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serial: ns16550: Fix ordering of getting base address

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Currently the driver gets ns16550 base address in the driver
probe() routine, which may potentially break any ns16550 wrapper
driver that does additional initialization before calling
ns16550_serial_probe().

Things are complicated that we need consider ns16550 devices on
both simple-bus and PCI bus. To fix the issue we move the base
address assignment for simple-bus ns16550 device back to the
ofdata_to_platdata(), and assign base address for PCI ns16550
device in ns16550_serial_probe().

This is still not perfect. If any PCI bus based ns16550 wrapper
driver tries to access plat->base before calling probe(), it is
still subject to break.

Fixes: 720f9e1fdb ("serial: ns16550: Move PCI access from ofdata_to_platdata() to probe()")
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Tested-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
This commit is contained in:
Bin Meng 2020-04-03 18:35:32 -07:00
parent 4d073fa83b
commit 9e6ce62190
1 changed files with 22 additions and 17 deletions
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39
drivers/serial/ns16550.c
View file

@ -479,39 +479,38 @@ static int ns16550_serial_getinfo(struct udevice *dev,
return 0;
}
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
static int ns1655_serial_set_base_addr(struct udevice *dev)
static int ns16550_serial_assign_base(struct ns16550_platdata *plat, ulong base)
{
fdt_addr_t addr;
struct ns16550_platdata *plat;
plat = dev_get_platdata(dev);
addr = dev_read_addr_pci(dev);
if (addr == FDT_ADDR_T_NONE)
if (base == FDT_ADDR_T_NONE)
return -EINVAL;
#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
plat->base = addr;
plat->base = base;
#else
plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
plat->base = (unsigned long)map_physmem(base, 0, MAP_NOCACHE);
#endif
return 0;
}
#endif
int ns16550_serial_probe(struct udevice *dev)
{
struct ns16550_platdata *plat = dev->platdata;
struct NS16550 *const com_port = dev_get_priv(dev);
struct reset_ctl_bulk reset_bulk;
fdt_addr_t addr;
int ret;
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
ret = ns1655_serial_set_base_addr(dev);
if (ret)
return ret;
#endif
/*
* If we are on PCI bus, either directly attached to a PCI root port,
* or via a PCI bridge, assign platdata->base before probing hardware.
*/
if (device_is_on_pci_bus(dev)) {
addr = devfdt_get_addr_pci(dev);
ret = ns16550_serial_assign_base(plat, addr);
if (ret)
return ret;
}
ret = reset_get_bulk(dev, &reset_bulk);
if (!ret)
@ -535,9 +534,15 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
{
struct ns16550_platdata *plat = dev->platdata;
const u32 port_type = dev_get_driver_data(dev);
fdt_addr_t addr;
struct clk clk;
int err;
addr = dev_read_addr(dev);
err = ns16550_serial_assign_base(plat, addr);
if (err && !device_is_on_pci_bus(dev))
return err;
plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
plat->reg_shift = dev_read_u32_default(dev, "reg-shift", 0);
plat->reg_width = dev_read_u32_default(dev, "reg-io-width", 1);