From af1a266670d040d2f4083ff309d732d648afba2a Mon Sep 17 00:00:00 2001
From: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 14:33:42 +0000
Subject: Add submodule dependency files
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
---
roms/u-boot/drivers/i2c/meson_i2c.c | 313 ++++++++++++++++++++++++++++++++++++
1 file changed, 313 insertions(+)
create mode 100644 roms/u-boot/drivers/i2c/meson_i2c.c
(limited to 'roms/u-boot/drivers/i2c/meson_i2c.c')
diff --git a/roms/u-boot/drivers/i2c/meson_i2c.c b/roms/u-boot/drivers/i2c/meson_i2c.c
new file mode 100644
index 000000000..434e3461b
--- /dev/null
+++ b/roms/u-boot/drivers/i2c/meson_i2c.c
@@ -0,0 +1,313 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2017 - Beniamino Galvani <b.galvani@gmail.com>
+ */
+#include <common.h>
+#include <log.h>
+#include <asm/io.h>
+#include <clk.h>
+#include <dm.h>
+#include <i2c.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+
+#define I2C_TIMEOUT_MS 100
+
+/* Control register fields */
+#define REG_CTRL_START BIT(0)
+#define REG_CTRL_ACK_IGNORE BIT(1)
+#define REG_CTRL_STATUS BIT(2)
+#define REG_CTRL_ERROR BIT(3)
+#define REG_CTRL_CLKDIV_SHIFT 12
+#define REG_CTRL_CLKDIV_MASK GENMASK(21, 12)
+#define REG_CTRL_CLKDIVEXT_SHIFT 28
+#define REG_CTRL_CLKDIVEXT_MASK GENMASK(29, 28)
+
+enum {
+ TOKEN_END = 0,
+ TOKEN_START,
+ TOKEN_SLAVE_ADDR_WRITE,
+ TOKEN_SLAVE_ADDR_READ,
+ TOKEN_DATA,
+ TOKEN_DATA_LAST,
+ TOKEN_STOP,
+};
+
+struct i2c_regs {
+ u32 ctrl;
+ u32 slave_addr;
+ u32 tok_list0;
+ u32 tok_list1;
+ u32 tok_wdata0;
+ u32 tok_wdata1;
+ u32 tok_rdata0;
+ u32 tok_rdata1;
+};
+
+struct meson_i2c_data {
+ unsigned char div_factor;
+};
+
+struct meson_i2c {
+ const struct meson_i2c_data *data;
+ struct clk clk;
+ struct i2c_regs *regs;
+ struct i2c_msg *msg; /* Current I2C message */
+ bool last; /* Whether the message is the last */
+ uint count; /* Number of bytes in the current transfer */
+ uint pos; /* Position of current transfer in message */
+ u32 tokens[2]; /* Sequence of tokens to be written */
+ uint num_tokens; /* Number of tokens to be written */
+};
+
+static void meson_i2c_reset_tokens(struct meson_i2c *i2c)
+{
+ i2c->tokens[0] = 0;
+ i2c->tokens[1] = 0;
+ i2c->num_tokens = 0;
+}
+
+static void meson_i2c_add_token(struct meson_i2c *i2c, int token)
+{
+ if (i2c->num_tokens < 8)
+ i2c->tokens[0] |= (token & 0xf) << (i2c->num_tokens * 4);
+ else
+ i2c->tokens[1] |= (token & 0xf) << ((i2c->num_tokens % 8) * 4);
+
+ i2c->num_tokens++;
+}
+
+/*
+ * Retrieve data for the current transfer (which can be at most 8
+ * bytes) from the device internal buffer.
+ */
+static void meson_i2c_get_data(struct meson_i2c *i2c, u8 *buf, int len)
+{
+ u32 rdata0, rdata1;
+ int i;
+
+ rdata0 = readl(&i2c->regs->tok_rdata0);
+ rdata1 = readl(&i2c->regs->tok_rdata1);
+
+ debug("meson i2c: read data %08x %08x len %d\n", rdata0, rdata1, len);
+
+ for (i = 0; i < min(4, len); i++)
+ *buf++ = (rdata0 >> i * 8) & 0xff;
+
+ for (i = 4; i < min(8, len); i++)
+ *buf++ = (rdata1 >> (i - 4) * 8) & 0xff;
+}
+
+/*
+ * Write data for the current transfer (which can be at most 8 bytes)
+ * to the device internal buffer.
+ */
+static void meson_i2c_put_data(struct meson_i2c *i2c, u8 *buf, int len)
+{
+ u32 wdata0 = 0, wdata1 = 0;
+ int i;
+
+ for (i = 0; i < min(4, len); i++)
+ wdata0 |= *buf++ << (i * 8);
+
+ for (i = 4; i < min(8, len); i++)
+ wdata1 |= *buf++ << ((i - 4) * 8);
+
+ writel(wdata0, &i2c->regs->tok_wdata0);
+ writel(wdata1, &i2c->regs->tok_wdata1);
+
+ debug("meson i2c: write data %08x %08x len %d\n", wdata0, wdata1, len);
+}
+
+/*
+ * Prepare the next transfer: pick the next 8 bytes in the remaining
+ * part of message and write tokens and data (if needed) to the
+ * device.
+ */
+static void meson_i2c_prepare_xfer(struct meson_i2c *i2c)
+{
+ bool write = !(i2c->msg->flags & I2C_M_RD);
+ int i;
+
+ i2c->count = min(i2c->msg->len - i2c->pos, 8u);
+
+ for (i = 0; i + 1 < i2c->count; i++)
+ meson_i2c_add_token(i2c, TOKEN_DATA);
+
+ if (i2c->count) {
+ if (write || i2c->pos + i2c->count < i2c->msg->len)
+ meson_i2c_add_token(i2c, TOKEN_DATA);
+ else
+ meson_i2c_add_token(i2c, TOKEN_DATA_LAST);
+ }
+
+ if (write)
+ meson_i2c_put_data(i2c, i2c->msg->buf + i2c->pos, i2c->count);
+
+ if (i2c->last && i2c->pos + i2c->count >= i2c->msg->len)
+ meson_i2c_add_token(i2c, TOKEN_STOP);
+
+ writel(i2c->tokens[0], &i2c->regs->tok_list0);
+ writel(i2c->tokens[1], &i2c->regs->tok_list1);
+}
+
+static void meson_i2c_do_start(struct meson_i2c *i2c, struct i2c_msg *msg)
+{
+ int token;
+
+ token = (msg->flags & I2C_M_RD) ? TOKEN_SLAVE_ADDR_READ :
+ TOKEN_SLAVE_ADDR_WRITE;
+
+ writel(msg->addr << 1, &i2c->regs->slave_addr);
+ meson_i2c_add_token(i2c, TOKEN_START);
+ meson_i2c_add_token(i2c, token);
+}
+
+static int meson_i2c_xfer_msg(struct meson_i2c *i2c, struct i2c_msg *msg,
+ int last)
+{
+ ulong start;
+
+ debug("meson i2c: %s addr %u len %u\n",
+ (msg->flags & I2C_M_RD) ? "read" : "write",
+ msg->addr, msg->len);
+
+ i2c->msg = msg;
+ i2c->last = last;
+ i2c->pos = 0;
+ i2c->count = 0;
+
+ meson_i2c_reset_tokens(i2c);
+ meson_i2c_do_start(i2c, msg);
+
+ do {
+ meson_i2c_prepare_xfer(i2c);
+
+ /* start the transfer */
+ setbits_le32(&i2c->regs->ctrl, REG_CTRL_START);
+ start = get_timer(0);
+ while (readl(&i2c->regs->ctrl) & REG_CTRL_STATUS) {
+ if (get_timer(start) > I2C_TIMEOUT_MS) {
+ clrbits_le32(&i2c->regs->ctrl, REG_CTRL_START);
+ debug("meson i2c: timeout\n");
+ return -ETIMEDOUT;
+ }
+ udelay(1);
+ }
+ meson_i2c_reset_tokens(i2c);
+ clrbits_le32(&i2c->regs->ctrl, REG_CTRL_START);
+
+ if (readl(&i2c->regs->ctrl) & REG_CTRL_ERROR) {
+ debug("meson i2c: error\n");
+ return -EREMOTEIO;
+ }
+
+ if ((msg->flags & I2C_M_RD) && i2c->count) {
+ meson_i2c_get_data(i2c, i2c->msg->buf + i2c->pos,
+ i2c->count);
+ }
+ i2c->pos += i2c->count;
+ } while (i2c->pos < msg->len);
+
+ return 0;
+}
+
+static int meson_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
+ int nmsgs)
+{
+ struct meson_i2c *i2c = dev_get_priv(bus);
+ int i, ret = 0;
+
+ for (i = 0; i < nmsgs; i++) {
+ ret = meson_i2c_xfer_msg(i2c, msg + i, i == nmsgs - 1);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int meson_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
+{
+ struct meson_i2c *i2c = dev_get_priv(bus);
+ ulong clk_rate;
+ unsigned int div;
+
+ clk_rate = clk_get_rate(&i2c->clk);
+ if (IS_ERR_VALUE(clk_rate))
+ return -EINVAL;
+
+ div = DIV_ROUND_UP(clk_rate, speed * i2c->data->div_factor);
+
+ /* clock divider has 12 bits */
+ if (div >= (1 << 12)) {
+ debug("meson i2c: requested bus frequency too low\n");
+ div = (1 << 12) - 1;
+ }
+
+ clrsetbits_le32(&i2c->regs->ctrl, REG_CTRL_CLKDIV_MASK,
+ (div & GENMASK(9, 0)) << REG_CTRL_CLKDIV_SHIFT);
+
+ clrsetbits_le32(&i2c->regs->ctrl, REG_CTRL_CLKDIVEXT_MASK,
+ (div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT);
+
+ debug("meson i2c: set clk %u, src %lu, div %u\n", speed, clk_rate, div);
+
+ return 0;
+}
+
+static int meson_i2c_probe(struct udevice *bus)
+{
+ struct meson_i2c *i2c = dev_get_priv(bus);
+ int ret;
+
+ i2c->data = (const struct meson_i2c_data *)dev_get_driver_data(bus);
+
+ ret = clk_get_by_index(bus, 0, &i2c->clk);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_enable(&i2c->clk);
+ if (ret)
+ return ret;
+
+ i2c->regs = dev_read_addr_ptr(bus);
+ clrbits_le32(&i2c->regs->ctrl, REG_CTRL_START);
+
+ return 0;
+}
+
+static const struct dm_i2c_ops meson_i2c_ops = {
+ .xfer = meson_i2c_xfer,
+ .set_bus_speed = meson_i2c_set_bus_speed,
+};
+
+static const struct meson_i2c_data i2c_meson6_data = {
+ .div_factor = 4,
+};
+
+static const struct meson_i2c_data i2c_gxbb_data = {
+ .div_factor = 4,
+};
+
+static const struct meson_i2c_data i2c_axg_data = {
+ .div_factor = 3,
+};
+
+static const struct udevice_id meson_i2c_ids[] = {
+ {.compatible = "amlogic,meson6-i2c", .data = (ulong)&i2c_meson6_data},
+ {.compatible = "amlogic,meson-gx-i2c", .data = (ulong)&i2c_gxbb_data},
+ {.compatible = "amlogic,meson-gxbb-i2c", .data = (ulong)&i2c_gxbb_data},
+ {.compatible = "amlogic,meson-axg-i2c", .data = (ulong)&i2c_axg_data},
+ {}
+};
+
+U_BOOT_DRIVER(i2c_meson) = {
+ .name = "i2c_meson",
+ .id = UCLASS_I2C,
+ .of_match = meson_i2c_ids,
+ .probe = meson_i2c_probe,
+ .priv_auto = sizeof(struct meson_i2c),
+ .ops = &meson_i2c_ops,
+};
--
cgit