523 lines
15 KiB
C
523 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* HiSilicon I2C Controller Driver for Kunpeng SoC
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*
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* Copyright (c) 2021 HiSilicon Technologies Co., Ltd.
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*/
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#include <linux/bits.h>
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#include <linux/bitfield.h>
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#include <linux/completion.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/units.h>
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#define HISI_I2C_FRAME_CTRL 0x0000
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#define HISI_I2C_FRAME_CTRL_SPEED_MODE GENMASK(1, 0)
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#define HISI_I2C_FRAME_CTRL_ADDR_TEN BIT(2)
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#define HISI_I2C_SLV_ADDR 0x0004
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#define HISI_I2C_SLV_ADDR_VAL GENMASK(9, 0)
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#define HISI_I2C_SLV_ADDR_GC_S_MODE BIT(10)
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#define HISI_I2C_SLV_ADDR_GC_S_EN BIT(11)
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#define HISI_I2C_CMD_TXDATA 0x0008
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#define HISI_I2C_CMD_TXDATA_DATA GENMASK(7, 0)
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#define HISI_I2C_CMD_TXDATA_RW BIT(8)
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#define HISI_I2C_CMD_TXDATA_P_EN BIT(9)
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#define HISI_I2C_CMD_TXDATA_SR_EN BIT(10)
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#define HISI_I2C_RXDATA 0x000c
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#define HISI_I2C_RXDATA_DATA GENMASK(7, 0)
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#define HISI_I2C_SS_SCL_HCNT 0x0010
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#define HISI_I2C_SS_SCL_LCNT 0x0014
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#define HISI_I2C_FS_SCL_HCNT 0x0018
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#define HISI_I2C_FS_SCL_LCNT 0x001c
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#define HISI_I2C_HS_SCL_HCNT 0x0020
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#define HISI_I2C_HS_SCL_LCNT 0x0024
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#define HISI_I2C_FIFO_CTRL 0x0028
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#define HISI_I2C_FIFO_RX_CLR BIT(0)
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#define HISI_I2C_FIFO_TX_CLR BIT(1)
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#define HISI_I2C_FIFO_RX_AF_THRESH GENMASK(7, 2)
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#define HISI_I2C_FIFO_TX_AE_THRESH GENMASK(13, 8)
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#define HISI_I2C_FIFO_STATE 0x002c
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#define HISI_I2C_FIFO_STATE_RX_RERR BIT(0)
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#define HISI_I2C_FIFO_STATE_RX_WERR BIT(1)
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#define HISI_I2C_FIFO_STATE_RX_EMPTY BIT(3)
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#define HISI_I2C_FIFO_STATE_TX_RERR BIT(6)
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#define HISI_I2C_FIFO_STATE_TX_WERR BIT(7)
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#define HISI_I2C_FIFO_STATE_TX_FULL BIT(11)
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#define HISI_I2C_SDA_HOLD 0x0030
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#define HISI_I2C_SDA_HOLD_TX GENMASK(15, 0)
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#define HISI_I2C_SDA_HOLD_RX GENMASK(23, 16)
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#define HISI_I2C_FS_SPK_LEN 0x0038
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#define HISI_I2C_FS_SPK_LEN_CNT GENMASK(7, 0)
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#define HISI_I2C_HS_SPK_LEN 0x003c
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#define HISI_I2C_HS_SPK_LEN_CNT GENMASK(7, 0)
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#define HISI_I2C_INT_MSTAT 0x0044
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#define HISI_I2C_INT_CLR 0x0048
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#define HISI_I2C_INT_MASK 0x004C
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#define HISI_I2C_TRANS_STATE 0x0050
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#define HISI_I2C_TRANS_ERR 0x0054
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#define HISI_I2C_VERSION 0x0058
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#define HISI_I2C_INT_ALL GENMASK(4, 0)
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#define HISI_I2C_INT_TRANS_CPLT BIT(0)
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#define HISI_I2C_INT_TRANS_ERR BIT(1)
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#define HISI_I2C_INT_FIFO_ERR BIT(2)
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#define HISI_I2C_INT_RX_FULL BIT(3)
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#define HISI_I2C_INT_TX_EMPTY BIT(4)
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#define HISI_I2C_INT_ERR \
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(HISI_I2C_INT_TRANS_ERR | HISI_I2C_INT_FIFO_ERR)
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#define HISI_I2C_STD_SPEED_MODE 0
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#define HISI_I2C_FAST_SPEED_MODE 1
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#define HISI_I2C_HIGH_SPEED_MODE 2
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#define HISI_I2C_TX_FIFO_DEPTH 64
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#define HISI_I2C_RX_FIFO_DEPTH 64
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#define HISI_I2C_TX_F_AE_THRESH 1
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#define HISI_I2C_RX_F_AF_THRESH 60
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#define NSEC_TO_CYCLES(ns, clk_rate_khz) \
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DIV_ROUND_UP_ULL((clk_rate_khz) * (ns), NSEC_PER_MSEC)
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struct hisi_i2c_controller {
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struct i2c_adapter adapter;
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void __iomem *iobase;
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struct device *dev;
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int irq;
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/* Intermediates for recording the transfer process */
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struct completion *completion;
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struct i2c_msg *msgs;
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int msg_num;
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int msg_tx_idx;
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int buf_tx_idx;
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int msg_rx_idx;
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int buf_rx_idx;
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u16 tar_addr;
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u32 xfer_err;
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/* I2C bus configuration */
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struct i2c_timings t;
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u32 clk_rate_khz;
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u32 spk_len;
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};
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static void hisi_i2c_enable_int(struct hisi_i2c_controller *ctlr, u32 mask)
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{
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writel_relaxed(mask, ctlr->iobase + HISI_I2C_INT_MASK);
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}
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static void hisi_i2c_disable_int(struct hisi_i2c_controller *ctlr, u32 mask)
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{
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writel_relaxed((~mask) & HISI_I2C_INT_ALL, ctlr->iobase + HISI_I2C_INT_MASK);
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}
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static void hisi_i2c_clear_int(struct hisi_i2c_controller *ctlr, u32 mask)
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{
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writel_relaxed(mask, ctlr->iobase + HISI_I2C_INT_CLR);
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}
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static void hisi_i2c_handle_errors(struct hisi_i2c_controller *ctlr)
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{
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u32 int_err = ctlr->xfer_err, reg;
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if (int_err & HISI_I2C_INT_FIFO_ERR) {
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reg = readl(ctlr->iobase + HISI_I2C_FIFO_STATE);
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if (reg & HISI_I2C_FIFO_STATE_RX_RERR)
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dev_err(ctlr->dev, "rx fifo error read\n");
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if (reg & HISI_I2C_FIFO_STATE_RX_WERR)
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dev_err(ctlr->dev, "rx fifo error write\n");
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if (reg & HISI_I2C_FIFO_STATE_TX_RERR)
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dev_err(ctlr->dev, "tx fifo error read\n");
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if (reg & HISI_I2C_FIFO_STATE_TX_WERR)
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dev_err(ctlr->dev, "tx fifo error write\n");
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}
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}
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static int hisi_i2c_start_xfer(struct hisi_i2c_controller *ctlr)
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{
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struct i2c_msg *msg = ctlr->msgs;
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u32 reg;
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reg = readl(ctlr->iobase + HISI_I2C_FRAME_CTRL);
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reg &= ~HISI_I2C_FRAME_CTRL_ADDR_TEN;
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if (msg->flags & I2C_M_TEN)
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reg |= HISI_I2C_FRAME_CTRL_ADDR_TEN;
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writel(reg, ctlr->iobase + HISI_I2C_FRAME_CTRL);
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reg = readl(ctlr->iobase + HISI_I2C_SLV_ADDR);
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reg &= ~HISI_I2C_SLV_ADDR_VAL;
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reg |= FIELD_PREP(HISI_I2C_SLV_ADDR_VAL, msg->addr);
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writel(reg, ctlr->iobase + HISI_I2C_SLV_ADDR);
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reg = readl(ctlr->iobase + HISI_I2C_FIFO_CTRL);
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reg |= HISI_I2C_FIFO_RX_CLR | HISI_I2C_FIFO_TX_CLR;
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writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL);
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reg &= ~(HISI_I2C_FIFO_RX_CLR | HISI_I2C_FIFO_TX_CLR);
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writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL);
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hisi_i2c_clear_int(ctlr, HISI_I2C_INT_ALL);
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hisi_i2c_enable_int(ctlr, HISI_I2C_INT_ALL);
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return 0;
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}
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static void hisi_i2c_reset_xfer(struct hisi_i2c_controller *ctlr)
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{
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ctlr->msg_num = 0;
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ctlr->xfer_err = 0;
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ctlr->msg_tx_idx = 0;
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ctlr->msg_rx_idx = 0;
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ctlr->buf_tx_idx = 0;
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ctlr->buf_rx_idx = 0;
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}
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/*
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* Initialize the transfer information and start the I2C bus transfer.
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* We only configure the transfer and do some pre/post works here, and
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* wait for the transfer done. The major transfer process is performed
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* in the IRQ handler.
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*/
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static int hisi_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
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int num)
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{
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struct hisi_i2c_controller *ctlr = i2c_get_adapdata(adap);
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DECLARE_COMPLETION_ONSTACK(done);
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int ret = num;
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hisi_i2c_reset_xfer(ctlr);
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ctlr->completion = &done;
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ctlr->msg_num = num;
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ctlr->msgs = msgs;
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hisi_i2c_start_xfer(ctlr);
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if (!wait_for_completion_timeout(ctlr->completion, adap->timeout)) {
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hisi_i2c_disable_int(ctlr, HISI_I2C_INT_ALL);
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synchronize_irq(ctlr->irq);
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i2c_recover_bus(&ctlr->adapter);
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dev_err(ctlr->dev, "bus transfer timeout\n");
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ret = -EIO;
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}
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if (ctlr->xfer_err) {
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hisi_i2c_handle_errors(ctlr);
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ret = -EIO;
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}
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hisi_i2c_reset_xfer(ctlr);
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ctlr->completion = NULL;
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return ret;
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}
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static u32 hisi_i2c_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm hisi_i2c_algo = {
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.master_xfer = hisi_i2c_master_xfer,
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.functionality = hisi_i2c_functionality,
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};
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static int hisi_i2c_read_rx_fifo(struct hisi_i2c_controller *ctlr)
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{
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struct i2c_msg *cur_msg;
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u32 fifo_state;
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while (ctlr->msg_rx_idx < ctlr->msg_num) {
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cur_msg = ctlr->msgs + ctlr->msg_rx_idx;
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if (!(cur_msg->flags & I2C_M_RD)) {
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ctlr->msg_rx_idx++;
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continue;
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}
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fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE);
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while (!(fifo_state & HISI_I2C_FIFO_STATE_RX_EMPTY) &&
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ctlr->buf_rx_idx < cur_msg->len) {
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cur_msg->buf[ctlr->buf_rx_idx++] = readl(ctlr->iobase + HISI_I2C_RXDATA);
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fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE);
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}
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if (ctlr->buf_rx_idx == cur_msg->len) {
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ctlr->buf_rx_idx = 0;
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ctlr->msg_rx_idx++;
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}
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if (fifo_state & HISI_I2C_FIFO_STATE_RX_EMPTY)
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break;
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}
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return 0;
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}
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static void hisi_i2c_xfer_msg(struct hisi_i2c_controller *ctlr)
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{
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int max_write = HISI_I2C_TX_FIFO_DEPTH;
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bool need_restart = false, last_msg;
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struct i2c_msg *cur_msg;
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u32 cmd, fifo_state;
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while (ctlr->msg_tx_idx < ctlr->msg_num) {
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cur_msg = ctlr->msgs + ctlr->msg_tx_idx;
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last_msg = (ctlr->msg_tx_idx == ctlr->msg_num - 1);
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/* Signal the SR bit when we start transferring a new message */
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if (ctlr->msg_tx_idx && !ctlr->buf_tx_idx)
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need_restart = true;
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fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE);
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while (!(fifo_state & HISI_I2C_FIFO_STATE_TX_FULL) &&
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ctlr->buf_tx_idx < cur_msg->len && max_write) {
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cmd = 0;
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if (need_restart) {
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cmd |= HISI_I2C_CMD_TXDATA_SR_EN;
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need_restart = false;
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}
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/* Signal the STOP bit at the last frame of the last message */
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if (ctlr->buf_tx_idx == cur_msg->len - 1 && last_msg)
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cmd |= HISI_I2C_CMD_TXDATA_P_EN;
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if (cur_msg->flags & I2C_M_RD)
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cmd |= HISI_I2C_CMD_TXDATA_RW;
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else
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cmd |= FIELD_PREP(HISI_I2C_CMD_TXDATA_DATA,
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cur_msg->buf[ctlr->buf_tx_idx]);
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writel(cmd, ctlr->iobase + HISI_I2C_CMD_TXDATA);
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ctlr->buf_tx_idx++;
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max_write--;
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fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE);
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}
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/* Update the transfer index after per message transfer is done. */
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if (ctlr->buf_tx_idx == cur_msg->len) {
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ctlr->buf_tx_idx = 0;
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ctlr->msg_tx_idx++;
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}
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if ((fifo_state & HISI_I2C_FIFO_STATE_TX_FULL) ||
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max_write == 0)
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break;
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}
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/*
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* Disable the TX_EMPTY interrupt after finishing all the messages to
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* avoid overwhelming the CPU.
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*/
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if (ctlr->msg_tx_idx == ctlr->msg_num)
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hisi_i2c_disable_int(ctlr, HISI_I2C_INT_TX_EMPTY);
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}
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static irqreturn_t hisi_i2c_irq(int irq, void *context)
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{
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struct hisi_i2c_controller *ctlr = context;
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u32 int_stat;
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/*
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* Don't handle the interrupt if cltr->completion is NULL. We may
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* reach here because the interrupt is spurious or the transfer is
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* started by another port (e.g. firmware) rather than us.
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*/
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if (!ctlr->completion)
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return IRQ_NONE;
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int_stat = readl(ctlr->iobase + HISI_I2C_INT_MSTAT);
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hisi_i2c_clear_int(ctlr, int_stat);
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if (!(int_stat & HISI_I2C_INT_ALL))
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return IRQ_NONE;
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if (int_stat & HISI_I2C_INT_TX_EMPTY)
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hisi_i2c_xfer_msg(ctlr);
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if (int_stat & HISI_I2C_INT_ERR) {
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ctlr->xfer_err = int_stat;
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goto out;
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}
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/* Drain the rx fifo before finish the transfer */
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if (int_stat & (HISI_I2C_INT_TRANS_CPLT | HISI_I2C_INT_RX_FULL))
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hisi_i2c_read_rx_fifo(ctlr);
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out:
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/*
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* Only use TRANS_CPLT to indicate the completion. On error cases we'll
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* get two interrupts, INT_ERR first then TRANS_CPLT.
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*/
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if (int_stat & HISI_I2C_INT_TRANS_CPLT) {
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hisi_i2c_disable_int(ctlr, HISI_I2C_INT_ALL);
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hisi_i2c_clear_int(ctlr, HISI_I2C_INT_ALL);
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complete(ctlr->completion);
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}
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return IRQ_HANDLED;
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}
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/*
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* Helper function for calculating and configuring the HIGH and LOW
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* periods of SCL clock. The caller will pass the ratio of the
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* counts (divide / divisor) according to the target speed mode,
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* and the target registers.
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*/
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static void hisi_i2c_set_scl(struct hisi_i2c_controller *ctlr,
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u32 divide, u32 divisor,
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u32 reg_hcnt, u32 reg_lcnt)
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{
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u32 total_cnt, t_scl_hcnt, t_scl_lcnt, scl_fall_cnt, scl_rise_cnt;
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u32 scl_hcnt, scl_lcnt;
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/* Total SCL clock cycles per speed period */
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total_cnt = DIV_ROUND_UP_ULL(ctlr->clk_rate_khz * HZ_PER_KHZ, ctlr->t.bus_freq_hz);
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/* Total HIGH level SCL clock cycles including edges */
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t_scl_hcnt = DIV_ROUND_UP_ULL(total_cnt * divide, divisor);
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/* Total LOW level SCL clock cycles including edges */
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t_scl_lcnt = total_cnt - t_scl_hcnt;
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/* Fall edge SCL clock cycles */
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scl_fall_cnt = NSEC_TO_CYCLES(ctlr->t.scl_fall_ns, ctlr->clk_rate_khz);
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/* Rise edge SCL clock cycles */
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scl_rise_cnt = NSEC_TO_CYCLES(ctlr->t.scl_rise_ns, ctlr->clk_rate_khz);
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/* Calculated HIGH and LOW periods of SCL clock */
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scl_hcnt = t_scl_hcnt - ctlr->spk_len - 7 - scl_fall_cnt;
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scl_lcnt = t_scl_lcnt - 1 - scl_rise_cnt;
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writel(scl_hcnt, ctlr->iobase + reg_hcnt);
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writel(scl_lcnt, ctlr->iobase + reg_lcnt);
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}
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static void hisi_i2c_configure_bus(struct hisi_i2c_controller *ctlr)
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{
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u32 reg, sda_hold_cnt, speed_mode;
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i2c_parse_fw_timings(ctlr->dev, &ctlr->t, true);
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ctlr->spk_len = NSEC_TO_CYCLES(ctlr->t.digital_filter_width_ns, ctlr->clk_rate_khz);
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switch (ctlr->t.bus_freq_hz) {
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case I2C_MAX_FAST_MODE_FREQ:
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speed_mode = HISI_I2C_FAST_SPEED_MODE;
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hisi_i2c_set_scl(ctlr, 26, 76, HISI_I2C_FS_SCL_HCNT, HISI_I2C_FS_SCL_LCNT);
|
|
break;
|
|
case I2C_MAX_HIGH_SPEED_MODE_FREQ:
|
|
speed_mode = HISI_I2C_HIGH_SPEED_MODE;
|
|
hisi_i2c_set_scl(ctlr, 6, 22, HISI_I2C_HS_SCL_HCNT, HISI_I2C_HS_SCL_LCNT);
|
|
break;
|
|
case I2C_MAX_STANDARD_MODE_FREQ:
|
|
default:
|
|
speed_mode = HISI_I2C_STD_SPEED_MODE;
|
|
|
|
/* For default condition force the bus speed to standard mode. */
|
|
ctlr->t.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
|
|
hisi_i2c_set_scl(ctlr, 40, 87, HISI_I2C_SS_SCL_HCNT, HISI_I2C_SS_SCL_LCNT);
|
|
break;
|
|
}
|
|
|
|
reg = readl(ctlr->iobase + HISI_I2C_FRAME_CTRL);
|
|
reg &= ~HISI_I2C_FRAME_CTRL_SPEED_MODE;
|
|
reg |= FIELD_PREP(HISI_I2C_FRAME_CTRL_SPEED_MODE, speed_mode);
|
|
writel(reg, ctlr->iobase + HISI_I2C_FRAME_CTRL);
|
|
|
|
sda_hold_cnt = NSEC_TO_CYCLES(ctlr->t.sda_hold_ns, ctlr->clk_rate_khz);
|
|
|
|
reg = FIELD_PREP(HISI_I2C_SDA_HOLD_TX, sda_hold_cnt);
|
|
writel(reg, ctlr->iobase + HISI_I2C_SDA_HOLD);
|
|
|
|
writel(ctlr->spk_len, ctlr->iobase + HISI_I2C_FS_SPK_LEN);
|
|
|
|
reg = FIELD_PREP(HISI_I2C_FIFO_RX_AF_THRESH, HISI_I2C_RX_F_AF_THRESH);
|
|
reg |= FIELD_PREP(HISI_I2C_FIFO_TX_AE_THRESH, HISI_I2C_TX_F_AE_THRESH);
|
|
writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL);
|
|
}
|
|
|
|
static int hisi_i2c_probe(struct platform_device *pdev)
|
|
{
|
|
struct hisi_i2c_controller *ctlr;
|
|
struct device *dev = &pdev->dev;
|
|
struct i2c_adapter *adapter;
|
|
u64 clk_rate_hz;
|
|
u32 hw_version;
|
|
int ret;
|
|
|
|
ctlr = devm_kzalloc(dev, sizeof(*ctlr), GFP_KERNEL);
|
|
if (!ctlr)
|
|
return -ENOMEM;
|
|
|
|
ctlr->iobase = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(ctlr->iobase))
|
|
return PTR_ERR(ctlr->iobase);
|
|
|
|
ctlr->irq = platform_get_irq(pdev, 0);
|
|
if (ctlr->irq < 0)
|
|
return ctlr->irq;
|
|
|
|
ctlr->dev = dev;
|
|
|
|
hisi_i2c_disable_int(ctlr, HISI_I2C_INT_ALL);
|
|
|
|
ret = devm_request_irq(dev, ctlr->irq, hisi_i2c_irq, 0, "hisi-i2c", ctlr);
|
|
if (ret) {
|
|
dev_err(dev, "failed to request irq handler, ret = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = device_property_read_u64(dev, "clk_rate", &clk_rate_hz);
|
|
if (ret) {
|
|
dev_err(dev, "failed to get clock frequency, ret = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ctlr->clk_rate_khz = DIV_ROUND_UP_ULL(clk_rate_hz, HZ_PER_KHZ);
|
|
|
|
hisi_i2c_configure_bus(ctlr);
|
|
|
|
adapter = &ctlr->adapter;
|
|
snprintf(adapter->name, sizeof(adapter->name),
|
|
"HiSilicon I2C Controller %s", dev_name(dev));
|
|
adapter->owner = THIS_MODULE;
|
|
adapter->algo = &hisi_i2c_algo;
|
|
adapter->dev.parent = dev;
|
|
i2c_set_adapdata(adapter, ctlr);
|
|
|
|
ret = devm_i2c_add_adapter(dev, adapter);
|
|
if (ret)
|
|
return ret;
|
|
|
|
hw_version = readl(ctlr->iobase + HISI_I2C_VERSION);
|
|
dev_info(ctlr->dev, "speed mode is %s. hw version 0x%x\n",
|
|
i2c_freq_mode_string(ctlr->t.bus_freq_hz), hw_version);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct acpi_device_id hisi_i2c_acpi_ids[] = {
|
|
{ "HISI03D1", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, hisi_i2c_acpi_ids);
|
|
|
|
static struct platform_driver hisi_i2c_driver = {
|
|
.probe = hisi_i2c_probe,
|
|
.driver = {
|
|
.name = "hisi-i2c",
|
|
.acpi_match_table = hisi_i2c_acpi_ids,
|
|
},
|
|
};
|
|
module_platform_driver(hisi_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Yicong Yang <yangyicong@hisilicon.com>");
|
|
MODULE_DESCRIPTION("HiSilicon I2C Controller Driver");
|
|
MODULE_LICENSE("GPL");
|