Merge tag 'i2c-updates-for-v2023.04' of https://source.denx.de/u-boot/custodians/u-boot-i2c

i2c updates for v2023.04

- add new i2c driver ast2600 from Ryan Chen

- i2c-cdns: make read fifo-depth configurable through device tree
  from Pei Yue Ho

- mxc i2c driver: print base address in hex, not in decimal
  from Fabio

1 files changed, 366 insertions, 0 deletions

diff --git a/drivers/i2c/ast2600_i2c.c b/drivers/i2c/ast2600_i2c.c
new file mode 100644
index 0000000000..e566b01fea
--- /dev/null
+++ b/drivers/i2c/ast2600_i2c.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright ASPEED Technology Inc.
+ */
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <log.h>
+#include <regmap.h>
+#include <reset.h>
+#include <asm/io.h>
+#include <linux/iopoll.h>
+#include "ast2600_i2c.h"
+
+/* Device private data */
+struct ast2600_i2c_priv {
+	struct clk clk;
+	struct ast2600_i2c_regs *regs;
+	void __iomem *global;
+};
+
+static int ast2600_i2c_read_data(struct ast2600_i2c_priv *priv, u8 chip_addr,
+				 u8 *buffer, size_t len, bool send_stop)
+{
+	int rx_cnt, ret = 0;
+	u32 cmd, isr;
+
+	for (rx_cnt = 0; rx_cnt < len; rx_cnt++, buffer++) {
+		cmd = I2CM_PKT_EN | I2CM_PKT_ADDR(chip_addr) |
+		      I2CM_RX_CMD;
+		if (!rx_cnt)
+			cmd |= I2CM_START_CMD;
+
+		if ((len - 1) == rx_cnt)
+			cmd |= I2CM_RX_CMD_LAST;
+
+		if (send_stop && ((len - 1) == rx_cnt))
+			cmd |= I2CM_STOP_CMD;
+
+		writel(cmd, &priv->regs->cmd_sts);
+
+		ret = readl_poll_timeout(&priv->regs->isr, isr,
+					 isr & I2CM_PKT_DONE,
+					 I2C_TIMEOUT_US);
+		if (ret)
+			return -ETIMEDOUT;
+
+		*buffer =
+			I2CC_GET_RX_BUFF(readl(&priv->regs->trx_buff));
+
+		writel(I2CM_PKT_DONE, &priv->regs->isr);
+
+		if (isr & I2CM_TX_NAK)
+			return -EREMOTEIO;
+	}
+
+	return 0;
+}
+
+static int ast2600_i2c_write_data(struct ast2600_i2c_priv *priv, u8 chip_addr,
+				  u8 *buffer, size_t len, bool send_stop)
+{
+	int tx_cnt, ret = 0;
+	u32 cmd, isr;
+
+	if (!len) {
+		cmd = I2CM_PKT_EN | I2CM_PKT_ADDR(chip_addr) |
+		      I2CM_START_CMD;
+		writel(cmd, &priv->regs->cmd_sts);
+		ret = readl_poll_timeout(&priv->regs->isr, isr,
+					 isr & I2CM_PKT_DONE,
+					 I2C_TIMEOUT_US);
+		if (ret)
+			return -ETIMEDOUT;
+
+		writel(I2CM_PKT_DONE, &priv->regs->isr);
+
+		if (isr & I2CM_TX_NAK)
+			return -EREMOTEIO;
+	}
+
+	for (tx_cnt = 0; tx_cnt < len; tx_cnt++, buffer++) {
+		cmd = I2CM_PKT_EN | I2CM_PKT_ADDR(chip_addr);
+		cmd |= I2CM_TX_CMD;
+
+		if (!tx_cnt)
+			cmd |= I2CM_START_CMD;
+
+		if (send_stop && ((len - 1) == tx_cnt))
+			cmd |= I2CM_STOP_CMD;
+
+		writel(*buffer, &priv->regs->trx_buff);
+		writel(cmd, &priv->regs->cmd_sts);
+		ret = readl_poll_timeout(&priv->regs->isr, isr,
+					 isr & I2CM_PKT_DONE,
+					 I2C_TIMEOUT_US);
+		if (ret)
+			return -ETIMEDOUT;
+
+		writel(I2CM_PKT_DONE, &priv->regs->isr);
+
+		if (isr & I2CM_TX_NAK)
+			return -EREMOTEIO;
+	}
+
+	return 0;
+}
+
+static int ast2600_i2c_deblock(struct udevice *dev)
+{
+	struct ast2600_i2c_priv *priv = dev_get_priv(dev);
+	u32 csr = readl(&priv->regs->cmd_sts);
+	u32 isr;
+	int ret;
+
+	/* reinit */
+	writel(0, &priv->regs->fun_ctrl);
+	/* Enable Master Mode. Assuming single-master */
+	writel(I2CC_BUS_AUTO_RELEASE | I2CC_MASTER_EN |
+		       I2CC_MULTI_MASTER_DIS,
+	       &priv->regs->fun_ctrl);
+
+	csr = readl(&priv->regs->cmd_sts);
+
+	if (!(csr & I2CC_SDA_LINE_STS) &&
+	    (csr & I2CC_SCL_LINE_STS)) {
+		debug("Bus stuck (%x), attempting recovery\n", csr);
+		writel(I2CM_RECOVER_CMD_EN, &priv->regs->cmd_sts);
+		ret = readl_poll_timeout(&priv->regs->isr, isr,
+					 isr & (I2CM_BUS_RECOVER_FAIL |
+						I2CM_BUS_RECOVER),
+					 I2C_TIMEOUT_US);
+		writel(~0, &priv->regs->isr);
+		if (ret)
+			return -EREMOTEIO;
+	}
+
+	return 0;
+}
+
+static int ast2600_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs)
+{
+	struct ast2600_i2c_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	if (readl(&priv->regs->trx_buff) & I2CC_BUS_BUSY_STS)
+		return -EREMOTEIO;
+
+	for (; nmsgs > 0; nmsgs--, msg++) {
+		if (msg->flags & I2C_M_RD) {
+			debug("i2c_read: chip=0x%x, len=0x%x, flags=0x%x\n",
+			      msg->addr, msg->len, msg->flags);
+			ret = ast2600_i2c_read_data(priv, msg->addr, msg->buf,
+						    msg->len, (nmsgs == 1));
+		} else {
+			debug("i2c_write: chip=0x%x, len=0x%x, flags=0x%x\n",
+			      msg->addr, msg->len, msg->flags);
+			ret = ast2600_i2c_write_data(priv, msg->addr, msg->buf,
+						     msg->len, (nmsgs == 1));
+		}
+		if (ret) {
+			debug("%s: error (%d)\n", __func__, ret);
+			return -EREMOTEIO;
+		}
+	}
+
+	return 0;
+}
+
+static int ast2600_i2c_set_speed(struct udevice *dev, unsigned int speed)
+{
+	struct ast2600_i2c_priv *priv = dev_get_priv(dev);
+	unsigned long base_clk1, base_clk2, base_clk3, base_clk4;
+	int multiply = 10;
+	int baseclk_idx;
+	u32 clk_div_reg;
+	u32 apb_clk;
+	u32 scl_low;
+	u32 scl_high;
+	int divisor;
+	int inc = 0;
+	u32 data;
+
+	debug("Setting speed for I2C%d to <%u>\n", dev->seq_, speed);
+	if (!speed) {
+		debug("No valid speed specified\n");
+		return -EINVAL;
+	}
+
+	apb_clk = clk_get_rate(&priv->clk);
+
+	clk_div_reg = readl(priv->global + I2CG_CLK_DIV_CTRL);
+
+	base_clk1 = (apb_clk * multiply) / (((GET_CLK1_DIV(clk_div_reg) + 2) * multiply) / 2);
+	base_clk2 = (apb_clk * multiply) / (((GET_CLK2_DIV(clk_div_reg) + 2) * multiply) / 2);
+	base_clk3 = (apb_clk * multiply) / (((GET_CLK3_DIV(clk_div_reg) + 2) * multiply) / 2);
+	base_clk4 = (apb_clk * multiply) / (((GET_CLK4_DIV(clk_div_reg) + 2) * multiply) / 2);
+
+	if ((apb_clk / speed) <= 32) {
+		baseclk_idx = 0;
+		divisor = DIV_ROUND_UP(apb_clk, speed);
+	} else if ((base_clk1 / speed) <= 32) {
+		baseclk_idx = 1;
+		divisor = DIV_ROUND_UP(base_clk1, speed);
+	} else if ((base_clk2 / speed) <= 32) {
+		baseclk_idx = 2;
+		divisor = DIV_ROUND_UP(base_clk2, speed);
+	} else if ((base_clk3 / speed) <= 32) {
+		baseclk_idx = 3;
+		divisor = DIV_ROUND_UP(base_clk3, speed);
+	} else {
+		baseclk_idx = 4;
+		divisor = DIV_ROUND_UP(base_clk4, speed);
+		inc = 0;
+		while ((divisor + inc) > 32) {
+			inc |= divisor & 0x1;
+			divisor >>= 1;
+			baseclk_idx++;
+		}
+		divisor += inc;
+	}
+	divisor = min_t(int, divisor, 32);
+	baseclk_idx &= 0xf;
+	scl_low = ((divisor * 9) / 16) - 1;
+	scl_low = min_t(u32, scl_low, 0xf);
+	scl_high = (divisor - scl_low - 2) & 0xf;
+	/* Divisor : Base Clock : tCKHighMin : tCK High : tCK Low  */
+	data = ((scl_high - 1) << 20) | (scl_high << 16) | (scl_low << 12) |
+	       baseclk_idx;
+	/* Set AC Timing */
+	writel(data, &priv->regs->ac_timing);
+
+	return 0;
+}
+
+static int ast2600_i2c_probe(struct udevice *dev)
+{
+	struct ast2600_i2c_priv *priv = dev_get_priv(dev);
+	ofnode i2c_global_node;
+
+	/* find global base address */
+	i2c_global_node = ofnode_get_parent(dev_ofnode(dev));
+	priv->global = (void *)ofnode_get_addr(i2c_global_node);
+	if (IS_ERR(priv->global)) {
+		debug("%s(): can't get global\n", __func__);
+		return PTR_ERR(priv->global);
+	}
+
+	/* Reset device */
+	writel(0, &priv->regs->fun_ctrl);
+	/* Enable Master Mode. Assuming single-master */
+	writel(I2CC_BUS_AUTO_RELEASE | I2CC_MASTER_EN |
+		       I2CC_MULTI_MASTER_DIS,
+	       &priv->regs->fun_ctrl);
+
+	writel(0, &priv->regs->ier);
+	/* Clear Interrupt */
+	writel(~0, &priv->regs->isr);
+
+	return 0;
+}
+
+static int ast2600_i2c_of_to_plat(struct udevice *dev)
+{
+	struct ast2600_i2c_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	priv->regs = dev_read_addr_ptr(dev);
+	if (!priv->regs)
+		return -EINVAL;
+
+	ret = clk_get_by_index(dev, 0, &priv->clk);
+	if (ret < 0) {
+		debug("%s: Can't get clock for %s: %d\n", __func__, dev->name,
+		      ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dm_i2c_ops ast2600_i2c_ops = {
+	.xfer = ast2600_i2c_xfer,
+	.deblock = ast2600_i2c_deblock,
+	.set_bus_speed = ast2600_i2c_set_speed,
+};
+
+static const struct udevice_id ast2600_i2c_ids[] = {
+	{ .compatible = "aspeed,ast2600-i2c" },
+	{},
+};
+
+U_BOOT_DRIVER(ast2600_i2c) = {
+	.name = "ast2600_i2c",
+	.id = UCLASS_I2C,
+	.of_match = ast2600_i2c_ids,
+	.probe = ast2600_i2c_probe,
+	.of_to_plat = ast2600_i2c_of_to_plat,
+	.priv_auto = sizeof(struct ast2600_i2c_priv),
+	.ops = &ast2600_i2c_ops,
+};
+
+struct ast2600_i2c_global_priv {
+	void __iomem *regs;
+	struct reset_ctl reset;
+};
+
+/*
+ * APB clk : 100Mhz
+ * div  : scl       : baseclk [APB/((div/2) + 1)] : tBuf [1/bclk * 16]
+ * I2CG10[31:24] base clk4 for i2c auto recovery timeout counter (0xC6)
+ * I2CG10[23:16] base clk3 for Standard-mode (100Khz) min tBuf 4.7us
+ * 0x3c : 100.8Khz  : 3.225Mhz                    : 4.96us
+ * 0x3d : 99.2Khz   : 3.174Mhz                    : 5.04us
+ * 0x3e : 97.65Khz  : 3.125Mhz                    : 5.12us
+ * 0x40 : 97.75Khz  : 3.03Mhz                     : 5.28us
+ * 0x41 : 99.5Khz   : 2.98Mhz                     : 5.36us (default)
+ * I2CG10[15:8] base clk2 for Fast-mode (400Khz) min tBuf 1.3us
+ * 0x12 : 400Khz    : 10Mhz                       : 1.6us
+ * I2CG10[7:0] base clk1 for Fast-mode Plus (1Mhz) min tBuf 0.5us
+ * 0x08 : 1Mhz      : 20Mhz                       : 0.8us
+ */
+
+static int aspeed_i2c_global_probe(struct udevice *dev)
+{
+	struct ast2600_i2c_global_priv *i2c_global = dev_get_priv(dev);
+	void __iomem *regs;
+	int ret = 0;
+
+	i2c_global->regs = dev_read_addr_ptr(dev);
+	if (!i2c_global->regs)
+		return -EINVAL;
+
+	debug("%s(dev=%p)\n", __func__, dev);
+
+	regs = i2c_global->regs;
+
+	ret = reset_get_by_index(dev, 0, &i2c_global->reset);
+	if (ret) {
+		printf("%s(): Failed to get reset signal\n", __func__);
+		return ret;
+	}
+
+	reset_deassert(&i2c_global->reset);
+
+	writel(GLOBAL_INIT, regs + I2CG_CTRL);
+	writel(I2CCG_DIV_CTRL, regs + I2CG_CLK_DIV_CTRL);
+
+	return 0;
+}
+
+static const struct udevice_id aspeed_i2c_global_ids[] = {
+	{	.compatible = "aspeed,ast2600-i2c-global",	},
+	{ }
+};
+
+U_BOOT_DRIVER(aspeed_i2c_global) = {
+	.name		= "aspeed_i2c_global",
+	.id			= UCLASS_MISC,
+	.of_match	= aspeed_i2c_global_ids,
+	.probe		= aspeed_i2c_global_probe,
+	.priv_auto  = sizeof(struct ast2600_i2c_global_priv),
+};