[PATCH v1] i2c: nuvoton: Add NPCM7xx i2c driver
Heiko Schocher
hs at denx.de
Mon May 23 10:42:25 CEST 2022
Hello Jim,
On 23.05.22 10:16, Jim Liu wrote:
> Hi Heiko
>
> Thanks for your reply.
> I will follow your suggestion to modify it for version 2.
> and some explain and question as below:
>
> 1. while function will do the i2c recovery feature .
> the function will break when toggle 27 times or SDA is high.
>> + while (1) {
>> + /* toggle SCL line */
>> + writeb(SMBCST_TGSCL, ®->cst);
>> +
>> + udelay(20);
>> + val = readb(®->ctl3);
>> + if (val & SMBCTL3_SDA_LVL)
>> + break;
>> + if (iter-- == 0)
>> + break;
>> + }
Ah, yes, seems I was blind... sorry.
> 2. npcm845 is our new bmc and we are on-going to push it to linux.
> This link is our push status.
> https://patchwork.ozlabs.org/project/linux-i2c/patch/20220517101142.28421-10-warp5tw@gmail.com/
Ah, thanks!
> may i keep this npcm845 compatible or remove it?
If it gets accepted in linux, I am fine with it... ah I see:
https://lore.kernel.org/lkml/20220517101142.28421-2-warp5tw@gmail.com/
you add there the new compatible entry and have already a Reviewed-by
from Rob, so I think this is fine to accept it in u-boot too.
bye,
Heiko
> On Thu, May 19, 2022 at 12:48 PM Heiko Schocher <hs at denx.de> wrote:
>>
>> Hello Jim,
>>
>> On 17.05.22 10:25, Jim Liu wrote:
>>> Add Nuvoton BMC NPCM750 i2c driver
>>>
>>> Signed-off-by: Jim Liu <JJLIU0 at nuvoton.com>
>>> ---
>>> drivers/i2c/Kconfig | 5 +
>>> drivers/i2c/Makefile | 1 +
>>> drivers/i2c/npcm-i2c.c | 632 +++++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 638 insertions(+)
>>> create mode 100644 drivers/i2c/npcm-i2c.c
>>>
>>> diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
>>> index d25c5736ef..7e113b289e 100644
>>> --- a/drivers/i2c/Kconfig
>>> +++ b/drivers/i2c/Kconfig
>>> @@ -447,6 +447,11 @@ config SYS_I2C_NEXELL
>>> have several I2C ports and all are provided, controlled by the
>>> device tree.
>>>
>>> +config SYS_I2C_NPCM
>>> + bool "Nuvoton NPCM I2C driver"
>>> + help
>>> + Support for Nuvoton I2C controller driver.
>>> +
>>> config SYS_I2C_OCORES
>>> bool "ocores I2C driver"
>>> depends on DM_I2C
>>> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
>>> index 9d41f379bb..7e046f809a 100644
>>> --- a/drivers/i2c/Makefile
>>> +++ b/drivers/i2c/Makefile
>>> @@ -33,6 +33,7 @@ obj-$(CONFIG_SYS_I2C_MV) += mv_i2c.o
>>> obj-$(CONFIG_SYS_I2C_MVTWSI) += mvtwsi.o
>>> obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o
>>> obj-$(CONFIG_SYS_I2C_NEXELL) += nx_i2c.o
>>> +obj-$(CONFIG_SYS_I2C_NPCM) += npcm_i2c.o
>>> obj-$(CONFIG_SYS_I2C_OCORES) += ocores_i2c.o
>>> obj-$(CONFIG_SYS_I2C_OCTEON) += octeon_i2c.o
>>> obj-$(CONFIG_SYS_I2C_OMAP24XX) += omap24xx_i2c.o
>>> diff --git a/drivers/i2c/npcm-i2c.c b/drivers/i2c/npcm-i2c.c
>>> new file mode 100644
>>> index 0000000000..5a066a164b
>>> --- /dev/null
>>> +++ b/drivers/i2c/npcm-i2c.c
>>> @@ -0,0 +1,632 @@
>>> +// SPDX-License-Identifier: GPL-2.0+
>>> +/*
>>> + * Copyright (c) 2021 Nuvoton Technology Corp.
>>> + */
>>> +
>>> +#include <clk.h>
>>> +#include <dm.h>
>>> +#include <i2c.h>
>>> +#include <asm/io.h>
>>> +#include <linux/iopoll.h>
>>> +#include <asm/arch/gcr.h>
>>> +
>>> +#define I2C_FREQ_100K 100000
>>> +#define NPCM_I2C_TIMEOUT_MS 10
>>> +#define NPCM7XX_I2CSEGCTL_INIT_VAL 0x0333F000
>>> +#define NPCM8XX_I2CSEGCTL_INIT_VAL 0x9333F000
>>> +
>>> +/* SCLFRQ min/max field values */
>>> +#define SCLFRQ_MIN 10
>>> +#define SCLFRQ_MAX 511
>>> +
>>> +/* SMBCTL1 */
>>> +#define SMBCTL1_START BIT(0)
>>> +#define SMBCTL1_STOP BIT(1)
>>> +#define SMBCTL1_INTEN BIT(2)
>>> +#define SMBCTL1_ACK BIT(4)
>>> +#define SMBCTL1_STASTRE BIT(7)
>>> +
>>> +/* SMBCTL2 */
>>> +#define SMBCTL2_ENABLE BIT(0)
>>> +
>>> +/* SMBCTL3 */
>>> +#define SMBCTL3_SCL_LVL BIT(7)
>>> +#define SMBCTL3_SDA_LVL BIT(6)
>>> +
>>> +/* SMBCST */
>>> +#define SMBCST_BB BIT(1)
>>> +#define SMBCST_TGSCL BIT(5)
>>> +
>>> +/* SMBST */
>>> +#define SMBST_XMIT BIT(0)
>>> +#define SMBST_MASTER BIT(1)
>>> +#define SMBST_STASTR BIT(3)
>>> +#define SMBST_NEGACK BIT(4)
>>> +#define SMBST_BER BIT(5)
>>> +#define SMBST_SDAST BIT(6)
>>> +
>>> +/* SMBCST3 in bank0 */
>>> +#define SMBCST3_EO_BUSY BIT(7)
>>> +
>>> +/* SMBFIF_CTS in bank1 */
>>> +#define SMBFIF_CTS_CLR_FIFO BIT(6)
>>> +
>>> +#define SMBFIF_CTL_FIFO_EN BIT(4)
>>> +#define SMBCTL3_BNK_SEL BIT(5)
>>> +
>>> +enum {
>>> + I2C_ERR_NACK = 1,
>>> + I2C_ERR_BER,
>>> + I2C_ERR_TIMEOUT,
>>> +};
>>> +
>>> +struct smb_bank0_regs {
>>> + u8 addr3;
>>> + u8 addr7;
>>> + u8 addr4;
>>> + u8 addr8;
>>> + u16 addr5;
>>> + u16 addr6;
>>> + u8 cst2;
>>> + u8 cst3;
>>> + u8 ctl4;
>>> + u8 ctl5;
>>> + u8 scllt;
>>> + u8 fif_ctl;
>>> + u8 sclht;
>>> +};
>>> +
>>> +struct smb_bank1_regs {
>>> + u8 fif_cts;
>>> + u8 fair_per;
>>> + u16 txf_ctl;
>>> + u32 t_out;
>>> + u8 cst2;
>>> + u8 cst3;
>>> + u16 txf_sts;
>>> + u16 rxf_sts;
>>> + u8 rxf_ctl;
>>> +};
>>> +
>>> +struct npcm_i2c_regs {
>>> + u16 sda;
>>> + u16 st;
>>> + u16 cst;
>>> + u16 ctl1;
>>> + u16 addr;
>>> + u16 ctl2;
>>> + u16 addr2;
>>> + u16 ctl3;
>>> + union {
>>> + struct smb_bank0_regs bank0;
>>> + struct smb_bank1_regs bank1;
>>> + };
>>> +
>>> +};
>>> +
>>> +struct npcm_i2c_bus {
>>> + struct npcm_i2c_regs *reg;
>>> + int num;
>>> + u32 apb_clk;
>>> + u32 freq;
>>> + bool started;
>>> +};
>>> +
>>> +static void npcm_dump_regs(struct npcm_i2c_bus *bus)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> +
>>> + printf("\n");
>>> + printf("SMBST=0x%x\n", readb(®->st));
>>> + printf("SMBCST=0x%x\n", readb(®->cst));
>>> + printf("SMBCTL1=0x%x\n", readb(®->ctl1));
>>> + printf("\n");
>>> +}
>>> +
>>> +static int npcm_i2c_check_sda(struct npcm_i2c_bus *bus)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + ulong start_time;
>>> + int err = I2C_ERR_TIMEOUT;
>>> + u8 val;
>>> +
>>> + start_time = get_timer(0);
>>> + /* wait SDAST to be 1 */
>>> + while (get_timer(start_time) < NPCM_I2C_TIMEOUT_MS) {
>>> + val = readb(®->st);
>>> + if (val & SMBST_NEGACK) {
>>> + err = I2C_ERR_NACK;
>>> + break;
>>> + }
>>> + if (val & SMBST_BER) {
>>> + err = I2C_ERR_BER;
>>> + break;
>>> + }
>>> + if (val & SMBST_SDAST) {
>>> + err = 0;
>>> + break;
>>> + }
>>> + }
>>> +
>>> + if (err)
>>> + printf("%s: err %d\n", __func__, err);
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static int npcm_i2c_send_start(struct npcm_i2c_bus *bus)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + ulong start_time;
>>> + int err = I2C_ERR_TIMEOUT;
>>> +
>>> + /* Generate START condition */
>>> + writeb(readb(®->ctl1) | SMBCTL1_START, ®->ctl1);
>>> +
>>> + start_time = get_timer(0);
>>> + while (get_timer(start_time) < NPCM_I2C_TIMEOUT_MS) {
>>> + if (readb(®->st) & SMBST_BER)
>>> + return I2C_ERR_BER;
>>> + if (readb(®->st) & SMBST_MASTER) {
>>> + err = 0;
>>> + break;
>>> + }
>>> + }
>>> + bus->started = true;
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static int npcm_i2c_send_stop(struct npcm_i2c_bus *bus, bool wait)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + ulong start_time;
>>> + int err = I2C_ERR_TIMEOUT;
>>> +
>>> + writeb(readb(®->ctl1) | SMBCTL1_STOP, ®->ctl1);
>>> +
>>> + /* Clear NEGACK, STASTR and BER bits */
>>> + writeb(SMBST_STASTR | SMBST_NEGACK | SMBST_BER, ®->st);
>>> +
>>> + bus->started = false;
>>> +
>>> + if (!wait)
>>> + return 0;
>>> +
>>> + start_time = get_timer(0);
>>> + while (get_timer(start_time) < NPCM_I2C_TIMEOUT_MS) {
>>> + if ((readb(®->ctl1) & SMBCTL1_STOP) == 0) {
>>> + err = 0;
>>> + break;
>>> + }
>>> + }
>>> + if (err) {
>>> + printf("%s: err %d\n", __func__, err);
>>> + npcm_dump_regs(bus);
>>> + }
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static void npcm_i2c_reset(struct npcm_i2c_bus *bus)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> +
>>> + printf("%s: module %d\n", __func__, bus->num);
>>
>> May better only debug() ?
>>
>>> + /* disable & enable SMB moudle */
>>> + writeb(readb(®->ctl2) & ~SMBCTL2_ENABLE, ®->ctl2);
>>> + writeb(readb(®->ctl2) | SMBCTL2_ENABLE, ®->ctl2);
>>
>> You may want to use here clr/setbits_8 and friends?
>>
>> Please use them in this driver, thanks!
>>
>>> +
>>> + /* clear BB and status */
>>> + writeb(SMBCST_BB, ®->cst);
>>> + writeb(0xff, ®->st);
>>> +
>>> + /* select bank 1 */
>>> + writeb(readb(®->ctl3) | SMBCTL3_BNK_SEL, ®->ctl3);
>>> + /* Clear all fifo bits */
>>> + writeb(SMBFIF_CTS_CLR_FIFO, ®->bank1.fif_cts);
>>> +
>>> + /* select bank 0 */
>>> + writeb(readb(®->ctl3) & ~SMBCTL3_BNK_SEL, ®->ctl3);
>>> + /* clear EOB bit */
>>> + writeb(SMBCST3_EO_BUSY, ®->bank0.cst3);
>>> + /* single byte mode */
>>> + writeb(readb(®->bank0.fif_ctl) & ~SMBFIF_CTL_FIFO_EN, ®->bank0.fif_ctl);
>>> +
>>> + /* set POLL mode */
>>> + writeb(0, ®->ctl1);
>>> +}
>>> +
>>> +static void npcm_i2c_recovery(struct npcm_i2c_bus *bus, u32 addr)
>>> +{
>>> + u8 val;
>>> + int iter = 27;
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + int err;
>>> +
>>> + val = readb(®->ctl3);
>>> + /* Skip recovery, bus not stucked */
>>> + if ((val & SMBCTL3_SCL_LVL) && (val & SMBCTL3_SDA_LVL))
>>> + return;
>>> +
>>> + printf("Performing I2C bus %d recovery...\n", bus->num);
>>> + /* SCL/SDA are not releaed, perform recovery */
>>> + while (1) {
>>> + /* toggle SCL line */
>>> + writeb(SMBCST_TGSCL, ®->cst);
>>> +
>>> + udelay(20);
>>> + val = readb(®->ctl3);
>>> + if (val & SMBCTL3_SDA_LVL)
>>> + break;
>>> + if (iter-- == 0)
>>> + break;
>>> + }
>>
>> Hmm... endless while(1) ?
>>
>>> +
>>> + if (val & SMBCTL3_SDA_LVL) {
>>> + writeb((u8)((addr << 1) & 0xff), ®->sda);
>>> + err = npcm_i2c_send_start(bus);
>>> + if (!err) {
>>> + udelay(20);
>>> + npcm_i2c_send_stop(bus, false);
>>> + udelay(200);
>>> + printf("I2C bus %d recovery completed\n",
>>> + bus->num);
>>> + } else {
>>> + printf("%s: send START err %d\n", __func__, err);
>>> + }
>>> + } else {
>>> + printf("Fail to recover I2C bus %d\n", bus->num);
>>> + }
>>> + npcm_i2c_reset(bus);
>>> +}
>>> +
>>> +static int npcm_i2c_send_address(struct npcm_i2c_bus *bus, u8 addr,
>>> + bool stall)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + ulong start_time;
>>> + u8 val;
>>> +
>>> + /* Stall After Start Enable */
>>> + if (stall)
>>> + writeb(readb(®->ctl1) | SMBCTL1_STASTRE, ®->ctl1);
>>> +
>>> + writeb(addr, ®->sda);
>>> + if (stall) {
>>> + start_time = get_timer(0);
>>> + while (get_timer(start_time) < NPCM_I2C_TIMEOUT_MS) {
>>> + if (readb(®->st) & SMBST_STASTR)
>>> + break;
>>> +
>>> + if (readb(®->st) & SMBST_BER) {
>>> + writeb(readb(®->ctl1) & ~SMBCTL1_STASTRE,
>>> + ®->ctl1);
>>> + return I2C_ERR_BER;
>>> + }
>>> + }
>>> + }
>>> +
>>> + /* check ACK */
>>> + val = readb(®->st);
>>> + if (val & SMBST_NEGACK) {
>>> + debug("NACK on addr 0x%x\n", addr >> 1);
>>> + /* After a Stop condition, writing 1 to NEGACK clears it */
>>> + return I2C_ERR_NACK;
>>> + }
>>> + if (val & SMBST_BER)
>>> + return I2C_ERR_BER;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int npcm_i2c_read_bytes(struct npcm_i2c_bus *bus, u8 *data, int len)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + u8 val;
>>> + int i;
>>> + int err = 0;
>>> +
>>> + if (len == 1) {
>>> + /* bus should be stalled before receiving last byte */
>>> + writeb(readb(®->ctl1) | SMBCTL1_ACK, ®->ctl1);
>>> +
>>> + /* clear STASTRE if it is set */
>>> + if (readb(®->ctl1) & SMBCTL1_STASTRE) {
>>> + writeb(SMBST_STASTR, ®->st);
>>> + writeb(readb(®->ctl1) & ~SMBCTL1_STASTRE, ®->ctl1);
>>> + }
>>> + npcm_i2c_check_sda(bus);
>>> + npcm_i2c_send_stop(bus, false);
>>> + *data = readb(®->sda);
>>> + /* this must be done to generate STOP condition */
>>> + writeb(SMBST_NEGACK, ®->st);
>>> + } else {
>>> + for (i = 0; i < len; i++) {
>>> + /*
>>> + * When NEGACK bit is set to 1 after the transmission of a byte,
>>> + * SDAST is not set to 1.
>>> + */
>>> + if (i != (len - 1)) {
>>> + err = npcm_i2c_check_sda(bus);
>>> + } else {
>>> + err = readb_poll_timeout(®->ctl1, val,
>>> + !(val & SMBCTL1_ACK), 100000);
>>> + if (err) {
>>> + printf("wait nack timeout\n");
>>> + err = I2C_ERR_TIMEOUT;
>>> + npcm_dump_regs(bus);
>>> + }
>>> + }
>>> + if (err && err != I2C_ERR_TIMEOUT)
>>> + break;
>>> + if (i == (len - 2)) {
>>> + /* set NACK before last byte */
>>> + writeb(readb(®->ctl1) | SMBCTL1_ACK, ®->ctl1);
>>> + }
>>> + if (i == (len - 1)) {
>>> + /* last byte, send STOP condition */
>>> + npcm_i2c_send_stop(bus, false);
>>> + *data = readb(®->sda);
>>> + writeb(SMBST_NEGACK, ®->st);
>>> + break;
>>> + }
>>> + *data = readb(®->sda);
>>> + data++;
>>> + }
>>> + }
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static int npcm_i2c_send_bytes(struct npcm_i2c_bus *bus, u8 *data, int len)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + u8 val;
>>> + int i;
>>> + int err = 0;
>>> +
>>> + val = readb(®->st);
>>> + if (val & SMBST_NEGACK)
>>> + return I2C_ERR_NACK;
>>> + else if (val & SMBST_BER)
>>> + return I2C_ERR_BER;
>>> +
>>> + /* clear STASTRE if it is set */
>>> + if (readb(®->ctl1) & SMBCTL1_STASTRE)
>>> + writeb(readb(®->ctl1) & ~SMBCTL1_STASTRE, ®->ctl1);
>>> +
>>> + for (i = 0; i < len; i++) {
>>> + err = npcm_i2c_check_sda(bus);
>>> + if (err)
>>> + break;
>>> + writeb(*data, ®->sda);
>>> + data++;
>>> + }
>>> + npcm_i2c_check_sda(bus);
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static int npcm_i2c_read(struct npcm_i2c_bus *bus, u32 addr, u8 *data,
>>> + u32 len)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + int err;
>>> + bool stall;
>>> +
>>> + if (len <= 0)
>>> + return -EINVAL;
>>> +
>>> + /* send START condition */
>>> + err = npcm_i2c_send_start(bus);
>>> + if (err) {
>>> + debug("%s: send START err %d\n", __func__, err);
>>> + return err;
>>> + }
>>> +
>>> + stall = (len == 1) ? true : false;
>>> + /* send address byte */
>>> + err = npcm_i2c_send_address(bus, (u8)(addr << 1) | 0x1, stall);
>>> +
>>> + if (!err && len)
>>> + npcm_i2c_read_bytes(bus, data, len);
>>> +
>>> + if (err == I2C_ERR_NACK) {
>>> + /* clear NACK */
>>> + writeb(SMBST_NEGACK, ®->st);
>>> + }
>>> +
>>> + if (err)
>>> + debug("%s: err %d\n", __func__, err);
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static int npcm_i2c_write(struct npcm_i2c_bus *bus, u32 addr, u8 *data,
>>> + u32 len)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + int err;
>>> + bool stall;
>>> +
>>> + /* send START condition */
>>> + err = npcm_i2c_send_start(bus);
>>> + if (err) {
>>> + debug("%s: send START err %d\n", __func__, err);
>>> + return err;
>>> + }
>>> +
>>> + stall = (len == 0) ? true : false;
>>> + /* send address byte */
>>> + err = npcm_i2c_send_address(bus, (u8)(addr << 1), stall);
>>> +
>>> + if (!err && len)
>>> + err = npcm_i2c_send_bytes(bus, data, len);
>>> +
>>> + /* clear STASTRE if it is set */
>>> + if (stall)
>>> + writeb(readb(®->ctl1) & ~SMBCTL1_STASTRE, ®->ctl1);
>>> +
>>> + if (err)
>>> + debug("%s: err %d\n", __func__, err);
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static int npcm_i2c_xfer(struct udevice *dev,
>>> + struct i2c_msg *msg, int nmsgs)
>>> +{
>>> + struct npcm_i2c_bus *bus = dev_get_priv(dev);
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + int ret = 0, err = 0;
>>> +
>>> + if (nmsgs < 1 || nmsgs > 2) {
>>> + printf("%s: commands not support\n", __func__);
>>> + return -EREMOTEIO;
>>> + }
>>> + /* clear ST register */
>>> + writeb(0xFF, ®->st);
>>> +
>>> + for ( ; nmsgs > 0; nmsgs--, msg++) {
>>
>> above you say no commands supported, so this for loop is useless ..or?
>>
>>> + if (msg->flags & I2C_M_RD)
>>> + err = npcm_i2c_read(bus, msg->addr, msg->buf,
>>> + msg->len);
>>> + else
>>> + err = npcm_i2c_write(bus, msg->addr, msg->buf,
>>> + msg->len);
>>> + if (err) {
>>> + debug("i2c_xfer: error %d\n", err);
>>> + ret = -EREMOTEIO;
>>> + break;
>>> + }
>>> + }
>>> +
>>> + if (bus->started)
>>> + npcm_i2c_send_stop(bus, true);
>>> +
>>> + if (err)
>>> + npcm_i2c_recovery(bus, msg->addr);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static int npcm_i2c_init_clk(struct npcm_i2c_bus *bus, u32 bus_freq)
>>> +{
>>> + struct npcm_i2c_regs *reg = bus->reg;
>>> + u32 freq = bus->apb_clk;
>>> + u32 sclfrq;
>>> + u8 hldt, val;
>>> +
>>> + if (bus_freq > I2C_FREQ_100K) {
>>> + printf("Support standard mode only\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + /* SCLFRQ = T(SCL)/4/T(CLK) = FREQ(CLK)/4/FREQ(SCL) */
>>> + sclfrq = freq / (bus_freq * 4);
>>> + if (sclfrq < SCLFRQ_MIN || sclfrq > SCLFRQ_MAX)
>>> + return -EINVAL;
>>> +
>>> + if (freq >= 40000000)
>>> + hldt = 17;
>>> + else if (freq >= 12500000)
>>> + hldt = 15;
>>> + else
>>> + hldt = 7;
>>> +
>>> + val = readb(®->ctl2) & 0x1;
>>> + val |= (sclfrq & 0x7F) << 1;
>>> + writeb(val, ®->ctl2);
>>> +
>>> + /* clear 400K_MODE bit */
>>> + val = readb(®->ctl3) & 0xc;
>>> + val |= (sclfrq >> 7) & 0x3;
>>> + writeb(val, ®->ctl3);
>>> +
>>> + writeb(hldt, ®->bank0.ctl4);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int npcm_i2c_set_bus_speed(struct udevice *dev,
>>> + unsigned int speed)
>>> +{
>>> + struct npcm_i2c_bus *bus = dev_get_priv(dev);
>>> +
>>> + return npcm_i2c_init_clk(bus, speed);
>>> +}
>>> +
>>> +static int npcm_i2c_probe(struct udevice *dev)
>>> +{
>>> + struct npcm_i2c_bus *bus = dev_get_priv(dev);
>>> + struct npcm_gcr *gcr = (struct npcm_gcr *)NPCM_GCR_BA;
>>> + struct npcm_i2c_regs *reg;
>>> + u32 i2csegctl_val = dev_get_driver_data(dev);
>>> + struct clk clk;
>>> + int ret;
>>> +
>>> + ret = clk_get_by_index(dev, 0, &clk);
>>> + if (ret) {
>>> + printf("%s: ret %d\n", __func__, ret);
>>> + return ret;
>>> + }
>>> + bus->apb_clk = clk_get_rate(&clk);
>>> + if (bus->apb_clk <= 0) {
>>> + printf("%s: fail to get rate\n", __func__);
>>> + return -EINVAL;
>>> + }
>>> + clk_free(&clk);
>>> +
>>> + bus->num = dev->seq_;
>>> + bus->reg = dev_read_addr_ptr(dev);
>>> + bus->freq = dev_read_u32_default(dev, "clock-frequency", 100000);
>>> + bus->started = false;
>>> + reg = bus->reg;
>>> +
>>> + if (npcm_i2c_init_clk(bus, bus->freq)) {
>>> + printf("%s: init_clk failed\n", __func__);
>>> + return -EINVAL;
>>> + }
>>> +
>>> + /* set initial i2csegctl value */
>>> + writel(i2csegctl_val, &gcr->i2csegctl);
>>> +
>>> + /* enable SMB module */
>>> + writeb(readb(®->ctl2) | SMBCTL2_ENABLE, ®->ctl2);
>>> +
>>> + /* select register bank 0 */
>>> + writeb(readb(®->ctl3) & ~SMBCTL3_BNK_SEL, ®->ctl3);
>>> +
>>> + /* single byte mode */
>>> + writeb(readb(®->bank0.fif_ctl) & ~SMBFIF_CTL_FIFO_EN, ®->bank0.fif_ctl);
>>> +
>>> + /* set POLL mode */
>>> + writeb(0, ®->ctl1);
>>> +
>>> + printf("I2C bus %d ready. speed=%d, base=0x%x, apb=%u\n",
>>> + bus->num, bus->freq, (u32)(uintptr_t)bus->reg, bus->apb_clk);
>>
>> Please use debug here.
>>
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct dm_i2c_ops nuvoton_i2c_ops = {
>>> + .xfer = npcm_i2c_xfer,
>>> + .set_bus_speed = npcm_i2c_set_bus_speed,
>>> +};
>>
>> As you have a deblock function, may you want to set
>> .deblock here too?
>>
>>> +
>>> +static const struct udevice_id nuvoton_i2c_of_match[] = {
>>> + { .compatible = "nuvoton,npcm845-i2c", .data = NPCM8XX_I2CSEGCTL_INIT_VAL},
>>
>> I do not find this string in linux ... do you plan to push this
>> to linux?
>>
>>> + { .compatible = "nuvoton,npcm750-i2c", .data = NPCM7XX_I2CSEGCTL_INIT_VAL},
>>> + {}
>>> +};
>>
>> and please document the bindings in u-boot:/doc/device-tree-bindings/i2c
>>
>>> +
>>> +U_BOOT_DRIVER(npcm_i2c_bus) = {
>>> + .name = "npcm-i2c",
>>> + .id = UCLASS_I2C,
>>> + .of_match = nuvoton_i2c_of_match,
>>> + .probe = npcm_i2c_probe,
>>> + .priv_auto = sizeof(struct npcm_i2c_bus),
>>> + .ops = &nuvoton_i2c_ops,
>>> +};
>>> +
>>>
>>
>> Thanks!
>>
>> bye,
>> Heiko
>> --
>> DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
>> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
>> Phone: +49-8142-66989-52 Fax: +49-8142-66989-80 Email: hs at denx.de
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-52 Fax: +49-8142-66989-80 Email: hs at denx.de
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