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serial: sh-sci: Dynamic clock management depends on HAVE_CLK. 

Presently this is conditionalized on sh, and disabled for sh64.
Now that SH-5 ties in to the clock framework, the sh64 exception
can be dropped. Additionally, ARM will want to use the same hooks
once SH-Mobile G3 grows clock framework support, so switch these
paths over to HAVE_CLK now.

Once the H8 and ARM sh-sci users hook up HAVE_CLK, the driver can
be switched over to having an outright dependency on it and the
ifdefs can go away.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2008-10-02 19:09:13 +09:00
parent bdeb3be7cc
commit a2159b5221
2 changed files with 16 additions and 31 deletions
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43
drivers/serial/sh-sci.c
View File

@ -78,7 +78,7 @@ struct sci_port {
struct timer_list break_timer; struct timer_list break_timer;
int break_flag; int break_flag;
#ifdef CONFIG_SUPERH #ifdef CONFIG_HAVE_CLK
/* Port clock */ /* Port clock */
struct clk *clk; struct clk *clk;
#endif #endif
@ -831,7 +831,7 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
return IRQ_HANDLED; return IRQ_HANDLED;
} }
#ifdef CONFIG_CPU_FREQ #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_HAVE_CLK)
/* /*
* Here we define a transistion notifier so that we can update all of our * Here we define a transistion notifier so that we can update all of our
* ports' baud rate when the peripheral clock changes. * ports' baud rate when the peripheral clock changes.
@ -860,7 +860,7 @@ static int sci_notifier(struct notifier_block *self,
* Clean this up later.. * Clean this up later..
*/ */
clk = clk_get(NULL, "module_clk"); clk = clk_get(NULL, "module_clk");
port->uartclk = clk_get_rate(clk) * 16; port->uartclk = clk_get_rate(clk);
clk_put(clk); clk_put(clk);
} }
@ -873,7 +873,7 @@ static int sci_notifier(struct notifier_block *self,
} }
static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 }; static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
#endif /* CONFIG_CPU_FREQ */ #endif /* CONFIG_CPU_FREQ && CONFIG_HAVE_CLK */
static int sci_request_irq(struct sci_port *port) static int sci_request_irq(struct sci_port *port)
{ {
@ -1008,7 +1008,7 @@ static int sci_startup(struct uart_port *port)
if (s->enable) if (s->enable)
s->enable(port); s->enable(port);
#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) #ifdef CONFIG_HAVE_CLK
s->clk = clk_get(NULL, "module_clk"); s->clk = clk_get(NULL, "module_clk");
#endif #endif
@ -1030,7 +1030,7 @@ static void sci_shutdown(struct uart_port *port)
if (s->disable) if (s->disable)
s->disable(port); s->disable(port);
#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) #ifdef CONFIG_HAVE_CLK
clk_put(s->clk); clk_put(s->clk);
s->clk = NULL; s->clk = NULL;
#endif #endif
@ -1041,24 +1041,11 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
{ {
struct sci_port *s = &sci_ports[port->line]; struct sci_port *s = &sci_ports[port->line];
unsigned int status, baud, smr_val; unsigned int status, baud, smr_val;
int t; int t = -1;
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
if (likely(baud))
switch (baud) { t = SCBRR_VALUE(baud, port->uartclk);
case 0:
t = -1;
break;
default:
{
#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
t = SCBRR_VALUE(baud, clk_get_rate(s->clk));
#else
t = SCBRR_VALUE(baud);
#endif
break;
}
}
do { do {
status = sci_in(port, SCxSR); status = sci_in(port, SCxSR);
@ -1207,17 +1194,17 @@ static void __init sci_init_ports(void)
sci_ports[i].disable = h8300_sci_disable; sci_ports[i].disable = h8300_sci_disable;
#endif #endif
sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK; sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
#elif defined(CONFIG_SUPERH64) #elif defined(CONFIG_HAVE_CLK)
sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16;
#else
/* /*
* XXX: We should use a proper SCI/SCIF clock * XXX: We should use a proper SCI/SCIF clock
*/ */
{ {
struct clk *clk = clk_get(NULL, "module_clk"); struct clk *clk = clk_get(NULL, "module_clk");
sci_ports[i].port.uartclk = clk_get_rate(clk) * 16; sci_ports[i].port.uartclk = clk_get_rate(clk);
clk_put(clk); clk_put(clk);
} }
#else
#error "Need a valid uartclk"
#endif #endif
sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i]; sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
@ -1285,7 +1272,7 @@ static int __init serial_console_setup(struct console *co, char *options)
port->type = serial_console_port->type; port->type = serial_console_port->type;
#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) #ifdef CONFIG_HAVE_CLK
if (!serial_console_port->clk) if (!serial_console_port->clk)
serial_console_port->clk = clk_get(NULL, "module_clk"); serial_console_port->clk = clk_get(NULL, "module_clk");
#endif #endif
@ -1479,7 +1466,7 @@ static int __devinit sci_probe(struct platform_device *dev)
kgdb_putchar = kgdb_sci_putchar; kgdb_putchar = kgdb_sci_putchar;
#endif #endif
#ifdef CONFIG_CPU_FREQ #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_HAVE_CLK)
cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER); cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
dev_info(&dev->dev, "CPU frequency notifier registered\n"); dev_info(&dev->dev, "CPU frequency notifier registered\n");
#endif #endif

4
drivers/serial/sh-sci.h
View File

@ -793,9 +793,7 @@ static inline int sci_rxd_in(struct uart_port *port)
#elif defined(CONFIG_CPU_SUBTYPE_SH7723) #elif defined(CONFIG_CPU_SUBTYPE_SH7723)
#define SCBRR_VALUE(bps, clk) (((clk*2)+16*bps)/(16*bps)-1) #define SCBRR_VALUE(bps, clk) (((clk*2)+16*bps)/(16*bps)-1)
#elif defined(__H8300H__) || defined(__H8300S__) #elif defined(__H8300H__) || defined(__H8300S__)
#define SCBRR_VALUE(bps) (((CONFIG_CPU_CLOCK*1000/32)/bps)-1) #define SCBRR_VALUE(bps, clk) (((clk*1000/32)/bps)-1)
#elif defined(CONFIG_SUPERH64)
#define SCBRR_VALUE(bps) ((current_cpu_data.module_clock+16*bps)/(32*bps)-1)
#else /* Generic SH */ #else /* Generic SH */
#define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1) #define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1)
#endif #endif