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Subject[PATCHv2 2/3] sunxi:drivers:input:ps2 Added sunxi A10/A20 ps2 driver
Date
 -added compatible as allwinner,sun4i-a10-ps2 and allwinner,sun7i-a20-ps2.
- added default n depends on ARCH_SUNXI || COMPILE_TEST
in Kconfig.
-handled errors and free resources on errors.
-used BIT(x), DIV_ROUND_UP macros.
-corrected style errors.

Signed-off-by: vishnupatekar <VishnuPatekar0510@gmail.com>
---
drivers/input/serio/Kconfig | 10 ++
drivers/input/serio/Makefile | 1 +
drivers/input/serio/sunxi-ps2.c | 364 +++++++++++++++++++++++++++++++++++++++
3 files changed, 375 insertions(+)
create mode 100644 drivers/input/serio/sunxi-ps2.c

diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index bc2d474..3a7599c 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -281,4 +281,14 @@ config HYPERV_KEYBOARD
To compile this driver as a module, choose M here: the module will
be called hyperv_keyboard.

+config SERIO_SUNXI_PS2
+ tristate "Allwinner Sun4i-A10/Sun7i-A20 PS/2 controller"
+ default n
+ depends on ARCH_SUNXI || COMPILE_TEST
+ help
+ Say Y here if you have Sun4i-A10/Sun7i-A20 Allwinner PS/2 ports.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sunxi-ps2.
+
endif
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index 815d874..0fa0f78 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -29,3 +29,4 @@ obj-$(CONFIG_SERIO_ARC_PS2) += arc_ps2.o
obj-$(CONFIG_SERIO_APBPS2) += apbps2.o
obj-$(CONFIG_SERIO_OLPC_APSP) += olpc_apsp.o
obj-$(CONFIG_HYPERV_KEYBOARD) += hyperv-keyboard.o
+obj-$(CONFIG_SERIO_SUNXI_PS2) += sunxi-ps2.o
diff --git a/drivers/input/serio/sunxi-ps2.c b/drivers/input/serio/sunxi-ps2.c
new file mode 100644
index 0000000..4cd89ae
--- /dev/null
+++ b/drivers/input/serio/sunxi-ps2.c
@@ -0,0 +1,364 @@
+/*
+ * Driver for Allwinner A20 PS2 host controller
+ *
+ * Author: Vishnu Patekar <vishnupatekar0510@gmail.com>
+ * Aaron.maoye <leafy.myeh@newbietech.com>
+ *
+ * Based on 3.0 kernel
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/serio.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#define DRIVER_NAME "sunxi-ps2"
+
+/* register offset definitions */
+#define PS2_REG_GCTL (0x00) /* PS2 Module Global Control Reg */
+#define PS2_REG_DATA (0x04) /* PS2 Module Data Reg */
+#define PS2_REG_LCTL (0x08) /* PS2 Module Line Control Reg */
+#define PS2_REG_LSTS (0x0C) /* PS2 Module Line Status Reg */
+#define PS2_REG_FCTL (0x10) /* PS2 Module FIFO Control Reg */
+#define PS2_REG_FSTS (0x14) /* PS2 Module FIFO Status Reg */
+#define PS2_REG_CLKDR (0x18) /* PS2 Module Clock Divider Reg*/
+
+/* PS2 GLOBAL CONTROL REGISTER PS2_GCTL */
+#define PS2_GCTL_INTFLAG BIT(4)
+#define PS2_GCTL_INTEN BIT(3)
+#define PS2_GCTL_RESET BIT(2)
+#define PS2_GCTL_MASTER BIT(1)
+#define PS2_GCTL_BUSEN BIT(0)
+
+/* PS2 LINE CONTROL REGISTER */
+#define PS2_LCTL_NOACK BIT(18)
+#define PS2_LCTL_TXDTOEN BIT(8)
+#define PS2_LCTL_STOPERREN BIT(3)
+#define PS2_LCTL_ACKERREN BIT(2)
+#define PS2_LCTL_PARERREN BIT(1)
+#define PS2_LCTL_RXDTOEN BIT(0)
+
+/* PS2 LINE STATUS REGISTER */
+#define PS2_LSTS_TXTDO BIT(8)
+#define PS2_LSTS_STOPERR BIT(3)
+#define PS2_LSTS_ACKERR BIT(2)
+#define PS2_LSTS_PARERR BIT(1)
+#define PS2_LSTS_RXTDO BIT(0)
+
+/* PS2 FIFO CONTROL REGISTER */
+#define PS2_FCTL_TXRST BIT(17)
+#define PS2_FCTL_RXRST BIT(16)
+#define PS2_FCTL_TXUFIEN BIT(10)
+#define PS2_FCTL_TXOFIEN BIT(9)
+#define PS2_FCTL_TXRDYIEN BIT(8)
+#define PS2_FCTL_RXUFIEN BIT(2)
+#define PS2_FCTL_RXOFIEN BIT(1)
+#define PS2_FCTL_RXRDYIEN BIT(0)
+
+/* PS2 FIFO STATUS REGISTER */
+#define PS2_FSTS_TXUF BIT(10)
+#define PS2_FSTS_TXOF BIT(9)
+#define PS2_FSTS_TXRDY BIT(8)
+#define PS2_FSTS_RXUF BIT(2)
+#define PS2_FSTS_RXOF BIT(1)
+#define PS2_FSTS_RXRDY BIT(0)
+
+
+#define PS2_LINE_ERROR_BIT \
+ (PS2_LSTS_TXTDO|PS2_LSTS_STOPERR|PS2_LSTS_ACKERR| \
+ PS2_LSTS_PARERR|PS2_LSTS_RXTDO)
+
+#define PS2_FIFO_ERROR_BIT \
+ (PS2_FSTS_TXUF|PS2_FSTS_TXOF|PS2_FSTS_TXRDY|PS2_FSTS_RXUF| \
+ PS2_FSTS_RXOF|PS2_FSTS_RXRDY)
+
+#define PS2_SAMPLE_CLK (1000000)
+#define PS2_SCLK (125000)
+
+struct sunxips2data {
+ struct serio *serio;
+ struct device *dev;
+
+ /* IO mapping base */
+ void __iomem *reg_base;
+
+ /* clock management */
+ struct clk *clk;
+
+ /* irq */
+ spinlock_t lock;
+ int irq;
+};
+
+/*********************/
+/* Interrupt handler */
+/*********************/
+static irqreturn_t sunxips2_interrupt(int irq, void *dev_id)
+{
+ struct sunxips2data *drvdata = dev_id;
+ u32 intr_status;
+ u32 fifo_status;
+ unsigned char byte;
+ u32 rval;
+ u32 error = 0;
+
+ spin_lock(&drvdata->lock);
+
+ /* Get the PS/2 interrupts and clear them */
+ intr_status = readl(drvdata->reg_base + PS2_REG_LSTS);
+ fifo_status = readl(drvdata->reg_base + PS2_REG_FSTS);
+
+ /*Check Line Status Register*/
+ if (intr_status & 0x10f) {
+ if (intr_status & PS2_LSTS_STOPERR)
+ dev_info(drvdata->dev, "PS/2 Stop Bit Error!");
+ if (intr_status & PS2_LSTS_ACKERR)
+ dev_info(drvdata->dev, "PS/2 Acknowledge Error!\n");
+ if (intr_status & PS2_LSTS_PARERR)
+ dev_info(drvdata->dev, "PS/2 Parity Error!\n");
+ if (intr_status & PS2_LSTS_TXTDO)
+ dev_info(drvdata->dev, "PS/2 Transmit Data Timeout!\n");
+ if (intr_status & PS2_LSTS_RXTDO)
+ dev_info(drvdata->dev, "PS/2 Receive Data Timeout!\n");
+
+ /*reset PS/2 controller*/
+ writel(readl(drvdata->reg_base + PS2_REG_GCTL) | PS2_GCTL_RESET,
+ drvdata->reg_base + PS2_REG_GCTL);
+
+ rval = PS2_LSTS_TXTDO | PS2_LSTS_STOPERR | PS2_LSTS_ACKERR |
+ PS2_LSTS_PARERR | PS2_LSTS_RXTDO;
+ writel(rval, drvdata->reg_base + PS2_REG_LSTS);
+ error = 1;
+ }
+
+ /*Check FIFO Status Register*/
+ if (fifo_status & 0x0606) {
+ if (fifo_status & PS2_FSTS_TXUF)
+ dev_info(drvdata->dev, "PS/2 Tx FIFO Underflow!\n");
+ if (fifo_status & PS2_FSTS_TXOF)
+ dev_info(drvdata->dev, "PS/2 Tx FIFO Overflow!\n");
+ if (fifo_status & PS2_FSTS_RXUF)
+ dev_info(drvdata->dev, "PS/2 Rx FIFO Underflow!\n");
+ if (fifo_status & PS2_FSTS_RXOF)
+ dev_info(drvdata->dev, "PS/2 Rx FIFO Overflow!\n");
+ /*reset PS/2 controller*/
+ writel(readl(drvdata->reg_base + PS2_REG_GCTL) | PS2_GCTL_RESET,
+ drvdata->reg_base + PS2_REG_GCTL);
+
+ rval = PS2_FSTS_TXUF | PS2_FSTS_TXOF | PS2_FSTS_TXRDY |
+ PS2_FSTS_RXUF | PS2_FSTS_RXOF | PS2_FSTS_RXRDY;
+ writel(rval, drvdata->reg_base + PS2_REG_FSTS);
+ error = 1;
+ }
+
+ rval = (fifo_status >> 16) & 0x3;
+ while (!error && rval--) {
+ byte = readl(drvdata->reg_base + PS2_REG_DATA) & 0xff;
+ /* dev_info(drvdata->dev, "PS/2 Receive %02x\n", byte); */
+ serio_interrupt(drvdata->serio, byte, 0);
+ }
+
+ writel(intr_status, drvdata->reg_base + PS2_REG_LSTS);
+ writel(fifo_status, drvdata->reg_base + PS2_REG_FSTS);
+
+ spin_unlock(&drvdata->lock);
+
+ return IRQ_HANDLED;
+}
+
+
+static int sunxips2_open(struct serio *pserio)
+{
+ struct sunxips2data *drvdata = pserio->port_data;
+ u32 src_clk = 0;
+ u32 clk_scdf;
+ u32 clk_pcdf;
+ u32 rval;
+
+ /*Set Line Control And Enable Interrupt*/
+ rval = PS2_LCTL_TXDTOEN | PS2_LCTL_STOPERREN | PS2_LCTL_ACKERREN
+ | PS2_LCTL_PARERREN | PS2_LCTL_RXDTOEN;
+ writel(rval, drvdata->reg_base + PS2_REG_LCTL);
+
+ /*Reset FIFO*/
+ rval = PS2_FCTL_TXRST|PS2_FCTL_RXRST|PS2_FCTL_TXUFIEN|PS2_FCTL_TXOFIEN
+ |PS2_FCTL_RXUFIEN|PS2_FCTL_RXOFIEN|PS2_FCTL_RXRDYIEN;
+ writel(rval, drvdata->reg_base + PS2_REG_FCTL);
+
+ src_clk = clk_get_rate(drvdata->clk);
+
+ if (!src_clk) {
+ dev_info(drvdata->dev, "w_ps2c_set_sclk error, source clock is 0.");
+ return -1;
+ }
+
+ /*Set Clock Divider Register*/
+ clk_scdf = DIV_ROUND_UP(src_clk, PS2_SAMPLE_CLK) - 1;
+ clk_pcdf = DIV_ROUND_UP(PS2_SAMPLE_CLK, PS2_SCLK) - 1;
+ rval = (clk_scdf<<8) | clk_pcdf;
+ writel(rval, drvdata->reg_base + PS2_REG_CLKDR);
+
+ /*Set Global Control Register*/
+ rval = PS2_GCTL_RESET | PS2_GCTL_INTEN | PS2_GCTL_MASTER
+ | PS2_GCTL_BUSEN;
+ writel(rval, drvdata->reg_base + PS2_REG_GCTL);
+
+ return 0;
+}
+
+static void sunxips2_close(struct serio *pserio)
+{
+ struct sunxips2data *drvdata = pserio->port_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&drvdata->lock, flags);
+ /* Disable the PS2 interrupts */
+ writel(0, drvdata->reg_base + PS2_REG_GCTL);
+ spin_unlock_irqrestore(&drvdata->lock, flags);
+}
+
+static int sunxips2_write(struct serio *pserio, unsigned char val)
+{
+ unsigned long expire = jiffies + msecs_to_jiffies(10000);
+ struct sunxips2data *drvdata = (struct sunxips2data *)pserio->port_data;
+
+ do {
+ if (readl(drvdata->reg_base + PS2_REG_FSTS) & PS2_FSTS_TXRDY) {
+ writel(val, drvdata->reg_base + PS2_REG_DATA);
+ return 0;
+ }
+ } while (time_before(jiffies, expire));
+
+ return 0;
+}
+
+static int sunxips2_probe(struct platform_device *pdev)
+{
+ struct resource *res; /* IO mem resources */
+ struct sunxips2data *drvdata;
+ struct serio *serio;
+ struct device *dev = &pdev->dev;
+ unsigned int irq;
+ int error;
+
+ drvdata = devm_kzalloc(dev, sizeof(struct sunxips2data), GFP_KERNEL);
+ serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
+ if (!drvdata || !serio) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ spin_lock_init(&drvdata->lock);
+
+ /* IO */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ drvdata->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(drvdata->reg_base)) {
+ dev_err(dev, "failed to map registers\n");
+ error = PTR_ERR(drvdata->reg_base);
+ goto err_free_mem;
+ }
+
+ drvdata->clk = devm_clk_get(dev, NULL);
+ if (!IS_ERR(drvdata->clk)) {
+ error = clk_prepare_enable(drvdata->clk);
+ if (error < 0) {
+ dev_err(dev, "failed to enable clock %d\n", error);
+ goto err_free_mem;
+ }
+ } else {
+ error = PTR_ERR(drvdata->clk);
+ dev_err(dev, "couldn't get clock %d\n", error);
+ goto err_free_mem;
+ }
+
+ serio->id.type = SERIO_8042;
+ serio->write = sunxips2_write;
+ serio->open = sunxips2_open;
+ serio->close = sunxips2_close;
+ serio->port_data = drvdata;
+ serio->dev.parent = dev;
+ strlcpy(serio->name, dev_name(dev), sizeof(serio->name));
+ strlcpy(serio->phys, dev_name(dev), sizeof(serio->phys));
+
+ /* Get IRQ for the device */
+ irq = platform_get_irq(pdev, 0);
+ if (!irq) {
+ dev_err(dev, "no IRQ found\n");
+ error = -ENXIO;
+ goto error_disable_clk;
+ }
+
+ drvdata->irq = irq;
+ drvdata->serio = serio;
+ drvdata->dev = dev;
+ error = devm_request_threaded_irq(dev, drvdata->irq,
+ sunxips2_interrupt, NULL, 0, DRIVER_NAME, drvdata);
+
+ if (error) {
+ dev_err(drvdata->dev, "Interrupt alloc failed %d:error:%d\n",
+ drvdata->irq, error);
+ goto error_disable_clk;
+ }
+
+ serio_register_port(serio);
+ platform_set_drvdata(pdev, drvdata);
+
+ return 0; /* success */
+
+error_disable_clk:
+ clk_disable_unprepare(drvdata->clk);
+
+err_free_mem:
+ kfree(serio);
+ return error;
+}
+
+static int sunxips2_remove(struct platform_device *pdev)
+{
+ struct sunxips2data *drvdata = platform_get_drvdata(pdev);
+
+ serio_unregister_port(drvdata->serio);
+ disable_irq(drvdata->irq);
+
+ if (!IS_ERR(drvdata->clk))
+ clk_disable_unprepare(drvdata->clk);
+ kfree(drvdata->serio);
+
+ return 0;
+}
+
+/* Match table for of_platform binding */
+static const struct of_device_id sunxips2_of_match[] = {
+ { .compatible = "allwinner,sun7i-a20-ps2", },
+ { .compatible = "allwinner,sun4i-a10-ps2", },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, sunxips2_of_match);
+
+/*platform driver structure*/
+static struct platform_driver sunxips2_of_driver = {
+ .probe = sunxips2_probe,
+ .remove = sunxips2_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = sunxips2_of_match,
+ },
+};
+module_platform_driver(sunxips2_of_driver);
+
+MODULE_AUTHOR("Vishnu Patekar <vishnupatekar0510@gmail.com>");
+MODULE_AUTHOR("Aaron.maoye <leafy.myeh@newbietech.com>");
+MODULE_DESCRIPTION("Sunxi PS/2 driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5


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