I2C: JZ4780: Add support for the X1000.
Add support for probing i2c driver on the X1000 Soc from Ingenic. call the corresponding fifo parameter according to the device model obtained from the devicetree. Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com> Acked-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
周琰杰 (Zhou Yanjie)
Wolfram Sang
Родитель
f4b5af78cb
Коммит
21575a7a8d
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@ -4,6 +4,7 @@
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*
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* Copyright (C) 2006 - 2009 Ingenic Semiconductor Inc.
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* Copyright (C) 2015 Imagination Technologies
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* Copyright (C) 2019 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
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*/
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#include <linux/bitops.h>
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@ -17,6 +18,7 @@
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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@ -55,6 +57,7 @@
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#define JZ4780_I2C_ACKGC 0x98
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#define JZ4780_I2C_ENSTA 0x9C
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#define JZ4780_I2C_SDAHD 0xD0
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#define X1000_I2C_SDAHD 0x7C
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#define JZ4780_I2C_CTRL_STPHLD BIT(7)
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#define JZ4780_I2C_CTRL_SLVDIS BIT(6)
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@ -73,6 +76,8 @@
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#define JZ4780_I2C_STA_TFNF BIT(1)
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#define JZ4780_I2C_STA_ACT BIT(0)
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#define X1000_I2C_DC_STOP BIT(9)
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static const char * const jz4780_i2c_abrt_src[] = {
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"ABRT_7B_ADDR_NOACK",
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"ABRT_10ADDR1_NOACK",
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@ -130,18 +135,33 @@ static const char * const jz4780_i2c_abrt_src[] = {
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#define JZ4780_I2CFLCNT_ADJUST(n) (((n) - 1) < 8 ? 8 : ((n) - 1))
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#define JZ4780_I2C_FIFO_LEN 16
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#define TX_LEVEL 3
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#define RX_LEVEL (JZ4780_I2C_FIFO_LEN - TX_LEVEL - 1)
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#define X1000_I2C_FIFO_LEN 64
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#define JZ4780_I2C_TIMEOUT 300
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#define BUFSIZE 200
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enum ingenic_i2c_version {
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ID_JZ4780,
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ID_X1000,
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};
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/* ingenic_i2c_config: SoC specific config data. */
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struct ingenic_i2c_config {
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enum ingenic_i2c_version version;
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int fifosize;
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int tx_level;
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int rx_level;
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};
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struct jz4780_i2c {
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void __iomem *iomem;
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int irq;
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struct clk *clk;
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struct i2c_adapter adap;
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const struct ingenic_i2c_config *cdata;
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/* lock to protect rbuf and wbuf between xfer_rd/wr and irq handler */
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spinlock_t lock;
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@ -340,11 +360,18 @@ static int jz4780_i2c_set_speed(struct jz4780_i2c *i2c)
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if (hold_time >= 0) {
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/*i2c hold time enable */
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hold_time |= JZ4780_I2C_SDAHD_HDENB;
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jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, hold_time);
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if (i2c->cdata->version >= ID_X1000) {
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jz4780_i2c_writew(i2c, X1000_I2C_SDAHD, hold_time);
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} else {
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hold_time |= JZ4780_I2C_SDAHD_HDENB;
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jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, hold_time);
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}
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} else {
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/* disable hold time */
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jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, 0);
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if (i2c->cdata->version >= ID_X1000)
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jz4780_i2c_writew(i2c, X1000_I2C_SDAHD, 0);
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else
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jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, 0);
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}
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return 0;
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@ -359,9 +386,11 @@ static int jz4780_i2c_cleanup(struct jz4780_i2c *i2c)
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spin_lock_irqsave(&i2c->lock, flags);
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/* can send stop now if need */
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp &= ~JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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if (i2c->cdata->version < ID_X1000) {
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp &= ~JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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}
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/* disable all interrupts first */
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jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0);
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@ -399,11 +428,19 @@ static int jz4780_i2c_prepare(struct jz4780_i2c *i2c)
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return jz4780_i2c_enable(i2c);
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}
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static void jz4780_i2c_send_rcmd(struct jz4780_i2c *i2c, int cmd_count)
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static void jz4780_i2c_send_rcmd(struct jz4780_i2c *i2c,
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int cmd_count,
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int cmd_left)
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{
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int i;
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for (i = 0; i < cmd_count; i++)
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for (i = 0; i < cmd_count - 1; i++)
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jz4780_i2c_writew(i2c, JZ4780_I2C_DC, JZ4780_I2C_DC_READ);
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if ((cmd_left == 0) && (i2c->cdata->version >= ID_X1000))
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jz4780_i2c_writew(i2c, JZ4780_I2C_DC,
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JZ4780_I2C_DC_READ | X1000_I2C_DC_STOP);
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else
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jz4780_i2c_writew(i2c, JZ4780_I2C_DC, JZ4780_I2C_DC_READ);
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}
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@ -458,37 +495,44 @@ static irqreturn_t jz4780_i2c_irq(int irqno, void *dev_id)
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rd_left = i2c->rd_total_len - i2c->rd_data_xfered;
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if (rd_left <= JZ4780_I2C_FIFO_LEN)
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if (rd_left <= i2c->cdata->fifosize)
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jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, rd_left - 1);
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}
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if (intst & JZ4780_I2C_INTST_TXEMP) {
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if (i2c->is_write == 0) {
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int cmd_left = i2c->rd_total_len - i2c->rd_cmd_xfered;
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int max_send = (JZ4780_I2C_FIFO_LEN - 1)
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int max_send = (i2c->cdata->fifosize - 1)
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- (i2c->rd_cmd_xfered
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- i2c->rd_data_xfered);
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int cmd_to_send = min(cmd_left, max_send);
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if (i2c->rd_cmd_xfered != 0)
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cmd_to_send = min(cmd_to_send,
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JZ4780_I2C_FIFO_LEN
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- TX_LEVEL - 1);
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i2c->cdata->fifosize
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- i2c->cdata->tx_level - 1);
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if (cmd_to_send) {
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jz4780_i2c_send_rcmd(i2c, cmd_to_send);
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i2c->rd_cmd_xfered += cmd_to_send;
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cmd_left = i2c->rd_total_len -
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i2c->rd_cmd_xfered;
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jz4780_i2c_send_rcmd(i2c,
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cmd_to_send, cmd_left);
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}
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cmd_left = i2c->rd_total_len - i2c->rd_cmd_xfered;
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if (cmd_left == 0) {
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intmsk = jz4780_i2c_readw(i2c, JZ4780_I2C_INTM);
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intmsk &= ~JZ4780_I2C_INTM_MTXEMP;
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jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, intmsk);
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp &= ~JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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if (i2c->cdata->version < ID_X1000) {
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tmp = jz4780_i2c_readw(i2c,
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JZ4780_I2C_CTRL);
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tmp &= ~JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c,
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JZ4780_I2C_CTRL, tmp);
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}
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}
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} else {
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unsigned short data;
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@ -497,23 +541,26 @@ static irqreturn_t jz4780_i2c_irq(int irqno, void *dev_id)
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i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA);
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while ((i2c_sta & JZ4780_I2C_STA_TFNF) &&
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(i2c->wt_len > 0)) {
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(i2c->wt_len > 0)) {
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i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA);
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data = *i2c->wbuf;
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data &= ~JZ4780_I2C_DC_READ;
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jz4780_i2c_writew(i2c, JZ4780_I2C_DC,
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data);
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if ((!i2c->stop_hold) && (i2c->cdata->version >=
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ID_X1000))
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data |= X1000_I2C_DC_STOP;
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jz4780_i2c_writew(i2c, JZ4780_I2C_DC, data);
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i2c->wbuf++;
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i2c->wt_len--;
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}
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if (i2c->wt_len == 0) {
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if (!i2c->stop_hold) {
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if ((!i2c->stop_hold) && (i2c->cdata->version <
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ID_X1000)) {
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tmp = jz4780_i2c_readw(i2c,
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JZ4780_I2C_CTRL);
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JZ4780_I2C_CTRL);
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tmp &= ~JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL,
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tmp);
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jz4780_i2c_writew(i2c,
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JZ4780_I2C_CTRL, tmp);
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}
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jz4780_i2c_trans_done(i2c);
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@ -567,20 +614,22 @@ static inline int jz4780_i2c_xfer_read(struct jz4780_i2c *i2c,
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i2c->rd_data_xfered = 0;
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i2c->rd_cmd_xfered = 0;
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if (len <= JZ4780_I2C_FIFO_LEN)
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if (len <= i2c->cdata->fifosize)
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jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, len - 1);
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else
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jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, RX_LEVEL);
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jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, i2c->cdata->rx_level);
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jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, TX_LEVEL);
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jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, i2c->cdata->tx_level);
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jz4780_i2c_writew(i2c, JZ4780_I2C_INTM,
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JZ4780_I2C_INTM_MRXFL | JZ4780_I2C_INTM_MTXEMP
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| JZ4780_I2C_INTM_MTXABT | JZ4780_I2C_INTM_MRXOF);
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp |= JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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if (i2c->cdata->version < ID_X1000) {
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp |= JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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}
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spin_unlock_irqrestore(&i2c->lock, flags);
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@ -626,14 +675,16 @@ static inline int jz4780_i2c_xfer_write(struct jz4780_i2c *i2c,
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i2c->wbuf = buf;
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i2c->wt_len = len;
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jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, TX_LEVEL);
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jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, i2c->cdata->tx_level);
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jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, JZ4780_I2C_INTM_MTXEMP
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| JZ4780_I2C_INTM_MTXABT);
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp |= JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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if (i2c->cdata->version < ID_X1000) {
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp |= JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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}
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spin_unlock_irqrestore(&i2c->lock, flags);
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@ -716,8 +767,25 @@ static const struct i2c_algorithm jz4780_i2c_algorithm = {
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.functionality = jz4780_i2c_functionality,
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};
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static const struct ingenic_i2c_config jz4780_i2c_config = {
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.version = ID_JZ4780,
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.fifosize = JZ4780_I2C_FIFO_LEN,
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.tx_level = JZ4780_I2C_FIFO_LEN / 2,
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.rx_level = JZ4780_I2C_FIFO_LEN / 2 - 1,
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};
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static const struct ingenic_i2c_config x1000_i2c_config = {
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.version = ID_X1000,
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.fifosize = X1000_I2C_FIFO_LEN,
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.tx_level = X1000_I2C_FIFO_LEN / 2,
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.rx_level = X1000_I2C_FIFO_LEN / 2 - 1,
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};
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static const struct of_device_id jz4780_i2c_of_matches[] = {
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{ .compatible = "ingenic,jz4780-i2c", },
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{ .compatible = "ingenic,jz4780-i2c", .data = &jz4780_i2c_config },
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{ .compatible = "ingenic,x1000-i2c", .data = &x1000_i2c_config },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, jz4780_i2c_of_matches);
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@ -734,6 +802,12 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
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if (!i2c)
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return -ENOMEM;
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i2c->cdata = device_get_match_data(&pdev->dev);
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if (!i2c->cdata) {
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dev_err(&pdev->dev, "Error: No device match found\n");
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return -ENODEV;
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}
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i2c->adap.owner = THIS_MODULE;
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i2c->adap.algo = &jz4780_i2c_algorithm;
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i2c->adap.algo_data = i2c;
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@ -777,9 +851,11 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
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dev_info(&pdev->dev, "Bus frequency is %d KHz\n", i2c->speed);
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp &= ~JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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if (i2c->cdata->version < ID_X1000) {
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tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
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tmp &= ~JZ4780_I2C_CTRL_STPHLD;
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jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
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}
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jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0x0);
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