diff options
author | Wang Kefeng <wangkefeng.wang@huawei.com> | 2022-04-18 09:07:13 +0300 |
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committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-05-20 14:32:31 +0300 |
commit | 1f44de0f5e309e8699b569b49a8e89ef4e7527c7 (patch) | |
tree | 0f9bb85c67500ab5893410b2444e45803d328f60 /drivers | |
parent | 3cfb3019979666bdf33a1010147363cf05e0f17b (diff) | |
download | linux-1f44de0f5e309e8699b569b49a8e89ef4e7527c7.tar.xz |
ARM: 9193/1: amba: Add amba_read_periphid() helper
Add new amba_read_periphid() helper to simplify error handling.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/amba/bus.c | 133 |
1 files 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; } /* |