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Diffstat (limited to 'arch/powerpc/platforms/86xx/mpc8610_hpcd.c')
-rw-r--r--arch/powerpc/platforms/86xx/mpc8610_hpcd.c107
1 files changed, 48 insertions, 59 deletions
diff --git a/arch/powerpc/platforms/86xx/mpc8610_hpcd.c b/arch/powerpc/platforms/86xx/mpc8610_hpcd.c
index a896511690c2..74e018ef724b 100644
--- a/arch/powerpc/platforms/86xx/mpc8610_hpcd.c
+++ b/arch/powerpc/platforms/86xx/mpc8610_hpcd.c
@@ -39,12 +39,19 @@
#include <sysdev/fsl_pci.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/simple_gpio.h>
+#include <asm/fsl_guts.h>
#include "mpc86xx.h"
static struct device_node *pixis_node;
static unsigned char *pixis_bdcfg0, *pixis_arch;
+/* DIU Pixel Clock bits of the CLKDVDR Global Utilities register */
+#define CLKDVDR_PXCKEN 0x80000000
+#define CLKDVDR_PXCKINV 0x10000000
+#define CLKDVDR_PXCKDLY 0x06000000
+#define CLKDVDR_PXCLK_MASK 0x001F0000
+
#ifdef CONFIG_SUSPEND
static irqreturn_t mpc8610_sw9_irq(int irq, void *data)
{
@@ -205,72 +212,54 @@ void mpc8610hpcd_set_monitor_port(int monitor_port)
bdcfg[monitor_port]);
}
+/**
+ * mpc8610hpcd_set_pixel_clock: program the DIU's clock
+ *
+ * @pixclock: the wavelength, in picoseconds, of the clock
+ */
void mpc8610hpcd_set_pixel_clock(unsigned int pixclock)
{
- u32 __iomem *clkdvdr;
- u32 temp;
- /* variables for pixel clock calcs */
- ulong bestval, bestfreq, speed_ccb, minpixclock, maxpixclock;
- ulong pixval;
- long err;
- int i;
-
- clkdvdr = ioremap(get_immrbase() + 0xe0800, sizeof(u32));
- if (!clkdvdr) {
- printk(KERN_ERR "Err: can't map clock divider register!\n");
+ struct device_node *guts_np = NULL;
+ struct ccsr_guts_86xx __iomem *guts;
+ unsigned long freq;
+ u64 temp;
+ u32 pxclk;
+
+ /* Map the global utilities registers. */
+ guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
+ if (!guts_np) {
+ pr_err("mpc8610hpcd: missing global utilties device node\n");
return;
}
- /* Pixel Clock configuration */
- speed_ccb = fsl_get_sys_freq();
-
- /* Calculate the pixel clock with the smallest error */
- /* calculate the following in steps to avoid overflow */
- pr_debug("DIU pixclock in ps - %d\n", pixclock);
- temp = 1000000000/pixclock;
- temp *= 1000;
- pixclock = temp;
- pr_debug("DIU pixclock freq - %u\n", pixclock);
-
- temp = pixclock * 5 / 100;
- pr_debug("deviation = %d\n", temp);
- minpixclock = pixclock - temp;
- maxpixclock = pixclock + temp;
- pr_debug("DIU minpixclock - %lu\n", minpixclock);
- pr_debug("DIU maxpixclock - %lu\n", maxpixclock);
- pixval = speed_ccb/pixclock;
- pr_debug("DIU pixval = %lu\n", pixval);
-
- err = 100000000;
- bestval = pixval;
- pr_debug("DIU bestval = %lu\n", bestval);
-
- bestfreq = 0;
- for (i = -1; i <= 1; i++) {
- temp = speed_ccb / ((pixval+i) + 1);
- pr_debug("DIU test pixval i= %d, pixval=%lu, temp freq. = %u\n",
- i, pixval, temp);
- if ((temp < minpixclock) || (temp > maxpixclock))
- pr_debug("DIU exceeds monitor range (%lu to %lu)\n",
- minpixclock, maxpixclock);
- else if (abs(temp - pixclock) < err) {
- pr_debug("Entered the else if block %d\n", i);
- err = abs(temp - pixclock);
- bestval = pixval+i;
- bestfreq = temp;
- }
+ guts = of_iomap(guts_np, 0);
+ of_node_put(guts_np);
+ if (!guts) {
+ pr_err("mpc8610hpcd: could not map global utilties device\n");
+ return;
}
- pr_debug("DIU chose = %lx\n", bestval);
- pr_debug("DIU error = %ld\n NomPixClk ", err);
- pr_debug("DIU: Best Freq = %lx\n", bestfreq);
- /* Modify PXCLK in GUTS CLKDVDR */
- pr_debug("DIU: Current value of CLKDVDR = 0x%08x\n", (*clkdvdr));
- temp = (*clkdvdr) & 0x2000FFFF;
- *clkdvdr = temp; /* turn off clock */
- *clkdvdr = temp | 0x80000000 | (((bestval) & 0x1F) << 16);
- pr_debug("DIU: Modified value of CLKDVDR = 0x%08x\n", (*clkdvdr));
- iounmap(clkdvdr);
+ /* Convert pixclock from a wavelength to a frequency */
+ temp = 1000000000000ULL;
+ do_div(temp, pixclock);
+ freq = temp;
+
+ /*
+ * 'pxclk' is the ratio of the platform clock to the pixel clock.
+ * On the MPC8610, the value programmed into CLKDVDR is the ratio
+ * minus one. The valid range of values is 2-31.
+ */
+ pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq) - 1;
+ pxclk = clamp_t(u32, pxclk, 2, 31);
+
+ /* Disable the pixel clock, and set it to non-inverted and no delay */
+ clrbits32(&guts->clkdvdr,
+ CLKDVDR_PXCKEN | CLKDVDR_PXCKDLY | CLKDVDR_PXCLK_MASK);
+
+ /* Enable the clock and set the pxclk */
+ setbits32(&guts->clkdvdr, CLKDVDR_PXCKEN | (pxclk << 16));
+
+ iounmap(guts);
}
ssize_t mpc8610hpcd_show_monitor_port(int monitor_port, char *buf)