From: Henrik Nordstrom <hen...@henriknordstrom.net> Based linux-sunxi#sunxi commit d854c4de2f57 "arm: Handle .gnu.hash section in ldscripts" vs v2014.01.
As well as the following signed-off-by the sunxi branch shows commits to the sunxi_i2c.c file by: Stefan Roese <s...@denx.de> Signed-off-by: Henrik Nordstrom <hen...@henriknordstrom.net> Signed-off-by: Oliver Schinagl <oli...@schinagl.nl> Signed-off-by: Hans de Goede <hdego...@redhat.com> --- arch/arm/cpu/armv7/sunxi/board.c | 6 + arch/arm/include/asm/arch-sunxi/i2c.h | 169 ++++++++++++++++++++++ drivers/i2c/Makefile | 1 + drivers/i2c/sunxi_i2c.c | 260 ++++++++++++++++++++++++++++++++++ include/configs/sunxi-common.h | 8 ++ 5 files changed, 444 insertions(+) create mode 100644 arch/arm/include/asm/arch-sunxi/i2c.h create mode 100644 drivers/i2c/sunxi_i2c.c diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c index 72eed16..b00bf89 100644 --- a/arch/arm/cpu/armv7/sunxi/board.c +++ b/arch/arm/cpu/armv7/sunxi/board.c @@ -11,6 +11,7 @@ */ #include <common.h> +#include <i2c.h> #include <serial.h> #ifdef CONFIG_SPL_BUILD #include <spl.h> @@ -94,6 +95,11 @@ void s_init(void) gd = &gdata; preloader_console_init(); +#ifdef CONFIG_SPL_I2C_SUPPORT + /* Needed early by sunxi_board_init if PMU is enabled */ + i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); +#endif + sunxi_board_init(); #endif } diff --git a/arch/arm/include/asm/arch-sunxi/i2c.h b/arch/arm/include/asm/arch-sunxi/i2c.h new file mode 100644 index 0000000..74c2d18 --- /dev/null +++ b/arch/arm/include/asm/arch-sunxi/i2c.h @@ -0,0 +1,169 @@ +/* + * (C) Copyright 2012 Henrik Nordstrom <hen...@henriknordstrom.net> + * + * Based on sun4i linux kernle i2c.h + * (C) Copyright 2007-2012 + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * Tom Cubie <tangla...@allwinnertech.com> + * Victor Wei <weizih...@allwinnertech.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#ifndef _SUNXI_I2C_H_ +#define _SUNXI_I2C_H_ + +struct i2c { + u32 saddr; /* 31:8bit res,7-1bit for slave addr,0 bit for GCE */ + u32 xsaddr; /* 31:8bit res,7-0bit for second addr in 10bit addr */ + u32 data; /* 31:8bit res, 7-0bit send or receive data byte */ + u32 ctl; /* INT_EN,BUS_EN,M_STA,INT_FLAG,A_ACK */ + u32 status; /* 28 interrupt types + 0xf8 normal type = 29 */ + u32 clkr; /* 31:7bit res,6-3bit,CLK_M,2-0bit CLK_N */ + u32 reset; /* 31:1bit res;0bit,write 1 to clear 0. */ + u32 efr; /* 31:2bit res,1:0 bit data byte follow read comand */ + u32 lctl; /* 31:6bits res 5:0bit for sda&scl control */ +}; + +/* TWI address register */ +#define TWI_GCE_EN (0x1 << 0) /* gen call addr enable slave mode */ +#define TWI_ADDR_MASK (0x7f << 1) /* 7:1bits */ +#define TWI_XADDR_MASK 0xff /* 7:0bits for extend slave address */ + +#define TWI_DATA_MASK 0xff /* 7:0bits for send or received */ + +/* TWI Control Register Bit Fields */ +/* 1:0 bits reserved */ +/* set 1 to send A_ACK,then low level on SDA */ +#define TWI_CTL_ACK (0x1 << 2) +/* INT_FLAG,interrupt status flag: set '1' when interrupt coming */ +#define TWI_CTL_INTFLG (0x1 << 3) +#define TWI_CTL_STP (0x1 << 4) /* M_STP,Automatic clear 0 */ +#define TWI_CTL_STA (0x1 << 5) /* M_STA,atutomatic clear 0 */ +#define TWI_CTL_BUSEN (0x1 << 6) /* BUS_EN, mastr mode should be set 1 */ +#define TWI_CTL_INTEN (0x1 << 7) /* INT_EN */ +/* 31:8 bit reserved */ + +/* + * TWI Clock Register Bit Fields & Masks,default value:0x0000_0000 + * Fin is APB CLOCK INPUT; + * Fsample = F0 = Fin/2^CLK_N; + * F1 = F0/(CLK_M+1); + * + * Foscl = F1/10 = Fin/(2^CLK_N * (CLK_M+1)*10); + * Foscl is clock SCL;standard mode:100KHz or fast mode:400KHz + */ + +#define TWI_CLK_DIV_M (0xf << 3) /* 6:3bit */ +#define TWI_CLK_DIV_N (0x7 << 0) /* 2:0bit */ +#define TWI_CLK_DIV(N, M) ((((N) & 0xf) << 3) | (((M) & 0x7) << 0)) + +/* TWI Soft Reset Register Bit Fields & Masks */ +/* write 1 to clear 0, when complete soft reset clear 0 */ +#define TWI_SRST_SRST (0x1 << 0) + +/* TWI Enhance Feature Register Bit Fields & Masks */ +/* default -- 0x0 */ +/* 00:no,01: 1byte, 10:2 bytes, 11: 3bytes */ +#define TWI_EFR_MASK (0x3 << 0) +#define TWI_EFR_WARC_0 (0x0 << 0) +#define TWI_EFR_WARC_1 (0x1 << 0) +#define TWI_EFR_WARC_2 (0x2 << 0) +#define TWI_EFR_WARC_3 (0x3 << 0) + +/* twi line control register -default value: 0x0000_003a */ +/* SDA line state control enable ,1:enable;0:disable */ +#define TWI_LCR_SDA_EN (0x01 << 0) +/* SDA line state control bit, 1:high level;0:low level */ +#define TWI_LCR_SDA_CTL (0x01 << 1) +/* SCL line state control enable ,1:enable;0:disable */ +#define TWI_LCR_SCL_EN (0x01 << 2) +/* SCL line state control bit, 1:high level;0:low level */ +#define TWI_LCR_SCL_CTL (0x01 << 3) +/* current state of SDA,readonly bit */ +#define TWI_LCR_SDA_STATE_MASK (0x01 << 4) +/* current state of SCL,readonly bit */ +#define TWI_LCR_SCL_STATE_MASK (0x01 << 5) +/* 31:6bits reserved */ +#define TWI_LCR_IDLE_STATUS 0x3a + +/* TWI Status Register Bit Fields & Masks */ +#define TWI_STAT_MASK 0xff +/* 7:0 bits use only,default is 0xf8 */ +#define TWI_STAT_BUS_ERR 0x00 /* BUS ERROR */ + +/* Master mode use only */ +#define TWI_STAT_TX_STA 0x08 /* START condition transmitted */ +/* Repeated START condition transmitted */ +#define TWI_STAT_TX_RESTA 0x10 +/* Address+Write bit transmitted, ACK received */ +#define TWI_STAT_TX_AW_ACK 0x18 +/* Address+Write bit transmitted, ACK not received */ +#define TWI_STAT_TX_AW_NAK 0x20 +/* data byte transmitted in master mode,ack received */ +#define TWI_STAT_TXD_ACK 0x28 +/* data byte transmitted in master mode ,ack not received */ +#define TWI_STAT_TXD_NAK 0x30 +/* arbitration lost in address or data byte */ +#define TWI_STAT_ARBLOST 0x38 +/* Address+Read bit transmitted, ACK received */ +#define TWI_STAT_TX_AR_ACK 0x40 +/* Address+Read bit transmitted, ACK not received */ +#define TWI_STAT_TX_AR_NAK 0x48 +/* Second Address byte + Write bit transmitted, ACK received */ +#define TWI_STAT_TX_2AW_ACK 0xd0 +/* Second Address byte + Write bit transmitted, ACK received */ +#define TWI_STAT_TX_2AW_NAK 0xd8 +/* data byte received in master mode ,ack transmitted */ +#define TWI_STAT_RXD_ACK 0x50 +/* date byte received in master mode,not ack transmitted */ +#define TWI_STAT_RXD_NAK 0x58 + +/* Slave mode use only */ +/* Slave address+Write bit received, ACK transmitted */ +#define TWI_STAT_RXWS_ACK 0x60 +/* + * Arbitration lost in address as master, slave address + Write bit received, + * ACK transmitted + */ +#define TWI_STAT_ARBLOST_RXWS_ACK 0x68 +/* General Call address received, ACK transmitted */ +#define TWI_STAT_RXGCAS_ACK 0x70 +/* + * Arbitration lost in address as master, General Call address received, + * ACK transmitted + */ +#define TWI_STAT_ARBLOST_RXGCAS_ACK 0x78 +/* Data byte received after slave address received, ACK transmitted */ +#define TWI_STAT_RXDS_ACK 0x80 +/* Data byte received after slave address received, not ACK transmitted */ +#define TWI_STAT_RXDS_NAK 0x88 +/* Data byte received after General Call received, ACK transmitted */ +#define TWI_STAT_RXDGCAS_ACK 0x90 +/* Data byte received after General Call received, not ACK transmitted */ +#define TWI_STAT_RXDGCAS_NAK 0x98 +/* STOP or repeated START condition received in slave */ +#define TWI_STAT_RXSTPS_RXRESTAS 0xa0 +/* Slave address + Read bit received, ACK transmitted */ +#define TWI_STAT_RXRS_ACK 0xa8 +/* + * Arbitration lost in address as master, slave address + Read bit received, + * ACK transmitted + */ +#define TWI_STAT_ARBLOST_SLAR_ACK 0xb0 +/* Data byte transmitted in slave mode, ACK received */ +#define TWI_STAT_TXDS_ACK 0xb8 +/* Data byte transmitted in slave mode, ACK not received */ +#define TWI_STAT_TXDS_NAK 0xc0 +/* Last byte transmitted in slave mode, ACK received */ +#define TWI_STAT_TXDSL_ACK 0xc8 + +/* 10bit Address, second part of address */ +/* Second Address byte+Write bit transmitted,ACK received */ +#define TWI_STAT_TX_SAW_ACK 0xd0 +/* Second Address byte+Write bit transmitted,ACK not received */ +#define TWI_STAT_TX_SAW_NAK 0xd8 + +/* No relevant status infomation,INT_FLAG = 0 */ +#define TWI_STAT_IDLE 0xf8 + +#endif diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index fa3a875..2a44db4 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_PCA9564_I2C) += pca9564_i2c.o obj-$(CONFIG_TSI108_I2C) += tsi108_i2c.o obj-$(CONFIG_U8500_I2C) += u8500_i2c.o obj-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o +obj-$(CONFIG_SUNXI_I2C) += sunxi_i2c.o obj-$(CONFIG_SYS_I2C) += i2c_core.o obj-$(CONFIG_SYS_I2C_FSL) += fsl_i2c.o obj-$(CONFIG_SYS_I2C_FTI2C010) += fti2c010.o diff --git a/drivers/i2c/sunxi_i2c.c b/drivers/i2c/sunxi_i2c.c new file mode 100644 index 0000000..9a542f6 --- /dev/null +++ b/drivers/i2c/sunxi_i2c.c @@ -0,0 +1,260 @@ +/* + * (C) Copyright 2012 Henrik Nordstrom <hen...@henriknordstrom.net> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <i2c.h> +#include <asm/io.h> +#include <asm/arch/clock.h> +#include <asm/arch/cpu.h> +#include <asm/arch/gpio.h> +#include <asm/arch/i2c.h> + +static struct i2c __attribute__ ((section(".data"))) *i2c_base = + (struct i2c *)0x1c2ac00; + +void i2c_init(int speed, int slaveaddr) +{ + int timeout = 0x2ff; + + sunxi_gpio_set_cfgpin(SUNXI_GPB(0), SUNXI_GPB0_TWI0); + sunxi_gpio_set_cfgpin(SUNXI_GPB(1), SUNXI_GPB0_TWI0); + clock_twi_onoff(0, 1); + + /* Enable the i2c bus */ + writel(TWI_CTL_BUSEN, &i2c_base->ctl); + + /* 400KHz operation M=2, N=1, 24MHz APB clock */ + writel(TWI_CLK_DIV(2, 1), &i2c_base->clkr); + writel(TWI_SRST_SRST, &i2c_base->reset); + + while ((readl(&i2c_base->reset) & TWI_SRST_SRST) && timeout--); +} + +int i2c_probe(uchar chip) +{ + return -1; +} + +static int i2c_wait_ctl(int mask, int state) +{ + int timeout = 0x2ff; + int value = state ? mask : 0; + + debug("i2c_wait_ctl(%x == %x), ctl=%x, status=%x\n", mask, value, + i2c_base->ctl, i2c_base->status); + + while (((readl(&i2c_base->ctl) & mask) != value) && timeout-- > 0); + + debug("i2c_wait_ctl(), timeout=%d, ctl=%x, status=%x\n", timeout, + i2c_base->ctl, i2c_base->status); + + if (timeout != 0) + return 0; + else + return -1; +} + +static void i2c_clear_irq(void) +{ + writel(readl(&i2c_base->ctl) & ~TWI_CTL_INTFLG, &i2c_base->ctl); +} + +static int i2c_wait_irq(void) +{ + return i2c_wait_ctl(TWI_CTL_INTFLG, 1); +} + +static int i2c_wait_status(int status) +{ + int timeout = 0x2ff; + + while (readl(&i2c_base->status) != status && timeout-- > 0); + + if (timeout != 0) + return 0; + else + return -1; +} + +static int i2c_wait_irq_status(int status) +{ + if (i2c_wait_irq() != 0) + return -1; + + if (readl(&i2c_base->status) != status) + return -1; + + return 0; +} + +static int i2c_wait_bus_idle(void) +{ + int timeout = 0x2ff; + + while (readl(&i2c_base->lctl) != 0x3a && timeout-- > 0); + + if (timeout != 0) + return 0; + else + return -1; +} + +static int i2c_stop(void) +{ + u32 ctl; + + ctl = readl(&i2c_base->ctl) & 0xc0; + ctl |= TWI_CTL_STP; + + writel(ctl, &i2c_base->ctl); + + /* dummy to delay one I/O operation to make sure it's started */ + (void)readl(&i2c_base->ctl); + + if (i2c_wait_ctl(TWI_CTL_STP, 0) != 0) + return -1; + if (i2c_wait_status(TWI_STAT_IDLE)) + return -1; + if (i2c_wait_bus_idle() != 0) + return -1; + + return 0; +} + +static int i2c_send_data(u8 data, u8 status) +{ + debug("i2c_write(%02x, %x), ctl=%x, status=%x\n", data, status, + i2c_base->ctl, i2c_base->status); + + writel(data, &i2c_base->data); + i2c_clear_irq(); + + if (i2c_wait_irq_status(status) != 0) + return -1; + + return 0; +} + +static int i2c_start(int status) +{ + u32 ctl; + + debug("i2c_start(%x), ctl=%x, status=%x\n", status, i2c_base->ctl, + i2c_base->status); + /* Check that the controller is idle */ + if (status == TWI_STAT_TX_STA && + readl(&i2c_base->status) != TWI_STAT_IDLE) { + return -1; + } + + writel(0, &i2c_base->efr); + + /* Send start */ + ctl = readl(&i2c_base->ctl); + ctl |= TWI_CTL_STA; /* Set start bit */ + ctl &= ~TWI_CTL_INTFLG; /* Clear int flag */ + writel(ctl, &i2c_base->ctl); + + if (i2c_wait_ctl(TWI_CTL_STA, 0) != 0) + return -1; + if (i2c_wait_irq_status(status) != 0) + return -1; + + return 0; +} + +int i2c_do_read(uchar chip, uint addr, int alen, uchar *buffer, int len) +{ + u32 status; + u32 ctl; + + if (i2c_start(TWI_STAT_TX_STA) != 0) + return -1; + + /* Send chip address */ + if (i2c_send_data(chip << 1 | 0, TWI_STAT_TX_AW_ACK) != 0) + return -1; + + /* Send data address */ + if (i2c_send_data(addr, TWI_STAT_TXD_ACK) != 0) + return -1; + + /* Send restart for read */ + if (i2c_start(TWI_STAT_TX_RESTA) != 0) + return -1; + + /* Send chip address */ + if (i2c_send_data(chip << 1 | 1, TWI_STAT_TX_AR_ACK) != 0) + return -1; + + /* Set ACK mode */ + ctl = readl(&i2c_base->ctl); + ctl |= TWI_CTL_ACK; + writel(ctl, &i2c_base->ctl); + status = TWI_STAT_RXD_ACK; + + /* Read data */ + while (len > 0) { + if (len == 1) { + /* Set NACK mode (last byte) */ + ctl = readl(&i2c_base->ctl); + ctl &= ~TWI_CTL_ACK; + writel(ctl, &i2c_base->ctl); + status = TWI_STAT_RXD_NAK; + } + + i2c_clear_irq(); + if (i2c_wait_irq_status(status) != 0) + return -1; + + *buffer++ = readl(&i2c_base->data); + len--; + } + + return 0; +} + +int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) +{ + int rc = i2c_do_read(chip, addr, alen, buffer, len); + + i2c_stop(); + + return rc; +} + +static int i2c_do_write(uchar chip, uint addr, int alen, uchar *buffer, + int len) +{ + if (i2c_start(TWI_STAT_TX_STA) != 0) + return -1; + + /* Send chip address */ + if (i2c_send_data(chip << 1 | 0, TWI_STAT_TX_AW_ACK) != 0) + return -1; + + /* Send data address */ + if (i2c_send_data(addr, TWI_STAT_TXD_ACK) != 0) + return -1; + + /* Send data */ + while (len > 0) { + if (i2c_send_data(*buffer++, TWI_STAT_TXD_ACK) != 0) + return -1; + len--; + } + + return 0; +} + +int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) +{ + int rc = i2c_do_write(chip, addr, alen, buffer, len); + + i2c_stop(); + + return rc; +} diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h index fe41b89..1f2bcb5 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -176,6 +176,14 @@ #undef CONFIG_CMD_NET #undef CONFIG_CMD_NFS +/* I2C */ +#define CONFIG_SPL_I2C_SUPPORT +#define CONFIG_SYS_I2C_SPEED 400000 +#define CONFIG_HARD_I2C +#define CONFIG_SUNXI_I2C +#define CONFIG_SYS_I2C_SLAVE 0x7f +#define CONFIG_CMD_I2C + #ifndef CONFIG_CONS_INDEX #define CONFIG_CONS_INDEX 1 /* UART0 */ #endif -- 1.9.0 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot