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powerpc/t4qds: use clock measurement for sysclk and ddr clock
Use QIXIS measurement registers to obtain sysclk and ddr clock. This allows using non-standard clock speeds, set by directly writing to clock chip or store the values in qixis clock data eeprom. Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com> Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Andy Fleming <afleming@freescale.com>
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@ -540,6 +540,20 @@ int board_early_init_r(void)
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unsigned long get_board_sys_clk(void)
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{
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u8 sysclk_conf = QIXIS_READ(brdcfg[1]);
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#ifdef CONFIG_FSL_QIXIS_CLOCK_MEASUREMENT
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/* use accurate clock measurement */
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int freq = QIXIS_READ(clk_freq[0]) << 8 | QIXIS_READ(clk_freq[1]);
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int base = QIXIS_READ(clk_base[0]) << 8 | QIXIS_READ(clk_base[1]);
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u32 val;
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val = freq * base;
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if (val) {
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debug("SYS Clock measurement is: %d\n", val);
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return val;
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} else {
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printf("Warning: SYS clock measurement is invalid, using value from brdcfg1.\n");
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}
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#endif
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switch (sysclk_conf & 0x0F) {
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case QIXIS_SYSCLK_83:
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@ -563,6 +577,20 @@ unsigned long get_board_sys_clk(void)
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unsigned long get_board_ddr_clk(void)
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{
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u8 ddrclk_conf = QIXIS_READ(brdcfg[1]);
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#ifdef CONFIG_FSL_QIXIS_CLOCK_MEASUREMENT
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/* use accurate clock measurement */
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int freq = QIXIS_READ(clk_freq[2]) << 8 | QIXIS_READ(clk_freq[3]);
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int base = QIXIS_READ(clk_base[0]) << 8 | QIXIS_READ(clk_base[1]);
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u32 val;
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val = freq * base;
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if (val) {
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debug("DDR Clock measurement is: %d\n", val);
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return val;
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} else {
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printf("Warning: DDR clock measurement is invalid, using value from brdcfg1.\n");
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}
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#endif
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switch ((ddrclk_conf & 0x30) >> 4) {
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case QIXIS_DDRCLK_100:
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