[U-Boot] [PATCH 2/3] Add support for Maxim's DS4510 I2C device
Peter Tyser
ptyser at xes-inc.com
Fri Oct 24 00:23:58 CEST 2008
Initial support for the DS4510, a CPU supervisor with
integrated EEPROM, SRAM, and 4 programmable non-volatile
GPIO pins. The CONFIG_DS4510 define enables support
for the device while the CONFIG_CMD_DS4510 define
enables the ds4510 command.
Signed-off-by: Peter Tyser <ptyser at xes-inc.com>
---
README | 2 +
drivers/gpio/Makefile | 1 +
drivers/gpio/ds4510.c | 344 +++++++++++++++++++++++++++++++++++++++++++++++++
include/gpio/ds4510.h | 75 +++++++++++
4 files changed, 422 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/ds4510.c
create mode 100644 include/gpio/ds4510.h
diff --git a/README b/README
index 73bed41..2c0a19f 100644
--- a/README
+++ b/README
@@ -572,6 +572,7 @@ The following options need to be configured:
CONFIG_CMD_DHCP * DHCP support
CONFIG_CMD_DIAG * Diagnostics
CONFIG_CMD_DOC * Disk-On-Chip Support
+ CONFIG_CMD_DS4510 * ds4510 I2C gpio/memory commands
CONFIG_CMD_DTT * Digital Therm and Thermostat
CONFIG_CMD_ECHO echo arguments
CONFIG_CMD_EEPROM * EEPROM read/write support
@@ -681,6 +682,7 @@ The following options need to be configured:
- GPIO Support:
CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
+ CONFIG_DS4510 - use Maxim's DS4510 I2C GPIO/eeprom
Note that if the GPIO device uses I2C, then the I2C interface
must also be configured. See I2C Support, below.
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index dd618ed..11f0903 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libgpio.a
COBJS-$(CONFIG_PCA953X) += pca953x.o
+COBJS-$(CONFIG_DS4510) += ds4510.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/gpio/ds4510.c b/drivers/gpio/ds4510.c
new file mode 100644
index 0000000..8b9a836
--- /dev/null
+++ b/drivers/gpio/ds4510.c
@@ -0,0 +1,344 @@
+/*
+ * Copyright 2008 Extreme Engineering Solutions, 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
+ */
+
+/*
+ * Driver for DS4510, a CPU supervisor with integrated EEPROM, SRAM,
+ * and 4 programmable non-volatile GPIO pins.
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <command.h>
+#include <gpio/ds4510.h>
+
+/*
+ * Write to DS4510, taking page boundaries into account
+ */
+int ds4510_mem_write(uint8_t chip, int offset, uint8_t *buf, int count)
+{
+ int wrlen;
+ int i = 0;
+
+ do {
+ wrlen = DS4510_EEPROM_PAGE_SIZE -
+ DS4510_EEPROM_PAGE_OFFSET(offset);
+ if (count < wrlen)
+ wrlen = count;
+ i2c_write(chip, offset, 1, &buf[i], wrlen);
+
+ /* This delay isn't needed for SRAM writes but shouldn't delay
+ * things too much, so do it unconditionally for simplicity */
+ udelay(DS4510_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
+ count -= wrlen;
+ offset += wrlen;
+ i += wrlen;
+ } while (count > 0);
+
+ return 0;
+}
+
+/*
+ * General read from DS4510
+ */
+int ds4510_mem_read(uint8_t chip, int offset, uint8_t *buf, int count)
+{
+ return i2c_read(chip, offset, 1, buf, count);
+}
+
+/*
+ * Write SEE bit in config register.
+ * nv = 0 - Writes to SEEPROM registers behave like EEPROM
+ * nv = 1 - Writes to SEEPROM registers behave like SRAM
+ */
+int ds4510_see_write(uint8_t chip, uint8_t nv)
+{
+ uint8_t data;
+
+ if (i2c_read(chip, DS4510_CFG, 1, &data, 1))
+ return -1;
+
+ if (nv) /* Treat SEEPROM bits as EEPROM */
+ data &= ~DS4510_CFG_SEE;
+ else /* Treat SEEPROM bits as SRAM */
+ data |= DS4510_CFG_SEE;
+
+ return ds4510_mem_write(chip, DS4510_CFG, &data, 1);
+}
+
+/*
+ * Write de-assertion of reset signal delay
+ */
+int ds4510_rstdelay_write(uint8_t chip, uint8_t delay)
+{
+ uint8_t data;
+
+ if (i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1))
+ return -1;
+
+ data &= ~DS4510_RSTDELAY_MASK;
+ data |= delay & DS4510_RSTDELAY_MASK;
+
+ return ds4510_mem_write(chip, DS4510_RSTDELAY, &data, 1);
+}
+
+/*
+ * Write pullup characteristics of IO pins
+ */
+int ds4510_pullup_write(uint8_t chip, uint8_t val)
+{
+ val &= DS4510_IO_MASK;
+
+ return ds4510_mem_write(chip, DS4510_PULLUP, (uint8_t *)&val, 1);
+}
+
+/*
+ * Read pullup characteristics of IO pins
+ */
+int ds4510_pullup_read(uint8_t chip)
+{
+ uint8_t val;
+
+ if (i2c_read(chip, DS4510_PULLUP, 1, &val, 1))
+ return -1;
+
+ return val & DS4510_IO_MASK;
+}
+
+/*
+ * Write drive level of IO pins
+ */
+int ds4510_gpio_write(uint8_t chip, uint8_t val)
+{
+ uint8_t data;
+ int i;
+
+ for (i = 0; i < DS4510_NUM_IO; i++) {
+ i2c_read(chip, DS4510_IO0 - i, 1, &data, 1);
+
+ if (val & (0x1 << i))
+ data |= 0x1;
+ else
+ data &= ~0x1;
+
+ ds4510_mem_write(chip, DS4510_IO0 - i, &data, 1);
+ }
+
+ return 0;
+}
+
+/*
+ * Read drive level of IO pins
+ */
+int ds4510_gpio_read(uint8_t chip)
+{
+ uint8_t data;
+ int val = 0;
+ int i;
+
+ for (i = 0; i < DS4510_NUM_IO; i++) {
+ i2c_read(chip, DS4510_IO0 - i, 1, &data, 1);
+
+ if (data & 1)
+ val |= (1 << i);
+ }
+
+ return val;
+}
+
+/*
+ * Read physical level of IO pins
+ */
+int ds4510_gpio_read_val(uint8_t chip)
+{
+ uint8_t val;
+
+ if (i2c_read(chip, DS4510_IO_STATUS, 1, &val, 1))
+ return -1;
+
+ return val & DS4510_IO_MASK;
+}
+
+#if defined(CONFIG_CMD_DS4510)
+/*
+ * Display DS4510 information
+ */
+static int ds4510_info(uint8_t chip)
+{
+ int i;
+ int tmp;
+ uint8_t data;
+
+ printf("DS4510 @ 0x%x:\n\n", chip);
+
+ i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1);
+ printf("rstdelay = 0x%x\n\n", data & DS4510_RSTDELAY_MASK);
+
+ i2c_read(chip, DS4510_CFG, 1, &data, 1);
+ printf("config = 0x%x\n", data);
+ printf(" /ready = %d\n", data & DS4510_CFG_READY ? 1 : 0);
+ printf(" trip pt = %d\n", data & DS4510_CFG_TRIP_POINT ? 1 : 0);
+ printf(" rst sts = %d\n", data & DS4510_CFG_RESET ? 1 : 0);
+ printf(" /see = %d\n", data & DS4510_CFG_SEE ? 1 : 0);
+ printf(" swrst = %d\n\n", data & DS4510_CFG_SWRST ? 1 : 0);
+
+ printf("gpio pins: 3210\n");
+ printf("---------------\n");
+ printf("pullup ");
+
+ tmp = ds4510_pullup_read(chip);
+ for (i = DS4510_NUM_IO - 1; i >= 0; i--)
+ printf("%d", (tmp & (1 << i)) ? 1 : 0);
+ printf("\n");
+
+ printf("driven ");
+ tmp = ds4510_gpio_read(chip);
+ for (i = DS4510_NUM_IO - 1; i >= 0; i--)
+ printf("%d", (tmp & (1 << i)) ? 1 : 0);
+ printf("\n");
+
+ printf("read ");
+ tmp = ds4510_gpio_read_val(chip);
+ for (i = DS4510_NUM_IO - 1; i >= 0; i--)
+ printf("%d", (tmp & (1 << i)) ? 1 : 0);
+ printf("\n");
+
+ return 0;
+}
+
+int do_ds4510(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ ulong addr;
+ ulong pin;
+ ulong val;
+ ulong off;
+ ulong cnt;
+ int end;
+ uint8_t chip;
+ int tmp;
+ int (*rw_func)(uint8_t, int, uint8_t *, int);
+
+ chip = (uint8_t)simple_strtoul(argv[1], NULL, 16);
+
+ if (i2c_probe(chip)) {
+ printf("I2C device 0x%02x not found\n", chip);
+ return -1;
+ }
+
+ switch (argc) {
+ case 3:
+ if (strcmp(argv[2], "info") == 0)
+ return ds4510_info(chip);
+ break;
+ case 4:
+ val = simple_strtoul(argv[3], NULL, 16);
+
+ if (strcmp(argv[2], "nv") == 0)
+ return ds4510_see_write(chip, val);
+ else if (strcmp(argv[2], "rstdelay") == 0)
+ return ds4510_rstdelay_write(chip, val);
+ else if (strcmp(argv[2], "input") == 0)
+ return (ds4510_gpio_read_val(chip) & (1 << val)) != 0;
+ break;
+ case 5:
+ pin = simple_strtoul(argv[3], NULL, 16);
+ val = simple_strtoul(argv[4], NULL, 16);
+
+ if (pin >= DS4510_NUM_IO)
+ break;
+
+ if (strcmp(argv[2], "output") == 0) {
+ tmp = ds4510_gpio_read(chip);
+ if (val)
+ tmp |= (1 << pin);
+ else
+ tmp &= ~(1 << pin);
+ return ds4510_gpio_write(chip, tmp);
+ } else if (strcmp(argv[2], "pullup") == 0) {
+ tmp = ds4510_pullup_read(chip);
+ if (val)
+ tmp |= (1 << pin);
+ else
+ tmp &= ~(1 << pin);
+ return ds4510_pullup_write(chip, tmp);
+ }
+ break;
+ case 7:
+ addr = simple_strtoul(argv[4], NULL, 16);
+ off = simple_strtoul(argv[5], NULL, 16);
+ cnt = simple_strtoul(argv[6], NULL, 16);
+
+ if (strcmp(argv[3], "read") == 0)
+ rw_func = ds4510_mem_read;
+ else if (strcmp(argv[3], "write") == 0)
+ rw_func = ds4510_mem_write;
+ else
+ break;
+
+ if (strcmp(argv[2], "eeprom") == 0) {
+ end = DS4510_EEPROM + DS4510_EEPROM_SIZE;
+ off += DS4510_EEPROM;
+ } else if (strcmp(argv[2], "seeprom") == 0) {
+ end = DS4510_SEEPROM + DS4510_SEEPROM_SIZE;
+ off += DS4510_SEEPROM;
+ } else if (strcmp(argv[2], "sram") == 0) {
+ end = DS4510_SRAM + DS4510_SRAM_SIZE;
+ off += DS4510_SRAM;
+ } else {
+ break;
+ }
+
+ if ((off + cnt) > end) {
+ printf("ERROR: invalid len\n");
+ return -1;
+ }
+
+ return rw_func(chip, off, (uint8_t *)addr, cnt);
+ default:
+ break;
+ }
+
+ printf("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+}
+
+U_BOOT_CMD(
+ ds4510, 7, 2, do_ds4510,
+ "ds4510 - ds4510 eeprom/seeprom/sram/gpio access\n",
+ "chip info\n"
+ " - display ds4510 info\n"
+ "ds4510 chip nv 0|1\n"
+ " - make gpio and seeprom writes volatile/non-volatile\n"
+ "ds4510 chip rstdelay 0-3\n"
+ " - set reset output delay\n"
+ "ds4510 chip output pin 0|1\n"
+ " - set pin low or high-Z\n"
+ "ds4510 chip input pin\n"
+ " - read value of pin\n"
+ "ds4510 chip pullup pin 0|1\n"
+ " - disable/enable pullup on specified pin\n"
+ "ds4510 chip eeprom read addr off cnt\n"
+ "ds4510 chip eeprom write addr off cnt\n"
+ " - read/write 'cnt' bytes at EEPROM offset 'off'\n"
+ "ds4510 chip seeprom read addr off cnt\n"
+ "ds4510 chip seeprom write addr off cnt\n"
+ " - read/write 'cnt' bytes at SRAM-shadowed EEPROM offset 'off'\n"
+ "ds4510 chip sram read addr off cnt\n"
+ "ds4510 chip sram write addr off cnt\n"
+ " - read/write 'cnt' bytes at SRAM offset 'off'\n"
+);
+#endif /* CONFIG_CMD_DS4510 */
diff --git a/include/gpio/ds4510.h b/include/gpio/ds4510.h
new file mode 100644
index 0000000..40480af
--- /dev/null
+++ b/include/gpio/ds4510.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2008 Extreme Engineering Solutions, 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
+ */
+
+#ifndef __DS4510_H_
+#define __DS4510_H_
+
+/* General defines */
+#define DS4510_NUM_IO 0x04
+#define DS4510_IO_MASK ((1 << DS4510_NUM_IO) - 1)
+#define DS4510_EEPROM_PAGE_WRITE_DELAY_MS 20
+
+/* EEPROM from 0x00 - 0x39 */
+#define DS4510_EEPROM 0x00
+#define DS4510_EEPROM_SIZE 0x40
+#define DS4510_EEPROM_PAGE_SIZE 0x08
+#define DS4510_EEPROM_PAGE_OFFSET(x) ((x) & (DS4510_EEPROM_PAGE_SIZE - 1))
+
+/* SEEPROM from 0xf0 - 0xf7 */
+#define DS4510_SEEPROM 0xf0
+#define DS4510_SEEPROM_SIZE 0x08
+
+/* Registers overlapping SEEPROM from 0xf0 - 0xf7 */
+#define DS4510_PULLUP 0xF0
+#define DS4510_PULLUP_DIS 0x00
+#define DS4510_PULLUP_EN 0x01
+#define DS4510_RSTDELAY 0xF1
+#define DS4510_RSTDELAY_MASK 0x03
+#define DS4510_RSTDELAY_125 0x00
+#define DS4510_RSTDELAY_250 0x01
+#define DS4510_RSTDELAY_500 0x02
+#define DS4510_RSTDELAY_1000 0x03
+#define DS4510_IO3 0xF4
+#define DS4510_IO2 0xF5
+#define DS4510_IO1 0xF6
+#define DS4510_IO0 0xF7
+
+/* Status configuration registers from 0xf8 - 0xf9*/
+#define DS4510_IO_STATUS 0xF8
+#define DS4510_CFG 0xF9
+#define DS4510_CFG_READY 0x80
+#define DS4510_CFG_TRIP_POINT 0x40
+#define DS4510_CFG_RESET 0x20
+#define DS4510_CFG_SEE 0x10
+#define DS4510_CFG_SWRST 0x08
+
+/* SRAM from 0xfa - 0xff */
+#define DS4510_SRAM 0xfa
+#define DS4510_SRAM_SIZE 0x06
+
+int ds4510_mem_write(uint8_t chip, int offset, uint8_t *buf, int count);
+int ds4510_mem_read(uint8_t chip, int offset, uint8_t *buf, int count);
+int ds4510_see_write(uint8_t chip, uint8_t nv);
+int ds4510_rstdelay_write(uint8_t chip, uint8_t delay);
+int ds4510_pullup_write(uint8_t chip, uint8_t val);
+int ds4510_pullup_read(uint8_t chip);
+int ds4510_gpio_write(uint8_t chip, uint8_t val);
+int ds4510_gpio_read(uint8_t chip);
+int ds4510_gpio_read_val(uint8_t chip);
+
+#endif /* __DS4510_H_ */
--
1.6.0.2.GIT
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