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Diffstat (limited to 'arch/powerpc/kernel/legacy_serial.c')
-rw-r--r--arch/powerpc/kernel/legacy_serial.c134
1 files changed, 99 insertions, 35 deletions
diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index c834757bebc..936258881c9 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -6,6 +6,7 @@
#include <linux/pci.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
+#include <linux/serial_reg.h>
#include <asm/io.h>
#include <asm/mmu.h>
#include <asm/prom.h>
@@ -34,7 +35,7 @@ static struct legacy_serial_info {
phys_addr_t taddr;
} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
-static struct __initdata of_device_id legacy_serial_parents[] = {
+static struct of_device_id legacy_serial_parents[] __initdata = {
{.type = "soc",},
{.type = "tsi-bridge",},
{.type = "opb", },
@@ -47,13 +48,35 @@ static struct __initdata of_device_id legacy_serial_parents[] = {
static unsigned int legacy_serial_count;
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)
+{
+ unsigned int tmp;
+ offset = offset << p->regshift;
+ if (offset == UART_IIR) {
+ tmp = readl(p->membase + (UART_IIR & ~3));
+ return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */
+ } else
+ return readb(p->membase + offset);
+}
+
+static void tsi_serial_out(struct uart_port *p, int offset, int value)
+{
+ offset = offset << p->regshift;
+ if (!((offset == UART_IER) && (value & UART_IER_UUE)))
+ writeb(value, p->membase + offset);
+}
+
static int __init add_legacy_port(struct device_node *np, int want_index,
int iotype, phys_addr_t base,
phys_addr_t taddr, unsigned long irq,
upf_t flags, int irq_check_parent)
{
- const __be32 *clk, *spd;
+ const __be32 *clk, *spd, *rs;
u32 clock = BASE_BAUD * 16;
+ u32 shift = 0;
int index;
/* get clock freq. if present */
@@ -64,6 +87,11 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
/* get default speed if present */
spd = of_get_property(np, "current-speed", NULL);
+ /* get register shift if present */
+ rs = of_get_property(np, "reg-shift", NULL);
+ if (rs && *rs)
+ shift = be32_to_cpup(rs);
+
/* If we have a location index, then try to use it */
if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
index = want_index;
@@ -80,7 +108,7 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
legacy_serial_count = index + 1;
/* Check if there is a port who already claimed our slot */
- if (legacy_serial_infos[index].np != 0) {
+ if (legacy_serial_infos[index].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",
@@ -102,16 +130,23 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
legacy_serial_ports[index].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;
+ if (iotype == UPIO_TSI) {
+ legacy_serial_ports[index].serial_in = tsi_serial_in;
+ legacy_serial_ports[index].serial_out = tsi_serial_out;
+ }
+
printk(KERN_DEBUG "Found legacy serial port %d for %s\n",
index, np->full_name);
printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
@@ -127,9 +162,7 @@ static int __init add_legacy_soc_port(struct device_node *np,
struct device_node *soc_dev)
{
u64 addr;
- const u32 *addrp;
- upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ
- | UPF_FIXED_PORT;
+ const __be32 *addrp;
struct device_node *tsi = of_get_parent(np);
/* We only support ports that have a clock frequency properly
@@ -138,9 +171,8 @@ static int __init add_legacy_soc_port(struct device_node *np,
if (of_get_property(np, "clock-frequency", NULL) == NULL)
return -1;
- /* if reg-shift or offset, don't try to use it */
- if ((of_get_property(np, "reg-shift", NULL) != NULL) ||
- (of_get_property(np, "reg-offset", NULL) != NULL))
+ /* if reg-offset don't try to use it */
+ if ((of_get_property(np, "reg-offset", NULL) != NULL))
return -1;
/* if rtas uses this device, don't try to use it as well */
@@ -160,9 +192,11 @@ static int __init add_legacy_soc_port(struct device_node *np,
* IO port value. It will be fixed up later along with the irq
*/
if (tsi && !strcmp(tsi->type, "tsi-bridge"))
- return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0);
+ return add_legacy_port(np, -1, UPIO_TSI, addr, addr,
+ NO_IRQ, legacy_port_flags, 0);
else
- return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0);
+ return add_legacy_port(np, -1, UPIO_MEM, addr, addr,
+ NO_IRQ, legacy_port_flags, 0);
}
static int __init add_legacy_isa_port(struct device_node *np,
@@ -196,14 +230,19 @@ static int __init add_legacy_isa_port(struct device_node *np,
/* Translate ISA address. If it fails, we still register the port
* with no translated address so that it can be picked up as an IO
* port later by the serial driver
+ *
+ * Note: Don't even try on P8 lpc, we know it's not directly mapped
*/
- taddr = of_translate_address(np, reg);
- if (taddr == OF_BAD_ADDR)
+ if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc")) {
+ taddr = of_translate_address(np, reg);
+ if (taddr == OF_BAD_ADDR)
+ taddr = 0;
+ } else
taddr = 0;
/* Add port, irq will be dealt with later */
- return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]), taddr,
- NO_IRQ, UPF_BOOT_AUTOCONF, 0);
+ return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]),
+ taddr, NO_IRQ, legacy_port_flags, 0);
}
@@ -212,7 +251,7 @@ static int __init add_legacy_pci_port(struct device_node *np,
struct device_node *pci_dev)
{
u64 addr, base;
- const u32 *addrp;
+ const __be32 *addrp;
unsigned int flags;
int iotype, index = -1, lindex = 0;
@@ -245,7 +284,7 @@ static int __init add_legacy_pci_port(struct device_node *np,
if (iotype == UPIO_MEM)
base = addr;
else
- base = addrp[2];
+ base = of_read_number(&addrp[2], 1);
/* Try to guess an index... If we have subdevices of the pci dev,
* we get to their "reg" property
@@ -276,25 +315,40 @@ static int __init add_legacy_pci_port(struct device_node *np,
* IO port value. It will be fixed up later along with the irq
*/
return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
- UPF_BOOT_AUTOCONF, np != pci_dev);
+ legacy_port_flags, np != pci_dev);
}
#endif
static void __init setup_legacy_serial_console(int console)
{
- struct legacy_serial_info *info =
- &legacy_serial_infos[console];
+ struct legacy_serial_info *info = &legacy_serial_infos[console];
+ struct plat_serial8250_port *port = &legacy_serial_ports[console];
void __iomem *addr;
+ unsigned int stride;
- if (info->taddr == 0)
- return;
- addr = ioremap(info->taddr, 0x1000);
- if (addr == NULL)
- return;
+ stride = 1 << port->regshift;
+
+ /* Check if a translated MMIO address has been found */
+ if (info->taddr) {
+ addr = ioremap(info->taddr, 0x1000);
+ if (addr == NULL)
+ return;
+ udbg_uart_init_mmio(addr, stride);
+ } else {
+ /* Check if it's PIO and we support untranslated PIO */
+ if (port->iotype == UPIO_PORT && isa_io_special)
+ udbg_uart_init_pio(port->iobase, stride);
+ else
+ return;
+ }
+
+ /* Try to query the current speed */
if (info->speed == 0)
- info->speed = udbg_probe_uart_speed(addr, info->clock);
+ info->speed = udbg_probe_uart_speed(info->clock);
+
+ /* Set it up */
DBG("default console speed = %d\n", info->speed);
- udbg_init_uart(addr, info->speed, info->clock);
+ udbg_uart_setup(info->speed, info->clock);
}
/*
@@ -330,9 +384,11 @@ void __init find_legacy_serial_ports(void)
if (!parent)
continue;
if (of_match_node(legacy_serial_parents, parent) != NULL) {
- index = add_legacy_soc_port(np, np);
- if (index >= 0 && np == stdout)
- legacy_serial_console = index;
+ if (of_device_is_available(np)) {
+ index = add_legacy_soc_port(np, np);
+ if (index >= 0 && np == stdout)
+ legacy_serial_console = index;
+ }
}
of_node_put(parent);
}
@@ -340,10 +396,13 @@ void __init find_legacy_serial_ports(void)
/* Next, fill our array with ISA ports */
for_each_node_by_type(np, "serial") {
struct device_node *isa = of_get_parent(np);
- if (isa && !strcmp(isa->name, "isa")) {
- index = add_legacy_isa_port(np, isa);
- if (index >= 0 && np == stdout)
- legacy_serial_console = index;
+ if (isa && (!strcmp(isa->name, "isa") ||
+ !strcmp(isa->name, "lpc"))) {
+ if (of_device_is_available(np)) {
+ index = add_legacy_isa_port(np, isa);
+ if (index >= 0 && np == stdout)
+ legacy_serial_console = index;
+ }
}
of_node_put(isa);
}
@@ -360,7 +419,7 @@ void __init find_legacy_serial_ports(void)
of_node_put(parent);
continue;
}
- /* Check for known pciclass, and also check wether we have
+ /* Check for known pciclass, and also check whether we have
* a device with child nodes for ports or not
*/
if (of_device_is_compatible(np, "pciclass,0700") ||
@@ -414,6 +473,11 @@ static void __init fixup_port_irq(int index,
return;
port->irq = virq;
+
+#ifdef CONFIG_SERIAL_8250_FSL
+ if (of_device_is_compatible(np, "fsl,ns16550"))
+ port->handle_irq = fsl8250_handle_irq;
+#endif
}
static void __init fixup_port_pio(int index,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-03 18:26:49 +0000