upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
495 lines
12 KiB
495 lines
12 KiB
/*
|
|
* Copyright 2006,2009 Freescale Semiconductor, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* Version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
|
|
#ifdef CONFIG_HARD_I2C
|
|
|
|
#include <command.h>
|
|
#include <i2c.h> /* Functional interface */
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/fsl_i2c.h> /* HW definitions */
|
|
|
|
/* The maximum number of microseconds we will wait until another master has
|
|
* released the bus. If not defined in the board header file, then use a
|
|
* generic value.
|
|
*/
|
|
#ifndef CONFIG_I2C_MBB_TIMEOUT
|
|
#define CONFIG_I2C_MBB_TIMEOUT 100000
|
|
#endif
|
|
|
|
/* The maximum number of microseconds we will wait for a read or write
|
|
* operation to complete. If not defined in the board header file, then use a
|
|
* generic value.
|
|
*/
|
|
#ifndef CONFIG_I2C_TIMEOUT
|
|
#define CONFIG_I2C_TIMEOUT 10000
|
|
#endif
|
|
|
|
#define I2C_READ_BIT 1
|
|
#define I2C_WRITE_BIT 0
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* Initialize the bus pointer to whatever one the SPD EEPROM is on.
|
|
* Default is bus 0. This is necessary because the DDR initialization
|
|
* runs from ROM, and we can't switch buses because we can't modify
|
|
* the global variables.
|
|
*/
|
|
#ifndef CONFIG_SYS_SPD_BUS_NUM
|
|
#define CONFIG_SYS_SPD_BUS_NUM 0
|
|
#endif
|
|
static unsigned int i2c_bus_num __attribute__ ((section (".data"))) = CONFIG_SYS_SPD_BUS_NUM;
|
|
#if defined(CONFIG_I2C_MUX)
|
|
static unsigned int i2c_bus_num_mux __attribute__ ((section ("data"))) = 0;
|
|
#endif
|
|
|
|
static unsigned int i2c_bus_speed[2] = {CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SPEED};
|
|
|
|
static const struct fsl_i2c *i2c_dev[2] = {
|
|
(struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET),
|
|
#ifdef CONFIG_SYS_I2C2_OFFSET
|
|
(struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C2_OFFSET)
|
|
#endif
|
|
};
|
|
|
|
/* I2C speed map for a DFSR value of 1 */
|
|
|
|
/*
|
|
* Map I2C frequency dividers to FDR and DFSR values
|
|
*
|
|
* This structure is used to define the elements of a table that maps I2C
|
|
* frequency divider (I2C clock rate divided by I2C bus speed) to a value to be
|
|
* programmed into the Frequency Divider Ratio (FDR) and Digital Filter
|
|
* Sampling Rate (DFSR) registers.
|
|
*
|
|
* The actual table should be defined in the board file, and it must be called
|
|
* fsl_i2c_speed_map[].
|
|
*
|
|
* The last entry of the table must have a value of {-1, X}, where X is same
|
|
* FDR/DFSR values as the second-to-last entry. This guarantees that any
|
|
* search through the array will always find a match.
|
|
*
|
|
* The values of the divider must be in increasing numerical order, i.e.
|
|
* fsl_i2c_speed_map[x+1].divider > fsl_i2c_speed_map[x].divider.
|
|
*
|
|
* For this table, the values are based on a value of 1 for the DFSR
|
|
* register. See the application note AN2919 "Determining the I2C Frequency
|
|
* Divider Ratio for SCL"
|
|
*
|
|
* ColdFire I2C frequency dividers for FDR values are different from
|
|
* PowerPC. The protocol to use the I2C module is still the same.
|
|
* A different table is defined and are based on MCF5xxx user manual.
|
|
*
|
|
*/
|
|
static const struct {
|
|
unsigned short divider;
|
|
u8 fdr;
|
|
} fsl_i2c_speed_map[] = {
|
|
#ifdef __M68K__
|
|
{20, 32}, {22, 33}, {24, 34}, {26, 35},
|
|
{28, 0}, {28, 36}, {30, 1}, {32, 37},
|
|
{34, 2}, {36, 38}, {40, 3}, {40, 39},
|
|
{44, 4}, {48, 5}, {48, 40}, {56, 6},
|
|
{56, 41}, {64, 42}, {68, 7}, {72, 43},
|
|
{80, 8}, {80, 44}, {88, 9}, {96, 41},
|
|
{104, 10}, {112, 42}, {128, 11}, {128, 43},
|
|
{144, 12}, {160, 13}, {160, 48}, {192, 14},
|
|
{192, 49}, {224, 50}, {240, 15}, {256, 51},
|
|
{288, 16}, {320, 17}, {320, 52}, {384, 18},
|
|
{384, 53}, {448, 54}, {480, 19}, {512, 55},
|
|
{576, 20}, {640, 21}, {640, 56}, {768, 22},
|
|
{768, 57}, {960, 23}, {896, 58}, {1024, 59},
|
|
{1152, 24}, {1280, 25}, {1280, 60}, {1536, 26},
|
|
{1536, 61}, {1792, 62}, {1920, 27}, {2048, 63},
|
|
{2304, 28}, {2560, 29}, {3072, 30}, {3840, 31},
|
|
{-1, 31}
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* Set the I2C bus speed for a given I2C device
|
|
*
|
|
* @param dev: the I2C device
|
|
* @i2c_clk: I2C bus clock frequency
|
|
* @speed: the desired speed of the bus
|
|
*
|
|
* The I2C device must be stopped before calling this function.
|
|
*
|
|
* The return value is the actual bus speed that is set.
|
|
*/
|
|
static unsigned int set_i2c_bus_speed(const struct fsl_i2c *dev,
|
|
unsigned int i2c_clk, unsigned int speed)
|
|
{
|
|
unsigned short divider = min(i2c_clk / speed, (unsigned short) -1);
|
|
|
|
/*
|
|
* We want to choose an FDR/DFSR that generates an I2C bus speed that
|
|
* is equal to or lower than the requested speed. That means that we
|
|
* want the first divider that is equal to or greater than the
|
|
* calculated divider.
|
|
*/
|
|
#ifdef __PPC__
|
|
u8 dfsr, fdr = 0x31; /* Default if no FDR found */
|
|
/* a, b and dfsr matches identifiers A,B and C respectively in AN2919 */
|
|
unsigned short a, b, ga, gb;
|
|
unsigned long c_div, est_div;
|
|
|
|
#ifdef CONFIG_FSL_I2C_CUSTOM_DFSR
|
|
dfsr = CONFIG_FSL_I2C_CUSTOM_DFSR;
|
|
#else
|
|
/* Condition 1: dfsr <= 50/T */
|
|
dfsr = (5 * (i2c_clk / 1000)) / 100000;
|
|
#endif
|
|
#ifdef CONFIG_FSL_I2C_CUSTOM_FDR
|
|
fdr = CONFIG_FSL_I2C_CUSTOM_FDR;
|
|
speed = i2c_clk / divider; /* Fake something */
|
|
#else
|
|
debug("Requested speed:%d, i2c_clk:%d\n", speed, i2c_clk);
|
|
if (!dfsr)
|
|
dfsr = 1;
|
|
|
|
est_div = ~0;
|
|
for (ga = 0x4, a = 10; a <= 30; ga++, a += 2) {
|
|
for (gb = 0; gb < 8; gb++) {
|
|
b = 16 << gb;
|
|
c_div = b * (a + ((3*dfsr)/b)*2);
|
|
if ((c_div > divider) && (c_div < est_div)) {
|
|
unsigned short bin_gb, bin_ga;
|
|
|
|
est_div = c_div;
|
|
bin_gb = gb << 2;
|
|
bin_ga = (ga & 0x3) | ((ga & 0x4) << 3);
|
|
fdr = bin_gb | bin_ga;
|
|
speed = i2c_clk / est_div;
|
|
debug("FDR:0x%.2x, div:%ld, ga:0x%x, gb:0x%x, "
|
|
"a:%d, b:%d, speed:%d\n",
|
|
fdr, est_div, ga, gb, a, b, speed);
|
|
/* Condition 2 not accounted for */
|
|
debug("Tr <= %d ns\n",
|
|
(b - 3 * dfsr) * 1000000 /
|
|
(i2c_clk / 1000));
|
|
}
|
|
}
|
|
if (a == 20)
|
|
a += 2;
|
|
if (a == 24)
|
|
a += 4;
|
|
}
|
|
debug("divider:%d, est_div:%ld, DFSR:%d\n", divider, est_div, dfsr);
|
|
debug("FDR:0x%.2x, speed:%d\n", fdr, speed);
|
|
#endif
|
|
writeb(dfsr, &dev->dfsrr); /* set default filter */
|
|
writeb(fdr, &dev->fdr); /* set bus speed */
|
|
#else
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(fsl_i2c_speed_map); i++)
|
|
if (fsl_i2c_speed_map[i].divider >= divider) {
|
|
u8 fdr;
|
|
|
|
fdr = fsl_i2c_speed_map[i].fdr;
|
|
speed = i2c_clk / fsl_i2c_speed_map[i].divider;
|
|
writeb(fdr, &dev->fdr); /* set bus speed */
|
|
|
|
break;
|
|
}
|
|
#endif
|
|
return speed;
|
|
}
|
|
|
|
unsigned int get_i2c_clock(int bus)
|
|
{
|
|
if (bus)
|
|
return gd->i2c2_clk; /* I2C2 clock */
|
|
else
|
|
return gd->i2c1_clk; /* I2C1 clock */
|
|
}
|
|
|
|
void
|
|
i2c_init(int speed, int slaveadd)
|
|
{
|
|
struct fsl_i2c *dev;
|
|
unsigned int temp;
|
|
int bus_num, i;
|
|
|
|
#ifdef CONFIG_SYS_I2C_INIT_BOARD
|
|
/* Call board specific i2c bus reset routine before accessing the
|
|
* environment, which might be in a chip on that bus. For details
|
|
* about this problem see doc/I2C_Edge_Conditions.
|
|
*/
|
|
i2c_init_board();
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C2_OFFSET
|
|
bus_num = 2;
|
|
#else
|
|
bus_num = 1;
|
|
#endif
|
|
for (i = 0; i < bus_num; i++) {
|
|
dev = i2c_dev[i];
|
|
|
|
writeb(0, &dev->cr); /* stop I2C controller */
|
|
udelay(5); /* let it shutdown in peace */
|
|
temp = set_i2c_bus_speed(dev, get_i2c_clock(i), speed);
|
|
if (gd->flags & GD_FLG_RELOC)
|
|
i2c_bus_speed[i] = temp;
|
|
writeb(slaveadd << 1, &dev->adr);/* write slave address */
|
|
writeb(0x0, &dev->sr); /* clear status register */
|
|
writeb(I2C_CR_MEN, &dev->cr); /* start I2C controller */
|
|
}
|
|
|
|
#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
|
|
/* Call board specific i2c bus reset routine AFTER the bus has been
|
|
* initialized. Use either this callpoint or i2c_init_board;
|
|
* which is called before i2c_init operations.
|
|
* For details about this problem see doc/I2C_Edge_Conditions.
|
|
*/
|
|
i2c_board_late_init();
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
i2c_wait4bus(void)
|
|
{
|
|
unsigned long long timeval = get_ticks();
|
|
const unsigned long long timeout = usec2ticks(CONFIG_I2C_MBB_TIMEOUT);
|
|
|
|
while (readb(&i2c_dev[i2c_bus_num]->sr) & I2C_SR_MBB) {
|
|
if ((get_ticks() - timeval) > timeout)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ int
|
|
i2c_wait(int write)
|
|
{
|
|
u32 csr;
|
|
unsigned long long timeval = get_ticks();
|
|
const unsigned long long timeout = usec2ticks(CONFIG_I2C_TIMEOUT);
|
|
|
|
do {
|
|
csr = readb(&i2c_dev[i2c_bus_num]->sr);
|
|
if (!(csr & I2C_SR_MIF))
|
|
continue;
|
|
/* Read again to allow register to stabilise */
|
|
csr = readb(&i2c_dev[i2c_bus_num]->sr);
|
|
|
|
writeb(0x0, &i2c_dev[i2c_bus_num]->sr);
|
|
|
|
if (csr & I2C_SR_MAL) {
|
|
debug("i2c_wait: MAL\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!(csr & I2C_SR_MCF)) {
|
|
debug("i2c_wait: unfinished\n");
|
|
return -1;
|
|
}
|
|
|
|
if (write == I2C_WRITE_BIT && (csr & I2C_SR_RXAK)) {
|
|
debug("i2c_wait: No RXACK\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
} while ((get_ticks() - timeval) < timeout);
|
|
|
|
debug("i2c_wait: timed out\n");
|
|
return -1;
|
|
}
|
|
|
|
static __inline__ int
|
|
i2c_write_addr (u8 dev, u8 dir, int rsta)
|
|
{
|
|
writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX
|
|
| (rsta ? I2C_CR_RSTA : 0),
|
|
&i2c_dev[i2c_bus_num]->cr);
|
|
|
|
writeb((dev << 1) | dir, &i2c_dev[i2c_bus_num]->dr);
|
|
|
|
if (i2c_wait(I2C_WRITE_BIT) < 0)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static __inline__ int
|
|
__i2c_write(u8 *data, int length)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
writeb(data[i], &i2c_dev[i2c_bus_num]->dr);
|
|
|
|
if (i2c_wait(I2C_WRITE_BIT) < 0)
|
|
break;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
static __inline__ int
|
|
__i2c_read(u8 *data, int length)
|
|
{
|
|
int i;
|
|
|
|
writeb(I2C_CR_MEN | I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0),
|
|
&i2c_dev[i2c_bus_num]->cr);
|
|
|
|
/* dummy read */
|
|
readb(&i2c_dev[i2c_bus_num]->dr);
|
|
|
|
for (i = 0; i < length; i++) {
|
|
if (i2c_wait(I2C_READ_BIT) < 0)
|
|
break;
|
|
|
|
/* Generate ack on last next to last byte */
|
|
if (i == length - 2)
|
|
writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_TXAK,
|
|
&i2c_dev[i2c_bus_num]->cr);
|
|
|
|
/* Do not generate stop on last byte */
|
|
if (i == length - 1)
|
|
writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX,
|
|
&i2c_dev[i2c_bus_num]->cr);
|
|
|
|
data[i] = readb(&i2c_dev[i2c_bus_num]->dr);
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
int
|
|
i2c_read(u8 dev, uint addr, int alen, u8 *data, int length)
|
|
{
|
|
int i = -1; /* signal error */
|
|
u8 *a = (u8*)&addr;
|
|
|
|
if (i2c_wait4bus() >= 0
|
|
&& i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0
|
|
&& __i2c_write(&a[4 - alen], alen) == alen)
|
|
i = 0; /* No error so far */
|
|
|
|
if (length
|
|
&& i2c_write_addr(dev, I2C_READ_BIT, 1) != 0)
|
|
i = __i2c_read(data, length);
|
|
|
|
writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);
|
|
|
|
if (i2c_wait4bus()) /* Wait until STOP */
|
|
debug("i2c_read: wait4bus timed out\n");
|
|
|
|
if (i == length)
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
i2c_write(u8 dev, uint addr, int alen, u8 *data, int length)
|
|
{
|
|
int i = -1; /* signal error */
|
|
u8 *a = (u8*)&addr;
|
|
|
|
if (i2c_wait4bus() >= 0
|
|
&& i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0
|
|
&& __i2c_write(&a[4 - alen], alen) == alen) {
|
|
i = __i2c_write(data, length);
|
|
}
|
|
|
|
writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);
|
|
if (i2c_wait4bus()) /* Wait until STOP */
|
|
debug("i2c_write: wait4bus timed out\n");
|
|
|
|
if (i == length)
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
i2c_probe(uchar chip)
|
|
{
|
|
/* For unknow reason the controller will ACK when
|
|
* probing for a slave with the same address, so skip
|
|
* it.
|
|
*/
|
|
if (chip == (readb(&i2c_dev[i2c_bus_num]->adr) >> 1))
|
|
return -1;
|
|
|
|
return i2c_read(chip, 0, 0, NULL, 0);
|
|
}
|
|
|
|
int i2c_set_bus_num(unsigned int bus)
|
|
{
|
|
#if defined(CONFIG_I2C_MUX)
|
|
if (bus < CONFIG_SYS_MAX_I2C_BUS) {
|
|
i2c_bus_num = bus;
|
|
} else {
|
|
int ret;
|
|
|
|
ret = i2x_mux_select_mux(bus);
|
|
if (ret)
|
|
return ret;
|
|
i2c_bus_num = 0;
|
|
}
|
|
i2c_bus_num_mux = bus;
|
|
#else
|
|
#ifdef CONFIG_SYS_I2C2_OFFSET
|
|
if (bus > 1) {
|
|
#else
|
|
if (bus > 0) {
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
i2c_bus_num = bus;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int i2c_set_bus_speed(unsigned int speed)
|
|
{
|
|
unsigned int i2c_clk = (i2c_bus_num == 1) ? gd->i2c2_clk : gd->i2c1_clk;
|
|
|
|
writeb(0, &i2c_dev[i2c_bus_num]->cr); /* stop controller */
|
|
i2c_bus_speed[i2c_bus_num] =
|
|
set_i2c_bus_speed(i2c_dev[i2c_bus_num], i2c_clk, speed);
|
|
writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr); /* start controller */
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned int i2c_get_bus_num(void)
|
|
{
|
|
#if defined(CONFIG_I2C_MUX)
|
|
return i2c_bus_num_mux;
|
|
#else
|
|
return i2c_bus_num;
|
|
#endif
|
|
}
|
|
|
|
unsigned int i2c_get_bus_speed(void)
|
|
{
|
|
return i2c_bus_speed[i2c_bus_num];
|
|
}
|
|
|
|
#endif /* CONFIG_HARD_I2C */
|
|
|