+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009
* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <i2c.h>
+#include <pci.h>
+#include <reset.h>
#include <asm/io.h>
-#include <asm/arch/hardware.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;
+#ifdef CONFIG_SYS_I2C_DW_ENABLE_STATUS_UNSUPPORTED
+static int dw_i2c_enable(struct i2c_regs *i2c_base, bool enable)
+{
+ u32 ena = enable ? IC_ENABLE_0B : 0;
+
+ writel(ena, &i2c_base->ic_enable);
+
+ return 0;
+}
+#else
+static int dw_i2c_enable(struct i2c_regs *i2c_base, bool enable)
+{
+ u32 ena = enable ? IC_ENABLE_0B : 0;
+ int timeout = 100;
+
+ do {
+ writel(ena, &i2c_base->ic_enable);
+ if ((readl(&i2c_base->ic_enable_status) & IC_ENABLE_0B) == ena)
+ return 0;
+
+ /*
+ * Wait 10 times the signaling period of the highest I2C
+ * transfer supported by the driver (for 400KHz this is
+ * 25us) as described in the DesignWare I2C databook.
+ */
+ udelay(25);
+ } while (timeout--);
+ printf("timeout in %sabling I2C adapter\n", enable ? "en" : "dis");
+
+ return -ETIMEDOUT;
+}
#endif
-static struct i2c_regs *i2c_regs_p =
- (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
+/* High and low times in different speed modes (in ns) */
+enum {
+ /* SDA Hold Time */
+ DEFAULT_SDA_HOLD_TIME = 300,
+};
-/*
- * set_speed - Set the i2c speed mode (standard, high, fast)
- * @i2c_spd: required i2c speed mode
+/**
+ * calc_counts() - Convert a period to a number of IC clk cycles
*
- * Set the i2c speed mode (standard, high, fast)
+ * @ic_clk: Input clock in Hz
+ * @period_ns: Period to represent, in ns
+ * @return calculated count
*/
-static void set_speed(int i2c_spd)
+static uint calc_counts(uint ic_clk, uint period_ns)
{
- unsigned int cntl;
- unsigned int hcnt, lcnt;
- unsigned int enbl;
+ return DIV_ROUND_UP(ic_clk / 1000 * period_ns, NANO_TO_KILO);
+}
- /* 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);
+/**
+ * struct i2c_mode_info - Information about an I2C speed mode
+ *
+ * Each speed mode has its own characteristics. This struct holds these to aid
+ * calculations in dw_i2c_calc_timing().
+ *
+ * @speed: Speed in Hz
+ * @min_scl_lowtime_ns: Minimum value for SCL low period in ns
+ * @min_scl_hightime_ns: Minimum value for SCL high period in ns
+ * @def_rise_time_ns: Default rise time in ns
+ * @def_fall_time_ns: Default fall time in ns
+ */
+struct i2c_mode_info {
+ int speed;
+ int min_scl_hightime_ns;
+ int min_scl_lowtime_ns;
+ int def_rise_time_ns;
+ int def_fall_time_ns;
+};
+
+static const struct i2c_mode_info info_for_mode[] = {
+ [IC_SPEED_MODE_STANDARD] = {
+ I2C_SPEED_STANDARD_RATE,
+ MIN_SS_SCL_HIGHTIME,
+ MIN_SS_SCL_LOWTIME,
+ 1000,
+ 300,
+ },
+ [IC_SPEED_MODE_FAST] = {
+ I2C_SPEED_FAST_RATE,
+ MIN_FS_SCL_HIGHTIME,
+ MIN_FS_SCL_LOWTIME,
+ 300,
+ 300,
+ },
+ [IC_SPEED_MODE_FAST_PLUS] = {
+ I2C_SPEED_FAST_PLUS_RATE,
+ MIN_FP_SCL_HIGHTIME,
+ MIN_FP_SCL_LOWTIME,
+ 260,
+ 500,
+ },
+ [IC_SPEED_MODE_HIGH] = {
+ I2C_SPEED_HIGH_RATE,
+ MIN_HS_SCL_HIGHTIME,
+ MIN_HS_SCL_LOWTIME,
+ 120,
+ 120,
+ },
+};
+
+/**
+ * dw_i2c_calc_timing() - Calculate the timings to use for a bus
+ *
+ * @priv: Bus private information (NULL if not using driver model)
+ * @mode: Speed mode to use
+ * @ic_clk: IC clock speed in Hz
+ * @spk_cnt: Spike-suppression count
+ * @config: Returns value to use
+ * @return 0 if OK, -EINVAL if the calculation failed due to invalid data
+ */
+static int dw_i2c_calc_timing(struct dw_i2c *priv, enum i2c_speed_mode mode,
+ int ic_clk, int spk_cnt,
+ struct dw_i2c_speed_config *config)
+{
+ int fall_cnt, rise_cnt, min_tlow_cnt, min_thigh_cnt;
+ int hcnt, lcnt, period_cnt, diff, tot;
+ int sda_hold_time_ns, scl_rise_time_ns, scl_fall_time_ns;
+ const struct i2c_mode_info *info;
- cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK));
+ /*
+ * Find the period, rise, fall, min tlow, and min thigh in terms of
+ * counts of the IC clock
+ */
+ info = &info_for_mode[mode];
+ period_cnt = ic_clk / info->speed;
+ scl_rise_time_ns = priv && priv->scl_rise_time_ns ?
+ priv->scl_rise_time_ns : info->def_rise_time_ns;
+ scl_fall_time_ns = priv && priv->scl_fall_time_ns ?
+ priv->scl_fall_time_ns : info->def_fall_time_ns;
+ rise_cnt = calc_counts(ic_clk, scl_rise_time_ns);
+ fall_cnt = calc_counts(ic_clk, scl_fall_time_ns);
+ min_tlow_cnt = calc_counts(ic_clk, info->min_scl_lowtime_ns);
+ min_thigh_cnt = calc_counts(ic_clk, info->min_scl_hightime_ns);
+
+ debug("dw_i2c: period %d rise %d fall %d tlow %d thigh %d spk %d\n",
+ period_cnt, rise_cnt, fall_cnt, min_tlow_cnt, min_thigh_cnt,
+ spk_cnt);
- 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;
+ /*
+ * Back-solve for hcnt and lcnt according to the following equations:
+ * SCL_High_time = [(HCNT + IC_*_SPKLEN + 7) * ic_clk] + SCL_Fall_time
+ * SCL_Low_time = [(LCNT + 1) * ic_clk] - SCL_Fall_time + SCL_Rise_time
+ */
+ hcnt = min_thigh_cnt - fall_cnt - 7 - spk_cnt;
+ lcnt = min_tlow_cnt - rise_cnt + fall_cnt - 1;
- 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;
+ if (hcnt < 0 || lcnt < 0) {
+ debug("dw_i2c: bad counts. hcnt = %d lcnt = %d\n", hcnt, lcnt);
+ return -EINVAL;
+ }
- 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;
+ /*
+ * Now add things back up to ensure the period is hit. If it is off,
+ * split the difference and bias to lcnt for remainder
+ */
+ tot = hcnt + lcnt + 7 + spk_cnt + rise_cnt + 1;
+
+ if (tot < period_cnt) {
+ diff = (period_cnt - tot) / 2;
+ hcnt += diff;
+ lcnt += diff;
+ tot = hcnt + lcnt + 7 + spk_cnt + rise_cnt + 1;
+ lcnt += period_cnt - tot;
}
- writel(cntl, &i2c_regs_p->ic_con);
+ config->scl_lcnt = lcnt;
+ config->scl_hcnt = hcnt;
+
+ /* Use internal default unless other value is specified */
+ sda_hold_time_ns = priv && priv->sda_hold_time_ns ?
+ priv->sda_hold_time_ns : DEFAULT_SDA_HOLD_TIME;
+ config->sda_hold = calc_counts(ic_clk, sda_hold_time_ns);
+
+ debug("dw_i2c: hcnt = %d lcnt = %d sda hold = %d\n", hcnt, lcnt,
+ config->sda_hold);
- /* Enable back i2c now speed set */
- enbl |= IC_ENABLE_0B;
- writel(enbl, &i2c_regs_p->ic_enable);
+ return 0;
}
/*
*
* Set the i2c speed.
*/
-int i2c_set_bus_speed(int speed)
+static unsigned int __dw_i2c_set_bus_speed(struct dw_i2c *priv,
+ struct i2c_regs *i2c_base,
+ unsigned int speed,
+ unsigned int bus_clk)
{
- 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);
+ const struct dw_scl_sda_cfg *scl_sda_cfg = NULL;
+ struct dw_i2c_speed_config config;
+ enum i2c_speed_mode i2c_spd;
+ unsigned int cntl;
+ unsigned int ena;
+ int spk_cnt;
+ int ret;
- return 0;
-}
+ if (priv)
+ scl_sda_cfg = priv->scl_sda_cfg;
+ /* Allow high speed if there is no config, or the config allows it */
+ if (speed >= I2C_SPEED_HIGH_RATE &&
+ (!scl_sda_cfg || scl_sda_cfg->has_high_speed))
+ i2c_spd = IC_SPEED_MODE_HIGH;
+ else if (speed >= I2C_SPEED_FAST_RATE)
+ i2c_spd = IC_SPEED_MODE_FAST_PLUS;
+ else if (speed >= I2C_SPEED_FAST_PLUS_RATE)
+ i2c_spd = IC_SPEED_MODE_FAST;
+ else
+ i2c_spd = IC_SPEED_MODE_STANDARD;
-/*
- * i2c_get_bus_speed - Gets the i2c speed
- *
- * Gets the i2c speed.
- */
-int i2c_get_bus_speed(void)
-{
- u32 cntl;
+ /* Get enable setting for restore later */
+ ena = readl(&i2c_base->ic_enable) & IC_ENABLE_0B;
- cntl = (readl(&i2c_regs_p->ic_con) & IC_CON_SPD_MSK);
+ /* to set speed cltr must be disabled */
+ dw_i2c_enable(i2c_base, false);
- 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;
+ cntl = (readl(&i2c_base->ic_con) & (~IC_CON_SPD_MSK));
- return 0;
-}
+ /* Get the proper spike-suppression count based on target speed */
+ if (!priv || !priv->has_spk_cnt)
+ spk_cnt = 0;
+ else if (i2c_spd >= IC_SPEED_MODE_HIGH)
+ spk_cnt = readl(&i2c_base->hs_spklen);
+ else
+ spk_cnt = readl(&i2c_base->fs_spklen);
+ if (scl_sda_cfg) {
+ config.sda_hold = scl_sda_cfg->sda_hold;
+ if (i2c_spd == IC_SPEED_MODE_STANDARD) {
+ config.scl_hcnt = scl_sda_cfg->ss_hcnt;
+ config.scl_lcnt = scl_sda_cfg->ss_lcnt;
+ } else {
+ config.scl_hcnt = scl_sda_cfg->fs_hcnt;
+ config.scl_lcnt = scl_sda_cfg->fs_lcnt;
+ }
+ } else {
+ ret = dw_i2c_calc_timing(priv, i2c_spd, bus_clk, spk_cnt,
+ &config);
+ if (ret)
+ return log_msg_ret("gen_confg", ret);
+ }
-/*
- * 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;
+ switch (i2c_spd) {
+ case IC_SPEED_MODE_HIGH:
+ cntl |= IC_CON_SPD_SS;
+ writel(config.scl_hcnt, &i2c_base->ic_hs_scl_hcnt);
+ writel(config.scl_lcnt, &i2c_base->ic_hs_scl_lcnt);
+ break;
+ case IC_SPEED_MODE_STANDARD:
+ cntl |= IC_CON_SPD_SS;
+ writel(config.scl_hcnt, &i2c_base->ic_ss_scl_hcnt);
+ writel(config.scl_lcnt, &i2c_base->ic_ss_scl_lcnt);
+ break;
+ case IC_SPEED_MODE_FAST_PLUS:
+ case IC_SPEED_MODE_FAST:
+ default:
+ cntl |= IC_CON_SPD_FS;
+ writel(config.scl_hcnt, &i2c_base->ic_fs_scl_hcnt);
+ writel(config.scl_lcnt, &i2c_base->ic_fs_scl_lcnt);
+ break;
+ }
- /* Disable i2c */
- enbl = readl(&i2c_regs_p->ic_enable);
- enbl &= ~IC_ENABLE_0B;
- writel(enbl, &i2c_regs_p->ic_enable);
+ writel(cntl, &i2c_base->ic_con);
- 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);
+ /* Configure SDA Hold Time if required */
+ if (config.sda_hold)
+ writel(config.sda_hold, &i2c_base->ic_sda_hold);
- /* Enable i2c */
- enbl = readl(&i2c_regs_p->ic_enable);
- enbl |= IC_ENABLE_0B;
- writel(enbl, &i2c_regs_p->ic_enable);
+ /* Restore back i2c now speed set */
+ if (ena == IC_ENABLE_0B)
+ dw_i2c_enable(i2c_base, true);
-#ifdef CONFIG_I2C_MULTI_BUS
- bus_initialized[current_bus] = 1;
-#endif
+ return 0;
}
/*
*
* Sets the target slave address.
*/
-static void i2c_setaddress(unsigned int i2c_addr)
+static void i2c_setaddress(struct i2c_regs *i2c_base, 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);
+ dw_i2c_enable(i2c_base, false);
- writel(i2c_addr, &i2c_regs_p->ic_tar);
+ writel(i2c_addr, &i2c_base->ic_tar);
/* Enable i2c */
- enbl = readl(&i2c_regs_p->ic_enable);
- enbl |= IC_ENABLE_0B;
- writel(enbl, &i2c_regs_p->ic_enable);
+ dw_i2c_enable(i2c_base, true);
}
/*
*
* Flushes the i2c RX FIFO
*/
-static void i2c_flush_rxfifo(void)
+static void i2c_flush_rxfifo(struct i2c_regs *i2c_base)
{
- while (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE)
- readl(&i2c_regs_p->ic_cmd_data);
+ while (readl(&i2c_base->ic_status) & IC_STATUS_RFNE)
+ readl(&i2c_base->ic_cmd_data);
}
/*
*
* Waits for bus busy
*/
-static int i2c_wait_for_bb(void)
+static int i2c_wait_for_bb(struct i2c_regs *i2c_base)
{
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)) {
+ while ((readl(&i2c_base->ic_status) & IC_STATUS_MA) ||
+ !(readl(&i2c_base->ic_status) & IC_STATUS_TFE)) {
/* Evaluate timeout */
if (get_timer(start_time_bb) > (unsigned long)(I2C_BYTE_TO_BB))
return 0;
}
-/* check parameters for i2c_read and i2c_write */
-static int check_params(uint addr, int alen, uchar *buffer, int len)
+static int i2c_xfer_init(struct i2c_regs *i2c_base, uchar chip, uint addr,
+ int alen)
{
- if (buffer == NULL) {
- printf("Buffer is invalid\n");
+ if (i2c_wait_for_bb(i2c_base))
return 1;
- }
- if (alen > 1) {
- printf("addr len %d not supported\n", alen);
- return 1;
+ i2c_setaddress(i2c_base, chip);
+ while (alen) {
+ alen--;
+ /* high byte address going out first */
+ writel((addr >> (alen * 8)) & 0xff,
+ &i2c_base->ic_cmd_data);
}
-
- if (addr + len > 256) {
- printf("address out of range\n");
- return 1;
- }
-
return 0;
}
-static int i2c_xfer_init(uchar chip, uint addr)
-{
- if (i2c_wait_for_bb())
- return 1;
-
- i2c_setaddress(chip);
- writel(addr, &i2c_regs_p->ic_cmd_data);
-
- return 0;
-}
-
-static int i2c_xfer_finish(void)
+static int i2c_xfer_finish(struct i2c_regs *i2c_base)
{
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);
+ if ((readl(&i2c_base->ic_raw_intr_stat) & IC_STOP_DET)) {
+ readl(&i2c_base->ic_clr_stop_det);
break;
} else if (get_timer(start_stop_det) > I2C_STOPDET_TO) {
break;
}
}
- if (i2c_wait_for_bb()) {
+ if (i2c_wait_for_bb(i2c_base)) {
printf("Timed out waiting for bus\n");
return 1;
}
- i2c_flush_rxfifo();
+ i2c_flush_rxfifo(i2c_base);
return 0;
}
*
* Read from i2c memory.
*/
-int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
+static int __dw_i2c_read(struct i2c_regs *i2c_base, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
{
unsigned long start_time_rx;
+ unsigned int active = 0;
#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
/*
* 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);
+ dev |= ((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,
+ debug("%s: fix addr_overflow: dev %02x addr %02x\n", __func__, dev,
addr);
#endif
- if (check_params(addr, alen, buffer, len))
- return 1;
-
- if (i2c_xfer_init(chip, addr))
+ if (i2c_xfer_init(i2c_base, dev, 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 (!active) {
+ /*
+ * Avoid writing to ic_cmd_data multiple times
+ * in case this loop spins too quickly and the
+ * ic_status RFNE bit isn't set after the first
+ * write. Subsequent writes to ic_cmd_data can
+ * trigger spurious i2c transfer.
+ */
+ if (len == 1)
+ writel(IC_CMD | IC_STOP, &i2c_base->ic_cmd_data);
+ else
+ writel(IC_CMD, &i2c_base->ic_cmd_data);
+ active = 1;
+ }
- if (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE) {
- *buffer++ = (uchar)readl(&i2c_regs_p->ic_cmd_data);
+ if (readl(&i2c_base->ic_status) & IC_STATUS_RFNE) {
+ *buffer++ = (uchar)readl(&i2c_base->ic_cmd_data);
len--;
start_time_rx = get_timer(0);
-
+ active = 0;
} else if (get_timer(start_time_rx) > I2C_BYTE_TO) {
- return 1;
+ return 1;
}
}
- return i2c_xfer_finish();
+ return i2c_xfer_finish(i2c_base);
}
/*
*
* Write to i2c memory.
*/
-int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
+static int __dw_i2c_write(struct i2c_regs *i2c_base, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
{
int nb = len;
unsigned long start_time_tx;
* 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);
+ dev |= ((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,
+ debug("%s: fix addr_overflow: dev %02x addr %02x\n", __func__, dev,
addr);
#endif
- if (check_params(addr, alen, buffer, len))
- return 1;
-
- if (i2c_xfer_init(chip, addr))
+ if (i2c_xfer_init(i2c_base, dev, 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);
+ if (readl(&i2c_base->ic_status) & IC_STATUS_TFNF) {
+ if (--len == 0) {
+ writel(*buffer | IC_STOP,
+ &i2c_base->ic_cmd_data);
+ } else {
+ writel(*buffer, &i2c_base->ic_cmd_data);
+ }
buffer++;
start_time_tx = get_timer(0);
}
}
- return i2c_xfer_finish();
+ return i2c_xfer_finish(i2c_base);
}
/*
- * i2c_probe - Probe the i2c chip
+ * __dw_i2c_init - Init function
+ * @speed: required i2c speed
+ * @slaveaddr: slave address for the device
+ *
+ * Initialization function.
*/
-int i2c_probe(uchar chip)
+static int __dw_i2c_init(struct i2c_regs *i2c_base, int speed, int slaveaddr)
{
- u32 tmp;
int ret;
- /*
- * Try to read the first location of the chip.
- */
- ret = i2c_read(chip, 0, 1, (uchar *)&tmp, 1);
+ /* Disable i2c */
+ ret = dw_i2c_enable(i2c_base, false);
if (ret)
- i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+ return ret;
+
+ writel(IC_CON_SD | IC_CON_RE | IC_CON_SPD_FS | IC_CON_MM,
+ &i2c_base->ic_con);
+ writel(IC_RX_TL, &i2c_base->ic_rx_tl);
+ writel(IC_TX_TL, &i2c_base->ic_tx_tl);
+ writel(IC_STOP_DET, &i2c_base->ic_intr_mask);
+#ifndef CONFIG_DM_I2C
+ __dw_i2c_set_bus_speed(NULL, i2c_base, speed, IC_CLK);
+ writel(slaveaddr, &i2c_base->ic_sar);
+#endif
- return ret;
+ /* Enable i2c */
+ ret = dw_i2c_enable(i2c_base, true);
+ if (ret)
+ return ret;
+
+ return 0;
}
-#ifdef CONFIG_I2C_MULTI_BUS
-int i2c_set_bus_num(unsigned int bus)
+#ifndef CONFIG_DM_I2C
+/*
+ * The legacy I2C functions. These need to get removed once
+ * all users of this driver are converted to DM.
+ */
+static struct i2c_regs *i2c_get_base(struct i2c_adapter *adap)
{
- 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
+ switch (adap->hwadapnr) {
+#if CONFIG_SYS_I2C_BUS_MAX >= 4
case 3:
- i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE3;
- break;
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE3;
#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;
+#if CONFIG_SYS_I2C_BUS_MAX >= 3
+ case 2:
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE2;
#endif
-#ifdef CONFIG_SYS_I2C_BASE6
- case 6:
- i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE6;
- break;
+#if CONFIG_SYS_I2C_BUS_MAX >= 2
+ case 1:
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE1;
#endif
-#ifdef CONFIG_SYS_I2C_BASE7
- case 7:
- i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE7;
- break;
+ case 0:
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
+ default:
+ printf("Wrong I2C-adapter number %d\n", adap->hwadapnr);
+ }
+
+ return NULL;
+}
+
+static unsigned int dw_i2c_set_bus_speed(struct i2c_adapter *adap,
+ unsigned int speed)
+{
+ adap->speed = speed;
+ return __dw_i2c_set_bus_speed(NULL, i2c_get_base(adap), speed, IC_CLK);
+}
+
+static void dw_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
+{
+ __dw_i2c_init(i2c_get_base(adap), speed, slaveaddr);
+}
+
+static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
+{
+ return __dw_i2c_read(i2c_get_base(adap), dev, addr, alen, buffer, len);
+}
+
+static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
+{
+ return __dw_i2c_write(i2c_get_base(adap), dev, addr, alen, buffer, len);
+}
+
+/* dw_i2c_probe - Probe the i2c chip */
+static int dw_i2c_probe(struct i2c_adapter *adap, u8 dev)
+{
+ struct i2c_regs *i2c_base = i2c_get_base(adap);
+ u32 tmp;
+ int ret;
+
+ /*
+ * Try to read the first location of the chip.
+ */
+ ret = __dw_i2c_read(i2c_base, dev, 0, 1, (uchar *)&tmp, 1);
+ if (ret)
+ dw_i2c_init(adap, adap->speed, adap->slaveaddr);
+
+ return ret;
+}
+
+U_BOOT_I2C_ADAP_COMPLETE(dw_0, dw_i2c_init, dw_i2c_probe, dw_i2c_read,
+ dw_i2c_write, dw_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 0)
+
+#if CONFIG_SYS_I2C_BUS_MAX >= 2
+U_BOOT_I2C_ADAP_COMPLETE(dw_1, dw_i2c_init, dw_i2c_probe, dw_i2c_read,
+ dw_i2c_write, dw_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_SPEED1, CONFIG_SYS_I2C_SLAVE1, 1)
#endif
-#ifdef CONFIG_SYS_I2C_BASE8
- case 8:
- i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE8;
- break;
+
+#if CONFIG_SYS_I2C_BUS_MAX >= 3
+U_BOOT_I2C_ADAP_COMPLETE(dw_2, dw_i2c_init, dw_i2c_probe, dw_i2c_read,
+ dw_i2c_write, dw_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_SPEED2, CONFIG_SYS_I2C_SLAVE2, 2)
#endif
-#ifdef CONFIG_SYS_I2C_BASE9
- case 9:
- i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE9;
- break;
+
+#if CONFIG_SYS_I2C_BUS_MAX >= 4
+U_BOOT_I2C_ADAP_COMPLETE(dw_3, dw_i2c_init, dw_i2c_probe, dw_i2c_read,
+ dw_i2c_write, dw_i2c_set_bus_speed,
+ CONFIG_SYS_I2C_SPEED3, CONFIG_SYS_I2C_SLAVE3, 3)
#endif
- default:
- printf("Bad bus: %d\n", bus);
- return -1;
+
+#else /* CONFIG_DM_I2C */
+/* The DM I2C functions */
+
+static int designware_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
+ int nmsgs)
+{
+ struct dw_i2c *i2c = 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 = __dw_i2c_read(i2c->regs, msg->addr, 0, 0,
+ msg->buf, msg->len);
+ } else {
+ ret = __dw_i2c_write(i2c->regs, msg->addr, 0, 0,
+ msg->buf, msg->len);
+ }
+ if (ret) {
+ debug("i2c_write: error sending\n");
+ return -EREMOTEIO;
+ }
}
- current_bus = bus;
+ return 0;
+}
- if (!bus_initialized[current_bus])
- i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+static int designware_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
+{
+ struct dw_i2c *i2c = dev_get_priv(bus);
+ ulong rate;
+
+#if CONFIG_IS_ENABLED(CLK)
+ rate = clk_get_rate(&i2c->clk);
+ if (IS_ERR_VALUE(rate))
+ return -EINVAL;
+#else
+ rate = IC_CLK;
+#endif
+ return __dw_i2c_set_bus_speed(i2c, i2c->regs, speed, rate);
+}
+
+static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr,
+ uint chip_flags)
+{
+ struct dw_i2c *i2c = dev_get_priv(bus);
+ struct i2c_regs *i2c_base = i2c->regs;
+ u32 tmp;
+ int ret;
+
+ /* Try to read the first location of the chip */
+ ret = __dw_i2c_read(i2c_base, chip_addr, 0, 1, (uchar *)&tmp, 1);
+ if (ret)
+ __dw_i2c_init(i2c_base, 0, 0);
+
+ return ret;
+}
+
+int designware_i2c_ofdata_to_platdata(struct udevice *bus)
+{
+ struct dw_i2c *priv = dev_get_priv(bus);
+
+ if (!priv->regs)
+ priv->regs = (struct i2c_regs *)devfdt_get_addr_ptr(bus);
+ dev_read_u32(bus, "i2c-scl-rising-time-ns", &priv->scl_rise_time_ns);
+ dev_read_u32(bus, "i2c-scl-falling-time-ns", &priv->scl_fall_time_ns);
+ dev_read_u32(bus, "i2c-sda-hold-time-ns", &priv->sda_hold_time_ns);
return 0;
}
-int i2c_get_bus_num(void)
+int designware_i2c_probe(struct udevice *bus)
{
- return current_bus;
+ struct dw_i2c *priv = dev_get_priv(bus);
+ int ret;
+
+ ret = reset_get_bulk(bus, &priv->resets);
+ if (ret)
+ dev_warn(bus, "Can't get reset: %d\n", ret);
+ else
+ reset_deassert_bulk(&priv->resets);
+
+#if CONFIG_IS_ENABLED(CLK)
+ ret = clk_get_by_index(bus, 0, &priv->clk);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(&priv->clk);
+ if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
+ clk_free(&priv->clk);
+ dev_err(bus, "failed to enable clock\n");
+ return ret;
+ }
+#endif
+
+ return __dw_i2c_init(priv->regs, 0, 0);
}
+
+int designware_i2c_remove(struct udevice *dev)
+{
+ struct dw_i2c *priv = dev_get_priv(dev);
+
+#if CONFIG_IS_ENABLED(CLK)
+ clk_disable(&priv->clk);
+ clk_free(&priv->clk);
#endif
+
+ return reset_release_bulk(&priv->resets);
+}
+
+const struct dm_i2c_ops designware_i2c_ops = {
+ .xfer = designware_i2c_xfer,
+ .probe_chip = designware_i2c_probe_chip,
+ .set_bus_speed = designware_i2c_set_bus_speed,
+};
+
+static const struct udevice_id designware_i2c_ids[] = {
+ { .compatible = "snps,designware-i2c" },
+ { }
+};
+
+U_BOOT_DRIVER(i2c_designware) = {
+ .name = "i2c_designware",
+ .id = UCLASS_I2C,
+ .of_match = designware_i2c_ids,
+ .ofdata_to_platdata = designware_i2c_ofdata_to_platdata,
+ .probe = designware_i2c_probe,
+ .priv_auto_alloc_size = sizeof(struct dw_i2c),
+ .remove = designware_i2c_remove,
+ .flags = DM_FLAG_OS_PREPARE,
+ .ops = &designware_i2c_ops,
+};
+
+#endif /* CONFIG_DM_I2C */
projects / oweals / u-boot.git / blobdiff