Marc Gonzalez <marc_gonza...@sigmadesigns.com> writes:
> From: Mans Rullgard <m...@mansr.com>
>
> The tango HW IR decoder supports NEC, RC-5, RC-6 protocols.
>
> Signed-off-by: Marc Gonzalez <marc_gonza...@sigmadesigns.com>
I could continue nit-picking, but I think this is good enough. Thanks
for being patient.
Signed-off-by: Mans Rullgard <m...@mansr.com>
> ---
> Changes between v5 and v6
> * Move "register fields" macros to top of file
> * Restore IRQ pending writes
> ---
> drivers/media/rc/Kconfig | 10 ++
> drivers/media/rc/Makefile | 1 +
> drivers/media/rc/tango-ir.c | 279
> ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 290 insertions(+)
> create mode 100644 drivers/media/rc/tango-ir.c
>
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index d9ce8ff55d0c..e80d4362e769 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -469,6 +469,16 @@ config IR_SIR
> To compile this driver as a module, choose M here: the module will
> be called sir-ir.
>
> +config IR_TANGO
> + tristate "Sigma Designs SMP86xx IR decoder"
> + depends on RC_CORE
> + depends on ARCH_TANGO || COMPILE_TEST
> + ---help---
> + Adds support for the HW IR decoder embedded on Sigma Designs
> + Tango-based systems (SMP86xx, SMP87xx).
> + The HW decoder supports NEC, RC-5, RC-6 IR protocols.
> + When compiled as a module, look for tango-ir.
> +
> config IR_ZX
> tristate "ZTE ZX IR remote control"
> depends on RC_CORE
> diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
> index 9bc6a3980ed0..643797dc971b 100644
> --- a/drivers/media/rc/Makefile
> +++ b/drivers/media/rc/Makefile
> @@ -44,3 +44,4 @@ obj-$(CONFIG_IR_SERIAL) += serial_ir.o
> obj-$(CONFIG_IR_SIR) += sir_ir.o
> obj-$(CONFIG_IR_MTK) += mtk-cir.o
> obj-$(CONFIG_IR_ZX) += zx-irdec.o
> +obj-$(CONFIG_IR_TANGO) += tango-ir.o
> diff --git a/drivers/media/rc/tango-ir.c b/drivers/media/rc/tango-ir.c
> new file mode 100644
> index 000000000000..1bd4e3412a29
> --- /dev/null
> +++ b/drivers/media/rc/tango-ir.c
> @@ -0,0 +1,279 @@
> +/*
> + * Copyright (C) 2015 Mans Rullgard <m...@mansr.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + */
> +
> +#include <linux/input.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/clk.h>
> +#include <linux/of.h>
> +#include <media/rc-core.h>
> +
> +#define DRIVER_NAME "tango-ir"
> +
> +#define IR_NEC_CTRL 0x00
> +#define IR_NEC_DATA 0x04
> +#define IR_CTRL 0x08
> +#define IR_RC5_CLK_DIV 0x0c
> +#define IR_RC5_DATA 0x10
> +#define IR_INT 0x14
> +
> +#define NEC_TIME_BASE 560
> +#define RC5_TIME_BASE 1778
> +
> +#define RC6_CTRL 0x00
> +#define RC6_CLKDIV 0x04
> +#define RC6_DATA0 0x08
> +#define RC6_DATA1 0x0c
> +#define RC6_DATA2 0x10
> +#define RC6_DATA3 0x14
> +#define RC6_DATA4 0x18
> +
> +#define RC6_CARRIER 36000
> +#define RC6_TIME_BASE 16
> +
> +#define NEC_CAP(n) ((n) << 24)
> +#define GPIO_SEL(n) ((n) << 16)
> +#define DISABLE_NEC (BIT(4) | BIT(8))
> +#define ENABLE_RC5 (BIT(0) | BIT(9))
> +#define ENABLE_RC6 (BIT(0) | BIT(7))
> +#define ACK_IR_INT (BIT(0) | BIT(1))
> +#define ACK_RC6_INT (BIT(31))
> +
> +struct tango_ir {
> + void __iomem *rc5_base;
> + void __iomem *rc6_base;
> + struct rc_dev *rc;
> + struct clk *clk;
> +};
> +
> +static void tango_ir_handle_nec(struct tango_ir *ir)
> +{
> + u32 v, code;
> + enum rc_proto proto;
> +
> + v = readl_relaxed(ir->rc5_base + IR_NEC_DATA);
> + if (!v) {
> + rc_repeat(ir->rc);
> + return;
> + }
> +
> + code = ir_nec_bytes_to_scancode(v, v >> 8, v >> 16, v >> 24, &proto);
> + rc_keydown(ir->rc, proto, code, 0);
> +}
> +
> +static void tango_ir_handle_rc5(struct tango_ir *ir)
> +{
> + u32 data, field, toggle, addr, cmd, code;
> +
> + data = readl_relaxed(ir->rc5_base + IR_RC5_DATA);
> + if (data & BIT(31))
> + return;
> +
> + field = data >> 12 & 1;
> + toggle = data >> 11 & 1;
> + addr = data >> 6 & 0x1f;
> + cmd = (data & 0x3f) | (field ^ 1) << 6;
> +
> + code = RC_SCANCODE_RC5(addr, cmd);
> + rc_keydown(ir->rc, RC_PROTO_RC5, code, toggle);
> +}
> +
> +static void tango_ir_handle_rc6(struct tango_ir *ir)
> +{
> + u32 data0, data1, toggle, mode, addr, cmd, code;
> +
> + data0 = readl_relaxed(ir->rc6_base + RC6_DATA0);
> + data1 = readl_relaxed(ir->rc6_base + RC6_DATA1);
> +
> + mode = data0 >> 1 & 7;
> + if (mode != 0)
> + return;
> +
> + toggle = data0 & 1;
> + addr = data0 >> 16;
> + cmd = data1;
> +
> + code = RC_SCANCODE_RC6_0(addr, cmd);
> + rc_keydown(ir->rc, RC_PROTO_RC6_0, code, toggle);
> +}
> +
> +static irqreturn_t tango_ir_irq(int irq, void *dev_id)
> +{
> + struct tango_ir *ir = dev_id;
> + unsigned int rc5_stat;
> + unsigned int rc6_stat;
> +
> + rc5_stat = readl_relaxed(ir->rc5_base + IR_INT);
> + writel_relaxed(rc5_stat, ir->rc5_base + IR_INT);
> +
> + rc6_stat = readl_relaxed(ir->rc6_base + RC6_CTRL);
> + writel_relaxed(rc6_stat, ir->rc6_base + RC6_CTRL);
> +
> + if (!(rc5_stat & 3) && !(rc6_stat & BIT(31)))
> + return IRQ_NONE;
> +
> + if (rc5_stat & BIT(0))
> + tango_ir_handle_rc5(ir);
> +
> + if (rc5_stat & BIT(1))
> + tango_ir_handle_nec(ir);
> +
> + if (rc6_stat & BIT(31))
> + tango_ir_handle_rc6(ir);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int tango_change_protocol(struct rc_dev *dev, u64 *rc_type)
> +{
> + struct tango_ir *ir = dev->priv;
> + u32 rc5_ctrl = DISABLE_NEC;
> + u32 rc6_ctrl = 0;
> +
> + if (*rc_type & RC_PROTO_BIT_NEC)
> + rc5_ctrl = 0;
> +
> + if (*rc_type & RC_PROTO_BIT_RC5)
> + rc5_ctrl |= ENABLE_RC5;
> +
> + if (*rc_type & RC_PROTO_BIT_RC6_0)
> + rc6_ctrl = ENABLE_RC6;
> +
> + writel_relaxed(rc5_ctrl, ir->rc5_base + IR_CTRL);
> + writel_relaxed(rc6_ctrl, ir->rc6_base + RC6_CTRL);
> +
> + return 0;
> +}
> +
> +static int tango_ir_probe(struct platform_device *pdev)
> +{
> + const char *map_name = RC_MAP_EMPTY;
> + struct device *dev = &pdev->dev;
> + struct rc_dev *rc;
> + struct tango_ir *ir;
> + struct resource *rc5_res;
> + struct resource *rc6_res;
> + u64 clkrate, clkdiv;
> + int irq, err;
> + u32 val;
> +
> + rc5_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!rc5_res)
> + return -EINVAL;
> +
> + rc6_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + if (!rc6_res)
> + return -EINVAL;
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq <= 0)
> + return -EINVAL;
> +
> + ir = devm_kzalloc(dev, sizeof(*ir), GFP_KERNEL);
> + if (!ir)
> + return -ENOMEM;
> +
> + ir->rc5_base = devm_ioremap_resource(dev, rc5_res);
> + if (IS_ERR(ir->rc5_base))
> + return PTR_ERR(ir->rc5_base);
> +
> + ir->rc6_base = devm_ioremap_resource(dev, rc6_res);
> + if (IS_ERR(ir->rc6_base))
> + return PTR_ERR(ir->rc6_base);
> +
> + ir->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(ir->clk))
> + return PTR_ERR(ir->clk);
> +
> + rc = devm_rc_allocate_device(dev, RC_DRIVER_SCANCODE);
> + if (!rc)
> + return -ENOMEM;
> +
> + of_property_read_string(dev->of_node, "linux,rc-map-name", &map_name);
> +
> + rc->device_name = DRIVER_NAME;
> + rc->driver_name = DRIVER_NAME;
> + rc->input_phys = DRIVER_NAME "/input0";
> + rc->map_name = map_name;
> + rc->allowed_protocols = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_0 |
> + RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32;
> + rc->change_protocol = tango_change_protocol;
> + rc->priv = ir;
> + ir->rc = rc;
> +
> + err = clk_prepare_enable(ir->clk);
> + if (err)
> + return err;
> +
> + clkrate = clk_get_rate(ir->clk);
> +
> + clkdiv = clkrate * NEC_TIME_BASE;
> + do_div(clkdiv, 1000000);
> +
> + val = NEC_CAP(31) | GPIO_SEL(12) | clkdiv;
> + writel_relaxed(val, ir->rc5_base + IR_NEC_CTRL);
> +
> + clkdiv = clkrate * RC5_TIME_BASE;
> + do_div(clkdiv, 1000000);
> +
> + writel_relaxed(DISABLE_NEC, ir->rc5_base + IR_CTRL);
> + writel_relaxed(clkdiv, ir->rc5_base + IR_RC5_CLK_DIV);
> + writel_relaxed(ACK_IR_INT, ir->rc5_base + IR_INT);
> +
> + clkdiv = clkrate * RC6_TIME_BASE;
> + do_div(clkdiv, RC6_CARRIER);
> +
> + writel_relaxed(ACK_RC6_INT, ir->rc6_base + RC6_CTRL);
> + writel_relaxed((clkdiv >> 2) << 18 | clkdiv, ir->rc6_base + RC6_CLKDIV);
> +
> + err = devm_request_irq(dev, irq, tango_ir_irq, IRQF_SHARED,
> + dev_name(dev), ir);
> + if (err)
> + goto err_clk;
> +
> + err = devm_rc_register_device(dev, rc);
> + if (err)
> + goto err_clk;
> +
> + platform_set_drvdata(pdev, ir);
> + return 0;
> +
> +err_clk:
> + clk_disable_unprepare(ir->clk);
> + return err;
> +}
> +
> +static int tango_ir_remove(struct platform_device *pdev)
> +{
> + struct tango_ir *ir = platform_get_drvdata(pdev);
> + clk_disable_unprepare(ir->clk);
> + return 0;
> +}
> +
> +static const struct of_device_id tango_ir_dt_ids[] = {
> + { .compatible = "sigma,smp8642-ir" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, tango_ir_dt_ids);
> +
> +static struct platform_driver tango_ir_driver = {
> + .probe = tango_ir_probe,
> + .remove = tango_ir_remove,
> + .driver = {
> + .name = DRIVER_NAME,
> + .of_match_table = tango_ir_dt_ids,
> + },
> +};
> +module_platform_driver(tango_ir_driver);
> +
> +MODULE_DESCRIPTION("SMP86xx IR decoder driver");
> +MODULE_AUTHOR("Mans Rullgard <m...@mansr.com>");
> +MODULE_LICENSE("GPL");
> --
> 2.11.0
--
Måns Rullgård
