Hello!
On 3/14/2017 7:36 PM, Bartlomiej Zolnierkiewicz wrote:
Add Palmchip BK3710 PATA controller driver.
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
[...]
diff --git a/drivers/ata/pata_bk3710.c b/drivers/ata/pata_bk3710.c
new file mode 100644
index 0000000..6d77217
--- /dev/null
+++ b/drivers/ata/pata_bk3710.c
@@ -0,0 +1,386 @@
[...]
+static void pata_bk3710_chipinit(void __iomem *base)
+{
[...]
+ /*
+ * IORDYTMP IORDY Timer for Primary Register
+ * (ATA_IORDYTMP_IORDYTMP , 0xffff )
+ */
+ iowrite32(0xFFFF, base + BK3710_IORDYTMP);
As I've already said, this is useless as we don't handle the IORDY timeout
interrupt anyway; writing 0 would be fine.
+
+ /*
+ * Configure BMISP Register
+ * (ATA_BMISP_DMAEN1 , DISABLE ) |
+ * (ATA_BMISP_DMAEN0 , DISABLE ) |
+ * (ATA_BMISP_IORDYINT , CLEAR) |
+ * (ATA_BMISP_INTRSTAT , CLEAR) |
+ * (ATA_BMISP_DMAERROR , CLEAR)
+ */
+ iowrite16(0, base + BK3710_BMISP);
Bits 0-3 cane only be cleared by writing 1, so this write can't clear
them, contrary to what the comment says. Might be a material for a follow-up
patch tho...
[...]
+static int __init pata_bk3710_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+ struct resource *mem;
+ struct ata_host *host;
+ struct ata_port *ap;
+ void __iomem *base;
+ unsigned long rate;
+ int irq;
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return -ENODEV;
+
+ clk_enable(clk);
+ rate = clk_get_rate(clk);
+ if (!rate)
+ return -EINVAL;
+
+ /* NOTE: round *down* to meet minimum timings; we count in clocks */
+ ideclk_period = 1000000000UL / rate;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (mem == NULL) {
+ pr_err(DRV_NAME ": failed to get memory region resource\n");
+ return -ENODEV;
+ }
NULL check not needed here, devm_ioremap_resource() checks this anyway.
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ pr_err(DRV_NAME ": failed to get IRQ resource\n");
+ return irq;
+ }
+
+ base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
[...]
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:palm_bk3710");
+
+static struct platform_driver pata_bk3710_driver = {
+ .driver = {
+ .name = "palm_bk3710",
Not DRV_NAME?
[...]
MBR, Sergei
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