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[media] rc: sunxi-cir: Add support for the larger fifo found on sun5i and sun6i 

Add support for the larger fifo found on sun5i and sun6i, having a separate
compatible for the ir found on sun5i & sun6i also is useful if we ever want
to add ir transmit support, because the sun5i & sun6i version do not have
transmit support.

Note this commits also adds checking for the end-of-packet interrupt flag
(which was already enabled), as the fifo-data-available interrupt flag only
gets set when the trigger-level is exceeded. So far we've been getting away
with not doing this because of the low trigger-level, but this is something
which we should have done since day one.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans de Goede 2014-11-20 12:10:47 -03:00 committed by Mauro Carvalho Chehab
parent 44f8af6846
commit a4bca4c7ad
2 changed files with 13 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/media/sunxi-ir.txt
View File

@ -1,7 +1,7 @@
Device-Tree bindings for SUNXI IR controller found in sunXi SoC family
Required properties:
- compatible : should be "allwinner,sun4i-a10-ir";
- compatible : "allwinner,sun4i-a10-ir" or "allwinner,sun5i-a13-ir"
- clocks : list of clock specifiers, corresponding to
entries in clock-names property;
- clock-names : should contain "apb" and "ir" entries;

21
drivers/media/rc/sunxi-cir.c
View File

@ -56,12 +56,12 @@
#define REG_RXINT_RAI_EN BIT(4)
/* Rx FIFO available byte level */
#define REG_RXINT_RAL(val) (((val) << 8) & (GENMASK(11, 8)))
#define REG_RXINT_RAL(val) ((val) << 8)
/* Rx Interrupt Status */
#define SUNXI_IR_RXSTA_REG 0x30
/* RX FIFO Get Available Counter */
#define REG_RXSTA_GET_AC(val) (((val) >> 8) & (GENMASK(5, 0)))
#define REG_RXSTA_GET_AC(val) (((val) >> 8) & (ir->fifo_size * 2 - 1))
/* Clear all interrupt status value */
#define REG_RXSTA_CLEARALL 0xff
@ -72,10 +72,6 @@
/* CIR_REG register idle threshold */
#define REG_CIR_ITHR(val) (((val) << 8) & (GENMASK(15, 8)))
/* Hardware supported fifo size */
#define SUNXI_IR_FIFO_SIZE 16
/* How many messages in FIFO trigger IRQ */
#define TRIGGER_LEVEL 8
/* Required frequency for IR0 or IR1 clock in CIR mode */
#define SUNXI_IR_BASE_CLK 8000000
/* Frequency after IR internal divider */
@ -94,6 +90,7 @@ struct sunxi_ir {
struct rc_dev *rc;
void __iomem *base;
int irq;
int fifo_size;
struct clk *clk;
struct clk *apb_clk;
struct reset_control *rst;
@ -115,11 +112,11 @@ static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id)
/* clean all pending statuses */
writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
if (status & REG_RXINT_RAI_EN) {
if (status & (REG_RXINT_RAI_EN | REG_RXINT_RPEI_EN)) {
/* How many messages in fifo */
rc = REG_RXSTA_GET_AC(status);
/* Sanity check */
rc = rc > SUNXI_IR_FIFO_SIZE ? SUNXI_IR_FIFO_SIZE : rc;
rc = rc > ir->fifo_size ? ir->fifo_size : rc;
/* If we have data */
for (cnt = 0; cnt < rc; cnt++) {
/* for each bit in fifo */
@ -156,6 +153,11 @@ static int sunxi_ir_probe(struct platform_device *pdev)
if (!ir)
return -ENOMEM;
if (of_device_is_compatible(dn, "allwinner,sun5i-a13-ir"))
ir->fifo_size = 64;
else
ir->fifo_size = 16;
/* Clock */
ir->apb_clk = devm_clk_get(dev, "apb");
if (IS_ERR(ir->apb_clk)) {
@ -271,7 +273,7 @@ static int sunxi_ir_probe(struct platform_device *pdev)
* level
*/
writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN |
REG_RXINT_RAI_EN | REG_RXINT_RAL(TRIGGER_LEVEL - 1),
REG_RXINT_RAI_EN | REG_RXINT_RAL(ir->fifo_size / 2 - 1),
ir->base + SUNXI_IR_RXINT_REG);
/* Enable IR Module */
@ -319,6 +321,7 @@ static int sunxi_ir_remove(struct platform_device *pdev)
static const struct of_device_id sunxi_ir_match[] = {
{ .compatible = "allwinner,sun4i-a10-ir", },
{ .compatible = "allwinner,sun5i-a13-ir", },
{},
};