This bus driver supports the GENI based i2c hardware controller in the Qualcomm SOCs. The Qualcomm Generic Interface (GENI) is a programmable module supporting a wide range of serial interfaces including I2C. The driver supports FIFO mode and DMA mode of transfer and switches modes dynamically depending on the size of the transfer. Signed-off-by: Karthikeyan Ramasubramanian <kramasub@xxxxxxxxxxxxxx> Signed-off-by: Sagar Dharia <sdharia@xxxxxxxxxxxxxx> Signed-off-by: Girish Mahadevan <girishm@xxxxxxxxxxxxxx> --- drivers/i2c/busses/Kconfig | 10 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-qcom-geni.c | 656 +++++++++++++++++++++++++++++++++++++ 3 files changed, 667 insertions(+) create mode 100644 drivers/i2c/busses/i2c-qcom-geni.c diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 009345d..caef309 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -838,6 +838,16 @@ config I2C_PXA_SLAVE is necessary for systems where the PXA may be a target on the I2C bus. +config I2C_QCOM_GENI + tristate "Qualcomm Technologies Inc.'s GENI based I2C controller" + depends on ARCH_QCOM + help + If you say yes to this option, support will be included for the + built-in I2C interface on the Qualcomm Technologies Inc.'s SoCs. + + This driver can also be built as a module. If so, the module + will be called i2c-qcom-geni. + config I2C_QUP tristate "Qualcomm QUP based I2C controller" depends on ARCH_QCOM diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 2ce8576..201fce1 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -84,6 +84,7 @@ obj-$(CONFIG_I2C_PNX) += i2c-pnx.o obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o obj-$(CONFIG_I2C_PXA) += i2c-pxa.o obj-$(CONFIG_I2C_PXA_PCI) += i2c-pxa-pci.o +obj-$(CONFIG_I2C_QCOM_GENI) += i2c-qcom-geni.o obj-$(CONFIG_I2C_QUP) += i2c-qup.o obj-$(CONFIG_I2C_RIIC) += i2c-riic.o obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c new file mode 100644 index 0000000..59ad4da --- /dev/null +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -0,0 +1,656 @@ +/* + * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/dma-mapping.h> +#include <linux/qcom-geni-se.h> + +#define SE_I2C_TX_TRANS_LEN (0x26C) +#define SE_I2C_RX_TRANS_LEN (0x270) +#define SE_I2C_SCL_COUNTERS (0x278) +#define SE_GENI_IOS (0x908) + +#define SE_I2C_ERR (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN |\ + M_GP_IRQ_1_EN | M_GP_IRQ_3_EN | M_GP_IRQ_4_EN) +#define SE_I2C_ABORT (1U << 1) +/* M_CMD OP codes for I2C */ +#define I2C_WRITE (0x1) +#define I2C_READ (0x2) +#define I2C_WRITE_READ (0x3) +#define I2C_ADDR_ONLY (0x4) +#define I2C_BUS_CLEAR (0x6) +#define I2C_STOP_ON_BUS (0x7) +/* M_CMD params for I2C */ +#define PRE_CMD_DELAY (BIT(0)) +#define TIMESTAMP_BEFORE (BIT(1)) +#define STOP_STRETCH (BIT(2)) +#define TIMESTAMP_AFTER (BIT(3)) +#define POST_COMMAND_DELAY (BIT(4)) +#define IGNORE_ADD_NACK (BIT(6)) +#define READ_FINISHED_WITH_ACK (BIT(7)) +#define BYPASS_ADDR_PHASE (BIT(8)) +#define SLV_ADDR_MSK (GENMASK(15, 9)) +#define SLV_ADDR_SHFT (9) + +#define I2C_CORE2X_VOTE (10000) +#define GP_IRQ0 0 +#define GP_IRQ1 1 +#define GP_IRQ2 2 +#define GP_IRQ3 3 +#define GP_IRQ4 4 +#define GP_IRQ5 5 +#define GENI_OVERRUN 6 +#define GENI_ILLEGAL_CMD 7 +#define GENI_ABORT_DONE 8 +#define GENI_TIMEOUT 9 + +#define I2C_NACK GP_IRQ1 +#define I2C_BUS_PROTO GP_IRQ3 +#define I2C_ARB_LOST GP_IRQ4 +#define DM_I2C_CB_ERR ((BIT(GP_IRQ1) | BIT(GP_IRQ3) | BIT(GP_IRQ4)) \ + << 5) + +#define I2C_AUTO_SUSPEND_DELAY 250 +#define KHz(freq) (1000 * freq) + +struct geni_i2c_dev { + struct device *dev; + void __iomem *base; + unsigned int tx_wm; + int irq; + int err; + struct i2c_adapter adap; + struct completion xfer; + struct i2c_msg *cur; + struct geni_se_rsc i2c_rsc; + int cur_wr; + int cur_rd; + struct device *wrapper_dev; + u32 clk_freq_out; + int clk_fld_idx; +}; + +struct geni_i2c_err_log { + int err; + const char *msg; +}; + +static struct geni_i2c_err_log gi2c_log[] = { + [GP_IRQ0] = {-EINVAL, "Unknown I2C err GP_IRQ0"}, + [I2C_NACK] = {-ENOTCONN, + "NACK: slv unresponsive, check its power/reset-ln"}, + [GP_IRQ2] = {-EINVAL, "Unknown I2C err GP IRQ2"}, + [I2C_BUS_PROTO] = {-EPROTO, + "Bus proto err, noisy/unepxected start/stop"}, + [I2C_ARB_LOST] = {-EBUSY, + "Bus arbitration lost, clock line undriveable"}, + [GP_IRQ5] = {-EINVAL, "Unknown I2C err GP IRQ5"}, + [GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"}, + [GENI_ILLEGAL_CMD] = {-EILSEQ, + "Illegal cmd, check GENI cmd-state machine"}, + [GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"}, + [GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"}, +}; + +struct geni_i2c_clk_fld { + u32 clk_freq_out; + u8 clk_div; + u8 t_high; + u8 t_low; + u8 t_cycle; +}; + +static struct geni_i2c_clk_fld geni_i2c_clk_map[] = { + {KHz(100), 7, 10, 11, 26}, + {KHz(400), 2, 5, 12, 24}, + {KHz(1000), 1, 3, 9, 18}, +}; + +static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c) +{ + int i; + int ret = 0; + bool clk_map_present = false; + struct geni_i2c_clk_fld *itr = geni_i2c_clk_map; + + for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) { + if (itr->clk_freq_out == gi2c->clk_freq_out) { + clk_map_present = true; + break; + } + } + + if (clk_map_present) + gi2c->clk_fld_idx = i; + else + ret = -EINVAL; + + return ret; +} + +static inline void qcom_geni_i2c_conf(struct geni_i2c_dev *gi2c, int dfs) +{ + struct geni_i2c_clk_fld *itr = geni_i2c_clk_map + gi2c->clk_fld_idx; + + geni_write_reg(dfs, gi2c->base, SE_GENI_CLK_SEL); + + geni_write_reg((itr->clk_div << 4) | 1, gi2c->base, GENI_SER_M_CLK_CFG); + geni_write_reg(((itr->t_high << 20) | (itr->t_low << 10) | + itr->t_cycle), gi2c->base, SE_I2C_SCL_COUNTERS); + + /* Ensure Clk config completes before return */ + mb(); +} + +static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err) +{ + u32 m_cmd = readl_relaxed(gi2c->base + SE_GENI_M_CMD0); + u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS); + u32 geni_s = readl_relaxed(gi2c->base + SE_GENI_STATUS); + u32 geni_ios = readl_relaxed(gi2c->base + SE_GENI_IOS); + u32 dma = readl_relaxed(gi2c->base + SE_GENI_DMA_MODE_EN); + u32 rx_st, tx_st; + + if (gi2c->cur) + dev_dbg(gi2c->dev, "len:%d, slv-addr:0x%x, RD/WR:%d\n", + gi2c->cur->len, gi2c->cur->addr, gi2c->cur->flags); + + if (err == I2C_NACK || err == GENI_ABORT_DONE) { + dev_dbg(gi2c->dev, "%s\n", gi2c_log[err].msg); + goto err_ret; + } else { + dev_err(gi2c->dev, "%s\n", gi2c_log[err].msg); + } + + if (dma) { + rx_st = readl_relaxed(gi2c->base + SE_DMA_RX_IRQ_STAT); + tx_st = readl_relaxed(gi2c->base + SE_DMA_TX_IRQ_STAT); + } else { + rx_st = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS); + tx_st = readl_relaxed(gi2c->base + SE_GENI_TX_FIFO_STATUS); + } + dev_dbg(gi2c->dev, "DMA:%d tx_stat:0x%x, rx_stat:0x%x, irq-stat:0x%x\n", + dma, tx_st, rx_st, m_stat); + dev_dbg(gi2c->dev, "m_cmd:0x%x, geni_status:0x%x, geni_ios:0x%x\n", + m_cmd, geni_s, geni_ios); +err_ret: + gi2c->err = gi2c_log[err].err; +} + +static irqreturn_t geni_i2c_irq(int irq, void *dev) +{ + struct geni_i2c_dev *gi2c = dev; + int i, j; + u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS); + u32 rx_st = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS); + u32 dm_tx_st = readl_relaxed(gi2c->base + SE_DMA_TX_IRQ_STAT); + u32 dm_rx_st = readl_relaxed(gi2c->base + SE_DMA_RX_IRQ_STAT); + u32 dma = readl_relaxed(gi2c->base + SE_GENI_DMA_MODE_EN); + struct i2c_msg *cur = gi2c->cur; + + if (!cur || (m_stat & M_CMD_FAILURE_EN) || + (dm_rx_st & (DM_I2C_CB_ERR)) || + (m_stat & M_CMD_ABORT_EN)) { + + if (m_stat & M_GP_IRQ_1_EN) + geni_i2c_err(gi2c, I2C_NACK); + if (m_stat & M_GP_IRQ_3_EN) + geni_i2c_err(gi2c, I2C_BUS_PROTO); + if (m_stat & M_GP_IRQ_4_EN) + geni_i2c_err(gi2c, I2C_ARB_LOST); + if (m_stat & M_CMD_OVERRUN_EN) + geni_i2c_err(gi2c, GENI_OVERRUN); + if (m_stat & M_ILLEGAL_CMD_EN) + geni_i2c_err(gi2c, GENI_ILLEGAL_CMD); + if (m_stat & M_CMD_ABORT_EN) + geni_i2c_err(gi2c, GENI_ABORT_DONE); + if (m_stat & M_GP_IRQ_0_EN) + geni_i2c_err(gi2c, GP_IRQ0); + + if (!dma) + writel_relaxed(0, (gi2c->base + + SE_GENI_TX_WATERMARK_REG)); + goto irqret; + } + + if (dma) { + dev_dbg(gi2c->dev, "i2c dma tx:0x%x, dma rx:0x%x\n", dm_tx_st, + dm_rx_st); + goto irqret; + } + + if (((m_stat & M_RX_FIFO_WATERMARK_EN) || + (m_stat & M_RX_FIFO_LAST_EN)) && (cur->flags & I2C_M_RD)) { + u32 rxcnt = rx_st & RX_FIFO_WC_MSK; + + for (j = 0; j < rxcnt; j++) { + u32 temp; + int p; + + temp = readl_relaxed(gi2c->base + SE_GENI_RX_FIFOn); + for (i = gi2c->cur_rd, p = 0; (i < cur->len && p < 4); + i++, p++) + cur->buf[i] = (u8) ((temp >> (p * 8)) & 0xff); + gi2c->cur_rd = i; + if (gi2c->cur_rd == cur->len) { + dev_dbg(gi2c->dev, "FIFO i:%d,read 0x%x\n", + i, temp); + break; + } + } + } else if ((m_stat & M_TX_FIFO_WATERMARK_EN) && + !(cur->flags & I2C_M_RD)) { + for (j = 0; j < gi2c->tx_wm; j++) { + u32 temp = 0; + int p; + + for (i = gi2c->cur_wr, p = 0; (i < cur->len && p < 4); + i++, p++) + temp |= (((u32)(cur->buf[i]) << (p * 8))); + writel_relaxed(temp, gi2c->base + SE_GENI_TX_FIFOn); + gi2c->cur_wr = i; + dev_dbg(gi2c->dev, "FIFO i:%d,wrote 0x%x\n", i, temp); + if (gi2c->cur_wr == cur->len) { + dev_dbg(gi2c->dev, "FIFO i2c bytes done writing\n"); + writel_relaxed(0, + (gi2c->base + SE_GENI_TX_WATERMARK_REG)); + break; + } + } + } +irqret: + if (m_stat) + writel_relaxed(m_stat, gi2c->base + SE_GENI_M_IRQ_CLEAR); + + if (dma) { + if (dm_tx_st) + writel_relaxed(dm_tx_st, gi2c->base + + SE_DMA_TX_IRQ_CLR); + if (dm_rx_st) + writel_relaxed(dm_rx_st, gi2c->base + + SE_DMA_RX_IRQ_CLR); + /* Ensure all writes are done before returning from ISR. */ + wmb(); + } + /* if this is err with done-bit not set, handle that thr' timeout. */ + if (m_stat & M_CMD_DONE_EN) + complete(&gi2c->xfer); + else if ((dm_tx_st & TX_DMA_DONE) || (dm_rx_st & RX_DMA_DONE)) + complete(&gi2c->xfer); + + return IRQ_HANDLED; +} + +static int geni_i2c_xfer(struct i2c_adapter *adap, + struct i2c_msg msgs[], + int num) +{ + struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap); + int i, ret = 0, timeout = 0; + + gi2c->err = 0; + gi2c->cur = &msgs[0]; + reinit_completion(&gi2c->xfer); + ret = pm_runtime_get_sync(gi2c->dev); + if (ret < 0) { + dev_err(gi2c->dev, "error turning SE resources:%d\n", ret); + pm_runtime_put_noidle(gi2c->dev); + /* Set device in suspended since resume failed */ + pm_runtime_set_suspended(gi2c->dev); + return ret; + } + + qcom_geni_i2c_conf(gi2c, 0); + dev_dbg(gi2c->dev, "i2c xfer:num:%d, msgs:len:%d,flg:%d\n", + num, msgs[0].len, msgs[0].flags); + for (i = 0; i < num; i++) { + int stretch = (i < (num - 1)); + u32 m_param = 0; + u32 m_cmd = 0; + dma_addr_t tx_dma = 0; + dma_addr_t rx_dma = 0; + enum geni_se_xfer_mode mode = FIFO_MODE; + + m_param |= (stretch ? STOP_STRETCH : 0); + m_param |= ((msgs[i].addr & 0x7F) << SLV_ADDR_SHFT); + + gi2c->cur = &msgs[i]; + mode = msgs[i].len > 32 ? SE_DMA : FIFO_MODE; + ret = geni_se_select_mode(gi2c->base, mode); + if (ret) { + dev_err(gi2c->dev, "%s: Error mode init %d:%d:%d\n", + __func__, mode, i, msgs[i].len); + break; + } + if (msgs[i].flags & I2C_M_RD) { + dev_dbg(gi2c->dev, + "READ,n:%d,i:%d len:%d, stretch:%d\n", + num, i, msgs[i].len, stretch); + geni_write_reg(msgs[i].len, + gi2c->base, SE_I2C_RX_TRANS_LEN); + m_cmd = I2C_READ; + geni_se_setup_m_cmd(gi2c->base, m_cmd, m_param); + if (mode == SE_DMA) { + ret = geni_se_rx_dma_prep(gi2c->wrapper_dev, + gi2c->base, msgs[i].buf, + msgs[i].len, &rx_dma); + if (ret) { + mode = FIFO_MODE; + ret = geni_se_select_mode(gi2c->base, + mode); + } + } + } else { + dev_dbg(gi2c->dev, + "WRITE:n:%d,i:%d len:%d, stretch:%d, m_param:0x%x\n", + num, i, msgs[i].len, stretch, m_param); + geni_write_reg(msgs[i].len, gi2c->base, + SE_I2C_TX_TRANS_LEN); + m_cmd = I2C_WRITE; + geni_se_setup_m_cmd(gi2c->base, m_cmd, m_param); + if (mode == SE_DMA) { + ret = geni_se_tx_dma_prep(gi2c->wrapper_dev, + gi2c->base, msgs[i].buf, + msgs[i].len, &tx_dma); + if (ret) { + mode = FIFO_MODE; + ret = geni_se_select_mode(gi2c->base, + mode); + } + } + if (mode == FIFO_MODE) /* Get FIFO IRQ */ + geni_write_reg(1, gi2c->base, + SE_GENI_TX_WATERMARK_REG); + } + /* Ensure FIFO write go through before waiting for Done evet */ + mb(); + timeout = wait_for_completion_timeout(&gi2c->xfer, HZ); + if (!timeout) { + geni_i2c_err(gi2c, GENI_TIMEOUT); + gi2c->cur = NULL; + geni_se_abort_m_cmd(gi2c->base); + timeout = wait_for_completion_timeout(&gi2c->xfer, HZ); + } + gi2c->cur_wr = 0; + gi2c->cur_rd = 0; + if (mode == SE_DMA) { + if (gi2c->err) { + if (msgs[i].flags != I2C_M_RD) + writel_relaxed(1, gi2c->base + + SE_DMA_TX_FSM_RST); + else + writel_relaxed(1, gi2c->base + + SE_DMA_RX_FSM_RST); + wait_for_completion_timeout(&gi2c->xfer, HZ); + } + geni_se_rx_dma_unprep(gi2c->wrapper_dev, rx_dma, + msgs[i].len); + geni_se_tx_dma_unprep(gi2c->wrapper_dev, tx_dma, + msgs[i].len); + } + ret = gi2c->err; + if (gi2c->err) { + dev_err(gi2c->dev, "i2c error :%d\n", gi2c->err); + break; + } + } + if (ret == 0) + ret = num; + + pm_runtime_mark_last_busy(gi2c->dev); + pm_runtime_put_autosuspend(gi2c->dev); + gi2c->cur = NULL; + gi2c->err = 0; + dev_dbg(gi2c->dev, "i2c txn ret:%d\n", ret); + return ret; +} + +static u32 geni_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); +} + +static const struct i2c_algorithm geni_i2c_algo = { + .master_xfer = geni_i2c_xfer, + .functionality = geni_i2c_func, +}; + +static int geni_i2c_probe(struct platform_device *pdev) +{ + struct geni_i2c_dev *gi2c; + struct resource *res; + int ret; + + gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL); + if (!gi2c) + return -ENOMEM; + + gi2c->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + + gi2c->wrapper_dev = pdev->dev.parent; + gi2c->i2c_rsc.wrapper_dev = pdev->dev.parent; + gi2c->i2c_rsc.se_clk = devm_clk_get(&pdev->dev, "se-clk"); + if (IS_ERR(gi2c->i2c_rsc.se_clk)) { + ret = PTR_ERR(gi2c->i2c_rsc.se_clk); + dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret); + return ret; + } + + gi2c->base = devm_ioremap_resource(gi2c->dev, res); + if (IS_ERR(gi2c->base)) + return PTR_ERR(gi2c->base); + + gi2c->i2c_rsc.geni_pinctrl = devm_pinctrl_get(&pdev->dev); + if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_pinctrl)) { + dev_err(&pdev->dev, "No pinctrl config specified\n"); + ret = PTR_ERR(gi2c->i2c_rsc.geni_pinctrl); + return ret; + } + gi2c->i2c_rsc.geni_gpio_active = + pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl, + PINCTRL_DEFAULT); + if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_active)) { + dev_err(&pdev->dev, "No default config specified\n"); + ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_active); + return ret; + } + gi2c->i2c_rsc.geni_gpio_sleep = + pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl, + PINCTRL_SLEEP); + if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_sleep)) { + dev_err(&pdev->dev, "No sleep config specified\n"); + ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_sleep); + return ret; + } + + ret = device_property_read_u32(&pdev->dev, "clock-frequency", + &gi2c->clk_freq_out); + if (ret) { + dev_info(&pdev->dev, + "Bus frequency not specified, default to 400KHz.\n"); + gi2c->clk_freq_out = KHz(400); + } + + gi2c->irq = platform_get_irq(pdev, 0); + if (gi2c->irq < 0) { + dev_err(gi2c->dev, "IRQ error for i2c-geni\n"); + return gi2c->irq; + } + + ret = geni_i2c_clk_map_idx(gi2c); + if (ret) { + dev_err(gi2c->dev, "Invalid clk frequency %d KHz: %d\n", + gi2c->clk_freq_out, ret); + return ret; + } + + gi2c->adap.algo = &geni_i2c_algo; + init_completion(&gi2c->xfer); + platform_set_drvdata(pdev, gi2c); + ret = devm_request_irq(gi2c->dev, gi2c->irq, geni_i2c_irq, + IRQF_TRIGGER_HIGH, "i2c_geni", gi2c); + if (ret) { + dev_err(gi2c->dev, "Request_irq failed:%d: err:%d\n", + gi2c->irq, ret); + return ret; + } + disable_irq(gi2c->irq); + i2c_set_adapdata(&gi2c->adap, gi2c); + gi2c->adap.dev.parent = gi2c->dev; + gi2c->adap.dev.of_node = pdev->dev.of_node; + + strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name)); + + pm_runtime_set_suspended(gi2c->dev); + pm_runtime_set_autosuspend_delay(gi2c->dev, I2C_AUTO_SUSPEND_DELAY); + pm_runtime_use_autosuspend(gi2c->dev); + pm_runtime_enable(gi2c->dev); + i2c_add_adapter(&gi2c->adap); + + dev_dbg(gi2c->dev, "I2C probed\n"); + return 0; +} + +static int geni_i2c_remove(struct platform_device *pdev) +{ + struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev); + + pm_runtime_disable(gi2c->dev); + i2c_del_adapter(&gi2c->adap); + return 0; +} + +static int geni_i2c_resume_noirq(struct device *device) +{ + return 0; +} + +#ifdef CONFIG_PM +static int geni_i2c_runtime_suspend(struct device *dev) +{ + struct geni_i2c_dev *gi2c = dev_get_drvdata(dev); + + disable_irq(gi2c->irq); + geni_se_resources_off(&gi2c->i2c_rsc); + return 0; +} + +static int geni_i2c_runtime_resume(struct device *dev) +{ + int ret; + struct geni_i2c_dev *gi2c = dev_get_drvdata(dev); + + ret = geni_se_resources_on(&gi2c->i2c_rsc); + if (ret) + return ret; + + if (!unlikely(gi2c->tx_wm)) { + int proto = geni_se_get_proto(gi2c->base); + int gi2c_tx_depth = geni_se_get_tx_fifo_depth(gi2c->base); + + if (unlikely(proto != I2C)) { + dev_err(gi2c->dev, "Invalid proto %d\n", proto); + geni_se_resources_off(&gi2c->i2c_rsc); + return -ENXIO; + } + + gi2c->tx_wm = gi2c_tx_depth - 1; + geni_se_init(gi2c->base, gi2c->tx_wm, gi2c_tx_depth); + geni_se_config_packing(gi2c->base, 8, 4, true); + dev_dbg(gi2c->dev, "i2c fifo/se-dma mode. fifo depth:%d\n", + gi2c_tx_depth); + } + enable_irq(gi2c->irq); + + return 0; +} + +static int geni_i2c_suspend_noirq(struct device *device) +{ + struct geni_i2c_dev *gi2c = dev_get_drvdata(device); + int ret; + + /* Make sure no transactions are pending */ + ret = i2c_trylock_bus(&gi2c->adap, I2C_LOCK_SEGMENT); + if (!ret) { + dev_err(gi2c->dev, "late I2C transaction request\n"); + return -EBUSY; + } + if (!pm_runtime_status_suspended(device)) { + geni_i2c_runtime_suspend(device); + pm_runtime_disable(device); + pm_runtime_set_suspended(device); + pm_runtime_enable(device); + } + i2c_unlock_bus(&gi2c->adap, I2C_LOCK_SEGMENT); + return 0; +} +#else +static int geni_i2c_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int geni_i2c_runtime_resume(struct device *dev) +{ + return 0; +} + +static int geni_i2c_suspend_noirq(struct device *device) +{ + return 0; +} +#endif + +static const struct dev_pm_ops geni_i2c_pm_ops = { + .suspend_noirq = geni_i2c_suspend_noirq, + .resume_noirq = geni_i2c_resume_noirq, + .runtime_suspend = geni_i2c_runtime_suspend, + .runtime_resume = geni_i2c_runtime_resume, +}; + +static const struct of_device_id geni_i2c_dt_match[] = { + { .compatible = "qcom,i2c-geni" }, + {} +}; +MODULE_DEVICE_TABLE(of, geni_i2c_dt_match); + +static struct platform_driver geni_i2c_driver = { + .probe = geni_i2c_probe, + .remove = geni_i2c_remove, + .driver = { + .name = "i2c_geni", + .pm = &geni_i2c_pm_ops, + .of_match_table = geni_i2c_dt_match, + }, +}; + +module_platform_driver(geni_i2c_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:i2c_geni"); -- Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html