summaryrefslogtreecommitdiff
path: root/target/linux/xburst/patches-2.6.37/050-i2c.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/xburst/patches-2.6.37/050-i2c.patch')
-rw-r--r--target/linux/xburst/patches-2.6.37/050-i2c.patch472
1 files changed, 0 insertions, 472 deletions
diff --git a/target/linux/xburst/patches-2.6.37/050-i2c.patch b/target/linux/xburst/patches-2.6.37/050-i2c.patch
deleted file mode 100644
index 5cfa9124e0..0000000000
--- a/target/linux/xburst/patches-2.6.37/050-i2c.patch
+++ /dev/null
@@ -1,472 +0,0 @@
-From 5af1734d9fc79c2d08853c703d1edfef2a4cae16 Mon Sep 17 00:00:00 2001
-From: Lars-Peter Clausen <lars@metafoo.de>
-Date: Sun, 5 Sep 2010 03:19:10 +0200
-Subject: [PATCH 10/23] i2c: Add i2c driver for JZ47XX SoCs
-
-This patch adds a driver for the i2c controller found in Ingenic JZ47XX based
-SoCs.
-
-Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
----
- drivers/i2c/busses/Kconfig | 10 +
- drivers/i2c/busses/Makefile | 1 +
- drivers/i2c/busses/i2c-jz47xx.c | 424 +++++++++++++++++++++++++++++++++++++++
- 3 files changed, 435 insertions(+), 0 deletions(-)
- create mode 100644 drivers/i2c/busses/i2c-jz47xx.c
-
---- a/drivers/i2c/busses/Kconfig
-+++ b/drivers/i2c/busses/Kconfig
-@@ -431,6 +431,16 @@ config I2C_IXP2000
- This driver is deprecated and will be dropped soon. Use i2c-gpio
- instead.
-
-+config I2C_JZ47XX
-+ tristate "JZ4740 I2C Interface"
-+ depends on ARCH_JZ4740
-+ help
-+ Say Y here if you want support for the I2C controller found on Ingenic
-+ JZ47XX based SoCs.
-+
-+ This driver can also be built as a module. If so, the module will be
-+ called i2c-jz47xx.
-+
- config I2C_MPC
- tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
- depends on PPC32
---- a/drivers/i2c/busses/Makefile
-+++ b/drivers/i2c/busses/Makefile
-@@ -41,6 +41,7 @@ obj-$(CONFIG_I2C_IMX) += i2c-imx.o
- obj-$(CONFIG_I2C_INTEL_MID) += i2c-intel-mid.o
- obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
- obj-$(CONFIG_I2C_IXP2000) += i2c-ixp2000.o
-+obj-$(CONFIG_I2C_JZ47XX) += i2c-jz47xx.o
- obj-$(CONFIG_I2C_MPC) += i2c-mpc.o
- obj-$(CONFIG_I2C_MV64XXX) += i2c-mv64xxx.o
- obj-$(CONFIG_I2C_NOMADIK) += i2c-nomadik.o
---- /dev/null
-+++ b/drivers/i2c/busses/i2c-jz47xx.c
-@@ -0,0 +1,424 @@
-+
-+#include <linux/init.h>
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/err.h>
-+#include <linux/clk.h>
-+#include <linux/platform_device.h>
-+#include <linux/i2c.h>
-+#include <linux/slab.h>
-+#include <linux/interrupt.h>
-+
-+#include <linux/gpio.h>
-+#include <linux/delay.h>
-+
-+#define JZ47XX_REG_I2C_DATA 0x00
-+#define JZ47XX_REG_I2C_CTRL 0x04
-+#define JZ47XX_REG_I2C_STATUS 0x08
-+#define JZ47XX_REG_I2C_CLOCK 0x0C
-+
-+#define JZ47XX_I2C_STATUS_FIFO_FULL BIT(4)
-+#define JZ47XX_I2C_STATUS_BUSY BIT(3)
-+#define JZ47XX_I2C_STATUS_TEND BIT(2)
-+#define JZ47XX_I2C_STATUS_DATA_VALID BIT(1)
-+#define JZ47XX_I2C_STATUS_NACK BIT(0)
-+
-+#define JZ47XX_I2C_CTRL_IRQ_ENABLE BIT(4)
-+#define JZ47XX_I2C_CTRL_START BIT(3)
-+#define JZ47XX_I2C_CTRL_STOP BIT(2)
-+#define JZ47XX_I2C_CTRL_NACK BIT(1)
-+#define JZ47XX_I2C_CTRL_ENABLE BIT(0)
-+
-+struct jz47xx_i2c {
-+ struct resource *mem;
-+ void __iomem *base;
-+ int irq;
-+ struct clk *clk;
-+
-+ struct i2c_adapter adapter;
-+
-+ wait_queue_head_t wait_queue;
-+};
-+
-+static inline struct jz47xx_i2c *adapter_to_jz47xx_i2c(struct i2c_adapter *adap)
-+{
-+ return container_of(adap, struct jz47xx_i2c, adapter);
-+}
-+
-+static inline void jz47xx_i2c_set_ctrl(struct jz47xx_i2c *jz47xx_i2c,
-+ uint8_t mask, uint8_t value)
-+{
-+ uint8_t ctrl;
-+ ctrl = readb(jz47xx_i2c->base + JZ47XX_REG_I2C_CTRL);
-+ ctrl &= ~mask;
-+ ctrl |= value;
-+ printk("ctrl: %x\n", ctrl);
-+ writeb(ctrl, jz47xx_i2c->base + JZ47XX_REG_I2C_CTRL);
-+}
-+
-+static irqreturn_t jz47xx_i2c_irq_handler(int irq, void *devid)
-+{
-+ struct jz47xx_i2c *jz47xx_i2c = devid;
-+
-+ printk("IRQ\n");
-+
-+ wake_up(&jz47xx_i2c->wait_queue);
-+
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_IRQ_ENABLE, 0);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static inline void jz47xx_i2c_set_data_valid(struct jz47xx_i2c *jz47xx_i2c,
-+ bool valid)
-+{
-+ uint8_t val;
-+ val = readb(jz47xx_i2c->base + JZ47XX_REG_I2C_STATUS);
-+ if (valid)
-+ val |= JZ47XX_I2C_STATUS_DATA_VALID;
-+ else
-+ val &= ~JZ47XX_I2C_STATUS_DATA_VALID;
-+ writeb(val, jz47xx_i2c->base + JZ47XX_REG_I2C_STATUS);
-+}
-+
-+static int jz47xx_i2c_test_event(struct jz47xx_i2c *jz47xx_i2c, uint8_t mask, uint8_t value)
-+{
-+ uint8_t status;
-+
-+ mask |= JZ47XX_I2C_STATUS_NACK;
-+ value |= JZ47XX_I2C_STATUS_NACK;
-+
-+ status = readb(jz47xx_i2c->base + JZ47XX_REG_I2C_STATUS);
-+ printk("status: %x %x %x %x\n", status, mask, value, (status & mask) ^
-+ value);
-+ if (((status & mask) ^ value) == mask) {
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_IRQ_ENABLE,
-+ JZ47XX_I2C_CTRL_IRQ_ENABLE);
-+ return 0;
-+ }
-+ return 1;
-+}
-+
-+static int jz47xx_i2c_wait_event_or_nack(struct jz47xx_i2c *jz47xx_i2c, uint8_t
-+mask, uint8_t value)
-+{
-+ int ret;
-+
-+ ret = wait_event_interruptible_timeout(jz47xx_i2c->wait_queue,
-+ jz47xx_i2c_test_event(jz47xx_i2c, mask, value), 30 * HZ);
-+
-+/* while (!jz47xx_i2c_test_event(jz47xx_i2c, mask, value));
-+
-+ ret = 1;*/
-+
-+ printk("wait event or nack: %d %x\n", ret, readb(jz47xx_i2c->base +
-+ JZ47XX_REG_I2C_STATUS));
-+
-+ if (ret == 0)
-+ ret = -ETIMEDOUT;
-+ else if(ret > 0) {
-+ if (readb(jz47xx_i2c->base + JZ47XX_REG_I2C_STATUS) & JZ47XX_I2C_STATUS_NACK)
-+ ret = -EIO;
-+ else
-+ ret = 0;
-+ }
-+
-+ return ret;
-+}
-+
-+static int jz47xx_i2c_wait_event(struct jz47xx_i2c *jz47xx_i2c, uint8_t event)
-+{
-+ int ret;
-+
-+ ret = wait_event_interruptible_timeout(jz47xx_i2c->wait_queue,
-+ jz47xx_i2c_test_event(jz47xx_i2c, event, event), 30 * HZ);
-+
-+ if (ret == 0)
-+ ret = -ETIMEDOUT;
-+ else if(ret > 0)
-+ ret = 0;
-+
-+ return ret;
-+}
-+
-+
-+static int jz47xx_i2c_write_msg(struct jz47xx_i2c *jz47xx_i2c,
-+ struct i2c_msg *msg)
-+{
-+ int ret;
-+ int i;
-+
-+ printk("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
-+ for (i = 0; i < msg->len; ++i) {
-+ writeb(msg->buf[i], jz47xx_i2c->base + JZ47XX_REG_I2C_DATA);
-+ jz47xx_i2c_set_data_valid(jz47xx_i2c, true);
-+ ret = jz47xx_i2c_wait_event_or_nack(jz47xx_i2c,
-+ JZ47XX_I2C_STATUS_DATA_VALID, 0);
-+ if (ret)
-+ break;
-+ }
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_STOP,
-+ JZ47XX_I2C_CTRL_STOP);
-+
-+ if (!ret)
-+ ret = jz47xx_i2c_wait_event_or_nack(jz47xx_i2c, JZ47XX_I2C_STATUS_TEND,
-+ JZ47XX_I2C_STATUS_TEND);
-+
-+ return ret;
-+}
-+
-+static int jz47xx_i2c_read_msg(struct jz47xx_i2c *jz47xx_i2c,
-+ struct i2c_msg *msg)
-+{
-+ int i;
-+ int ret;
-+ printk("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
-+
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_NACK,
-+ msg->len == 1 ? JZ47XX_I2C_CTRL_NACK : 0);
-+
-+ for (i = 0; i < msg->len; ++i) {
-+ ret = jz47xx_i2c_wait_event(jz47xx_i2c, JZ47XX_I2C_STATUS_DATA_VALID);
-+ if (ret) {
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_NACK,
-+ JZ47XX_I2C_CTRL_NACK);
-+ break;
-+ }
-+
-+ if (i == msg->len - 2) {
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_NACK,
-+ JZ47XX_I2C_CTRL_NACK);
-+ }
-+
-+ msg->buf[i] = readb(jz47xx_i2c->base + JZ47XX_REG_I2C_DATA);
-+ printk("read: %x\n", msg->buf[i]);
-+ jz47xx_i2c_set_data_valid(jz47xx_i2c, false);
-+ }
-+
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_STOP,
-+ JZ47XX_I2C_CTRL_STOP);
-+
-+ return ret;
-+}
-+
-+static int jz47xx_i2c_xfer_msg(struct jz47xx_i2c *jz47xx_i2c,
-+ struct i2c_msg *msg)
-+{
-+ uint8_t addr;
-+ int ret;
-+
-+ addr = msg->addr << 1;
-+ if (msg->flags & I2C_M_RD)
-+ addr |= 1;
-+
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, JZ47XX_I2C_CTRL_START,
-+ JZ47XX_I2C_CTRL_START);
-+ writeb(addr, jz47xx_i2c->base + JZ47XX_REG_I2C_DATA);
-+ jz47xx_i2c_set_data_valid(jz47xx_i2c, true);
-+
-+ if (msg->flags & I2C_M_RD) {
-+ printk("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
-+ ret = jz47xx_i2c_wait_event_or_nack(jz47xx_i2c,
-+ JZ47XX_I2C_STATUS_TEND, JZ47XX_I2C_STATUS_TEND);
-+ if (!ret)
-+ ret = jz47xx_i2c_read_msg(jz47xx_i2c, msg);
-+ } else {
-+ printk("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
-+ ret = jz47xx_i2c_wait_event_or_nack(jz47xx_i2c,
-+ JZ47XX_I2C_STATUS_DATA_VALID, 0);
-+ if (!ret)
-+ ret = jz47xx_i2c_write_msg(jz47xx_i2c, msg);
-+ }
-+
-+ return ret;
-+}
-+
-+static int jz47xx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int
-+num)
-+{
-+ struct jz47xx_i2c *jz47xx_i2c = adapter_to_jz47xx_i2c(adap);
-+ int ret = 0;
-+ int i;
-+ int mask = JZ47XX_I2C_CTRL_ENABLE;
-+
-+ printk("xfer: %d %x\n", num, readb(jz47xx_i2c->base +
-+ JZ47XX_REG_I2C_STATUS));
-+
-+ clk_enable(jz47xx_i2c->clk);
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, mask, mask);
-+
-+ for (i = 0; i < num; ++i) {
-+ ret = jz47xx_i2c_xfer_msg(jz47xx_i2c, &msgs[i]);
-+ if (ret)
-+ break;
-+ }
-+
-+ jz47xx_i2c_set_ctrl(jz47xx_i2c, mask, 0);
-+ clk_disable(jz47xx_i2c->clk);
-+
-+ printk("xfer ret: %d\n", ret);
-+
-+ return ret;
-+}
-+
-+static u32 jz47xx_i2c_functionality(struct i2c_adapter *adap)
-+{
-+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-+}
-+
-+static const struct i2c_algorithm jz47xx_i2c_algorithm = {
-+ .master_xfer = jz47xx_i2c_xfer,
-+ .functionality = jz47xx_i2c_functionality,
-+};
-+
-+const static struct jz_gpio_bulk_request jz47xx_i2c_pins[] = {
-+ JZ_GPIO_BULK_PIN(I2C_SDA),
-+ JZ_GPIO_BULK_PIN(I2C_SCK),
-+};
-+
-+static int __devinit jz47xx_i2c_probe(struct platform_device *pdev)
-+{
-+ struct jz47xx_i2c *jz47xx_i2c;
-+ struct resource *mem;
-+ void __iomem *base;
-+ struct clk *clk;
-+ int irq;
-+ int ret;
-+
-+ irq = platform_get_irq(pdev, 0);
-+ if (!irq) {
-+ dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
-+ return irq;
-+ }
-+
-+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ if (!mem) {
-+ dev_err(&pdev->dev, "Failed to get iomem region\n");
-+ return -ENXIO;
-+ }
-+
-+ mem = request_mem_region(mem->start, resource_size(mem), pdev->name);
-+ if (!mem) {
-+ dev_err(&pdev->dev, "Failed to request iomem region\n");
-+ return -EBUSY;
-+ }
-+
-+ base = ioremap(mem->start, resource_size(mem));
-+ if (!base) {
-+ dev_err(&pdev->dev, "Failed to ioremap iomem\n");
-+ ret = -EBUSY;
-+ goto err_release_mem_region;
-+ }
-+
-+ clk = clk_get(&pdev->dev, "i2c");
-+ if (IS_ERR(clk)) {
-+ ret = PTR_ERR(clk);
-+ goto err_iounmap;
-+ }
-+
-+ jz47xx_i2c = kzalloc(sizeof(*jz47xx_i2c), GFP_KERNEL);
-+ if (!jz47xx_i2c) {
-+ ret = -ENOMEM;
-+ goto err_clk_put;
-+ }
-+
-+ jz47xx_i2c->adapter.owner = THIS_MODULE;
-+ jz47xx_i2c->adapter.algo = &jz47xx_i2c_algorithm;
-+ jz47xx_i2c->adapter.dev.parent = &pdev->dev;
-+ jz47xx_i2c->adapter.nr = pdev->id < 0 ?: 0;
-+ strcpy(jz47xx_i2c->adapter.name, pdev->name);
-+
-+ jz47xx_i2c->mem = mem;
-+ jz47xx_i2c->base = base;
-+ jz47xx_i2c->clk = clk;
-+ jz47xx_i2c->irq = irq;
-+
-+ init_waitqueue_head(&jz47xx_i2c->wait_queue);
-+
-+ ret = request_irq(irq, jz47xx_i2c_irq_handler, 0, pdev->name, jz47xx_i2c);
-+ if (ret) {
-+ dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
-+ goto err_free;
-+ }
-+
-+ ret = jz_gpio_bulk_request(jz47xx_i2c_pins, ARRAY_SIZE(jz47xx_i2c_pins));
-+ if (ret) {
-+ dev_err(&pdev->dev, "Failed to request i2c pins: %d\n", ret);
-+ goto err_free_irq;
-+ }
-+
-+ writew(0x10, jz47xx_i2c->base + JZ47XX_REG_I2C_CLOCK);
-+
-+ ret = i2c_add_numbered_adapter(&jz47xx_i2c->adapter);
-+ if (ret) {
-+ dev_err(&pdev->dev, "Failed to add i2c adapter: %d\n", ret);
-+ goto err_free_gpios;
-+ }
-+
-+ platform_set_drvdata(pdev, jz47xx_i2c);
-+
-+ printk("JZ4740 I2C\n");
-+
-+ return 0;
-+
-+err_free_gpios:
-+ jz_gpio_bulk_free(jz47xx_i2c_pins, ARRAY_SIZE(jz47xx_i2c_pins));
-+err_free_irq:
-+ free_irq(irq, jz47xx_i2c);
-+err_free:
-+ kfree(jz47xx_i2c);
-+err_clk_put:
-+ clk_put(clk);
-+err_iounmap:
-+ iounmap(base);
-+err_release_mem_region:
-+ release_mem_region(mem->start, resource_size(mem));
-+ return ret;
-+}
-+
-+static int __devexit jz47xx_i2c_remove(struct platform_device *pdev)
-+{
-+ struct jz47xx_i2c *jz47xx_i2c = platform_get_drvdata(pdev);
-+
-+ platform_set_drvdata(pdev, NULL);
-+ i2c_del_adapter(&jz47xx_i2c->adapter);
-+
-+ jz_gpio_bulk_free(jz47xx_i2c_pins, ARRAY_SIZE(jz47xx_i2c_pins));
-+
-+ free_irq(jz47xx_i2c->irq, jz47xx_i2c);
-+ clk_put(jz47xx_i2c->clk);
-+
-+ iounmap(jz47xx_i2c->base);
-+ release_mem_region(jz47xx_i2c->mem->start, resource_size(jz47xx_i2c->mem));
-+
-+ kfree(jz47xx_i2c);
-+
-+ return 0;
-+}
-+
-+static struct platform_driver jz47xx_i2c_driver = {
-+ .probe = jz47xx_i2c_probe,
-+ .remove = jz47xx_i2c_remove,
-+ .driver = {
-+ .name = "jz47xx-i2c",
-+ .owner = THIS_MODULE,
-+ },
-+};
-+
-+static int __init jz47xx_i2c_init(void)
-+{
-+ return platform_driver_register(&jz47xx_i2c_driver);
-+}
-+module_init(jz47xx_i2c_init);
-+
-+static void jz47xx_i2c_exit(void)
-+{
-+ platform_driver_unregister(&jz47xx_i2c_driver);
-+}
-+module_exit(jz47xx_i2c_exit);
-+
-+MODULE_LICENSE("GPL");
-+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-+MODULE_DESCRIPTION("I2C adapter driver for JZ47XX SoCs");
-+MODULE_ALIAS("platform:jz47xx-i2c");
-+
generated by cgit v1.2.3 (git 2.46.0) at 2024-12-25 17:58:07 +0000