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linux/drivers/i2c/busses/i2c-pxa.c
Paul Cercueil 1ea4e6b56e i2c: pxa: Remove #ifdef guards for PM related functions 
Use the new PM macros for the suspend and resume functions to be
automatically dropped by the compiler when CONFIG_PM or
CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.

This has the advantage of always compiling these functions in,
independently of any Kconfig option. Thanks to that, bugs and other
regressions are subsequently easier to catch.

Note that the behaviour is slightly different than before; the original
code wrapped the suspend/resume with #ifdef CONFIG_PM guards, which
resulted in these functions being compiled in but never used when
CONFIG_PM_SLEEP was disabled.

Now, those functions are only compiled in when CONFIG_PM_SLEEP is
enabled.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20230722115046.27323-17-paul@crapouillou.net
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
2023-08-08 15:36:50 +02:00

1543 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* i2c_adap_pxa.c
*
* I2C adapter for the PXA I2C bus access.
*
* Copyright (C) 2002 Intrinsyc Software Inc.
* Copyright (C) 2004-2005 Deep Blue Solutions Ltd.
*
* History:
* Apr 2002: Initial version [CS]
* Jun 2002: Properly separated algo/adap [FB]
* Jan 2003: Fixed several bugs concerning interrupt handling [Kai-Uwe Bloem]
* Jan 2003: added limited signal handling [Kai-Uwe Bloem]
* Sep 2004: Major rework to ensure efficient bus handling [RMK]
* Dec 2004: Added support for PXA27x and slave device probing [Liam Girdwood]
* Feb 2005: Rework slave mode handling [RMK]
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/platform_data/i2c-pxa.h>
#include <linux/slab.h>
/* I2C register field definitions */
#define IBMR_SDAS (1 << 0)
#define IBMR_SCLS (1 << 1)
#define ICR_START (1 << 0) /* start bit */
#define ICR_STOP (1 << 1) /* stop bit */
#define ICR_ACKNAK (1 << 2) /* send ACK(0) or NAK(1) */
#define ICR_TB (1 << 3) /* transfer byte bit */
#define ICR_MA (1 << 4) /* master abort */
#define ICR_SCLE (1 << 5) /* master clock enable */
#define ICR_IUE (1 << 6) /* unit enable */
#define ICR_GCD (1 << 7) /* general call disable */
#define ICR_ITEIE (1 << 8) /* enable tx interrupts */
#define ICR_IRFIE (1 << 9) /* enable rx interrupts */
#define ICR_BEIE (1 << 10) /* enable bus error ints */
#define ICR_SSDIE (1 << 11) /* slave STOP detected int enable */
#define ICR_ALDIE (1 << 12) /* enable arbitration interrupt */
#define ICR_SADIE (1 << 13) /* slave address detected int enable */
#define ICR_UR (1 << 14) /* unit reset */
#define ICR_FM (1 << 15) /* fast mode */
#define ICR_HS (1 << 16) /* High Speed mode */
#define ICR_A3700_FM (1 << 16) /* fast mode for armada-3700 */
#define ICR_A3700_HS (1 << 17) /* high speed mode for armada-3700 */
#define ICR_GPIOEN (1 << 19) /* enable GPIO mode for SCL in HS */
#define ISR_RWM (1 << 0) /* read/write mode */
#define ISR_ACKNAK (1 << 1) /* ack/nak status */
#define ISR_UB (1 << 2) /* unit busy */
#define ISR_IBB (1 << 3) /* bus busy */
#define ISR_SSD (1 << 4) /* slave stop detected */
#define ISR_ALD (1 << 5) /* arbitration loss detected */
#define ISR_ITE (1 << 6) /* tx buffer empty */
#define ISR_IRF (1 << 7) /* rx buffer full */
#define ISR_GCAD (1 << 8) /* general call address detected */
#define ISR_SAD (1 << 9) /* slave address detected */
#define ISR_BED (1 << 10) /* bus error no ACK/NAK */
#define ILCR_SLV_SHIFT 0
#define ILCR_SLV_MASK (0x1FF << ILCR_SLV_SHIFT)
#define ILCR_FLV_SHIFT 9
#define ILCR_FLV_MASK (0x1FF << ILCR_FLV_SHIFT)
#define ILCR_HLVL_SHIFT 18
#define ILCR_HLVL_MASK (0x1FF << ILCR_HLVL_SHIFT)
#define ILCR_HLVH_SHIFT 27
#define ILCR_HLVH_MASK (0x1F << ILCR_HLVH_SHIFT)
#define IWCR_CNT_SHIFT 0
#define IWCR_CNT_MASK (0x1F << IWCR_CNT_SHIFT)
#define IWCR_HS_CNT1_SHIFT 5
#define IWCR_HS_CNT1_MASK (0x1F << IWCR_HS_CNT1_SHIFT)
#define IWCR_HS_CNT2_SHIFT 10
#define IWCR_HS_CNT2_MASK (0x1F << IWCR_HS_CNT2_SHIFT)
/* need a longer timeout if we're dealing with the fact we may well be
* looking at a multi-master environment
*/
#define DEF_TIMEOUT 32
#define NO_SLAVE (-ENXIO)
#define BUS_ERROR (-EREMOTEIO)
#define XFER_NAKED (-ECONNREFUSED)
#define I2C_RETRY (-2000) /* an error has occurred retry transmit */
/* ICR initialize bit values
*
* 15 FM 0 (100 kHz operation)
* 14 UR 0 (No unit reset)
* 13 SADIE 0 (Disables the unit from interrupting on slave addresses
* matching its slave address)
* 12 ALDIE 0 (Disables the unit from interrupt when it loses arbitration
* in master mode)
* 11 SSDIE 0 (Disables interrupts from a slave stop detected, in slave mode)
* 10 BEIE 1 (Enable interrupts from detected bus errors, no ACK sent)
* 9 IRFIE 1 (Enable interrupts from full buffer received)
* 8 ITEIE 1 (Enables the I2C unit to interrupt when transmit buffer empty)
* 7 GCD 1 (Disables i2c unit response to general call messages as a slave)
* 6 IUE 0 (Disable unit until we change settings)
* 5 SCLE 1 (Enables the i2c clock output for master mode (drives SCL)
* 4 MA 0 (Only send stop with the ICR stop bit)
* 3 TB 0 (We are not transmitting a byte initially)
* 2 ACKNAK 0 (Send an ACK after the unit receives a byte)
* 1 STOP 0 (Do not send a STOP)
* 0 START 0 (Do not send a START)
*/
#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
/* I2C status register init values
*
* 10 BED 1 (Clear bus error detected)
* 9 SAD 1 (Clear slave address detected)
* 7 IRF 1 (Clear IDBR Receive Full)
* 6 ITE 1 (Clear IDBR Transmit Empty)
* 5 ALD 1 (Clear Arbitration Loss Detected)
* 4 SSD 1 (Clear Slave Stop Detected)
*/
#define I2C_ISR_INIT 0x7FF /* status register init */
struct pxa_reg_layout {
u32 ibmr;
u32 idbr;
u32 icr;
u32 isr;
u32 isar;
u32 ilcr;
u32 iwcr;
u32 fm;
u32 hs;
};
enum pxa_i2c_types {
REGS_PXA2XX,
REGS_PXA3XX,
REGS_CE4100,
REGS_PXA910,
REGS_A3700,
};
/* I2C register layout definitions */
static struct pxa_reg_layout pxa_reg_layout[] = {
[REGS_PXA2XX] = {
.ibmr = 0x00,
.idbr = 0x08,
.icr = 0x10,
.isr = 0x18,
.isar = 0x20,
.fm = ICR_FM,
.hs = ICR_HS,
},
[REGS_PXA3XX] = {
.ibmr = 0x00,
.idbr = 0x04,
.icr = 0x08,
.isr = 0x0c,
.isar = 0x10,
.fm = ICR_FM,
.hs = ICR_HS,
},
[REGS_CE4100] = {
.ibmr = 0x14,
.idbr = 0x0c,
.icr = 0x00,
.isr = 0x04,
/* no isar register */
.fm = ICR_FM,
.hs = ICR_HS,
},
[REGS_PXA910] = {
.ibmr = 0x00,
.idbr = 0x08,
.icr = 0x10,
.isr = 0x18,
.isar = 0x20,
.ilcr = 0x28,
.iwcr = 0x30,
.fm = ICR_FM,
.hs = ICR_HS,
},
[REGS_A3700] = {
.ibmr = 0x00,
.idbr = 0x04,
.icr = 0x08,
.isr = 0x0c,
.isar = 0x10,
.fm = ICR_A3700_FM,
.hs = ICR_A3700_HS,
},
};
static const struct of_device_id i2c_pxa_dt_ids[] = {
{ .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
{ .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
{ .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA910 },
{ .compatible = "marvell,armada-3700-i2c", .data = (void *)REGS_A3700 },
{}
};
MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);
static const struct platform_device_id i2c_pxa_id_table[] = {
{ "pxa2xx-i2c", REGS_PXA2XX },
{ "pxa3xx-pwri2c", REGS_PXA3XX },
{ "ce4100-i2c", REGS_CE4100 },
{ "pxa910-i2c", REGS_PXA910 },
{ "armada-3700-i2c", REGS_A3700 },
{ },
};
MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
struct pxa_i2c {
spinlock_t lock;
wait_queue_head_t wait;
struct i2c_msg *msg;
unsigned int msg_num;
unsigned int msg_idx;
unsigned int msg_ptr;
unsigned int slave_addr;
unsigned int req_slave_addr;
struct i2c_adapter adap;
struct clk *clk;
#ifdef CONFIG_I2C_PXA_SLAVE
struct i2c_client *slave;
#endif
unsigned int irqlogidx;
u32 isrlog[32];
u32 icrlog[32];
void __iomem *reg_base;
void __iomem *reg_ibmr;
void __iomem *reg_idbr;
void __iomem *reg_icr;
void __iomem *reg_isr;
void __iomem *reg_isar;
void __iomem *reg_ilcr;
void __iomem *reg_iwcr;
unsigned long iobase;
unsigned long iosize;
int irq;
unsigned int use_pio :1;
unsigned int fast_mode :1;
unsigned int high_mode:1;
unsigned char master_code;
unsigned long rate;
bool highmode_enter;
u32 fm_mask;
u32 hs_mask;
struct i2c_bus_recovery_info recovery;
};
#define _IBMR(i2c) ((i2c)->reg_ibmr)
#define _IDBR(i2c) ((i2c)->reg_idbr)
#define _ICR(i2c) ((i2c)->reg_icr)
#define _ISR(i2c) ((i2c)->reg_isr)
#define _ISAR(i2c) ((i2c)->reg_isar)
#define _ILCR(i2c) ((i2c)->reg_ilcr)
#define _IWCR(i2c) ((i2c)->reg_iwcr)
/*
* I2C Slave mode address
*/
#define I2C_PXA_SLAVE_ADDR 0x1
#ifdef DEBUG
struct bits {
u32 mask;
const char *set;
const char *unset;
};
#define PXA_BIT(m, s, u) { .mask = m, .set = s, .unset = u }
static inline void
decode_bits(const char *prefix, const struct bits *bits, int num, u32 val)
{
printk("%s %08x:", prefix, val);
while (num--) {
const char *str = val & bits->mask ? bits->set : bits->unset;
if (str)
pr_cont(" %s", str);
bits++;
}
pr_cont("\n");
}
static const struct bits isr_bits[] = {
PXA_BIT(ISR_RWM, "RX", "TX"),
PXA_BIT(ISR_ACKNAK, "NAK", "ACK"),
PXA_BIT(ISR_UB, "Bsy", "Rdy"),
PXA_BIT(ISR_IBB, "BusBsy", "BusRdy"),
PXA_BIT(ISR_SSD, "SlaveStop", NULL),
PXA_BIT(ISR_ALD, "ALD", NULL),
PXA_BIT(ISR_ITE, "TxEmpty", NULL),
PXA_BIT(ISR_IRF, "RxFull", NULL),
PXA_BIT(ISR_GCAD, "GenCall", NULL),
PXA_BIT(ISR_SAD, "SlaveAddr", NULL),
PXA_BIT(ISR_BED, "BusErr", NULL),
};
static void decode_ISR(unsigned int val)
{
decode_bits(KERN_DEBUG "ISR", isr_bits, ARRAY_SIZE(isr_bits), val);
}
static const struct bits icr_bits[] = {
PXA_BIT(ICR_START, "START", NULL),
PXA_BIT(ICR_STOP, "STOP", NULL),
PXA_BIT(ICR_ACKNAK, "ACKNAK", NULL),
PXA_BIT(ICR_TB, "TB", NULL),
PXA_BIT(ICR_MA, "MA", NULL),
PXA_BIT(ICR_SCLE, "SCLE", "scle"),
PXA_BIT(ICR_IUE, "IUE", "iue"),
PXA_BIT(ICR_GCD, "GCD", NULL),
PXA_BIT(ICR_ITEIE, "ITEIE", NULL),
PXA_BIT(ICR_IRFIE, "IRFIE", NULL),
PXA_BIT(ICR_BEIE, "BEIE", NULL),
PXA_BIT(ICR_SSDIE, "SSDIE", NULL),
PXA_BIT(ICR_ALDIE, "ALDIE", NULL),
PXA_BIT(ICR_SADIE, "SADIE", NULL),
PXA_BIT(ICR_UR, "UR", "ur"),
};
#ifdef CONFIG_I2C_PXA_SLAVE
static void decode_ICR(unsigned int val)
{
decode_bits(KERN_DEBUG "ICR", icr_bits, ARRAY_SIZE(icr_bits), val);
}
#endif
static unsigned int i2c_debug = DEBUG;
static void i2c_pxa_show_state(struct pxa_i2c *i2c, int lno, const char *fname)
{
dev_dbg(&i2c->adap.dev, "state:%s:%d: ISR=%08x, ICR=%08x, IBMR=%02x\n", fname, lno,
readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
}
#define show_state(i2c) i2c_pxa_show_state(i2c, __LINE__, __func__)
static void i2c_pxa_scream_blue_murder(struct pxa_i2c *i2c, const char *why)
{
unsigned int i;
struct device *dev = &i2c->adap.dev;
dev_err(dev, "slave_0x%x error: %s\n",
i2c->req_slave_addr >> 1, why);
dev_err(dev, "msg_num: %d msg_idx: %d msg_ptr: %d\n",
i2c->msg_num, i2c->msg_idx, i2c->msg_ptr);
dev_err(dev, "IBMR: %08x IDBR: %08x ICR: %08x ISR: %08x\n",
readl(_IBMR(i2c)), readl(_IDBR(i2c)), readl(_ICR(i2c)),
readl(_ISR(i2c)));
dev_err(dev, "log:");
for (i = 0; i < i2c->irqlogidx; i++)
pr_cont(" [%03x:%05x]", i2c->isrlog[i], i2c->icrlog[i]);
pr_cont("\n");
}
#else /* ifdef DEBUG */
#define i2c_debug 0
#define show_state(i2c) do { } while (0)
#define decode_ISR(val) do { } while (0)
#define decode_ICR(val) do { } while (0)
#define i2c_pxa_scream_blue_murder(i2c, why) do { } while (0)
#endif /* ifdef DEBUG / else */
static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret);
static inline int i2c_pxa_is_slavemode(struct pxa_i2c *i2c)
{
return !(readl(_ICR(i2c)) & ICR_SCLE);
}
static void i2c_pxa_abort(struct pxa_i2c *i2c)
{
int i = 250;
if (i2c_pxa_is_slavemode(i2c)) {
dev_dbg(&i2c->adap.dev, "%s: called in slave mode\n", __func__);
return;
}
while ((i > 0) && (readl(_IBMR(i2c)) & IBMR_SDAS) == 0) {
unsigned long icr = readl(_ICR(i2c));
icr &= ~ICR_START;
icr |= ICR_ACKNAK | ICR_STOP | ICR_TB;
writel(icr, _ICR(i2c));
show_state(i2c);
mdelay(1);
i --;
}
writel(readl(_ICR(i2c)) & ~(ICR_MA | ICR_START | ICR_STOP),
_ICR(i2c));
}
static int i2c_pxa_wait_bus_not_busy(struct pxa_i2c *i2c)
{
int timeout = DEF_TIMEOUT;
u32 isr;
while (1) {
isr = readl(_ISR(i2c));
if (!(isr & (ISR_IBB | ISR_UB)))
return 0;
if (isr & ISR_SAD)
timeout += 4;
if (!timeout--)
break;
msleep(2);
show_state(i2c);
}
show_state(i2c);
return I2C_RETRY;
}
static int i2c_pxa_wait_master(struct pxa_i2c *i2c)
{
unsigned long timeout = jiffies + HZ*4;
while (time_before(jiffies, timeout)) {
if (i2c_debug > 1)
dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
__func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
if (readl(_ISR(i2c)) & ISR_SAD) {
if (i2c_debug > 0)
dev_dbg(&i2c->adap.dev, "%s: Slave detected\n", __func__);
goto out;
}
/* wait for unit and bus being not busy, and we also do a
* quick check of the i2c lines themselves to ensure they've
* gone high...
*/
if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) == 0 &&
readl(_IBMR(i2c)) == (IBMR_SCLS | IBMR_SDAS)) {
if (i2c_debug > 0)
dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
return 1;
}
msleep(1);
}
if (i2c_debug > 0)
dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__);
out:
return 0;
}
static int i2c_pxa_set_master(struct pxa_i2c *i2c)
{
if (i2c_debug)
dev_dbg(&i2c->adap.dev, "setting to bus master\n");
if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) != 0) {
dev_dbg(&i2c->adap.dev, "%s: unit is busy\n", __func__);
if (!i2c_pxa_wait_master(i2c)) {
dev_dbg(&i2c->adap.dev, "%s: error: unit busy\n", __func__);
return I2C_RETRY;
}
}
writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
return 0;
}
#ifdef CONFIG_I2C_PXA_SLAVE
static int i2c_pxa_wait_slave(struct pxa_i2c *i2c)
{
unsigned long timeout = jiffies + HZ*1;
/* wait for stop */
show_state(i2c);
while (time_before(jiffies, timeout)) {
if (i2c_debug > 1)
dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
__func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
if ((readl(_ISR(i2c)) & (ISR_UB|ISR_IBB)) == 0 ||
(readl(_ISR(i2c)) & ISR_SAD) != 0 ||
(readl(_ICR(i2c)) & ICR_SCLE) == 0) {
if (i2c_debug > 1)
dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
return 1;
}
msleep(1);
}
if (i2c_debug > 0)
dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__);
return 0;
}
/*
* clear the hold on the bus, and take of anything else
* that has been configured
*/
static void i2c_pxa_set_slave(struct pxa_i2c *i2c, int errcode)
{
show_state(i2c);
if (errcode < 0) {
udelay(100); /* simple delay */
} else {
/* we need to wait for the stop condition to end */
/* if we where in stop, then clear... */
if (readl(_ICR(i2c)) & ICR_STOP) {
udelay(100);
writel(readl(_ICR(i2c)) & ~ICR_STOP, _ICR(i2c));
}
if (!i2c_pxa_wait_slave(i2c)) {
dev_err(&i2c->adap.dev, "%s: wait timedout\n",
__func__);
return;
}
}
writel(readl(_ICR(i2c)) & ~(ICR_STOP|ICR_ACKNAK|ICR_MA), _ICR(i2c));
writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
if (i2c_debug) {
dev_dbg(&i2c->adap.dev, "ICR now %08x, ISR %08x\n", readl(_ICR(i2c)), readl(_ISR(i2c)));
decode_ICR(readl(_ICR(i2c)));
}
}
#else
#define i2c_pxa_set_slave(i2c, err) do { } while (0)
#endif
static void i2c_pxa_do_reset(struct pxa_i2c *i2c)
{
/* reset according to 9.8 */
writel(ICR_UR, _ICR(i2c));
writel(I2C_ISR_INIT, _ISR(i2c));
writel(readl(_ICR(i2c)) & ~ICR_UR, _ICR(i2c));
if (i2c->reg_isar && IS_ENABLED(CONFIG_I2C_PXA_SLAVE))
writel(i2c->slave_addr, _ISAR(i2c));
/* set control register values */
writel(I2C_ICR_INIT | (i2c->fast_mode ? i2c->fm_mask : 0), _ICR(i2c));
writel(readl(_ICR(i2c)) | (i2c->high_mode ? i2c->hs_mask : 0), _ICR(i2c));
#ifdef CONFIG_I2C_PXA_SLAVE
dev_info(&i2c->adap.dev, "Enabling slave mode\n");
writel(readl(_ICR(i2c)) | ICR_SADIE | ICR_ALDIE | ICR_SSDIE, _ICR(i2c));
#endif
i2c_pxa_set_slave(i2c, 0);
}
static void i2c_pxa_enable(struct pxa_i2c *i2c)
{
/* enable unit */
writel(readl(_ICR(i2c)) | ICR_IUE, _ICR(i2c));
udelay(100);
}
static void i2c_pxa_reset(struct pxa_i2c *i2c)
{
pr_debug("Resetting I2C Controller Unit\n");
/* abort any transfer currently under way */
i2c_pxa_abort(i2c);
i2c_pxa_do_reset(i2c);
i2c_pxa_enable(i2c);
}
#ifdef CONFIG_I2C_PXA_SLAVE
/*
* PXA I2C Slave mode
*/
static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr)
{
if (isr & ISR_BED) {
/* what should we do here? */
} else {
u8 byte = 0;
if (i2c->slave != NULL)
i2c_slave_event(i2c->slave, I2C_SLAVE_READ_PROCESSED,
&byte);
writel(byte, _IDBR(i2c));
writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c)); /* allow next byte */
}
}
static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr)
{
u8 byte = readl(_IDBR(i2c));
if (i2c->slave != NULL)
i2c_slave_event(i2c->slave, I2C_SLAVE_WRITE_RECEIVED, &byte);
writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
}
static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr)
{
int timeout;
if (i2c_debug > 0)
dev_dbg(&i2c->adap.dev, "SAD, mode is slave-%cx\n",
(isr & ISR_RWM) ? 'r' : 't');
if (i2c->slave != NULL) {
if (isr & ISR_RWM) {
u8 byte = 0;
i2c_slave_event(i2c->slave, I2C_SLAVE_READ_REQUESTED,
&byte);
writel(byte, _IDBR(i2c));
} else {
i2c_slave_event(i2c->slave, I2C_SLAVE_WRITE_REQUESTED,
NULL);
}
}
/*
* slave could interrupt in the middle of us generating a
* start condition... if this happens, we'd better back off
* and stop holding the poor thing up
*/
writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c));
writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
timeout = 0x10000;
while (1) {
if ((readl(_IBMR(i2c)) & IBMR_SCLS) == IBMR_SCLS)
break;
timeout--;
if (timeout <= 0) {
dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n");
break;
}
}
writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
}
static void i2c_pxa_slave_stop(struct pxa_i2c *i2c)
{
if (i2c_debug > 2)
dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop)\n");
if (i2c->slave != NULL)
i2c_slave_event(i2c->slave, I2C_SLAVE_STOP, NULL);
if (i2c_debug > 2)
dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop) acked\n");
/*
* If we have a master-mode message waiting,
* kick it off now that the slave has completed.
*/
if (i2c->msg)
i2c_pxa_master_complete(i2c, I2C_RETRY);
}
static int i2c_pxa_slave_reg(struct i2c_client *slave)
{
struct pxa_i2c *i2c = slave->adapter->algo_data;
if (i2c->slave)
return -EBUSY;
if (!i2c->reg_isar)
return -EAFNOSUPPORT;
i2c->slave = slave;
i2c->slave_addr = slave->addr;
writel(i2c->slave_addr, _ISAR(i2c));
return 0;
}
static int i2c_pxa_slave_unreg(struct i2c_client *slave)
{
struct pxa_i2c *i2c = slave->adapter->algo_data;
WARN_ON(!i2c->slave);
i2c->slave_addr = I2C_PXA_SLAVE_ADDR;
writel(i2c->slave_addr, _ISAR(i2c));
i2c->slave = NULL;
return 0;
}
#else
static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr)
{
if (isr & ISR_BED) {
/* what should we do here? */
} else {
writel(0, _IDBR(i2c));
writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c));
}
}
static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr)
{
writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c));
}
static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr)
{
int timeout;
/*
* slave could interrupt in the middle of us generating a
* start condition... if this happens, we'd better back off
* and stop holding the poor thing up
*/
writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c));
writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c));
timeout = 0x10000;
while (1) {
if ((readl(_IBMR(i2c)) & IBMR_SCLS) == IBMR_SCLS)
break;
timeout--;
if (timeout <= 0) {
dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n");
break;
}
}
writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c));
}
static void i2c_pxa_slave_stop(struct pxa_i2c *i2c)
{
if (i2c->msg)
i2c_pxa_master_complete(i2c, I2C_RETRY);
}
#endif
/*
* PXA I2C Master mode
*/
static inline void i2c_pxa_start_message(struct pxa_i2c *i2c)
{
u32 icr;
/*
* Step 1: target slave address into IDBR
*/
i2c->req_slave_addr = i2c_8bit_addr_from_msg(i2c->msg);
writel(i2c->req_slave_addr, _IDBR(i2c));
/*
* Step 2: initiate the write.
*/
icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE);
writel(icr | ICR_START | ICR_TB, _ICR(i2c));
}
static inline void i2c_pxa_stop_message(struct pxa_i2c *i2c)
{
u32 icr;
/* Clear the START, STOP, ACK, TB and MA flags */
icr = readl(_ICR(i2c));
icr &= ~(ICR_START | ICR_STOP | ICR_ACKNAK | ICR_TB | ICR_MA);
writel(icr, _ICR(i2c));
}
/*
* PXA I2C send master code
* 1. Load master code to IDBR and send it.
* Note for HS mode, set ICR [GPIOEN].
* 2. Wait until win arbitration.
*/
static int i2c_pxa_send_mastercode(struct pxa_i2c *i2c)
{
u32 icr;
long timeout;
spin_lock_irq(&i2c->lock);
i2c->highmode_enter = true;
writel(i2c->master_code, _IDBR(i2c));
icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE);
icr |= ICR_GPIOEN | ICR_START | ICR_TB | ICR_ITEIE;
writel(icr, _ICR(i2c));
spin_unlock_irq(&i2c->lock);
timeout = wait_event_timeout(i2c->wait,
i2c->highmode_enter == false, HZ * 1);
i2c->highmode_enter = false;
return (timeout == 0) ? I2C_RETRY : 0;
}
/*
* i2c_pxa_master_complete - complete the message and wake up.
*/
static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret)
{
i2c->msg_ptr = 0;
i2c->msg = NULL;
i2c->msg_idx ++;
i2c->msg_num = 0;
if (ret)
i2c->msg_idx = ret;
if (!i2c->use_pio)
wake_up(&i2c->wait);
}
static void i2c_pxa_irq_txempty(struct pxa_i2c *i2c, u32 isr)
{
u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB);
again:
/*
* If ISR_ALD is set, we lost arbitration.
*/
if (isr & ISR_ALD) {
/*
* Do we need to do anything here? The PXA docs
* are vague about what happens.
*/
i2c_pxa_scream_blue_murder(i2c, "ALD set");
/*
* We ignore this error. We seem to see spurious ALDs
* for seemingly no reason. If we handle them as I think
* they should, we end up causing an I2C error, which
* is painful for some systems.
*/
return; /* ignore */
}
if ((isr & ISR_BED) &&
(!((i2c->msg->flags & I2C_M_IGNORE_NAK) &&
(isr & ISR_ACKNAK)))) {
int ret = BUS_ERROR;
/*
* I2C bus error - either the device NAK'd us, or
* something more serious happened. If we were NAK'd
* on the initial address phase, we can retry.
*/
if (isr & ISR_ACKNAK) {
if (i2c->msg_ptr == 0 && i2c->msg_idx == 0)
ret = NO_SLAVE;
else
ret = XFER_NAKED;
}
i2c_pxa_master_complete(i2c, ret);
} else if (isr & ISR_RWM) {
/*
* Read mode. We have just sent the address byte, and
* now we must initiate the transfer.
*/
if (i2c->msg_ptr == i2c->msg->len - 1 &&
i2c->msg_idx == i2c->msg_num - 1)
icr |= ICR_STOP | ICR_ACKNAK;
icr |= ICR_ALDIE | ICR_TB;
} else if (i2c->msg_ptr < i2c->msg->len) {
/*
* Write mode. Write the next data byte.
*/
writel(i2c->msg->buf[i2c->msg_ptr++], _IDBR(i2c));
icr |= ICR_ALDIE | ICR_TB;
/*
* If this is the last byte of the last message or last byte
* of any message with I2C_M_STOP (e.g. SCCB), send a STOP.
*/
if ((i2c->msg_ptr == i2c->msg->len) &&
((i2c->msg->flags & I2C_M_STOP) ||
(i2c->msg_idx == i2c->msg_num - 1)))
icr |= ICR_STOP;
} else if (i2c->msg_idx < i2c->msg_num - 1) {
/*
* Next segment of the message.
*/
i2c->msg_ptr = 0;
i2c->msg_idx ++;
i2c->msg++;
/*
* If we aren't doing a repeated start and address,
* go back and try to send the next byte. Note that
* we do not support switching the R/W direction here.
*/
if (i2c->msg->flags & I2C_M_NOSTART)
goto again;
/*
* Write the next address.
*/
i2c->req_slave_addr = i2c_8bit_addr_from_msg(i2c->msg);
writel(i2c->req_slave_addr, _IDBR(i2c));
/*
* And trigger a repeated start, and send the byte.
*/
icr &= ~ICR_ALDIE;
icr |= ICR_START | ICR_TB;
} else {
if (i2c->msg->len == 0)
icr |= ICR_MA;
i2c_pxa_master_complete(i2c, 0);
}
i2c->icrlog[i2c->irqlogidx-1] = icr;
writel(icr, _ICR(i2c));
show_state(i2c);
}
static void i2c_pxa_irq_rxfull(struct pxa_i2c *i2c, u32 isr)
{
u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB);
/*
* Read the byte.
*/
i2c->msg->buf[i2c->msg_ptr++] = readl(_IDBR(i2c));
if (i2c->msg_ptr < i2c->msg->len) {
/*
* If this is the last byte of the last
* message, send a STOP.
*/
if (i2c->msg_ptr == i2c->msg->len - 1)
icr |= ICR_STOP | ICR_ACKNAK;
icr |= ICR_ALDIE | ICR_TB;
} else {
i2c_pxa_master_complete(i2c, 0);
}
i2c->icrlog[i2c->irqlogidx-1] = icr;
writel(icr, _ICR(i2c));
}
#define VALID_INT_SOURCE (ISR_SSD | ISR_ALD | ISR_ITE | ISR_IRF | \
ISR_SAD | ISR_BED)
static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id)
{
struct pxa_i2c *i2c = dev_id;
u32 isr = readl(_ISR(i2c));
if (!(isr & VALID_INT_SOURCE))
return IRQ_NONE;
if (i2c_debug > 2 && 0) {
dev_dbg(&i2c->adap.dev, "%s: ISR=%08x, ICR=%08x, IBMR=%02x\n",
__func__, isr, readl(_ICR(i2c)), readl(_IBMR(i2c)));
decode_ISR(isr);
}
if (i2c->irqlogidx < ARRAY_SIZE(i2c->isrlog))
i2c->isrlog[i2c->irqlogidx++] = isr;
show_state(i2c);
/*
* Always clear all pending IRQs.
*/
writel(isr & VALID_INT_SOURCE, _ISR(i2c));
if (isr & ISR_SAD)
i2c_pxa_slave_start(i2c, isr);
if (isr & ISR_SSD)
i2c_pxa_slave_stop(i2c);
if (i2c_pxa_is_slavemode(i2c)) {
if (isr & ISR_ITE)
i2c_pxa_slave_txempty(i2c, isr);
if (isr & ISR_IRF)
i2c_pxa_slave_rxfull(i2c, isr);
} else if (i2c->msg && (!i2c->highmode_enter)) {
if (isr & ISR_ITE)
i2c_pxa_irq_txempty(i2c, isr);
if (isr & ISR_IRF)
i2c_pxa_irq_rxfull(i2c, isr);
} else if ((isr & ISR_ITE) && i2c->highmode_enter) {
i2c->highmode_enter = false;
wake_up(&i2c->wait);
} else {
i2c_pxa_scream_blue_murder(i2c, "spurious irq");
}
return IRQ_HANDLED;
}
/*
* We are protected by the adapter bus mutex.
*/
static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
{
long timeout;
int ret;
/*
* Wait for the bus to become free.
*/
ret = i2c_pxa_wait_bus_not_busy(i2c);
if (ret) {
dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n");
i2c_recover_bus(&i2c->adap);
goto out;
}
/*
* Set master mode.
*/
ret = i2c_pxa_set_master(i2c);
if (ret) {
dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret);
goto out;
}
if (i2c->high_mode) {
ret = i2c_pxa_send_mastercode(i2c);
if (ret) {
dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n");
goto out;
}
}
spin_lock_irq(&i2c->lock);
i2c->msg = msg;
i2c->msg_num = num;
i2c->msg_idx = 0;
i2c->msg_ptr = 0;
i2c->irqlogidx = 0;
i2c_pxa_start_message(i2c);
spin_unlock_irq(&i2c->lock);
/*
* The rest of the processing occurs in the interrupt handler.
*/
timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
i2c_pxa_stop_message(i2c);
/*
* We place the return code in i2c->msg_idx.
*/
ret = i2c->msg_idx;
if (!timeout && i2c->msg_num) {
i2c_pxa_scream_blue_murder(i2c, "timeout with active message");
i2c_recover_bus(&i2c->adap);
ret = I2C_RETRY;
}
out:
return ret;
}
static int i2c_pxa_internal_xfer(struct pxa_i2c *i2c,
struct i2c_msg *msgs, int num,
int (*xfer)(struct pxa_i2c *,
struct i2c_msg *, int num))
{
int ret, i;
for (i = 0; ; ) {
ret = xfer(i2c, msgs, num);
if (ret != I2C_RETRY && ret != NO_SLAVE)
goto out;
if (++i >= i2c->adap.retries)
break;
if (i2c_debug)
dev_dbg(&i2c->adap.dev, "Retrying transmission\n");
udelay(100);
}
if (ret != NO_SLAVE)
i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
ret = -EREMOTEIO;
out:
i2c_pxa_set_slave(i2c, ret);
return ret;
}
static int i2c_pxa_xfer(struct i2c_adapter *adap,
struct i2c_msg msgs[], int num)
{
struct pxa_i2c *i2c = adap->algo_data;
return i2c_pxa_internal_xfer(i2c, msgs, num, i2c_pxa_do_xfer);
}
static u32 i2c_pxa_functionality(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
I2C_FUNC_PROTOCOL_MANGLING | I2C_FUNC_NOSTART;
}
static const struct i2c_algorithm i2c_pxa_algorithm = {
.master_xfer = i2c_pxa_xfer,
.functionality = i2c_pxa_functionality,
#ifdef CONFIG_I2C_PXA_SLAVE
.reg_slave = i2c_pxa_slave_reg,
.unreg_slave = i2c_pxa_slave_unreg,
#endif
};
/* Non-interrupt mode support */
static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
{
/* make timeout the same as for interrupt based functions */
long timeout = 2 * DEF_TIMEOUT;
/*
* Wait for the bus to become free.
*/
while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB))
udelay(1000);
if (timeout < 0) {
show_state(i2c);
dev_err(&i2c->adap.dev,
"i2c_pxa: timeout waiting for bus free (set_master)\n");
return I2C_RETRY;
}
/*
* Set master mode.
*/
writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
return 0;
}
static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
struct i2c_msg *msg, int num)
{
unsigned long timeout = 500000; /* 5 seconds */
int ret = 0;
ret = i2c_pxa_pio_set_master(i2c);
if (ret)
goto out;
i2c->msg = msg;
i2c->msg_num = num;
i2c->msg_idx = 0;
i2c->msg_ptr = 0;
i2c->irqlogidx = 0;
i2c_pxa_start_message(i2c);
while (i2c->msg_num > 0 && --timeout) {
i2c_pxa_handler(0, i2c);
udelay(10);
}
i2c_pxa_stop_message(i2c);
/*
* We place the return code in i2c->msg_idx.
*/
ret = i2c->msg_idx;
out:
if (timeout == 0) {
i2c_pxa_scream_blue_murder(i2c, "timeout (do_pio_xfer)");
ret = I2C_RETRY;
}
return ret;
}
static int i2c_pxa_pio_xfer(struct i2c_adapter *adap,
struct i2c_msg msgs[], int num)
{
struct pxa_i2c *i2c = adap->algo_data;
/* If the I2C controller is disabled we need to reset it
(probably due to a suspend/resume destroying state). We do
this here as we can then avoid worrying about resuming the
controller before its users. */
if (!(readl(_ICR(i2c)) & ICR_IUE))
i2c_pxa_reset(i2c);
return i2c_pxa_internal_xfer(i2c, msgs, num, i2c_pxa_do_pio_xfer);
}
static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
.master_xfer = i2c_pxa_pio_xfer,
.functionality = i2c_pxa_functionality,
#ifdef CONFIG_I2C_PXA_SLAVE
.reg_slave = i2c_pxa_slave_reg,
.unreg_slave = i2c_pxa_slave_unreg,
#endif
};
static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
enum pxa_i2c_types *i2c_types)
{
struct device_node *np = pdev->dev.of_node;
const struct of_device_id *of_id =
of_match_device(i2c_pxa_dt_ids, &pdev->dev);
if (!of_id)
return 1;
/* For device tree we always use the dynamic or alias-assigned ID */
i2c->adap.nr = -1;
i2c->use_pio = of_property_read_bool(np, "mrvl,i2c-polling");
i2c->fast_mode = of_property_read_bool(np, "mrvl,i2c-fast-mode");
*i2c_types = (enum pxa_i2c_types)(of_id->data);
return 0;
}
static int i2c_pxa_probe_pdata(struct platform_device *pdev,
struct pxa_i2c *i2c,
enum pxa_i2c_types *i2c_types)
{
struct i2c_pxa_platform_data *plat = dev_get_platdata(&pdev->dev);
const struct platform_device_id *id = platform_get_device_id(pdev);
*i2c_types = id->driver_data;
if (plat) {
i2c->use_pio = plat->use_pio;
i2c->fast_mode = plat->fast_mode;
i2c->high_mode = plat->high_mode;
i2c->master_code = plat->master_code;
if (!i2c->master_code)
i2c->master_code = 0xe;
i2c->rate = plat->rate;
}
return 0;
}
static void i2c_pxa_prepare_recovery(struct i2c_adapter *adap)
{
struct pxa_i2c *i2c = adap->algo_data;
u32 ibmr = readl(_IBMR(i2c));
/*
* Program the GPIOs to reflect the current I2C bus state while
* we transition to recovery; this avoids glitching the bus.
*/
gpiod_set_value(i2c->recovery.scl_gpiod, ibmr & IBMR_SCLS);
gpiod_set_value(i2c->recovery.sda_gpiod, ibmr & IBMR_SDAS);
}
static void i2c_pxa_unprepare_recovery(struct i2c_adapter *adap)
{
struct pxa_i2c *i2c = adap->algo_data;
struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
u32 isr;
/*
* The bus should now be free. Clear up the I2C controller before
* handing control of the bus back to avoid the bus changing state.
*/
isr = readl(_ISR(i2c));
if (isr & (ISR_UB | ISR_IBB)) {
dev_dbg(&i2c->adap.dev,
"recovery: resetting controller, ISR=0x%08x\n", isr);
i2c_pxa_do_reset(i2c);
}
WARN_ON(pinctrl_select_state(bri->pinctrl, bri->pins_default));
dev_dbg(&i2c->adap.dev, "recovery: IBMR 0x%08x ISR 0x%08x\n",
readl(_IBMR(i2c)), readl(_ISR(i2c)));
i2c_pxa_enable(i2c);
}
static int i2c_pxa_init_recovery(struct pxa_i2c *i2c)
{
struct i2c_bus_recovery_info *bri = &i2c->recovery;
struct device *dev = i2c->adap.dev.parent;
/*
* When slave mode is enabled, we are not the only master on the bus.
* Bus recovery can only be performed when we are the master, which
* we can't be certain of. Therefore, when slave mode is enabled, do
* not configure bus recovery.
*/
if (IS_ENABLED(CONFIG_I2C_PXA_SLAVE))
return 0;
bri->pinctrl = devm_pinctrl_get(dev);
if (PTR_ERR(bri->pinctrl) == -ENODEV) {
bri->pinctrl = NULL;
return 0;
}
if (IS_ERR(bri->pinctrl))
return PTR_ERR(bri->pinctrl);
bri->prepare_recovery = i2c_pxa_prepare_recovery;
bri->unprepare_recovery = i2c_pxa_unprepare_recovery;
i2c->adap.bus_recovery_info = bri;
return 0;
}
static int i2c_pxa_probe(struct platform_device *dev)
{
struct i2c_pxa_platform_data *plat = dev_get_platdata(&dev->dev);
enum pxa_i2c_types i2c_type;
struct pxa_i2c *i2c;
struct resource *res = NULL;
int ret, irq;
i2c = devm_kzalloc(&dev->dev, sizeof(struct pxa_i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
/* Default adapter num to device id; i2c_pxa_probe_dt can override. */
i2c->adap.nr = dev->id;
i2c->adap.owner = THIS_MODULE;
i2c->adap.retries = 5;
i2c->adap.algo_data = i2c;
i2c->adap.dev.parent = &dev->dev;
#ifdef CONFIG_OF
i2c->adap.dev.of_node = dev->dev.of_node;
#endif
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
i2c->reg_base = devm_ioremap_resource(&dev->dev, res);
if (IS_ERR(i2c->reg_base))
return PTR_ERR(i2c->reg_base);
irq = platform_get_irq(dev, 0);
if (irq < 0)
return irq;
ret = i2c_pxa_init_recovery(i2c);
if (ret)
return ret;
ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type);
if (ret > 0)
ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
if (ret < 0)
return ret;
spin_lock_init(&i2c->lock);
init_waitqueue_head(&i2c->wait);
strscpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name));
i2c->clk = devm_clk_get(&dev->dev, NULL);
if (IS_ERR(i2c->clk)) {
dev_err(&dev->dev, "failed to get the clk: %ld\n", PTR_ERR(i2c->clk));
return PTR_ERR(i2c->clk);
}
i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr;
i2c->reg_idbr = i2c->reg_base + pxa_reg_layout[i2c_type].idbr;
i2c->reg_icr = i2c->reg_base + pxa_reg_layout[i2c_type].icr;
i2c->reg_isr = i2c->reg_base + pxa_reg_layout[i2c_type].isr;
i2c->fm_mask = pxa_reg_layout[i2c_type].fm;
i2c->hs_mask = pxa_reg_layout[i2c_type].hs;
if (i2c_type != REGS_CE4100)
i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar;
if (i2c_type == REGS_PXA910) {
i2c->reg_ilcr = i2c->reg_base + pxa_reg_layout[i2c_type].ilcr;
i2c->reg_iwcr = i2c->reg_base + pxa_reg_layout[i2c_type].iwcr;
}
i2c->iobase = res->start;
i2c->iosize = resource_size(res);
i2c->irq = irq;
i2c->slave_addr = I2C_PXA_SLAVE_ADDR;
i2c->highmode_enter = false;
if (plat) {
i2c->adap.class = plat->class;
}
if (i2c->high_mode) {
if (i2c->rate) {
clk_set_rate(i2c->clk, i2c->rate);
pr_info("i2c: <%s> set rate to %ld\n",
i2c->adap.name, clk_get_rate(i2c->clk));
} else
pr_warn("i2c: <%s> clock rate not set\n",
i2c->adap.name);
}
clk_prepare_enable(i2c->clk);
if (i2c->use_pio) {
i2c->adap.algo = &i2c_pxa_pio_algorithm;
} else {
i2c->adap.algo = &i2c_pxa_algorithm;
ret = devm_request_irq(&dev->dev, irq, i2c_pxa_handler,
IRQF_SHARED | IRQF_NO_SUSPEND,
dev_name(&dev->dev), i2c);
if (ret) {
dev_err(&dev->dev, "failed to request irq: %d\n", ret);
goto ereqirq;
}
}
i2c_pxa_reset(i2c);
ret = i2c_add_numbered_adapter(&i2c->adap);
if (ret < 0)
goto ereqirq;
platform_set_drvdata(dev, i2c);
#ifdef CONFIG_I2C_PXA_SLAVE
dev_info(&i2c->adap.dev, " PXA I2C adapter, slave address %d\n",
i2c->slave_addr);
#else
dev_info(&i2c->adap.dev, " PXA I2C adapter\n");
#endif
return 0;
ereqirq:
clk_disable_unprepare(i2c->clk);
return ret;
}
static void i2c_pxa_remove(struct platform_device *dev)
{
struct pxa_i2c *i2c = platform_get_drvdata(dev);
i2c_del_adapter(&i2c->adap);
clk_disable_unprepare(i2c->clk);
}
static int i2c_pxa_suspend_noirq(struct device *dev)
{
struct pxa_i2c *i2c = dev_get_drvdata(dev);
clk_disable(i2c->clk);
return 0;
}
static int i2c_pxa_resume_noirq(struct device *dev)
{
struct pxa_i2c *i2c = dev_get_drvdata(dev);
clk_enable(i2c->clk);
i2c_pxa_reset(i2c);
return 0;
}
static const struct dev_pm_ops i2c_pxa_dev_pm_ops = {
.suspend_noirq = i2c_pxa_suspend_noirq,
.resume_noirq = i2c_pxa_resume_noirq,
};
static struct platform_driver i2c_pxa_driver = {
.probe = i2c_pxa_probe,
.remove_new = i2c_pxa_remove,
.driver = {
.name = "pxa2xx-i2c",
.pm = pm_sleep_ptr(&i2c_pxa_dev_pm_ops),
.of_match_table = i2c_pxa_dt_ids,
},
.id_table = i2c_pxa_id_table,
};
static int __init i2c_adap_pxa_init(void)
{
return platform_driver_register(&i2c_pxa_driver);
}
static void __exit i2c_adap_pxa_exit(void)
{
platform_driver_unregister(&i2c_pxa_driver);
}
MODULE_LICENSE("GPL");
subsys_initcall(i2c_adap_pxa_init);
module_exit(i2c_adap_pxa_exit);
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