[U-Boot] [PATCH v3 2/3] Add support for Maxim's DS4510 I2C device
Peter Tyser
ptyser at xes-inc.com
Wed Nov 26 18:12:04 CET 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. The additional
CONFIG_DS4510_INFO, CONFIG_DS4510_MEM, and
CONFIG_DS4510_RST defines add additional sub-commands
to the ds4510 command when defined.
Signed-off-by: Peter Tyser <ptyser at xes-inc.com>
---
README | 4 +
drivers/misc/Makefile | 1 +
drivers/misc/ds4510.c | 400 +++++++++++++++++++++++++++++++++++++++++++++++++
include/gpio/ds4510.h | 75 +++++++++
4 files changed, 480 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/ds4510.c
create mode 100644 include/gpio/ds4510.h
diff --git a/README b/README
index bca8061..cea057d 100644
--- a/README
+++ b/README
@@ -574,6 +574,10 @@ 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 commands
+ CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
+ CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
+ CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
CONFIG_CMD_DTT * Digital Therm and Thermostat
CONFIG_CMD_ECHO echo arguments
CONFIG_CMD_EEPROM * EEPROM read/write support
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 01e0f39..ea2bf87 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libmisc.a
COBJS-$(CONFIG_ALI152X) += ali512x.o
+COBJS-$(CONFIG_DS4510) += ds4510.o
COBJS-$(CONFIG_FSL_LAW) += fsl_law.o
COBJS-$(CONFIG_NS87308) += ns87308.o
COBJS-$(CONFIG_STATUS_LED) += status_led.o
diff --git a/drivers/misc/ds4510.c b/drivers/misc/ds4510.c
new file mode 100644
index 0000000..572dcb7
--- /dev/null
+++ b/drivers/misc/ds4510.c
@@ -0,0 +1,400 @@
+/*
+ * 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>
+
+/* Default to an address that hopefully won't corrupt other i2c devices */
+#ifndef CONFIG_SYS_I2C_DS4510_ADDR
+#define CONFIG_SYS_I2C_DS4510_ADDR (~0)
+#endif
+
+enum {
+ DS4510_CMD_INFO,
+ DS4510_CMD_DEVICE,
+ DS4510_CMD_NV,
+ DS4510_CMD_RSTDELAY,
+ DS4510_CMD_OUTPUT,
+ DS4510_CMD_INPUT,
+ DS4510_CMD_PULLUP,
+ DS4510_CMD_EEPROM,
+ DS4510_CMD_SEEPROM,
+ DS4510_CMD_SRAM,
+};
+
+/*
+ * 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;
+}
+
+#ifdef CONFIG_CMD_DS4510
+#ifdef CONFIG_CMD_DS4510_INFO
+/*
+ * 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;
+}
+#endif /* CONFIG_CMD_DS4510_INFO */
+
+/* Use 'maxargs' field as minimum number of args to ease error checking */
+cmd_tbl_t cmd_ds4510[] = {
+ U_BOOT_CMD_MKENT(device, 2, 0, (void *)DS4510_CMD_DEVICE, "", ""),
+ U_BOOT_CMD_MKENT(nv, 3, 0, (void *)DS4510_CMD_NV, "", ""),
+ U_BOOT_CMD_MKENT(output, 4, 0, (void *)DS4510_CMD_OUTPUT, "", ""),
+ U_BOOT_CMD_MKENT(input, 3, 0, (void *)DS4510_CMD_INPUT, "", ""),
+ U_BOOT_CMD_MKENT(pullup, 4, 0, (void *)DS4510_CMD_PULLUP, "", ""),
+#ifdef CONFIG_CMD_DS4510_INFO
+ U_BOOT_CMD_MKENT(info, 2, 0, (void *)DS4510_CMD_INFO, "", ""),
+#endif
+#ifdef CONFIG_CMD_DS4510_RST
+ U_BOOT_CMD_MKENT(rstdelay, 3, 0, (void *)DS4510_CMD_RSTDELAY, "", ""),
+#endif
+#ifdef CONFIG_CMD_DS4510_MEM
+ U_BOOT_CMD_MKENT(eeprom, 6, 0, (void *)DS4510_CMD_EEPROM, "", ""),
+ U_BOOT_CMD_MKENT(seeprom, 6, 0, (void *)DS4510_CMD_SEEPROM, "", ""),
+ U_BOOT_CMD_MKENT(sram, 6, 0, (void *)DS4510_CMD_SRAM, "", ""),
+#endif
+};
+
+int do_ds4510(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ static uint8_t chip = CONFIG_SYS_I2C_DS4510_ADDR;
+ cmd_tbl_t *c;
+ ulong ul_arg2;
+ ulong ul_arg3;
+ int tmp;
+#ifdef CONFIG_CMD_DS4510_MEM
+ ulong addr;
+ ulong off;
+ ulong cnt;
+ int end;
+ int (*rw_func)(uint8_t, int, uint8_t *, int);
+#endif
+
+ c = find_cmd_tbl(argv[1], cmd_ds4510, ARRAY_SIZE(cmd_ds4510));
+ if (!c || (argc < c->maxargs)) {
+ printf("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+ /* arg2 used as chip addr and pin number */
+ ul_arg2 = simple_strtoul(argv[2], NULL, 16);
+
+ /* arg3 used as output/pullup value */
+ ul_arg3 = simple_strtoul(argv[3], NULL, 16);
+
+ switch ((int)c->cmd) {
+ case DS4510_CMD_DEVICE:
+ if (argc >= 3)
+ chip = ul_arg2;
+ printf("Current device address: 0x%x\n", chip);
+ return 0;
+ case DS4510_CMD_NV:
+ return ds4510_see_write(chip, ul_arg2);
+ case DS4510_CMD_OUTPUT:
+ tmp = ds4510_gpio_read(chip);
+ if (ul_arg3)
+ tmp |= (1 << ul_arg2);
+ else
+ tmp &= ~(1 << ul_arg2);
+ return ds4510_gpio_write(chip, tmp);
+ case DS4510_CMD_INPUT:
+ return (ds4510_gpio_read_val(chip) & (1 << ul_arg2)) != 0;
+ case DS4510_CMD_PULLUP:
+ tmp = ds4510_pullup_read(chip);
+ if (ul_arg3)
+ tmp |= (1 << ul_arg2);
+ else
+ tmp &= ~(1 << ul_arg2);
+ return ds4510_pullup_write(chip, tmp);
+#ifdef CONFIG_CMD_DS4510_INFO
+ case DS4510_CMD_INFO:
+ return ds4510_info(chip);
+#endif
+#ifdef CONFIG_CMD_DS4510_RST
+ case DS4510_CMD_RSTDELAY:
+ return ds4510_rstdelay_write(chip, ul_arg2);
+#endif
+#ifdef CONFIG_CMD_DS4510_MEM
+ case DS4510_CMD_EEPROM:
+ end = DS4510_EEPROM + DS4510_EEPROM_SIZE;
+ off = DS4510_EEPROM;
+ break;
+ case DS4510_CMD_SEEPROM:
+ end = DS4510_SEEPROM + DS4510_SEEPROM_SIZE;
+ off = DS4510_SEEPROM;
+ break;
+ case DS4510_CMD_SRAM:
+ end = DS4510_SRAM + DS4510_SRAM_SIZE;
+ off = DS4510_SRAM;
+ break;
+#endif
+ default:
+ printf("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+#ifdef CONFIG_CMD_DS4510_MEM
+ /* Only eeprom, seeprom, and sram commands should make it here */
+ if (strcmp(argv[2], "read") == 0) {
+ rw_func = ds4510_mem_read;
+ } else if (strcmp(argv[2], "write") == 0) {
+ rw_func = ds4510_mem_write;
+ } else {
+ printf("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+ addr = simple_strtoul(argv[3], NULL, 16);
+ off += simple_strtoul(argv[4], NULL, 16);
+ cnt = simple_strtoul(argv[5], NULL, 16);
+
+ if ((off + cnt) > end) {
+ printf("ERROR: invalid len\n");
+ return -1;
+ }
+
+ return rw_func(chip, off, (uint8_t *)addr, cnt);
+#endif
+}
+
+U_BOOT_CMD(
+ ds4510, 6, 1, do_ds4510,
+ "ds4510 - ds4510 eeprom/seeprom/sram/gpio access\n",
+ "device [dev]\n"
+ " - show or set current device address\n"
+#ifdef CONFIG_CMD_DS4510_INFO
+ "ds4510 info\n"
+ " - display ds4510 info\n"
+#endif
+ "ds4510 output pin 0|1\n"
+ " - set pin low or high-Z\n"
+ "ds4510 input pin\n"
+ " - read value of pin\n"
+ "ds4510 pullup pin 0|1\n"
+ " - disable/enable pullup on specified pin\n"
+ "ds4510 nv 0|1\n"
+ " - make gpio and seeprom writes volatile/non-volatile\n"
+#ifdef CONFIG_CMD_DS4510_RST
+ "ds4510 rstdelay 0-3\n"
+ " - set reset output delay\n"
+#endif
+#ifdef CONFIG_CMD_DS4510_MEM
+ "ds4510 eeprom read addr off cnt\n"
+ "ds4510 eeprom write addr off cnt\n"
+ " - read/write 'cnt' bytes at EEPROM offset 'off'\n"
+ "ds4510 seeprom read addr off cnt\n"
+ "ds4510 seeprom write addr off cnt\n"
+ " - read/write 'cnt' bytes at SRAM-shadowed EEPROM offset 'off'\n"
+ "ds4510 sram read addr off cnt\n"
+ "ds4510 sram write addr off cnt\n"
+ " - read/write 'cnt' bytes at SRAM offset 'off'\n"
+#endif
+);
+#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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