Instead of defining a new field in the uart_amba_port structure, use the
existing iotype field of the uart_port structure, which is intended for
this purpose. If we need to use 32-bit register access, we set iotype
to UPIO_MEM32, otherwise we set it to UPIO_MEM.
For early console, specify the "mmio32" option on the kernel command-line.
Example:
earlycon=pl011,mmio32,0x3ced1000
Signed-off-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 5 ++++-
drivers/tty/serial/amba-pl011.c | 16 +++++++++-------
2 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 474ce69..ab11d5c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -995,10 +995,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
unspecified, the h/w is not initialized.
pl011,<addr>
+ pl011,mmio32,<addr>
Start an early, polled-mode console on a pl011 serial
port at the specified address. The pl011 serial port
must already be setup and configured. Options are not
- yet supported.
+ yet supported. If 'mmio32' is specified, then only
+ the driver will use only 32-bit accessors to read/write
+ the device registers.
msm_serial,<addr>
Start an early, polled-mode console on an msm serial
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 06f827a..f2793c1 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -239,7 +239,6 @@ struct uart_amba_port {
unsigned int fifosize; /* vendor-specific */
unsigned int old_cr; /* state during shutdown */
bool autorts;
- bool access_32b;
unsigned int fixed_baud; /* vendor-set fixed baud rate */
char type[12];
#ifdef CONFIG_DMA_ENGINE
@@ -263,7 +262,8 @@ static unsigned int pl011_read(const struct uart_amba_port *uap,
{
void __iomem *addr = uap->port.membase + pl011_reg_to_offset(uap, reg);
- return uap->access_32b ? readl_relaxed(addr) : readw_relaxed(addr);
+ return (uap->port.iotype == UPIO_MEM32) ?
+ readl_relaxed(addr) : readw_relaxed(addr);
}
static void pl011_write(unsigned int val, const struct uart_amba_port *uap,
@@ -271,7 +271,7 @@ static void pl011_write(unsigned int val, const struct uart_amba_port *uap,
{
void __iomem *addr = uap->port.membase + pl011_reg_to_offset(uap, reg);
- if (uap->access_32b)
+ if (uap->port.iotype == UPIO_MEM32)
writel_relaxed(val, addr);
else
writew_relaxed(val, addr);
@@ -2304,7 +2304,10 @@ static void pl011_putc(struct uart_port *port, int c)
{
while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
;
- writeb(c, port->membase + UART01x_DR);
+ if (port->iotype == UPIO_MEM32)
+ writel(c, port->membase + UART01x_DR);
+ else
+ writeb(c, port->membase + UART01x_DR);
while (readl(port->membase + UART01x_FR) & UART011_FR_BUSY)
;
}
@@ -2417,7 +2420,6 @@ static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap,
uap->port.dev = dev;
uap->port.mapbase = mmiobase->start;
uap->port.membase = base;
- uap->port.iotype = UPIO_MEM;
uap->port.fifosize = uap->fifosize;
uap->port.flags = UPF_BOOT_AUTOCONF;
uap->port.line = index;
@@ -2471,9 +2473,9 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
return PTR_ERR(uap->clk);
uap->reg_offset = vendor->reg_offset;
- uap->access_32b = vendor->access_32b;
uap->vendor = vendor;
uap->fifosize = vendor->get_fifosize(dev);
+ uap->port.iotype = vendor->access_32b ? UPIO_MEM32 : UPIO_MEM;
uap->port.irq = dev->irq[0];
uap->port.ops = &amba_pl011_pops;
@@ -2552,9 +2554,9 @@ static int sbsa_uart_probe(struct platform_device *pdev)
return -ENOMEM;
uap->reg_offset = vendor_sbsa.reg_offset;
- uap->access_32b = vendor_sbsa.access_32b;
uap->vendor = &vendor_sbsa;
uap->fifosize = 32;
+ uap->port.iotype = vendor_sbsa.access_32b ? UPIO_MEM32 : UPIO_MEM;
uap->port.irq = platform_get_irq(pdev, 0);
uap->port.ops = &sbsa_uart_pops;
uap->fixed_baud = baudrate;
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.
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