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path: root/drivers/i2c/spr_i2c.c
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Diffstat (limited to 'drivers/i2c/spr_i2c.c')
-rwxr-xr-xdrivers/i2c/spr_i2c.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/i2c/spr_i2c.c b/drivers/i2c/spr_i2c.c
new file mode 100755
index 0000000..eabfe84
--- /dev/null
+++ b/drivers/i2c/spr_i2c.c
@@ -0,0 +1,331 @@
+/*
+ * (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);
+}