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7e22c85918
The following warning is seen in ocores_i2c.c in a 32-bit build: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Change to use dev_read_addr_ptr(). Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
639 lines
15 KiB
C
639 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ocores-i2c.c: I2C bus driver for OpenCores I2C controller
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* (https://opencores.org/projects/i2c)
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*
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* (C) Copyright Peter Korsgaard <peter@korsgaard.com>
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*
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* Copyright (C) 2020 SiFive, Inc.
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* Pragnesh Patel <pragnesh.patel@sifive.com>
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*
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* Support for the GRLIB port of the controller by
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* Andreas Larsson <andreas@gaisler.com>
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*/
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#include <common.h>
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#include <asm/global_data.h>
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#include <asm/io.h>
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#include <clk.h>
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <i2c.h>
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#include <linux/io.h>
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#include <linux/compat.h>
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#include <linux/log2.h>
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#include <linux/delay.h>
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/* registers */
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#define OCI2C_PRELOW 0
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#define OCI2C_PREHIGH 1
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#define OCI2C_CONTROL 2
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#define OCI2C_DATA 3
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#define OCI2C_CMD 4 /* write only */
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#define OCI2C_STATUS 4 /* read only, same address as OCI2C_CMD */
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#define OCI2C_CTRL_IEN 0x40
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#define OCI2C_CTRL_EN 0x80
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#define OCI2C_CMD_START 0x91
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#define OCI2C_CMD_STOP 0x41
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#define OCI2C_CMD_READ 0x21
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#define OCI2C_CMD_WRITE 0x11
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#define OCI2C_CMD_READ_ACK 0x21
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#define OCI2C_CMD_READ_NACK 0x29
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#define OCI2C_CMD_IACK 0x01
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#define OCI2C_STAT_IF 0x01
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#define OCI2C_STAT_TIP 0x02
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#define OCI2C_STAT_ARBLOST 0x20
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#define OCI2C_STAT_BUSY 0x40
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#define OCI2C_STAT_NACK 0x80
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#define STATE_DONE 0
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#define STATE_START 1
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#define STATE_WRITE 2
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#define STATE_READ 3
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#define STATE_ERROR 4
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#define TYPE_OCORES 0
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#define TYPE_GRLIB 1
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#define OCORES_FLAG_BROKEN_IRQ BIT(1) /* Broken IRQ for FU540-C000 SoC */
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struct ocores_i2c_bus {
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void __iomem *base;
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u32 reg_shift;
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u32 reg_io_width;
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unsigned long flags;
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struct i2c_msg *msg;
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int pos;
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int nmsgs;
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int state; /* see STATE_ */
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struct clk clk;
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int ip_clk_khz;
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int bus_clk_khz;
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void (*setreg)(struct ocores_i2c_bus *i2c, int reg, u8 value);
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u8 (*getreg)(struct ocores_i2c_bus *i2c, int reg);
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};
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DECLARE_GLOBAL_DATA_PTR;
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/* Boolean attribute values */
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enum {
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FALSE = 0,
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TRUE,
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};
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static void oc_setreg_8(struct ocores_i2c_bus *i2c, int reg, u8 value)
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{
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writeb(value, i2c->base + (reg << i2c->reg_shift));
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}
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static void oc_setreg_16(struct ocores_i2c_bus *i2c, int reg, u8 value)
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{
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writew(value, i2c->base + (reg << i2c->reg_shift));
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}
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static void oc_setreg_32(struct ocores_i2c_bus *i2c, int reg, u8 value)
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{
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writel(value, i2c->base + (reg << i2c->reg_shift));
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}
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static void oc_setreg_16be(struct ocores_i2c_bus *i2c, int reg, u8 value)
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{
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out_be16(i2c->base + (reg << i2c->reg_shift), value);
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}
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static void oc_setreg_32be(struct ocores_i2c_bus *i2c, int reg, u8 value)
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{
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out_be32(i2c->base + (reg << i2c->reg_shift), value);
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}
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static inline u8 oc_getreg_8(struct ocores_i2c_bus *i2c, int reg)
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{
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return readb(i2c->base + (reg << i2c->reg_shift));
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}
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static inline u8 oc_getreg_16(struct ocores_i2c_bus *i2c, int reg)
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{
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return readw(i2c->base + (reg << i2c->reg_shift));
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}
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static inline u8 oc_getreg_32(struct ocores_i2c_bus *i2c, int reg)
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{
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return readl(i2c->base + (reg << i2c->reg_shift));
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}
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static inline u8 oc_getreg_16be(struct ocores_i2c_bus *i2c, int reg)
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{
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return in_be16(i2c->base + (reg << i2c->reg_shift));
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}
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static inline u8 oc_getreg_32be(struct ocores_i2c_bus *i2c, int reg)
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{
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return in_be32(i2c->base + (reg << i2c->reg_shift));
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}
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static inline void oc_setreg(struct ocores_i2c_bus *i2c, int reg, u8 value)
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{
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i2c->setreg(i2c, reg, value);
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}
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static inline u8 oc_getreg(struct ocores_i2c_bus *i2c, int reg)
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{
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return i2c->getreg(i2c, reg);
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}
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static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg)
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{
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return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0);
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}
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static void ocores_process(struct ocores_i2c_bus *i2c, u8 stat)
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{
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struct i2c_msg *msg = i2c->msg;
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if (i2c->state == STATE_DONE || i2c->state == STATE_ERROR) {
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/* stop has been sent */
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oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK);
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return;
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}
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/* error? */
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if (stat & OCI2C_STAT_ARBLOST) {
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i2c->state = STATE_ERROR;
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oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP);
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return;
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}
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if (i2c->state == STATE_START || i2c->state == STATE_WRITE) {
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i2c->state =
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(msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE;
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if (stat & OCI2C_STAT_NACK) {
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i2c->state = STATE_ERROR;
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oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP);
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return;
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}
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} else {
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msg->buf[i2c->pos++] = oc_getreg(i2c, OCI2C_DATA);
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}
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/* end of msg? */
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if (i2c->pos == msg->len) {
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i2c->nmsgs--;
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i2c->msg++;
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i2c->pos = 0;
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msg = i2c->msg;
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if (i2c->nmsgs) { /* end? */
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/* send start? */
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if (!(msg->flags & I2C_M_NOSTART)) {
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u8 addr = i2c_8bit_addr_from_msg(msg);
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i2c->state = STATE_START;
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oc_setreg(i2c, OCI2C_DATA, addr);
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oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START);
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return;
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}
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i2c->state = (msg->flags & I2C_M_RD)
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? STATE_READ : STATE_WRITE;
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} else {
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i2c->state = STATE_DONE;
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oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP);
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return;
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}
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}
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if (i2c->state == STATE_READ) {
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oc_setreg(i2c, OCI2C_CMD, i2c->pos == (msg->len - 1) ?
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OCI2C_CMD_READ_NACK : OCI2C_CMD_READ_ACK);
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} else {
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oc_setreg(i2c, OCI2C_DATA, msg->buf[i2c->pos++]);
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oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_WRITE);
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}
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}
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static irqreturn_t ocores_isr(int irq, void *dev_id)
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{
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struct ocores_i2c_bus *i2c = dev_id;
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u8 stat = oc_getreg(i2c, OCI2C_STATUS);
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if (i2c->flags & OCORES_FLAG_BROKEN_IRQ) {
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if ((stat & OCI2C_STAT_IF) && !(stat & OCI2C_STAT_BUSY))
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return IRQ_NONE;
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} else if (!(stat & OCI2C_STAT_IF)) {
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return IRQ_NONE;
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}
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ocores_process(i2c, stat);
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return IRQ_HANDLED;
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}
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/**
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* Wait until something change in a given register
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* @i2c: ocores I2C device instance
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* @reg: register to query
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* @mask: bitmask to apply on register value
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* @val: expected result
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* @msec: timeout in msec
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*
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* Timeout is necessary to avoid to stay here forever when the chip
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* does not answer correctly.
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*
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* Return: 0 on success, -ETIMEDOUT on timeout
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*/
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static int ocores_wait(struct ocores_i2c_bus *i2c,
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int reg, u8 mask, u8 val,
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const unsigned long msec)
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{
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u32 count = 0;
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while (1) {
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u8 status = oc_getreg(i2c, reg);
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if ((status & mask) == val)
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break;
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udelay(1);
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count += 1;
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if (count == (1000 * msec))
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return -ETIMEDOUT;
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}
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return 0;
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}
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/**
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* Wait until is possible to process some data
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* @i2c: ocores I2C device instance
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*
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* Used when the device is in polling mode (interrupts disabled).
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*
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* Return: 0 on success, -ETIMEDOUT on timeout
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*/
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static int ocores_poll_wait(struct ocores_i2c_bus *i2c)
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{
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u8 mask;
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int err;
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if (i2c->state == STATE_DONE || i2c->state == STATE_ERROR) {
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/* transfer is over */
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mask = OCI2C_STAT_BUSY;
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} else {
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/* on going transfer */
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mask = OCI2C_STAT_TIP;
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/*
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* We wait for the data to be transferred (8bit),
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* then we start polling on the ACK/NACK bit
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*/
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udelay((8 * 1000) / i2c->bus_clk_khz);
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}
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/*
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* once we are here we expect to get the expected result immediately
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* so if after 1ms we timeout then something is broken.
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*/
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err = ocores_wait(i2c, OCI2C_STATUS, mask, 0, 1);
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if (err)
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debug("%s: STATUS timeout, bit 0x%x did not clear in 1ms\n",
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__func__, mask);
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return err;
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}
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/**
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* It handles an IRQ-less transfer
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* @i2c: ocores I2C device instance
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*
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* Even if IRQ are disabled, the I2C OpenCore IP behavior is exactly the same
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* (only that IRQ are not produced). This means that we can re-use entirely
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* ocores_isr(), we just add our polling code around it.
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*
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* It can run in atomic context
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*/
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static void ocores_process_polling(struct ocores_i2c_bus *i2c)
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{
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while (1) {
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irqreturn_t ret;
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int err;
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err = ocores_poll_wait(i2c);
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if (err) {
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i2c->state = STATE_ERROR;
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break; /* timeout */
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}
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ret = ocores_isr(-1, i2c);
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if (ret == IRQ_NONE) {
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break; /* all messages have been transferred */
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} else {
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if (i2c->flags & OCORES_FLAG_BROKEN_IRQ)
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if (i2c->state == STATE_DONE)
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break;
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}
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}
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}
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static int ocores_xfer_core(struct ocores_i2c_bus *i2c,
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struct i2c_msg *msgs, int num, bool polling)
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{
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u8 ctrl;
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ctrl = oc_getreg(i2c, OCI2C_CONTROL);
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if (polling)
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oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~OCI2C_CTRL_IEN);
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i2c->msg = msgs;
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i2c->pos = 0;
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i2c->nmsgs = num;
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i2c->state = STATE_START;
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oc_setreg(i2c, OCI2C_DATA, i2c_8bit_addr_from_msg(i2c->msg));
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oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START);
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if (polling)
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ocores_process_polling(i2c);
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return (i2c->state == STATE_DONE) ? num : -EIO;
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}
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static int ocores_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs)
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{
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struct ocores_i2c_bus *bus = dev_get_priv(dev);
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int ret;
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debug("i2c_xfer: %d messages\n", nmsgs);
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ret = ocores_xfer_core(bus, msg, nmsgs, 1);
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if (ret != nmsgs) {
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debug("i2c_write: error sending\n");
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return -EREMOTEIO;
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}
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return 0;
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}
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static int ocores_i2c_enable_clk(struct udevice *dev)
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{
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struct ocores_i2c_bus *bus = dev_get_priv(dev);
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ulong clk_rate;
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int ret;
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ret = clk_get_by_index(dev, 0, &bus->clk);
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if (ret)
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return -EINVAL;
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ret = clk_enable(&bus->clk);
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if (ret)
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return ret;
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clk_rate = clk_get_rate(&bus->clk);
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if (!clk_rate)
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return -EINVAL;
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bus->ip_clk_khz = clk_rate / 1000;
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clk_free(&bus->clk);
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return 0;
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}
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static int ocores_init(struct udevice *dev, struct ocores_i2c_bus *bus)
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{
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int prescale;
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int diff;
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u8 ctrl = oc_getreg(bus, OCI2C_CONTROL);
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/* make sure the device is disabled */
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ctrl &= ~(OCI2C_CTRL_EN | OCI2C_CTRL_IEN);
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oc_setreg(bus, OCI2C_CONTROL, ctrl);
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prescale = (bus->ip_clk_khz / (5 * bus->bus_clk_khz)) - 1;
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prescale = clamp(prescale, 0, 0xffff);
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diff = bus->ip_clk_khz / (5 * (prescale + 1)) - bus->bus_clk_khz;
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if (abs(diff) > bus->bus_clk_khz / 10) {
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debug("Unsupported clock settings: core: %d KHz, bus: %d KHz\n",
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bus->ip_clk_khz, bus->bus_clk_khz);
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return -EINVAL;
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}
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oc_setreg(bus, OCI2C_PRELOW, prescale & 0xff);
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oc_setreg(bus, OCI2C_PREHIGH, prescale >> 8);
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/* Init the device */
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oc_setreg(bus, OCI2C_CMD, OCI2C_CMD_IACK);
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oc_setreg(bus, OCI2C_CONTROL, ctrl | OCI2C_CTRL_EN);
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return 0;
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}
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/*
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* Read and write functions for the GRLIB port of the controller. Registers are
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* 32-bit big endian and the PRELOW and PREHIGH registers are merged into one
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* register. The subsequent registers have their offsets decreased accordingly.
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*/
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static u8 oc_getreg_grlib(struct ocores_i2c_bus *i2c, int reg)
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{
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u32 rd;
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int rreg = reg;
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if (reg != OCI2C_PRELOW)
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rreg--;
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rd = in_be32(i2c->base + (rreg << i2c->reg_shift));
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if (reg == OCI2C_PREHIGH)
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return (u8)(rd >> 8);
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else
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return (u8)rd;
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}
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static void oc_setreg_grlib(struct ocores_i2c_bus *i2c, int reg, u8 value)
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{
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u32 curr, wr;
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int rreg = reg;
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if (reg != OCI2C_PRELOW)
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rreg--;
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if (reg == OCI2C_PRELOW || reg == OCI2C_PREHIGH) {
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curr = in_be32(i2c->base + (rreg << i2c->reg_shift));
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if (reg == OCI2C_PRELOW)
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wr = (curr & 0xff00) | value;
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else
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wr = (((u32)value) << 8) | (curr & 0xff);
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} else {
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wr = value;
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}
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out_be32(i2c->base + (rreg << i2c->reg_shift), wr);
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}
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static int ocores_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
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{
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int prescale;
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int diff;
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struct ocores_i2c_bus *bus = dev_get_priv(dev);
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/* speed in Khz */
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speed = speed / 1000;
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prescale = (bus->ip_clk_khz / (5 * speed)) - 1;
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prescale = clamp(prescale, 0, 0xffff);
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diff = bus->ip_clk_khz / (5 * (prescale + 1)) - speed;
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if (abs(diff) > speed / 10) {
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debug("Unsupported clock settings: core: %d KHz, bus: %d KHz\n",
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bus->ip_clk_khz, speed);
|
|
return -EINVAL;
|
|
}
|
|
|
|
oc_setreg(bus, OCI2C_PRELOW, prescale & 0xff);
|
|
oc_setreg(bus, OCI2C_PREHIGH, prescale >> 8);
|
|
|
|
bus->bus_clk_khz = speed;
|
|
return 0;
|
|
}
|
|
|
|
int ocores_i2c_get_bus_speed(struct udevice *dev)
|
|
{
|
|
struct ocores_i2c_bus *bus = dev_get_priv(dev);
|
|
|
|
return (bus->bus_clk_khz * 1000);
|
|
}
|
|
|
|
static const struct dm_i2c_ops ocores_i2c_ops = {
|
|
.xfer = ocores_i2c_xfer,
|
|
.set_bus_speed = ocores_i2c_set_bus_speed,
|
|
.get_bus_speed = ocores_i2c_get_bus_speed,
|
|
};
|
|
|
|
static int ocores_i2c_probe(struct udevice *dev)
|
|
{
|
|
struct ocores_i2c_bus *bus = dev_get_priv(dev);
|
|
bool clock_frequency_present;
|
|
u32 val;
|
|
u32 clock_frequency_khz;
|
|
int ret;
|
|
|
|
bus->base = dev_read_addr_ptr(dev);
|
|
|
|
if (dev_read_u32(dev, "reg-shift", &bus->reg_shift)) {
|
|
/* no 'reg-shift', check for deprecated 'regstep' */
|
|
ret = dev_read_u32(dev, "regstep", &val);
|
|
if (ret) {
|
|
dev_err(dev,
|
|
"missing both reg-shift and regstep property: %d\n", ret);
|
|
return -EINVAL;
|
|
} else {
|
|
bus->reg_shift = ilog2(val);
|
|
dev_warn(dev,
|
|
"regstep property deprecated, use reg-shift\n");
|
|
}
|
|
}
|
|
|
|
if (dev_read_u32(dev, "clock-frequency", &val)) {
|
|
bus->bus_clk_khz = 100;
|
|
clock_frequency_present = FALSE;
|
|
} else {
|
|
bus->bus_clk_khz = val / 1000;
|
|
clock_frequency_khz = val / 1000;
|
|
clock_frequency_present = TRUE;
|
|
}
|
|
|
|
ret = ocores_i2c_enable_clk(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (bus->ip_clk_khz == 0) {
|
|
if (dev_read_u32(dev, "opencores,ip-clock-frequency", &val)) {
|
|
if (!clock_frequency_present) {
|
|
dev_err(dev,
|
|
"Missing required parameter 'opencores,ip-clock-frequency'\n");
|
|
clk_disable(&bus->clk);
|
|
return -ENODEV;
|
|
}
|
|
|
|
bus->ip_clk_khz = clock_frequency_khz;
|
|
dev_warn(dev,
|
|
"Deprecated usage of the 'clock-frequency' property, please update to 'opencores,ip-clock-frequency'\n");
|
|
} else {
|
|
bus->ip_clk_khz = val / 1000;
|
|
if (clock_frequency_present)
|
|
bus->bus_clk_khz = clock_frequency_khz;
|
|
}
|
|
}
|
|
|
|
bus->reg_io_width = dev_read_u32_default(dev, "reg-io-width", 1);
|
|
|
|
if (dev_get_driver_data(dev) == TYPE_GRLIB) {
|
|
debug("GRLIB variant of i2c-ocores\n");
|
|
bus->setreg = oc_setreg_grlib;
|
|
bus->getreg = oc_getreg_grlib;
|
|
}
|
|
|
|
if (!bus->setreg || !bus->getreg) {
|
|
bool be = (cpu_to_be32(0x12345678) == 0x12345678);
|
|
|
|
switch (bus->reg_io_width) {
|
|
case 1:
|
|
bus->setreg = oc_setreg_8;
|
|
bus->getreg = oc_getreg_8;
|
|
break;
|
|
|
|
case 2:
|
|
bus->setreg = be ? oc_setreg_16be : oc_setreg_16;
|
|
bus->getreg = be ? oc_getreg_16be : oc_getreg_16;
|
|
break;
|
|
|
|
case 4:
|
|
bus->setreg = be ? oc_setreg_32be : oc_setreg_32;
|
|
bus->getreg = be ? oc_getreg_32be : oc_getreg_32;
|
|
break;
|
|
|
|
default:
|
|
debug("Unsupported I/O width (%d)\n",
|
|
bus->reg_io_width);
|
|
ret = -EINVAL;
|
|
goto err_clk;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set OCORES_FLAG_BROKEN_IRQ to enable workaround for
|
|
* FU540-C000 SoC in polling mode.
|
|
* Since the SoC does have an interrupt, its DT has an interrupt
|
|
* property - But this should be bypassed as the IRQ logic in this
|
|
* SoC is broken.
|
|
*/
|
|
|
|
if (device_is_compatible(dev, "sifive,fu540-c000-i2c"))
|
|
bus->flags |= OCORES_FLAG_BROKEN_IRQ;
|
|
|
|
ret = ocores_init(dev, bus);
|
|
if (ret)
|
|
goto err_clk;
|
|
|
|
return 0;
|
|
|
|
err_clk:
|
|
clk_disable(&bus->clk);
|
|
return ret;
|
|
}
|
|
|
|
static const struct udevice_id ocores_i2c_ids[] = {
|
|
{ .compatible = "opencores,i2c-ocores", .data = TYPE_OCORES },
|
|
{ .compatible = "aeroflexgaisler,i2cmst", .data = TYPE_GRLIB },
|
|
{ .compatible = "sifive,fu540-c000-i2c" },
|
|
{ .compatible = "sifive,i2c0" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(i2c_ocores) = {
|
|
.name = "i2c_ocores",
|
|
.id = UCLASS_I2C,
|
|
.of_match = ocores_i2c_ids,
|
|
.probe = ocores_i2c_probe,
|
|
.priv_auto = sizeof(struct ocores_i2c_bus),
|
|
.ops = &ocores_i2c_ops,
|
|
};
|