ARM: S3C2440: move handling of fclk/n clock to platform code

s3c2440 uses fclk/n (fclk divided by n) clock as one of the possible clocks used
to generate the baud rate clock. The divider 'n' in this case can be logically
represented outside of the uart controller.

This patch creates a new clock by name "fclk_n" for s3c2440 based platforms to
represent the fclk/n clock in the platform code. This clock provides a get_rate
callback that checks the UCON0/1/2 registers to determine the clock rate. The
samsung uart driver would receive the "fclk_n" clock name as one of the possible
baud rate clock options and the driver need not determine clock rate of fclk/n.

Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

2 files changed, 3 insertions, 51 deletions

diff --git a/drivers/tty/serial/s3c2440.c b/drivers/tty/serial/s3c2440.c
index 1d0c324b813f..4498828630f1 100644
--- a/drivers/tty/serial/s3c2440.c
+++ b/drivers/tty/serial/s3c2440.c
@@ -39,7 +39,7 @@ static int s3c2440_serial_setsource(struct uart_port *port,
                 ucon |= S3C2440_UCON_UCLK;
         else if (strcmp(clk->name, "pclk") == 0)
                 ucon |= S3C2440_UCON_PCLK;
-        else if (strcmp(clk->name, "fclk") == 0)
+        else if (strcmp(clk->name, "fclk_n") == 0)
                 ucon |= S3C2440_UCON_FCLK;
         else {
                 printk(KERN_ERR "unknown clock source %s\n", clk->name);
@@ -55,7 +55,6 @@ static int s3c2440_serial_getsource(struct uart_port *port,
                                     struct s3c24xx_uart_clksrc *clk)
 {
         unsigned long ucon = rd_regl(port, S3C2410_UCON);
-        unsigned long ucon0, ucon1, ucon2;
 
         switch (ucon & S3C2440_UCON_CLKMASK) {
         case S3C2440_UCON_UCLK:
@@ -70,34 +69,8 @@ static int s3c2440_serial_getsource(struct uart_port *port,
                 break;
 
         case S3C2440_UCON_FCLK:
-                /* the fun of calculating the uart divisors on
-                 * the s3c2440 */
-
-                ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON);
-                ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON);
-                ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON);
-
-                printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2);
-
-                ucon0 &= S3C2440_UCON0_DIVMASK;
-                ucon1 &= S3C2440_UCON1_DIVMASK;
-                ucon2 &= S3C2440_UCON2_DIVMASK;
-
-                if (ucon0 != 0) {
-                        clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT;
-                        clk->divisor += 6;
-                } else if (ucon1 != 0) {
-                        clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT;
-                        clk->divisor += 21;
-                } else if (ucon2 != 0) {
-                        clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT;
-                        clk->divisor += 36;
-                } else {
-                        /* manual calims 44, seems to be 9 */
-                        clk->divisor = 9;
-                }
-
-                clk->name = "fclk";
+                clk->divisor = 1;
+                clk->name = "fclk_n";
                 break;
         }
 
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 51cfb9f11665..fc242b2fd368 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -649,27 +649,6 @@ static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
                 if (cfg->clocks_size == 0)
                         clkp = &tmp_clksrc;
 
-                /* check to see if we're sourcing fclk, and if so we're
-                 * going to have to update the clock source
-                 */
-
-                if (strcmp(clkp->name, "fclk") == 0) {
-                        struct s3c24xx_uart_clksrc src;
-
-                        s3c24xx_serial_getsource(port, &src);
-
-                        /* check that the port already using fclk, and if
-                         * not, then re-select fclk
-                         */
-
-                        if (strcmp(src.name, clkp->name) == 0) {
-                                s3c24xx_serial_setsource(port, clkp);
-                                s3c24xx_serial_getsource(port, &src);
-                        }
-
-                        clkp->divisor = src.divisor;
-                }
-
                 s3c24xx_serial_calcbaud(res, port, clkp, baud);
                 best = res;
                 resptr = best + 1;