diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/Makefile | 69 | ||||
| -rw-r--r-- | drivers/i2c/i2c_core.c | 39 | ||||
| -rw-r--r-- | drivers/i2c/mxc_i2c.c | 137 | ||||
| -rw-r--r-- | drivers/i2c/rcar_i2c.c | 288 | ||||
| -rw-r--r-- | drivers/i2c/s3c24x0_i2c.c | 835 | ||||
| -rw-r--r-- | drivers/i2c/s3c24x0_i2c.h | 38 | ||||
| -rw-r--r-- | drivers/i2c/sh_i2c.c | 10 |
7 files changed, 1126 insertions, 290 deletions
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index df3092eaf..5280bb3fe 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -5,48 +5,27 @@ # SPDX-License-Identifier: GPL-2.0+ # -include $(TOPDIR)/config.mk - -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-$(CONFIG_I2C_MVTWSI) += mvtwsi.o -COBJS-$(CONFIG_I2C_MV) += mv_i2c.o -COBJS-$(CONFIG_I2C_MXC) += mxc_i2c.o -COBJS-$(CONFIG_I2C_MXS) += mxs_i2c.o -COBJS-$(CONFIG_DRIVER_OMAP1510_I2C) += omap1510_i2c.o -COBJS-$(CONFIG_DRIVER_OMAP24XX_I2C) += omap24xx_i2c.o -COBJS-$(CONFIG_DRIVER_OMAP34XX_I2C) += omap24xx_i2c.o -COBJS-$(CONFIG_PCA9564_I2C) += pca9564_i2c.o -COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o -COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o -COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o -COBJS-$(CONFIG_SH_I2C) += sh_i2c.o -COBJS-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o -COBJS-$(CONFIG_SYS_I2C) += i2c_core.o -COBJS-$(CONFIG_SYS_I2C_FSL) += fsl_i2c.o -COBJS-$(CONFIG_SYS_I2C_FTI2C010) += fti2c010.o -COBJS-$(CONFIG_SYS_I2C_PPC4XX) += ppc4xx_i2c.o -COBJS-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o -COBJS-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o -COBJS-$(CONFIG_ZYNQ_I2C) += zynq_i2c.o - -COBJS := $(COBJS-y) -SRCS := $(COBJS:.o=.c) -OBJS := $(addprefix $(obj),$(COBJS)) - -all: $(LIB) - -$(LIB): $(obj).depend $(OBJS) - $(call cmd_link_o_target, $(OBJS)) - -######################################################################### - -# defines $(obj).depend target -include $(SRCTREE)/rules.mk - -sinclude $(obj).depend - -######################################################################### +obj-$(CONFIG_BFIN_TWI_I2C) += bfin-twi_i2c.o +obj-$(CONFIG_DRIVER_DAVINCI_I2C) += davinci_i2c.o +obj-$(CONFIG_DW_I2C) += designware_i2c.o +obj-$(CONFIG_I2C_MVTWSI) += mvtwsi.o +obj-$(CONFIG_I2C_MV) += mv_i2c.o +obj-$(CONFIG_I2C_MXS) += mxs_i2c.o +obj-$(CONFIG_DRIVER_OMAP1510_I2C) += omap1510_i2c.o +obj-$(CONFIG_DRIVER_OMAP24XX_I2C) += omap24xx_i2c.o +obj-$(CONFIG_DRIVER_OMAP34XX_I2C) += omap24xx_i2c.o +obj-$(CONFIG_PCA9564_I2C) += pca9564_i2c.o +obj-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o +obj-$(CONFIG_TSI108_I2C) += tsi108_i2c.o +obj-$(CONFIG_U8500_I2C) += u8500_i2c.o +obj-$(CONFIG_SH_I2C) += sh_i2c.o +obj-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o +obj-$(CONFIG_SYS_I2C) += i2c_core.o +obj-$(CONFIG_SYS_I2C_FSL) += fsl_i2c.o +obj-$(CONFIG_SYS_I2C_FTI2C010) += fti2c010.o +obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o +obj-$(CONFIG_SYS_I2C_PPC4XX) += ppc4xx_i2c.o +obj-$(CONFIG_SYS_I2C_RCAR) += rcar_i2c.o +obj-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o +obj-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o +obj-$(CONFIG_ZYNQ_I2C) += zynq_i2c.o diff --git a/drivers/i2c/i2c_core.c b/drivers/i2c/i2c_core.c index d1072e819..e1767f4bd 100644 --- a/drivers/i2c/i2c_core.c +++ b/drivers/i2c/i2c_core.c @@ -53,32 +53,26 @@ void i2c_reloc_fixup(void) return; for (i = 0; i < max; i++) { - /* adapter itself */ - addr = (unsigned long)i2c_adap_p; - addr += gd->reloc_off; - i2c_adap_p = (struct i2c_adapter *)addr; /* i2c_init() */ addr = (unsigned long)i2c_adap_p->init; addr += gd->reloc_off; - i2c_adap_p->init = (void (*)(int, int))addr; + i2c_adap_p->init = (void *)addr; /* i2c_probe() */ addr = (unsigned long)i2c_adap_p->probe; addr += gd->reloc_off; - i2c_adap_p->probe = (int (*)(uint8_t))addr; + i2c_adap_p->probe = (void *)addr; /* i2c_read() */ addr = (unsigned long)i2c_adap_p->read; addr += gd->reloc_off; - i2c_adap_p->read = (int (*)(uint8_t, uint, int, uint8_t *, - int))addr; + i2c_adap_p->read = (void *)addr; /* i2c_write() */ addr = (unsigned long)i2c_adap_p->write; addr += gd->reloc_off; - i2c_adap_p->write = (int (*)(uint8_t, uint, int, uint8_t *, - int))addr; + i2c_adap_p->write = (void *)addr; /* i2c_set_bus_speed() */ addr = (unsigned long)i2c_adap_p->set_bus_speed; addr += gd->reloc_off; - i2c_adap_p->set_bus_speed = (uint (*)(uint))addr; + i2c_adap_p->set_bus_speed = (void *)addr; /* name */ addr = (unsigned long)i2c_adap_p->name; addr += gd->reloc_off; @@ -138,6 +132,11 @@ static int i2c_mux_set(struct i2c_adapter *adap, int mux_id, int chip, return -1; buf = (uint8_t)((channel & 0x07) | (1 << 3)); break; + case I2C_MUX_PCA9548_ID: + if (channel > 7) + return -1; + buf = (uint8_t)(0x01 << channel); + break; default: printf("%s: wrong mux id: %d\n", __func__, mux_id); return -1; @@ -278,20 +277,22 @@ unsigned int i2c_get_bus_num(void) */ int i2c_set_bus_num(unsigned int bus) { - int max = ll_entry_count(struct i2c_adapter, i2c); + int max; + + if ((bus == I2C_BUS) && (I2C_ADAP->init_done > 0)) + return 0; - if (I2C_ADAPTER(bus) >= max) { - printf("Error, wrong i2c adapter %d max %d possible\n", - I2C_ADAPTER(bus), max); - return -2; - } #ifndef CONFIG_SYS_I2C_DIRECT_BUS if (bus >= CONFIG_SYS_NUM_I2C_BUSES) return -1; #endif - if ((bus == I2C_BUS) && (I2C_ADAP->init_done > 0)) - return 0; + max = ll_entry_count(struct i2c_adapter, i2c); + if (I2C_ADAPTER(bus) >= max) { + printf("Error, wrong i2c adapter %d max %d possible\n", + I2C_ADAPTER(bus), max); + return -2; + } #ifndef CONFIG_SYS_I2C_DIRECT_BUS i2c_mux_disconnet_all(); diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index 06ba4e39f..595019b3b 100644 --- a/drivers/i2c/mxc_i2c.c +++ b/drivers/i2c/mxc_i2c.c @@ -102,6 +102,28 @@ static u16 i2c_clk_div[50][2] = { }; #endif + +#ifndef CONFIG_SYS_MXC_I2C1_SPEED +#define CONFIG_SYS_MXC_I2C1_SPEED 100000 +#endif +#ifndef CONFIG_SYS_MXC_I2C2_SPEED +#define CONFIG_SYS_MXC_I2C2_SPEED 100000 +#endif +#ifndef CONFIG_SYS_MXC_I2C3_SPEED +#define CONFIG_SYS_MXC_I2C3_SPEED 100000 +#endif + +#ifndef CONFIG_SYS_MXC_I2C1_SLAVE +#define CONFIG_SYS_MXC_I2C1_SLAVE 0 +#endif +#ifndef CONFIG_SYS_MXC_I2C2_SLAVE +#define CONFIG_SYS_MXC_I2C2_SLAVE 0 +#endif +#ifndef CONFIG_SYS_MXC_I2C3_SLAVE +#define CONFIG_SYS_MXC_I2C3_SLAVE 0 +#endif + + /* * Calculate and set proper clock divider */ @@ -153,21 +175,6 @@ static int bus_i2c_set_bus_speed(void *base, int speed) return 0; } -/* - * Get I2C Speed - */ -static unsigned int bus_i2c_get_bus_speed(void *base) -{ - struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base; - u8 clk_idx = readb(&i2c_regs->ifdr); - u8 clk_div; - - for (clk_div = 0; i2c_clk_div[clk_div][1] != clk_idx; clk_div++) - ; - - return mxc_get_clock(MXC_I2C_CLK) / i2c_clk_div[clk_div][0]; -} - #define ST_BUS_IDLE (0 | (I2SR_IBB << 8)) #define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB << 8)) #define ST_IIF (I2SR_IIF | (I2SR_IIF << 8)) @@ -410,20 +417,30 @@ struct sram_data { */ static struct sram_data __attribute__((section(".data"))) srdata; -void *get_base(void) -{ -#ifdef CONFIG_SYS_I2C_BASE -#ifdef CONFIG_I2C_MULTI_BUS - void *ret = srdata.i2c_data[srdata.curr_i2c_bus].base; - if (ret) - return ret; -#endif - return (void *)CONFIG_SYS_I2C_BASE; -#elif defined(CONFIG_I2C_MULTI_BUS) - return srdata.i2c_data[srdata.curr_i2c_bus].base; +static void * const i2c_bases[] = { +#if defined(CONFIG_MX25) + (void *)IMX_I2C_BASE, + (void *)IMX_I2C2_BASE, + (void *)IMX_I2C3_BASE +#elif defined(CONFIG_MX27) + (void *)IMX_I2C1_BASE, + (void *)IMX_I2C2_BASE +#elif defined(CONFIG_MX31) || defined(CONFIG_MX35) || \ + defined(CONFIG_MX51) || defined(CONFIG_MX53) || \ + defined(CONFIG_MX6) + (void *)I2C1_BASE_ADDR, + (void *)I2C2_BASE_ADDR, + (void *)I2C3_BASE_ADDR +#elif defined(CONFIG_VF610) + (void *)I2C0_BASE_ADDR #else - return srdata.i2c_data[0].base; +#error "architecture not supported" #endif +}; + +void *i2c_get_base(struct i2c_adapter *adap) +{ + return i2c_bases[adap->hwadapnr]; } static struct i2c_parms *i2c_get_parms(void *base) @@ -448,39 +465,26 @@ static int i2c_idle_bus(void *base) return 0; } -#ifdef CONFIG_I2C_MULTI_BUS -unsigned int i2c_get_bus_num(void) -{ - return srdata.curr_i2c_bus; -} - -int i2c_set_bus_num(unsigned bus_idx) -{ - if (bus_idx >= ARRAY_SIZE(srdata.i2c_data)) - return -1; - if (!srdata.i2c_data[bus_idx].base) - return -1; - srdata.curr_i2c_bus = bus_idx; - return 0; -} -#endif - -int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) +static int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip, + uint addr, int alen, uint8_t *buffer, + int len) { - return bus_i2c_read(get_base(), chip, addr, alen, buf, len); + return bus_i2c_read(i2c_get_base(adap), chip, addr, alen, buffer, len); } -int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) +static int mxc_i2c_write(struct i2c_adapter *adap, uint8_t chip, + uint addr, int alen, uint8_t *buffer, + int len) { - return bus_i2c_write(get_base(), chip, addr, alen, buf, len); + return bus_i2c_write(i2c_get_base(adap), chip, addr, alen, buffer, len); } /* * Test if a chip at a given address responds (probe the chip) */ -int i2c_probe(uchar chip) +static int mxc_i2c_probe(struct i2c_adapter *adap, uint8_t chip) { - return bus_i2c_write(get_base(), chip, 0, 0, NULL, 0); + return bus_i2c_write(i2c_get_base(adap), chip, 0, 0, NULL, 0); } void bus_i2c_init(void *base, int speed, int unused, @@ -510,23 +514,38 @@ void bus_i2c_init(void *base, int speed, int unused, /* * Init I2C Bus */ -void i2c_init(int speed, int unused) +static void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) { - bus_i2c_init(get_base(), speed, unused, NULL, NULL); + bus_i2c_init(i2c_get_base(adap), speed, slaveaddr, NULL, NULL); } /* * Set I2C Speed */ -int i2c_set_bus_speed(unsigned int speed) +static uint mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed) { - return bus_i2c_set_bus_speed(get_base(), speed); + return bus_i2c_set_bus_speed(i2c_get_base(adap), speed); } /* - * Get I2C Speed + * Register mxc i2c adapters */ -unsigned int i2c_get_bus_speed(void) -{ - return bus_i2c_get_bus_speed(get_base()); -} +U_BOOT_I2C_ADAP_COMPLETE(mxc0, mxc_i2c_init, mxc_i2c_probe, + mxc_i2c_read, mxc_i2c_write, + mxc_i2c_set_bus_speed, + CONFIG_SYS_MXC_I2C1_SPEED, + CONFIG_SYS_MXC_I2C1_SLAVE, 0) +U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe, + mxc_i2c_read, mxc_i2c_write, + mxc_i2c_set_bus_speed, + CONFIG_SYS_MXC_I2C2_SPEED, + CONFIG_SYS_MXC_I2C2_SLAVE, 1) +#if defined(CONFIG_MX31) || defined(CONFIG_MX35) ||\ + defined(CONFIG_MX51) || defined(CONFIG_MX53) ||\ + defined(CONFIG_MX6) +U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe, + mxc_i2c_read, mxc_i2c_write, + mxc_i2c_set_bus_speed, + CONFIG_SYS_MXC_I2C3_SPEED, + CONFIG_SYS_MXC_I2C3_SLAVE, 2) +#endif diff --git a/drivers/i2c/rcar_i2c.c b/drivers/i2c/rcar_i2c.c new file mode 100644 index 000000000..ba2cadb17 --- /dev/null +++ b/drivers/i2c/rcar_i2c.c @@ -0,0 +1,288 @@ +/* + * drivers/i2c/rcar_i2c.c + * + * Copyright (C) 2013 Renesas Electronics Corporation + * Copyright (C) 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <i2c.h> +#include <asm/io.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct rcar_i2c { + u32 icscr; + u32 icmcr; + u32 icssr; + u32 icmsr; + u32 icsier; + u32 icmier; + u32 icccr; + u32 icsar; + u32 icmar; + u32 icrxdtxd; + u32 icccr2; + u32 icmpr; + u32 ichpr; + u32 iclpr; +}; + +#define MCR_MDBS 0x80 /* non-fifo mode switch */ +#define MCR_FSCL 0x40 /* override SCL pin */ +#define MCR_FSDA 0x20 /* override SDA pin */ +#define MCR_OBPC 0x10 /* override pins */ +#define MCR_MIE 0x08 /* master if enable */ +#define MCR_TSBE 0x04 +#define MCR_FSB 0x02 /* force stop bit */ +#define MCR_ESG 0x01 /* en startbit gen. */ + +#define MSR_MASK 0x7f +#define MSR_MNR 0x40 /* nack received */ +#define MSR_MAL 0x20 /* arbitration lost */ +#define MSR_MST 0x10 /* sent a stop */ +#define MSR_MDE 0x08 +#define MSR_MDT 0x04 +#define MSR_MDR 0x02 +#define MSR_MAT 0x01 /* slave addr xfer done */ + +static const struct rcar_i2c *i2c_dev[CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS] = { + (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C0_BASE, + (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C1_BASE, + (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C2_BASE, + (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C3_BASE, +}; + +static void rcar_i2c_raw_rw_common(struct rcar_i2c *dev, u8 chip, uint addr) +{ + /* set slave address */ + writel(chip << 1, &dev->icmar); + /* set register address */ + writel(addr, &dev->icrxdtxd); + /* clear status */ + writel(0, &dev->icmsr); + /* start master send */ + writel(MCR_MDBS | MCR_MIE | MCR_ESG, &dev->icmcr); + + while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDE)) + != (MSR_MAT | MSR_MDE)) + udelay(10); + + /* clear ESG */ + writel(MCR_MDBS | MCR_MIE, &dev->icmcr); + /* start SCLclk */ + writel(~(MSR_MAT | MSR_MDE), &dev->icmsr); + + while (!(readl(&dev->icmsr) & MSR_MDE)) + udelay(10); +} + +static void rcar_i2c_raw_rw_finish(struct rcar_i2c *dev) +{ + while (!(readl(&dev->icmsr) & MSR_MST)) + udelay(10); + + writel(0, &dev->icmcr); +} + +static int +rcar_i2c_raw_write(struct rcar_i2c *dev, u8 chip, uint addr, u8 *val, int size) +{ + rcar_i2c_raw_rw_common(dev, chip, addr); + + /* set send date */ + writel(*val, &dev->icrxdtxd); + /* start SCLclk */ + writel(~MSR_MDE, &dev->icmsr); + + while (!(readl(&dev->icmsr) & MSR_MDE)) + udelay(10); + + /* set stop condition */ + writel(MCR_MDBS | MCR_MIE | MCR_FSB, &dev->icmcr); + /* start SCLclk */ + writel(~MSR_MDE, &dev->icmsr); + + rcar_i2c_raw_rw_finish(dev); + + return 0; +} + +static u8 +rcar_i2c_raw_read(struct rcar_i2c *dev, u8 chip, uint addr) +{ + u8 ret; + + rcar_i2c_raw_rw_common(dev, chip, addr); + + /* set slave address, receive */ + writel((chip << 1) | 1, &dev->icmar); + /* start master receive */ + writel(MCR_MDBS | MCR_MIE | MCR_ESG, &dev->icmcr); + + while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDE)) + != (MSR_MAT | MSR_MDE)) + udelay(10); + + /* clear ESG */ + writel(MCR_MDBS | MCR_MIE, &dev->icmcr); + /* prepare stop condition */ + writel(MCR_MDBS | MCR_MIE | MCR_FSB, &dev->icmcr); + /* start SCLclk */ + writel(~(MSR_MAT | MSR_MDR), &dev->icmsr); + + while (!(readl(&dev->icmsr) & MSR_MDR)) + udelay(10); + + /* get receive data */ + ret = (u8)readl(&dev->icrxdtxd); + /* start SCLclk */ + writel(~MSR_MDR, &dev->icmsr); + + rcar_i2c_raw_rw_finish(dev); + + return ret; +} + +/* + * SCL = iicck / (20 + SCGD * 8 + F[(ticf + tr + intd) * iicck]) + * iicck : I2C internal clock < 20 MHz + * ticf : I2C SCL falling time: 35 ns + * tr : I2C SCL rising time: 200 ns + * intd : LSI internal delay: I2C0: 50 ns I2C1-3: 5 + * F[n] : n rounded up to an integer + */ +static u32 rcar_clock_gen(int i2c_no, u32 bus_speed) +{ + u32 iicck, f, scl, scgd; + u32 intd = 5; + + int bit = 0, cdf_width = 3; + for (bit = 0; bit < (1 << cdf_width); bit++) { + iicck = CONFIG_HP_CLK_FREQ / (1 + bit); + if (iicck < 20000000) + break; + } + + if (bit > (1 << cdf_width)) { + puts("rcar-i2c: Can not get CDF\n"); + return 0; + } + + if (i2c_no == 0) + intd = 50; + + f = (35 + 200 + intd) * (iicck / 1000000000); + + for (scgd = 0; scgd < 0x40; scgd++) { + scl = iicck / (20 + (scgd * 8) + f); + if (scl <= bus_speed) + break; + } + + if (scgd > 0x40) { + puts("rcar-i2c: Can not get SDGB\n"); + return 0; + } + + debug("%s: scl: %d\n", __func__, scl); + debug("%s: bit %x\n", __func__, bit); + debug("%s: scgd %x\n", __func__, scgd); + debug("%s: iccr %x\n", __func__, (scgd << (cdf_width) | bit)); + + return scgd << (cdf_width) | bit; +} + +static void +rcar_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd) +{ + struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr]; + u32 icccr = 0; + + /* No i2c support prior to relocation */ + if (!(gd->flags & GD_FLG_RELOC)) + return; + + /* + * reset slave mode. + * slave mode is not used on this driver + */ + writel(0, &dev->icsier); + writel(0, &dev->icsar); + writel(0, &dev->icscr); + writel(0, &dev->icssr); + + /* reset master mode */ + writel(0, &dev->icmier); + writel(0, &dev->icmcr); + writel(0, &dev->icmsr); + writel(0, &dev->icmar); + + icccr = rcar_clock_gen(adap->hwadapnr, adap->speed); + if (icccr == 0) + puts("I2C: Init failed\n"); + else + writel(icccr, &dev->icccr); +} + +static int rcar_i2c_read(struct i2c_adapter *adap, uint8_t chip, + uint addr, int alen, u8 *data, int len) +{ + struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr]; + int i; + + for (i = 0; i < len; i++) + data[i] = rcar_i2c_raw_read(dev, chip, addr + i); + + return 0; +} + +static int rcar_i2c_write(struct i2c_adapter *adap, uint8_t chip, uint addr, + int alen, u8 *data, int len) +{ + struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr]; + return rcar_i2c_raw_write(dev, chip, addr, data, len); +} + +static int +rcar_i2c_probe(struct i2c_adapter *adap, u8 dev) +{ + return rcar_i2c_read(adap, dev, 0, 0, NULL, 0); +} + +static unsigned int rcar_i2c_set_bus_speed(struct i2c_adapter *adap, + unsigned int speed) +{ + struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr]; + u32 icccr; + int ret = 0; + + rcar_i2c_raw_rw_finish(dev); + + icccr = rcar_clock_gen(adap->hwadapnr, speed); + if (icccr == 0) { + puts("I2C: Init failed\n"); + ret = -1; + } else { + writel(icccr, &dev->icccr); + } + return ret; +} + +/* + * Register RCAR i2c adapters + */ +U_BOOT_I2C_ADAP_COMPLETE(rcar_0, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read, + rcar_i2c_write, rcar_i2c_set_bus_speed, + CONFIG_SYS_RCAR_I2C0_SPEED, 0, 0) +U_BOOT_I2C_ADAP_COMPLETE(rcar_1, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read, + rcar_i2c_write, rcar_i2c_set_bus_speed, + CONFIG_SYS_RCAR_I2C1_SPEED, 0, 1) +U_BOOT_I2C_ADAP_COMPLETE(rcar_2, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read, + rcar_i2c_write, rcar_i2c_set_bus_speed, + CONFIG_SYS_RCAR_I2C2_SPEED, 0, 2) +U_BOOT_I2C_ADAP_COMPLETE(rcar_3, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read, + rcar_i2c_write, rcar_i2c_set_bus_speed, + CONFIG_SYS_RCAR_I2C3_SPEED, 0, 3) diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c index cd09c788b..f77a9d1a1 100644 --- a/drivers/i2c/s3c24x0_i2c.c +++ b/drivers/i2c/s3c24x0_i2c.c @@ -34,6 +34,76 @@ #define I2C_NOK_LA 3 /* Lost arbitration */ #define I2C_NOK_TOUT 4 /* time out */ +/* HSI2C specific register description */ + +/* I2C_CTL Register bits */ +#define HSI2C_FUNC_MODE_I2C (1u << 0) +#define HSI2C_MASTER (1u << 3) +#define HSI2C_RXCHON (1u << 6) /* Write/Send */ +#define HSI2C_TXCHON (1u << 7) /* Read/Receive */ +#define HSI2C_SW_RST (1u << 31) + +/* I2C_FIFO_CTL Register bits */ +#define HSI2C_RXFIFO_EN (1u << 0) +#define HSI2C_TXFIFO_EN (1u << 1) +#define HSI2C_TXFIFO_TRIGGER_LEVEL (0x20 << 16) +#define HSI2C_RXFIFO_TRIGGER_LEVEL (0x20 << 4) + +/* I2C_TRAILING_CTL Register bits */ +#define HSI2C_TRAILING_COUNT (0xff) + +/* I2C_INT_EN Register bits */ +#define HSI2C_TX_UNDERRUN_EN (1u << 2) +#define HSI2C_TX_OVERRUN_EN (1u << 3) +#define HSI2C_RX_UNDERRUN_EN (1u << 4) +#define HSI2C_RX_OVERRUN_EN (1u << 5) +#define HSI2C_INT_TRAILING_EN (1u << 6) +#define HSI2C_INT_I2C_EN (1u << 9) + +#define HSI2C_INT_ERROR_MASK (HSI2C_TX_UNDERRUN_EN |\ + HSI2C_TX_OVERRUN_EN |\ + HSI2C_RX_UNDERRUN_EN |\ + HSI2C_RX_OVERRUN_EN |\ + HSI2C_INT_TRAILING_EN) + +/* I2C_CONF Register bits */ +#define HSI2C_AUTO_MODE (1u << 31) +#define HSI2C_10BIT_ADDR_MODE (1u << 30) +#define HSI2C_HS_MODE (1u << 29) + +/* I2C_AUTO_CONF Register bits */ +#define HSI2C_READ_WRITE (1u << 16) +#define HSI2C_STOP_AFTER_TRANS (1u << 17) +#define HSI2C_MASTER_RUN (1u << 31) + +/* I2C_TIMEOUT Register bits */ +#define HSI2C_TIMEOUT_EN (1u << 31) + +/* I2C_TRANS_STATUS register bits */ +#define HSI2C_MASTER_BUSY (1u << 17) +#define HSI2C_SLAVE_BUSY (1u << 16) +#define HSI2C_TIMEOUT_AUTO (1u << 4) +#define HSI2C_NO_DEV (1u << 3) +#define HSI2C_NO_DEV_ACK (1u << 2) +#define HSI2C_TRANS_ABORT (1u << 1) +#define HSI2C_TRANS_SUCCESS (1u << 0) +#define HSI2C_TRANS_ERROR_MASK (HSI2C_TIMEOUT_AUTO |\ + HSI2C_NO_DEV | HSI2C_NO_DEV_ACK |\ + HSI2C_TRANS_ABORT) +#define HSI2C_TRANS_FINISHED_MASK (HSI2C_TRANS_ERROR_MASK | HSI2C_TRANS_SUCCESS) + + +/* I2C_FIFO_STAT Register bits */ +#define HSI2C_RX_FIFO_EMPTY (1u << 24) +#define HSI2C_RX_FIFO_FULL (1u << 23) +#define HSI2C_TX_FIFO_EMPTY (1u << 8) +#define HSI2C_TX_FIFO_FULL (1u << 7) +#define HSI2C_RX_FIFO_LEVEL(x) (((x) >> 16) & 0x7f) +#define HSI2C_TX_FIFO_LEVEL(x) ((x) & 0x7f) + +#define HSI2C_SLV_ADDR_MAS(x) ((x & 0x3ff) << 10) + +/* S3C I2C Controller bits */ #define I2CSTAT_BSY 0x20 /* Busy bit */ #define I2CSTAT_NACK 0x01 /* Nack bit */ #define I2CCON_ACKGEN 0x80 /* Acknowledge generation */ @@ -43,19 +113,43 @@ #define I2C_START_STOP 0x20 /* START / STOP */ #define I2C_TXRX_ENA 0x10 /* I2C Tx/Rx enable */ -#define I2C_TIMEOUT 1 /* 1 second */ +#define I2C_TIMEOUT_MS 1000 /* 1 second */ + +#define HSI2C_TIMEOUT_US 100000 /* 100 ms, finer granularity */ +/* To support VCMA9 boards and other who dont define max_i2c_num */ +#ifndef CONFIG_MAX_I2C_NUM +#define CONFIG_MAX_I2C_NUM 1 +#endif + /* * For SPL boot some boards need i2c before SDRAM is initialised so force * variables to live in SRAM */ static unsigned int g_current_bus __attribute__((section(".data"))); -#ifdef CONFIG_OF_CONTROL -static int i2c_busses __attribute__((section(".data"))); static struct s3c24x0_i2c_bus i2c_bus[CONFIG_MAX_I2C_NUM] __attribute__((section(".data"))); -#endif + +/** + * Get a pointer to the given bus index + * + * @bus_idx: Bus index to look up + * @return pointer to bus, or NULL if invalid or not available + */ +static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx) +{ + if (bus_idx < ARRAY_SIZE(i2c_bus)) { + struct s3c24x0_i2c_bus *bus; + + bus = &i2c_bus[bus_idx]; + if (bus->active) + return bus; + } + + debug("Undefined bus: %d\n", bus_idx); + return NULL; +} #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) static int GetI2CSDA(void) @@ -84,22 +178,75 @@ static void SetI2CSCL(int x) } #endif +/* + * Wait til the byte transfer is completed. + * + * @param i2c- pointer to the appropriate i2c register bank. + * @return I2C_OK, if transmission was ACKED + * I2C_NACK, if transmission was NACKED + * I2C_NOK_TIMEOUT, if transaction did not complete in I2C_TIMEOUT_MS + */ + static int WaitForXfer(struct s3c24x0_i2c *i2c) { - int i; + ulong start_time = get_timer(0); - i = I2C_TIMEOUT * 10000; - while (!(readl(&i2c->iiccon) & I2CCON_IRPND) && (i > 0)) { - udelay(100); - i--; - } + do { + if (readl(&i2c->iiccon) & I2CCON_IRPND) + return (readl(&i2c->iicstat) & I2CSTAT_NACK) ? + I2C_NACK : I2C_OK; + } while (get_timer(start_time) < I2C_TIMEOUT_MS); - return (readl(&i2c->iiccon) & I2CCON_IRPND) ? I2C_OK : I2C_NOK_TOUT; + return I2C_NOK_TOUT; } -static int IsACK(struct s3c24x0_i2c *i2c) +/* + * Wait for transfer completion. + * + * This function reads the interrupt status register waiting for the INT_I2C + * bit to be set, which indicates copletion of a transaction. + * + * @param i2c: pointer to the appropriate register bank + * + * @return: I2C_OK in case of successful completion, I2C_NOK_TIMEOUT in case + * the status bits do not get set in time, or an approrpiate error + * value in case of transfer errors. + */ +static int hsi2c_wait_for_trx(struct exynos5_hsi2c *i2c) { - return !(readl(&i2c->iicstat) & I2CSTAT_NACK); + int i = HSI2C_TIMEOUT_US; + + while (i-- > 0) { + u32 int_status = readl(&i2c->usi_int_stat); + + if (int_status & HSI2C_INT_I2C_EN) { + u32 trans_status = readl(&i2c->usi_trans_status); + + /* Deassert pending interrupt. */ + writel(int_status, &i2c->usi_int_stat); + + if (trans_status & HSI2C_NO_DEV_ACK) { + debug("%s: no ACK from device\n", __func__); + return I2C_NACK; + } + if (trans_status & HSI2C_NO_DEV) { + debug("%s: no device\n", __func__); + return I2C_NOK; + } + if (trans_status & HSI2C_TRANS_ABORT) { + debug("%s: arbitration lost\n", __func__); + return I2C_NOK_LA; + } + if (trans_status & HSI2C_TIMEOUT_AUTO) { + debug("%s: device timed out\n", __func__); + return I2C_NOK_TOUT; + } + return I2C_OK; + } + udelay(1); + } + debug("%s: transaction timeout!\n", __func__); + return I2C_NOK_TOUT; } static void ReadWriteByte(struct s3c24x0_i2c *i2c) @@ -151,6 +298,109 @@ static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd) writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat); } +#ifdef CONFIG_I2C_MULTI_BUS +static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus) +{ + struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; + ulong clkin; + unsigned int op_clk = i2c_bus->clock_frequency; + unsigned int i = 0, utemp0 = 0, utemp1 = 0; + unsigned int t_ftl_cycle; + +#if defined CONFIG_EXYNOS5 + clkin = get_i2c_clk(); +#endif + /* FPCLK / FI2C = + * (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + 8 + 2 * FLT_CYCLE + * uTemp0 = (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + * uTemp1 = (TSCLK_L + TSCLK_H + 2) + * uTemp2 = TSCLK_L + TSCLK_H + */ + t_ftl_cycle = (readl(&hsregs->usi_conf) >> 16) & 0x7; + utemp0 = (clkin / op_clk) - 8 - 2 * t_ftl_cycle; + + /* CLK_DIV max is 256 */ + for (i = 0; i < 256; i++) { + utemp1 = utemp0 / (i + 1); + if ((utemp1 < 512) && (utemp1 > 4)) { + i2c_bus->clk_cycle = utemp1 - 2; + i2c_bus->clk_div = i; + return 0; + } + } + return -1; +} +#endif + +static void hsi2c_ch_init(struct s3c24x0_i2c_bus *i2c_bus) +{ + struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; + unsigned int t_sr_release; + unsigned int n_clkdiv; + unsigned int t_start_su, t_start_hd; + unsigned int t_stop_su; + unsigned int t_data_su, t_data_hd; + unsigned int t_scl_l, t_scl_h; + u32 i2c_timing_s1; + u32 i2c_timing_s2; + u32 i2c_timing_s3; + u32 i2c_timing_sla; + + n_clkdiv = i2c_bus->clk_div; + t_scl_l = i2c_bus->clk_cycle / 2; + t_scl_h = i2c_bus->clk_cycle / 2; + t_start_su = t_scl_l; + t_start_hd = t_scl_l; + t_stop_su = t_scl_l; + t_data_su = t_scl_l / 2; + t_data_hd = t_scl_l / 2; + t_sr_release = i2c_bus->clk_cycle; + + i2c_timing_s1 = t_start_su << 24 | t_start_hd << 16 | t_stop_su << 8; + i2c_timing_s2 = t_data_su << 24 | t_scl_l << 8 | t_scl_h << 0; + i2c_timing_s3 = n_clkdiv << 16 | t_sr_release << 0; + i2c_timing_sla = t_data_hd << 0; + + writel(HSI2C_TRAILING_COUNT, &hsregs->usi_trailing_ctl); + + /* Clear to enable Timeout */ + clrsetbits_le32(&hsregs->usi_timeout, HSI2C_TIMEOUT_EN, 0); + + /* set AUTO mode */ + writel(readl(&hsregs->usi_conf) | HSI2C_AUTO_MODE, &hsregs->usi_conf); + + /* Enable completion conditions' reporting. */ + writel(HSI2C_INT_I2C_EN, &hsregs->usi_int_en); + + /* Enable FIFOs */ + writel(HSI2C_RXFIFO_EN | HSI2C_TXFIFO_EN, &hsregs->usi_fifo_ctl); + + /* Currently operating in Fast speed mode. */ + writel(i2c_timing_s1, &hsregs->usi_timing_fs1); + writel(i2c_timing_s2, &hsregs->usi_timing_fs2); + writel(i2c_timing_s3, &hsregs->usi_timing_fs3); + writel(i2c_timing_sla, &hsregs->usi_timing_sla); +} + +/* SW reset for the high speed bus */ +static void exynos5_i2c_reset(struct s3c24x0_i2c_bus *i2c_bus) +{ + struct exynos5_hsi2c *i2c = i2c_bus->hsregs; + u32 i2c_ctl; + + /* Set and clear the bit for reset */ + i2c_ctl = readl(&i2c->usi_ctl); + i2c_ctl |= HSI2C_SW_RST; + writel(i2c_ctl, &i2c->usi_ctl); + + i2c_ctl = readl(&i2c->usi_ctl); + i2c_ctl &= ~HSI2C_SW_RST; + writel(i2c_ctl, &i2c->usi_ctl); + + /* Initialize the configure registers */ + hsi2c_ch_init(i2c_bus); +} + /* * MULTI BUS I2C support */ @@ -158,16 +408,21 @@ static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd) #ifdef CONFIG_I2C_MULTI_BUS int i2c_set_bus_num(unsigned int bus) { - struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *i2c_bus; - if ((bus < 0) || (bus >= CONFIG_MAX_I2C_NUM)) { - debug("Bad bus: %d\n", bus); + i2c_bus = get_bus(bus); + if (!i2c_bus) return -1; - } - g_current_bus = bus; - i2c = get_base_i2c(); - i2c_ch_init(i2c, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + + if (i2c_bus->is_highspeed) { + if (hsi2c_get_clk_details(i2c_bus)) + return -1; + hsi2c_ch_init(i2c_bus); + } else { + i2c_ch_init(i2c_bus->regs, i2c_bus->clock_frequency, + CONFIG_SYS_I2C_SLAVE); + } return 0; } @@ -184,20 +439,27 @@ void i2c_init(int speed, int slaveadd) #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio(); #endif - int i; + ulong start_time = get_timer(0); /* By default i2c channel 0 is the current bus */ g_current_bus = 0; i2c = get_base_i2c(); - /* wait for some time to give previous transfer a chance to finish */ - i = I2C_TIMEOUT * 1000; - while ((readl(&i2c->iicstat) & I2CSTAT_BSY) && (i > 0)) { - udelay(1000); - i--; + /* + * In case the previous transfer is still going, wait to give it a + * chance to finish. + */ + while (readl(&i2c->iicstat) & I2CSTAT_BSY) { + if (get_timer(start_time) > I2C_TIMEOUT_MS) { + printf("%s: I2C bus busy for %p\n", __func__, + &i2c->iicstat); + return; + } } #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) + int i; + if ((readl(&i2c->iicstat) & I2CSTAT_BSY) || GetI2CSDA() == 0) { #ifdef CONFIG_S3C2410 ulong old_gpecon = readl(&gpio->gpecon); @@ -246,6 +508,227 @@ void i2c_init(int speed, int slaveadd) } /* + * Poll the appropriate bit of the fifo status register until the interface is + * ready to process the next byte or timeout expires. + * + * In addition to the FIFO status register this function also polls the + * interrupt status register to be able to detect unexpected transaction + * completion. + * + * When FIFO is ready to process the next byte, this function returns I2C_OK. + * If in course of polling the INT_I2C assertion is detected, the function + * returns I2C_NOK. If timeout happens before any of the above conditions is + * met - the function returns I2C_NOK_TOUT; + + * @param i2c: pointer to the appropriate i2c register bank. + * @param rx_transfer: set to True if the receive transaction is in progress. + * @return: as described above. + */ +static unsigned hsi2c_poll_fifo(struct exynos5_hsi2c *i2c, bool rx_transfer) +{ + u32 fifo_bit = rx_transfer ? HSI2C_RX_FIFO_EMPTY : HSI2C_TX_FIFO_FULL; + int i = HSI2C_TIMEOUT_US; + + while (readl(&i2c->usi_fifo_stat) & fifo_bit) { + if (readl(&i2c->usi_int_stat) & HSI2C_INT_I2C_EN) { + /* + * There is a chance that assertion of + * HSI2C_INT_I2C_EN and deassertion of + * HSI2C_RX_FIFO_EMPTY happen simultaneously. Let's + * give FIFO status priority and check it one more + * time before reporting interrupt. The interrupt will + * be reported next time this function is called. + */ + if (rx_transfer && + !(readl(&i2c->usi_fifo_stat) & fifo_bit)) + break; + return I2C_NOK; + } + if (!i--) { + debug("%s: FIFO polling timeout!\n", __func__); + return I2C_NOK_TOUT; + } + udelay(1); + } + return I2C_OK; +} + +/* + * Preapre hsi2c transaction, either read or write. + * + * Set up transfer as described in section 27.5.1.2 'I2C Channel Auto Mode' of + * the 5420 UM. + * + * @param i2c: pointer to the appropriate i2c register bank. + * @param chip: slave address on the i2c bus (with read/write bit exlcuded) + * @param len: number of bytes expected to be sent or received + * @param rx_transfer: set to true for receive transactions + * @param: issue_stop: set to true if i2c stop condition should be generated + * after this transaction. + * @return: I2C_NOK_TOUT in case the bus remained busy for HSI2C_TIMEOUT_US, + * I2C_OK otherwise. + */ +static int hsi2c_prepare_transaction(struct exynos5_hsi2c *i2c, + u8 chip, + u16 len, + bool rx_transfer, + bool issue_stop) +{ + u32 conf; + + conf = len | HSI2C_MASTER_RUN; + + if (issue_stop) + conf |= HSI2C_STOP_AFTER_TRANS; + + /* Clear to enable Timeout */ + writel(readl(&i2c->usi_timeout) & ~HSI2C_TIMEOUT_EN, &i2c->usi_timeout); + + /* Set slave address */ + writel(HSI2C_SLV_ADDR_MAS(chip), &i2c->i2c_addr); + + if (rx_transfer) { + /* i2c master, read transaction */ + writel((HSI2C_RXCHON | HSI2C_FUNC_MODE_I2C | HSI2C_MASTER), + &i2c->usi_ctl); + + /* read up to len bytes, stop after transaction is finished */ + writel(conf | HSI2C_READ_WRITE, &i2c->usi_auto_conf); + } else { + /* i2c master, write transaction */ + writel((HSI2C_TXCHON | HSI2C_FUNC_MODE_I2C | HSI2C_MASTER), + &i2c->usi_ctl); + + /* write up to len bytes, stop after transaction is finished */ + writel(conf, &i2c->usi_auto_conf); + } + + /* Reset all pending interrupt status bits we care about, if any */ + writel(HSI2C_INT_I2C_EN, &i2c->usi_int_stat); + + return I2C_OK; +} + +/* + * Wait while i2c bus is settling down (mostly stop gets completed). + */ +static int hsi2c_wait_while_busy(struct exynos5_hsi2c *i2c) +{ + int i = HSI2C_TIMEOUT_US; + + while (readl(&i2c->usi_trans_status) & HSI2C_MASTER_BUSY) { + if (!i--) { + debug("%s: bus busy\n", __func__); + return I2C_NOK_TOUT; + } + udelay(1); + } + return I2C_OK; +} + +static int hsi2c_write(struct exynos5_hsi2c *i2c, + unsigned char chip, + unsigned char addr[], + unsigned char alen, + unsigned char data[], + unsigned short len, + bool issue_stop) +{ + int i, rv = 0; + + if (!(len + alen)) { + /* Writes of zero length not supported in auto mode. */ + debug("%s: zero length writes not supported\n", __func__); + return I2C_NOK; + } + + rv = hsi2c_prepare_transaction + (i2c, chip, len + alen, false, issue_stop); + if (rv != I2C_OK) + return rv; + + /* Move address, if any, and the data, if any, into the FIFO. */ + for (i = 0; i < alen; i++) { + rv = hsi2c_poll_fifo(i2c, false); + if (rv != I2C_OK) { + debug("%s: address write failed\n", __func__); + goto write_error; + } + writel(addr[i], &i2c->usi_txdata); + } + + for (i = 0; i < len; i++) { + rv = hsi2c_poll_fifo(i2c, false); + if (rv != I2C_OK) { + debug("%s: data write failed\n", __func__); + goto write_error; + } + writel(data[i], &i2c->usi_txdata); + } + + rv = hsi2c_wait_for_trx(i2c); + + write_error: + if (issue_stop) { + int tmp_ret = hsi2c_wait_while_busy(i2c); + if (rv == I2C_OK) + rv = tmp_ret; + } + + writel(HSI2C_FUNC_MODE_I2C, &i2c->usi_ctl); /* done */ + return rv; +} + +static int hsi2c_read(struct exynos5_hsi2c *i2c, + unsigned char chip, + unsigned char addr[], + unsigned char alen, + unsigned char data[], + unsigned short len) +{ + int i, rv, tmp_ret; + bool drop_data = false; + + if (!len) { + /* Reads of zero length not supported in auto mode. */ + debug("%s: zero length read adjusted\n", __func__); + drop_data = true; + len = 1; + } + + if (alen) { + /* Internal register adress needs to be written first. */ + rv = hsi2c_write(i2c, chip, addr, alen, NULL, 0, false); + if (rv != I2C_OK) + return rv; + } + + rv = hsi2c_prepare_transaction(i2c, chip, len, true, true); + + if (rv != I2C_OK) + return rv; + + for (i = 0; i < len; i++) { + rv = hsi2c_poll_fifo(i2c, true); + if (rv != I2C_OK) + goto read_err; + if (drop_data) + continue; + data[i] = readl(&i2c->usi_rxdata); + } + + rv = hsi2c_wait_for_trx(i2c); + + read_err: + tmp_ret = hsi2c_wait_while_busy(i2c); + if (rv == I2C_OK) + rv = tmp_ret; + + writel(HSI2C_FUNC_MODE_I2C, &i2c->usi_ctl); /* done */ + return rv; +} + +/* * cmd_type is 0 for write, 1 for read. * * addr_len can take any value from 0-255, it is only limited @@ -260,7 +743,8 @@ static int i2c_transfer(struct s3c24x0_i2c *i2c, unsigned char data[], unsigned short data_len) { - int i, result; + int i = 0, result; + ulong start_time = get_timer(0); if (data == 0 || data_len == 0) { /*Don't support data transfer of no length or to address 0 */ @@ -268,128 +752,78 @@ static int i2c_transfer(struct s3c24x0_i2c *i2c, return I2C_NOK; } - /* Check I2C bus idle */ - i = I2C_TIMEOUT * 1000; - while ((readl(&i2c->iicstat) & I2CSTAT_BSY) && (i > 0)) { - udelay(1000); - i--; + while (readl(&i2c->iicstat) & I2CSTAT_BSY) { + if (get_timer(start_time) > I2C_TIMEOUT_MS) + return I2C_NOK_TOUT; } - if (readl(&i2c->iicstat) & I2CSTAT_BSY) - return I2C_NOK_TOUT; - writel(readl(&i2c->iiccon) | I2CCON_ACKGEN, &i2c->iiccon); - result = I2C_OK; - switch (cmd_type) { - case I2C_WRITE: - if (addr && addr_len) { - writel(chip, &i2c->iicds); - /* send START */ - writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, - &i2c->iicstat); - i = 0; - while ((i < addr_len) && (result == I2C_OK)) { - result = WaitForXfer(i2c); - writel(addr[i], &i2c->iicds); - ReadWriteByte(i2c); - i++; - } - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - result = WaitForXfer(i2c); - writel(data[i], &i2c->iicds); - ReadWriteByte(i2c); - i++; - } - } else { - writel(chip, &i2c->iicds); - /* send START */ - writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, - &i2c->iicstat); - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - result = WaitForXfer(i2c); - writel(data[i], &i2c->iicds); - ReadWriteByte(i2c); - i++; - } - } + /* Get the slave chip address going */ + writel(chip, &i2c->iicds); + if ((cmd_type == I2C_WRITE) || (addr && addr_len)) + writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->iicstat); + else + writel(I2C_MODE_MR | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->iicstat); + + /* Wait for chip address to transmit. */ + result = WaitForXfer(i2c); + if (result != I2C_OK) + goto bailout; - if (result == I2C_OK) + /* If register address needs to be transmitted - do it now. */ + if (addr && addr_len) { + while ((i < addr_len) && (result == I2C_OK)) { + writel(addr[i++], &i2c->iicds); + ReadWriteByte(i2c); result = WaitForXfer(i2c); + } + i = 0; + if (result != I2C_OK) + goto bailout; + } - /* send STOP */ - writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat); - ReadWriteByte(i2c); + switch (cmd_type) { + case I2C_WRITE: + while ((i < data_len) && (result == I2C_OK)) { + writel(data[i++], &i2c->iicds); + ReadWriteByte(i2c); + result = WaitForXfer(i2c); + } break; case I2C_READ: if (addr && addr_len) { + /* + * Register address has been sent, now send slave chip + * address again to start the actual read transaction. + */ writel(chip, &i2c->iicds); - /* send START */ - writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, - &i2c->iicstat); - result = WaitForXfer(i2c); - if (IsACK(i2c)) { - i = 0; - while ((i < addr_len) && (result == I2C_OK)) { - writel(addr[i], &i2c->iicds); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - i++; - } - - writel(chip, &i2c->iicds); - /* resend START */ - writel(I2C_MODE_MR | I2C_TXRX_ENA | - I2C_START_STOP, &i2c->iicstat); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - /* disable ACK for final READ */ - if (i == data_len - 1) - writel(readl(&i2c->iiccon) - & ~I2CCON_ACKGEN, - &i2c->iiccon); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - data[i] = readl(&i2c->iicds); - i++; - } - } else { - result = I2C_NACK; - } - } else { - writel(chip, &i2c->iicds); - /* send START */ + /* Generate a re-START. */ writel(I2C_MODE_MR | I2C_TXRX_ENA | I2C_START_STOP, &i2c->iicstat); + ReadWriteByte(i2c); result = WaitForXfer(i2c); - if (IsACK(i2c)) { - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - /* disable ACK for final READ */ - if (i == data_len - 1) - writel(readl(&i2c->iiccon) & - ~I2CCON_ACKGEN, - &i2c->iiccon); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - data[i] = readl(&i2c->iicds); - i++; - } - } else { - result = I2C_NACK; - } + if (result != I2C_OK) + goto bailout; } - /* send STOP */ - writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat); - ReadWriteByte(i2c); + while ((i < data_len) && (result == I2C_OK)) { + /* disable ACK for final READ */ + if (i == data_len - 1) + writel(readl(&i2c->iiccon) + & ~I2CCON_ACKGEN, + &i2c->iiccon); + ReadWriteByte(i2c); + result = WaitForXfer(i2c); + data[i++] = readl(&i2c->iicds); + } + if (result == I2C_NACK) + result = I2C_OK; /* Normal terminated read. */ break; default: @@ -398,15 +832,23 @@ static int i2c_transfer(struct s3c24x0_i2c *i2c, break; } +bailout: + /* Send STOP. */ + writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat); + ReadWriteByte(i2c); + return result; } int i2c_probe(uchar chip) { - struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *i2c_bus; uchar buf[1]; + int ret; - i2c = get_base_i2c(); + i2c_bus = get_bus(g_current_bus); + if (!i2c_bus) + return -1; buf[0] = 0; /* @@ -414,12 +856,21 @@ int i2c_probe(uchar chip) * address was <ACK>ed (i.e. there was a chip at that address which * drove the data line low). */ - return i2c_transfer(i2c, I2C_READ, chip << 1, 0, 0, buf, 1) != I2C_OK; + if (i2c_bus->is_highspeed) { + ret = hsi2c_read(i2c_bus->hsregs, + chip, 0, 0, buf, 1); + } else { + ret = i2c_transfer(i2c_bus->regs, + I2C_READ, chip << 1, 0, 0, buf, 1); + } + + + return ret != I2C_OK; } int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) { - struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *i2c_bus; uchar xaddr[4]; int ret; @@ -451,11 +902,21 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); #endif - i2c = get_base_i2c(); - ret = i2c_transfer(i2c, I2C_READ, chip << 1, &xaddr[4 - alen], alen, - buffer, len); - if (ret != 0) { - debug("I2c read: failed %d\n", ret); + i2c_bus = get_bus(g_current_bus); + if (!i2c_bus) + return -1; + + if (i2c_bus->is_highspeed) + ret = hsi2c_read(i2c_bus->hsregs, chip, &xaddr[4 - alen], + alen, buffer, len); + else + ret = i2c_transfer(i2c_bus->regs, I2C_READ, chip << 1, + &xaddr[4 - alen], alen, buffer, len); + + if (ret) { + if (i2c_bus->is_highspeed) + exynos5_i2c_reset(i2c_bus); + debug("I2c read failed %d\n", ret); return 1; } return 0; @@ -463,8 +924,9 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) { - struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *i2c_bus; uchar xaddr[4]; + int ret; if (alen > 4) { debug("I2C write: addr len %d not supported\n", alen); @@ -493,53 +955,87 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); #endif - i2c = get_base_i2c(); - return (i2c_transfer - (i2c, I2C_WRITE, chip << 1, &xaddr[4 - alen], alen, buffer, - len) != 0); + i2c_bus = get_bus(g_current_bus); + if (!i2c_bus) + return -1; + + if (i2c_bus->is_highspeed) + ret = hsi2c_write(i2c_bus->hsregs, chip, &xaddr[4 - alen], + alen, buffer, len, true); + else + ret = i2c_transfer(i2c_bus->regs, I2C_WRITE, chip << 1, + &xaddr[4 - alen], alen, buffer, len); + + if (ret != 0) { + if (i2c_bus->is_highspeed) + exynos5_i2c_reset(i2c_bus); + return 1; + } else { + return 0; + } } #ifdef CONFIG_OF_CONTROL -void board_i2c_init(const void *blob) +static void process_nodes(const void *blob, int node_list[], int count, + int is_highspeed) { + struct s3c24x0_i2c_bus *bus; int i; - int node_list[CONFIG_MAX_I2C_NUM]; - int count; - - count = fdtdec_find_aliases_for_id(blob, "i2c", - COMPAT_SAMSUNG_S3C2440_I2C, node_list, - CONFIG_MAX_I2C_NUM); for (i = 0; i < count; i++) { - struct s3c24x0_i2c_bus *bus; int node = node_list[i]; if (node <= 0) continue; + bus = &i2c_bus[i]; - bus->regs = (struct s3c24x0_i2c *) - fdtdec_get_addr(blob, node, "reg"); + bus->active = true; + bus->is_highspeed = is_highspeed; + + if (is_highspeed) + bus->hsregs = (struct exynos5_hsi2c *) + fdtdec_get_addr(blob, node, "reg"); + else + bus->regs = (struct s3c24x0_i2c *) + fdtdec_get_addr(blob, node, "reg"); + bus->id = pinmux_decode_periph_id(blob, node); + bus->clock_frequency = fdtdec_get_int(blob, node, + "clock-frequency", + CONFIG_SYS_I2C_SPEED); bus->node = node; - bus->bus_num = i2c_busses++; + bus->bus_num = i; exynos_pinmux_config(bus->id, 0); + + /* Mark position as used */ + node_list[i] = -1; } } -static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx) +void board_i2c_init(const void *blob) { - if (bus_idx < i2c_busses) - return &i2c_bus[bus_idx]; + int node_list[CONFIG_MAX_I2C_NUM]; + int count; + + /* First get the normal i2c ports */ + count = fdtdec_find_aliases_for_id(blob, "i2c", + COMPAT_SAMSUNG_S3C2440_I2C, node_list, + CONFIG_MAX_I2C_NUM); + process_nodes(blob, node_list, count, 0); + + /* Now look for high speed i2c ports */ + count = fdtdec_find_aliases_for_id(blob, "i2c", + COMPAT_SAMSUNG_EXYNOS5_I2C, node_list, + CONFIG_MAX_I2C_NUM); + process_nodes(blob, node_list, count, 1); - debug("Undefined bus: %d\n", bus_idx); - return NULL; } int i2c_get_bus_num_fdt(int node) { int i; - for (i = 0; i < i2c_busses; i++) { + for (i = 0; i < ARRAY_SIZE(i2c_bus); i++) { if (node == i2c_bus[i].node) return i; } @@ -548,9 +1044,10 @@ int i2c_get_bus_num_fdt(int node) return -1; } +#ifdef CONFIG_I2C_MULTI_BUS int i2c_reset_port_fdt(const void *blob, int node) { - struct s3c24x0_i2c_bus *i2c; + struct s3c24x0_i2c_bus *i2c_bus; int bus; bus = i2c_get_bus_num_fdt(node); @@ -559,16 +1056,24 @@ int i2c_reset_port_fdt(const void *blob, int node) return -1; } - i2c = get_bus(bus); - if (!i2c) { + i2c_bus = get_bus(bus); + if (!i2c_bus) { debug("get_bus() failed for node node %d\n", node); return -1; } - i2c_ch_init(i2c->regs, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + if (i2c_bus->is_highspeed) { + if (hsi2c_get_clk_details(i2c_bus)) + return -1; + hsi2c_ch_init(i2c_bus); + } else { + i2c_ch_init(i2c_bus->regs, i2c_bus->clock_frequency, + CONFIG_SYS_I2C_SLAVE); + } return 0; } #endif +#endif #endif /* CONFIG_HARD_I2C */ diff --git a/drivers/i2c/s3c24x0_i2c.h b/drivers/i2c/s3c24x0_i2c.h index b4a337a57..1ae73d277 100644 --- a/drivers/i2c/s3c24x0_i2c.h +++ b/drivers/i2c/s3c24x0_i2c.h @@ -15,10 +15,48 @@ struct s3c24x0_i2c { u32 iiclc; }; +struct exynos5_hsi2c { + u32 usi_ctl; + u32 usi_fifo_ctl; + u32 usi_trailing_ctl; + u32 usi_clk_ctl; + u32 usi_clk_slot; + u32 spi_ctl; + u32 uart_ctl; + u32 res1; + u32 usi_int_en; + u32 usi_int_stat; + u32 usi_modem_stat; + u32 usi_error_stat; + u32 usi_fifo_stat; + u32 usi_txdata; + u32 usi_rxdata; + u32 res2; + u32 usi_conf; + u32 usi_auto_conf; + u32 usi_timeout; + u32 usi_manual_cmd; + u32 usi_trans_status; + u32 usi_timing_hs1; + u32 usi_timing_hs2; + u32 usi_timing_hs3; + u32 usi_timing_fs1; + u32 usi_timing_fs2; + u32 usi_timing_fs3; + u32 usi_timing_sla; + u32 i2c_addr; +}; + struct s3c24x0_i2c_bus { + bool active; /* port is active and available */ int node; /* device tree node */ int bus_num; /* i2c bus number */ struct s3c24x0_i2c *regs; + struct exynos5_hsi2c *hsregs; + int is_highspeed; /* High speed type, rather than I2C */ + unsigned clock_frequency; int id; + unsigned clk_cycle; + unsigned clk_div; }; #endif /* _S3C24X0_I2C_H */ diff --git a/drivers/i2c/sh_i2c.c b/drivers/i2c/sh_i2c.c index 58f8bf1bd..808202c29 100644 --- a/drivers/i2c/sh_i2c.c +++ b/drivers/i2c/sh_i2c.c @@ -1,6 +1,6 @@ /* - * Copyright (C) 2011 Renesas Solutions Corp. - * Copyright (C) 2011 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> + * Copyright (C) 2011, 2013 Renesas Solutions Corp. + * Copyright (C) 2011, 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> * * SPDX-License-Identifier: GPL-2.0+ */ @@ -8,6 +8,8 @@ #include <common.h> #include <asm/io.h> +DECLARE_GLOBAL_DATA_PTR; + /* Every register is 32bit aligned, but only 8bits in size */ #define ureg(name) u8 name; u8 __pad_##name##0; u16 __pad_##name##1; struct sh_i2c { @@ -240,6 +242,10 @@ void i2c_init(int speed, int slaveaddr) { int num, denom, tmp; + /* No i2c support prior to relocation */ + if (!(gd->flags & GD_FLG_RELOC)) + return; + #ifdef CONFIG_I2C_MULTI_BUS current_bus = 0; #endif |