Earlier, a driver exists in the u-boot source for designware i2c interface. That
driver was specific to spear platforms. This patch implements the i2c controller
as a generic driver which can be used by multiple platforms
The driver files are now renamed to designware_i2c.c and designware_i2c.h and
these are moved into drivers/i2c folder for reusability by other
platforms
Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>
+++ /dev/null
-/*
- * (C) Copyright 2009
- * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * 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
- */
-
-#ifndef __SPR_I2C_H_
-#define __SPR_I2C_H_
-
-struct i2c_regs {
- u32 ic_con;
- u32 ic_tar;
- u32 ic_sar;
- u32 ic_hs_maddr;
- u32 ic_cmd_data;
- u32 ic_ss_scl_hcnt;
- u32 ic_ss_scl_lcnt;
- u32 ic_fs_scl_hcnt;
- u32 ic_fs_scl_lcnt;
- u32 ic_hs_scl_hcnt;
- u32 ic_hs_scl_lcnt;
- u32 ic_intr_stat;
- u32 ic_intr_mask;
- u32 ic_raw_intr_stat;
- u32 ic_rx_tl;
- u32 ic_tx_tl;
- u32 ic_clr_intr;
- u32 ic_clr_rx_under;
- u32 ic_clr_rx_over;
- u32 ic_clr_tx_over;
- u32 ic_clr_rd_req;
- u32 ic_clr_tx_abrt;
- u32 ic_clr_rx_done;
- u32 ic_clr_activity;
- u32 ic_clr_stop_det;
- u32 ic_clr_start_det;
- u32 ic_clr_gen_call;
- u32 ic_enable;
- u32 ic_status;
- u32 ic_txflr;
- u32 ix_rxflr;
- u32 reserved_1;
- u32 ic_tx_abrt_source;
-};
-
-#define IC_CLK 166
-#define NANO_TO_MICRO 1000
-
-/* High and low times in different speed modes (in ns) */
-#define MIN_SS_SCL_HIGHTIME 4000
-#define MIN_SS_SCL_LOWTIME 5000
-#define MIN_FS_SCL_HIGHTIME 800
-#define MIN_FS_SCL_LOWTIME 1700
-#define MIN_HS_SCL_HIGHTIME 60
-#define MIN_HS_SCL_LOWTIME 160
-
-/* Worst case timeout for 1 byte is kept as 2ms */
-#define I2C_BYTE_TO (CONFIG_SYS_HZ/500)
-#define I2C_STOPDET_TO (CONFIG_SYS_HZ/500)
-#define I2C_BYTE_TO_BB (I2C_BYTE_TO * 16)
-
-/* i2c control register definitions */
-#define IC_CON_SD 0x0040
-#define IC_CON_RE 0x0020
-#define IC_CON_10BITADDRMASTER 0x0010
-#define IC_CON_10BITADDR_SLAVE 0x0008
-#define IC_CON_SPD_MSK 0x0006
-#define IC_CON_SPD_SS 0x0002
-#define IC_CON_SPD_FS 0x0004
-#define IC_CON_SPD_HS 0x0006
-#define IC_CON_MM 0x0001
-
-/* i2c target address register definitions */
-#define TAR_ADDR 0x0050
-
-/* i2c slave address register definitions */
-#define IC_SLAVE_ADDR 0x0002
-
-/* i2c data buffer and command register definitions */
-#define IC_CMD 0x0100
-
-/* i2c interrupt status register definitions */
-#define IC_GEN_CALL 0x0800
-#define IC_START_DET 0x0400
-#define IC_STOP_DET 0x0200
-#define IC_ACTIVITY 0x0100
-#define IC_RX_DONE 0x0080
-#define IC_TX_ABRT 0x0040
-#define IC_RD_REQ 0x0020
-#define IC_TX_EMPTY 0x0010
-#define IC_TX_OVER 0x0008
-#define IC_RX_FULL 0x0004
-#define IC_RX_OVER 0x0002
-#define IC_RX_UNDER 0x0001
-
-/* fifo threshold register definitions */
-#define IC_TL0 0x00
-#define IC_TL1 0x01
-#define IC_TL2 0x02
-#define IC_TL3 0x03
-#define IC_TL4 0x04
-#define IC_TL5 0x05
-#define IC_TL6 0x06
-#define IC_TL7 0x07
-#define IC_RX_TL IC_TL0
-#define IC_TX_TL IC_TL0
-
-/* i2c enable register definitions */
-#define IC_ENABLE_0B 0x0001
-
-/* i2c status register definitions */
-#define IC_STATUS_SA 0x0040
-#define IC_STATUS_MA 0x0020
-#define IC_STATUS_RFF 0x0010
-#define IC_STATUS_RFNE 0x0008
-#define IC_STATUS_TFE 0x0004
-#define IC_STATUS_TFNF 0x0002
-#define IC_STATUS_ACT 0x0001
-
-/* Speed Selection */
-#define IC_SPEED_MODE_STANDARD 1
-#define IC_SPEED_MODE_FAST 2
-#define IC_SPEED_MODE_MAX 3
-
-#define I2C_MAX_SPEED 3400000
-#define I2C_FAST_SPEED 400000
-#define I2C_STANDARD_SPEED 100000
-
-#endif /* __SPR_I2C_H_ */
COBJS-$(CONFIG_BFIN_TWI_I2C) += bfin-twi_i2c.o
COBJS-$(CONFIG_DRIVER_DAVINCI_I2C) += davinci_i2c.o
+COBJS-$(CONFIG_DW_I2C) += designware_i2c.o
COBJS-$(CONFIG_FSL_I2C) += fsl_i2c.o
COBJS-$(CONFIG_I2C_MVTWSI) += mvtwsi.o
COBJS-$(CONFIG_I2C_MV) += mv_i2c.o
COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o
-COBJS-$(CONFIG_SPEAR_I2C) += spr_i2c.o
COBJS-$(CONFIG_TEGRA_I2C) += tegra_i2c.o
COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
--- /dev/null
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include "designware_i2c.h"
+
+static struct i2c_regs *const 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 high, low;
+
+ cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK));
+
+ switch (i2c_spd) {
+ case IC_SPEED_MODE_MAX:
+ cntl |= IC_CON_SPD_HS;
+ high = MIN_HS_SCL_HIGHTIME;
+ low = MIN_HS_SCL_LOWTIME;
+ break;
+
+ case IC_SPEED_MODE_STANDARD:
+ cntl |= IC_CON_SPD_SS;
+ high = MIN_SS_SCL_HIGHTIME;
+ low = MIN_SS_SCL_LOWTIME;
+ break;
+
+ case IC_SPEED_MODE_FAST:
+ default:
+ cntl |= IC_CON_SPD_FS;
+ high = MIN_FS_SCL_HIGHTIME;
+ low = MIN_FS_SCL_LOWTIME;
+ break;
+ }
+
+ writel(cntl, &i2c_regs_p->ic_con);
+
+ hcnt = (IC_CLK * high) / NANO_TO_MICRO;
+ writel(hcnt, &i2c_regs_p->ic_fs_scl_hcnt);
+
+ lcnt = (IC_CLK * low) / NANO_TO_MICRO;
+ writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt);
+}
+
+/*
+ * i2c_set_bus_speed - Set the i2c speed
+ * @speed: required i2c speed
+ *
+ * Set the i2c speed.
+ */
+void 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);
+}
+
+/*
+ * 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);
+}
+
+/*
+ * 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)
+{
+ writel(i2c_addr, &i2c_regs_p->ic_tar);
+}
+
+/*
+ * 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;
+}
+
+/* check parameters for i2c_read and i2c_write */
+static int check_params(uint addr, int alen, uchar *buffer, int len)
+{
+ if (buffer == NULL) {
+ printf("Buffer is invalid\n");
+ return 1;
+ }
+
+ if (alen > 1) {
+ printf("addr len %d not supported\n", alen);
+ return 1;
+ }
+
+ 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()) {
+ printf("Timed out waiting for bus\n");
+ return 1;
+ }
+
+ i2c_setaddress(chip);
+ writel(addr, &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();
+
+ /* Wait for read/write operation to complete on actual memory */
+ udelay(10000);
+
+ 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;
+
+ if (check_params(addr, alen, buffer, len))
+ return 1;
+
+ if (i2c_xfer_init(chip, addr))
+ return 1;
+
+ start_time_rx = get_timer(0);
+ while (len) {
+ 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) {
+ printf("Timed out. i2c read Failed\n");
+ 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;
+
+ if (check_params(addr, alen, buffer, len))
+ return 1;
+
+ if (i2c_xfer_init(chip, addr))
+ return 1;
+
+ start_time_tx = get_timer(0);
+ while (len) {
+ if (readl(&i2c_regs_p->ic_status) & IC_STATUS_TFNF) {
+ writel(*buffer, &i2c_regs_p->ic_cmd_data);
+ buffer++;
+ len--;
+ 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;
+
+ /*
+ * Try to read the first location of the chip.
+ */
+ return i2c_read(chip, 0, 1, (uchar *)&tmp, 1);
+}
--- /dev/null
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ */
+
+#ifndef __DW_I2C_H_
+#define __DW_I2C_H_
+
+struct i2c_regs {
+ u32 ic_con;
+ u32 ic_tar;
+ u32 ic_sar;
+ u32 ic_hs_maddr;
+ u32 ic_cmd_data;
+ u32 ic_ss_scl_hcnt;
+ u32 ic_ss_scl_lcnt;
+ u32 ic_fs_scl_hcnt;
+ u32 ic_fs_scl_lcnt;
+ u32 ic_hs_scl_hcnt;
+ u32 ic_hs_scl_lcnt;
+ u32 ic_intr_stat;
+ u32 ic_intr_mask;
+ u32 ic_raw_intr_stat;
+ u32 ic_rx_tl;
+ u32 ic_tx_tl;
+ u32 ic_clr_intr;
+ u32 ic_clr_rx_under;
+ u32 ic_clr_rx_over;
+ u32 ic_clr_tx_over;
+ u32 ic_clr_rd_req;
+ u32 ic_clr_tx_abrt;
+ u32 ic_clr_rx_done;
+ u32 ic_clr_activity;
+ u32 ic_clr_stop_det;
+ u32 ic_clr_start_det;
+ u32 ic_clr_gen_call;
+ u32 ic_enable;
+ u32 ic_status;
+ u32 ic_txflr;
+ u32 ix_rxflr;
+ u32 reserved_1;
+ u32 ic_tx_abrt_source;
+};
+
+#define IC_CLK 166
+#define NANO_TO_MICRO 1000
+
+/* High and low times in different speed modes (in ns) */
+#define MIN_SS_SCL_HIGHTIME 4000
+#define MIN_SS_SCL_LOWTIME 5000
+#define MIN_FS_SCL_HIGHTIME 800
+#define MIN_FS_SCL_LOWTIME 1700
+#define MIN_HS_SCL_HIGHTIME 60
+#define MIN_HS_SCL_LOWTIME 160
+
+/* Worst case timeout for 1 byte is kept as 2ms */
+#define I2C_BYTE_TO (CONFIG_SYS_HZ/500)
+#define I2C_STOPDET_TO (CONFIG_SYS_HZ/500)
+#define I2C_BYTE_TO_BB (I2C_BYTE_TO * 16)
+
+/* i2c control register definitions */
+#define IC_CON_SD 0x0040
+#define IC_CON_RE 0x0020
+#define IC_CON_10BITADDRMASTER 0x0010
+#define IC_CON_10BITADDR_SLAVE 0x0008
+#define IC_CON_SPD_MSK 0x0006
+#define IC_CON_SPD_SS 0x0002
+#define IC_CON_SPD_FS 0x0004
+#define IC_CON_SPD_HS 0x0006
+#define IC_CON_MM 0x0001
+
+/* i2c target address register definitions */
+#define TAR_ADDR 0x0050
+
+/* i2c slave address register definitions */
+#define IC_SLAVE_ADDR 0x0002
+
+/* i2c data buffer and command register definitions */
+#define IC_CMD 0x0100
+
+/* i2c interrupt status register definitions */
+#define IC_GEN_CALL 0x0800
+#define IC_START_DET 0x0400
+#define IC_STOP_DET 0x0200
+#define IC_ACTIVITY 0x0100
+#define IC_RX_DONE 0x0080
+#define IC_TX_ABRT 0x0040
+#define IC_RD_REQ 0x0020
+#define IC_TX_EMPTY 0x0010
+#define IC_TX_OVER 0x0008
+#define IC_RX_FULL 0x0004
+#define IC_RX_OVER 0x0002
+#define IC_RX_UNDER 0x0001
+
+/* fifo threshold register definitions */
+#define IC_TL0 0x00
+#define IC_TL1 0x01
+#define IC_TL2 0x02
+#define IC_TL3 0x03
+#define IC_TL4 0x04
+#define IC_TL5 0x05
+#define IC_TL6 0x06
+#define IC_TL7 0x07
+#define IC_RX_TL IC_TL0
+#define IC_TX_TL IC_TL0
+
+/* i2c enable register definitions */
+#define IC_ENABLE_0B 0x0001
+
+/* i2c status register definitions */
+#define IC_STATUS_SA 0x0040
+#define IC_STATUS_MA 0x0020
+#define IC_STATUS_RFF 0x0010
+#define IC_STATUS_RFNE 0x0008
+#define IC_STATUS_TFE 0x0004
+#define IC_STATUS_TFNF 0x0002
+#define IC_STATUS_ACT 0x0001
+
+/* Speed Selection */
+#define IC_SPEED_MODE_STANDARD 1
+#define IC_SPEED_MODE_FAST 2
+#define IC_SPEED_MODE_MAX 3
+
+#define I2C_MAX_SPEED 3400000
+#define I2C_FAST_SPEED 400000
+#define I2C_STANDARD_SPEED 100000
+
+#endif /* __DW_I2C_H_ */
+++ /dev/null
-/*
- * (C) Copyright 2009
- * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * 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>
-#include <asm/io.h>
-#include <asm/arch/hardware.h>
-#include <asm/arch/spr_i2c.h>
-
-static struct i2c_regs *const 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 high, low;
-
- cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK));
-
- switch (i2c_spd) {
- case IC_SPEED_MODE_MAX:
- cntl |= IC_CON_SPD_HS;
- high = MIN_HS_SCL_HIGHTIME;
- low = MIN_HS_SCL_LOWTIME;
- break;
-
- case IC_SPEED_MODE_STANDARD:
- cntl |= IC_CON_SPD_SS;
- high = MIN_SS_SCL_HIGHTIME;
- low = MIN_SS_SCL_LOWTIME;
- break;
-
- case IC_SPEED_MODE_FAST:
- default:
- cntl |= IC_CON_SPD_FS;
- high = MIN_FS_SCL_HIGHTIME;
- low = MIN_FS_SCL_LOWTIME;
- break;
- }
-
- writel(cntl, &i2c_regs_p->ic_con);
-
- hcnt = (IC_CLK * high) / NANO_TO_MICRO;
- writel(hcnt, &i2c_regs_p->ic_fs_scl_hcnt);
-
- lcnt = (IC_CLK * low) / NANO_TO_MICRO;
- writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt);
-}
-
-/*
- * i2c_set_bus_speed - Set the i2c speed
- * @speed: required i2c speed
- *
- * Set the i2c speed.
- */
-void 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);
-}
-
-/*
- * 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 spear 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);
-}
-
-/*
- * 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)
-{
- writel(i2c_addr, &i2c_regs_p->ic_tar);
-}
-
-/*
- * 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;
-}
-
-/* check parameters for i2c_read and i2c_write */
-static int check_params(uint addr, int alen, uchar *buffer, int len)
-{
- if (buffer == NULL) {
- printf("Buffer is invalid\n");
- return 1;
- }
-
- if (alen > 1) {
- printf("addr len %d not supported\n", alen);
- return 1;
- }
-
- 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()) {
- printf("Timed out waiting for bus\n");
- return 1;
- }
-
- i2c_setaddress(chip);
- writel(addr, &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();
-
- /* Wait for read/write operation to complete on actual memory */
- udelay(10000);
-
- 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;
-
- if (check_params(addr, alen, buffer, len))
- return 1;
-
- if (i2c_xfer_init(chip, addr))
- return 1;
-
- start_time_rx = get_timer(0);
- while (len) {
- 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) {
- printf("Timed out. i2c read Failed\n");
- 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;
-
- if (check_params(addr, alen, buffer, len))
- return 1;
-
- if (i2c_xfer_init(chip, addr))
- return 1;
-
- start_time_tx = get_timer(0);
- while (len) {
- if (readl(&i2c_regs_p->ic_status) & IC_STATUS_TFNF) {
- writel(*buffer, &i2c_regs_p->ic_cmd_data);
- buffer++;
- len--;
- 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;
-
- /*
- * Try to read the first location of the chip.
- */
- return i2c_read(chip, 0, 1, (uchar *)&tmp, 1);
-}
/* I2C driver configuration */
#define CONFIG_HARD_I2C
-#define CONFIG_SPEAR_I2C
+#define CONFIG_DW_I2C
#define CONFIG_SYS_I2C_SPEED 400000
#define CONFIG_SYS_I2C_SLAVE 0x02
projects / u-boot / commitdiff