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-rw-r--r--drivers/i2c/Makefile3
-rw-r--r--drivers/i2c/i2c_core.c39
-rw-r--r--drivers/i2c/mxc_i2c.c137
-rw-r--r--drivers/i2c/rcar_i2c.c288
-rw-r--r--drivers/i2c/s3c24x0_i2c.c835
-rw-r--r--drivers/i2c/s3c24x0_i2c.h38
-rw-r--r--drivers/i2c/sh_i2c.c10
7 files changed, 1104 insertions, 246 deletions
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index df3092e..84a2754 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -14,7 +14,6 @@ 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
@@ -28,7 +27,9 @@ 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-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o
COBJS-$(CONFIG_SYS_I2C_PPC4XX) += ppc4xx_i2c.o
+COBJS-$(CONFIG_SYS_I2C_RCAR) += rcar_i2c.o
COBJS-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o
COBJS-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o
COBJS-$(CONFIG_ZYNQ_I2C) += zynq_i2c.o
diff --git a/drivers/i2c/i2c_core.c b/drivers/i2c/i2c_core.c
index d1072e8..e1767f4 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 06ba4e3..595019b 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 0000000..ba2cadb
--- /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 cd09c78..f77a9d1 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 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;
+ }
- if (result == I2C_OK)
+ switch (cmd_type) {
+ case I2C_WRITE:
+ while ((i < data_len) && (result == I2C_OK)) {
+ writel(data[i++], &i2c->iicds);
+ ReadWriteByte(i2c);
result = WaitForXfer(i2c);
-
- /* send STOP */
- writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat);
- ReadWriteByte(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 b4a337a..1ae73d2 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 58f8bf1..808202c 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
generated by cgit v1.1 at 2024-12-26 21:52:08 +0000