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Message-Id: <20240405152924.252598-2-schnelle@linux.ibm.com>
Date: Fri, 5 Apr 2024 17:29:24 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-serial@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
Heiko Carstens <hca@...ux.ibm.com>, linux-kernel@...r.kernel.org,
Niklas Schnelle <schnelle@...ux.ibm.com>
Subject: [PATCH 1/1] tty: serial: handle HAS_IOPORT dependencies
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. For 8250 based drivers some support
MMIO only use so fence only the parts requiring I/O ports.
Co-developed-by: Arnd Bergmann <arnd@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...nel.org>
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
Note: This patch does not depend any not-yet-mainline HAS_IOPORT changes
and may be merged via subsystem specific trees at your earliest
convenience.
Note 2: This was previously acked here:
https://lore.kernel.org/all/2023053050-prodigal-shine-4d1c@gregkh/
Given this was almost a year ago and didn't apply then I didn't
carry the Ack over though.
drivers/tty/Kconfig | 4 +--
drivers/tty/serial/8250/8250_early.c | 4 +++
drivers/tty/serial/8250/8250_pci.c | 14 ++++++++++
drivers/tty/serial/8250/8250_port.c | 42 +++++++++++++++++++++++-----
drivers/tty/serial/8250/Kconfig | 7 ++---
drivers/tty/serial/Kconfig | 2 +-
6 files changed, 59 insertions(+), 14 deletions(-)
diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index a45d423ad10f..63a494d36a1f 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 e3f482fd3de4..8f9aec2e7c7d 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 0d35c77fad9e..38ac5236d2ea 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -928,6 +928,7 @@ static int pci_netmos_init(struct pci_dev *dev)
return num_serial;
}
+#ifdef CONFIG_HAS_IOPORT
/*
* These chips are available with optionally one parallel port and up to
* two serial ports. Unfortunately they all have the same product id.
@@ -1054,6 +1055,7 @@ static void pci_ite887x_exit(struct pci_dev *dev)
ioport &= 0xffff;
release_region(ioport, ITE_887x_IOSIZE);
}
+#endif /* CONFIG_HAS_IOPORT */
/*
* Oxford Semiconductor Inc.
@@ -1328,6 +1330,7 @@ static int pci_oxsemi_tornado_setup(struct serial_private *priv,
#define QOPR_CLOCK_X8 0x0003
#define QOPR_CLOCK_RATE_MASK 0x0003
+#ifdef CONFIG_HAS_IOPORT
/* Quatech devices have their own extra interface features */
static struct pci_device_id quatech_cards[] = {
{ PCI_DEVICE_DATA(QUATECH, QSC100, 1) },
@@ -1547,6 +1550,7 @@ static int pci_quatech_setup(struct serial_private *priv,
pci_warn(priv->dev, "software control of RS422 features not currently supported.\n");
return pci_default_setup(priv, board, port, idx);
}
+#endif /* CONFIG_HAS_IOPORT */
static int pci_default_setup(struct serial_private *priv,
const struct pciserial_board *board,
@@ -1826,6 +1830,7 @@ static int skip_tx_en_setup(struct serial_private *priv,
return pci_default_setup(priv, board, port, idx);
}
+#ifdef CONFIG_HAS_IOPORT
static void kt_handle_break(struct uart_port *p)
{
struct uart_8250_port *up = up_to_u8250p(p);
@@ -1869,6 +1874,7 @@ static int kt_serial_setup(struct serial_private *priv,
port->port.handle_break = kt_handle_break;
return skip_tx_en_setup(priv, board, port, idx);
}
+#endif /* CONFIG_HAS_IOPORT */
static int pci_eg20t_init(struct pci_dev *dev)
{
@@ -1913,6 +1919,7 @@ pci_wch_ch38x_setup(struct serial_private *priv,
#define CH384_XINT_ENABLE_REG 0xEB
#define CH384_XINT_ENABLE_BIT 0x02
+#ifdef CONFIG_HAS_IOPORT
static int pci_wch_ch38x_init(struct pci_dev *dev)
{
int max_port;
@@ -1940,6 +1947,7 @@ static void pci_wch_ch38x_exit(struct pci_dev *dev)
iobase = pci_resource_start(dev, 0);
outb(0x0, iobase + CH384_XINT_ENABLE_REG);
}
+#endif /* CONFIG_HAS_IOPORT */
static int
@@ -2171,6 +2179,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
.subdevice = PCI_ANY_ID,
.setup = ce4100_serial_setup,
},
+#ifdef CONFIG_HAS_IOPORT
{
.vendor = PCI_VENDOR_ID_INTEL,
.device = PCI_DEVICE_ID_INTEL_PATSBURG_KT,
@@ -2190,6 +2199,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
.setup = pci_default_setup,
.exit = pci_ite887x_exit,
},
+#endif
/*
* National Instruments
*/
@@ -2311,6 +2321,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
.exit = pci_ni8430_exit,
},
/* Quatech */
+#ifdef CONFIG_HAS_IOPORT
{
.vendor = PCI_VENDOR_ID_QUATECH,
.device = PCI_ANY_ID,
@@ -2319,6 +2330,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
.init = pci_quatech_init,
.setup = pci_quatech_setup,
},
+#endif
/*
* Panacom
*/
@@ -2836,6 +2848,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
.subdevice = PCI_ANY_ID,
.setup = pci_wch_ch38x_setup,
},
+#ifdef CONFIG_HAS_IOPORT
/* WCH CH384 8S card (16850 clone) */
{
.vendor = PCIE_VENDOR_ID_WCH,
@@ -2846,6 +2859,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
.exit = pci_wch_ch38x_exit,
.setup = pci_wch_ch38x_setup,
},
+#endif
/*
* Broadcom TruManage (NetXtreme)
*/
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index fc9dd5d45295..1c5e39c1a469 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 +414,24 @@ 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)
+{
+}
+
+#ifdef CONFIG_HAS_IOPORT
+static inline bool is_upf_fourport(struct uart_port *port)
+{
+ return port->flags & UPF_FOURPORT;
+}
+#else
+#define is_upf_fourport(x) false
+#endif
static int serial8250_default_handle_irq(struct uart_port *port);
@@ -422,10 +443,12 @@ 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 +469,16 @@ 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;
@@ -1318,7 +1346,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
unsigned long irqs;
int irq;
- if (port->flags & UPF_FOURPORT) {
+ if (is_upf_fourport(port)) {
ICP = (port->iobase & 0xfe0) | 0x1f;
save_ICP = inb_p(ICP);
outb_p(0x80, ICP);
@@ -1337,7 +1365,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
irqs = probe_irq_on();
serial8250_out_MCR(up, 0);
udelay(10);
- if (port->flags & UPF_FOURPORT) {
+ if (is_upf_fourport(port)) {
serial8250_out_MCR(up, UART_MCR_DTR | UART_MCR_RTS);
} else {
serial8250_out_MCR(up,
@@ -1361,7 +1389,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
serial_out(up, UART_IER, save_ier);
uart_port_unlock_irq(port);
- if (port->flags & UPF_FOURPORT)
+ if (is_upf_fourport(port))
outb_p(save_ICP, ICP);
port->irq = (irq > 0) ? irq : 0;
@@ -2438,7 +2466,7 @@ int serial8250_do_startup(struct uart_port *port)
*/
up->ier = UART_IER_RLSI | UART_IER_RDI;
- if (port->flags & UPF_FOURPORT) {
+ if (is_upf_fourport(port)) {
unsigned int icp;
/*
* Enable interrupts on the AST Fourport board
@@ -2483,7 +2511,7 @@ void serial8250_do_shutdown(struct uart_port *port)
serial8250_release_dma(up);
uart_port_lock_irqsave(port, &flags);
- if (port->flags & UPF_FOURPORT) {
+ if (is_upf_fourport(port)) {
/* reset interrupts on the AST Fourport board */
inb((port->iobase & 0xfe0) | 0x1f);
port->mctrl |= TIOCM_OUT1;
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 47ff50763c04..54bf98869abf 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -6,7 +6,6 @@
config SERIAL_8250
tristate "8250/16550 and compatible serial support"
- depends on !S390
select SERIAL_CORE
select SERIAL_MCTRL_GPIO if GPIOLIB
help
@@ -72,7 +71,7 @@ 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
@@ -136,7 +135,7 @@ config SERIAL_8250_PCILIB
config SERIAL_8250_PCI
tristate "8250/16550 PCI device support"
- depends on SERIAL_8250 && PCI
+ depends on SERIAL_8250 && PCI && HAS_IOPORT
select SERIAL_8250_PCILIB
default SERIAL_8250
help
@@ -163,7 +162,7 @@ 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 ffcf4882b25f..92c85e805c2a 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -874,7 +874,7 @@ 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
--
2.40.1
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