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authorwdenk <wdenk>2004-02-11 21:35:18 +0000
committerwdenk <wdenk>2004-02-11 21:35:18 +0000
commita2d18bb7d31e7b971386fef505ff0218f3b6e893 (patch)
tree3230d5f1333740d174aae9901acde345be1a333f
parentcd37d9e6e5e9692d8efafc155df23fa142b63d03 (diff)
downloadu-boot-linaro-natty-a2d18bb7d31e7b971386fef505ff0218f3b6e893.tar.gz
* Make sure to use a bus clock divider of 2 only when running TQM8xxMLABEL_2004_02_11_2240
modules at CPU clock frequencies above 66 MHz. * Optimize flash programming speed for LWMON (by another 100% :-)
-rw-r--r--CHANGELOG5
-rw-r--r--cpu/mpc8xx/speed.c46
-rw-r--r--include/configs/lwmon.h6
3 files changed, 38 insertions, 19 deletions
diff --git a/CHANGELOG b/CHANGELOG
index 194564a13..6c853c134 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,11 @@
Changes since U-Boot 1.0.1:
======================================================================
+* Make sure to use a bus clock divider of 2 only when running TQM8xxM
+ modules at CPU clock frequencies above 66 MHz.
+
+* Optimize flash programming speed for LWMON (by another 100% :-)
+
* Patch by Jian Zhang, 3 Feb 2004:
- Changed the incorrect FAT12BUFSIZE
- data_begin in fsdata can be negative. Changed it to be short.
diff --git a/cpu/mpc8xx/speed.c b/cpu/mpc8xx/speed.c
index 8f8efce50..aebfbcb1d 100644
--- a/cpu/mpc8xx/speed.c
+++ b/cpu/mpc8xx/speed.c
@@ -64,18 +64,18 @@ static __inline__ void set_msr(unsigned long msr)
* These strange values for the timing interval and prescaling are used
* because the formula for the CPU clock is:
*
- * CPU clock = count * (177 * (8192 / 58))
+ * CPU clock = count * (177 * (8192 / 58))
*
- * = count * 24999.7241
+ * = count * 24999.7241
*
- * which is very close to
+ * which is very close to
*
- * = count * 25000
+ * = count * 25000
*
* Since the count gives the CPU clock divided by 25000, we can get
* the CPU clock rounded to the nearest 0.1 MHz by
*
- * CPU clock = ((count + 2) / 4) * 100000;
+ * CPU clock = ((count + 2) / 4) * 100000;
*
* The rounding is important since the measurement is sometimes going
* to be high or low by 0.025 MHz, depending on exactly how the clocks
@@ -112,8 +112,8 @@ unsigned long measure_gclk(void)
*/
timerp->cpmt_tmr2 = ((177 - 1) << TMR_PS_SHIFT) | TMR_ICLK_IN_GEN;
- timerp->cpmt_tcn2 = 0; /* reset state */
- timerp->cpmt_tgcr |= TGCR_RST2; /* enable timer 2 */
+ timerp->cpmt_tcn2 = 0; /* reset state */
+ timerp->cpmt_tgcr |= TGCR_RST2; /* enable timer 2 */
/*
* PIT setup:
@@ -148,9 +148,9 @@ unsigned long measure_gclk(void)
/* spin until get exact count when we want to start */
while (immr->im_sit.sit_pitr > SPEED_PITC);
- timerp->cpmt_tgcr &= ~TGCR_STP2; /* Start Timer 2 */
+ timerp->cpmt_tgcr &= ~TGCR_STP2; /* Start Timer 2 */
while ((immr->im_sit.sit_piscr & PISCR_PS) == 0);
- timerp->cpmt_tgcr |= TGCR_STP2; /* Stop Timer 2 */
+ timerp->cpmt_tgcr |= TGCR_STP2; /* Stop Timer 2 */
/* re-enable external interrupts if they were on */
set_msr (msr_val);
@@ -166,7 +166,7 @@ unsigned long measure_gclk(void)
/* not using OSCM, using XIN, so scale appropriately */
return (((timer2_val + 2) / 4) * (CFG_8XX_XIN/512))/8192 * 100000L;
#else
- return ((timer2_val + 2) / 4) * 100000L; /* convert to Hz */
+ return ((timer2_val + 2) / 4) * 100000L; /* convert to Hz */
#endif
}
@@ -224,8 +224,9 @@ int get_clocks_866 (void)
DECLARE_GLOBAL_DATA_PTR;
volatile immap_t *immr = (immap_t *) CFG_IMMR;
- char tmp[64];
- long cpuclk = 0;
+ char tmp[64];
+ long cpuclk = 0;
+ long sccr_reg;
if (getenv_r ("cpuclk", tmp, sizeof (tmp)) > 0)
cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
@@ -238,10 +239,19 @@ int get_clocks_866 (void)
gd->cpu_clk = measure_gclk ();
#endif
- if ((immr->im_clkrst.car_sccr & SCCR_EBDF11) == 0)
+ /* if cpu clock <= 66 MHz then set bus division factor to 1,
+ * otherwise set it to 2
+ */
+ sccr_reg = immr->im_clkrst.car_sccr;
+ sccr_reg &= ~SCCR_EBDF11;
+ if (gd->cpu_clk <= 66000000) {
+ sccr_reg |= SCCR_EBDF00; /* bus division factor = 1 */
gd->bus_clk = gd->cpu_clk;
- else
+ } else {
+ sccr_reg |= SCCR_EBDF01; /* bus division factor = 2 */
gd->bus_clk = gd->cpu_clk / 2;
+ }
+ immr->im_clkrst.car_sccr = sccr_reg;
return (0);
}
@@ -253,7 +263,7 @@ int sdram_adjust_866 (void)
DECLARE_GLOBAL_DATA_PTR;
volatile immap_t *immr = (immap_t *) CFG_IMMR;
- long mamr;
+ long mamr;
mamr = immr->im_memctl.memc_mamr;
mamr &= ~MAMR_PTA_MSK;
@@ -272,9 +282,9 @@ static long init_pll_866 (long clk)
extern void plprcr_write_866 (long);
volatile immap_t *immr = (immap_t *) CFG_IMMR;
- long n, plprcr;
- char mfi, mfn, mfd, s, pdf;
- long step_mfi, step_mfn;
+ long n, plprcr;
+ char mfi, mfn, mfd, s, pdf;
+ long step_mfi, step_mfn;
if (clk < 20000000) {
clk *= 2;
diff --git a/include/configs/lwmon.h b/include/configs/lwmon.h
index 4917258ba..d944ed88c 100644
--- a/include/configs/lwmon.h
+++ b/include/configs/lwmon.h
@@ -284,7 +284,11 @@
#define CFG_FLASH_WRITE_TOUT 600 /* Timeout for Flash Write (in ms) */
#define CFG_FLASH_USE_BUFFER_WRITE
#define CFG_FLASH_BUFFER_WRITE_TOUT 2048 /* Timeout for Flash Buffer Write (in ms) */
-#define CFG_FLASH_BUFFER_SIZE 32 /* Buffer size */
+/* Buffer size.
+ We have two flash devices connected in parallel.
+ Each device incorporates a Write Buffer of 32 bytes.
+ */
+#define CFG_FLASH_BUFFER_SIZE (2*32)
#if 1
/* Put environment in flash which is much faster to boot */