From: Yicong Yang yangyicong@hisilicon.com

mainline inclusion from mainline-v5.13-rc1 commit d62fbdb99a85730af408399bfae9fa2aa708c6f1 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I42E7E CVE: NA

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Add HiSilicon I2C controller driver for the Kunpeng SoC. It provides the access to the i2c busses, which connects to the eeprom, rtc, etc.

The driver works with IRQ mode, and supports basic I2C features and 10bit address. The DMA is not supported.

Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Reviewed-by: Dmitry Osipenko digetx@gmail.com Signed-off-by: Yicong Yang yangyicong@hisilicon.com Signed-off-by: Wolfram Sang wsa@kernel.org Conflicts: MAINTAINERS Signed-off-by: Jiaran Zhang zhangjiaran@huawei.com Reviewed-by: Sheng Feng < fengsheng5@huawei.com> Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- MAINTAINERS | 7 + drivers/i2c/busses/Kconfig | 10 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-hisi.c | 509 ++++++++++++++++++++++++++++++++++ 4 files changed, 527 insertions(+) create mode 100644 drivers/i2c/busses/i2c-hisi.c

diff --git a/MAINTAINERS b/MAINTAINERS index 8295c20fdcbf2..6634d287526c5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6658,6 +6658,13 @@ F: drivers/net/ethernet/hisilicon/hns3/hns-customer/ F: drivers/net/ethernet/hisilicon/hns3/hns3_cae/ F: drivers/net/ethernet/hisilicon/hns3/Makefile

+HISILICON I2C CONTROLLER DRIVER +M: Yicong Yang yangyicong@hisilicon.com +L: linux-i2c@vger.kernel.org +S: Maintained +W: https://www.hisilicon.com +F: drivers/i2c/busses/i2c-hisi.c + HISILICON LPC BUS DRIVER M: john.garry@huawei.com W: http://www.hisilicon.com diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 7ad6c3ce782e5..e808d3c7ec384 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -606,6 +606,16 @@ config I2C_HIGHLANDER This driver can also be built as a module. If so, the module will be called i2c-highlander.

+config I2C_HISI + tristate "HiSilicon I2C controller" + depends on ARM64 || COMPILE_TEST + help + Say Y here if you want to have Hisilicon I2C controller support + available on the Kunpeng Server. + + This driver can also be built as a module. If so, the module + will be called i2c-hisi. + config I2C_IBM_IIC tristate "IBM PPC 4xx on-chip I2C interface" depends on 4xx diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 18b26af82b1c5..550b76d5b0296 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -59,6 +59,7 @@ obj-$(CONFIG_I2C_EMEV2) += i2c-emev2.o obj-$(CONFIG_I2C_EXYNOS5) += i2c-exynos5.o obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o +obj-$(CONFIG_I2C_HISI) += i2c-hisi.o obj-$(CONFIG_I2C_HIX5HD2) += i2c-hix5hd2.o obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o obj-$(CONFIG_I2C_IMG) += i2c-img-scb.o diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c new file mode 100644 index 0000000000000..5f17fe52feea4 --- /dev/null +++ b/drivers/i2c/busses/i2c-hisi.c @@ -0,0 +1,509 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * HiSilicon I2C Controller Driver for Kunpeng SoC + * + * Copyright (c) 2021 HiSilicon Technologies Co., Ltd. + */ + +#include <linux/bits.h> +#include <linux/bitfield.h> +#include <linux/completion.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> +#include <linux/property.h> + +#define HISI_I2C_FRAME_CTRL 0x0000 +#define HISI_I2C_FRAME_CTRL_SPEED_MODE GENMASK(1, 0) +#define HISI_I2C_FRAME_CTRL_ADDR_TEN BIT(2) +#define HISI_I2C_SLV_ADDR 0x0004 +#define HISI_I2C_SLV_ADDR_VAL GENMASK(9, 0) +#define HISI_I2C_SLV_ADDR_GC_S_MODE BIT(10) +#define HISI_I2C_SLV_ADDR_GC_S_EN BIT(11) +#define HISI_I2C_CMD_TXDATA 0x0008 +#define HISI_I2C_CMD_TXDATA_DATA GENMASK(7, 0) +#define HISI_I2C_CMD_TXDATA_RW BIT(8) +#define HISI_I2C_CMD_TXDATA_P_EN BIT(9) +#define HISI_I2C_CMD_TXDATA_SR_EN BIT(10) +#define HISI_I2C_RXDATA 0x000c +#define HISI_I2C_RXDATA_DATA GENMASK(7, 0) +#define HISI_I2C_SS_SCL_HCNT 0x0010 +#define HISI_I2C_SS_SCL_LCNT 0x0014 +#define HISI_I2C_FS_SCL_HCNT 0x0018 +#define HISI_I2C_FS_SCL_LCNT 0x001c +#define HISI_I2C_HS_SCL_HCNT 0x0020 +#define HISI_I2C_HS_SCL_LCNT 0x0024 +#define HISI_I2C_FIFO_CTRL 0x0028 +#define HISI_I2C_FIFO_RX_CLR BIT(0) +#define HISI_I2C_FIFO_TX_CLR BIT(1) +#define HISI_I2C_FIFO_RX_AF_THRESH GENMASK(7, 2) +#define HISI_I2C_FIFO_TX_AE_THRESH GENMASK(13, 8) +#define HISI_I2C_FIFO_STATE 0x002c +#define HISI_I2C_FIFO_STATE_RX_RERR BIT(0) +#define HISI_I2C_FIFO_STATE_RX_WERR BIT(1) +#define HISI_I2C_FIFO_STATE_RX_EMPTY BIT(3) +#define HISI_I2C_FIFO_STATE_TX_RERR BIT(6) +#define HISI_I2C_FIFO_STATE_TX_WERR BIT(7) +#define HISI_I2C_FIFO_STATE_TX_FULL BIT(11) +#define HISI_I2C_SDA_HOLD 0x0030 +#define HISI_I2C_SDA_HOLD_TX GENMASK(15, 0) +#define HISI_I2C_SDA_HOLD_RX GENMASK(23, 16) +#define HISI_I2C_FS_SPK_LEN 0x0038 +#define HISI_I2C_FS_SPK_LEN_CNT GENMASK(7, 0) +#define HISI_I2C_HS_SPK_LEN 0x003c +#define HISI_I2C_HS_SPK_LEN_CNT GENMASK(7, 0) +#define HISI_I2C_INT_MSTAT 0x0044 +#define HISI_I2C_INT_CLR 0x0048 +#define HISI_I2C_INT_MASK 0x004C +#define HISI_I2C_TRANS_STATE 0x0050 +#define HISI_I2C_TRANS_ERR 0x0054 +#define HISI_I2C_VERSION 0x0058 + +#define HISI_I2C_INT_ALL GENMASK(4, 0) +#define HISI_I2C_INT_TRANS_CPLT BIT(0) +#define HISI_I2C_INT_TRANS_ERR BIT(1) +#define HISI_I2C_INT_FIFO_ERR BIT(2) +#define HISI_I2C_INT_RX_FULL BIT(3) +#define HISI_I2C_INT_TX_EMPTY BIT(4) +#define HISI_I2C_INT_ERR \ + (HISI_I2C_INT_TRANS_ERR | HISI_I2C_INT_FIFO_ERR) + +#define HISI_I2C_STD_SPEED_MODE 0 +#define HISI_I2C_FAST_SPEED_MODE 1 +#define HISI_I2C_HIGH_SPEED_MODE 2 + +#define HISI_I2C_TX_FIFO_DEPTH 64 +#define HISI_I2C_RX_FIFO_DEPTH 64 +#define HISI_I2C_TX_F_AE_THRESH 1 +#define HISI_I2C_RX_F_AF_THRESH 60 + +#define HZ_PER_KHZ 1000 + +#define NSEC_TO_CYCLES(ns, clk_rate_khz) \ + DIV_ROUND_UP_ULL((clk_rate_khz) * (ns), NSEC_PER_MSEC) + +struct hisi_i2c_controller { + struct i2c_adapter adapter; + void __iomem *iobase; + struct device *dev; + int irq; + + /* Intermediates for recording the transfer process */ + struct completion *completion; + struct i2c_msg *msgs; + int msg_num; + int msg_tx_idx; + int buf_tx_idx; + int msg_rx_idx; + int buf_rx_idx; + u16 tar_addr; + u32 xfer_err; + + /* I2C bus configuration */ + struct i2c_timings t; + u32 clk_rate_khz; + u32 spk_len; +}; + +static void hisi_i2c_enable_int(struct hisi_i2c_controller *ctlr, u32 mask) +{ + writel_relaxed(mask, ctlr->iobase + HISI_I2C_INT_MASK); +} + +static void hisi_i2c_disable_int(struct hisi_i2c_controller *ctlr, u32 mask) +{ + writel_relaxed((~mask) & HISI_I2C_INT_ALL, ctlr->iobase + HISI_I2C_INT_MASK); +} + +static void hisi_i2c_clear_int(struct hisi_i2c_controller *ctlr, u32 mask) +{ + writel_relaxed(mask, ctlr->iobase + HISI_I2C_INT_CLR); +} + +static void hisi_i2c_handle_errors(struct hisi_i2c_controller *ctlr) +{ + u32 int_err = ctlr->xfer_err, reg; + + if (int_err & HISI_I2C_INT_FIFO_ERR) { + reg = readl(ctlr->iobase + HISI_I2C_FIFO_STATE); + + if (reg & HISI_I2C_FIFO_STATE_RX_RERR) + dev_err(ctlr->dev, "rx fifo error read\n"); + + if (reg & HISI_I2C_FIFO_STATE_RX_WERR) + dev_err(ctlr->dev, "rx fifo error write\n"); + + if (reg & HISI_I2C_FIFO_STATE_TX_RERR) + dev_err(ctlr->dev, "tx fifo error read\n"); + + if (reg & HISI_I2C_FIFO_STATE_TX_WERR) + dev_err(ctlr->dev, "tx fifo error write\n"); + } +} + +static int hisi_i2c_start_xfer(struct hisi_i2c_controller *ctlr) +{ + struct i2c_msg *msg = ctlr->msgs; + u32 reg; + + reg = readl(ctlr->iobase + HISI_I2C_FRAME_CTRL); + reg &= ~HISI_I2C_FRAME_CTRL_ADDR_TEN; + if (msg->flags & I2C_M_TEN) + reg |= HISI_I2C_FRAME_CTRL_ADDR_TEN; + writel(reg, ctlr->iobase + HISI_I2C_FRAME_CTRL); + + reg = readl(ctlr->iobase + HISI_I2C_SLV_ADDR); + reg &= ~HISI_I2C_SLV_ADDR_VAL; + reg |= FIELD_PREP(HISI_I2C_SLV_ADDR_VAL, msg->addr); + writel(reg, ctlr->iobase + HISI_I2C_SLV_ADDR); + + reg = readl(ctlr->iobase + HISI_I2C_FIFO_CTRL); + reg |= HISI_I2C_FIFO_RX_CLR | HISI_I2C_FIFO_TX_CLR; + writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL); + reg &= ~(HISI_I2C_FIFO_RX_CLR | HISI_I2C_FIFO_TX_CLR); + writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL); + + hisi_i2c_clear_int(ctlr, HISI_I2C_INT_ALL); + hisi_i2c_enable_int(ctlr, HISI_I2C_INT_ALL); + + return 0; +} + +static void hisi_i2c_reset_xfer(struct hisi_i2c_controller *ctlr) +{ + ctlr->msg_num = 0; + ctlr->xfer_err = 0; + ctlr->msg_tx_idx = 0; + ctlr->msg_rx_idx = 0; + ctlr->buf_tx_idx = 0; + ctlr->buf_rx_idx = 0; +} + +/* + * Initialize the transfer information and start the I2C bus transfer. + * We only configure the transfer and do some pre/post works here, and + * wait for the transfer done. The major transfer process is performed + * in the IRQ handler. + */ +static int hisi_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, + int num) +{ + struct hisi_i2c_controller *ctlr = i2c_get_adapdata(adap); + DECLARE_COMPLETION_ONSTACK(done); + int ret = num; + + hisi_i2c_reset_xfer(ctlr); + ctlr->completion = &done; + ctlr->msg_num = num; + ctlr->msgs = msgs; + + hisi_i2c_start_xfer(ctlr); + + if (!wait_for_completion_timeout(ctlr->completion, adap->timeout)) { + hisi_i2c_disable_int(ctlr, HISI_I2C_INT_ALL); + synchronize_irq(ctlr->irq); + i2c_recover_bus(&ctlr->adapter); + dev_err(ctlr->dev, "bus transfer timeout\n"); + ret = -EIO; + } + + if (ctlr->xfer_err) { + hisi_i2c_handle_errors(ctlr); + ret = -EIO; + } + + hisi_i2c_reset_xfer(ctlr); + ctlr->completion = NULL; + + return ret; +} + +static u32 hisi_i2c_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm hisi_i2c_algo = { + .master_xfer = hisi_i2c_master_xfer, + .functionality = hisi_i2c_functionality, +}; + +static int hisi_i2c_read_rx_fifo(struct hisi_i2c_controller *ctlr) +{ + struct i2c_msg *cur_msg; + u32 fifo_state; + + while (ctlr->msg_rx_idx < ctlr->msg_num) { + cur_msg = ctlr->msgs + ctlr->msg_rx_idx; + + if (!(cur_msg->flags & I2C_M_RD)) { + ctlr->msg_rx_idx++; + continue; + } + + fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE); + while (!(fifo_state & HISI_I2C_FIFO_STATE_RX_EMPTY) && + ctlr->buf_rx_idx < cur_msg->len) { + cur_msg->buf[ctlr->buf_rx_idx++] = readl(ctlr->iobase + HISI_I2C_RXDATA); + fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE); + } + + if (ctlr->buf_rx_idx == cur_msg->len) { + ctlr->buf_rx_idx = 0; + ctlr->msg_rx_idx++; + } + + if (fifo_state & HISI_I2C_FIFO_STATE_RX_EMPTY) + break; + } + + return 0; +} + +static void hisi_i2c_xfer_msg(struct hisi_i2c_controller *ctlr) +{ + int max_write = HISI_I2C_TX_FIFO_DEPTH; + bool need_restart = false, last_msg; + struct i2c_msg *cur_msg; + u32 cmd, fifo_state; + + while (ctlr->msg_tx_idx < ctlr->msg_num) { + cur_msg = ctlr->msgs + ctlr->msg_tx_idx; + last_msg = (ctlr->msg_tx_idx == ctlr->msg_num - 1); + + /* Signal the SR bit when we start transferring a new message */ + if (ctlr->msg_tx_idx && !ctlr->buf_tx_idx) + need_restart = true; + + fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE); + while (!(fifo_state & HISI_I2C_FIFO_STATE_TX_FULL) && + ctlr->buf_tx_idx < cur_msg->len && max_write) { + cmd = 0; + + if (need_restart) { + cmd |= HISI_I2C_CMD_TXDATA_SR_EN; + need_restart = false; + } + + /* Signal the STOP bit at the last frame of the last message */ + if (ctlr->buf_tx_idx == cur_msg->len - 1 && last_msg) + cmd |= HISI_I2C_CMD_TXDATA_P_EN; + + if (cur_msg->flags & I2C_M_RD) + cmd |= HISI_I2C_CMD_TXDATA_RW; + else + cmd |= FIELD_PREP(HISI_I2C_CMD_TXDATA_DATA, + cur_msg->buf[ctlr->buf_tx_idx]); + + writel(cmd, ctlr->iobase + HISI_I2C_CMD_TXDATA); + ctlr->buf_tx_idx++; + max_write--; + + fifo_state = readl(ctlr->iobase + HISI_I2C_FIFO_STATE); + } + + /* Update the transfer index after per message transfer is done. */ + if (ctlr->buf_tx_idx == cur_msg->len) { + ctlr->buf_tx_idx = 0; + ctlr->msg_tx_idx++; + } + + if ((fifo_state & HISI_I2C_FIFO_STATE_TX_FULL) || + max_write == 0) + break; + } +} + +static irqreturn_t hisi_i2c_irq(int irq, void *context) +{ + struct hisi_i2c_controller *ctlr = context; + u32 int_stat; + + int_stat = readl(ctlr->iobase + HISI_I2C_INT_MSTAT); + hisi_i2c_clear_int(ctlr, int_stat); + if (!(int_stat & HISI_I2C_INT_ALL)) + return IRQ_NONE; + + if (int_stat & HISI_I2C_INT_TX_EMPTY) + hisi_i2c_xfer_msg(ctlr); + + if (int_stat & HISI_I2C_INT_ERR) { + ctlr->xfer_err = int_stat; + goto out; + } + + /* Drain the rx fifo before finish the transfer */ + if (int_stat & (HISI_I2C_INT_TRANS_CPLT | HISI_I2C_INT_RX_FULL)) + hisi_i2c_read_rx_fifo(ctlr); + +out: + if (int_stat & HISI_I2C_INT_TRANS_CPLT || ctlr->xfer_err) { + hisi_i2c_disable_int(ctlr, HISI_I2C_INT_ALL); + hisi_i2c_clear_int(ctlr, HISI_I2C_INT_ALL); + complete(ctlr->completion); + } + + return IRQ_HANDLED; +} + +/* + * Helper function for calculating and configuring the HIGH and LOW + * periods of SCL clock. The caller will pass the ratio of the + * counts (divide / divisor) according to the target speed mode, + * and the target registers. + */ +static void hisi_i2c_set_scl(struct hisi_i2c_controller *ctlr, + u32 divide, u32 divisor, + u32 reg_hcnt, u32 reg_lcnt) +{ + u32 total_cnt, t_scl_hcnt, t_scl_lcnt, scl_fall_cnt, scl_rise_cnt; + u32 scl_hcnt, scl_lcnt; + + /* Total SCL clock cycles per speed period */ + total_cnt = DIV_ROUND_UP_ULL(ctlr->clk_rate_khz * HZ_PER_KHZ, ctlr->t.bus_freq_hz); + /* Total HIGH level SCL clock cycles including edges */ + t_scl_hcnt = DIV_ROUND_UP_ULL(total_cnt * divide, divisor); + /* Total LOW level SCL clock cycles including edges */ + t_scl_lcnt = total_cnt - t_scl_hcnt; + /* Fall edge SCL clock cycles */ + scl_fall_cnt = NSEC_TO_CYCLES(ctlr->t.scl_fall_ns, ctlr->clk_rate_khz); + /* Rise edge SCL clock cycles */ + scl_rise_cnt = NSEC_TO_CYCLES(ctlr->t.scl_rise_ns, ctlr->clk_rate_khz); + + /* Calculated HIGH and LOW periods of SCL clock */ + scl_hcnt = t_scl_hcnt - ctlr->spk_len - 7 - scl_fall_cnt; + scl_lcnt = t_scl_lcnt - 1 - scl_rise_cnt; + + writel(scl_hcnt, ctlr->iobase + reg_hcnt); + writel(scl_lcnt, ctlr->iobase + reg_lcnt); +} + +static void hisi_i2c_configure_bus(struct hisi_i2c_controller *ctlr) +{ + u32 reg, sda_hold_cnt, speed_mode, digital_filter_width_ns; + + i2c_parse_fw_timings(ctlr->dev, &ctlr->t, true); + device_property_read_u32(ctlr->dev, "i2c-digital-filter-width-ns", + &digital_filter_width_ns); + ctlr->spk_len = NSEC_TO_CYCLES(digital_filter_width_ns, + ctlr->clk_rate_khz); + + switch (ctlr->t.bus_freq_hz) { + case I2C_MAX_FAST_MODE_FREQ: + speed_mode = HISI_I2C_FAST_SPEED_MODE; + 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; + struct resource *res; + u64 clk_rate_hz; + u32 hw_version; + int ret; + + ctlr = devm_kzalloc(dev, sizeof(*ctlr), GFP_KERNEL); + if (!ctlr) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ctlr->iobase = devm_ioremap_resource(&pdev->dev, res); + 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");

From: Luo Jiaxing luojiaxing@huawei.com

mainline inclusion from mainline-v5.11-rc1 commit: 356b01a986a5550ee16dd0b85306c6741f2d02d5 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I42E7W CVE: NA

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This GPIO driver is for HiSilicon's ARM SoC.

HiSilicon's GPIO controller support double-edge interrupt and multi-core concurrent access.

ACPI table example for this GPIO controller: Device (GPO0) { Name (_HID, "HiSiliconISI0184") Device (PRTA) enter{ Name (_ADR, Zero) Name (_UID, Zero) Name (_DSD, Package (0x01)your { Package (0x02) { "ngpios", 0x20 } }) } }

Signed-off-by: Luo Jiaxing luojiaxing@huawei.com Link: https://lore.kernel.org/r/1607934255-52544-2-git-send-email-luojiaxing@huawe... Signed-off-by: Linus Walleij linus.walleij@linaro.org Conflicts: drivers/gpio/Makefile Signed-off-by: Jiaran Zhang zhangjiaran@huawei.com Reviewed-by: Sheng Feng < fengsheng5@huawei.com> Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/gpio/Kconfig | 11 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-hisi.c | 368 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 380 insertions(+) create mode 100644 drivers/gpio/gpio-hisi.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 2c34e9537f9e4..90331e682b3bc 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -245,6 +245,17 @@ config GPIO_GRGPIO Select this to support Aeroflex Gaisler GRGPIO cores from the GRLIB VHDL IP core library.

+config GPIO_HISI + tristate "HiSilicon GPIO controller driver" + depends on (ARM64 || COMPILE_TEST) && ACPI + select GPIO_GENERIC + select GPIOLIB_IRQCHIP + help + Say Y or M here to build support for the HiSilicon GPIO controller + driver GPIO block. + This GPIO controller support double-edge interrupt and multi-core + concurrent access. + config GPIO_HLWD tristate "Nintendo Wii (Hollywood) GPIO" depends on OF_GPIO diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index c256aff66a656..e92282d0492c6 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -54,6 +54,7 @@ obj-$(CONFIG_GPIO_FTGPIO010) += gpio-ftgpio010.o obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o obj-$(CONFIG_GPIO_GPIO_MM) += gpio-gpio-mm.o obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o +obj-$(CONFIG_GPIO_HISI) += gpio-hisi.o obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o obj-$(CONFIG_GPIO_ICH) += gpio-ich.o diff --git a/drivers/gpio/gpio-hisi.c b/drivers/gpio/gpio-hisi.c new file mode 100644 index 0000000000000..cb5265fcae95b --- /dev/null +++ b/drivers/gpio/gpio-hisi.c @@ -0,0 +1,368 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2020 HiSilicon Limited. */ +#include <linux/gpio/driver.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> +#include <linux/property.h> + +#define HISI_GPIO_SWPORT_DR_SET_WX 0x000 +#define HISI_GPIO_SWPORT_DR_CLR_WX 0x004 +#define HISI_GPIO_SWPORT_DDR_SET_WX 0x010 +#define HISI_GPIO_SWPORT_DDR_CLR_WX 0x014 +#define HISI_GPIO_SWPORT_DDR_ST_WX 0x018 +#define HISI_GPIO_INTEN_SET_WX 0x020 +#define HISI_GPIO_INTEN_CLR_WX 0x024 +#define HISI_GPIO_INTMASK_SET_WX 0x030 +#define HISI_GPIO_INTMASK_CLR_WX 0x034 +#define HISI_GPIO_INTTYPE_EDGE_SET_WX 0x040 +#define HISI_GPIO_INTTYPE_EDGE_CLR_WX 0x044 +#define HISI_GPIO_INT_POLARITY_SET_WX 0x050 +#define HISI_GPIO_INT_POLARITY_CLR_WX 0x054 +#define HISI_GPIO_DEBOUNCE_SET_WX 0x060 +#define HISI_GPIO_DEBOUNCE_CLR_WX 0x064 +#define HISI_GPIO_INTSTATUS_WX 0x070 +#define HISI_GPIO_PORTA_EOI_WX 0x078 +#define HISI_GPIO_EXT_PORT_WX 0x080 +#define HISI_GPIO_INTCOMB_MASK_WX 0x0a0 +#define HISI_GPIO_INT_DEDGE_SET 0x0b0 +#define HISI_GPIO_INT_DEDGE_CLR 0x0b4 +#define HISI_GPIO_INT_DEDGE_ST 0x0b8 + +#define HISI_GPIO_LINE_NUM_MAX 32 +#define HISI_GPIO_DRIVER_NAME "gpio-hisi" + +struct hisi_gpio { + struct gpio_chip chip; + struct device *dev; + void __iomem *reg_base; + unsigned int line_num; + struct irq_chip irq_chip; + int irq; +}; + +static inline u32 hisi_gpio_read_reg(struct gpio_chip *chip, + unsigned int off) +{ + struct hisi_gpio *hisi_gpio = + container_of(chip, struct hisi_gpio, chip); + void __iomem *reg = hisi_gpio->reg_base + off; + + return readl(reg); +} + +static inline void hisi_gpio_write_reg(struct gpio_chip *chip, + unsigned int off, u32 val) +{ + struct hisi_gpio *hisi_gpio = + container_of(chip, struct hisi_gpio, chip); + void __iomem *reg = hisi_gpio->reg_base + off; + + writel(val, reg); +} + +static void hisi_gpio_set_debounce(struct gpio_chip *chip, unsigned int off, + u32 debounce) +{ + if (debounce) + hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_SET_WX, BIT(off)); + else + hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_CLR_WX, BIT(off)); +} + +static int hisi_gpio_set_config(struct gpio_chip *chip, unsigned int offset, + unsigned long config) +{ + u32 config_para = pinconf_to_config_param(config); + u32 config_arg; + + switch (config_para) { + case PIN_CONFIG_INPUT_DEBOUNCE: + config_arg = pinconf_to_config_argument(config); + hisi_gpio_set_debounce(chip, offset, config_arg); + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static void hisi_gpio_set_ack(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + + hisi_gpio_write_reg(chip, HISI_GPIO_PORTA_EOI_WX, BIT(irqd_to_hwirq(d))); +} + +static void hisi_gpio_irq_set_mask(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + + hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_SET_WX, BIT(irqd_to_hwirq(d))); +} + +static void hisi_gpio_irq_clr_mask(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + + hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_CLR_WX, BIT(irqd_to_hwirq(d))); +} + +static int hisi_gpio_irq_set_type(struct irq_data *d, u32 type) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + unsigned int mask = BIT(irqd_to_hwirq(d)); + + switch (type) { + case IRQ_TYPE_EDGE_BOTH: + hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_SET, mask); + break; + case IRQ_TYPE_EDGE_RISING: + hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask); + hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask); + break; + case IRQ_TYPE_EDGE_FALLING: + hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask); + hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask); + break; + case IRQ_TYPE_LEVEL_HIGH: + hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask); + hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask); + break; + case IRQ_TYPE_LEVEL_LOW: + hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask); + hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask); + break; + default: + return -EINVAL; + } + + /* + * The dual-edge interrupt and other interrupt's registers do not + * take effect at the same time. The registers of the two-edge + * interrupts have higher priorities, the configuration of + * the dual-edge interrupts must be disabled before the configuration + * of other kind of interrupts. + */ + if (type != IRQ_TYPE_EDGE_BOTH) { + unsigned int both = hisi_gpio_read_reg(chip, HISI_GPIO_INT_DEDGE_ST); + + if (both & mask) + hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_CLR, mask); + } + + if (type & IRQ_TYPE_LEVEL_MASK) + irq_set_handler_locked(d, handle_level_irq); + else if (type & IRQ_TYPE_EDGE_BOTH) + irq_set_handler_locked(d, handle_edge_irq); + + return 0; +} + +static void hisi_gpio_irq_enable(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + + hisi_gpio_irq_clr_mask(d); + hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_SET_WX, BIT(irqd_to_hwirq(d))); +} + +static void hisi_gpio_irq_disable(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + + hisi_gpio_irq_set_mask(d); + hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_CLR_WX, BIT(irqd_to_hwirq(d))); +} + +static void hisi_gpio_irq_handler(struct irq_desc *desc) +{ + struct hisi_gpio *hisi_gpio = irq_desc_get_handler_data(desc); + unsigned long irq_msk = hisi_gpio_read_reg(&hisi_gpio->chip, + HISI_GPIO_INTSTATUS_WX); + struct irq_chip *irq_c = irq_desc_get_chip(desc); + int hwirq; + + chained_irq_enter(irq_c, desc); + for_each_set_bit(hwirq, &irq_msk, HISI_GPIO_LINE_NUM_MAX) + generic_handle_irq(irq_find_mapping(hisi_gpio->chip.irq.domain, + hwirq)); + chained_irq_exit(irq_c, desc); +} + +static void hisi_gpio_init_irq(struct hisi_gpio *hisi_gpio) +{ + struct gpio_chip *chip = &hisi_gpio->chip; + struct gpio_irq_chip *girq_chip = &chip->irq; + + /* Set hooks for irq_chip */ + hisi_gpio->irq_chip.irq_ack = hisi_gpio_set_ack; + hisi_gpio->irq_chip.irq_mask = hisi_gpio_irq_set_mask; + hisi_gpio->irq_chip.irq_unmask = hisi_gpio_irq_clr_mask; + hisi_gpio->irq_chip.irq_set_type = hisi_gpio_irq_set_type; + hisi_gpio->irq_chip.irq_enable = hisi_gpio_irq_enable; + hisi_gpio->irq_chip.irq_disable = hisi_gpio_irq_disable; + + girq_chip->chip = &hisi_gpio->irq_chip; + girq_chip->default_type = IRQ_TYPE_NONE; + girq_chip->num_parents = 1; + girq_chip->parents = &hisi_gpio->irq; + girq_chip->parent_handler = hisi_gpio_irq_handler; + girq_chip->parent_handler_data = hisi_gpio; + + /* Clear Mask of GPIO controller combine IRQ */ + hisi_gpio_write_reg(chip, HISI_GPIO_INTCOMB_MASK_WX, 1); +} + +static const struct acpi_device_id hisi_gpio_acpi_match[] = { + {"HISI0184", 0}, + {} +}; +MODULE_DEVICE_TABLE(acpi, hisi_gpio_acpi_match); + +static void hisi_gpio_get_pdata(struct device *dev, + struct hisi_gpio *hisi_gpio) +{ + struct platform_device *pdev = to_platform_device(dev); + struct fwnode_handle *fwnode; + int idx = 0; + + device_for_each_child_node(dev, fwnode) { + /* Cycle for once, no need for an array to save line_num */ + if (fwnode_property_read_u32(fwnode, "ngpios", + &hisi_gpio->line_num)) { + dev_err(dev, + "failed to get number of lines for port%d and use default value instead\n", + idx); + hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX; + } + + if (WARN_ON(hisi_gpio->line_num > HISI_GPIO_LINE_NUM_MAX)) + hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX; + + hisi_gpio->irq = platform_get_irq(pdev, idx); + + dev_info(dev, + "get hisi_gpio[%d] with %d lines\n", idx, + hisi_gpio->line_num); + + idx++; + } +} + +static int hisi_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) +{ + unsigned long flags; + + spin_lock_irqsave(&gc->bgpio_lock, flags); + + gc->bgpio_dir |= BIT(gpio); + + hisi_gpio_write_reg(gc, HISI_GPIO_SWPORT_DDR_CLR_WX, ~gc->bgpio_dir); + hisi_gpio_write_reg(gc, HISI_GPIO_SWPORT_DDR_SET_WX, gc->bgpio_dir); + + spin_unlock_irqrestore(&gc->bgpio_lock, flags); + + gc->set(gc, gpio, val); + + return 0; +} + +static int hisi_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) +{ + unsigned long flags; + + spin_lock_irqsave(&gc->bgpio_lock, flags); + + gc->bgpio_dir &= ~BIT(gpio); + + hisi_gpio_write_reg(gc, HISI_GPIO_SWPORT_DDR_CLR_WX, ~gc->bgpio_dir); + hisi_gpio_write_reg(gc, HISI_GPIO_SWPORT_DDR_SET_WX, gc->bgpio_dir); + + spin_unlock_irqrestore(&gc->bgpio_lock, flags); + + return 0; +} + +static int hisi_gpio_get_dir(struct gpio_chip *gc, unsigned int gpio) +{ + /* Return 0 if output, 1 of input */ + return !(gc->read_reg(gc->reg_dir) & BIT(gpio)); +} + +static int hisi_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct hisi_gpio *hisi_gpio; + struct resource *res; + int port_num; + int ret; + + /* + * One GPIO controller own one port currently, + * if we get more from ACPI table, return error. + */ + port_num = device_get_child_node_count(dev); + if (WARN_ON(port_num != 1)) + return -ENODEV; + + hisi_gpio = devm_kzalloc(dev, sizeof(*hisi_gpio), GFP_KERNEL); + if (!hisi_gpio) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hisi_gpio->reg_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(hisi_gpio->reg_base)) + return PTR_ERR(hisi_gpio->reg_base); + + hisi_gpio_get_pdata(dev, hisi_gpio); + + hisi_gpio->dev = dev; + + hisi_gpio->chip.reg_dir = hisi_gpio->reg_base + + HISI_GPIO_SWPORT_DDR_ST_WX; + + ret = bgpio_init(&hisi_gpio->chip, hisi_gpio->dev, 0x4, + hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX, + hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX, + hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_CLR_WX, + NULL, NULL, 0); + if (ret) { + dev_err(dev, "failed to init, ret = %d\n", ret); + return ret; + } + + hisi_gpio->chip.direction_output = hisi_gpio_dir_out; + hisi_gpio->chip.direction_input = hisi_gpio_dir_in; + hisi_gpio->chip.get_direction = hisi_gpio_get_dir; + hisi_gpio->chip.set_config = hisi_gpio_set_config; + hisi_gpio->chip.ngpio = hisi_gpio->line_num; + hisi_gpio->chip.base = -1; + + if (hisi_gpio->irq > 0) + hisi_gpio_init_irq(hisi_gpio); + + ret = devm_gpiochip_add_data(dev, &hisi_gpio->chip, hisi_gpio); + if (ret) { + dev_err(dev, "failed to register gpiochip, ret = %d\n", ret); + return ret; + } + + return 0; +} + +static struct platform_driver hisi_gpio_driver = { + .driver = { + .name = HISI_GPIO_DRIVER_NAME, + .acpi_match_table = hisi_gpio_acpi_match, + }, + .probe = hisi_gpio_probe, +}; + +module_platform_driver(hisi_gpio_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Luo Jiaxing luojiaxing@huawei.com"); +MODULE_DESCRIPTION("HiSilicon GPIO controller driver"); +MODULE_ALIAS("platform:" HISI_GPIO_DRIVER_NAME);