diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 25 | ||||
| -rw-r--r-- | drivers/i2c/busses/Makefile | 2 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-axxia.c | 559 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-cros-ec-tunnel.c | 15 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 96 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-exynos5.c | 71 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-hix5hd2.c | 557 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-i801.c | 3 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-imx.c | 16 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-ismt.c | 2 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-mxs.c | 3 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-rcar.c | 21 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-rk3x.c | 4 |
13 files changed, 1326 insertions, 48 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 2e45ae3796f1..917c3585f45b 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -77,6 +77,16 @@ config I2C_AMD8111 This driver can also be built as a module. If so, the module will be called i2c-amd8111. +config I2C_HIX5HD2 + tristate "Hix5hd2 high-speed I2C driver" + depends on ARCH_HIX5HD2 + help + Say Y here to include support for high-speed I2C controller in the + Hisilicon based hix5hd2 SoCs. + + This driver can also be built as a module. If so, the module + will be called i2c-hix5hd2. + config I2C_I801 tristate "Intel 82801 (ICH/PCH)" depends on PCI @@ -112,6 +122,7 @@ config I2C_I801 Wildcat Point (PCH) Wildcat Point-LP (PCH) BayTrail (SOC) + Sunrise Point-H (PCH) This driver can also be built as a module. If so, the module will be called i2c-i801. @@ -337,6 +348,17 @@ config I2C_AU1550 This driver can also be built as a module. If so, the module will be called i2c-au1550. +config I2C_AXXIA + tristate "Axxia I2C controller" + depends on ARCH_AXXIA || COMPILE_TEST + default ARCH_AXXIA + help + Say yes if you want to support the I2C bus on Axxia platforms. + + Please note that this controller is limited to transfers of maximum + 255 bytes in length. Any attempt to to a larger transfer will return + an error. + config I2C_BCM2835 tristate "Broadcom BCM2835 I2C controller" depends on ARCH_BCM2835 @@ -423,6 +445,7 @@ config I2C_DESIGNWARE_CORE config I2C_DESIGNWARE_PLATFORM tristate "Synopsys DesignWare Platform" select I2C_DESIGNWARE_CORE + depends on (ACPI && COMMON_CLK) || !ACPI help If you say yes to this option, support will be included for the Synopsys DesignWare I2C adapter. Only master mode is supported. @@ -465,7 +488,7 @@ config I2C_EG20T config I2C_EXYNOS5 tristate "Exynos5 high-speed I2C driver" - depends on ARCH_EXYNOS5 && OF + depends on ARCH_EXYNOS && OF default y help High-speed I2C controller on Exynos5 based Samsung SoCs. diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 49bf07e5ef4d..78d56c54ba2b 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -31,6 +31,7 @@ obj-$(CONFIG_I2C_POWERMAC) += i2c-powermac.o # Embedded system I2C/SMBus host controller drivers obj-$(CONFIG_I2C_AT91) += i2c-at91.o obj-$(CONFIG_I2C_AU1550) += i2c-au1550.o +obj-$(CONFIG_I2C_AXXIA) += i2c-axxia.o obj-$(CONFIG_I2C_BCM2835) += i2c-bcm2835.o obj-$(CONFIG_I2C_BLACKFIN_TWI) += i2c-bfin-twi.o obj-$(CONFIG_I2C_CADENCE) += i2c-cadence.o @@ -47,6 +48,7 @@ obj-$(CONFIG_I2C_EG20T) += i2c-eg20t.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_HIX5HD2) += i2c-hix5hd2.o obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o obj-$(CONFIG_I2C_IMX) += i2c-imx.o obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o diff --git a/drivers/i2c/busses/i2c-axxia.c b/drivers/i2c/busses/i2c-axxia.c new file mode 100644 index 000000000000..768a598d8d03 --- /dev/null +++ b/drivers/i2c/busses/i2c-axxia.c @@ -0,0 +1,559 @@ +/* + * This driver implements I2C master functionality using the LSI API2C + * controller. + * + * NOTE: The controller has a limitation in that it can only do transfers of + * maximum 255 bytes at a time. If a larger transfer is attempted, error code + * (-EINVAL) is returned. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + */ +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> + +#define SCL_WAIT_TIMEOUT_NS 25000000 +#define I2C_XFER_TIMEOUT (msecs_to_jiffies(250)) +#define I2C_STOP_TIMEOUT (msecs_to_jiffies(100)) +#define FIFO_SIZE 8 + +#define GLOBAL_CONTROL 0x00 +#define GLOBAL_MST_EN BIT(0) +#define GLOBAL_SLV_EN BIT(1) +#define GLOBAL_IBML_EN BIT(2) +#define INTERRUPT_STATUS 0x04 +#define INTERRUPT_ENABLE 0x08 +#define INT_SLV BIT(1) +#define INT_MST BIT(0) +#define WAIT_TIMER_CONTROL 0x0c +#define WT_EN BIT(15) +#define WT_VALUE(_x) ((_x) & 0x7fff) +#define IBML_TIMEOUT 0x10 +#define IBML_LOW_MEXT 0x14 +#define IBML_LOW_SEXT 0x18 +#define TIMER_CLOCK_DIV 0x1c +#define I2C_BUS_MONITOR 0x20 +#define SOFT_RESET 0x24 +#define MST_COMMAND 0x28 +#define CMD_BUSY (1<<3) +#define CMD_MANUAL (0x00 | CMD_BUSY) +#define CMD_AUTO (0x01 | CMD_BUSY) +#define MST_RX_XFER 0x2c +#define MST_TX_XFER 0x30 +#define MST_ADDR_1 0x34 +#define MST_ADDR_2 0x38 +#define MST_DATA 0x3c +#define MST_TX_FIFO 0x40 +#define MST_RX_FIFO 0x44 +#define MST_INT_ENABLE 0x48 +#define MST_INT_STATUS 0x4c +#define MST_STATUS_RFL (1 << 13) /* RX FIFO serivce */ +#define MST_STATUS_TFL (1 << 12) /* TX FIFO service */ +#define MST_STATUS_SNS (1 << 11) /* Manual mode done */ +#define MST_STATUS_SS (1 << 10) /* Automatic mode done */ +#define MST_STATUS_SCC (1 << 9) /* Stop complete */ +#define MST_STATUS_IP (1 << 8) /* Invalid parameter */ +#define MST_STATUS_TSS (1 << 7) /* Timeout */ +#define MST_STATUS_AL (1 << 6) /* Arbitration lost */ +#define MST_STATUS_ND (1 << 5) /* NAK on data phase */ +#define MST_STATUS_NA (1 << 4) /* NAK on address phase */ +#define MST_STATUS_NAK (MST_STATUS_NA | \ + MST_STATUS_ND) +#define MST_STATUS_ERR (MST_STATUS_NAK | \ + MST_STATUS_AL | \ + MST_STATUS_IP | \ + MST_STATUS_TSS) +#define MST_TX_BYTES_XFRD 0x50 +#define MST_RX_BYTES_XFRD 0x54 +#define SCL_HIGH_PERIOD 0x80 +#define SCL_LOW_PERIOD 0x84 +#define SPIKE_FLTR_LEN 0x88 +#define SDA_SETUP_TIME 0x8c +#define SDA_HOLD_TIME 0x90 + +/** + * axxia_i2c_dev - I2C device context + * @base: pointer to register struct + * @msg: pointer to current message + * @msg_xfrd: number of bytes transferred in msg + * @msg_err: error code for completed message + * @msg_complete: xfer completion object + * @dev: device reference + * @adapter: core i2c abstraction + * @i2c_clk: clock reference for i2c input clock + * @bus_clk_rate: current i2c bus clock rate + */ +struct axxia_i2c_dev { + void __iomem *base; + struct i2c_msg *msg; + size_t msg_xfrd; + int msg_err; + struct completion msg_complete; + struct device *dev; + struct i2c_adapter adapter; + struct clk *i2c_clk; + u32 bus_clk_rate; +}; + +static void i2c_int_disable(struct axxia_i2c_dev *idev, u32 mask) +{ + u32 int_en; + + int_en = readl(idev->base + MST_INT_ENABLE); + writel(int_en & ~mask, idev->base + MST_INT_ENABLE); +} + +static void i2c_int_enable(struct axxia_i2c_dev *idev, u32 mask) +{ + u32 int_en; + + int_en = readl(idev->base + MST_INT_ENABLE); + writel(int_en | mask, idev->base + MST_INT_ENABLE); +} + +/** + * ns_to_clk - Convert time (ns) to clock cycles for the given clock frequency. + */ +static u32 ns_to_clk(u64 ns, u32 clk_mhz) +{ + return div_u64(ns * clk_mhz, 1000); +} + +static int axxia_i2c_init(struct axxia_i2c_dev *idev) +{ + u32 divisor = clk_get_rate(idev->i2c_clk) / idev->bus_clk_rate; + u32 clk_mhz = clk_get_rate(idev->i2c_clk) / 1000000; + u32 t_setup; + u32 t_high, t_low; + u32 tmo_clk; + u32 prescale; + unsigned long timeout; + + dev_dbg(idev->dev, "rate=%uHz per_clk=%uMHz -> ratio=1:%u\n", + idev->bus_clk_rate, clk_mhz, divisor); + + /* Reset controller */ + writel(0x01, idev->base + SOFT_RESET); + timeout = jiffies + msecs_to_jiffies(100); + while (readl(idev->base + SOFT_RESET) & 1) { + if (time_after(jiffies, timeout)) { + dev_warn(idev->dev, "Soft reset failed\n"); + break; + } + } + + /* Enable Master Mode */ + writel(0x1, idev->base + GLOBAL_CONTROL); + + if (idev->bus_clk_rate <= 100000) { + /* Standard mode SCL 50/50, tSU:DAT = 250 ns */ + t_high = divisor * 1 / 2; + t_low = divisor * 1 / 2; + t_setup = ns_to_clk(250, clk_mhz); + } else { + /* Fast mode SCL 33/66, tSU:DAT = 100 ns */ + t_high = divisor * 1 / 3; + t_low = divisor * 2 / 3; + t_setup = ns_to_clk(100, clk_mhz); + } + + /* SCL High Time */ + writel(t_high, idev->base + SCL_HIGH_PERIOD); + /* SCL Low Time */ + writel(t_low, idev->base + SCL_LOW_PERIOD); + /* SDA Setup Time */ + writel(t_setup, idev->base + SDA_SETUP_TIME); + /* SDA Hold Time, 300ns */ + writel(ns_to_clk(300, clk_mhz), idev->base + SDA_HOLD_TIME); + /* Filter <50ns spikes */ + writel(ns_to_clk(50, clk_mhz), idev->base + SPIKE_FLTR_LEN); + + /* Configure Time-Out Registers */ + tmo_clk = ns_to_clk(SCL_WAIT_TIMEOUT_NS, clk_mhz); + + /* Find prescaler value that makes tmo_clk fit in 15-bits counter. */ + for (prescale = 0; prescale < 15; ++prescale) { + if (tmo_clk <= 0x7fff) + break; + tmo_clk >>= 1; + } + if (tmo_clk > 0x7fff) + tmo_clk = 0x7fff; + + /* Prescale divider (log2) */ + writel(prescale, idev->base + TIMER_CLOCK_DIV); + /* Timeout in divided clocks */ + writel(WT_EN | WT_VALUE(tmo_clk), idev->base + WAIT_TIMER_CONTROL); + + /* Mask all master interrupt bits */ + i2c_int_disable(idev, ~0); + + /* Interrupt enable */ + writel(0x01, idev->base + INTERRUPT_ENABLE); + + return 0; +} + +static int i2c_m_rd(const struct i2c_msg *msg) +{ + return (msg->flags & I2C_M_RD) != 0; +} + +static int i2c_m_ten(const struct i2c_msg *msg) +{ + return (msg->flags & I2C_M_TEN) != 0; +} + +static int i2c_m_recv_len(const struct i2c_msg *msg) +{ + return (msg->flags & I2C_M_RECV_LEN) != 0; +} + +/** + * axxia_i2c_empty_rx_fifo - Fetch data from RX FIFO and update SMBus block + * transfer length if this is the first byte of such a transfer. + */ +static int axxia_i2c_empty_rx_fifo(struct axxia_i2c_dev *idev) +{ + struct i2c_msg *msg = idev->msg; + size_t rx_fifo_avail = readl(idev->base + MST_RX_FIFO); + int bytes_to_transfer = min(rx_fifo_avail, msg->len - idev->msg_xfrd); + + while (bytes_to_transfer-- > 0) { + int c = readl(idev->base + MST_DATA); + + if (idev->msg_xfrd == 0 && i2c_m_recv_len(msg)) { + /* + * Check length byte for SMBus block read + */ + if (c <= 0 || c > I2C_SMBUS_BLOCK_MAX) { + idev->msg_err = -EPROTO; + i2c_int_disable(idev, ~0); + complete(&idev->msg_complete); + break; + } + msg->len = 1 + c; + writel(msg->len, idev->base + MST_RX_XFER); + } + msg->buf[idev->msg_xfrd++] = c; + } + + return 0; +} + +/** + * axxia_i2c_fill_tx_fifo - Fill TX FIFO from current message buffer. + * @return: Number of bytes left to transfer. + */ +static int axxia_i2c_fill_tx_fifo(struct axxia_i2c_dev *idev) +{ + struct i2c_msg *msg = idev->msg; + size_t tx_fifo_avail = FIFO_SIZE - readl(idev->base + MST_TX_FIFO); + int bytes_to_transfer = min(tx_fifo_avail, msg->len - idev->msg_xfrd); + int ret = msg->len - idev->msg_xfrd - bytes_to_transfer; + + while (bytes_to_transfer-- > 0) + writel(msg->buf[idev->msg_xfrd++], idev->base + MST_DATA); + + return ret; +} + +static irqreturn_t axxia_i2c_isr(int irq, void *_dev) +{ + struct axxia_i2c_dev *idev = _dev; + u32 status; + + if (!(readl(idev->base + INTERRUPT_STATUS) & INT_MST)) + return IRQ_NONE; + + /* Read interrupt status bits */ + status = readl(idev->base + MST_INT_STATUS); + + if (!idev->msg) { + dev_warn(idev->dev, "unexpected interrupt\n"); + goto out; + } + + /* RX FIFO needs service? */ + if (i2c_m_rd(idev->msg) && (status & MST_STATUS_RFL)) + axxia_i2c_empty_rx_fifo(idev); + + /* TX FIFO needs service? */ + if (!i2c_m_rd(idev->msg) && (status & MST_STATUS_TFL)) { + if (axxia_i2c_fill_tx_fifo(idev) == 0) + i2c_int_disable(idev, MST_STATUS_TFL); + } + + if (status & MST_STATUS_SCC) { + /* Stop completed */ + i2c_int_disable(idev, ~0); + complete(&idev->msg_complete); + } else if (status & MST_STATUS_SNS) { + /* Transfer done */ + i2c_int_disable(idev, ~0); + if (i2c_m_rd(idev->msg) && idev->msg_xfrd < idev->msg->len) + axxia_i2c_empty_rx_fifo(idev); + complete(&idev->msg_complete); + } else if (unlikely(status & MST_STATUS_ERR)) { + /* Transfer error */ + i2c_int_disable(idev, ~0); + if (status & MST_STATUS_AL) + idev->msg_err = -EAGAIN; + else if (status & MST_STATUS_NAK) + idev->msg_err = -ENXIO; + else + idev->msg_err = -EIO; + dev_dbg(idev->dev, "error %#x, addr=%#x rx=%u/%u tx=%u/%u\n", + status, + idev->msg->addr, + readl(idev->base + MST_RX_BYTES_XFRD), + readl(idev->base + MST_RX_XFER), + readl(idev->base + MST_TX_BYTES_XFRD), + readl(idev->base + MST_TX_XFER)); + complete(&idev->msg_complete); + } + +out: + /* Clear interrupt */ + writel(INT_MST, idev->base + INTERRUPT_STATUS); + + return IRQ_HANDLED; +} + +static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg) +{ + u32 int_mask = MST_STATUS_ERR | MST_STATUS_SNS; + u32 rx_xfer, tx_xfer; + u32 addr_1, addr_2; + int ret; + + if (msg->len > 255) { + dev_warn(idev->dev, "unsupported length %u\n", msg->len); + return -EINVAL; + } + + idev->msg = msg; + idev->msg_xfrd = 0; + idev->msg_err = 0; + reinit_completion(&idev->msg_complete); + + if (i2c_m_ten(msg)) { + /* 10-bit address + * addr_1: 5'b11110 | addr[9:8] | (R/nW) + * addr_2: addr[7:0] + */ + addr_1 = 0xF0 | ((msg->addr >> 7) & 0x06); + addr_2 = msg->addr & 0xFF; + } else { + /* 7-bit address + * addr_1: addr[6:0] | (R/nW) + * addr_2: dont care + */ + addr_1 = (msg->addr << 1) & 0xFF; + addr_2 = 0; + } + + if (i2c_m_rd(msg)) { + /* I2C read transfer */ + rx_xfer = i2c_m_recv_len(msg) ? I2C_SMBUS_BLOCK_MAX : msg->len; + tx_xfer = 0; + addr_1 |= 1; /* Set the R/nW bit of the address */ + } else { + /* I2C write transfer */ + rx_xfer = 0; + tx_xfer = msg->len; + } + + writel(rx_xfer, idev->base + MST_RX_XFER); + writel(tx_xfer, idev->base + MST_TX_XFER); + writel(addr_1, idev->base + MST_ADDR_1); + writel(addr_2, idev->base + MST_ADDR_2); + + if (i2c_m_rd(msg)) + int_mask |= MST_STATUS_RFL; + else if (axxia_i2c_fill_tx_fifo(idev) != 0) + int_mask |= MST_STATUS_TFL; + + /* Start manual mode */ + writel(CMD_MANUAL, idev->base + MST_COMMAND); + + i2c_int_enable(idev, int_mask); + + ret = wait_for_completion_timeout(&idev->msg_complete, + I2C_XFER_TIMEOUT); + + i2c_int_disable(idev, int_mask); + + if (readl(idev->base + MST_COMMAND) & CMD_BUSY) + dev_warn(idev->dev, "busy after xfer\n"); + + if (ret == 0) + idev->msg_err = -ETIMEDOUT; + + if (unlikely(idev->msg_err) && idev->msg_err != -ENXIO) + axxia_i2c_init(idev); + + return idev->msg_err; +} + +static int axxia_i2c_stop(struct axxia_i2c_dev *idev) +{ + u32 int_mask = MST_STATUS_ERR | MST_STATUS_SCC; + int ret; + + reinit_completion(&idev->msg_complete); + + /* Issue stop */ + writel(0xb, idev->base + MST_COMMAND); + i2c_int_enable(idev, int_mask); + ret = wait_for_completion_timeout(&idev->msg_complete, + I2C_STOP_TIMEOUT); + i2c_int_disable(idev, int_mask); + if (ret == 0) + return -ETIMEDOUT; + + if (readl(idev->base + MST_COMMAND) & CMD_BUSY) + dev_warn(idev->dev, "busy after stop\n"); + + return 0; +} + +static int +axxia_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) +{ + struct axxia_i2c_dev *idev = i2c_get_adapdata(adap); + int i; + int ret = 0; + + for (i = 0; ret == 0 && i < num; ++i) + ret = axxia_i2c_xfer_msg(idev, &msgs[i]); + + axxia_i2c_stop(idev); + + return ret ? : i; +} + +static u32 axxia_i2c_func(struct i2c_adapter *adap) +{ + u32 caps = (I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | + I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_BLOCK_DATA); + return caps; +} + +static const struct i2c_algorithm axxia_i2c_algo = { + .master_xfer = axxia_i2c_xfer, + .functionality = axxia_i2c_func, +}; + +static int axxia_i2c_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct axxia_i2c_dev *idev = NULL; + struct resource *res; + void __iomem *base; + int irq; + int ret = 0; + + idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL); + if (!idev) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "missing interrupt resource\n"); + return irq; + } + + idev->i2c_clk = devm_clk_get(&pdev->dev, "i2c"); + if (IS_ERR(idev->i2c_clk)) { + dev_err(&pdev->dev, "missing clock\n"); + return PTR_ERR(idev->i2c_clk); + } + + idev->base = base; + idev->dev = &pdev->dev; + init_completion(&idev->msg_complete); + + of_property_read_u32(np, "clock-frequency", &idev->bus_clk_rate); + if (idev->bus_clk_rate == 0) + idev->bus_clk_rate = 100000; /* default clock rate */ + + ret = axxia_i2c_init(idev); + if (ret) { + dev_err(&pdev->dev, "failed to initialize\n"); + return ret; + } + + ret = devm_request_irq(&pdev->dev, irq, axxia_i2c_isr, 0, + pdev->name, idev); + if (ret) { + dev_err(&pdev->dev, "failed to claim IRQ%d\n", irq); + return ret; + } + + clk_prepare_enable(idev->i2c_clk); + + i2c_set_adapdata(&idev->adapter, idev); + strlcpy(idev->adapter.name, pdev->name, sizeof(idev->adapter.name)); + idev->adapter.owner = THIS_MODULE; + idev->adapter.algo = &axxia_i2c_algo; + idev->adapter.dev.parent = &pdev->dev; + idev->adapter.dev.of_node = pdev->dev.of_node; + + platform_set_drvdata(pdev, idev); + + ret = i2c_add_adapter(&idev->adapter); + if (ret) { + dev_err(&pdev->dev, "failed to add adapter\n"); + return ret; + } + + return 0; +} + +static int axxia_i2c_remove(struct platform_device *pdev) +{ + struct axxia_i2c_dev *idev = platform_get_drvdata(pdev); + + clk_disable_unprepare(idev->i2c_clk); + i2c_del_adapter(&idev->adapter); + + return 0; +} + +/* Match table for of_platform binding */ +static const struct of_device_id axxia_i2c_of_match[] = { + { .compatible = "lsi,api2c", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, axxia_i2c_of_match); + +static struct platform_driver axxia_i2c_driver = { + .probe = axxia_i2c_probe, + .remove = axxia_i2c_remove, + .driver = { + .name = "axxia-i2c", + .of_match_table = axxia_i2c_of_match, + }, +}; + +module_platform_driver(axxia_i2c_driver); + +MODULE_DESCRIPTION("Axxia I2C Bus driver"); +MODULE_AUTHOR("Anders Berg <anders.berg@lsi.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/i2c/busses/i2c-cros-ec-tunnel.c b/drivers/i2c/busses/i2c-cros-ec-tunnel.c index 8ca5cbbcec91..875c22ae5400 100644 --- a/drivers/i2c/busses/i2c-cros-ec-tunnel.c +++ b/drivers/i2c/busses/i2c-cros-ec-tunnel.c @@ -96,7 +96,7 @@ static int ec_i2c_construct_message(u8 *buf, const struct i2c_msg i2c_msgs[], msg->addr_flags = i2c_msg->addr; if (i2c_msg->flags & I2C_M_TEN) - msg->addr_flags |= EC_I2C_FLAG_10BIT; + return -EINVAL; if (i2c_msg->flags & I2C_M_RD) { msg->addr_flags |= EC_I2C_FLAG_READ; @@ -220,7 +220,9 @@ static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[], } } - ec_i2c_construct_message(request, i2c_msgs, num, bus_num); + result = ec_i2c_construct_message(request, i2c_msgs, num, bus_num); + if (result) + goto exit; msg.version = 0; msg.command = EC_CMD_I2C_PASSTHRU; @@ -313,11 +315,20 @@ static int ec_i2c_remove(struct platform_device *dev) return 0; } +#ifdef CONFIG_OF +static const struct of_device_id cros_ec_i2c_of_match[] = { + { .compatible = "google,cros-ec-i2c-tunnel" }, + {}, +}; +MODULE_DEVICE_TABLE(of, cros_ec_i2c_of_match); +#endif + static struct platform_driver ec_i2c_tunnel_driver = { .probe = ec_i2c_probe, .remove = ec_i2c_remove, .driver = { .name = "cros-ec-i2c-tunnel", + .of_match_table = of_match_ptr(cros_ec_i2c_of_match), }, }; diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index bc8773333155..a7431150acf7 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -30,6 +30,7 @@ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/clk.h> +#include <linux/clk-provider.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/err.h> @@ -41,6 +42,7 @@ #include <linux/io.h> #include <linux/slab.h> #include <linux/acpi.h> +#include <linux/platform_data/i2c-designware.h> #include "i2c-designware-core.h" static struct i2c_algorithm i2c_dw_algo = { @@ -79,10 +81,7 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], static int dw_i2c_acpi_configure(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); - bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST; - - if (!ACPI_HANDLE(&pdev->dev)) - return -ENODEV; + const struct acpi_device_id *id; dev->adapter.nr = -1; dev->tx_fifo_depth = 32; @@ -92,14 +91,33 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev) * Try to get SDA hold time and *CNT values from an ACPI method if * it exists for both supported speed modes. */ - dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, - fs_mode ? NULL : &dev->sda_hold_time); + dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL); dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, - fs_mode ? &dev->sda_hold_time : NULL); + &dev->sda_hold_time); + + /* + * Provide a way for Designware I2C host controllers that are not + * based on Intel LPSS to specify their input clock frequency via + * id->driver_data. + */ + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id && id->driver_data) + clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL, + CLK_IS_ROOT, id->driver_data); return 0; } +static void dw_i2c_acpi_unconfigure(struct platform_device *pdev) +{ + struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + const struct acpi_device_id *id; + + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id && id->driver_data) + clk_unregister(dev->clk); +} + static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT33C2", 0 }, { "INT33C3", 0 }, @@ -107,6 +125,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT3433", 0 }, { "80860F41", 0 }, { "808622C1", 0 }, + { "AMD0010", 133 * 1000 * 1000 }, { } }; MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); @@ -115,6 +134,7 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev) { return -ENODEV; } +static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { } #endif static int dw_i2c_probe(struct platform_device *pdev) @@ -122,7 +142,9 @@ static int dw_i2c_probe(struct platform_device *pdev) struct dw_i2c_dev *dev; struct i2c_adapter *adap; struct resource *mem; + struct dw_i2c_platform_data *pdata; int irq, r; + u32 clk_freq, ht = 0; irq = platform_get_irq(pdev, 0); if (irq < 0) { @@ -145,21 +167,14 @@ static int dw_i2c_probe(struct platform_device *pdev) dev->irq = irq; platform_set_drvdata(pdev, dev); - dev->clk = devm_clk_get(&pdev->dev, NULL); - dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; - - if (IS_ERR(dev->clk)) - return PTR_ERR(dev->clk); - clk_prepare_enable(dev->clk); - - if (pdev->dev.of_node) { - u32 ht = 0; - u32 ic_clk = dev->get_clk_rate_khz(dev); + /* fast mode by default because of legacy reasons */ + clk_freq = 400000; + if (ACPI_COMPANION(&pdev->dev)) { + dw_i2c_acpi_configure(pdev); + } else if (pdev->dev.of_node) { of_property_read_u32(pdev->dev.of_node, "i2c-sda-hold-time-ns", &ht); - dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, - 1000000); of_property_read_u32(pdev->dev.of_node, "i2c-sda-falling-time-ns", @@ -167,6 +182,21 @@ static int dw_i2c_probe(struct platform_device *pdev) of_property_read_u32(pdev->dev.of_node, "i2c-scl-falling-time-ns", &dev->scl_falling_time); + + of_property_read_u32(pdev->dev.of_node, "clock-frequency", + &clk_freq); + + /* Only standard mode at 100kHz and fast mode at 400kHz + * are supported. + */ + if (clk_freq != 100000 && clk_freq != 400000) { + dev_err(&pdev->dev, "Only 100kHz and 400kHz supported"); + return -EINVAL; + } + } else { + pdata = dev_get_platdata(&pdev->dev); + if (pdata) + clk_freq = pdata->i2c_scl_freq; } dev->functionality = @@ -176,12 +206,27 @@ static int dw_i2c_probe(struct platform_device *pdev) I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_I2C_BLOCK; - dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | - DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; + if (clk_freq == 100000) + dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | + DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD; + else + dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | + DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; - /* Try first if we can configure the device from ACPI */ - r = dw_i2c_acpi_configure(pdev); - if (r) { + dev->clk = devm_clk_get(&pdev->dev, NULL); + dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; + if (IS_ERR(dev->clk)) + return PTR_ERR(dev->clk); + clk_prepare_enable(dev->clk); + + if (!dev->sda_hold_time && ht) { + u32 ic_clk = dev->get_clk_rate_khz(dev); + + dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, + 1000000); + } + + if (!dev->tx_fifo_depth) { u32 param1 = i2c_dw_read_comp_param(dev); dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; @@ -237,6 +282,9 @@ static int dw_i2c_remove(struct platform_device *pdev) pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); + if (ACPI_COMPANION(&pdev->dev)) + dw_i2c_acpi_unconfigure(pdev); + return 0; } diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c index 28073f1d6d47..81e6263cd7da 100644 --- a/drivers/i2c/busses/i2c-exynos5.c +++ b/drivers/i2c/busses/i2c-exynos5.c @@ -83,7 +83,6 @@ #define HSI2C_INT_TX_ALMOSTEMPTY_EN (1u << 0) #define HSI2C_INT_RX_ALMOSTFULL_EN (1u << 1) #define HSI2C_INT_TRAILING_EN (1u << 6) -#define HSI2C_INT_I2C_EN (1u << 9) /* I2C_INT_STAT Register bits */ #define HSI2C_INT_TX_ALMOSTEMPTY (1u << 0) @@ -95,6 +94,17 @@ #define HSI2C_INT_TRAILING (1u << 6) #define HSI2C_INT_I2C (1u << 9) +#define HSI2C_INT_TRANS_DONE (1u << 7) +#define HSI2C_INT_TRANS_ABORT (1u << 8) +#define HSI2C_INT_NO_DEV_ACK (1u << 9) +#define HSI2C_INT_NO_DEV (1u << 10) +#define HSI2C_INT_TIMEOUT (1u << 11) +#define HSI2C_INT_I2C_TRANS (HSI2C_INT_TRANS_DONE | \ + HSI2C_INT_TRANS_ABORT | \ + HSI2C_INT_NO_DEV_ACK | \ + HSI2C_INT_NO_DEV | \ + HSI2C_INT_TIMEOUT) + /* I2C_FIFO_STAT Register bits */ #define HSI2C_RX_FIFO_EMPTY (1u << 24) #define HSI2C_RX_FIFO_FULL (1u << 23) @@ -143,6 +153,8 @@ #define EXYNOS5_I2C_TIMEOUT (msecs_to_jiffies(1000)) +#define HSI2C_EXYNOS7 BIT(0) + struct exynos5_i2c { struct i2c_adapter adap; unsigned int suspended:1; @@ -192,6 +204,7 @@ struct exynos5_i2c { */ struct exynos_hsi2c_variant { unsigned int fifo_depth; + unsigned int hw; }; static const struct exynos_hsi2c_variant exynos5250_hsi2c_data = { @@ -202,6 +215,11 @@ static const struct exynos_hsi2c_variant exynos5260_hsi2c_data = { .fifo_depth = 16, }; +static const struct exynos_hsi2c_variant exynos7_hsi2c_data = { + .fifo_depth = 16, + .hw = HSI2C_EXYNOS7, +}; + static const struct of_device_id exynos5_i2c_match[] = { { .compatible = "samsung,exynos5-hsi2c", @@ -212,6 +230,9 @@ static const struct of_device_id exynos5_i2c_match[] = { }, { .compatible = "samsung,exynos5260-hsi2c", .data = &exynos5260_hsi2c_data + }, { + .compatible = "samsung,exynos7-hsi2c", + .data = &exynos7_hsi2c_data }, {}, }; MODULE_DEVICE_TABLE(of, exynos5_i2c_match); @@ -256,13 +277,24 @@ static int exynos5_i2c_set_timing(struct exynos5_i2c *i2c, int mode) i2c->hs_clock : i2c->fs_clock; /* + * In case of HSI2C controller in Exynos5 series * FPCLK / FI2C = * (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + 8 + 2 * FLT_CYCLE + * + * In case of HSI2C controllers in Exynos7 series + * FPCLK / FI2C = + * (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + 8 + FLT_CYCLE + * * utemp0 = (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) * utemp1 = (TSCLK_L + TSCLK_H + 2) */ t_ftl_cycle = (readl(i2c->regs + HSI2C_CONF) >> 16) & 0x7; - utemp0 = (clkin / op_clk) - 8 - 2 * t_ftl_cycle; + utemp0 = (clkin / op_clk) - 8; + + if (i2c->variant->hw == HSI2C_EXYNOS7) + utemp0 -= t_ftl_cycle; + else + utemp0 -= 2 * t_ftl_cycle; /* CLK_DIV max is 256 */ for (div = 0; div < 256; div++) { @@ -407,7 +439,28 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id) writel(int_status, i2c->regs + HSI2C_INT_STATUS); /* handle interrupt related to the transfer status */ - if (int_status & HSI2C_INT_I2C) { + if (i2c->variant->hw == HSI2C_EXYNOS7) { + if (int_status & HSI2C_INT_TRANS_DONE) { + i2c->trans_done = 1; + i2c->state = 0; + } else if (int_status & HSI2C_INT_TRANS_ABORT) { + dev_dbg(i2c->dev, "Deal with arbitration lose\n"); + i2c->state = -EAGAIN; + goto stop; + } else if (int_status & HSI2C_INT_NO_DEV_ACK) { + dev_dbg(i2c->dev, "No ACK from device\n"); + i2c->state = -ENXIO; + goto stop; + } else if (int_status & HSI2C_INT_NO_DEV) { + dev_dbg(i2c->dev, "No device\n"); + i2c->state = -ENXIO; + goto stop; + } else if (int_status & HSI2C_INT_TIMEOUT) { + dev_dbg(i2c->dev, "Accessing device timed out\n"); + i2c->state = -EAGAIN; + goto stop; + } + } else if (int_status & HSI2C_INT_I2C) { trans_status = readl(i2c->regs + HSI2C_TRANS_STATUS); if (trans_status & HSI2C_NO_DEV_ACK) { dev_dbg(i2c->dev, "No ACK from device\n"); @@ -512,12 +565,17 @@ static int exynos5_i2c_wait_bus_idle(struct exynos5_i2c *i2c) static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop) { u32 i2c_ctl; - u32 int_en = HSI2C_INT_I2C_EN; + u32 int_en = 0; u32 i2c_auto_conf = 0; u32 fifo_ctl; unsigned long flags; unsigned short trig_lvl; + if (i2c->variant->hw == HSI2C_EXYNOS7) + int_en |= HSI2C_INT_I2C_TRANS; + else + int_en |= HSI2C_INT_I2C; + i2c_ctl = readl(i2c->regs + HSI2C_CTL); i2c_ctl &= ~(HSI2C_TXCHON | HSI2C_RXCHON); fifo_ctl = HSI2C_RXFIFO_EN | HSI2C_TXFIFO_EN; @@ -724,12 +782,13 @@ static int exynos5_i2c_probe(struct platform_device *pdev) goto err_clk; } + /* Need to check the variant before setting up. */ + i2c->variant = exynos5_i2c_get_variant(pdev); + ret = exynos5_hsi2c_clock_setup(i2c); if (ret) goto err_clk; - i2c->variant = exynos5_i2c_get_variant(pdev); - exynos5_i2c_reset(i2c); ret = i2c_add_adapter(&i2c->adap); diff --git a/drivers/i2c/busses/i2c-hix5hd2.c b/drivers/i2c/busses/i2c-hix5hd2.c new file mode 100644 index 000000000000..9490d0f4255c --- /dev/null +++ b/drivers/i2c/busses/i2c-hix5hd2.c @@ -0,0 +1,557 @@ +/* + * Copyright (c) 2014 Linaro Ltd. + * Copyright (c) 2014 Hisilicon Limited. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Now only support 7 bit address. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + +/* Register Map */ +#define HIX5I2C_CTRL 0x00 +#define HIX5I2C_COM 0x04 +#define HIX5I2C_ICR 0x08 +#define HIX5I2C_SR 0x0c +#define HIX5I2C_SCL_H 0x10 +#define HIX5I2C_SCL_L 0x14 +#define HIX5I2C_TXR 0x18 +#define HIX5I2C_RXR 0x1c + +/* I2C_CTRL_REG */ +#define I2C_ENABLE BIT(8) +#define I2C_UNMASK_TOTAL BIT(7) +#define I2C_UNMASK_START BIT(6) +#define I2C_UNMASK_END BIT(5) +#define I2C_UNMASK_SEND BIT(4) +#define I2C_UNMASK_RECEIVE BIT(3) +#define I2C_UNMASK_ACK BIT(2) +#define I2C_UNMASK_ARBITRATE BIT(1) +#define I2C_UNMASK_OVER BIT(0) +#define I2C_UNMASK_ALL (I2C_UNMASK_ACK | I2C_UNMASK_OVER) + +/* I2C_COM_REG */ +#define I2C_NO_ACK BIT(4) +#define I2C_START BIT(3) +#define I2C_READ BIT(2) +#define I2C_WRITE BIT(1) +#define I2C_STOP BIT(0) + +/* I2C_ICR_REG */ +#define I2C_CLEAR_START BIT(6) +#define I2C_CLEAR_END BIT(5) +#define I2C_CLEAR_SEND BIT(4) +#define I2C_CLEAR_RECEIVE BIT(3) +#define I2C_CLEAR_ACK BIT(2) +#define I2C_CLEAR_ARBITRATE BIT(1) +#define I2C_CLEAR_OVER BIT(0) +#define I2C_CLEAR_ALL (I2C_CLEAR_START | I2C_CLEAR_END | \ + I2C_CLEAR_SEND | I2C_CLEAR_RECEIVE | \ + I2C_CLEAR_ACK | I2C_CLEAR_ARBITRATE | \ + I2C_CLEAR_OVER) + +/* I2C_SR_REG */ +#define I2C_BUSY BIT(7) +#define I2C_START_INTR BIT(6) +#define I2C_END_INTR BIT(5) +#define I2C_SEND_INTR BIT(4) +#define I2C_RECEIVE_INTR BIT(3) +#define I2C_ACK_INTR BIT(2) +#define I2C_ARBITRATE_INTR BIT(1) +#define I2C_OVER_INTR BIT(0) + +#define HIX5I2C_MAX_FREQ 400000 /* 400k */ +#define HIX5I2C_READ_OPERATION 0x01 + +enum hix5hd2_i2c_state { + HIX5I2C_STAT_RW_ERR = -1, + HIX5I2C_STAT_INIT, + HIX5I2C_STAT_RW, + HIX5I2C_STAT_SND_STOP, + HIX5I2C_STAT_RW_SUCCESS, +}; + +struct hix5hd2_i2c_priv { + struct i2c_adapter adap; + struct i2c_msg *msg; + struct completion msg_complete; + unsigned int msg_idx; + unsigned int msg_len; + int stop; + void __iomem *regs; + struct clk *clk; + struct device *dev; + spinlock_t lock; /* IRQ synchronization */ + int err; + unsigned int freq; + enum hix5hd2_i2c_state state; +}; + +static u32 hix5hd2_i2c_clr_pend_irq(struct hix5hd2_i2c_priv *priv) +{ + u32 val = readl_relaxed(priv->regs + HIX5I2C_SR); + + writel_relaxed(val, priv->regs + HIX5I2C_ICR); + + return val; +} + +static void hix5hd2_i2c_clr_all_irq(struct hix5hd2_i2c_priv *priv) +{ + writel_relaxed(I2C_CLEAR_ALL, priv->regs + HIX5I2C_ICR); +} + +static void hix5hd2_i2c_disable_irq(struct hix5hd2_i2c_priv *priv) +{ + writel_relaxed(0, priv->regs + HIX5I2C_CTRL); +} + +static void hix5hd2_i2c_enable_irq(struct hix5hd2_i2c_priv *priv) +{ + writel_relaxed(I2C_ENABLE | I2C_UNMASK_TOTAL | I2C_UNMASK_ALL, + priv->regs + HIX5I2C_CTRL); +} + +static void hix5hd2_i2c_drv_setrate(struct hix5hd2_i2c_priv *priv) +{ + u32 rate, val; + u32 scl, sysclock; + + /* close all i2c interrupt */ + val = readl_relaxed(priv->regs + HIX5I2C_CTRL); + writel_relaxed(val & (~I2C_UNMASK_TOTAL), priv->regs + HIX5I2C_CTRL); + + rate = priv->freq; + sysclock = clk_get_rate(priv->clk); + scl = (sysclock / (rate * 2)) / 2 - 1; + writel_relaxed(scl, priv->regs + HIX5I2C_SCL_H); + writel_relaxed(scl, priv->regs + HIX5I2C_SCL_L); + + /* restore original interrupt*/ + writel_relaxed(val, priv->regs + HIX5I2C_CTRL); + + dev_dbg(priv->dev, "%s: sysclock=%d, rate=%d, scl=%d\n", + __func__, sysclock, rate, scl); +} + +static void hix5hd2_i2c_init(struct hix5hd2_i2c_priv *priv) +{ + hix5hd2_i2c_disable_irq(priv); + hix5hd2_i2c_drv_setrate(priv); + hix5hd2_i2c_clr_all_irq(priv); + hix5hd2_i2c_enable_irq(priv); +} + +static void hix5hd2_i2c_reset(struct hix5hd2_i2c_priv *priv) +{ + clk_disable_unprepare(priv->clk); + msleep(20); + clk_prepare_enable(priv->clk); + hix5hd2_i2c_init(priv); +} + +static int hix5hd2_i2c_wait_bus_idle(struct hix5hd2_i2c_priv *priv) +{ + unsigned long stop_time; + u32 int_status; + + /* wait for 100 milli seconds for the bus to be idle */ + stop_time = jiffies + msecs_to_jiffies(100); + do { + int_status = hix5hd2_i2c_clr_pend_irq(priv); + if (!(int_status & I2C_BUSY)) + return 0; + + usleep_range(50, 200); + } while (time_before(jiffies, stop_time)); + + return -EBUSY; +} + +static void hix5hd2_rw_over(struct hix5hd2_i2c_priv *priv) +{ + if (priv->state == HIX5I2C_STAT_SND_STOP) + dev_dbg(priv->dev, "%s: rw and send stop over\n", __func__); + else + dev_dbg(priv->dev, "%s: have not data to send\n", __func__); + + priv->state = HIX5I2C_STAT_RW_SUCCESS; + priv->err = 0; +} + +static void hix5hd2_rw_handle_stop(struct hix5hd2_i2c_priv *priv) +{ + if (priv->stop) { + priv->state = HIX5I2C_STAT_SND_STOP; + writel_relaxed(I2C_STOP, priv->regs + HIX5I2C_COM); + } else { + hix5hd2_rw_over(priv); + } +} + +static void hix5hd2_read_handle(struct hix5hd2_i2c_priv *priv) +{ + if (priv->msg_len == 1) { + /* the last byte don't need send ACK */ + writel_relaxed(I2C_READ | I2C_NO_ACK, priv->regs + HIX5I2C_COM); + } else if (priv->msg_len > 1) { + /* if i2c master receive data will send ACK */ + writel_relaxed(I2C_READ, priv->regs + HIX5I2C_COM); + } else { + hix5hd2_rw_handle_stop(priv); + } +} + +static void hix5hd2_write_handle(struct hix5hd2_i2c_priv *priv) +{ + u8 data; + + if (priv->msg_len > 0) { + data = priv->msg->buf[priv->msg_idx++]; + writel_relaxed(data, priv->regs + HIX5I2C_TXR); + writel_relaxed(I2C_WRITE, priv->regs + HIX5I2C_COM); + } else { + hix5hd2_rw_handle_stop(priv); + } +} + +static int hix5hd2_rw_preprocess(struct hix5hd2_i2c_priv *priv) +{ + u8 data; + + if (priv->state == HIX5I2C_STAT_INIT) { + priv->state = HIX5I2C_STAT_RW; + } else if (priv->state == HIX5I2C_STAT_RW) { + if (priv->msg->flags & I2C_M_RD) { + data = readl_relaxed(priv->regs + HIX5I2C_RXR); + priv->msg->buf[priv->msg_idx++] = data; + } + priv->msg_len--; + } else { + dev_dbg(priv->dev, "%s: error: priv->state = %d, msg_len = %d\n", + __func__, priv->state, priv->msg_len); + return -EAGAIN; + } + return 0; +} + +static irqreturn_t hix5hd2_i2c_irq(int irqno, void *dev_id) +{ + struct hix5hd2_i2c_priv *priv = dev_id; + u32 int_status; + int ret; + + spin_lock(&priv->lock); + + int_status = hix5hd2_i2c_clr_pend_irq(priv); + + /* handle error */ + if (int_status & I2C_ARBITRATE_INTR) { + /* bus error */ + dev_dbg(priv->dev, "ARB bus loss\n"); + priv->err = -EAGAIN; + priv->state = HIX5I2C_STAT_RW_ERR; + goto stop; + } else if (int_status & I2C_ACK_INTR) { + /* ack error */ + dev_dbg(priv->dev, "No ACK from device\n"); + priv->err = -ENXIO; + priv->state = HIX5I2C_STAT_RW_ERR; + goto stop; + } + + if (int_status & I2C_OVER_INTR) { + if (priv->msg_len > 0) { + ret = hix5hd2_rw_preprocess(priv); + if (ret) { + priv->err = ret; + priv->state = HIX5I2C_STAT_RW_ERR; + goto stop; + } + if (priv->msg->flags & I2C_M_RD) + hix5hd2_read_handle(priv); + else + hix5hd2_write_handle(priv); + } else { + hix5hd2_rw_over(priv); + } + } + +stop: + if ((priv->state == HIX5I2C_STAT_RW_SUCCESS && + priv->msg->len == priv->msg_idx) || + (priv->state == HIX5I2C_STAT_RW_ERR)) { + hix5hd2_i2c_disable_irq(priv); + hix5hd2_i2c_clr_pend_irq(priv); + complete(&priv->msg_complete); + } + + spin_unlock(&priv->lock); + + return IRQ_HANDLED; +} + +static void hix5hd2_i2c_message_start(struct hix5hd2_i2c_priv *priv, int stop) +{ + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + hix5hd2_i2c_clr_all_irq(priv); + hix5hd2_i2c_enable_irq(priv); + + if (priv->msg->flags & I2C_M_RD) + writel_relaxed((priv->msg->addr << 1) | HIX5I2C_READ_OPERATION, + priv->regs + HIX5I2C_TXR); + else + writel_relaxed(priv->msg->addr << 1, + priv->regs + HIX5I2C_TXR); + + writel_relaxed(I2C_WRITE | I2C_START, priv->regs + HIX5I2C_COM); + spin_unlock_irqrestore(&priv->lock, flags); +} + +static int hix5hd2_i2c_xfer_msg(struct hix5hd2_i2c_priv *priv, + struct i2c_msg *msgs, int stop) +{ + unsigned long timeout; + int ret; + + priv->msg = msgs; + priv->msg_idx = 0; + priv->msg_len = priv->msg->len; + priv->stop = stop; + priv->err = 0; + priv->state = HIX5I2C_STAT_INIT; + + reinit_completion(&priv->msg_complete); + hix5hd2_i2c_message_start(priv, stop); + + timeout = wait_for_completion_timeout(&priv->msg_complete, + priv->adap.timeout); + if (timeout == 0) { + priv->state = HIX5I2C_STAT_RW_ERR; + priv->err = -ETIMEDOUT; + dev_warn(priv->dev, "%s timeout=%d\n", + msgs->flags & I2C_M_RD ? "rx" : "tx", + priv->adap.timeout); + } + ret = priv->state; + + /* + * If this is the last message to be transfered (stop == 1) + * Then check if the bus can be brought back to idle. + */ + if (priv->state == HIX5I2C_STAT_RW_SUCCESS && stop) + ret = hix5hd2_i2c_wait_bus_idle(priv); + + if (ret < 0) + hix5hd2_i2c_reset(priv); + + return priv->err; +} + +static int hix5hd2_i2c_xfer(struct i2c_adapter *adap, + struct i2c_msg *msgs, int num) +{ + struct hix5hd2_i2c_priv *priv = i2c_get_adapdata(adap); + int i, ret, stop; + + pm_runtime_get_sync(priv->dev); + + for (i = 0; i < num; i++, msgs++) { + stop = (i == num - 1); + ret = hix5hd2_i2c_xfer_msg(priv, msgs, stop); + if (ret < 0) + goto out; + } + + if (i == num) { + ret = num; + } else { + /* Only one message, cannot access the device */ + if (i == 1) + ret = -EREMOTEIO; + else + ret = i; + + dev_warn(priv->dev, "xfer message failed\n"); + } + +out: + pm_runtime_mark_last_busy(priv->dev); + pm_runtime_put_autosuspend(priv->dev); + return ret; +} + +static u32 hix5hd2_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); +} + +static const struct i2c_algorithm hix5hd2_i2c_algorithm = { + .master_xfer = hix5hd2_i2c_xfer, + .functionality = hix5hd2_i2c_func, +}; + +static int hix5hd2_i2c_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct hix5hd2_i2c_priv *priv; + struct resource *mem; + unsigned int freq; + int irq, ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + if (of_property_read_u32(np, "clock-frequency", &freq)) { + /* use 100k as default value */ + priv->freq = 100000; + } else { + if (freq > HIX5I2C_MAX_FREQ) { + priv->freq = HIX5I2C_MAX_FREQ; + dev_warn(priv->dev, "use max freq %d instead\n", + HIX5I2C_MAX_FREQ); + } else { + priv->freq = freq; + } + } + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->regs = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) { + dev_err(&pdev->dev, "cannot find HS-I2C IRQ\n"); + return irq; + } + + priv->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(priv->clk)) { + dev_err(&pdev->dev, "cannot get clock\n"); + return PTR_ERR(priv->clk); + } + clk_prepare_enable(priv->clk); + + strlcpy(priv->adap.name, "hix5hd2-i2c", sizeof(priv->adap.name)); + priv->dev = &pdev->dev; + priv->adap.owner = THIS_MODULE; + priv->adap.algo = &hix5hd2_i2c_algorithm; + priv->adap.retries = 3; + priv->adap.dev.of_node = np; + priv->adap.algo_data = priv; + priv->adap.dev.parent = &pdev->dev; + i2c_set_adapdata(&priv->adap, priv); + platform_set_drvdata(pdev, priv); + spin_lock_init(&priv->lock); + init_completion(&priv->msg_complete); + + hix5hd2_i2c_init(priv); + + ret = devm_request_irq(&pdev->dev, irq, hix5hd2_i2c_irq, + IRQF_NO_SUSPEND | IRQF_ONESHOT, + dev_name(&pdev->dev), priv); + if (ret != 0) { + dev_err(&pdev->dev, "cannot request HS-I2C IRQ %d\n", irq); + goto err_clk; + } + + pm_suspend_ignore_children(&pdev->dev, true); + pm_runtime_set_autosuspend_delay(priv->dev, MSEC_PER_SEC); + pm_runtime_use_autosuspend(priv->dev); + pm_runtime_set_active(priv->dev); + pm_runtime_enable(priv->dev); + + ret = i2c_add_adapter(&priv->adap); + if (ret < 0) { + dev_err(&pdev->dev, "failed to add bus to i2c core\n"); + goto err_runtime; + } + + return ret; + +err_runtime: + pm_runtime_disable(priv->dev); + pm_runtime_set_suspended(priv->dev); +err_clk: + clk_disable_unprepare(priv->clk); + return ret; +} + +static int hix5hd2_i2c_remove(struct platform_device *pdev) +{ + struct hix5hd2_i2c_priv *priv = platform_get_drvdata(pdev); + + i2c_del_adapter(&priv->adap); + pm_runtime_disable(priv->dev); + pm_runtime_set_suspended(priv->dev); + + return 0; +} + +#ifdef CONFIG_PM +static int hix5hd2_i2c_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct hix5hd2_i2c_priv *priv = platform_get_drvdata(pdev); + + clk_disable_unprepare(priv->clk); + + return 0; +} + +static int hix5hd2_i2c_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct hix5hd2_i2c_priv *priv = platform_get_drvdata(pdev); + + clk_prepare_enable(priv->clk); + hix5hd2_i2c_init(priv); + + return 0; +} +#endif + +static const struct dev_pm_ops hix5hd2_i2c_pm_ops = { + SET_PM_RUNTIME_PM_OPS(hix5hd2_i2c_runtime_suspend, + hix5hd2_i2c_runtime_resume, + NULL) +}; + +static const struct of_device_id hix5hd2_i2c_match[] = { + { .compatible = "hisilicon,hix5hd2-i2c" }, + {}, +}; +MODULE_DEVICE_TABLE(of, hix5hd2_i2c_match); + +static struct platform_driver hix5hd2_i2c_driver = { + .probe = hix5hd2_i2c_probe, + .remove = hix5hd2_i2c_remove, + .driver = { + .name = "hix5hd2-i2c", + .pm = &hix5hd2_i2c_pm_ops, + .of_match_table = hix5hd2_i2c_match, + }, +}; + +module_platform_driver(hix5hd2_i2c_driver); + +MODULE_DESCRIPTION("Hix5hd2 I2C Bus driver"); +MODULE_AUTHOR("Wei Yan <sledge.yanwei@huawei.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:i2c-hix5hd2"); diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index 10467a327749..7cfc183b3d63 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -62,6 +62,7 @@ * Wildcat Point (PCH) 0x8ca2 32 hard yes yes yes * Wildcat Point-LP (PCH) 0x9ca2 32 hard yes yes yes * BayTrail (SOC) 0x0f12 32 hard yes yes yes + * Sunrise Point-H (PCH) 0xa123 32 hard yes yes yes * * Features supported by this driver: * Software PEC no @@ -184,6 +185,7 @@ #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2 0x8d7f #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS 0x9c22 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS 0x9ca2 +#define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS 0xa123 struct i801_mux_config { char *gpio_chip; @@ -830,6 +832,7 @@ static const struct pci_device_id i801_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS) }, { 0, } }; diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 613069bc561a..c48e46af670a 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -268,6 +268,14 @@ static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy) while (1) { temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); + + /* check for arbitration lost */ + if (temp & I2SR_IAL) { + temp &= ~I2SR_IAL; + imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); + return -EAGAIN; + } + if (for_busy && (temp & I2SR_IBB)) break; if (!for_busy && !(temp & I2SR_IBB)) @@ -702,7 +710,7 @@ static int i2c_imx_probe(struct platform_device *pdev) pdev->name, i2c_imx); if (ret) { dev_err(&pdev->dev, "can't claim irq %d\n", irq); - return ret; + goto clk_disable; } /* Init queue */ @@ -727,7 +735,7 @@ static int i2c_imx_probe(struct platform_device *pdev) ret = i2c_add_numbered_adapter(&i2c_imx->adapter); if (ret < 0) { dev_err(&pdev->dev, "registration failed\n"); - return ret; + goto clk_disable; } /* Set up platform driver data */ @@ -741,6 +749,10 @@ static int i2c_imx_probe(struct platform_device *pdev) dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n"); return 0; /* Return OK */ + +clk_disable: + clk_disable_unprepare(i2c_imx->clk); + return ret; } static int i2c_imx_remove(struct platform_device *pdev) diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c index d9ee43c80cde..3f6ecbfb9a56 100644 --- a/drivers/i2c/busses/i2c-ismt.c +++ b/drivers/i2c/busses/i2c-ismt.c @@ -81,7 +81,7 @@ #define PCI_DEVICE_ID_INTEL_S1200_SMT1 0x0c5a #define PCI_DEVICE_ID_INTEL_AVOTON_SMT 0x1f15 -#define ISMT_DESC_ENTRIES 32 /* number of descriptor entries */ +#define ISMT_DESC_ENTRIES 2 /* number of descriptor entries */ #define ISMT_MAX_RETRIES 3 /* number of SMBus retries to attempt */ /* Hardware Descriptor Constants - Control Field */ diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c index 65a21fed08b5..07e1be6f8992 100644 --- a/drivers/i2c/busses/i2c-mxs.c +++ b/drivers/i2c/busses/i2c-mxs.c @@ -307,6 +307,9 @@ static int mxs_i2c_pio_wait_xfer_end(struct mxs_i2c_dev *i2c) unsigned long timeout = jiffies + msecs_to_jiffies(1000); while (readl(i2c->regs + MXS_I2C_CTRL0) & MXS_I2C_CTRL0_RUN) { + if (readl(i2c->regs + MXS_I2C_CTRL1) & + MXS_I2C_CTRL1_NO_SLAVE_ACK_IRQ) + return -ENXIO; if (time_after(jiffies, timeout)) return -ETIMEDOUT; cond_resched(); diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index e506fcd3ca04..d826e82dd997 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -195,7 +195,7 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, */ rate = clk_get_rate(priv->clk); cdf = rate / 20000000; - if (cdf >= 1 << cdf_width) { + if (cdf >= 1U << cdf_width) { dev_err(dev, "Input clock %lu too high\n", rate); return -EIO; } @@ -245,7 +245,7 @@ scgd_find: return 0; } -static int rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv) +static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv) { int read = !!rcar_i2c_is_recv(priv); @@ -253,8 +253,6 @@ static int rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv) rcar_i2c_write(priv, ICMSR, 0); rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND); - - return 0; } /* @@ -365,6 +363,7 @@ static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr) static irqreturn_t rcar_i2c_irq(int irq, void *ptr) { struct rcar_i2c_priv *priv = ptr; + irqreturn_t result = IRQ_HANDLED; u32 msr; /*-------------- spin lock -----------------*/ @@ -374,6 +373,10 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr) /* Only handle interrupts that are currently enabled */ msr &= rcar_i2c_read(priv, ICMIER); + if (!msr) { + result = IRQ_NONE; + goto exit; + } /* Arbitration lost */ if (msr & MAL) { @@ -408,10 +411,11 @@ out: wake_up(&priv->wait); } +exit: spin_unlock(&priv->lock); /*-------------- spin unlock -----------------*/ - return IRQ_HANDLED; + return result; } static int rcar_i2c_master_xfer(struct i2c_adapter *adap, @@ -453,17 +457,14 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, priv->msg = &msgs[i]; priv->pos = 0; priv->flags = 0; - if (priv->msg == &msgs[num - 1]) + if (i == num - 1) rcar_i2c_flags_set(priv, ID_LAST_MSG); - ret = rcar_i2c_prepare_msg(priv); + rcar_i2c_prepare_msg(priv); spin_unlock_irqrestore(&priv->lock, flags); /*-------------- spin unlock -----------------*/ - if (ret < 0) - break; - timeout = wait_event_timeout(priv->wait, rcar_i2c_flags_has(priv, ID_DONE), 5 * HZ); diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index b38b0529946a..f486d0eac4d0 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -208,7 +208,7 @@ static void rk3x_i2c_prepare_read(struct rk3x_i2c *i2c) * The hw can read up to 32 bytes at a time. If we need more than one * chunk, send an ACK after the last byte of the current chunk. */ - if (unlikely(len > 32)) { + if (len > 32) { len = 32; con &= ~REG_CON_LASTACK; } else { @@ -403,7 +403,7 @@ static irqreturn_t rk3x_i2c_irq(int irqno, void *dev_id) } /* is there anything left to handle? */ - if (unlikely((ipd & REG_INT_ALL) == 0)) + if ((ipd & REG_INT_ALL) == 0) goto out; switch (i2c->state) { |