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u-boot/drivers/i2c/omap24xx_i2c.c
Tom Rini 14376b8e6c ti: i2c: Convert CONFIG_SYS_OMAP24_I2C to CONFIG_SYS_I2C namespace 
The omap24xx I2C driver uses its own CONFIG namespace for common I2C
variables.  Rather than convert more of them to Kconfig, rename these to
the common I2C ones and remove the entirely unused functionality.  As
part of this, we make the am335x_shc platforms consistent with their
intended speed values.

Signed-off-by: Tom Rini <trini@konsulko.com>
2021-08-30 14:10:07 -04:00

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/*
* Basic I2C functions
*
* Copyright (c) 2004 Texas Instruments
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the license found in the file
* named COPYING that should have accompanied this file.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Author: Jian Zhang jzhang@ti.com, Texas Instruments
*
* Copyright (c) 2003 Wolfgang Denk, wd@denx.de
* Rewritten to fit into the current U-Boot framework
*
* Adapted for OMAP2420 I2C, r-woodruff2@ti.com
*
* Copyright (c) 2013 Lubomir Popov <lpopov@mm-sol.com>, MM Solutions
* New i2c_read, i2c_write and i2c_probe functions, tested on OMAP4
* (4430/60/70), OMAP5 (5430) and AM335X (3359); should work on older
* OMAPs and derivatives as well. The only anticipated exception would
* be the OMAP2420, which shall require driver modification.
* - Rewritten i2c_read to operate correctly with all types of chips
* (old function could not read consistent data from some I2C slaves).
* - Optimized i2c_write.
* - New i2c_probe, performs write access vs read. The old probe could
* hang the system under certain conditions (e.g. unconfigured pads).
* - The read/write/probe functions try to identify unconfigured bus.
* - Status functions now read irqstatus_raw as per TRM guidelines
* (except for OMAP243X and OMAP34XX).
* - Driver now supports up to I2C5 (OMAP5).
*
* Copyright (c) 2014 Hannes Schmelzer <oe5hpm@oevsv.at>, B&R
* - Added support for set_speed
*
*/
#include <common.h>
#include <dm.h>
#include <i2c.h>
#include <log.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/omap_i2c.h>
/*
* Provide access to architecture-specific I2C header files for platforms
* that are NOT yet solely relying on CONFIG_DM_I2C, CONFIG_OF_CONTROL, and
* the defaults provided in 'omap24xx_i2c.h' for all U-Boot stages where I2C
* access is desired.
*/
#ifndef CONFIG_ARCH_K3
#include <asm/arch/i2c.h>
#endif
#include "omap24xx_i2c.h"
#define I2C_TIMEOUT 1000
/* Absolutely safe for status update at 100 kHz I2C: */
#define I2C_WAIT 200
enum {
OMAP_I2C_REV_REG = 0, /* Only on IP V1 (OMAP34XX) */
OMAP_I2C_IE_REG, /* Only on IP V1 (OMAP34XX) */
OMAP_I2C_STAT_REG,
OMAP_I2C_WE_REG,
OMAP_I2C_SYSS_REG,
OMAP_I2C_BUF_REG,
OMAP_I2C_CNT_REG,
OMAP_I2C_DATA_REG,
OMAP_I2C_SYSC_REG,
OMAP_I2C_CON_REG,
OMAP_I2C_OA_REG,
OMAP_I2C_SA_REG,
OMAP_I2C_PSC_REG,
OMAP_I2C_SCLL_REG,
OMAP_I2C_SCLH_REG,
OMAP_I2C_SYSTEST_REG,
OMAP_I2C_BUFSTAT_REG,
/* Only on IP V2 (OMAP4430, etc.) */
OMAP_I2C_IP_V2_REVNB_LO,
OMAP_I2C_IP_V2_REVNB_HI,
OMAP_I2C_IP_V2_IRQSTATUS_RAW,
OMAP_I2C_IP_V2_IRQENABLE_SET,
OMAP_I2C_IP_V2_IRQENABLE_CLR,
};
static const u8 __maybe_unused reg_map_ip_v1[] = {
[OMAP_I2C_REV_REG] = 0x00,
[OMAP_I2C_IE_REG] = 0x04,
[OMAP_I2C_STAT_REG] = 0x08,
[OMAP_I2C_WE_REG] = 0x0c,
[OMAP_I2C_SYSS_REG] = 0x10,
[OMAP_I2C_BUF_REG] = 0x14,
[OMAP_I2C_CNT_REG] = 0x18,
[OMAP_I2C_DATA_REG] = 0x1c,
[OMAP_I2C_SYSC_REG] = 0x20,
[OMAP_I2C_CON_REG] = 0x24,
[OMAP_I2C_OA_REG] = 0x28,
[OMAP_I2C_SA_REG] = 0x2c,
[OMAP_I2C_PSC_REG] = 0x30,
[OMAP_I2C_SCLL_REG] = 0x34,
[OMAP_I2C_SCLH_REG] = 0x38,
[OMAP_I2C_SYSTEST_REG] = 0x3c,
[OMAP_I2C_BUFSTAT_REG] = 0x40,
};
static const u8 __maybe_unused reg_map_ip_v2[] = {
[OMAP_I2C_STAT_REG] = 0x28,
[OMAP_I2C_WE_REG] = 0x34,
[OMAP_I2C_SYSS_REG] = 0x90,
[OMAP_I2C_BUF_REG] = 0x94,
[OMAP_I2C_CNT_REG] = 0x98,
[OMAP_I2C_DATA_REG] = 0x9c,
[OMAP_I2C_SYSC_REG] = 0x10,
[OMAP_I2C_CON_REG] = 0xa4,
[OMAP_I2C_OA_REG] = 0xa8,
[OMAP_I2C_SA_REG] = 0xac,
[OMAP_I2C_PSC_REG] = 0xb0,
[OMAP_I2C_SCLL_REG] = 0xb4,
[OMAP_I2C_SCLH_REG] = 0xb8,
[OMAP_I2C_SYSTEST_REG] = 0xbc,
[OMAP_I2C_BUFSTAT_REG] = 0xc0,
[OMAP_I2C_IP_V2_REVNB_LO] = 0x00,
[OMAP_I2C_IP_V2_REVNB_HI] = 0x04,
[OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24,
[OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c,
[OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30,
};
struct omap_i2c {
struct udevice *clk;
int ip_rev;
struct i2c *regs;
unsigned int speed;
int waitdelay;
int clk_id;
};
static inline const u8 *omap_i2c_get_ip_reg_map(int ip_rev)
{
switch (ip_rev) {
case OMAP_I2C_REV_V1:
return reg_map_ip_v1;
case OMAP_I2C_REV_V2:
/* Fall through... */
default:
return reg_map_ip_v2;
}
}
static inline void omap_i2c_write_reg(void __iomem *base, int ip_rev,
u16 val, int reg)
{
writew(val, base + omap_i2c_get_ip_reg_map(ip_rev)[reg]);
}
static inline u16 omap_i2c_read_reg(void __iomem *base, int ip_rev, int reg)
{
return readw(base + omap_i2c_get_ip_reg_map(ip_rev)[reg]);
}
static int omap24_i2c_findpsc(u32 *pscl, u32 *psch, uint speed)
{
unsigned long internal_clk = 0, fclk;
unsigned int prescaler;
/*
* This method is only called for Standard and Fast Mode speeds
*
* For some TI SoCs it is explicitly written in TRM (e,g, SPRUHZ6G,
* page 5685, Table 24-7)
* that the internal I2C clock (after prescaler) should be between
* 7-12 MHz (at least for Fast Mode (FS)).
*
* Such approach is used in v4.9 Linux kernel in:
* ./drivers/i2c/busses/i2c-omap.c (omap_i2c_init function).
*/
speed /= 1000; /* convert speed to kHz */
if (speed > 100)
internal_clk = 9600;
else
internal_clk = 4000;
fclk = I2C_IP_CLK / 1000;
prescaler = fclk / internal_clk;
prescaler = prescaler - 1;
if (speed > 100) {
unsigned long scl;
/* Fast mode */
scl = internal_clk / speed;
*pscl = scl - (scl / 3) - I2C_FASTSPEED_SCLL_TRIM;
*psch = (scl / 3) - I2C_FASTSPEED_SCLH_TRIM;
} else {
/* Standard mode */
*pscl = internal_clk / (speed * 2) - I2C_FASTSPEED_SCLL_TRIM;
*psch = internal_clk / (speed * 2) - I2C_FASTSPEED_SCLH_TRIM;
}
debug("%s: speed [kHz]: %d psc: 0x%x sscl: 0x%x ssch: 0x%x\n",
__func__, speed, prescaler, *pscl, *psch);
if (*pscl <= 0 || *psch <= 0 || prescaler <= 0)
return -EINVAL;
return prescaler;
}
/*
* Wait for the bus to be free by checking the Bus Busy (BB)
* bit to become clear
*/
static int wait_for_bb(void __iomem *i2c_base, int ip_rev, int waitdelay)
{
int timeout = I2C_TIMEOUT;
int irq_stat_reg;
u16 stat;
irq_stat_reg = (ip_rev == OMAP_I2C_REV_V1) ?
OMAP_I2C_STAT_REG : OMAP_I2C_IP_V2_IRQSTATUS_RAW;
/* clear current interrupts */
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
while ((stat = omap_i2c_read_reg(i2c_base, ip_rev, irq_stat_reg) &
I2C_STAT_BB) && timeout--) {
omap_i2c_write_reg(i2c_base, ip_rev, stat, OMAP_I2C_STAT_REG);
udelay(waitdelay);
}
if (timeout <= 0) {
printf("Timed out in %s: status=%04x\n", __func__, stat);
return 1;
}
/* clear delayed stuff */
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
return 0;
}
/*
* Wait for the I2C controller to complete current action
* and update status
*/
static u16 wait_for_event(void __iomem *i2c_base, int ip_rev, int waitdelay)
{
u16 status;
int timeout = I2C_TIMEOUT;
int irq_stat_reg;
irq_stat_reg = (ip_rev == OMAP_I2C_REV_V1) ?
OMAP_I2C_STAT_REG : OMAP_I2C_IP_V2_IRQSTATUS_RAW;
do {
udelay(waitdelay);
status = omap_i2c_read_reg(i2c_base, ip_rev, irq_stat_reg);
} while (!(status &
(I2C_STAT_ROVR | I2C_STAT_XUDF | I2C_STAT_XRDY |
I2C_STAT_RRDY | I2C_STAT_ARDY | I2C_STAT_NACK |
I2C_STAT_AL)) && timeout--);
if (timeout <= 0) {
printf("Timed out in %s: status=%04x\n", __func__, status);
/*
* If status is still 0 here, probably the bus pads have
* not been configured for I2C, and/or pull-ups are missing.
*/
printf("Check if pads/pull-ups of bus are properly configured\n");
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
status = 0;
}
return status;
}
static void flush_fifo(void __iomem *i2c_base, int ip_rev)
{
u16 stat;
/*
* note: if you try and read data when its not there or ready
* you get a bus error
*/
while (1) {
stat = omap_i2c_read_reg(i2c_base, ip_rev, OMAP_I2C_STAT_REG);
if (stat == I2C_STAT_RRDY) {
omap_i2c_read_reg(i2c_base, ip_rev, OMAP_I2C_DATA_REG);
omap_i2c_write_reg(i2c_base, ip_rev,
I2C_STAT_RRDY, OMAP_I2C_STAT_REG);
udelay(1000);
} else
break;
}
}
static int __omap24_i2c_setspeed(void __iomem *i2c_base, int ip_rev, uint speed,
int *waitdelay)
{
int psc, fsscll = 0, fssclh = 0;
int hsscll = 0, hssclh = 0;
u32 scll = 0, sclh = 0;
if (speed >= I2C_SPEED_HIGH_RATE) {
/* High speed */
psc = I2C_IP_CLK / I2C_INTERNAL_SAMPLING_CLK;
psc -= 1;
if (psc < I2C_PSC_MIN) {
printf("Error : I2C unsupported prescaler %d\n", psc);
return -1;
}
/* For first phase of HS mode */
fsscll = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
fssclh = fsscll;
fsscll -= I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM;
fssclh -= I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM;
if (((fsscll < 0) || (fssclh < 0)) ||
((fsscll > 255) || (fssclh > 255))) {
puts("Error : I2C initializing first phase clock\n");
return -1;
}
/* For second phase of HS mode */
hsscll = hssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
hsscll -= I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM;
hssclh -= I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM;
if (((fsscll < 0) || (fssclh < 0)) ||
((fsscll > 255) || (fssclh > 255))) {
puts("Error : I2C initializing second phase clock\n");
return -1;
}
scll = (unsigned int)hsscll << 8 | (unsigned int)fsscll;
sclh = (unsigned int)hssclh << 8 | (unsigned int)fssclh;
} else {
/* Standard and fast speed */
psc = omap24_i2c_findpsc(&scll, &sclh, speed);
if (0 > psc) {
puts("Error : I2C initializing clock\n");
return -1;
}
}
/* wait for 20 clkperiods */
*waitdelay = (10000000 / speed) * 2;
omap_i2c_write_reg(i2c_base, ip_rev, 0, OMAP_I2C_CON_REG);
omap_i2c_write_reg(i2c_base, ip_rev, psc, OMAP_I2C_PSC_REG);
omap_i2c_write_reg(i2c_base, ip_rev, scll, OMAP_I2C_SCLL_REG);
omap_i2c_write_reg(i2c_base, ip_rev, sclh, OMAP_I2C_SCLH_REG);
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN, OMAP_I2C_CON_REG);
/* clear all pending status */
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
return 0;
}
static void omap24_i2c_deblock(void __iomem *i2c_base, int ip_rev)
{
int i;
u16 systest;
u16 orgsystest;
/* set test mode ST_EN = 1 */
orgsystest = omap_i2c_read_reg(i2c_base, ip_rev, OMAP_I2C_SYSTEST_REG);
systest = orgsystest;
/* enable testmode */
systest |= I2C_SYSTEST_ST_EN;
omap_i2c_write_reg(i2c_base, ip_rev, systest, OMAP_I2C_SYSTEST_REG);
systest &= ~I2C_SYSTEST_TMODE_MASK;
systest |= 3 << I2C_SYSTEST_TMODE_SHIFT;
omap_i2c_write_reg(i2c_base, ip_rev, systest, OMAP_I2C_SYSTEST_REG);
/* set SCL, SDA = 1 */
systest |= I2C_SYSTEST_SCL_O | I2C_SYSTEST_SDA_O;
omap_i2c_write_reg(i2c_base, ip_rev, systest, OMAP_I2C_SYSTEST_REG);
udelay(10);
/* toggle scl 9 clocks */
for (i = 0; i < 9; i++) {
/* SCL = 0 */
systest &= ~I2C_SYSTEST_SCL_O;
omap_i2c_write_reg(i2c_base, ip_rev,
systest, OMAP_I2C_SYSTEST_REG);
udelay(10);
/* SCL = 1 */
systest |= I2C_SYSTEST_SCL_O;
omap_i2c_write_reg(i2c_base, ip_rev,
systest, OMAP_I2C_SYSTEST_REG);
udelay(10);
}
/* send stop */
systest &= ~I2C_SYSTEST_SDA_O;
omap_i2c_write_reg(i2c_base, ip_rev, systest, OMAP_I2C_SYSTEST_REG);
udelay(10);
systest |= I2C_SYSTEST_SCL_O | I2C_SYSTEST_SDA_O;
omap_i2c_write_reg(i2c_base, ip_rev, systest, OMAP_I2C_SYSTEST_REG);
udelay(10);
/* restore original mode */
omap_i2c_write_reg(i2c_base, ip_rev, orgsystest, OMAP_I2C_SYSTEST_REG);
}
static void __omap24_i2c_init(void __iomem *i2c_base, int ip_rev, int speed,
int slaveadd, int *waitdelay)
{
int timeout = I2C_TIMEOUT;
int deblock = 1;
retry:
if (omap_i2c_read_reg(i2c_base, ip_rev, OMAP_I2C_CON_REG) &
I2C_CON_EN) {
omap_i2c_write_reg(i2c_base, ip_rev, 0, OMAP_I2C_CON_REG);
udelay(50000);
}
/* for ES2 after soft reset */
omap_i2c_write_reg(i2c_base, ip_rev, 0x2, OMAP_I2C_SYSC_REG);
udelay(1000);
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN, OMAP_I2C_CON_REG);
while (!(omap_i2c_read_reg(i2c_base, ip_rev, OMAP_I2C_SYSS_REG) &
I2C_SYSS_RDONE) && timeout--) {
if (timeout <= 0) {
puts("ERROR: Timeout in soft-reset\n");
return;
}
udelay(1000);
}
if (__omap24_i2c_setspeed(i2c_base, ip_rev, speed, waitdelay)) {
printf("ERROR: failed to setup I2C bus-speed!\n");
return;
}
/* own address */
omap_i2c_write_reg(i2c_base, ip_rev, slaveadd, OMAP_I2C_OA_REG);
if (ip_rev == OMAP_I2C_REV_V1) {
/*
* Have to enable interrupts for OMAP2/3, these IPs don't have
* an 'irqstatus_raw' register and we shall have to poll 'stat'
*/
omap_i2c_write_reg(i2c_base, ip_rev, I2C_IE_XRDY_IE |
I2C_IE_RRDY_IE | I2C_IE_ARDY_IE |
I2C_IE_NACK_IE | I2C_IE_AL_IE,
OMAP_I2C_IE_REG);
}
udelay(1000);
flush_fifo(i2c_base, ip_rev);
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
/* Handle possible failed I2C state */
if (wait_for_bb(i2c_base, ip_rev, *waitdelay))
if (deblock == 1) {
omap24_i2c_deblock(i2c_base, ip_rev);
deblock = 0;
goto retry;
}
}
/*
* i2c_probe: Use write access. Allows to identify addresses that are
* write-only (like the config register of dual-port EEPROMs)
*/
static int __omap24_i2c_probe(void __iomem *i2c_base, int ip_rev, int waitdelay,
uchar chip)
{
u16 status;
int res = 1; /* default = fail */
if (chip == omap_i2c_read_reg(i2c_base, ip_rev, OMAP_I2C_OA_REG))
return res;
/* Wait until bus is free */
if (wait_for_bb(i2c_base, ip_rev, waitdelay))
return res;
/* No data transfer, slave addr only */
omap_i2c_write_reg(i2c_base, ip_rev, chip, OMAP_I2C_SA_REG);
/* Stop bit needed here */
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN | I2C_CON_MST |
I2C_CON_STT | I2C_CON_TRX | I2C_CON_STP,
OMAP_I2C_CON_REG);
status = wait_for_event(i2c_base, ip_rev, waitdelay);
if ((status & ~I2C_STAT_XRDY) == 0 || (status & I2C_STAT_AL)) {
/*
* With current high-level command implementation, notifying
* the user shall flood the console with 127 messages. If
* silent exit is desired upon unconfigured bus, remove the
* following 'if' section:
*/
if (status == I2C_STAT_XRDY)
printf("i2c_probe: pads on bus probably not configured (status=0x%x)\n",
status);
goto pr_exit;
}
/* Check for ACK (!NAK) */
if (!(status & I2C_STAT_NACK)) {
res = 0; /* Device found */
udelay(waitdelay);/* Required by AM335X in SPL */
/* Abort transfer (force idle state) */
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_MST | I2C_CON_TRX,
OMAP_I2C_CON_REG); /* Reset */
udelay(1000);
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN | I2C_CON_MST |
I2C_CON_TRX | I2C_CON_STP,
OMAP_I2C_CON_REG); /* STP */
}
pr_exit:
flush_fifo(i2c_base, ip_rev);
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
return res;
}
/*
* i2c_read: Function now uses a single I2C read transaction with bulk transfer
* of the requested number of bytes (note that the 'i2c md' command
* limits this to 16 bytes anyway). If CONFIG_I2C_REPEATED_START is
* defined in the board config header, this transaction shall be with
* Repeated Start (Sr) between the address and data phases; otherwise
* Stop-Start (P-S) shall be used (some I2C chips do require a P-S).
* The address (reg offset) may be 0, 1 or 2 bytes long.
* Function now reads correctly from chips that return more than one
* byte of data per addressed register (like TI temperature sensors),
* or that do not need a register address at all (such as some clock
* distributors).
*/
static int __omap24_i2c_read(void __iomem *i2c_base, int ip_rev, int waitdelay,
uchar chip, uint addr, int alen, uchar *buffer,
int len)
{
int i2c_error = 0;
u16 status;
if (alen < 0) {
puts("I2C read: addr len < 0\n");
return 1;
}
if (len < 0) {
puts("I2C read: data len < 0\n");
return 1;
}
if (buffer == NULL) {
puts("I2C read: NULL pointer passed\n");
return 1;
}
if (alen > 2) {
printf("I2C read: addr len %d not supported\n", alen);
return 1;
}
if (addr + len > (1 << 16)) {
puts("I2C read: address out of range\n");
return 1;
}
#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
/*
* EEPROM chips that implement "address overflow" are ones
* like Catalyst 24WC04/08/16 which has 9/10/11 bits of
* address and the extra bits end up in the "chip address"
* bit slots. This makes a 24WC08 (1Kbyte) chip look like
* four 256 byte chips.
*
* Note that we consider the length of the address field to
* still be one byte because the extra address bits are
* hidden in the chip address.
*/
if (alen > 0)
chip |= ((addr >> (alen * 8)) &
CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
#endif
/* Wait until bus not busy */
if (wait_for_bb(i2c_base, ip_rev, waitdelay))
return 1;
/* Zero, one or two bytes reg address (offset) */
omap_i2c_write_reg(i2c_base, ip_rev, alen, OMAP_I2C_CNT_REG);
/* Set slave address */
omap_i2c_write_reg(i2c_base, ip_rev, chip, OMAP_I2C_SA_REG);
if (alen) {
/* Must write reg offset first */
#ifdef CONFIG_I2C_REPEATED_START
/* No stop bit, use Repeated Start (Sr) */
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN | I2C_CON_MST |
I2C_CON_STT | I2C_CON_TRX, OMAP_I2C_CON_REG);
#else
/* Stop - Start (P-S) */
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN | I2C_CON_MST |
I2C_CON_STT | I2C_CON_STP | I2C_CON_TRX,
OMAP_I2C_CON_REG);
#endif
/* Send register offset */
while (1) {
status = wait_for_event(i2c_base, ip_rev, waitdelay);
/* Try to identify bus that is not padconf'd for I2C */
if (status == I2C_STAT_XRDY) {
i2c_error = 2;
printf("i2c_read (addr phase): pads on bus probably not configured (status=0x%x)\n",
status);
goto rd_exit;
}
if (status == 0 || (status & I2C_STAT_NACK)) {
i2c_error = 1;
printf("i2c_read: error waiting for addr ACK (status=0x%x)\n",
status);
goto rd_exit;
}
if (alen) {
if (status & I2C_STAT_XRDY) {
u8 addr_byte;
alen--;
addr_byte = (addr >> (8 * alen)) & 0xff;
omap_i2c_write_reg(i2c_base, ip_rev,
addr_byte,
OMAP_I2C_DATA_REG);
omap_i2c_write_reg(i2c_base, ip_rev,
I2C_STAT_XRDY,
OMAP_I2C_STAT_REG);
}
}
if (status & I2C_STAT_ARDY) {
omap_i2c_write_reg(i2c_base, ip_rev,
I2C_STAT_ARDY,
OMAP_I2C_STAT_REG);
break;
}
}
}
/* Set slave address */
omap_i2c_write_reg(i2c_base, ip_rev, chip, OMAP_I2C_SA_REG);
/* Read len bytes from slave */
omap_i2c_write_reg(i2c_base, ip_rev, len, OMAP_I2C_CNT_REG);
/* Need stop bit here */
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN | I2C_CON_MST |
I2C_CON_STT | I2C_CON_STP, OMAP_I2C_CON_REG);
/* Receive data */
while (1) {
status = wait_for_event(i2c_base, ip_rev, waitdelay);
/*
* Try to identify bus that is not padconf'd for I2C. This
* state could be left over from previous transactions if
* the address phase is skipped due to alen=0.
*/
if (status == I2C_STAT_XRDY) {
i2c_error = 2;
printf("i2c_read (data phase): pads on bus probably not configured (status=0x%x)\n",
status);
goto rd_exit;
}
if (status == 0 || (status & I2C_STAT_NACK)) {
i2c_error = 1;
goto rd_exit;
}
if (status & I2C_STAT_RRDY) {
*buffer++ = omap_i2c_read_reg(i2c_base, ip_rev,
OMAP_I2C_DATA_REG);
omap_i2c_write_reg(i2c_base, ip_rev,
I2C_STAT_RRDY, OMAP_I2C_STAT_REG);
}
if (status & I2C_STAT_ARDY) {
omap_i2c_write_reg(i2c_base, ip_rev,
I2C_STAT_ARDY, OMAP_I2C_STAT_REG);
break;
}
}
rd_exit:
flush_fifo(i2c_base, ip_rev);
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
return i2c_error;
}
/* i2c_write: Address (reg offset) may be 0, 1 or 2 bytes long. */
static int __omap24_i2c_write(void __iomem *i2c_base, int ip_rev, int waitdelay,
uchar chip, uint addr, int alen, uchar *buffer,
int len)
{
int i;
u16 status;
int i2c_error = 0;
int timeout = I2C_TIMEOUT;
if (alen < 0) {
puts("I2C write: addr len < 0\n");
return 1;
}
if (len < 0) {
puts("I2C write: data len < 0\n");
return 1;
}
if (buffer == NULL) {
puts("I2C write: NULL pointer passed\n");
return 1;
}
if (alen > 2) {
printf("I2C write: addr len %d not supported\n", alen);
return 1;
}
if (addr + len > (1 << 16)) {
printf("I2C write: address 0x%x + 0x%x out of range\n",
addr, len);
return 1;
}
#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
/*
* EEPROM chips that implement "address overflow" are ones
* like Catalyst 24WC04/08/16 which has 9/10/11 bits of
* address and the extra bits end up in the "chip address"
* bit slots. This makes a 24WC08 (1Kbyte) chip look like
* four 256 byte chips.
*
* Note that we consider the length of the address field to
* still be one byte because the extra address bits are
* hidden in the chip address.
*/
if (alen > 0)
chip |= ((addr >> (alen * 8)) &
CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
#endif
/* Wait until bus not busy */
if (wait_for_bb(i2c_base, ip_rev, waitdelay))
return 1;
/* Start address phase - will write regoffset + len bytes data */
omap_i2c_write_reg(i2c_base, ip_rev, alen + len, OMAP_I2C_CNT_REG);
/* Set slave address */
omap_i2c_write_reg(i2c_base, ip_rev, chip, OMAP_I2C_SA_REG);
/* Stop bit needed here */
omap_i2c_write_reg(i2c_base, ip_rev, I2C_CON_EN | I2C_CON_MST |
I2C_CON_STT | I2C_CON_TRX | I2C_CON_STP,
OMAP_I2C_CON_REG);
while (alen) {
/* Must write reg offset (one or two bytes) */
status = wait_for_event(i2c_base, ip_rev, waitdelay);
/* Try to identify bus that is not padconf'd for I2C */
if (status == I2C_STAT_XRDY) {
i2c_error = 2;
printf("i2c_write: pads on bus probably not configured (status=0x%x)\n",
status);
goto wr_exit;
}
if (status == 0 || (status & I2C_STAT_NACK)) {
i2c_error = 1;
printf("i2c_write: error waiting for addr ACK (status=0x%x)\n",
status);
goto wr_exit;
}
if (status & I2C_STAT_XRDY) {
alen--;
omap_i2c_write_reg(i2c_base, ip_rev,
(addr >> (8 * alen)) & 0xff,
OMAP_I2C_DATA_REG);
omap_i2c_write_reg(i2c_base, ip_rev,
I2C_STAT_XRDY, OMAP_I2C_STAT_REG);
} else {
i2c_error = 1;
printf("i2c_write: bus not ready for addr Tx (status=0x%x)\n",
status);
goto wr_exit;
}
}
/* Address phase is over, now write data */
for (i = 0; i < len; i++) {
status = wait_for_event(i2c_base, ip_rev, waitdelay);
if (status == 0 || (status & I2C_STAT_NACK)) {
i2c_error = 1;
printf("i2c_write: error waiting for data ACK (status=0x%x)\n",
status);
goto wr_exit;
}
if (status & I2C_STAT_XRDY) {
omap_i2c_write_reg(i2c_base, ip_rev,
buffer[i], OMAP_I2C_DATA_REG);
omap_i2c_write_reg(i2c_base, ip_rev,
I2C_STAT_XRDY, OMAP_I2C_STAT_REG);
} else {
i2c_error = 1;
printf("i2c_write: bus not ready for data Tx (i=%d)\n",
i);
goto wr_exit;
}
}
/*
* poll ARDY bit for making sure that last byte really has been
* transferred on the bus.
*/
do {
status = wait_for_event(i2c_base, ip_rev, waitdelay);
} while (!(status & I2C_STAT_ARDY) && timeout--);
if (timeout <= 0)
printf("i2c_write: timed out writig last byte!\n");
wr_exit:
flush_fifo(i2c_base, ip_rev);
omap_i2c_write_reg(i2c_base, ip_rev, 0xFFFF, OMAP_I2C_STAT_REG);
return i2c_error;
}
#if !CONFIG_IS_ENABLED(DM_I2C)
/*
* The legacy I2C functions. These need to get removed once
* all users of this driver are converted to DM.
*/
static void __iomem *omap24_get_base(struct i2c_adapter *adap)
{
switch (adap->hwadapnr) {
case 0:
return (void __iomem *)I2C_BASE1;
break;
case 1:
return (void __iomem *)I2C_BASE2;
break;
#if (CONFIG_SYS_I2C_BUS_MAX > 2)
case 2:
return (void __iomem *)I2C_BASE3;
break;
#if (CONFIG_SYS_I2C_BUS_MAX > 3)
case 3:
return (void __iomem *)I2C_BASE4;
break;
#if (CONFIG_SYS_I2C_BUS_MAX > 4)
case 4:
return (void __iomem *)I2C_BASE5;
break;
#endif
#endif
#endif
default:
printf("wrong hwadapnr: %d\n", adap->hwadapnr);
break;
}
return NULL;
}
static int omap24_get_ip_rev(void)
{
#ifdef CONFIG_OMAP34XX
return OMAP_I2C_REV_V1;
#else
return OMAP_I2C_REV_V2;
#endif
}
static int omap24_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
int alen, uchar *buffer, int len)
{
void __iomem *i2c_base = omap24_get_base(adap);
int ip_rev = omap24_get_ip_rev();
return __omap24_i2c_read(i2c_base, ip_rev, adap->waitdelay, chip, addr,
alen, buffer, len);
}
static int omap24_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
int alen, uchar *buffer, int len)
{
void __iomem *i2c_base = omap24_get_base(adap);
int ip_rev = omap24_get_ip_rev();
return __omap24_i2c_write(i2c_base, ip_rev, adap->waitdelay, chip, addr,
alen, buffer, len);
}
static uint omap24_i2c_setspeed(struct i2c_adapter *adap, uint speed)
{
void __iomem *i2c_base = omap24_get_base(adap);
int ip_rev = omap24_get_ip_rev();
int ret;
ret = __omap24_i2c_setspeed(i2c_base, ip_rev, speed, &adap->waitdelay);
if (ret) {
pr_err("%s: set i2c speed failed\n", __func__);
return ret;
}
adap->speed = speed;
return 0;
}
static void omap24_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
{
void __iomem *i2c_base = omap24_get_base(adap);
int ip_rev = omap24_get_ip_rev();
return __omap24_i2c_init(i2c_base, ip_rev, speed, slaveadd,
&adap->waitdelay);
}
static int omap24_i2c_probe(struct i2c_adapter *adap, uchar chip)
{
void __iomem *i2c_base = omap24_get_base(adap);
int ip_rev = omap24_get_ip_rev();
return __omap24_i2c_probe(i2c_base, ip_rev, adap->waitdelay, chip);
}
U_BOOT_I2C_ADAP_COMPLETE(omap24_0, omap24_i2c_init, omap24_i2c_probe,
omap24_i2c_read, omap24_i2c_write, omap24_i2c_setspeed,
CONFIG_SYS_I2C_SPEED,
CONFIG_SYS_I2C_SLAVE,
0)
U_BOOT_I2C_ADAP_COMPLETE(omap24_1, omap24_i2c_init, omap24_i2c_probe,
omap24_i2c_read, omap24_i2c_write, omap24_i2c_setspeed,
CONFIG_SYS_I2C_SPEED,
CONFIG_SYS_I2C_SLAVE,
1)
#if (CONFIG_SYS_I2C_BUS_MAX > 2)
U_BOOT_I2C_ADAP_COMPLETE(omap24_2, omap24_i2c_init, omap24_i2c_probe,
omap24_i2c_read, omap24_i2c_write, NULL,
CONFIG_SYS_I2C_SPEED,
CONFIG_SYS_I2C_SLAVE,
2)
#if (CONFIG_SYS_I2C_BUS_MAX > 3)
U_BOOT_I2C_ADAP_COMPLETE(omap24_3, omap24_i2c_init, omap24_i2c_probe,
omap24_i2c_read, omap24_i2c_write, NULL,
CONFIG_SYS_I2C_SPEED,
CONFIG_SYS_I2C_SLAVE,
3)
#if (CONFIG_SYS_I2C_BUS_MAX > 4)
U_BOOT_I2C_ADAP_COMPLETE(omap24_4, omap24_i2c_init, omap24_i2c_probe,
omap24_i2c_read, omap24_i2c_write, NULL,
CONFIG_SYS_I2C_SPEED,
CONFIG_SYS_I2C_SLAVE,
4)
#endif
#endif
#endif
#else /* CONFIG_DM_I2C */
static int omap_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
{
struct omap_i2c *priv = dev_get_priv(bus);
int ret;
debug("i2c_xfer: %d messages\n", nmsgs);
for (; nmsgs > 0; nmsgs--, msg++) {
debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
if (msg->flags & I2C_M_RD) {
ret = __omap24_i2c_read(priv->regs, priv->ip_rev,
priv->waitdelay,
msg->addr, 0, 0, msg->buf,
msg->len);
} else {
ret = __omap24_i2c_write(priv->regs, priv->ip_rev,
priv->waitdelay,
msg->addr, 0, 0, msg->buf,
msg->len);
}
if (ret) {
debug("i2c_write: error sending\n");
return -EREMOTEIO;
}
}
return 0;
}
static int omap_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
{
struct omap_i2c *priv = dev_get_priv(bus);
priv->speed = speed;
return __omap24_i2c_setspeed(priv->regs, priv->ip_rev, speed,
&priv->waitdelay);
}
static int omap_i2c_probe_chip(struct udevice *bus, uint chip_addr,
uint chip_flags)
{
struct omap_i2c *priv = dev_get_priv(bus);
return __omap24_i2c_probe(priv->regs, priv->ip_rev, priv->waitdelay,
chip_addr);
}
static int omap_i2c_probe(struct udevice *bus)
{
struct omap_i2c *priv = dev_get_priv(bus);
struct omap_i2c_plat *plat = dev_get_plat(bus);
priv->speed = plat->speed;
priv->regs = map_physmem(plat->base, sizeof(void *),
MAP_NOCACHE);
priv->ip_rev = plat->ip_rev;
__omap24_i2c_init(priv->regs, priv->ip_rev, priv->speed, 0,
&priv->waitdelay);
return 0;
}
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
static int omap_i2c_of_to_plat(struct udevice *bus)
{
struct omap_i2c_plat *plat = dev_get_plat(bus);
plat->base = dev_read_addr(bus);
plat->speed = dev_read_u32_default(bus, "clock-frequency",
I2C_SPEED_STANDARD_RATE);
plat->ip_rev = dev_get_driver_data(bus);
return 0;
}
static const struct udevice_id omap_i2c_ids[] = {
{ .compatible = "ti,omap3-i2c", .data = OMAP_I2C_REV_V1 },
{ .compatible = "ti,omap4-i2c", .data = OMAP_I2C_REV_V2 },
{ }
};
#endif
static const struct dm_i2c_ops omap_i2c_ops = {
.xfer = omap_i2c_xfer,
.probe_chip = omap_i2c_probe_chip,
.set_bus_speed = omap_i2c_set_bus_speed,
};
U_BOOT_DRIVER(i2c_omap) = {
.name = "i2c_omap",
.id = UCLASS_I2C,
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
.of_match = omap_i2c_ids,
.of_to_plat = omap_i2c_of_to_plat,
.plat_auto = sizeof(struct omap_i2c_plat),
#endif
.probe = omap_i2c_probe,
.priv_auto = sizeof(struct omap_i2c),
.ops = &omap_i2c_ops,
#if !CONFIG_IS_ENABLED(OF_CONTROL)
.flags = DM_FLAG_PRE_RELOC,
#endif
};
#endif /* CONFIG_DM_I2C */
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