sh-sci: improve clock framework support

Use enable/disable hooks for clock framework integration.
Make sure we control the clock for the serial console as well.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 47 insertions, 31 deletions

diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 408624ae7fe..3daf76725ac 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -76,8 +76,10 @@ struct sci_port {
         int                     break_flag;
 
 #ifdef CONFIG_HAVE_CLK
-        /* Port clock */
-        struct clk              *clk;
+        /* Interface clock */
+        struct clk              *iclk;
+        /* Data clock */
+        struct clk              *dclk;
 #endif
         struct list_head        node;
 };
@@ -166,12 +168,12 @@ static void h8300_sci_config(struct uart_port *port, unsigned int ctrl)
                 *mstpcrl &= ~mask;
 }
 
-static inline void h8300_sci_enable(struct uart_port *port)
+static void h8300_sci_enable(struct uart_port *port)
 {
         h8300_sci_config(port, sci_enable);
 }
 
-static inline void h8300_sci_disable(struct uart_port *port)
+static void h8300_sci_disable(struct uart_port *port)
 {
         h8300_sci_config(port, sci_disable);
 }
@@ -742,13 +744,34 @@ static int sci_notifier(struct notifier_block *self,
             (phase == CPUFREQ_RESUMECHANGE)) {
                 spin_lock_irqsave(&priv->lock, flags);
                 list_for_each_entry(sci_port, &priv->ports, node)
-                        sci_port->port.uartclk = clk_get_rate(sci_port->clk);
+                        sci_port->port.uartclk = clk_get_rate(sci_port->dclk);
 
                 spin_unlock_irqrestore(&priv->lock, flags);
         }
 
         return NOTIFY_OK;
 }
+
+static void sci_clk_enable(struct uart_port *port)
+{
+        struct sci_port *sci_port = to_sci_port(port);
+
+        clk_enable(sci_port->dclk);
+        sci_port->port.uartclk = clk_get_rate(sci_port->dclk);
+
+        if (sci_port->iclk)
+                clk_enable(sci_port->iclk);
+}
+
+static void sci_clk_disable(struct uart_port *port)
+{
+        struct sci_port *sci_port = to_sci_port(port);
+
+        if (sci_port->iclk)
+                clk_disable(sci_port->iclk);
+
+        clk_disable(sci_port->dclk);
+}
 #endif
 
 static int sci_request_irq(struct sci_port *port)
@@ -880,10 +903,6 @@ static int sci_startup(struct uart_port *port)
         if (s->enable)
                 s->enable(port);
 
-#ifdef CONFIG_HAVE_CLK
-        s->clk = clk_get(NULL, "module_clk");
-#endif
-
         sci_request_irq(s);
         sci_start_tx(port);
         sci_start_rx(port, 1);
@@ -901,11 +920,6 @@ static void sci_shutdown(struct uart_port *port)
 
         if (s->disable)
                 s->disable(port);
-
-#ifdef CONFIG_HAVE_CLK
-        clk_put(s->clk);
-        s->clk = NULL;
-#endif
 }
 
 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
@@ -1048,7 +1062,8 @@ static struct uart_ops sci_uart_ops = {
 #endif
 };
 
-static void __devinit sci_init_single(struct sci_port *sci_port,
+static void __devinit sci_init_single(struct platform_device *dev,
+                                      struct sci_port *sci_port,
                                       unsigned int index,
                                       struct plat_sci_port *p)
 {
@@ -1064,14 +1079,10 @@ static void __devinit sci_init_single(struct sci_port *sci_port,
 #endif
         sci_port->port.uartclk  = CONFIG_CPU_CLOCK;
 #elif defined(CONFIG_HAVE_CLK)
-        /*
-         * XXX: We should use a proper SCI/SCIF clock
-         */
-        {
-                struct clk *clk = clk_get(NULL, "module_clk");
-                sci_port->port.uartclk = clk_get_rate(clk);
-                clk_put(clk);
-        }
+        sci_port->iclk          = p->clk ? clk_get(&dev->dev, p->clk) : NULL;
+        sci_port->dclk          = clk_get(&dev->dev, "module_clk");
+        sci_port->enable        = sci_clk_enable;
+        sci_port->disable       = sci_clk_disable;
 #else
 #error "Need a valid uartclk"
 #endif
@@ -1085,9 +1096,11 @@ static void __devinit sci_init_single(struct sci_port *sci_port,
 
         sci_port->port.irq      = p->irqs[SCIx_TXI_IRQ];
         sci_port->port.flags    = p->flags;
+        sci_port->port.dev      = &dev->dev;
         sci_port->type          = sci_port->port.type = p->type;
 
         memcpy(&sci_port->irqs, &p->irqs, sizeof(p->irqs));
+
 }
 
 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
@@ -1111,14 +1124,21 @@ static void serial_console_write(struct console *co, const char *s,
                                  unsigned count)
 {
         struct uart_port *port = co->data;
+        struct sci_port *sci_port = to_sci_port(port);
         unsigned short bits;
 
-        uart_console_write(co->data, s, count, serial_console_putchar);
+        if (sci_port->enable)
+                sci_port->enable(port);
+
+        uart_console_write(port, s, count, serial_console_putchar);
 
         /* wait until fifo is empty and last bit has been transmitted */
         bits = SCxSR_TDxE(port) | SCxSR_TEND(port);
         while ((sci_in(port, SCxSR) & bits) != bits)
                 cpu_relax();
+
+        if (sci_port->disable);
+                sci_port->disable(port);
 }
 
 static int __init serial_console_setup(struct console *co, char *options)
@@ -1152,11 +1172,6 @@ static int __init serial_console_setup(struct console *co, char *options)
         if (!port->type)
                 return -ENODEV;
 
-#ifdef CONFIG_HAVE_CLK
-        if (!sci_port->clk)
-                sci_port->clk = clk_get(NULL, "module_clk");
-#endif
-
         sci_config_port(port, 0);
 
         if (sci_port->enable)
@@ -1171,6 +1186,7 @@ static int __init serial_console_setup(struct console *co, char *options)
         if (ret == 0)
                 sci_stop_rx(port);
 #endif
+        /* TODO: disable clock */
         return ret;
 }
 
@@ -1250,8 +1266,7 @@ static int __devinit sci_probe_single(struct platform_device *dev,
                 return 0;
         }
 
-        sciport->port.dev = &dev->dev;
-        sci_init_single(sciport, index, p);
+        sci_init_single(dev, sciport, index, p);
 
         ret = uart_add_one_port(&sci_uart_driver, &sciport->port);
         if (ret)
diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h
index 717059d6791..1c297ddc9d5 100644
--- a/include/linux/serial_sci.h
+++ b/include/linux/serial_sci.h
@@ -25,6 +25,7 @@ struct plat_sci_port {
         unsigned int    irqs[SCIx_NR_IRQS];     /* ERI, RXI, TXI, BRI */
         unsigned int    type;                   /* SCI / SCIF / IRDA */
         upf_t           flags;                  /* UPF_* flags */
+        char            *clk;                   /* clock string */
 };
 
 #endif /* __LINUX_SERIAL_SCI_H */