diff options
Diffstat (limited to 'arch/mips/cavium-octeon')
| -rw-r--r-- | arch/mips/cavium-octeon/csrc-octeon.c | 93 | ||||
| -rw-r--r-- | arch/mips/cavium-octeon/setup.c | 3 |
2 files changed, 65 insertions, 31 deletions
diff --git a/arch/mips/cavium-octeon/csrc-octeon.c b/arch/mips/cavium-octeon/csrc-octeon.c index ce6483a9302..02193953eb9 100644 --- a/arch/mips/cavium-octeon/csrc-octeon.c +++ b/arch/mips/cavium-octeon/csrc-octeon.c @@ -4,7 +4,7 @@ * for more details. * * Copyright (C) 2007 by Ralf Baechle - * Copyright (C) 2009, 2010 Cavium Networks, Inc. + * Copyright (C) 2009, 2012 Cavium, Inc. */ #include <linux/clocksource.h> #include <linux/export.h> @@ -18,6 +18,33 @@ #include <asm/octeon/cvmx-ipd-defs.h> #include <asm/octeon/cvmx-mio-defs.h> + +static u64 f; +static u64 rdiv; +static u64 sdiv; +static u64 octeon_udelay_factor; +static u64 octeon_ndelay_factor; + +void __init octeon_setup_delays(void) +{ + octeon_udelay_factor = octeon_get_clock_rate() / 1000000; + /* + * For __ndelay we divide by 2^16, so the factor is multiplied + * by the same amount. + */ + octeon_ndelay_factor = (octeon_udelay_factor * 0x10000ull) / 1000ull; + + preset_lpj = octeon_get_clock_rate() / HZ; + + if (current_cpu_type() == CPU_CAVIUM_OCTEON2) { + union cvmx_mio_rst_boot rst_boot; + rst_boot.u64 = cvmx_read_csr(CVMX_MIO_RST_BOOT); + rdiv = rst_boot.s.c_mul; /* CPU clock */ + sdiv = rst_boot.s.pnr_mul; /* I/O clock */ + f = (0x8000000000000000ull / sdiv) * 2; + } +} + /* * Set the current core's cvmcount counter to the value of the * IPD_CLK_COUNT. We do this on all cores as they are brought @@ -30,17 +57,6 @@ void octeon_init_cvmcount(void) { unsigned long flags; unsigned loops = 2; - u64 f = 0; - u64 rdiv = 0; - u64 sdiv = 0; - if (current_cpu_type() == CPU_CAVIUM_OCTEON2) { - union cvmx_mio_rst_boot rst_boot; - rst_boot.u64 = cvmx_read_csr(CVMX_MIO_RST_BOOT); - rdiv = rst_boot.s.c_mul; /* CPU clock */ - sdiv = rst_boot.s.pnr_mul; /* I/O clock */ - f = (0x8000000000000000ull / sdiv) * 2; - } - /* Clobber loops so GCC will not unroll the following while loop. */ asm("" : "+r" (loops)); @@ -57,9 +73,9 @@ void octeon_init_cvmcount(void) if (f != 0) { asm("dmultu\t%[cnt],%[f]\n\t" "mfhi\t%[cnt]" - : [cnt] "+r" (ipd_clk_count), - [f] "=r" (f) - : : "hi", "lo"); + : [cnt] "+r" (ipd_clk_count) + : [f] "r" (f) + : "hi", "lo"); } } write_c0_cvmcount(ipd_clk_count); @@ -109,21 +125,6 @@ void __init plat_time_init(void) clocksource_register_hz(&clocksource_mips, octeon_get_clock_rate()); } -static u64 octeon_udelay_factor; -static u64 octeon_ndelay_factor; - -void __init octeon_setup_delays(void) -{ - octeon_udelay_factor = octeon_get_clock_rate() / 1000000; - /* - * For __ndelay we divide by 2^16, so the factor is multiplied - * by the same amount. - */ - octeon_ndelay_factor = (octeon_udelay_factor * 0x10000ull) / 1000ull; - - preset_lpj = octeon_get_clock_rate() / HZ; -} - void __udelay(unsigned long us) { u64 cur, end, inc; @@ -163,3 +164,35 @@ void __delay(unsigned long loops) cur = read_c0_cvmcount(); } EXPORT_SYMBOL(__delay); + + +/** + * octeon_io_clk_delay - wait for a given number of io clock cycles to pass. + * + * We scale the wait by the clock ratio, and then wait for the + * corresponding number of core clocks. + * + * @count: The number of clocks to wait. + */ +void octeon_io_clk_delay(unsigned long count) +{ + u64 cur, end; + + cur = read_c0_cvmcount(); + if (rdiv != 0) { + end = count * rdiv; + if (f != 0) { + asm("dmultu\t%[cnt],%[f]\n\t" + "mfhi\t%[cnt]" + : [cnt] "+r" (end) + : [f] "r" (f) + : "hi", "lo"); + } + end = cur + end; + } else { + end = cur + count; + } + while (end > cur) + cur = read_c0_cvmcount(); +} +EXPORT_SYMBOL(octeon_io_clk_delay); diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c index 919b0fb7bb1..04dd8ff0e0d 100644 --- a/arch/mips/cavium-octeon/setup.c +++ b/arch/mips/cavium-octeon/setup.c @@ -548,6 +548,8 @@ void __init prom_init(void) } #endif + octeon_setup_delays(); + /* * BIST should always be enabled when doing a soft reset. L2 * Cache locking for instance is not cleared unless BIST is @@ -611,7 +613,6 @@ void __init prom_init(void) mips_hpt_frequency = octeon_get_clock_rate(); octeon_init_cvmcount(); - octeon_setup_delays(); _machine_restart = octeon_restart; _machine_halt = octeon_halt; |