diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/Kconfig | 175 | ||||
| -rw-r--r-- | drivers/i2c/Makefile | 2 | ||||
| -rw-r--r-- | drivers/i2c/designware_i2c.c | 44 | ||||
| -rw-r--r-- | drivers/i2c/designware_i2c_pci.c | 2 | ||||
| -rw-r--r-- | drivers/i2c/imx_lpi2c.c | 4 | ||||
| -rw-r--r-- | drivers/i2c/k1_i2c.c | 523 | ||||
| -rw-r--r-- | drivers/i2c/k1_i2c.h | 69 | ||||
| -rw-r--r-- | drivers/i2c/muxes/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/i2c/nx_i2c.c | 9 | ||||
| -rw-r--r-- | drivers/i2c/soft_i2c.c | 418 |
10 files changed, 726 insertions, 526 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 55465dc1d46..0e8b2408376 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -98,7 +98,7 @@ config SYS_I2C_EARLY_INIT board_early_init_f. config I2C_CROS_EC_TUNNEL - tristate "Chrome OS EC tunnel I2C bus" + bool "Chrome OS EC tunnel I2C bus" depends on CROS_EC help This provides an I2C bus that will tunnel i2c commands through to @@ -110,16 +110,16 @@ config I2C_CROS_EC_TUNNEL config I2C_CROS_EC_LDO bool "Provide access to LDOs on the Chrome OS EC" depends on CROS_EC - ---help--- - On many Chromebooks the main PMIC is inaccessible to the AP. This is - often dealt with by using an I2C pass-through interface provided by - the EC. On some unfortunate models (e.g. Spring) the pass-through - is not available, and an LDO message is available instead. This - option enables a driver which provides very basic access to those - regulators, via the EC. We implement this as an I2C bus which - emulates just the TPS65090 messages we know about. This is done to - avoid duplicating the logic in the TPS65090 regulator driver for - enabling/disabling an LDO. + help + On many Chromebooks the main PMIC is inaccessible to the AP. This is + often dealt with by using an I2C pass-through interface provided by + the EC. On some unfortunate models (e.g. Spring) the pass-through + is not available, and an LDO message is available instead. This + option enables a driver which provides very basic access to those + regulators, via the EC. We implement this as an I2C bus which + emulates just the TPS65090 messages we know about. This is done to + avoid duplicating the logic in the TPS65090 regulator driver for + enabling/disabling an LDO. config I2C_SET_DEFAULT_BUS_NUM bool "Set default I2C bus number" @@ -180,9 +180,9 @@ config SYS_I2C_IPROC Say yes here to to enable the Broadco I2C driver. config SYS_I2C_FSL - bool "Freescale I2C bus driver" - depends on M68K || PPC - help + bool "Freescale I2C bus driver" + depends on M68K || PPC + help Add support for Freescale I2C busses as used on MPC8240, MPC8245, and MPC85xx processors. @@ -213,14 +213,14 @@ config SYS_FSL_I2C4_OFFSET endif config SYS_I2C_CADENCE - tristate "Cadence I2C Controller" + bool "Cadence I2C Controller" depends on DM_I2C help Say yes here to select Cadence I2C Host Controller. This controller is e.g. used by Xilinx Zynq. config SYS_I2C_CA - tristate "Cortina-Access I2C Controller" + bool "Cortina-Access I2C Controller" depends on DM_I2C && CORTINA_PLATFORM help Add support for the Cortina Access I2C host controller. @@ -249,14 +249,14 @@ config SYS_I2C_DW_PCI controller. config SYS_I2C_AST2600 - bool "AST2600 I2C Controller" - depends on DM_I2C && ARCH_ASPEED - help - Say yes here to select AST2600 I2C Host Controller. The driver - support AST2600 I2C new mode register. This I2C controller supports: - _Standard-mode (up to 100 kHz) - _Fast-mode (up to 400 kHz) - _Fast-mode Plus (up to 1 MHz) + bool "AST2600 I2C Controller" + depends on DM_I2C && ARCH_ASPEED + help + Say yes here to select AST2600 I2C Host Controller. The driver + support AST2600 I2C new mode register. This I2C controller supports: + _Standard-mode (up to 100 kHz) + _Fast-mode (up to 400 kHz) + _Fast-mode Plus (up to 1 MHz) config SYS_I2C_ASPEED bool "Aspeed I2C Controller" @@ -333,50 +333,50 @@ if SYS_I2C_MXC && (SYS_I2C_LEGACY || SPL_SYS_I2C_LEGACY) config SYS_I2C_MXC_I2C1 bool "NXP MXC I2C1" help - Add support for NXP MXC I2C Controller 1. - Required for SoCs which have I2C MXC controller 1 eg LS1088A, LS2080A + Add support for NXP MXC I2C Controller 1. + Required for SoCs which have I2C MXC controller 1 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C2 bool "NXP MXC I2C2" help - Add support for NXP MXC I2C Controller 2. - Required for SoCs which have I2C MXC controller 2 eg LS1088A, LS2080A + Add support for NXP MXC I2C Controller 2. + Required for SoCs which have I2C MXC controller 2 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C3 bool "NXP MXC I2C3" help - Add support for NXP MXC I2C Controller 3. - Required for SoCs which have I2C MXC controller 3 eg LS1088A, LS2080A + Add support for NXP MXC I2C Controller 3. + Required for SoCs which have I2C MXC controller 3 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C4 bool "NXP MXC I2C4" help - Add support for NXP MXC I2C Controller 4. - Required for SoCs which have I2C MXC controller 4 eg LS1088A, LS2080A + Add support for NXP MXC I2C Controller 4. + Required for SoCs which have I2C MXC controller 4 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C5 bool "NXP MXC I2C5" help - Add support for NXP MXC I2C Controller 5. - Required for SoCs which have I2C MXC controller 5 eg LX2160A + Add support for NXP MXC I2C Controller 5. + Required for SoCs which have I2C MXC controller 5 eg LX2160A config SYS_I2C_MXC_I2C6 bool "NXP MXC I2C6" help - Add support for NXP MXC I2C Controller 6. - Required for SoCs which have I2C MXC controller 6 eg LX2160A + Add support for NXP MXC I2C Controller 6. + Required for SoCs which have I2C MXC controller 6 eg LX2160A config SYS_I2C_MXC_I2C7 bool "NXP MXC I2C7" help - Add support for NXP MXC I2C Controller 7. - Required for SoCs which have I2C MXC controller 7 eg LX2160A + Add support for NXP MXC I2C Controller 7. + Required for SoCs which have I2C MXC controller 7 eg LX2160A config SYS_I2C_MXC_I2C8 bool "NXP MXC I2C8" help - Add support for NXP MXC I2C Controller 8. - Required for SoCs which have I2C MXC controller 8 eg LX2160A + Add support for NXP MXC I2C Controller 8. + Required for SoCs which have I2C MXC controller 8 eg LX2160A endif if SYS_I2C_MXC_I2C1 @@ -385,13 +385,13 @@ config SYS_MXC_I2C1_SPEED default 40000000 if TARGET_LS2080A_EMU default 100000 help - MXC I2C Channel 1 speed + MXC I2C Channel 1 speed config SYS_MXC_I2C1_SLAVE hex "I2C1 Slave" default 0x0 help - MXC I2C1 Slave + MXC I2C1 Slave endif if SYS_I2C_MXC_I2C2 @@ -400,13 +400,13 @@ config SYS_MXC_I2C2_SPEED default 40000000 if TARGET_LS2080A_EMU default 100000 help - MXC I2C Channel 2 speed + MXC I2C Channel 2 speed config SYS_MXC_I2C2_SLAVE hex "I2C2 Slave" default 0x0 help - MXC I2C2 Slave + MXC I2C2 Slave endif if SYS_I2C_MXC_I2C3 @@ -414,13 +414,13 @@ config SYS_MXC_I2C3_SPEED int "I2C Channel 3 speed" default 100000 help - MXC I2C Channel 3 speed + MXC I2C Channel 3 speed config SYS_MXC_I2C3_SLAVE hex "I2C3 Slave" default 0x0 help - MXC I2C3 Slave + MXC I2C3 Slave endif if SYS_I2C_MXC_I2C4 @@ -428,13 +428,13 @@ config SYS_MXC_I2C4_SPEED int "I2C Channel 4 speed" default 100000 help - MXC I2C Channel 4 speed + MXC I2C Channel 4 speed config SYS_MXC_I2C4_SLAVE hex "I2C4 Slave" default 0x0 help - MXC I2C4 Slave + MXC I2C4 Slave endif if SYS_I2C_MXC_I2C5 @@ -442,13 +442,13 @@ config SYS_MXC_I2C5_SPEED int "I2C Channel 5 speed" default 100000 help - MXC I2C Channel 5 speed + MXC I2C Channel 5 speed config SYS_MXC_I2C5_SLAVE hex "I2C5 Slave" default 0x0 help - MXC I2C5 Slave + MXC I2C5 Slave endif if SYS_I2C_MXC_I2C6 @@ -456,13 +456,13 @@ config SYS_MXC_I2C6_SPEED int "I2C Channel 6 speed" default 100000 help - MXC I2C Channel 6 speed + MXC I2C Channel 6 speed config SYS_MXC_I2C6_SLAVE hex "I2C6 Slave" default 0x0 help - MXC I2C6 Slave + MXC I2C6 Slave endif if SYS_I2C_MXC_I2C7 @@ -470,13 +470,13 @@ config SYS_MXC_I2C7_SPEED int "I2C Channel 7 speed" default 100000 help - MXC I2C Channel 7 speed + MXC I2C Channel 7 speed config SYS_MXC_I2C7_SLAVE hex "I2C7 Slave" default 0x0 help - MXC I2C7 Slave + MXC I2C7 Slave endif if SYS_I2C_MXC_I2C8 @@ -484,13 +484,13 @@ config SYS_MXC_I2C8_SPEED int "I2C Channel 8 speed" default 100000 help - MXC I2C Channel 8 speed + MXC I2C Channel 8 speed config SYS_MXC_I2C8_SLAVE hex "I2C8 Slave" default 0x0 help - MXC I2C8 Slave + MXC I2C8 Slave endif config SYS_I2C_NEXELL @@ -624,26 +624,6 @@ config SH_I2C_CLOCK default 104000000 endif -config SYS_I2C_SOFT - bool "Legacy software I2C interface" - depends on !COMPILE_TEST - help - Enable the legacy software defined I2C interface - -config SYS_I2C_SOFT_SPEED - int "Software I2C bus speed" - depends on SYS_I2C_SOFT - default 100000 - help - Speed of the software I2C bus - -config SYS_I2C_SOFT_SLAVE - hex "Software I2C slave address" - depends on SYS_I2C_SOFT - default 0xfe - help - Slave address of the software I2C bus - config SYS_I2C_OCTEON bool "Octeon II/III/TX/TX2 I2C driver" depends on (ARCH_OCTEON || ARCH_OCTEONTX || ARCH_OCTEONTX2) && DM_I2C @@ -688,19 +668,19 @@ config SYS_I2C_STM32F7 help Enable this option to add support for STM32 I2C controller introduced with STM32F7/H7 SoCs. This I2C controller supports : - _ Slave and master modes - _ Multimaster capability - _ Standard-mode (up to 100 kHz) - _ Fast-mode (up to 400 kHz) - _ Fast-mode Plus (up to 1 MHz) - _ 7-bit and 10-bit addressing mode - _ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask) - _ All 7-bit addresses acknowledge mode - _ General call - _ Programmable setup and hold times - _ Easy to use event management - _ Optional clock stretching - _ Software reset + _ Slave and master modes + _ Multimaster capability + _ Standard-mode (up to 100 kHz) + _ Fast-mode (up to 400 kHz) + _ Fast-mode Plus (up to 1 MHz) + _ 7-bit and 10-bit addressing mode + _ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask) + _ All 7-bit addresses acknowledge mode + _ General call + _ Programmable setup and hold times + _ Easy to use event management + _ Optional clock stretching + _ Software reset config SYS_I2C_SUN6I_P2WI bool "Allwinner sun6i P2WI controller" @@ -800,7 +780,7 @@ config SYS_I2C_BUS_MAX int "Max I2C busses" depends on ARCH_OMAP2PLUS || ARCH_SOCFPGA default 3 if OMAP34XX || AM33XX || AM43XX - default 4 if ARCH_SOCFPGA + default 4 if ARCH_SOCFPGA || OMAP44XX default 5 if OMAP54XX help Define the maximum number of available I2C buses. @@ -812,10 +792,17 @@ config SYS_I2C_XILINX_XIIC Support for Xilinx AXI I2C controller. config SYS_I2C_IHS - bool "gdsys IHS I2C driver" - depends on DM_I2C - help - Support for gdsys IHS I2C driver on FPGA bus. + bool "gdsys IHS I2C driver" + depends on DM_I2C + help + Support for gdsys IHS I2C driver on FPGA bus. + +config SYS_I2C_SPACEMIT_K1 + bool "Spacemit K1 I2C driver" + depends on DM_I2C + help + Support for Spacemit I2C controller. It's based on + Driver Model. source "drivers/i2c/muxes/Kconfig" diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 5fe30d0df4f..0e3a0f9fb5f 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -47,7 +47,7 @@ obj-$(CONFIG_SYS_I2C_RZ_RIIC) += rz_riic.o obj-$(CONFIG_SYS_I2C_S3C24X0) += s3c24x0_i2c.o exynos_hs_i2c.o obj-$(CONFIG_SYS_I2C_SANDBOX) += sandbox_i2c.o i2c-emul-uclass.o obj-$(CONFIG_SYS_I2C_SH) += sh_i2c.o -obj-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o +obj-$(CONFIG_SYS_I2C_SPACEMIT_K1) += k1_i2c.o obj-$(CONFIG_SYS_I2C_STM32F7) += stm32f7_i2c.o obj-$(CONFIG_SYS_I2C_SUN6I_P2WI) += sun6i_p2wi.o obj-$(CONFIG_SYS_I2C_SUN8I_RSB) += sun8i_rsb.o diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index 8ad716f410e..8d290acefda 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -740,13 +740,47 @@ static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr, { struct dw_i2c *i2c = dev_get_priv(bus); struct i2c_regs *i2c_base = i2c->regs; - u32 tmp; - int ret; + u32 start_time, ic_status; + int ret = 0; - /* Try to read the first location of the chip */ - ret = __dw_i2c_read(i2c_base, chip_addr, 0, 1, (uchar *)&tmp, 1); + ret = i2c_wait_for_bb(i2c_base); if (ret) - __dw_i2c_init(i2c_base, 0, 0); + return ret; + + dw_i2c_enable(i2c_base, false); + writel(chip_addr, &i2c_base->ic_tar); + dw_i2c_enable(i2c_base, true); + + writel(IC_STOP, &i2c_base->ic_cmd_data); + + start_time = get_timer(0); + while (1) { + ic_status = readl(&i2c_base->ic_status); + + if ((ic_status & IC_STATUS_TFE) && !(ic_status & IC_STATUS_MA)) + break; + + if (readl(&i2c_base->ic_raw_intr_stat) & IC_TX_ABRT) { + readl(&i2c_base->ic_clr_tx_abrt); + ret = -EREMOTEIO; + break; + } + + if (get_timer(start_time) > I2C_BYTE_TO) { + ret = -ETIMEDOUT; + break; + } + } + + start_time = get_timer(0); + while (1) { + if ((readl(&i2c_base->ic_raw_intr_stat) & IC_STOP_DET)) { + readl(&i2c_base->ic_clr_stop_det); + break; + } else if (get_timer(start_time) > I2C_STOPDET_TO) { + break; + } + } return ret; } diff --git a/drivers/i2c/designware_i2c_pci.c b/drivers/i2c/designware_i2c_pci.c index c21c412231c..db2706fdb6e 100644 --- a/drivers/i2c/designware_i2c_pci.c +++ b/drivers/i2c/designware_i2c_pci.c @@ -168,7 +168,7 @@ static int dw_i2c_acpi_fill_ssdt(const struct udevice *dev, return 0; } -struct acpi_ops dw_i2c_acpi_ops = { +static const struct acpi_ops dw_i2c_acpi_ops = { .fill_ssdt = dw_i2c_acpi_fill_ssdt, }; diff --git a/drivers/i2c/imx_lpi2c.c b/drivers/i2c/imx_lpi2c.c index a309fd6f07c..e2b4fd334ec 100644 --- a/drivers/i2c/imx_lpi2c.c +++ b/drivers/i2c/imx_lpi2c.c @@ -239,7 +239,6 @@ static int bus_i2c_stop(struct udevice *bus) start_time = get_timer(0); while (1) { status = readl(®s->msr); - result = imx_lpci2c_check_clear_error(regs); /* stop detect flag */ if (status & LPI2C_MSR_SDF_MASK) { /* clear stop flag */ @@ -250,10 +249,13 @@ static int bus_i2c_stop(struct udevice *bus) if (get_timer(start_time) > LPI2C_NACK_TOUT_MS) { debug("stop timeout\n"); + result = imx_lpci2c_check_clear_error(regs); return -ETIMEDOUT; } } + result = imx_lpci2c_check_clear_error(regs); + return result; } diff --git a/drivers/i2c/k1_i2c.c b/drivers/i2c/k1_i2c.c new file mode 100644 index 00000000000..a08ff15803d --- /dev/null +++ b/drivers/i2c/k1_i2c.c @@ -0,0 +1,523 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2023-2026 Spacemit, Inc + * Copyright (C) 2025-2026 RISCstar Ltd. + */ + +#include <asm/io.h> +#include <clk.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <i2c.h> +#include <linux/delay.h> +#include <linux/iopoll.h> +#include <reset.h> +#include "k1_i2c.h" + +#define ICR_OFFSET 0x00 +#define ISR_OFFSET 0x04 +#define ISAR_OFFSET 0x08 +#define IDBR_OFFSET 0x0c +#define ILCR_OFFSET 0x10 +#define IWCR_OFFSET 0x14 +#define IRCR_OFFSET 0x18 +#define IBMR_OFFSET 0x1c +#define WFIFO_OFFSET 0x20 +#define WFIFO_WPTR_OFFSET 0x24 +#define WFIFO_RPTR_OFFSET 0x28 +#define RFIFO_OFFSET 0x2c +#define RFIFO_WPTR_OFFSET 0x30 +#define RFIFO_RPTR_OFFSET 0x34 + +/* All transfers are described by this data structure */ +struct k1_i2c_msg { + u8 condition; + u8 acknack; + u8 direction; + u8 data; +}; + +struct k1_i2c { + u32 icr; + u32 isr; + u32 isar; + u32 idbr; + u32 ilcr; + u32 iwcr; + u32 irst_cyc; + u32 ibmr; +}; + +struct k1_i2c_priv { + int id; + void __iomem *base; + struct clk clk; + u32 clk_rate; +}; + +/* + * i2c_reset: - reset the host controller + * + */ +static void i2c_reset(void __iomem *base) +{ + u32 icr_mode; + u32 val; + + /* Save bus mode (standard or fast speed) for later use */ + icr_mode = readl(base + ICR_OFFSET) & ICR_MODE_MASK; + /* disable unit */ + val = readl(base + ICR_OFFSET); + writel(val & ~ICR_IUE, base + ICR_OFFSET); + udelay(10); + /* reset the unit */ + val = readl(base + ICR_OFFSET); + val |= ICR_UR; + writel(val, base + ICR_OFFSET); + udelay(100); + /* disable unit */ + val = readl(base + ICR_OFFSET); + writel(val & ~ICR_IUE, base + ICR_OFFSET); + + /* set slave address */ + writel(0x00, base + ISR_OFFSET); + /* set control reg values */ + writel(I2C_ICR_INIT | icr_mode, base + ICR_OFFSET); + writel(I2C_ISR_INIT, base + ISR_OFFSET); /* set clear interrupt bits */ + val = readl(base + ICR_OFFSET); + val |= ICR_IUE; + writel(val, base + ICR_OFFSET); /* enable unit */ + udelay(100); +} + +static inline bool is_isr_set_or_clr(unsigned long isr, unsigned long set_mask, + unsigned long clr_mask) +{ + return ((isr & set_mask) == set_mask) && ((isr & clr_mask) == 0); +} + +/* + * i2c_isr_set_cleared: - wait until certain bits of the I2C status register + * are set and cleared + * + * @return: 0 on success or -ETIMEDOUT. + */ +static int i2c_isr_set_cleared(void __iomem *base, unsigned long set_mask, + unsigned long clr_mask) +{ + int cnt = 1000, delay = 10, isr, ret; + + ret = read_poll_timeout(readl, isr, + is_isr_set_or_clr(isr, set_mask, clr_mask), + delay, delay * cnt, base + ISR_OFFSET); + return ret; +} + +/* + * i2c_transfer: - Transfer one byte over the i2c bus + * + * This function can transfer a byte over the i2c bus in both directions. + * It is used by the public API functions. + * + * @return: 0: transfer successful or error code + */ +static int i2c_transfer(void __iomem *base, struct k1_i2c_msg *msg) +{ + int ret; + u32 val; + + if (!msg) + goto transfer_error_msg_empty; + + switch (msg->direction) { + case I2C_WRITE: + /* check if bus is not busy */ + if (i2c_isr_set_cleared(base, 0, ISR_IBB)) + goto transfer_error_bus_busy; + + /* start transmission */ + val = readl(base + ICR_OFFSET); + val &= ~ICR_START; + writel(val, base + ICR_OFFSET); + val = readl(base + ICR_OFFSET); + val &= ~ICR_STOP; + writel(val, base + ICR_OFFSET); + writel(msg->data, base + IDBR_OFFSET); + if (msg->condition == I2C_COND_START) { + val = readl(base + ICR_OFFSET); + val |= ICR_START; + writel(val, base + ICR_OFFSET); + } + if (msg->condition == I2C_COND_STOP) { + val = readl(base + ICR_OFFSET); + val |= ICR_STOP; + writel(val, base + ICR_OFFSET); + } + if (msg->acknack == I2C_ACKNAK_SENDNAK) { + val = readl(base + ICR_OFFSET); + val |= ICR_ACKNAK; + writel(val, base + ICR_OFFSET); + } + if (msg->acknack == I2C_ACKNAK_SENDACK) { + val = readl(base + ICR_OFFSET); + val &= ~ICR_ACKNAK; + writel(val, base + ICR_OFFSET); + } + val = readl(base + ICR_OFFSET); + val &= ~ICR_ALDIE; + writel(val, base + ICR_OFFSET); + val = readl(base + ICR_OFFSET); + val |= ICR_TB; + writel(val, base + ICR_OFFSET); + + /* transmit register empty? */ + if (i2c_isr_set_cleared(base, ISR_ITE, 0)) + goto transfer_error_transmit_timeout; + + /* clear 'transmit empty' state */ + val = readl(base + ISR_OFFSET); + val |= ISR_ITE; + writel(val, base + ISR_OFFSET); + + /* wait for ACK from slave */ + if (msg->acknack == I2C_ACKNAK_WAITACK) + if (i2c_isr_set_cleared(base, 0, ISR_ACKNAK)) + goto transfer_error_ack_missing; + break; + + case I2C_READ: + /* check if bus is not busy */ + if (i2c_isr_set_cleared(base, 0, ISR_IBB)) + goto transfer_error_bus_busy; + + /* start receive */ + val = readl(base + ICR_OFFSET); + val &= ~ICR_START; + writel(val, base + ICR_OFFSET); + val = readl(base + ICR_OFFSET); + val &= ~ICR_STOP; + writel(val, base + ICR_OFFSET); + if (msg->condition == I2C_COND_START) { + val = readl(base + ICR_OFFSET); + val |= ICR_START; + writel(val, base + ICR_OFFSET); + } + if (msg->condition == I2C_COND_STOP) { + val = readl(base + ICR_OFFSET); + val |= ICR_STOP; + writel(val, base + ICR_OFFSET); + } + if (msg->acknack == I2C_ACKNAK_SENDNAK) { + val = readl(base + ICR_OFFSET); + val |= ICR_ACKNAK; + writel(val, base + ICR_OFFSET); + } + if (msg->acknack == I2C_ACKNAK_SENDACK) { + val = readl(base + ICR_OFFSET); + val &= ~ICR_ACKNAK; + writel(val, base + ICR_OFFSET); + } + val = readl(base + ICR_OFFSET); + val &= ~ICR_ALDIE; + writel(val, base + ICR_OFFSET); + val = readl(base + ICR_OFFSET); + val |= ICR_TB; + writel(val, base + ICR_OFFSET); + + /* receive register full? */ + if (i2c_isr_set_cleared(base, ISR_IRF, 0)) + goto transfer_error_receive_timeout; + + msg->data = readl(base + IDBR_OFFSET); + + /* clear 'receive empty' state */ + val = readl(base + ISR_OFFSET); + val |= ISR_IRF; + writel(val, base + ISR_OFFSET); + break; + default: + goto transfer_error_illegal_param; + } + + return 0; + +transfer_error_msg_empty: + debug("%s: error: 'msg' is empty\n", __func__); + ret = -EINVAL; + goto i2c_transfer_finish; + +transfer_error_transmit_timeout: + debug("%s: error: transmit timeout\n", __func__); + ret = -ETIMEDOUT; + goto i2c_transfer_finish; + +transfer_error_ack_missing: + debug("%s: error: ACK missing\n", __func__); + ret = -EREMOTEIO; + goto i2c_transfer_finish; + +transfer_error_receive_timeout: + debug("%s: error: receive timeout\n", __func__); + ret = -ETIMEDOUT; + goto i2c_transfer_finish; + +transfer_error_illegal_param: + debug("%s: error: illegal parameters\n", __func__); + ret = -EINVAL; + goto i2c_transfer_finish; + +transfer_error_bus_busy: + debug("%s: error: bus is busy\n", __func__); + ret = -EIO; + goto i2c_transfer_finish; + +i2c_transfer_finish: + debug("%s: ISR: 0x%04x\n", __func__, readl(base + ISR_OFFSET)); + i2c_reset(base); + return ret; +} + +static int __i2c_read(void __iomem *base, uchar chip, u8 *addr, int alen, + uchar *buffer, int len) +{ + struct k1_i2c_msg msg; + int ret; + + debug("%s(chip=0x%02x, addr=0x%02x, alen=0x%02x, len=0x%02x)\n", + __func__, chip, *addr, alen, len); + + if (len == 0) { + pr_err("reading zero byte is invalid\n"); + return -EINVAL; + } + + i2c_reset(base); + + /* dummy chip address write */ + debug("%s: dummy chip address write\n", __func__); + msg.condition = I2C_COND_START; + msg.acknack = I2C_ACKNAK_WAITACK; + msg.direction = I2C_WRITE; + msg.data = (chip << 1); + msg.data &= 0xFE; + ret = i2c_transfer(base, &msg); + if (ret) + return ret; + + /* + * send memory address bytes; + * alen defines how much bytes we have to send. + */ + while (--alen >= 0) { + debug("%s: send address byte %02x (alen=%d)\n", + __func__, *addr, alen); + msg.condition = I2C_COND_NORMAL; + msg.acknack = I2C_ACKNAK_WAITACK; + msg.direction = I2C_WRITE; + msg.data = addr[alen]; + ret = i2c_transfer(base, &msg); + if (ret) + return ret; + } + + /* start read sequence */ + debug("%s: start read sequence\n", __func__); + msg.condition = I2C_COND_START; + msg.acknack = I2C_ACKNAK_WAITACK; + msg.direction = I2C_WRITE; + msg.data = (chip << 1); + msg.data |= 0x01; + ret = i2c_transfer(base, &msg); + if (ret) + return ret; + + /* read bytes; send NACK at last byte */ + while (len--) { + if (len == 0) { + msg.condition = I2C_COND_STOP; + msg.acknack = I2C_ACKNAK_SENDNAK; + } else { + msg.condition = I2C_COND_NORMAL; + msg.acknack = I2C_ACKNAK_SENDACK; + } + + msg.direction = I2C_READ; + msg.data = 0x00; + ret = i2c_transfer(base, &msg); + if (ret) + return ret; + + *buffer = msg.data; + debug("%s: reading byte (%p)=0x%02x\n", + __func__, buffer, *buffer); + buffer++; + } + + i2c_reset(base); + + return 0; +} + +static int __i2c_write(struct k1_i2c *base, uchar chip, u8 *addr, int alen, + uchar *buffer, int len) +{ + struct k1_i2c_msg msg; + int ret; + + debug("%s(chip=0x%02x, addr=0x%02x, alen=0x%02x, len=0x%02x)\n", + __func__, chip, *addr, alen, len); + + i2c_reset(base); + + /* chip address write */ + debug("%s: chip address write\n", __func__); + msg.condition = I2C_COND_START; + msg.acknack = I2C_ACKNAK_WAITACK; + msg.direction = I2C_WRITE; + msg.data = (chip << 1); + msg.data &= 0xFE; + ret = i2c_transfer(base, &msg); + if (ret) + return ret; + + /* + * send memory address bytes; + * alen defines how much bytes we have to send. + */ + while (--alen >= 0) { + debug("%s: send address byte %02x (alen=%d)\n", + __func__, *addr, alen); + msg.condition = I2C_COND_NORMAL; + msg.acknack = I2C_ACKNAK_WAITACK; + msg.direction = I2C_WRITE; + msg.data = addr[alen]; + ret = i2c_transfer(base, &msg); + if (ret) + return ret; + } + + /* write bytes; send NACK at last byte */ + while (len--) { + debug("%s: writing byte (%p)=0x%02x\n", + __func__, buffer, *buffer); + + if (len == 0) + msg.condition = I2C_COND_STOP; + else + msg.condition = I2C_COND_NORMAL; + + msg.acknack = I2C_ACKNAK_WAITACK; + msg.direction = I2C_WRITE; + msg.data = *(buffer++); + + ret = i2c_transfer(base, &msg); + if (ret) + return ret; + } + + i2c_reset(base); + + return 0; +} + +static int k1_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) +{ + struct k1_i2c_priv *i2c = dev_get_priv(bus); + struct i2c_msg *dmsg, *omsg, dummy; + + memset(&dummy, 0, sizeof(struct i2c_msg)); + + /* + * We expect either two messages (one with an offset and one with the + * actual data) or one message (just data or offset/data combined) + */ + if (nmsgs > 2 || nmsgs == 0) { + debug("%s: Only one or two messages are supported.", __func__); + return -EINVAL; + } + + omsg = nmsgs == 1 ? &dummy : msg; + dmsg = nmsgs == 1 ? msg : msg + 1; + + if (dmsg->flags & I2C_M_RD) + return __i2c_read(i2c->base, dmsg->addr, omsg->buf, + omsg->len, dmsg->buf, dmsg->len); + else + return __i2c_write(i2c->base, dmsg->addr, omsg->buf, + omsg->len, dmsg->buf, dmsg->len); +} + +static int k1_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) +{ + struct k1_i2c_priv *priv = dev_get_priv(bus); + void __iomem *base = priv->base; + u32 val; + + if (speed > I2C_SPEED_STANDARD_RATE) + val = ICR_FM; + else + val = ICR_SM; + clrsetbits_le32(base + ICR_OFFSET, ICR_MODE_MASK, val); + + return 0; +} + +static int k1_i2c_probe(struct udevice *bus) +{ + struct k1_i2c_priv *priv = dev_get_priv(bus); + struct reset_ctl reset; + int ret; + + priv->id = dev_seq(bus); + + /* + * The upstream K1 dts intentionally omits the 'resets' property + * on i2c nodes — the apbc clock-enable path performs the + * controller reset internally as part of clock gating. Treat the + * reset lookup as optional so we work on the kernel-mainline DT. + */ + ret = reset_get_by_index(bus, 0, &reset); + if (!ret) { + reset_assert(&reset); + udelay(10); + reset_deassert(&reset); + udelay(10); + } else if (ret != -ENOENT && ret != -ENODATA) { + dev_err(bus, "%s: reset lookup failed (%d)\n", __func__, ret); + return ret; + } + + ret = clk_get_by_index(bus, 0, &priv->clk); + if (ret) + return ret; + + ret = clk_enable(&priv->clk); + if (ret && ret != -ENOSYS && ret != -EOPNOTSUPP) { + debug("%s: failed to enable clock\n", __func__); + return ret; + } + priv->clk_rate = clk_get_rate(&priv->clk); + + priv->base = (void *)devfdt_get_addr_ptr(bus); + k1_i2c_set_bus_speed(bus, priv->clk_rate); + return 0; +} + +static const struct dm_i2c_ops k1_i2c_ops = { + .xfer = k1_i2c_xfer, + .set_bus_speed = k1_i2c_set_bus_speed, +}; + +static const struct udevice_id k1_i2c_ids[] = { + { .compatible = "spacemit,k1-i2c" }, + { } +}; + +U_BOOT_DRIVER(i2c_spacemit) = { + .name = "i2c_spacemit", + .id = UCLASS_I2C, + .of_match = k1_i2c_ids, + .probe = k1_i2c_probe, + .priv_auto = sizeof(struct k1_i2c_priv), + .ops = &k1_i2c_ops, +}; diff --git a/drivers/i2c/k1_i2c.h b/drivers/i2c/k1_i2c.h new file mode 100644 index 00000000000..856947aa43b --- /dev/null +++ b/drivers/i2c/k1_i2c.h @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2023-2026 Spacemit Ltd. + * Copyright (C) 2025-2026 RISCstar Ltd. + */ + +#ifndef __SPACEMIT_I2C_H +#define __SPACEMIT_I2C_H + +/* Shall the current transfer have a start/stop condition? */ +#define I2C_COND_NORMAL 0 +#define I2C_COND_START 1 +#define I2C_COND_STOP 2 + +/* Shall the current transfer be ack/nacked or being waited for it? */ +#define I2C_ACKNAK_WAITACK 1 +#define I2C_ACKNAK_SENDACK 2 +#define I2C_ACKNAK_SENDNAK 4 + +/* Specify who shall transfer the data (master or slave) */ +#define I2C_READ 0 +#define I2C_WRITE 1 + +#if (CONFIG_SYS_I2C_SPEED == 400000) +#define I2C_ICR_INIT (ICR_FM | ICR_BEIE | ICR_IRFIE | ICR_ITEIE | \ + ICR_GCD | ICR_SCLE) +#else +#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | \ + ICR_SCLE) +#endif + +/* ----- Control register bits ---------------------------------------- */ + +#define ICR_START 0x1 /* start bit */ +#define ICR_STOP 0x2 /* stop bit */ +#define ICR_ACKNAK 0x4 /* send ACK(0) or NAK(1) */ +#define ICR_TB 0x8 /* transfer byte bit */ +#define ICR_MA BIT(12) /* master abort */ +#define ICR_SCLE BIT(13) /* master clock enable, mona SCLEA */ +#define ICR_IUE BIT(14) /* unit enable */ +#define ICR_GCD BIT(21) /* general call disable */ +#define ICR_ITEIE BIT(19) /* enable tx interrupts */ +#define ICR_IRFIE BIT(20) /* enable rx interrupts, mona: DRFIE */ +#define ICR_BEIE BIT(22) /* enable bus error ints */ +#define ICR_SSDIE BIT(24) /* slave STOP detected int enable */ +#define ICR_ALDIE BIT(18) /* enable arbitration interrupt */ +#define ICR_SADIE BIT(23) /* slave address detected int enable */ +#define ICR_UR BIT(10) /* unit reset */ +#define ICR_SM (0x0) /* Standard Mode */ +#define ICR_FM BIT(8) /* Fast Mode */ +#define ICR_MODE_MASK (0x300) /* Mode mask */ + +/* ----- Status register bits ----------------------------------------- */ + +#define ISR_RWM BIT(13) /* read/write mode */ +#define ISR_ACKNAK BIT(14) /* ack/nak status */ +#define ISR_UB BIT(15) /* unit busy */ +#define ISR_IBB BIT(16) /* bus busy */ +#define ISR_SSD BIT(24) /* slave stop detected */ +#define ISR_ALD BIT(18) /* arbitration loss detected */ +#define ISR_ITE BIT(19) /* tx buffer empty */ +#define ISR_IRF BIT(20) /* rx buffer full */ +#define ISR_GCAD BIT(21) /* general call address detected */ +#define ISR_SAD BIT(23) /* slave address detected */ +#define ISR_BED BIT(22) /* bus error no ACK/NAK */ + +#define I2C_ISR_INIT 0x1FDE000 + +#endif diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index 3b1220b2105..89a4b82458a 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -26,14 +26,14 @@ config I2C_ARB_GPIO_CHALLENGE a GPIO. config I2C_MUX_PCA9541 - tristate "NXP PCA9541 I2C Master Selector" + bool "NXP PCA9541 I2C Master Selector" depends on I2C_MUX help If you say yes here you get support for the NXP PCA9541 I2C Master Selector. config I2C_MUX_PCA954x - tristate "TI PCA954x I2C Mux/switches" + bool "TI PCA954x I2C Mux/switches" depends on I2C_MUX help If you say yes here you get support for the TI PCA954x I2C mux/switch @@ -49,7 +49,7 @@ config I2C_MUX_PCA954x MAX7356, MAX7357, MAX7358, MAX7367, MAX7368 and MAX7369 config I2C_MUX_GPIO - tristate "GPIO-based I2C multiplexer" + bool "GPIO-based I2C multiplexer" depends on I2C_MUX && DM_GPIO select DEVRES help diff --git a/drivers/i2c/nx_i2c.c b/drivers/i2c/nx_i2c.c index 706b7adefe8..5800e79ab70 100644 --- a/drivers/i2c/nx_i2c.c +++ b/drivers/i2c/nx_i2c.c @@ -1,3 +1,5 @@ +// SPDX-License-Identifier: GPL-2.0+ + #include <errno.h> #include <dm.h> #include <i2c.h> @@ -230,12 +232,13 @@ static void i2c_process_node(struct udevice *dev) static int nx_i2c_probe(struct udevice *dev) { struct nx_i2c_bus *bus = dev_get_priv(dev); - fdt_addr_t addr; + void __iomem *addr; /* get regs = i2c base address */ - addr = devfdt_get_addr(dev); - if (addr == FDT_ADDR_T_NONE) + addr = dev_read_addr_ptr(dev); + if (!addr) return -EINVAL; + bus->regs = (struct nx_i2c_regs *)addr; bus->bus_num = dev_seq(dev); diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c index 4102375e5b7..e69de29bb2d 100644 --- a/drivers/i2c/soft_i2c.c +++ b/drivers/i2c/soft_i2c.c @@ -1,418 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * (C) Copyright 2009 - * Heiko Schocher, DENX Software Engineering, [email protected]. - * Changes for multibus/multiadapter I2C support. - * - * (C) Copyright 2001, 2002 - * Wolfgang Denk, DENX Software Engineering, [email protected]. - * - * This has been changed substantially by Gerald Van Baren, Custom IDEAS, - * [email protected]. It was heavily influenced by LiMon, written by - * Neil Russell. - * - * NOTE: This driver should be converted to driver model before June 2017. - * Please see doc/driver-model/i2c-howto.rst for instructions. - */ - -#include <config.h> -#if defined(CONFIG_AT91FAMILY) -#include <asm/io.h> -#include <asm/arch/hardware.h> -#include <asm/arch/at91_pio.h> -#ifdef CONFIG_ATMEL_LEGACY -#include <asm/arch/gpio.h> -#endif -#endif -#include <i2c.h> -#include <linux/delay.h> - -#if defined(CONFIG_SOFT_I2C_GPIO_SCL) -# include <asm/gpio.h> - -# ifndef I2C_GPIO_SYNC -# define I2C_GPIO_SYNC -# endif - -# ifndef I2C_INIT -# define I2C_INIT \ - do { \ - gpio_request(CONFIG_SOFT_I2C_GPIO_SCL, "soft_i2c"); \ - gpio_request(CONFIG_SOFT_I2C_GPIO_SDA, "soft_i2c"); \ - } while (0) -# endif - -# ifndef I2C_ACTIVE -# define I2C_ACTIVE do { } while (0) -# endif - -# ifndef I2C_TRISTATE -# define I2C_TRISTATE do { } while (0) -# endif - -# ifndef I2C_READ -# define I2C_READ gpio_get_value(CONFIG_SOFT_I2C_GPIO_SDA) -# endif - -# ifndef I2C_SDA -# define I2C_SDA(bit) \ - do { \ - if (bit) \ - gpio_direction_input(CONFIG_SOFT_I2C_GPIO_SDA); \ - else \ - gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SDA, 0); \ - I2C_GPIO_SYNC; \ - } while (0) -# endif - -# ifndef I2C_SCL -# define I2C_SCL(bit) \ - do { \ - gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SCL, bit); \ - I2C_GPIO_SYNC; \ - } while (0) -# endif - -# ifndef I2C_DELAY -# define I2C_DELAY udelay(5) /* 1/4 I2C clock duration */ -# endif - -#endif - -/* #define DEBUG_I2C */ - -#ifndef I2C_SOFT_DECLARATIONS -# define I2C_SOFT_DECLARATIONS -#endif - -/*----------------------------------------------------------------------- - * Definitions - */ -#define RETRIES 0 - -#define I2C_ACK 0 /* PD_SDA level to ack a byte */ -#define I2C_NOACK 1 /* PD_SDA level to noack a byte */ - -#ifdef DEBUG_I2C -#define PRINTD(fmt,args...) do { \ - printf (fmt ,##args); \ - } while (0) -#else -#define PRINTD(fmt,args...) -#endif - -/*----------------------------------------------------------------------- - * Local functions - */ -static void send_reset (void); -static void send_start (void); -static void send_stop (void); -static void send_ack (int); -static int write_byte (uchar byte); -static uchar read_byte (int); - -/*----------------------------------------------------------------------- - * Send a reset sequence consisting of 9 clocks with the data signal high - * to clock any confused device back into an idle state. Also send a - * <stop> at the end of the sequence for belts & suspenders. - */ -static void send_reset(void) -{ - I2C_SOFT_DECLARATIONS /* intentional without ';' */ - int j; - - I2C_SCL(1); - I2C_SDA(1); -#ifdef I2C_INIT - I2C_INIT; -#endif - I2C_TRISTATE; - for(j = 0; j < 9; j++) { - I2C_SCL(0); - I2C_DELAY; - I2C_DELAY; - I2C_SCL(1); - I2C_DELAY; - I2C_DELAY; - } - send_stop(); - I2C_TRISTATE; -} - -/*----------------------------------------------------------------------- - * START: High -> Low on SDA while SCL is High - */ -static void send_start(void) -{ - I2C_SOFT_DECLARATIONS /* intentional without ';' */ - - I2C_DELAY; - I2C_SDA(1); - I2C_ACTIVE; - I2C_DELAY; - I2C_SCL(1); - I2C_DELAY; - I2C_SDA(0); - I2C_DELAY; -} - -/*----------------------------------------------------------------------- - * STOP: Low -> High on SDA while SCL is High - */ -static void send_stop(void) -{ - I2C_SOFT_DECLARATIONS /* intentional without ';' */ - - I2C_SCL(0); - I2C_DELAY; - I2C_SDA(0); - I2C_ACTIVE; - I2C_DELAY; - I2C_SCL(1); - I2C_DELAY; - I2C_SDA(1); - I2C_DELAY; - I2C_TRISTATE; -} - -/*----------------------------------------------------------------------- - * ack should be I2C_ACK or I2C_NOACK - */ -static void send_ack(int ack) -{ - I2C_SOFT_DECLARATIONS /* intentional without ';' */ - - I2C_SCL(0); - I2C_DELAY; - I2C_ACTIVE; - I2C_SDA(ack); - I2C_DELAY; - I2C_SCL(1); - I2C_DELAY; - I2C_DELAY; - I2C_SCL(0); - I2C_DELAY; -} - -/*----------------------------------------------------------------------- - * Send 8 bits and look for an acknowledgement. - */ -static int write_byte(uchar data) -{ - I2C_SOFT_DECLARATIONS /* intentional without ';' */ - int j; - int nack; - - I2C_ACTIVE; - for(j = 0; j < 8; j++) { - I2C_SCL(0); - I2C_DELAY; - I2C_SDA(data & 0x80); - I2C_DELAY; - I2C_SCL(1); - I2C_DELAY; - I2C_DELAY; - - data <<= 1; - } - - /* - * Look for an <ACK>(negative logic) and return it. - */ - I2C_SCL(0); - I2C_DELAY; - I2C_SDA(1); - I2C_TRISTATE; - I2C_DELAY; - I2C_SCL(1); - I2C_DELAY; - I2C_DELAY; - nack = I2C_READ; - I2C_SCL(0); - I2C_DELAY; - I2C_ACTIVE; - - return(nack); /* not a nack is an ack */ -} - -/*----------------------------------------------------------------------- - * if ack == I2C_ACK, ACK the byte so can continue reading, else - * send I2C_NOACK to end the read. - */ -static uchar read_byte(int ack) -{ - I2C_SOFT_DECLARATIONS /* intentional without ';' */ - int data; - int j; - - /* - * Read 8 bits, MSB first. - */ - I2C_TRISTATE; - I2C_SDA(1); - data = 0; - for(j = 0; j < 8; j++) { - I2C_SCL(0); - I2C_DELAY; - I2C_SCL(1); - I2C_DELAY; - data <<= 1; - data |= I2C_READ; - I2C_DELAY; - } - send_ack(ack); - - return(data); -} - -/*----------------------------------------------------------------------- - * Initialization - */ -static void soft_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) -{ - /* - * WARNING: Do NOT save speed in a static variable: if the - * I2C routines are called before RAM is initialized (to read - * the DIMM SPD, for instance), RAM won't be usable and your - * system will crash. - */ - send_reset (); -} - -/*----------------------------------------------------------------------- - * Probe to see if a chip is present. Also good for checking for the - * completion of EEPROM writes since the chip stops responding until - * the write completes (typically 10mSec). - */ -static int soft_i2c_probe(struct i2c_adapter *adap, uint8_t addr) -{ - int rc; - - /* - * perform 1 byte write transaction with just address byte - * (fake write) - */ - send_start(); - rc = write_byte ((addr << 1) | 0); - send_stop(); - - return (rc ? 1 : 0); -} - -/*----------------------------------------------------------------------- - * Read bytes - */ -static int soft_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr, - int alen, uchar *buffer, int len) -{ - int shift; - PRINTD("i2c_read: chip %02X addr %02X alen %d buffer %p len %d\n", - chip, addr, alen, buffer, len); - -#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW - /* - * EEPROM chips that implement "address overflow" are ones - * like Catalyst 24WC04/08/16 which has 9/10/11 bits of - * address and the extra bits end up in the "chip address" - * bit slots. This makes a 24WC08 (1Kbyte) chip look like - * four 256 byte chips. - * - * Note that we consider the length of the address field to - * still be one byte because the extra address bits are - * hidden in the chip address. - */ - chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); - - PRINTD("i2c_read: fix addr_overflow: chip %02X addr %02X\n", - chip, addr); -#endif - - /* - * Do the addressing portion of a write cycle to set the - * chip's address pointer. If the address length is zero, - * don't do the normal write cycle to set the address pointer, - * there is no address pointer in this chip. - */ - send_start(); - if(alen > 0) { - if(write_byte(chip << 1)) { /* write cycle */ - send_stop(); - PRINTD("i2c_read, no chip responded %02X\n", chip); - return(1); - } - shift = (alen-1) * 8; - while(alen-- > 0) { - if(write_byte(addr >> shift)) { - PRINTD("i2c_read, address not <ACK>ed\n"); - return(1); - } - shift -= 8; - } - - /* Some I2C chips need a stop/start sequence here, - * other chips don't work with a full stop and need - * only a start. Default behaviour is to send the - * stop/start sequence. - */ -#ifdef CONFIG_SOFT_I2C_READ_REPEATED_START - send_start(); -#else - send_stop(); - send_start(); -#endif - } - /* - * Send the chip address again, this time for a read cycle. - * Then read the data. On the last byte, we do a NACK instead - * of an ACK(len == 0) to terminate the read. - */ - write_byte((chip << 1) | 1); /* read cycle */ - while(len-- > 0) { - *buffer++ = read_byte(len == 0); - } - send_stop(); - return(0); -} - -/*----------------------------------------------------------------------- - * Write bytes - */ -static int soft_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr, - int alen, uchar *buffer, int len) -{ - int shift, failures = 0; - - PRINTD("i2c_write: chip %02X addr %02X alen %d buffer %p len %d\n", - chip, addr, alen, buffer, len); - - send_start(); - if(write_byte(chip << 1)) { /* write cycle */ - send_stop(); - PRINTD("i2c_write, no chip responded %02X\n", chip); - return(1); - } - shift = (alen-1) * 8; - while(alen-- > 0) { - if(write_byte(addr >> shift)) { - PRINTD("i2c_write, address not <ACK>ed\n"); - return(1); - } - shift -= 8; - } - - while(len-- > 0) { - if(write_byte(*buffer++)) { - failures++; - } - } - send_stop(); - return(failures); -} - -/* - * Register soft i2c adapters - */ -U_BOOT_I2C_ADAP_COMPLETE(soft00, soft_i2c_init, soft_i2c_probe, - soft_i2c_read, soft_i2c_write, NULL, - CONFIG_SYS_I2C_SOFT_SPEED, CONFIG_SYS_I2C_SOFT_SLAVE, - 0) |