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Date: Thu, 7 Apr 2022 23:02:39 +0800
From: Kefeng Wang <wangkefeng.wang@...wei.com>
To: Russell King <linux@...linux.org.uk>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
CC: Rob Herring <robh@...nel.org>,
Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 1/2] amba: Add amba_read_periphid() helper
Add new amba_read_periphid() helper to simplify error handling.
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
drivers/amba/bus.c | 133 +++++++++++++++++++++------------------------
1 file changed, 62 insertions(+), 71 deletions(-)
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index d3bd14aaabf6..0073d8ba0353 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -395,107 +395,98 @@ static void amba_device_release(struct device *dev)
kfree(d);
}
-static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
+static int amba_read_periphid(struct amba_device *dev)
{
- u32 size;
+ struct reset_control *rstc;
+ u32 size, pid, cid;
void __iomem *tmp;
int i, ret;
- ret = request_resource(parent, &dev->res);
+ ret = dev_pm_domain_attach(&dev->dev, true);
if (ret)
goto err_out;
- /* Hard-coded primecell ID instead of plug-n-play */
- if (dev->periphid != 0)
- goto skip_probe;
+ ret = amba_get_enable_pclk(dev);
+ if (ret)
+ goto err_pm;
/*
- * Dynamically calculate the size of the resource
- * and use this for iomap
+ * Find reset control(s) of the amba bus and de-assert them.
*/
+ rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node);
+ if (IS_ERR(rstc)) {
+ ret = PTR_ERR(rstc);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&dev->dev, "can't get reset: %d\n", ret);
+ goto err_clk;
+ }
+ reset_control_deassert(rstc);
+ reset_control_put(rstc);
+
size = resource_size(&dev->res);
tmp = ioremap(dev->res.start, size);
if (!tmp) {
ret = -ENOMEM;
- goto err_release;
+ goto err_clk;
}
- ret = dev_pm_domain_attach(&dev->dev, true);
- if (ret) {
- iounmap(tmp);
- goto err_release;
- }
-
- ret = amba_get_enable_pclk(dev);
- if (ret == 0) {
- u32 pid, cid;
- struct reset_control *rstc;
-
- /*
- * Find reset control(s) of the amba bus and de-assert them.
- */
- rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node);
- if (IS_ERR(rstc)) {
- ret = PTR_ERR(rstc);
- if (ret != -EPROBE_DEFER)
- dev_err(&dev->dev, "can't get reset: %d\n",
- ret);
- goto err_reset;
- }
- reset_control_deassert(rstc);
- reset_control_put(rstc);
-
- /*
- * Read pid and cid based on size of resource
- * they are located at end of region
- */
- for (pid = 0, i = 0; i < 4; i++)
- pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
- (i * 8);
- for (cid = 0, i = 0; i < 4; i++)
- cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
- (i * 8);
-
- if (cid == CORESIGHT_CID) {
- /* set the base to the start of the last 4k block */
- void __iomem *csbase = tmp + size - 4096;
-
- dev->uci.devarch =
- readl(csbase + UCI_REG_DEVARCH_OFFSET);
- dev->uci.devtype =
- readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff;
- }
+ /*
+ * Read pid and cid based on size of resource
+ * they are located at end of region
+ */
+ for (pid = 0, i = 0; i < 4; i++)
+ pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << (i * 8);
+ for (cid = 0, i = 0; i < 4; i++)
+ cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << (i * 8);
- amba_put_disable_pclk(dev);
+ if (cid == CORESIGHT_CID) {
+ /* set the base to the start of the last 4k block */
+ void __iomem *csbase = tmp + size - 4096;
- if (cid == AMBA_CID || cid == CORESIGHT_CID) {
- dev->periphid = pid;
- dev->cid = cid;
- }
+ dev->uci.devarch = readl(csbase + UCI_REG_DEVARCH_OFFSET);
+ dev->uci.devtype = readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff;
+ }
- if (!dev->periphid)
- ret = -ENODEV;
+ if (cid == AMBA_CID || cid == CORESIGHT_CID) {
+ dev->periphid = pid;
+ dev->cid = cid;
}
+ if (!dev->periphid)
+ ret = -ENODEV;
+
iounmap(tmp);
+
+err_clk:
+ amba_put_disable_pclk(dev);
+err_pm:
dev_pm_domain_detach(&dev->dev, true);
+err_out:
+ return ret;
+}
+static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
+{
+ int ret;
+
+ ret = request_resource(parent, &dev->res);
if (ret)
- goto err_release;
+ goto err_out;
+
+ /* Hard-coded primecell ID instead of plug-n-play */
+ if (dev->periphid != 0)
+ goto skip_probe;
- skip_probe:
+ ret = amba_read_periphid(dev);
+ if (ret)
+ goto err_release;
+skip_probe:
ret = device_add(&dev->dev);
- err_release:
+err_release:
if (ret)
release_resource(&dev->res);
- err_out:
+err_out:
return ret;
-
- err_reset:
- amba_put_disable_pclk(dev);
- iounmap(tmp);
- dev_pm_domain_detach(&dev->dev, true);
- goto err_release;
}
/*
--
2.26.2
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