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u-boot/drivers/i2c/sh_i2c.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2011, 2013 Renesas Solutions Corp.
* Copyright (C) 2011, 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
*
* NOTE: This driver should be converted to driver model before June 2017.
* Please see doc/driver-model/i2c-howto.txt for instructions.
*/
#include <common.h>
#include <i2c.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 {
ureg(icdr);
ureg(iccr);
ureg(icsr);
ureg(icic);
ureg(iccl);
ureg(icch);
};
#undef ureg
/* ICCR */
#define SH_I2C_ICCR_ICE (1 << 7)
#define SH_I2C_ICCR_RACK (1 << 6)
#define SH_I2C_ICCR_RTS (1 << 4)
#define SH_I2C_ICCR_BUSY (1 << 2)
#define SH_I2C_ICCR_SCP (1 << 0)
/* ICSR / ICIC */
#define SH_IC_BUSY (1 << 4)
#define SH_IC_TACK (1 << 2)
#define SH_IC_WAIT (1 << 1)
#define SH_IC_DTE (1 << 0)
#ifdef CONFIG_SH_I2C_8BIT
/* store 8th bit of iccl and icch in ICIC register */
#define SH_I2C_ICIC_ICCLB8 (1 << 7)
#define SH_I2C_ICIC_ICCHB8 (1 << 6)
#endif
static const struct sh_i2c *i2c_dev[CONFIG_SYS_I2C_SH_NUM_CONTROLLERS] = {
(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE0,
#ifdef CONFIG_SYS_I2C_SH_BASE1
(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE1,
#endif
#ifdef CONFIG_SYS_I2C_SH_BASE2
(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE2,
#endif
#ifdef CONFIG_SYS_I2C_SH_BASE3
(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE3,
#endif
#ifdef CONFIG_SYS_I2C_SH_BASE4
(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE4,
#endif
};
static u16 iccl, icch;
#define IRQ_WAIT 1000
static void sh_irq_dte(struct sh_i2c *dev)
{
int i;
for (i = 0; i < IRQ_WAIT; i++) {
if (SH_IC_DTE & readb(&dev->icsr))
break;
udelay(10);
}
}
static int sh_irq_dte_with_tack(struct sh_i2c *dev)
{
int i;
for (i = 0; i < IRQ_WAIT; i++) {
if (SH_IC_DTE & readb(&dev->icsr))
break;
if (SH_IC_TACK & readb(&dev->icsr))
return -1;
udelay(10);
}
return 0;
}
static void sh_irq_busy(struct sh_i2c *dev)
{
int i;
for (i = 0; i < IRQ_WAIT; i++) {
if (!(SH_IC_BUSY & readb(&dev->icsr)))
break;
udelay(10);
}
}
static int sh_i2c_set_addr(struct sh_i2c *dev, u8 chip, u8 addr, int stop)
{
u8 icic = SH_IC_TACK;
debug("%s: chip: %x, addr: %x iccl: %x, icch %x\n",
__func__, chip, addr, iccl, icch);
clrbits_8(&dev->iccr, SH_I2C_ICCR_ICE);
setbits_8(&dev->iccr, SH_I2C_ICCR_ICE);
writeb(iccl & 0xff, &dev->iccl);
writeb(icch & 0xff, &dev->icch);
#ifdef CONFIG_SH_I2C_8BIT
if (iccl > 0xff)
icic |= SH_I2C_ICIC_ICCLB8;
if (icch > 0xff)
icic |= SH_I2C_ICIC_ICCHB8;
#endif
writeb(icic, &dev->icic);
writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS|SH_I2C_ICCR_BUSY), &dev->iccr);
sh_irq_dte(dev);
clrbits_8(&dev->icsr, SH_IC_TACK);
writeb(chip << 1, &dev->icdr);
if (sh_irq_dte_with_tack(dev) != 0)
return -1;
writeb(addr, &dev->icdr);
if (stop)
writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS), &dev->iccr);
if (sh_irq_dte_with_tack(dev) != 0)
return -1;
return 0;
}
static void sh_i2c_finish(struct sh_i2c *dev)
{
writeb(0, &dev->icsr);
clrbits_8(&dev->iccr, SH_I2C_ICCR_ICE);
}
static int
sh_i2c_raw_write(struct sh_i2c *dev, u8 chip, uint addr, u8 val)
{
int ret = -1;
if (sh_i2c_set_addr(dev, chip, addr, 0) != 0)
goto exit0;
udelay(10);
writeb(val, &dev->icdr);
if (sh_irq_dte_with_tack(dev) != 0)
goto exit0;
writeb((SH_I2C_ICCR_ICE | SH_I2C_ICCR_RTS), &dev->iccr);
if (sh_irq_dte_with_tack(dev) != 0)
goto exit0;
sh_irq_busy(dev);
ret = 0;
exit0:
sh_i2c_finish(dev);
return ret;
}
static int sh_i2c_raw_read(struct sh_i2c *dev, u8 chip, u8 addr)
{
int ret = -1;
#if defined(CONFIG_SH73A0)
if (sh_i2c_set_addr(dev, chip, addr, 0) != 0)
goto exit0;
#else
if (sh_i2c_set_addr(dev, chip, addr, 1) != 0)
goto exit0;
udelay(100);
#endif
writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS|SH_I2C_ICCR_BUSY), &dev->iccr);
sh_irq_dte(dev);
writeb(chip << 1 | 0x01, &dev->icdr);
if (sh_irq_dte_with_tack(dev) != 0)
goto exit0;
writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_SCP), &dev->iccr);
if (sh_irq_dte_with_tack(dev) != 0)
goto exit0;
ret = readb(&dev->icdr) & 0xff;
writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RACK), &dev->iccr);
readb(&dev->icdr); /* Dummy read */
sh_irq_busy(dev);
exit0:
sh_i2c_finish(dev);
return ret;
}
static void
sh_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
{
int num, denom, tmp;
/* No i2c support prior to relocation */
if (!(gd->flags & GD_FLG_RELOC))
return;
/*
* Calculate the value for iccl. From the data sheet:
* iccl = (p-clock / transfer-rate) * (L / (L + H))
* where L and H are the SCL low and high ratio.
*/
num = CONFIG_SH_I2C_CLOCK * CONFIG_SH_I2C_DATA_LOW;
denom = speed * (CONFIG_SH_I2C_DATA_HIGH + CONFIG_SH_I2C_DATA_LOW);
tmp = num * 10 / denom;
if (tmp % 10 >= 5)
iccl = (u16)((num/denom) + 1);
else
iccl = (u16)(num/denom);
/* Calculate the value for icch. From the data sheet:
icch = (p clock / transfer rate) * (H / (L + H)) */
num = CONFIG_SH_I2C_CLOCK * CONFIG_SH_I2C_DATA_HIGH;
tmp = num * 10 / denom;
if (tmp % 10 >= 5)
icch = (u16)((num/denom) + 1);
else
icch = (u16)(num/denom);
debug("clock: %d, speed %d, iccl: %x, icch: %x\n",
CONFIG_SH_I2C_CLOCK, speed, iccl, icch);
}
static int sh_i2c_read(struct i2c_adapter *adap, uint8_t chip,
uint addr, int alen, u8 *data, int len)
{
int ret, i;
struct sh_i2c *dev = (struct sh_i2c *)i2c_dev[adap->hwadapnr];
for (i = 0; i < len; i++) {
ret = sh_i2c_raw_read(dev, chip, addr + i);
if (ret < 0)
return -1;
data[i] = ret & 0xff;
debug("%s: data[%d]: %02x\n", __func__, i, data[i]);
}
return 0;
}
static int sh_i2c_write(struct i2c_adapter *adap, uint8_t chip, uint addr,
int alen, u8 *data, int len)
{
struct sh_i2c *dev = (struct sh_i2c *)i2c_dev[adap->hwadapnr];
int i;
for (i = 0; i < len; i++) {
debug("%s: data[%d]: %02x\n", __func__, i, data[i]);
if (sh_i2c_raw_write(dev, chip, addr + i, data[i]) != 0)
return -1;
}
return 0;
}
static int
sh_i2c_probe(struct i2c_adapter *adap, u8 dev)
{
u8 dummy[1];
return sh_i2c_read(adap, dev, 0, 0, dummy, sizeof dummy);
}
static unsigned int sh_i2c_set_bus_speed(struct i2c_adapter *adap,
unsigned int speed)
{
struct sh_i2c *dev = (struct sh_i2c *)i2c_dev[adap->hwadapnr];
sh_i2c_finish(dev);
sh_i2c_init(adap, speed, 0);
return 0;
}
/*
* Register RCAR i2c adapters
*/
U_BOOT_I2C_ADAP_COMPLETE(sh_0, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED0, 0, 0)
#ifdef CONFIG_SYS_I2C_SH_BASE1
U_BOOT_I2C_ADAP_COMPLETE(sh_1, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED1, 0, 1)
#endif
#ifdef CONFIG_SYS_I2C_SH_BASE2
U_BOOT_I2C_ADAP_COMPLETE(sh_2, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED2, 0, 2)
#endif
#ifdef CONFIG_SYS_I2C_SH_BASE3
U_BOOT_I2C_ADAP_COMPLETE(sh_3, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED3, 0, 3)
#endif
#ifdef CONFIG_SYS_I2C_SH_BASE4
U_BOOT_I2C_ADAP_COMPLETE(sh_4, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED4, 0, 4)
#endif
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