+// SPDX-License-Identifier: GPL-2.0+
/*
- * Copyright (C) 2014 Panasonic Corporation
- * Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
+ * Copyright (C) 2014 Panasonic Corporation
+ * Copyright (C) 2015-2016 Socionext Inc.
+ * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*/
-#include <common.h>
+#include <dm/device_compat.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/sizes.h>
#include <linux/types.h>
-#include <asm/io.h>
-#include <asm/errno.h>
-#include <dm/device.h>
-#include <dm/root.h>
+#include <dm.h>
#include <i2c.h>
#include <fdtdec.h>
-DECLARE_GLOBAL_DATA_PTR;
-
struct uniphier_fi2c_regs {
u32 cr; /* control register */
#define I2C_CR_MST (1 << 3) /* master mode */
#define FIOCLK 50000000
-struct uniphier_fi2c_dev {
+struct uniphier_fi2c_priv {
+ struct udevice *dev;
struct uniphier_fi2c_regs __iomem *regs; /* register base */
unsigned long fioclk; /* internal operation clock */
unsigned long timeout; /* time out (us) */
};
-static int poll_status(u32 __iomem *reg, u32 flag)
+static void uniphier_fi2c_reset(struct uniphier_fi2c_priv *priv)
{
- int wait = 1000000; /* 1 sec is long enough */
-
- while (readl(reg) & flag) {
- if (wait-- < 0)
- return -EREMOTEIO;
- udelay(1);
- }
-
- return 0;
+ writel(I2C_RST_RST, &priv->regs->rst);
}
-static int reset_bus(struct uniphier_fi2c_regs __iomem *regs)
+static int uniphier_fi2c_check_bus_busy(struct uniphier_fi2c_priv *priv)
{
+ u32 val;
int ret;
- /* bus forcible reset */
- writel(I2C_RST_RST, ®s->rst);
- ret = poll_status(®s->rst, I2C_RST_RST);
- if (ret < 0)
- debug("error: fail to reset I2C controller\n");
-
- return ret;
-}
-
-static int check_device_busy(struct uniphier_fi2c_regs __iomem *regs)
-{
- int ret;
-
- ret = poll_status(®s->sr, I2C_SR_DB);
+ ret = readl_poll_timeout(&priv->regs->sr, val, !(val & I2C_SR_DB), 100);
if (ret < 0) {
- debug("error: device busy too long. reset...\n");
- ret = reset_bus(regs);
+ dev_dbg(priv->dev, "error: device busy too long. reset...\n");
+ uniphier_fi2c_reset(priv);
}
return ret;
static int uniphier_fi2c_probe(struct udevice *dev)
{
fdt_addr_t addr;
- fdt_size_t size;
- struct uniphier_fi2c_dev *priv = dev_get_priv(dev);
- int ret;
+ struct uniphier_fi2c_priv *priv = dev_get_priv(dev);
- addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg",
- &size);
-
- priv->regs = map_sysmem(addr, size);
+ addr = devfdt_get_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+ priv->regs = devm_ioremap(dev, addr, SZ_128);
if (!priv->regs)
return -ENOMEM;
priv->fioclk = FIOCLK;
+ priv->dev = dev;
+
/* bus forcible reset */
- ret = reset_bus(priv->regs);
- if (ret < 0)
- return ret;
+ uniphier_fi2c_reset(priv);
writel(I2C_BRST_FOEN | I2C_BRST_RSCLO, &priv->regs->brst);
return 0;
}
-static int uniphier_fi2c_remove(struct udevice *dev)
-{
- struct uniphier_fi2c_dev *priv = dev_get_priv(dev);
-
- unmap_sysmem(priv->regs);
-
- return 0;
-}
-
-static int wait_for_irq(struct uniphier_fi2c_dev *dev, u32 flags,
+static int wait_for_irq(struct uniphier_fi2c_priv *priv, u32 flags,
bool *stop)
{
u32 irq;
- unsigned long wait = dev->timeout;
- int ret = -EREMOTEIO;
-
- do {
- udelay(1);
- irq = readl(&dev->regs->intr);
- } while (!(irq & flags) && wait--);
+ int ret;
- if (wait < 0) {
- debug("error: time out\n");
+ ret = readl_poll_timeout(&priv->regs->intr, irq, irq & flags,
+ priv->timeout);
+ if (ret < 0) {
+ dev_dbg(priv->dev, "error: time out\n");
return ret;
}
if (irq & I2C_INT_AL) {
- debug("error: arbitration lost\n");
+ dev_dbg(priv->dev, "error: arbitration lost\n");
*stop = false;
return ret;
}
if (irq & I2C_INT_NA) {
- debug("error: no answer\n");
+ dev_dbg(priv->dev, "error: no answer\n");
return ret;
}
return 0;
}
-static int issue_stop(struct uniphier_fi2c_dev *dev, int old_ret)
+static int issue_stop(struct uniphier_fi2c_priv *priv, int old_ret)
{
int ret;
- debug("stop condition\n");
- writel(I2C_CR_MST | I2C_CR_STO, &dev->regs->cr);
+ dev_dbg(priv->dev, "stop condition\n");
+ writel(I2C_CR_MST | I2C_CR_STO, &priv->regs->cr);
- ret = poll_status(&dev->regs->sr, I2C_SR_DB);
+ ret = uniphier_fi2c_check_bus_busy(priv);
if (ret < 0)
- debug("error: device busy after operation\n");
+ dev_dbg(priv->dev, "error: device busy after operation\n");
return old_ret ? old_ret : ret;
}
-static int uniphier_fi2c_transmit(struct uniphier_fi2c_dev *dev, uint addr,
+static int uniphier_fi2c_transmit(struct uniphier_fi2c_priv *priv, uint addr,
uint len, const u8 *buf, bool *stop)
{
int ret;
const u32 irq_flags = I2C_INT_TE | I2C_INT_NA | I2C_INT_AL;
- struct uniphier_fi2c_regs __iomem *regs = dev->regs;
+ struct uniphier_fi2c_regs __iomem *regs = priv->regs;
- debug("%s: addr = %x, len = %d\n", __func__, addr, len);
+ dev_dbg(priv->dev, "%s: addr = %x, len = %d\n", __func__, addr, len);
writel(I2C_DTTX_CMD | addr << 1, ®s->dttx);
writel(irq_flags, ®s->ie);
writel(irq_flags, ®s->ic);
- debug("start condition\n");
+ dev_dbg(priv->dev, "start condition\n");
writel(I2C_CR_MST | I2C_CR_STA, ®s->cr);
- ret = wait_for_irq(dev, irq_flags, stop);
+ ret = wait_for_irq(priv, irq_flags, stop);
if (ret < 0)
goto error;
while (len--) {
- debug("sending %x\n", *buf);
+ dev_dbg(priv->dev, "sending %x\n", *buf);
writel(*buf++, ®s->dttx);
writel(irq_flags, ®s->ic);
- ret = wait_for_irq(dev, irq_flags, stop);
+ ret = wait_for_irq(priv, irq_flags, stop);
if (ret < 0)
goto error;
}
writel(irq_flags, ®s->ic);
if (*stop)
- ret = issue_stop(dev, ret);
+ ret = issue_stop(priv, ret);
return ret;
}
-static int uniphier_fi2c_receive(struct uniphier_fi2c_dev *dev, uint addr,
+static int uniphier_fi2c_receive(struct uniphier_fi2c_priv *priv, uint addr,
uint len, u8 *buf, bool *stop)
{
int ret = 0;
const u32 irq_flags = I2C_INT_RB | I2C_INT_NA | I2C_INT_AL;
- struct uniphier_fi2c_regs __iomem *regs = dev->regs;
+ struct uniphier_fi2c_regs __iomem *regs = priv->regs;
- debug("%s: addr = %x, len = %d\n", __func__, addr, len);
+ dev_dbg(priv->dev, "%s: addr = %x, len = %d\n", __func__, addr, len);
/*
* In case 'len == 0', only the slave address should be sent
* for probing, which is covered by the transmit function.
*/
if (len == 0)
- return uniphier_fi2c_transmit(dev, addr, len, buf, stop);
+ return uniphier_fi2c_transmit(priv, addr, len, buf, stop);
writel(I2C_DTTX_CMD | I2C_DTTX_RD | addr << 1, ®s->dttx);
writel(irq_flags, ®s->ie);
writel(irq_flags, ®s->ic);
- debug("start condition\n");
+ dev_dbg(priv->dev, "start condition\n");
writel(I2C_CR_MST | I2C_CR_STA | (len == 1 ? I2C_CR_NACK : 0),
®s->cr);
while (len--) {
- ret = wait_for_irq(dev, irq_flags, stop);
+ ret = wait_for_irq(priv, irq_flags, stop);
if (ret < 0)
goto error;
*buf++ = readl(®s->dtrx);
- debug("received %x\n", *(buf - 1));
+ dev_dbg(priv->dev, "received %x\n", *(buf - 1));
if (len == 1)
writel(I2C_CR_MST | I2C_CR_NACK, ®s->cr);
writel(irq_flags, ®s->ic);
if (*stop)
- ret = issue_stop(dev, ret);
+ ret = issue_stop(priv, ret);
return ret;
}
int nmsgs)
{
int ret;
- struct uniphier_fi2c_dev *dev = dev_get_priv(bus);
+ struct uniphier_fi2c_priv *priv = dev_get_priv(bus);
bool stop;
- ret = check_device_busy(dev->regs);
+ ret = uniphier_fi2c_check_bus_busy(priv);
if (ret < 0)
return ret;
stop = nmsgs > 1 && msg[1].flags & I2C_M_RD ? false : true;
if (msg->flags & I2C_M_RD)
- ret = uniphier_fi2c_receive(dev, msg->addr, msg->len,
+ ret = uniphier_fi2c_receive(priv, msg->addr, msg->len,
msg->buf, &stop);
else
- ret = uniphier_fi2c_transmit(dev, msg->addr, msg->len,
+ ret = uniphier_fi2c_transmit(priv, msg->addr, msg->len,
msg->buf, &stop);
if (ret < 0)
{
int ret;
unsigned int clk_count;
- struct uniphier_fi2c_dev *dev = dev_get_priv(bus);
- struct uniphier_fi2c_regs __iomem *regs = dev->regs;
+ struct uniphier_fi2c_priv *priv = dev_get_priv(bus);
+ struct uniphier_fi2c_regs __iomem *regs = priv->regs;
/* max supported frequency is 400 kHz */
- if (speed > 400000)
+ if (speed > I2C_SPEED_FAST_RATE)
return -EINVAL;
- ret = check_device_busy(dev->regs);
+ ret = uniphier_fi2c_check_bus_busy(priv);
if (ret < 0)
return ret;
/* make sure the bus is idle when changing the frequency */
writel(I2C_BRST_RSCLO, ®s->brst);
- clk_count = dev->fioclk / speed;
+ clk_count = priv->fioclk / speed;
writel(clk_count, ®s->cyc);
writel(clk_count / 2, ®s->lctl);
* 1000000 * 9 / speed usec.
* This time out value is long enough.
*/
- dev->timeout = 100000000L / speed;
+ priv->timeout = 100000000L / speed;
return 0;
}
};
static const struct udevice_id uniphier_fi2c_of_match[] = {
- { .compatible = "panasonic,uniphier-fi2c" },
- {},
+ { .compatible = "socionext,uniphier-fi2c" },
+ { /* sentinel */ }
};
U_BOOT_DRIVER(uniphier_fi2c) = {
.id = UCLASS_I2C,
.of_match = uniphier_fi2c_of_match,
.probe = uniphier_fi2c_probe,
- .remove = uniphier_fi2c_remove,
- .priv_auto_alloc_size = sizeof(struct uniphier_fi2c_dev),
+ .priv_auto_alloc_size = sizeof(struct uniphier_fi2c_priv),
.ops = &uniphier_fi2c_ops,
};
projects / oweals / u-boot.git / blobdiff