mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-18 16:08:53 +09:00
![Alexey Brodkin](/assets/img/avatar_default.png)
As soon as all boards have their CONFIG_SYS_I2C_BASE defined in configuration files instead of "asm/arch/hardware.h" it's safe to remove the inclusion in question and make driver platform-independent. Cc: Tom Rini <trini@ti.com> Cc: Heiko Schocher <hs@denx.de> Cc: Stefan Roese <sr@denx.de> Cc: Vipin Kumar <vipin.kumar@st.com> Cc: Armando Visconti <armando.visconti@st.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
437 lines
9.4 KiB
C
437 lines
9.4 KiB
C
/*
|
|
* (C) Copyright 2009
|
|
* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include "designware_i2c.h"
|
|
|
|
#ifdef CONFIG_I2C_MULTI_BUS
|
|
static unsigned int bus_initialized[CONFIG_SYS_I2C_BUS_MAX];
|
|
static unsigned int current_bus = 0;
|
|
#endif
|
|
|
|
static struct i2c_regs *i2c_regs_p =
|
|
(struct i2c_regs *)CONFIG_SYS_I2C_BASE;
|
|
|
|
/*
|
|
* set_speed - Set the i2c speed mode (standard, high, fast)
|
|
* @i2c_spd: required i2c speed mode
|
|
*
|
|
* Set the i2c speed mode (standard, high, fast)
|
|
*/
|
|
static void set_speed(int i2c_spd)
|
|
{
|
|
unsigned int cntl;
|
|
unsigned int hcnt, lcnt;
|
|
unsigned int enbl;
|
|
|
|
/* to set speed cltr must be disabled */
|
|
enbl = readl(&i2c_regs_p->ic_enable);
|
|
enbl &= ~IC_ENABLE_0B;
|
|
writel(enbl, &i2c_regs_p->ic_enable);
|
|
|
|
cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK));
|
|
|
|
switch (i2c_spd) {
|
|
case IC_SPEED_MODE_MAX:
|
|
cntl |= IC_CON_SPD_HS;
|
|
hcnt = (IC_CLK * MIN_HS_SCL_HIGHTIME) / NANO_TO_MICRO;
|
|
writel(hcnt, &i2c_regs_p->ic_hs_scl_hcnt);
|
|
lcnt = (IC_CLK * MIN_HS_SCL_LOWTIME) / NANO_TO_MICRO;
|
|
writel(lcnt, &i2c_regs_p->ic_hs_scl_lcnt);
|
|
break;
|
|
|
|
case IC_SPEED_MODE_STANDARD:
|
|
cntl |= IC_CON_SPD_SS;
|
|
hcnt = (IC_CLK * MIN_SS_SCL_HIGHTIME) / NANO_TO_MICRO;
|
|
writel(hcnt, &i2c_regs_p->ic_ss_scl_hcnt);
|
|
lcnt = (IC_CLK * MIN_SS_SCL_LOWTIME) / NANO_TO_MICRO;
|
|
writel(lcnt, &i2c_regs_p->ic_ss_scl_lcnt);
|
|
break;
|
|
|
|
case IC_SPEED_MODE_FAST:
|
|
default:
|
|
cntl |= IC_CON_SPD_FS;
|
|
hcnt = (IC_CLK * MIN_FS_SCL_HIGHTIME) / NANO_TO_MICRO;
|
|
writel(hcnt, &i2c_regs_p->ic_fs_scl_hcnt);
|
|
lcnt = (IC_CLK * MIN_FS_SCL_LOWTIME) / NANO_TO_MICRO;
|
|
writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt);
|
|
break;
|
|
}
|
|
|
|
writel(cntl, &i2c_regs_p->ic_con);
|
|
|
|
/* Enable back i2c now speed set */
|
|
enbl |= IC_ENABLE_0B;
|
|
writel(enbl, &i2c_regs_p->ic_enable);
|
|
}
|
|
|
|
/*
|
|
* i2c_set_bus_speed - Set the i2c speed
|
|
* @speed: required i2c speed
|
|
*
|
|
* Set the i2c speed.
|
|
*/
|
|
int i2c_set_bus_speed(int speed)
|
|
{
|
|
if (speed >= I2C_MAX_SPEED)
|
|
set_speed(IC_SPEED_MODE_MAX);
|
|
else if (speed >= I2C_FAST_SPEED)
|
|
set_speed(IC_SPEED_MODE_FAST);
|
|
else
|
|
set_speed(IC_SPEED_MODE_STANDARD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* i2c_get_bus_speed - Gets the i2c speed
|
|
*
|
|
* Gets the i2c speed.
|
|
*/
|
|
int i2c_get_bus_speed(void)
|
|
{
|
|
u32 cntl;
|
|
|
|
cntl = (readl(&i2c_regs_p->ic_con) & IC_CON_SPD_MSK);
|
|
|
|
if (cntl == IC_CON_SPD_HS)
|
|
return I2C_MAX_SPEED;
|
|
else if (cntl == IC_CON_SPD_FS)
|
|
return I2C_FAST_SPEED;
|
|
else if (cntl == IC_CON_SPD_SS)
|
|
return I2C_STANDARD_SPEED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* i2c_init - Init function
|
|
* @speed: required i2c speed
|
|
* @slaveadd: slave address for the device
|
|
*
|
|
* Initialization function.
|
|
*/
|
|
void i2c_init(int speed, int slaveadd)
|
|
{
|
|
unsigned int enbl;
|
|
|
|
/* Disable i2c */
|
|
enbl = readl(&i2c_regs_p->ic_enable);
|
|
enbl &= ~IC_ENABLE_0B;
|
|
writel(enbl, &i2c_regs_p->ic_enable);
|
|
|
|
writel((IC_CON_SD | IC_CON_SPD_FS | IC_CON_MM), &i2c_regs_p->ic_con);
|
|
writel(IC_RX_TL, &i2c_regs_p->ic_rx_tl);
|
|
writel(IC_TX_TL, &i2c_regs_p->ic_tx_tl);
|
|
i2c_set_bus_speed(speed);
|
|
writel(IC_STOP_DET, &i2c_regs_p->ic_intr_mask);
|
|
writel(slaveadd, &i2c_regs_p->ic_sar);
|
|
|
|
/* Enable i2c */
|
|
enbl = readl(&i2c_regs_p->ic_enable);
|
|
enbl |= IC_ENABLE_0B;
|
|
writel(enbl, &i2c_regs_p->ic_enable);
|
|
|
|
#ifdef CONFIG_I2C_MULTI_BUS
|
|
bus_initialized[current_bus] = 1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* i2c_setaddress - Sets the target slave address
|
|
* @i2c_addr: target i2c address
|
|
*
|
|
* Sets the target slave address.
|
|
*/
|
|
static void i2c_setaddress(unsigned int i2c_addr)
|
|
{
|
|
unsigned int enbl;
|
|
|
|
/* Disable i2c */
|
|
enbl = readl(&i2c_regs_p->ic_enable);
|
|
enbl &= ~IC_ENABLE_0B;
|
|
writel(enbl, &i2c_regs_p->ic_enable);
|
|
|
|
writel(i2c_addr, &i2c_regs_p->ic_tar);
|
|
|
|
/* Enable i2c */
|
|
enbl = readl(&i2c_regs_p->ic_enable);
|
|
enbl |= IC_ENABLE_0B;
|
|
writel(enbl, &i2c_regs_p->ic_enable);
|
|
}
|
|
|
|
/*
|
|
* i2c_flush_rxfifo - Flushes the i2c RX FIFO
|
|
*
|
|
* Flushes the i2c RX FIFO
|
|
*/
|
|
static void i2c_flush_rxfifo(void)
|
|
{
|
|
while (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE)
|
|
readl(&i2c_regs_p->ic_cmd_data);
|
|
}
|
|
|
|
/*
|
|
* i2c_wait_for_bb - Waits for bus busy
|
|
*
|
|
* Waits for bus busy
|
|
*/
|
|
static int i2c_wait_for_bb(void)
|
|
{
|
|
unsigned long start_time_bb = get_timer(0);
|
|
|
|
while ((readl(&i2c_regs_p->ic_status) & IC_STATUS_MA) ||
|
|
!(readl(&i2c_regs_p->ic_status) & IC_STATUS_TFE)) {
|
|
|
|
/* Evaluate timeout */
|
|
if (get_timer(start_time_bb) > (unsigned long)(I2C_BYTE_TO_BB))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i2c_xfer_init(uchar chip, uint addr, int alen)
|
|
{
|
|
if (i2c_wait_for_bb())
|
|
return 1;
|
|
|
|
i2c_setaddress(chip);
|
|
while (alen) {
|
|
alen--;
|
|
/* high byte address going out first */
|
|
writel((addr >> (alen * 8)) & 0xff,
|
|
&i2c_regs_p->ic_cmd_data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int i2c_xfer_finish(void)
|
|
{
|
|
ulong start_stop_det = get_timer(0);
|
|
|
|
while (1) {
|
|
if ((readl(&i2c_regs_p->ic_raw_intr_stat) & IC_STOP_DET)) {
|
|
readl(&i2c_regs_p->ic_clr_stop_det);
|
|
break;
|
|
} else if (get_timer(start_stop_det) > I2C_STOPDET_TO) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i2c_wait_for_bb()) {
|
|
printf("Timed out waiting for bus\n");
|
|
return 1;
|
|
}
|
|
|
|
i2c_flush_rxfifo();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* i2c_read - Read from i2c memory
|
|
* @chip: target i2c address
|
|
* @addr: address to read from
|
|
* @alen:
|
|
* @buffer: buffer for read data
|
|
* @len: no of bytes to be read
|
|
*
|
|
* Read from i2c memory.
|
|
*/
|
|
int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
|
|
{
|
|
unsigned long start_time_rx;
|
|
|
|
#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.
|
|
*/
|
|
chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
|
|
addr &= ~(CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW << (alen * 8));
|
|
|
|
debug("%s: fix addr_overflow: chip %02x addr %02x\n", __func__, chip,
|
|
addr);
|
|
#endif
|
|
|
|
if (i2c_xfer_init(chip, addr, alen))
|
|
return 1;
|
|
|
|
start_time_rx = get_timer(0);
|
|
while (len) {
|
|
if (len == 1)
|
|
writel(IC_CMD | IC_STOP, &i2c_regs_p->ic_cmd_data);
|
|
else
|
|
writel(IC_CMD, &i2c_regs_p->ic_cmd_data);
|
|
|
|
if (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE) {
|
|
*buffer++ = (uchar)readl(&i2c_regs_p->ic_cmd_data);
|
|
len--;
|
|
start_time_rx = get_timer(0);
|
|
|
|
} else if (get_timer(start_time_rx) > I2C_BYTE_TO) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return i2c_xfer_finish();
|
|
}
|
|
|
|
/*
|
|
* i2c_write - Write to i2c memory
|
|
* @chip: target i2c address
|
|
* @addr: address to read from
|
|
* @alen:
|
|
* @buffer: buffer for read data
|
|
* @len: no of bytes to be read
|
|
*
|
|
* Write to i2c memory.
|
|
*/
|
|
int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
|
|
{
|
|
int nb = len;
|
|
unsigned long start_time_tx;
|
|
|
|
#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.
|
|
*/
|
|
chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
|
|
addr &= ~(CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW << (alen * 8));
|
|
|
|
debug("%s: fix addr_overflow: chip %02x addr %02x\n", __func__, chip,
|
|
addr);
|
|
#endif
|
|
|
|
if (i2c_xfer_init(chip, addr, alen))
|
|
return 1;
|
|
|
|
start_time_tx = get_timer(0);
|
|
while (len) {
|
|
if (readl(&i2c_regs_p->ic_status) & IC_STATUS_TFNF) {
|
|
if (--len == 0)
|
|
writel(*buffer | IC_STOP, &i2c_regs_p->ic_cmd_data);
|
|
else
|
|
writel(*buffer, &i2c_regs_p->ic_cmd_data);
|
|
buffer++;
|
|
start_time_tx = get_timer(0);
|
|
|
|
} else if (get_timer(start_time_tx) > (nb * I2C_BYTE_TO)) {
|
|
printf("Timed out. i2c write Failed\n");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return i2c_xfer_finish();
|
|
}
|
|
|
|
/*
|
|
* i2c_probe - Probe the i2c chip
|
|
*/
|
|
int i2c_probe(uchar chip)
|
|
{
|
|
u32 tmp;
|
|
int ret;
|
|
|
|
/*
|
|
* Try to read the first location of the chip.
|
|
*/
|
|
ret = i2c_read(chip, 0, 1, (uchar *)&tmp, 1);
|
|
if (ret)
|
|
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_I2C_MULTI_BUS
|
|
int i2c_set_bus_num(unsigned int bus)
|
|
{
|
|
switch (bus) {
|
|
case 0:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE;
|
|
break;
|
|
#ifdef CONFIG_SYS_I2C_BASE1
|
|
case 1:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE1;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE2
|
|
case 2:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE2;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE3
|
|
case 3:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE3;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE4
|
|
case 4:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE4;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE5
|
|
case 5:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE5;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE6
|
|
case 6:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE6;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE7
|
|
case 7:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE7;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE8
|
|
case 8:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE8;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SYS_I2C_BASE9
|
|
case 9:
|
|
i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE9;
|
|
break;
|
|
#endif
|
|
default:
|
|
printf("Bad bus: %d\n", bus);
|
|
return -1;
|
|
}
|
|
|
|
current_bus = bus;
|
|
|
|
if (!bus_initialized[current_bus])
|
|
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int i2c_get_bus_num(void)
|
|
{
|
|
return current_bus;
|
|
}
|
|
#endif
|