sh: i2c: Add support I2C controller of SH7734
authorNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Thu, 1 Mar 2012 17:56:35 +0000 (17:56 +0000)
committerHeiko Schocher <hs@denx.de>
Tue, 24 Apr 2012 07:40:04 +0000 (09:40 +0200)
Renesas SH7734 has two I2C interfaceis.
This supports these I2C.

V5: - include i2c.h.
    - Add check of icsr bit polling logic.
- Implement i2c_probe.
V4: - Remove sh_i2c_dump_reg function.
    - Use puts() when there's no format.
    - Chnage check for I2C bus number.
    - Remove space before the semi-colon.
V3: - Fix error for whitespace.
V2: - Changed bit control to use the clr|set|clrsetbits_* functions.
    - Fix wrong comment style.
    - Add new line before for loop in i2c_read.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Acked-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
drivers/i2c/Makefile
drivers/i2c/sh_sh7734_i2c.c [new file with mode: 0644]

index f86e46c111fc4357ab888bacfa04dc2793fd04df..42913f7cbb7e1b2e0dcdc6eb01f9805bfaaeaba1 100644 (file)
@@ -45,6 +45,7 @@ COBJS-$(CONFIG_TEGRA_I2C) += tegra_i2c.o
 COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
 COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
 COBJS-$(CONFIG_SH_I2C) += sh_i2c.o
+COBJS-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o
 
 COBJS  := $(COBJS-y)
 SRCS   := $(COBJS:.o=.c)
diff --git a/drivers/i2c/sh_sh7734_i2c.c b/drivers/i2c/sh_sh7734_i2c.c
new file mode 100644 (file)
index 0000000..9da173d
--- /dev/null
@@ -0,0 +1,387 @@
+/*
+ * Copyright (C) 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ *
+ * 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 <i2c.h>
+#include <asm/io.h>
+
+struct sh_i2c {
+       u8 iccr1;
+       u8 iccr2;
+       u8 icmr;
+       u8 icier;
+       u8 icsr;
+       u8 sar;
+       u8 icdrt;
+       u8 icdrr;
+       u8 nf2cyc;
+       u8 __pad0;
+       u8 __pad1;
+};
+
+static struct sh_i2c *base;
+static u8 iccr1_cks, nf2cyc;
+
+/* ICCR1 */
+#define SH_I2C_ICCR1_ICE       (1 << 7)
+#define SH_I2C_ICCR1_RCVD      (1 << 6)
+#define SH_I2C_ICCR1_MST       (1 << 5)
+#define SH_I2C_ICCR1_TRS       (1 << 4)
+#define SH_I2C_ICCR1_MTRS      \
+       (SH_I2C_ICCR1_MST | SH_I2C_ICCR1_TRS)
+
+/* ICCR1 */
+#define SH_I2C_ICCR2_BBSY      (1 << 7)
+#define SH_I2C_ICCR2_SCP       (1 << 6)
+#define SH_I2C_ICCR2_SDAO      (1 << 5)
+#define SH_I2C_ICCR2_SDAOP     (1 << 4)
+#define SH_I2C_ICCR2_SCLO      (1 << 3)
+#define SH_I2C_ICCR2_IICRST    (1 << 1)
+
+#define SH_I2C_ICIER_TIE       (1 << 7)
+#define SH_I2C_ICIER_TEIE      (1 << 6)
+#define SH_I2C_ICIER_RIE       (1 << 5)
+#define SH_I2C_ICIER_NAKIE     (1 << 4)
+#define SH_I2C_ICIER_STIE      (1 << 3)
+#define SH_I2C_ICIER_ACKE      (1 << 2)
+#define SH_I2C_ICIER_ACKBR     (1 << 1)
+#define SH_I2C_ICIER_ACKBT     (1 << 0)
+
+#define SH_I2C_ICSR_TDRE       (1 << 7)
+#define SH_I2C_ICSR_TEND       (1 << 6)
+#define SH_I2C_ICSR_RDRF       (1 << 5)
+#define SH_I2C_ICSR_NACKF      (1 << 4)
+#define SH_I2C_ICSR_STOP       (1 << 3)
+#define SH_I2C_ICSR_ALOVE      (1 << 2)
+#define SH_I2C_ICSR_AAS                (1 << 1)
+#define SH_I2C_ICSR_ADZ                (1 << 0)
+
+#define IRQ_WAIT 1000
+
+static void sh_i2c_send_stop(struct sh_i2c *base)
+{
+       clrbits_8(&base->iccr2, SH_I2C_ICCR2_BBSY | SH_I2C_ICCR2_SCP);
+}
+
+static int check_icsr_bits(struct sh_i2c *base, u8 bits)
+{
+       int i;
+
+       for (i = 0; i < IRQ_WAIT; i++) {
+               if (bits & readb(&base->icsr))
+                       return 0;
+               udelay(10);
+       }
+
+       return 1;
+}
+
+static int check_stop(struct sh_i2c *base)
+{
+       int ret = check_icsr_bits(base, SH_I2C_ICSR_STOP);
+       clrbits_8(&base->icsr, SH_I2C_ICSR_STOP);
+
+       return ret;
+}
+
+static int check_tend(struct sh_i2c *base, int stop)
+{
+       int ret = check_icsr_bits(base, SH_I2C_ICSR_TEND);
+
+       if (stop) {
+               clrbits_8(&base->icsr, SH_I2C_ICSR_STOP);
+               sh_i2c_send_stop(base);
+       }
+
+       clrbits_8(&base->icsr, SH_I2C_ICSR_TEND);
+       return ret;
+}
+
+static int check_tdre(struct sh_i2c *base)
+{
+       return check_icsr_bits(base, SH_I2C_ICSR_TDRE);
+}
+
+static int check_rdrf(struct sh_i2c *base)
+{
+       return check_icsr_bits(base, SH_I2C_ICSR_RDRF);
+}
+
+static int check_bbsy(struct sh_i2c *base)
+{
+       int i;
+
+       for (i = 0 ; i < IRQ_WAIT ; i++) {
+               if (!(SH_I2C_ICCR2_BBSY & readb(&base->iccr2)))
+                       return 0;
+               udelay(10);
+       }
+       return 1;
+}
+
+static int check_ackbr(struct sh_i2c *base)
+{
+       int i;
+
+       for (i = 0 ; i < IRQ_WAIT ; i++) {
+               if (!(SH_I2C_ICIER_ACKBR & readb(&base->icier)))
+                       return 0;
+               udelay(10);
+       }
+
+       return 1;
+}
+
+static void sh_i2c_reset(struct sh_i2c *base)
+{
+       setbits_8(&base->iccr2, SH_I2C_ICCR2_IICRST);
+
+       udelay(100);
+
+       clrbits_8(&base->iccr2, SH_I2C_ICCR2_IICRST);
+}
+
+static int i2c_set_addr(struct sh_i2c *base, u8 id, u8 reg)
+{
+       if (check_bbsy(base)) {
+               puts("i2c bus busy\n");
+               goto fail;
+       }
+
+       setbits_8(&base->iccr1, SH_I2C_ICCR1_MTRS);
+       clrsetbits_8(&base->iccr2, SH_I2C_ICCR2_SCP, SH_I2C_ICCR2_BBSY);
+
+       writeb((id << 1), &base->icdrt);
+
+       if (check_tend(base, 0)) {
+               puts("TEND check fail...\n");
+               goto fail;
+       }
+
+       if (check_ackbr(base)) {
+               check_tend(base, 0);
+               sh_i2c_send_stop(base);
+               goto fail;
+       }
+
+       writeb(reg, &base->icdrt);
+
+       if (check_tdre(base)) {
+               puts("TDRE check fail...\n");
+               goto fail;
+       }
+
+       if (check_tend(base, 0)) {
+               puts("TEND check fail...\n");
+               goto fail;
+       }
+
+       return 0;
+fail:
+
+       return 1;
+}
+
+static int
+i2c_raw_write(struct sh_i2c *base, u8 id, u8 reg, u8 *val, int size)
+{
+       int i;
+
+       if (i2c_set_addr(base, id, reg)) {
+               puts("Fail set slave address\n");
+               return 1;
+       }
+
+       for (i = 0; i < size; i++) {
+               writeb(val[i], &base->icdrt);
+               check_tdre(base);
+       }
+
+       check_tend(base, 1);
+       check_stop(base);
+
+       udelay(100);
+
+       clrbits_8(&base->iccr1, SH_I2C_ICCR1_MTRS);
+       clrbits_8(&base->icsr, SH_I2C_ICSR_TDRE);
+       sh_i2c_reset(base);
+
+       return 0;
+}
+
+static u8 i2c_raw_read(struct sh_i2c *base, u8 id, u8 reg)
+{
+       u8 ret = 0;
+
+       if (i2c_set_addr(base, id, reg)) {
+               puts("Fail set slave address\n");
+               goto fail;
+       }
+
+       clrsetbits_8(&base->iccr2, SH_I2C_ICCR2_SCP, SH_I2C_ICCR2_BBSY);
+       writeb((id << 1) | 1, &base->icdrt);
+
+       if (check_tend(base, 0))
+               puts("TDRE check fail...\n");
+
+       clrsetbits_8(&base->iccr1, SH_I2C_ICCR1_TRS, SH_I2C_ICCR1_MST);
+       clrbits_8(&base->icsr, SH_I2C_ICSR_TDRE);
+       setbits_8(&base->icier, SH_I2C_ICIER_ACKBT);
+       setbits_8(&base->iccr1, SH_I2C_ICCR1_RCVD);
+
+       /* read data (dummy) */
+       ret = readb(&base->icdrr);
+
+       if (check_rdrf(base)) {
+               puts("check RDRF error\n");
+               goto fail;
+       }
+
+       clrbits_8(&base->icsr, SH_I2C_ICSR_STOP);
+       udelay(1000);
+
+       sh_i2c_send_stop(base);
+
+       if (check_stop(base)) {
+               puts("check STOP error\n");
+               goto fail;
+       }
+
+       clrbits_8(&base->iccr1, SH_I2C_ICCR1_MTRS);
+       clrbits_8(&base->icsr, SH_I2C_ICSR_TDRE);
+
+       /* data read */
+       ret = readb(&base->icdrr);
+
+fail:
+       clrbits_8(&base->iccr1, SH_I2C_ICCR1_RCVD);
+
+       return ret;
+}
+
+#ifdef CONFIG_I2C_MULTI_BUS
+static unsigned int current_bus;
+
+/**
+ * i2c_set_bus_num - change active I2C bus
+ *     @bus: bus index, zero based
+ *     @returns: 0 on success, non-0 on failure
+ */
+int i2c_set_bus_num(unsigned int bus)
+{
+       switch (bus) {
+       case 0:
+               base = (void *)CONFIG_SH_I2C_BASE0;
+               break;
+       case 1:
+               base = (void *)CONFIG_SH_I2C_BASE1;
+               break;
+       default:
+               printf("Bad bus: %d\n", bus);
+               return -1;
+       }
+
+       current_bus = bus;
+
+       return 0;
+}
+
+/**
+ * i2c_get_bus_num - returns index of active I2C bus
+ */
+unsigned int i2c_get_bus_num(void)
+{
+       return current_bus;
+}
+#endif
+
+void i2c_init(int speed, int slaveaddr)
+{
+#ifdef CONFIG_I2C_MULTI_BUS
+       current_bus = 0;
+#endif
+       base = (struct sh_i2c *)CONFIG_SH_I2C_BASE0;
+
+       if (speed == 400000)
+               iccr1_cks = 0x07;
+       else
+               iccr1_cks = 0x0F;
+
+       nf2cyc = 1;
+
+       /* Reset */
+       sh_i2c_reset(base);
+
+       /* ICE enable and set clock */
+       writeb(SH_I2C_ICCR1_ICE | iccr1_cks, &base->iccr1);
+       writeb(nf2cyc, &base->nf2cyc);
+}
+
+/*
+ * i2c_read: - Read multiple bytes from an i2c device
+ *
+ * The higher level routines take into account that this function is only
+ * called with len < page length of the device (see configuration file)
+ *
+ * @chip:   address of the chip which is to be read
+ * @addr:   i2c data address within the chip
+ * @alen:   length of the i2c data address (1..2 bytes)
+ * @buffer: where to write the data
+ * @len:    how much byte do we want to read
+ * @return: 0 in case of success
+ */
+int i2c_read(u8 chip, u32 addr, int alen, u8 *buffer, int len)
+{
+       int i = 0;
+       for (i = 0; i < len; i++)
+               buffer[i] = i2c_raw_read(base, chip, addr + i);
+
+       return 0;
+}
+
+/*
+ * i2c_write: -  Write multiple bytes to an i2c device
+ *
+ * The higher level routines take into account that this function is only
+ * called with len < page length of the device (see configuration file)
+ *
+ * @chip:   address of the chip which is to be written
+ * @addr:   i2c data address within the chip
+ * @alen:   length of the i2c data address (1..2 bytes)
+ * @buffer: where to find the data to be written
+ * @len:    how much byte do we want to read
+ * @return: 0 in case of success
+ */
+int i2c_write(u8 chip, u32 addr, int alen, u8 *buffer, int len)
+{
+       return i2c_raw_write(base, chip, addr, buffer, len);
+}
+
+/*
+ * i2c_probe: - Test if a chip answers for a given i2c address
+ *
+ * @chip:   address of the chip which is searched for
+ * @return: 0 if a chip was found, -1 otherwhise
+ */
+int i2c_probe(u8 chip)
+{
+       u8 byte;
+       return i2c_read(chip, 0, 0, &byte, 1);
+}