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Diffstat (limited to 'arch/powerpc/kernel/legacy_serial.c')
-rw-r--r--arch/powerpc/kernel/legacy_serial.c88
1 files changed, 46 insertions, 42 deletions
diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index f048c424c525..ae1906bfe8a5 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -5,8 +5,8 @@
#include <linux/serial_core.h>
#include <linux/console.h>
#include <linux/pci.h>
+#include <linux/of.h>
#include <linux/of_address.h>
-#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/serial_reg.h>
#include <asm/io.h>
@@ -54,9 +54,10 @@ static int legacy_serial_console = -1;
static const upf_t legacy_port_flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
UPF_SHARE_IRQ | UPF_FIXED_PORT;
-static unsigned int tsi_serial_in(struct uart_port *p, int offset)
+static u32 tsi_serial_in(struct uart_port *p, unsigned int offset)
{
- unsigned int tmp;
+ u32 tmp;
+
offset = offset << p->regshift;
if (offset == UART_IIR) {
tmp = readl(p->membase + (UART_IIR & ~3));
@@ -65,7 +66,7 @@ static unsigned int tsi_serial_in(struct uart_port *p, int offset)
return readb(p->membase + offset);
}
-static void tsi_serial_out(struct uart_port *p, int offset, int value)
+static void tsi_serial_out(struct uart_port *p, unsigned int offset, u32 value)
{
offset = offset << p->regshift;
if (!((offset == UART_IER) && (value & UART_IER_UUE)))
@@ -77,6 +78,8 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
phys_addr_t taddr, unsigned long irq,
upf_t flags, int irq_check_parent)
{
+ struct plat_serial8250_port *legacy_port;
+ struct legacy_serial_info *legacy_info;
const __be32 *clk, *spd, *rs;
u32 clock = BASE_BAUD * 16;
u32 shift = 0;
@@ -110,16 +113,17 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
if (index >= legacy_serial_count)
legacy_serial_count = index + 1;
+ legacy_port = &legacy_serial_ports[index];
+ legacy_info = &legacy_serial_infos[index];
+
/* Check if there is a port who already claimed our slot */
- if (legacy_serial_infos[index].np != NULL) {
+ if (legacy_info->np != NULL) {
/* if we still have some room, move it, else override */
if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
index, legacy_serial_count);
- legacy_serial_ports[legacy_serial_count] =
- legacy_serial_ports[index];
- legacy_serial_infos[legacy_serial_count] =
- legacy_serial_infos[index];
+ legacy_serial_ports[legacy_serial_count] = *legacy_port;
+ legacy_serial_infos[legacy_serial_count] = *legacy_info;
legacy_serial_count++;
} else {
printk(KERN_DEBUG "Replacing legacy port %d\n", index);
@@ -127,36 +131,32 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
}
/* Now fill the entry */
- memset(&legacy_serial_ports[index], 0,
- sizeof(struct plat_serial8250_port));
+ memset(legacy_port, 0, sizeof(*legacy_port));
if (iotype == UPIO_PORT)
- legacy_serial_ports[index].iobase = base;
+ legacy_port->iobase = base;
else
- legacy_serial_ports[index].mapbase = base;
-
- legacy_serial_ports[index].iotype = iotype;
- legacy_serial_ports[index].uartclk = clock;
- legacy_serial_ports[index].irq = irq;
- legacy_serial_ports[index].flags = flags;
- legacy_serial_ports[index].regshift = shift;
- legacy_serial_infos[index].taddr = taddr;
- legacy_serial_infos[index].np = of_node_get(np);
- legacy_serial_infos[index].clock = clock;
- legacy_serial_infos[index].speed = spd ? be32_to_cpup(spd) : 0;
- legacy_serial_infos[index].irq_check_parent = irq_check_parent;
+ legacy_port->mapbase = base;
+
+ legacy_port->iotype = iotype;
+ legacy_port->uartclk = clock;
+ legacy_port->irq = irq;
+ legacy_port->flags = flags;
+ legacy_port->regshift = shift;
+ legacy_info->taddr = taddr;
+ legacy_info->np = of_node_get(np);
+ legacy_info->clock = clock;
+ legacy_info->speed = spd ? be32_to_cpup(spd) : 0;
+ legacy_info->irq_check_parent = irq_check_parent;
if (iotype == UPIO_TSI) {
- legacy_serial_ports[index].serial_in = tsi_serial_in;
- legacy_serial_ports[index].serial_out = tsi_serial_out;
+ legacy_port->serial_in = tsi_serial_in;
+ legacy_port->serial_out = tsi_serial_out;
}
- printk(KERN_DEBUG "Found legacy serial port %d for %pOF\n",
- index, np);
- printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
+ printk(KERN_DEBUG "Found legacy serial port %d for %pOF\n", index, np);
+ printk(KERN_DEBUG " %s=%pa, taddr=%pa, irq=%lx, clk=%d, speed=%d\n",
(iotype == UPIO_PORT) ? "port" : "mem",
- (unsigned long long)base, (unsigned long long)taddr, irq,
- legacy_serial_ports[index].uartclk,
- legacy_serial_infos[index].speed);
+ &base, &taddr, irq, legacy_port->uartclk, legacy_info->speed);
return index;
}
@@ -171,15 +171,15 @@ static int __init add_legacy_soc_port(struct device_node *np,
/* We only support ports that have a clock frequency properly
* encoded in the device-tree.
*/
- if (of_get_property(np, "clock-frequency", NULL) == NULL)
+ if (!of_property_present(np, "clock-frequency"))
return -1;
/* if reg-offset don't try to use it */
- if ((of_get_property(np, "reg-offset", NULL) != NULL))
+ if (of_property_present(np, "reg-offset"))
return -1;
/* if rtas uses this device, don't try to use it as well */
- if (of_get_property(np, "used-by-rtas", NULL) != NULL)
+ if (of_property_read_bool(np, "used-by-rtas"))
return -1;
/* Get the address */
@@ -237,7 +237,7 @@ static int __init add_legacy_isa_port(struct device_node *np,
* Note: Don't even try on P8 lpc, we know it's not directly mapped
*/
if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") ||
- of_get_property(isa_brg, "ranges", NULL)) {
+ of_property_present(isa_brg, "ranges")) {
taddr = of_translate_address(np, reg);
if (taddr == OF_BAD_ADDR)
taddr = 0;
@@ -268,7 +268,7 @@ static int __init add_legacy_pci_port(struct device_node *np,
* compatible UARTs on PCI need all sort of quirks (port offsets
* etc...) that this code doesn't know about
*/
- if (of_get_property(np, "clock-frequency", NULL) == NULL)
+ if (!of_property_present(np, "clock-frequency"))
return -1;
/* Get the PCI address. Assume BAR 0 */
@@ -508,12 +508,16 @@ static void __init fixup_port_irq(int index,
port->irq = virq;
-#ifdef CONFIG_SERIAL_8250_FSL
- if (of_device_is_compatible(np, "fsl,ns16550")) {
- port->handle_irq = fsl8250_handle_irq;
- port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
+ if (IS_ENABLED(CONFIG_SERIAL_8250) &&
+ of_device_is_compatible(np, "fsl,ns16550")) {
+ if (IS_REACHABLE(CONFIG_SERIAL_8250_FSL)) {
+ port->handle_irq = fsl8250_handle_irq;
+ port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
+ } else {
+ pr_warn_once("Not activating Freescale specific workaround for device %pOFP\n",
+ np);
+ }
}
-#endif
}
static void __init fixup_port_pio(int index,
generated by cgit (git 2.34.1) at 2025-12-24 20:12:52 +0000