X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fi2c%2Fi2c-uniphier.c;h=0f2734eb02e50bf1d52e3590b07211a961896319;hb=f86474e28185a1f31a2c993fa0f34b1a94c8c6e0;hp=f8221da82e4f76da198e9cf018e40f0ee4edb0dd;hpb=814013253fd4cf932d0fb32f7043f09a2a748d9a;p=u-boot diff --git a/drivers/i2c/i2c-uniphier.c b/drivers/i2c/i2c-uniphier.c index f8221da82e..0f2734eb02 100644 --- a/drivers/i2c/i2c-uniphier.c +++ b/drivers/i2c/i2c-uniphier.c @@ -1,19 +1,19 @@ /* - * Copyright (C) 2014-2015 Masahiro Yamada + * Copyright (C) 2014 Panasonic Corporation + * Copyright (C) 2015-2016 Socionext Inc. + * Author: Masahiro Yamada * * SPDX-License-Identifier: GPL-2.0+ */ -#include -#include +#include +#include #include #include -#include -#include -#include -#include +#include +#include #include -#include +#include struct uniphier_i2c_regs { u32 dtrm; /* data transmission */ @@ -38,7 +38,8 @@ struct uniphier_i2c_regs { #define IOBUS_FREQ 100000000 -struct uniphier_i2c_dev { +struct uniphier_i2c_priv { + struct udevice *dev; struct uniphier_i2c_regs __iomem *regs; /* register base */ unsigned long input_clk; /* master clock (Hz) */ unsigned long wait_us; /* wait for every byte transfer (us) */ @@ -47,36 +48,29 @@ struct uniphier_i2c_dev { static int uniphier_i2c_probe(struct udevice *dev) { fdt_addr_t addr; - struct uniphier_i2c_dev *priv = dev_get_priv(dev); + struct uniphier_i2c_priv *priv = dev_get_priv(dev); - addr = dev_get_addr(dev); + addr = devfdt_get_addr(dev); if (addr == FDT_ADDR_T_NONE) return -EINVAL; - priv->regs = map_sysmem(addr, SZ_64); + priv->regs = devm_ioremap(dev, addr, SZ_64); if (!priv->regs) return -ENOMEM; priv->input_clk = IOBUS_FREQ; + priv->dev = dev; + /* deassert reset */ writel(0x3, &priv->regs->brst); return 0; } -static int uniphier_i2c_remove(struct udevice *dev) -{ - struct uniphier_i2c_dev *priv = dev_get_priv(dev); - - unmap_sysmem(priv->regs); - - return 0; -} - -static int send_and_recv_byte(struct uniphier_i2c_dev *dev, u32 dtrm) +static int send_and_recv_byte(struct uniphier_i2c_priv *priv, u32 dtrm) { - writel(dtrm, &dev->regs->dtrm); + writel(dtrm, &priv->regs->dtrm); /* * This controller only provides interruption to inform the completion @@ -84,72 +78,72 @@ static int send_and_recv_byte(struct uniphier_i2c_dev *dev, u32 dtrm) * Unfortunately, U-Boot does not have a good support of interrupt. * Wait for a while. */ - udelay(dev->wait_us); + udelay(priv->wait_us); - return readl(&dev->regs->drec); + return readl(&priv->regs->drec); } -static int send_byte(struct uniphier_i2c_dev *dev, u32 dtrm, bool *stop) +static int send_byte(struct uniphier_i2c_priv *priv, u32 dtrm, bool *stop) { int ret = 0; u32 drec; - drec = send_and_recv_byte(dev, dtrm); + drec = send_and_recv_byte(priv, dtrm); if (drec & I2C_DREC_LAB) { - debug("uniphier_i2c: bus arbitration failed\n"); + dev_dbg(priv->dev, "uniphier_i2c: bus arbitration failed\n"); *stop = false; ret = -EREMOTEIO; } if (drec & I2C_DREC_LRB) { - debug("uniphier_i2c: slave did not return ACK\n"); + dev_dbg(priv->dev, "uniphier_i2c: slave did not return ACK\n"); ret = -EREMOTEIO; } return ret; } -static int uniphier_i2c_transmit(struct uniphier_i2c_dev *dev, uint addr, +static int uniphier_i2c_transmit(struct uniphier_i2c_priv *priv, uint addr, uint len, const u8 *buf, bool *stop) { int ret; - debug("%s: addr = %x, len = %d\n", __func__, addr, len); + dev_dbg(priv->dev, "%s: addr = %x, len = %d\n", __func__, addr, len); - ret = send_byte(dev, I2C_DTRM_STA | I2C_DTRM_NACK | addr << 1, stop); + ret = send_byte(priv, I2C_DTRM_STA | I2C_DTRM_NACK | addr << 1, stop); if (ret < 0) goto fail; while (len--) { - ret = send_byte(dev, I2C_DTRM_NACK | *buf++, stop); + ret = send_byte(priv, I2C_DTRM_NACK | *buf++, stop); if (ret < 0) goto fail; } fail: if (*stop) - writel(I2C_DTRM_STO | I2C_DTRM_NACK, &dev->regs->dtrm); + writel(I2C_DTRM_STO | I2C_DTRM_NACK, &priv->regs->dtrm); return ret; } -static int uniphier_i2c_receive(struct uniphier_i2c_dev *dev, uint addr, +static int uniphier_i2c_receive(struct uniphier_i2c_priv *priv, uint addr, uint len, u8 *buf, bool *stop) { int ret; - debug("%s: addr = %x, len = %d\n", __func__, addr, len); + dev_dbg(priv->dev, "%s: addr = %x, len = %d\n", __func__, addr, len); - ret = send_byte(dev, I2C_DTRM_STA | I2C_DTRM_NACK | + ret = send_byte(priv, I2C_DTRM_STA | I2C_DTRM_NACK | I2C_DTRM_RD | addr << 1, stop); if (ret < 0) goto fail; while (len--) - *buf++ = send_and_recv_byte(dev, len ? 0 : I2C_DTRM_NACK); + *buf++ = send_and_recv_byte(priv, len ? 0 : I2C_DTRM_NACK); fail: if (*stop) - writel(I2C_DTRM_STO | I2C_DTRM_NACK, &dev->regs->dtrm); + writel(I2C_DTRM_STO | I2C_DTRM_NACK, &priv->regs->dtrm); return ret; } @@ -158,7 +152,7 @@ static int uniphier_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) { int ret = 0; - struct uniphier_i2c_dev *dev = dev_get_priv(bus); + struct uniphier_i2c_priv *priv = dev_get_priv(bus); bool stop; for (; nmsgs > 0; nmsgs--, msg++) { @@ -166,10 +160,10 @@ static int uniphier_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, stop = nmsgs > 1 && msg[1].flags & I2C_M_RD ? false : true; if (msg->flags & I2C_M_RD) - ret = uniphier_i2c_receive(dev, msg->addr, msg->len, + ret = uniphier_i2c_receive(priv, msg->addr, msg->len, msg->buf, &stop); else - ret = uniphier_i2c_transmit(dev, msg->addr, msg->len, + ret = uniphier_i2c_transmit(priv, msg->addr, msg->len, msg->buf, &stop); if (ret < 0) @@ -181,7 +175,7 @@ static int uniphier_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, static int uniphier_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) { - struct uniphier_i2c_dev *priv = dev_get_priv(bus); + struct uniphier_i2c_priv *priv = dev_get_priv(bus); /* max supported frequency is 400 kHz */ if (speed > 400000) @@ -220,7 +214,6 @@ U_BOOT_DRIVER(uniphier_i2c) = { .id = UCLASS_I2C, .of_match = uniphier_i2c_of_match, .probe = uniphier_i2c_probe, - .remove = uniphier_i2c_remove, - .priv_auto_alloc_size = sizeof(struct uniphier_i2c_dev), + .priv_auto_alloc_size = sizeof(struct uniphier_i2c_priv), .ops = &uniphier_i2c_ops, };