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| author | Thierry Reding <treding@nvidia.com> | 2015-08-20 11:42:19 +0200 |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2015-09-16 16:10:22 -0700 |
| commit | c043c0259cd88f39cdca5f98af8b10f178660745 (patch) | |
| tree | 6def8ed72abc3fb8155956a6dff7f9c24fae3952 /arch/arm/mach-tegra | |
| parent | 70bcb43e7d943f5f437e84594e0b890b0869be23 (diff) | |
| download | talos-obmc-uboot-c043c0259cd88f39cdca5f98af8b10f178660745.tar.gz talos-obmc-uboot-c043c0259cd88f39cdca5f98af8b10f178660745.zip | |
ARM: tegra: Implement clk_m
On currently supported SoCs, clk_m always runs at the same frequency as
the oscillator input. However newer SoC generations such as Tegra210 no
longer have that restriction. Prepare for that by separating clk_m from
the oscillator clock and allow SoC code to override the clk_m rate.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra')
| -rw-r--r-- | arch/arm/mach-tegra/clock.c | 10 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/tegra210/clock.c | 11 |
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c index b85f63848f..f75c6c664a 100644 --- a/arch/arm/mach-tegra/clock.c +++ b/arch/arm/mach-tegra/clock.c @@ -461,6 +461,11 @@ void reset_cmplx_set_enable(int cpu, int which, int reset) writel(mask, &clkrst->crc_cpu_cmplx_clr); } +unsigned int __weak clk_m_get_rate(unsigned int parent_rate) +{ + return parent_rate; +} + unsigned clock_get_rate(enum clock_id clkid) { struct clk_pll *pll; @@ -472,6 +477,9 @@ unsigned clock_get_rate(enum clock_id clkid) if (clkid == CLOCK_ID_OSC) return parent_rate; + if (clkid == CLOCK_ID_CLK_M) + return clk_m_get_rate(parent_rate); + pll = get_pll(clkid); if (!pll) return 0; @@ -622,8 +630,10 @@ void clock_init(void) pll_rate[CLOCK_ID_XCPU] = clock_get_rate(CLOCK_ID_XCPU); pll_rate[CLOCK_ID_SFROM32KHZ] = 32768; pll_rate[CLOCK_ID_OSC] = clock_get_rate(CLOCK_ID_OSC); + pll_rate[CLOCK_ID_CLK_M] = clock_get_rate(CLOCK_ID_CLK_M); debug("Osc = %d\n", pll_rate[CLOCK_ID_OSC]); + debug("CLKM = %d\n", pll_rate[CLOCK_ID_CLK_M]); debug("PLLC = %d\n", pll_rate[CLOCK_ID_CGENERAL]); debug("PLLM = %d\n", pll_rate[CLOCK_ID_MEMORY]); debug("PLLP = %d\n", pll_rate[CLOCK_ID_PERIPH]); diff --git a/arch/arm/mach-tegra/tegra210/clock.c b/arch/arm/mach-tegra/tegra210/clock.c index 830a33ffc9..146bb6453a 100644 --- a/arch/arm/mach-tegra/tegra210/clock.c +++ b/arch/arm/mach-tegra/tegra210/clock.c @@ -998,6 +998,17 @@ void clock_early_init(void) udelay(2); } +unsigned int clk_m_get_rate(unsigned parent_rate) +{ + struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; + u32 value, div; + + value = readl(&clkrst->crc_spare_reg0); + div = ((value >> 2) & 0x3) + 1; + + return parent_rate / div; +} + void arch_timer_init(void) { struct sysctr_ctlr *sysctr = (struct sysctr_ctlr *)NV_PA_TSC_BASE; |
