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Code Issues Releases Wiki Activity

serial: stm32: Use of_device_get_match_data()

Browse source 
This driver casts away the constness of struct stm32_usart_info that is
pointed to by the of match table. Use of_device_get_match_data() instead
of of_match_device() here and push the const throughout the code so that
we don't cast away const. This nicely avoids referencing the match table
when it is undefined with configurations where CONFIG_OF=n and fixes the
const issues.

Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: <linux-serial@vger.kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210123034428.2841052-4-swboyd@chromium.org
This commit is contained in:
Stephen Boyd 2021-01-22 19:44:25 -08:00 committed by Rob Herring
parent 0e658fdd4b
commit d825f0bea2
2 changed files with 35 additions and 38 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

71
drivers/tty/serial/stm32-usart.c
View file

@ -99,8 +99,8 @@ static int stm32_config_rs485(struct uart_port *port,
struct serial_rs485 *rs485conf)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct stm32_usart_config *cfg = &stm32_port->info->cfg;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_config *cfg = &stm32_port->info->cfg;
u32 usartdiv, baud, cr1, cr3;
bool over8;
@ -166,7 +166,7 @@ static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
bool threaded)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
enum dma_status status;
struct dma_tx_state state;
@ -191,7 +191,7 @@ static unsigned long stm32_get_char(struct uart_port *port, u32 *sr,
int *last_res)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long c;
if (stm32_port->rx_ch) {
@ -211,7 +211,7 @@ static void stm32_receive_chars(struct uart_port *port, bool threaded)
{
struct tty_port *tport = &port->state->port;
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long c;
u32 sr;
char flag;
@ -282,7 +282,7 @@ static void stm32_tx_dma_complete(void *arg)
{
struct uart_port *port = arg;
struct stm32_port *stm32port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
stm32port->tx_dma_busy = false;
@ -294,7 +294,7 @@ static void stm32_tx_dma_complete(void *arg)
static void stm32_tx_interrupt_enable(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
/*
* Enables TX FIFO threashold irq when FIFO is enabled,
@ -309,7 +309,7 @@ static void stm32_tx_interrupt_enable(struct uart_port *port)
static void stm32_tx_interrupt_disable(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
if (stm32_port->fifoen)
stm32_clr_bits(port, ofs->cr3, USART_CR3_TXFTIE);
@ -320,7 +320,7 @@ static void stm32_tx_interrupt_disable(struct uart_port *port)
static void stm32_transmit_chars_pio(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct circ_buf *xmit = &port->state->xmit;
if (stm32_port->tx_dma_busy) {
@ -347,7 +347,7 @@ static void stm32_transmit_chars_pio(struct uart_port *port)
static void stm32_transmit_chars_dma(struct uart_port *port)
{
struct stm32_port *stm32port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
struct circ_buf *xmit = &port->state->xmit;
struct dma_async_tx_descriptor *desc = NULL;
unsigned int count, i;
@ -407,7 +407,7 @@ static void stm32_transmit_chars_dma(struct uart_port *port)
static void stm32_transmit_chars(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct circ_buf *xmit = &port->state->xmit;
if (port->x_char) {
@ -447,7 +447,7 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
u32 sr;
spin_lock(&port->lock);
@ -494,7 +494,7 @@ static irqreturn_t stm32_threaded_interrupt(int irq, void *ptr)
static unsigned int stm32_tx_empty(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
return readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE;
}
@ -502,7 +502,7 @@ static unsigned int stm32_tx_empty(struct uart_port *port)
static void stm32_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
stm32_set_bits(port, ofs->cr3, USART_CR3_RTSE);
@ -579,7 +579,7 @@ static void stm32_start_tx(struct uart_port *port)
static void stm32_throttle(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
@ -594,7 +594,7 @@ static void stm32_throttle(struct uart_port *port)
static void stm32_unthrottle(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
@ -609,7 +609,7 @@ static void stm32_unthrottle(struct uart_port *port)
static void stm32_stop_rx(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
stm32_clr_bits(port, ofs->cr1, stm32_port->cr1_irq);
if (stm32_port->cr3_irq)
@ -625,7 +625,7 @@ static void stm32_break_ctl(struct uart_port *port, int break_state)
static int stm32_startup(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const char *name = to_platform_device(port->dev)->name;
u32 val;
int ret;
@ -661,8 +661,8 @@ static int stm32_startup(struct uart_port *port)
static void stm32_shutdown(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct stm32_usart_config *cfg = &stm32_port->info->cfg;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_config *cfg = &stm32_port->info->cfg;
u32 val, isr;
int ret;
@ -721,8 +721,8 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct stm32_usart_config *cfg = &stm32_port->info->cfg;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_config *cfg = &stm32_port->info->cfg;
struct serial_rs485 *rs485conf = &port->rs485;
unsigned int baud, bits;
u32 usartdiv, mantissa, fraction, oversampling;
@ -921,8 +921,8 @@ static void stm32_pm(struct uart_port *port, unsigned int state,
{
struct stm32_port *stm32port = container_of(port,
struct stm32_port, port);
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
struct stm32_usart_config *cfg = &stm32port->info->cfg;
const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
const struct stm32_usart_config *cfg = &stm32port->info->cfg;
unsigned long flags = 0;
switch (state) {
@ -1081,7 +1081,7 @@ MODULE_DEVICE_TABLE(of, stm32_match);
static int stm32_of_dma_rx_probe(struct stm32_port *stm32port,
struct platform_device *pdev)
{
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
struct uart_port *port = &stm32port->port;
struct device *dev = &pdev->dev;
struct dma_slave_config config;
@ -1152,7 +1152,7 @@ static int stm32_of_dma_rx_probe(struct stm32_port *stm32port,
static int stm32_of_dma_tx_probe(struct stm32_port *stm32port,
struct platform_device *pdev)
{
struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
struct uart_port *port = &stm32port->port;
struct device *dev = &pdev->dev;
struct dma_slave_config config;
@ -1202,7 +1202,6 @@ static int stm32_of_dma_tx_probe(struct stm32_port *stm32port,
static int stm32_serial_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct stm32_port *stm32port;
int ret;
@ -1210,10 +1209,8 @@ static int stm32_serial_probe(struct platform_device *pdev)
if (!stm32port)
return -ENODEV;
match = of_match_device(stm32_match, &pdev->dev);
if (match && match->data)
stm32port->info = (struct stm32_usart_info *)match->data;
else
stm32port->info = of_device_get_match_data(&pdev->dev);
if (!stm32port->info)
return -EINVAL;
ret = stm32_init_port(stm32port, pdev);
@ -1272,7 +1269,7 @@ static int stm32_serial_remove(struct platform_device *pdev)
{
struct uart_port *port = platform_get_drvdata(pdev);
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
int err;
pm_runtime_get_sync(&pdev->dev);
@ -1317,7 +1314,7 @@ static int stm32_serial_remove(struct platform_device *pdev)
static void stm32_console_putchar(struct uart_port *port, int ch)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
while (!(readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE))
cpu_relax();
@ -1329,8 +1326,8 @@ static void stm32_console_write(struct console *co, const char *s, unsigned cnt)
{
struct uart_port *port = &stm32_ports[co->index].port;
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct stm32_usart_config *cfg = &stm32_port->info->cfg;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_config *cfg = &stm32_port->info->cfg;
unsigned long flags;
u32 old_cr1, new_cr1;
int locked = 1;
@ -1416,8 +1413,8 @@ static void __maybe_unused stm32_serial_enable_wakeup(struct uart_port *port,
bool enable)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
struct stm32_usart_config *cfg = &stm32_port->info->cfg;
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
const struct stm32_usart_config *cfg = &stm32_port->info->cfg;
u32 val;
if (stm32_port->wakeirq <= 0)

2
drivers/tty/serial/stm32-usart.h
View file

@ -259,7 +259,7 @@ struct stm32_usart_info stm32h7_info = {
struct stm32_port {
struct uart_port port;
struct clk *clk;
struct stm32_usart_info *info;
const struct stm32_usart_info *info;
struct dma_chan *rx_ch; /* dma rx channel */
dma_addr_t rx_dma_buf; /* dma rx buffer bus address */
unsigned char *rx_buf; /* dma rx buffer cpu address */