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i2c: Add device tree support to i2c-pnx.c
This patch adds device tree support to the pnx-i2c driver by using platform resources for memory region and irq and removing dependency on mach includes. The following platforms are affected: * PNX * LPC31xx (WIP) * LPC32xx The patch is based on a patch by Jon Smirl, working on lpc31xx integration Signed-off-by: Roland Stigge <stigge@antcom.de> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Roland Stigge
parent
be460385af
commit
b41a216daf
36
Documentation/devicetree/bindings/i2c/pnx.txt
Normal file
36
Documentation/devicetree/bindings/i2c/pnx.txt
Normal file
@ -0,0 +1,36 @@
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* NXP PNX I2C Controller
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Required properties:
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- reg: Offset and length of the register set for the device
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- compatible: should be "nxp,pnx-i2c"
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- interrupts: configure one interrupt line
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- #address-cells: always 1 (for i2c addresses)
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- #size-cells: always 0
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- interrupt-parent: the phandle for the interrupt controller that
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services interrupts for this device.
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Optional properties:
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- clock-frequency: desired I2C bus clock frequency in Hz, Default: 100000 Hz
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Examples:
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i2c1: i2c@400a0000 {
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compatible = "nxp,pnx-i2c";
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reg = <0x400a0000 0x100>;
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interrupt-parent = <&mic>;
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interrupts = <51 0>;
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#address-cells = <1>;
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#size-cells = <0>;
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};
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i2c2: i2c@400a8000 {
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compatible = "nxp,pnx-i2c";
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reg = <0x400a8000 0x100>;
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interrupt-parent = <&mic>;
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interrupts = <50 0>;
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#address-cells = <1>;
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#size-cells = <0>;
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clock-frequency = <100000>;
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};
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@ -23,10 +23,11 @@
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <linux/of_i2c.h>
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#define I2C_PNX_TIMEOUT 10 /* msec */
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#define I2C_PNX_SPEED_KHZ 100
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#define I2C_PNX_REGION_SIZE 0x100
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#define I2C_PNX_TIMEOUT_DEFAULT 10 /* msec */
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#define I2C_PNX_SPEED_KHZ_DEFAULT 100
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#define I2C_PNX_REGION_SIZE 0x100
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enum {
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mstatus_tdi = 0x00000001,
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@ -74,8 +75,9 @@ enum {
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#define I2C_REG_TXS(a) ((a)->ioaddr + 0x28) /* Tx slave FIFO (RO) */
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#define I2C_REG_STFL(a) ((a)->ioaddr + 0x2c) /* Tx slave FIFO level (RO) */
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static inline int wait_timeout(long timeout, struct i2c_pnx_algo_data *data)
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static inline int wait_timeout(struct i2c_pnx_algo_data *data)
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{
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long timeout = data->timeout;
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while (timeout > 0 &&
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(ioread32(I2C_REG_STS(data)) & mstatus_active)) {
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mdelay(1);
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@ -84,8 +86,9 @@ static inline int wait_timeout(long timeout, struct i2c_pnx_algo_data *data)
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return (timeout <= 0);
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}
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static inline int wait_reset(long timeout, struct i2c_pnx_algo_data *data)
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static inline int wait_reset(struct i2c_pnx_algo_data *data)
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{
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long timeout = data->timeout;
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while (timeout > 0 &&
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(ioread32(I2C_REG_CTL(data)) & mcntrl_reset)) {
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mdelay(1);
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@ -97,7 +100,7 @@ static inline int wait_reset(long timeout, struct i2c_pnx_algo_data *data)
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static inline void i2c_pnx_arm_timer(struct i2c_pnx_algo_data *alg_data)
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{
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struct timer_list *timer = &alg_data->mif.timer;
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unsigned long expires = msecs_to_jiffies(I2C_PNX_TIMEOUT);
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unsigned long expires = msecs_to_jiffies(alg_data->timeout);
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if (expires <= 1)
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expires = 2;
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@ -135,7 +138,7 @@ static int i2c_pnx_start(unsigned char slave_addr,
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}
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/* First, make sure bus is idle */
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if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) {
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if (wait_timeout(alg_data)) {
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/* Somebody else is monopolizing the bus */
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dev_err(&alg_data->adapter.dev,
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"%s: Bus busy. Slave addr = %02x, cntrl = %x, stat = %x\n",
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@ -228,7 +231,7 @@ static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data)
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if (alg_data->mif.len == 0) {
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if (alg_data->last) {
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/* Wait until the STOP is seen. */
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if (wait_timeout(I2C_PNX_TIMEOUT, alg_data))
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if (wait_timeout(alg_data))
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dev_err(&alg_data->adapter.dev,
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"The bus is still active after timeout\n");
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}
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@ -326,7 +329,7 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data)
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if (alg_data->mif.len == 0) {
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if (alg_data->last)
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/* Wait until the STOP is seen. */
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if (wait_timeout(I2C_PNX_TIMEOUT, alg_data))
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if (wait_timeout(alg_data))
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dev_err(&alg_data->adapter.dev,
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"The bus is still active after timeout\n");
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@ -442,7 +445,7 @@ static void i2c_pnx_timeout(unsigned long data)
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ctl |= mcntrl_reset;
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iowrite32(ctl, I2C_REG_CTL(alg_data));
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wait_reset(I2C_PNX_TIMEOUT, alg_data);
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wait_reset(alg_data);
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alg_data->mif.ret = -EIO;
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complete(&alg_data->mif.complete);
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}
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@ -457,18 +460,18 @@ static inline void bus_reset_if_active(struct i2c_pnx_algo_data *alg_data)
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alg_data->adapter.name);
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iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
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I2C_REG_CTL(alg_data));
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wait_reset(I2C_PNX_TIMEOUT, alg_data);
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wait_reset(alg_data);
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} else if (!(stat & mstatus_rfe) || !(stat & mstatus_tfe)) {
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/* If there is data in the fifo's after transfer,
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* flush fifo's by reset.
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*/
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iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
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I2C_REG_CTL(alg_data));
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wait_reset(I2C_PNX_TIMEOUT, alg_data);
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wait_reset(alg_data);
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} else if (stat & mstatus_nai) {
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iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
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I2C_REG_CTL(alg_data));
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wait_reset(I2C_PNX_TIMEOUT, alg_data);
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wait_reset(alg_data);
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}
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}
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@ -612,6 +615,7 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev)
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struct i2c_pnx_algo_data *alg_data;
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unsigned long freq;
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struct resource *res;
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u32 speed = I2C_PNX_SPEED_KHZ_DEFAULT * 1000;
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alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL);
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if (!alg_data) {
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@ -626,6 +630,22 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev)
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alg_data->adapter.algo_data = alg_data;
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alg_data->adapter.nr = pdev->id;
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alg_data->timeout = I2C_PNX_TIMEOUT_DEFAULT;
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#ifdef CONFIG_OF
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alg_data->adapter.dev.of_node = of_node_get(pdev->dev.of_node);
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if (pdev->dev.of_node) {
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of_property_read_u32(pdev->dev.of_node, "clock-frequency",
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&speed);
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/*
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* At this point, it is planned to add an OF timeout property.
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* As soon as there is a consensus about how to call and handle
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* this, sth. like the following can be put here:
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*
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* of_property_read_u32(pdev->dev.of_node, "timeout",
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* &alg_data->timeout);
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*/
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}
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#endif
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alg_data->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(alg_data->clk)) {
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ret = PTR_ERR(alg_data->clk);
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@ -651,7 +671,7 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev)
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dev_err(&pdev->dev,
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"I/O region 0x%08x for I2C already in use.\n",
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res->start);
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ret = -ENODEV;
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ret = -ENOMEM;
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goto out_clkget;
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}
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@ -680,14 +700,14 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev)
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* the deglitching filter length.
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*/
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tmp = ((freq / 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2;
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tmp = (freq / speed) / 2 - 2;
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if (tmp > 0x3FF)
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tmp = 0x3FF;
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iowrite32(tmp, I2C_REG_CKH(alg_data));
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iowrite32(tmp, I2C_REG_CKL(alg_data));
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iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data));
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if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) {
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if (wait_reset(alg_data)) {
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ret = -ENODEV;
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goto out_clock;
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}
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@ -710,6 +730,8 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev)
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goto out_irq;
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}
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of_i2c_register_devices(&alg_data->adapter);
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dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
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alg_data->adapter.name, res->start, alg_data->irq);
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@ -748,10 +770,19 @@ static int __devexit i2c_pnx_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id i2c_pnx_of_match[] = {
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{ .compatible = "nxp,pnx-i2c" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, i2c_pnx_of_match);
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#endif
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static struct platform_driver i2c_pnx_driver = {
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.driver = {
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.name = "pnx-i2c",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(i2c_pnx_of_match),
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},
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.probe = i2c_pnx_probe,
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.remove = __devexit_p(i2c_pnx_remove),
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@ -32,6 +32,7 @@ struct i2c_pnx_algo_data {
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struct i2c_adapter adapter;
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phys_addr_t base;
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int irq;
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u32 timeout;
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};
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#endif /* __I2C_PNX_H__ */
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