeof(*ao_cec), GFP_KERNEL);
if (!ao_cec)
return -ENOMEM;
spin_lock_init(&ao_cec->cec_reg_lock);
ao_cec->notify = cec_notifier_get(&hdmi_dev->dev);
if (!ao_cec->notify)
return -ENOMEM;
ao_cec->adap = cec_allocate_adapter(&meson_ao_cec_ops, ao_cec,
"meson_ao_cec",
CEC_CAP_LOG_ADDRS |
CEC_CAP_TRANSMIT |
CEC_CAP_RC |
CEC_CAP_PASSTHROUGH,
1); /* Use 1 for now */
if (IS_ERR(ao_cec->adap)) {
ret = PTR_ERR(ao_cec->adap);
goto out_probe_notify;
}
ao_cec->adap->owner = THIS_MODULE;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ao_cec->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ao_cec->base)) {
ret = PTR_ERR(ao_cec->base);
goto out_probe_adapter;
}
irq = platform_get_irq(pdev, 0);
ret = devm_request_threaded_irq(&pdev->dev, irq,
meson_ao_cec_irq,
meson_ao_cec_irq_thread,
0, NULL, ao_cec);
if (ret) {
dev_err(&pdev->dev, "irq request failed\n");
goto out_probe_adapter;
}
ao_cec->core = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(ao_cec->core)) {
dev_err(&pdev->dev, "core clock request failed\n");
ret = PTR_ERR(ao_cec->core);
goto out_probe_adapter;
}
ret = clk_prepare_enable(ao_cec->core);
if (ret) {
dev_err(&pdev->dev, "core clock enable failed\n");
goto out_probe_adapter;
}
ret = clk_set_rate(ao_cec->core, CEC_CLK_RATE);
if (ret) {
dev_err(&pdev->dev, "core clock set rate failed\n");
goto out_probe_clk;
}
device_reset_optional(&pdev->dev);
ao_cec->pdev = pdev;
platform_set_drvdata(pdev, ao_cec);
ret = cec_register_adapter(ao_cec->adap, &pdev->dev);
if (ret < 0) {
cec_notifier_put(ao_cec->notify);
goto out_probe_clk;
}
/* Setup Hardware */
writel_relaxed(CEC_GEN_CNTL_RESET,
ao_cec->base + CEC_GEN_CNTL_REG);
cec_register_cec_notifier(ao_cec->adap, ao_cec->notify);
return 0;
out_probe_clk:
clk_disable_unprepare(ao_cec->core);
out_probe_adapter:
cec_delete_adapter(ao_cec->adap);
out_probe_notify:
cec_notifier_put(ao_cec->notify);
dev_err(&pdev->dev, "CEC controller registration failed\n");
return ret;
}
static int meson_ao_cec_remove(struct platform_device *pdev)
{
struct meson_ao_cec_device *ao_cec = platform_get_drvdata(pdev);
clk_disable_unprepare(ao_cec->core);
cec_unregister_adapter(ao_cec->adap);
cec_notifier_put(ao_cec->notify);
return 0;
}
static const struct of_device_id meson_ao_cec_of_match[] = {
{ .compatible = "amlogic,meson-gx-ao-cec", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, meson_ao_cec_of_match);
static struct platform_driver meson_ao_cec_driver = {
.probe = meson_ao_cec_probe,
.remove = meson_ao_cec_remove,
.driver = {
.name = "meson-ao-cec",
.of_match_table = of_match_ptr(meson_ao_cec_of_match),
},
};
module_platform_driver(meson_ao_cec_driver);
MODULE_DESCRIPTION("Meson AO CEC Controller driver");
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
MODULE_LICENSE("GPL");
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