[PATCH v8 4/5] tty: serial: handle HAS_IOPORT dependencies

From: Niklas Schnelle
Date: Tue Oct 08 2024 - 08:42:28 EST

In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
compile time. We thus need to add HAS_IOPORT as dependency for those
drivers using them unconditionally. Some 8250 serial drivers support
MMIO only use, so fence only the parts requiring I/O ports and print an
error message if a device can't be supported with the current
configuration.

Co-developed-by: Arnd Bergmann <arnd@xxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxxxx>
Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
---
drivers/tty/Kconfig | 4 ++--
drivers/tty/serial/8250/8250_early.c | 4 ++++
drivers/tty/serial/8250/8250_pci.c | 40 +++++++++++++++++++++++++++++++++++
drivers/tty/serial/8250/8250_pcilib.c | 12 ++++++++++-
drivers/tty/serial/8250/8250_pcilib.h | 2 ++
drivers/tty/serial/8250/8250_port.c | 27 +++++++++++++++++++----
drivers/tty/serial/8250/Kconfig | 4 ++--
drivers/tty/serial/Kconfig | 2 +-
include/linux/serial_core.h | 4 ++++
9 files changed, 89 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index a45d423ad10f02c3a818021bbb18655a8b690500..63a494d36a1fdceba5a7b39f4516060e48af0cc6 100644
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -220,7 +220,7 @@ config MOXA_INTELLIO

config MOXA_SMARTIO
tristate "Moxa SmartIO support v. 2.0"
- depends on SERIAL_NONSTANDARD && PCI
+ depends on SERIAL_NONSTANDARD && PCI && HAS_IOPORT
help
Say Y here if you have a Moxa SmartIO multiport serial card and/or
want to help develop a new version of this driver.
@@ -302,7 +302,7 @@ config GOLDFISH_TTY_EARLY_CONSOLE

config IPWIRELESS
tristate "IPWireless 3G UMTS PCMCIA card support"
- depends on PCMCIA && NETDEVICES
+ depends on PCMCIA && NETDEVICES && HAS_IOPORT
select PPP
help
This is a driver for 3G UMTS PCMCIA card from IPWireless company. In
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 6176083d0341ca10edebe5c4eebfffc922a61472..84242292176570cd2c92afbd4755d303827a4abc 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -46,8 +46,10 @@ static unsigned int serial8250_early_in(struct uart_port *port, int offset)
return readl(port->membase + offset);
case UPIO_MEM32BE:
return ioread32be(port->membase + offset);
+#ifdef CONFIG_HAS_IOPORT
case UPIO_PORT:
return inb(port->iobase + offset);
+#endif
default:
return 0;
}
@@ -70,9 +72,11 @@ static void serial8250_early_out(struct uart_port *port, int offset, int value)
case UPIO_MEM32BE:
iowrite32be(value, port->membase + offset);
break;
+#ifdef CONFIG_HAS_IOPORT
case UPIO_PORT:
outb(value, port->iobase + offset);
break;
+#endif
}
}

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 6709b6a5f3011db38acc58dc7223158fe4fcf72e..7d7a6d62c09ceabcf4094d539c565ed09c153561 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -964,6 +964,9 @@ static int pci_ite887x_init(struct pci_dev *dev)
struct resource *iobase = NULL;
u32 miscr, uartbar, ioport;

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(dev);
+
/* search for the base-ioport */
for (i = 0; i < ARRAY_SIZE(inta_addr); i++) {
iobase = request_region(inta_addr[i], ITE_887x_IOSIZE,
@@ -1514,6 +1517,9 @@ static int pci_quatech_init(struct pci_dev *dev)
const struct pci_device_id *match;
bool amcc = false;

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(dev);
+
match = pci_match_id(quatech_cards, dev);
if (match)
amcc = match->driver_data;
@@ -1538,6 +1544,9 @@ static int pci_quatech_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(priv->dev);
+
/* Needed by pci_quatech calls below */
port->port.iobase = pci_resource_start(priv->dev, FL_GET_BASE(board->flags));
/* Set up the clocking */
@@ -1655,6 +1664,9 @@ static int pci_fintek_setup(struct serial_private *priv,
u8 config_base;
u16 iobase;

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(pdev);
+
config_base = 0x40 + 0x08 * idx;

/* Get the io address from configuration space */
@@ -1686,6 +1698,9 @@ static int pci_fintek_init(struct pci_dev *dev)
u8 config_base;
struct serial_private *priv = pci_get_drvdata(dev);

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(dev);
+
if (!(pci_resource_flags(dev, 5) & IORESOURCE_IO) ||
!(pci_resource_flags(dev, 4) & IORESOURCE_IO) ||
!(pci_resource_flags(dev, 3) & IORESOURCE_IO))
@@ -1864,6 +1879,9 @@ static int kt_serial_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(priv->dev);
+
port->port.flags |= UPF_BUG_THRE;
port->port.serial_in = kt_serial_in;
port->port.handle_break = kt_handle_break;
@@ -1884,6 +1902,9 @@ pci_wch_ch353_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(priv->dev);
+
port->port.flags |= UPF_FIXED_TYPE;
port->port.type = PORT_16550A;
return pci_default_setup(priv, board, port, idx);
@@ -1894,6 +1915,9 @@ pci_wch_ch355_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(priv->dev);
+
port->port.flags |= UPF_FIXED_TYPE;
port->port.type = PORT_16550A;
return pci_default_setup(priv, board, port, idx);
@@ -1904,6 +1928,9 @@ pci_wch_ch38x_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(priv->dev);
+
port->port.flags |= UPF_FIXED_TYPE;
port->port.type = PORT_16850;
return pci_default_setup(priv, board, port, idx);
@@ -1918,6 +1945,8 @@ static int pci_wch_ch38x_init(struct pci_dev *dev)
int max_port;
unsigned long iobase;

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(dev);

switch (dev->device) {
case 0x3853: /* 8 ports */
@@ -1937,6 +1966,11 @@ static void pci_wch_ch38x_exit(struct pci_dev *dev)
{
unsigned long iobase;

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT)) {
+ serial_8250_warn_need_ioport(dev);
+ return;
+ }
+
iobase = pci_resource_start(dev, 0);
outb(0x0, iobase + CH384_XINT_ENABLE_REG);
}
@@ -2052,6 +2086,9 @@ static int pci_moxa_init(struct pci_dev *dev)
unsigned int i, num_ports = moxa_get_nports(device);
u8 val, init_mode = MOXA_RS232;

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(dev);
+
if (!(pci_moxa_supported_rs(dev) & MOXA_SUPP_RS232)) {
init_mode = MOXA_RS422;
}
@@ -2084,6 +2121,9 @@ pci_moxa_setup(struct serial_private *priv,
unsigned int bar = FL_GET_BASE(board->flags);
int offset;

+ if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+ return serial_8250_warn_need_ioport(priv->dev);
+
if (board->num_ports == 4 && idx == 3)
offset = 7 * board->uart_offset;
else
diff --git a/drivers/tty/serial/8250/8250_pcilib.c b/drivers/tty/serial/8250/8250_pcilib.c
index ea906d721b2c3eac15c9e8d62cc6fa56c3ef6150..ec4d041778027a0c9f27facbb97c2b74819cfda3 100644
--- a/drivers/tty/serial/8250/8250_pcilib.c
+++ b/drivers/tty/serial/8250/8250_pcilib.c
@@ -12,6 +12,14 @@
#include "8250.h"
#include "8250_pcilib.h"

+int serial_8250_warn_need_ioport(struct pci_dev *dev)
+{
+ dev_warn(&dev->dev,
+ "Serial port not supported because of missing I/O resource\n");
+
+ return -ENXIO;
+}
+
int serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port,
u8 bar, unsigned int offset, int regshift)
{
@@ -27,12 +35,14 @@ int serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port,
port->port.mapbase = pci_resource_start(dev, bar) + offset;
port->port.membase = pcim_iomap_table(dev)[bar] + offset;
port->port.regshift = regshift;
- } else {
+ } else if (IS_ENABLED(CONFIG_HAS_IOPORT)) {
port->port.iotype = UPIO_PORT;
port->port.iobase = pci_resource_start(dev, bar) + offset;
port->port.mapbase = 0;
port->port.membase = NULL;
port->port.regshift = 0;
+ } else {
+ return serial_8250_warn_need_ioport(dev);
}
return 0;
}
diff --git a/drivers/tty/serial/8250/8250_pcilib.h b/drivers/tty/serial/8250/8250_pcilib.h
index 1aaf1b50ce9cc9d78c098e0495838c17eb8752cd..16a274574cdef938fe7700d30b19e75dbbd9b748 100644
--- a/drivers/tty/serial/8250/8250_pcilib.h
+++ b/drivers/tty/serial/8250/8250_pcilib.h
@@ -13,3 +13,5 @@ struct uart_8250_port;

int serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port, u8 bar,
unsigned int offset, int regshift);
+
+int serial_8250_warn_need_ioport(struct pci_dev *dev);
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 3509af7dc52b8816f2f5ab58f0d999696f7483e7..91369f542b0bc7fc1d044f24db9a4ac98b394660 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -338,6 +338,7 @@ static void default_serial_dl_write(struct uart_8250_port *up, u32 value)
serial_out(up, UART_DLM, value >> 8 & 0xff);
}

+#ifdef CONFIG_HAS_IOPORT
static unsigned int hub6_serial_in(struct uart_port *p, int offset)
{
offset = offset << p->regshift;
@@ -351,6 +352,7 @@ static void hub6_serial_out(struct uart_port *p, int offset, int value)
outb(p->hub6 - 1 + offset, p->iobase);
outb(value, p->iobase + 1);
}
+#endif /* CONFIG_HAS_IOPORT */

static unsigned int mem_serial_in(struct uart_port *p, int offset)
{
@@ -400,6 +402,7 @@ static unsigned int mem32be_serial_in(struct uart_port *p, int offset)
return ioread32be(p->membase + offset);
}

+#ifdef CONFIG_HAS_IOPORT
static unsigned int io_serial_in(struct uart_port *p, int offset)
{
offset = offset << p->regshift;
@@ -411,6 +414,15 @@ static void io_serial_out(struct uart_port *p, int offset, int value)
offset = offset << p->regshift;
outb(value, p->iobase + offset);
}
+#endif
+static unsigned int no_serial_in(struct uart_port *p, int offset)
+{
+ return (unsigned int)-1;
+}
+
+static void no_serial_out(struct uart_port *p, int offset, int value)
+{
+}

static int serial8250_default_handle_irq(struct uart_port *port);

@@ -422,10 +434,12 @@ static void set_io_from_upio(struct uart_port *p)
up->dl_write = default_serial_dl_write;

switch (p->iotype) {
+#ifdef CONFIG_HAS_IOPORT
case UPIO_HUB6:
p->serial_in = hub6_serial_in;
p->serial_out = hub6_serial_out;
break;
+#endif

case UPIO_MEM:
p->serial_in = mem_serial_in;
@@ -446,11 +460,16 @@ static void set_io_from_upio(struct uart_port *p)
p->serial_in = mem32be_serial_in;
p->serial_out = mem32be_serial_out;
break;
-
- default:
+#ifdef CONFIG_HAS_IOPORT
+ case UPIO_PORT:
p->serial_in = io_serial_in;
p->serial_out = io_serial_out;
break;
+#endif
+ default:
+ WARN(1, "Unsupported UART type %x\n", p->iotype);
+ p->serial_in = no_serial_in;
+ p->serial_out = no_serial_out;
}
/* Remember loaded iotype */
up->cur_iotype = p->iotype;
@@ -1174,7 +1193,7 @@ static void autoconfig(struct uart_8250_port *up)
*/
scratch = serial_in(up, UART_IER);
serial_out(up, UART_IER, 0);
-#ifdef __i386__
+#if defined(__i386__) && defined(CONFIG_HAS_IOPORT)
outb(0xff, 0x080);
#endif
/*
@@ -1183,7 +1202,7 @@ static void autoconfig(struct uart_8250_port *up)
*/
scratch2 = serial_in(up, UART_IER) & UART_IER_ALL_INTR;
serial_out(up, UART_IER, UART_IER_ALL_INTR);
-#ifdef __i386__
+#if defined(__i386__) && defined(CONFIG_HAS_IOPORT)
outb(0, 0x080);
#endif
scratch3 = serial_in(up, UART_IER) & UART_IER_ALL_INTR;
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 47ff50763c048c89b19b7c9f13f462bc5368ab43..1eb20350fcf432d41cb416bed3be72ed8ab129bb 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -72,7 +72,7 @@ config SERIAL_8250_16550A_VARIANTS

config SERIAL_8250_FINTEK
bool "Support for Fintek variants"
- depends on SERIAL_8250
+ depends on SERIAL_8250 && HAS_IOPORT
help
Selecting this option will add support for the RS232 and RS485
capabilities of the Fintek F81216A LPC to 4 UART as well similar
@@ -163,7 +163,7 @@ config SERIAL_8250_HP300

config SERIAL_8250_CS
tristate "8250/16550 PCMCIA device support"
- depends on PCMCIA && SERIAL_8250
+ depends on PCMCIA && SERIAL_8250 && HAS_IOPORT
help
Say Y here to enable support for 16-bit PCMCIA serial devices,
including serial port cards, modems, and the modem functions of
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 28e4beeabf8f373fc76e09ea7d1c9d55a66f4964..45f0f779fbf960e9fa66375dbc44c379edc63bef 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -877,7 +877,7 @@ config SERIAL_TXX9_STDSERIAL

config SERIAL_JSM
tristate "Digi International NEO and Classic PCI Support"
- depends on PCI
+ depends on PCI && HAS_IOPORT
select SERIAL_CORE
help
This is a driver for Digi International's Neo and Classic series
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 4ab65874a850b4402ca3a7d3bdda597d7d5093f9..743b4afaad4c89a6028e592be2cae2643614c89b 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -505,7 +505,11 @@ struct uart_port {
* The remaining bits are serial-core specific and not modifiable by
* userspace.
*/
+#ifdef CONFIG_HAS_IOPORT
#define UPF_FOURPORT ((__force upf_t) ASYNC_FOURPORT /* 1 */ )
+#else
+#define UPF_FOURPORT 0
+#endif
#define UPF_SAK ((__force upf_t) ASYNC_SAK /* 2 */ )
#define UPF_SPD_HI ((__force upf_t) ASYNC_SPD_HI /* 4 */ )
#define UPF_SPD_VHI ((__force upf_t) ASYNC_SPD_VHI /* 5 */ )

--
2.43.0