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author | Thierry Reding <treding@nvidia.com> | 2014-12-09 22:25:06 -0700 |
---|---|---|
committer | Tom Warren <twarren@nvidia.com> | 2014-12-18 13:19:20 -0700 |
commit | a7230745504552095594362b81caaa33b5d7da5e (patch) | |
tree | 7612f4b9d43c4adcce47d32113d6a540be41cf6a /arch/arm/cpu/tegra20-common | |
parent | 6173c45b21ca584fd691b21dc81a44d852d4bdce (diff) | |
download | u-boot-imx-a7230745504552095594362b81caaa33b5d7da5e.zip u-boot-imx-a7230745504552095594362b81caaa33b5d7da5e.tar.gz u-boot-imx-a7230745504552095594362b81caaa33b5d7da5e.tar.bz2 |
ARM: tegra: Implement tegra_plle_enable()
This function is required by PCIe and SATA. This patch implements it on
Tegra20, Tegra30 and Tegra124. It isn't implemented for Tegra114 because
it doesn't support PCIe or SATA.
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/cpu/tegra20-common')
-rw-r--r-- | arch/arm/cpu/tegra20-common/clock.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/arch/arm/cpu/tegra20-common/clock.c b/arch/arm/cpu/tegra20-common/clock.c index 0c4f5fb..d55fbc8 100644 --- a/arch/arm/cpu/tegra20-common/clock.c +++ b/arch/arm/cpu/tegra20-common/clock.c @@ -7,6 +7,7 @@ /* Tegra20 Clock control functions */ #include <common.h> +#include <errno.h> #include <asm/io.h> #include <asm/arch/clock.h> #include <asm/arch/tegra.h> @@ -548,3 +549,139 @@ void clock_early_init(void) void arch_timer_init(void) { } + +#define PMC_SATA_PWRGT 0x1ac +#define PMC_SATA_PWRGT_PLLE_IDDQ_OVERRIDE (1 << 5) +#define PMC_SATA_PWRGT_PLLE_IDDQ_SWCTL (1 << 4) + +#define PLLE_SS_CNTL 0x68 +#define PLLE_SS_CNTL_SSCINCINTRV(x) (((x) & 0x3f) << 24) +#define PLLE_SS_CNTL_SSCINC(x) (((x) & 0xff) << 16) +#define PLLE_SS_CNTL_SSCBYP (1 << 12) +#define PLLE_SS_CNTL_INTERP_RESET (1 << 11) +#define PLLE_SS_CNTL_BYPASS_SS (1 << 10) +#define PLLE_SS_CNTL_SSCMAX(x) (((x) & 0x1ff) << 0) + +#define PLLE_BASE 0x0e8 +#define PLLE_BASE_ENABLE_CML (1 << 31) +#define PLLE_BASE_ENABLE (1 << 30) +#define PLLE_BASE_PLDIV_CML(x) (((x) & 0xf) << 24) +#define PLLE_BASE_PLDIV(x) (((x) & 0x3f) << 16) +#define PLLE_BASE_NDIV(x) (((x) & 0xff) << 8) +#define PLLE_BASE_MDIV(x) (((x) & 0xff) << 0) + +#define PLLE_MISC 0x0ec +#define PLLE_MISC_SETUP_BASE(x) (((x) & 0xffff) << 16) +#define PLLE_MISC_PLL_READY (1 << 15) +#define PLLE_MISC_LOCK (1 << 11) +#define PLLE_MISC_LOCK_ENABLE (1 << 9) +#define PLLE_MISC_SETUP_EXT(x) (((x) & 0x3) << 2) + +static int tegra_plle_train(void) +{ + unsigned int timeout = 2000; + unsigned long value; + + value = readl(NV_PA_PMC_BASE + PMC_SATA_PWRGT); + value |= PMC_SATA_PWRGT_PLLE_IDDQ_OVERRIDE; + writel(value, NV_PA_PMC_BASE + PMC_SATA_PWRGT); + + value = readl(NV_PA_PMC_BASE + PMC_SATA_PWRGT); + value |= PMC_SATA_PWRGT_PLLE_IDDQ_SWCTL; + writel(value, NV_PA_PMC_BASE + PMC_SATA_PWRGT); + + value = readl(NV_PA_PMC_BASE + PMC_SATA_PWRGT); + value &= ~PMC_SATA_PWRGT_PLLE_IDDQ_OVERRIDE; + writel(value, NV_PA_PMC_BASE + PMC_SATA_PWRGT); + + do { + value = readl(NV_PA_CLK_RST_BASE + PLLE_MISC); + if (value & PLLE_MISC_PLL_READY) + break; + + udelay(100); + } while (--timeout); + + if (timeout == 0) { + error("timeout waiting for PLLE to become ready"); + return -ETIMEDOUT; + } + + return 0; +} + +int tegra_plle_enable(void) +{ + unsigned int timeout = 1000; + u32 value; + int err; + + /* disable PLLE clock */ + value = readl(NV_PA_CLK_RST_BASE + PLLE_BASE); + value &= ~PLLE_BASE_ENABLE_CML; + value &= ~PLLE_BASE_ENABLE; + writel(value, NV_PA_CLK_RST_BASE + PLLE_BASE); + + /* clear lock enable and setup field */ + value = readl(NV_PA_CLK_RST_BASE + PLLE_MISC); + value &= ~PLLE_MISC_LOCK_ENABLE; + value &= ~PLLE_MISC_SETUP_BASE(0xffff); + value &= ~PLLE_MISC_SETUP_EXT(0x3); + writel(value, NV_PA_CLK_RST_BASE + PLLE_MISC); + + value = readl(NV_PA_CLK_RST_BASE + PLLE_MISC); + if ((value & PLLE_MISC_PLL_READY) == 0) { + err = tegra_plle_train(); + if (err < 0) { + error("failed to train PLLE: %d", err); + return err; + } + } + + value = readl(NV_PA_CLK_RST_BASE + PLLE_MISC); + value |= PLLE_MISC_SETUP_BASE(0x7); + value |= PLLE_MISC_LOCK_ENABLE; + value |= PLLE_MISC_SETUP_EXT(0); + writel(value, NV_PA_CLK_RST_BASE + PLLE_MISC); + + value = readl(NV_PA_CLK_RST_BASE + PLLE_SS_CNTL); + value |= PLLE_SS_CNTL_SSCBYP | PLLE_SS_CNTL_INTERP_RESET | + PLLE_SS_CNTL_BYPASS_SS; + writel(value, NV_PA_CLK_RST_BASE + PLLE_SS_CNTL); + + value = readl(NV_PA_CLK_RST_BASE + PLLE_BASE); + value |= PLLE_BASE_ENABLE_CML | PLLE_BASE_ENABLE; + writel(value, NV_PA_CLK_RST_BASE + PLLE_BASE); + + do { + value = readl(NV_PA_CLK_RST_BASE + PLLE_MISC); + if (value & PLLE_MISC_LOCK) + break; + + udelay(2); + } while (--timeout); + + if (timeout == 0) { + error("timeout waiting for PLLE to lock"); + return -ETIMEDOUT; + } + + udelay(50); + + value = readl(NV_PA_CLK_RST_BASE + PLLE_SS_CNTL); + value &= ~PLLE_SS_CNTL_SSCINCINTRV(0x3f); + value |= PLLE_SS_CNTL_SSCINCINTRV(0x18); + + value &= ~PLLE_SS_CNTL_SSCINC(0xff); + value |= PLLE_SS_CNTL_SSCINC(0x01); + + value &= ~PLLE_SS_CNTL_SSCBYP; + value &= ~PLLE_SS_CNTL_INTERP_RESET; + value &= ~PLLE_SS_CNTL_BYPASS_SS; + + value &= ~PLLE_SS_CNTL_SSCMAX(0x1ff); + value |= PLLE_SS_CNTL_SSCMAX(0x24); + writel(value, NV_PA_CLK_RST_BASE + PLLE_SS_CNTL); + + return 0; +} |