diff options
| -rw-r--r-- | drivers/i2c/Makefile | 3 | ||||
| -rw-r--r-- | drivers/i2c/designware_i2c.c (renamed from drivers/i2c/spr_i2c.c) | 15 | ||||
| -rw-r--r-- | drivers/i2c/designware_i2c.h (renamed from arch/arm/include/asm/arch-spear/spr_i2c.h) | 6 | ||||
| -rw-r--r-- | drivers/i2c/sh_sh7734_i2c.c | 387 | ||||
| -rw-r--r-- | include/configs/spear-common.h | 2 |
5 files changed, 406 insertions, 7 deletions
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index f86e46c11..5dbdbe367 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -27,6 +27,7 @@ LIB := $(obj)libi2c.o COBJS-$(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-$(CONFIG_I2C_MV) += mv_i2c.o @@ -40,11 +41,11 @@ COBJS-$(CONFIG_PPC4XX_I2C) += ppc4xx_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-$(CONFIG_U8500_I2C) += u8500_i2c.o COBJS-$(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/spr_i2c.c b/drivers/i2c/designware_i2c.c index eabfe843f..6d118acec 100644 --- a/drivers/i2c/spr_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -24,7 +24,7 @@ #include <common.h> #include <asm/io.h> #include <asm/arch/hardware.h> -#include <asm/arch/spr_i2c.h> +#include "designware_i2c.h" static struct i2c_regs *const i2c_regs_p = (struct i2c_regs *)CONFIG_SYS_I2C_BASE; @@ -40,6 +40,13 @@ static void set_speed(int i2c_spd) unsigned int cntl; unsigned int hcnt, lcnt; unsigned int high, low; + unsigned int enbl; + + /* to set speed cltr must be disabled */ + enbl = readl(&i2c_regs_p->ic_enable); + enbl &= ~IC_ENABLE_0B; + writel(enbl, &i2c_regs_p->ic_enable); + cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK)); @@ -71,6 +78,10 @@ static void set_speed(int i2c_spd) lcnt = (IC_CLK * low) / NANO_TO_MICRO; writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt); + + /* re-enable i2c ctrl back now that speed is set */ + enbl |= IC_ENABLE_0B; + writel(enbl, &i2c_regs_p->ic_enable); } /* @@ -113,7 +124,7 @@ int i2c_get_bus_speed(void) /* * i2c_init - Init function * @speed: required i2c speed - * @slaveadd: slave address for the spear device + * @slaveadd: slave address for the device * * Initialization function. */ diff --git a/arch/arm/include/asm/arch-spear/spr_i2c.h b/drivers/i2c/designware_i2c.h index 7521ebc6c..03b520ed4 100644 --- a/arch/arm/include/asm/arch-spear/spr_i2c.h +++ b/drivers/i2c/designware_i2c.h @@ -21,8 +21,8 @@ * MA 02111-1307 USA */ -#ifndef __SPR_I2C_H_ -#define __SPR_I2C_H_ +#ifndef __DW_I2C_H_ +#define __DW_I2C_H_ struct i2c_regs { u32 ic_con; @@ -143,4 +143,4 @@ struct i2c_regs { #define I2C_FAST_SPEED 400000 #define I2C_STANDARD_SPEED 100000 -#endif /* __SPR_I2C_H_ */ +#endif /* __DW_I2C_H_ */ diff --git a/drivers/i2c/sh_sh7734_i2c.c b/drivers/i2c/sh_sh7734_i2c.c new file mode 100644 index 000000000..9da173d31 --- /dev/null +++ b/drivers/i2c/sh_sh7734_i2c.c @@ -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); +} diff --git a/include/configs/spear-common.h b/include/configs/spear-common.h index 5fef8cce8..a79181565 100644 --- a/include/configs/spear-common.h +++ b/include/configs/spear-common.h @@ -41,7 +41,7 @@ /* 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 |