From b8e1313f0d9c53ee0d53a03bfa178a23ae262644 Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Fri, 12 Apr 2013 12:28:19 +0200 Subject: tegra: add driver for the clock and reset module Only a basic set of clocks is supported. This is a temporary solution and will go away as soon as the port of the Tegra common clock code from the Linux kernel is ready to go. Signed-off-by: Lucas Stach Tested-by: Antony Pavlov Signed-off-by: Sascha Hauer --- arch/arm/Kconfig | 2 + arch/arm/dts/tegra20.dtsi | 6 ++ arch/arm/mach-tegra/Makefile | 1 + arch/arm/mach-tegra/include/mach/clkdev.h | 7 ++ arch/arm/mach-tegra/include/mach/tegra20-car.h | 22 +++++ arch/arm/mach-tegra/tegra20-car.c | 116 +++++++++++++++++++++++++ 6 files changed, 154 insertions(+) create mode 100644 arch/arm/mach-tegra/include/mach/clkdev.h create mode 100644 arch/arm/mach-tegra/include/mach/tegra20-car.h create mode 100644 arch/arm/mach-tegra/tegra20-car.c diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fdd803e2fb..ed34d2caf2 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -140,6 +140,8 @@ config ARCH_TEGRA select CPU_V7 select HAS_DEBUG_LL select BUILTIN_DTB + select COMMON_CLK + select CLKDEV_LOOKUP select OFDEVICE select OFTREE diff --git a/arch/arm/dts/tegra20.dtsi b/arch/arm/dts/tegra20.dtsi index 9f8860bd53..2edfda1916 100644 --- a/arch/arm/dts/tegra20.dtsi +++ b/arch/arm/dts/tegra20.dtsi @@ -2,4 +2,10 @@ / { compatible = "nvidia,tegra20"; + + tegra_car: clock { + compatible = "nvidia,tegra20-car"; + reg = <0x60006000 0x1000>; + #clock-cells = <1>; + }; }; diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile index 11915e5e23..9aa7725f28 100644 --- a/arch/arm/mach-tegra/Makefile +++ b/arch/arm/mach-tegra/Makefile @@ -1,2 +1,3 @@ obj-y += clock.o obj-y += reset.o +obj-y += tegra20-car.o diff --git a/arch/arm/mach-tegra/include/mach/clkdev.h b/arch/arm/mach-tegra/include/mach/clkdev.h new file mode 100644 index 0000000000..04b37a8980 --- /dev/null +++ b/arch/arm/mach-tegra/include/mach/clkdev.h @@ -0,0 +1,7 @@ +#ifndef __ASM_MACH_CLKDEV_H +#define __ASM_MACH_CLKDEV_H + +#define __clk_get(clk) ({ 1; }) +#define __clk_put(clk) do { } while (0) + +#endif diff --git a/arch/arm/mach-tegra/include/mach/tegra20-car.h b/arch/arm/mach-tegra/include/mach/tegra20-car.h new file mode 100644 index 0000000000..43ed059e37 --- /dev/null +++ b/arch/arm/mach-tegra/include/mach/tegra20-car.h @@ -0,0 +1,22 @@ +/* + * Copyright (C) 2013 Lucas Stach + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +/* Register definitions */ +#define CRC_OSC_CTRL 0x050 +#define CRC_OSC_CTRL_OSC_FREQ_SHIFT 30 +#define CRC_OSC_CTRL_OSC_FREQ_MASK (0x3 << CRC_OSC_CTRL_OSC_FREQ_SHIFT) +#define CRC_OSC_CTRL_PLL_REF_DIV_SHIFT 28 +#define CRC_OSC_CTRL_PLL_REF_DIV_MASK (0x3 << CRC_OSC_CTRL_PLL_REF_DIV_SHIFT) diff --git a/arch/arm/mach-tegra/tegra20-car.c b/arch/arm/mach-tegra/tegra20-car.c new file mode 100644 index 0000000000..93616bf98e --- /dev/null +++ b/arch/arm/mach-tegra/tegra20-car.c @@ -0,0 +1,116 @@ +/* + * Copyright (C) 2013 Lucas Stach + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +/** + * @file + * @brief Device driver for the Tegra 20 clock and reset (CAR) controller + */ + +#include +#include +#include +#include +#include +#include + +#include + +static void __iomem *car_base; + +enum tegra20_clks { + cpu, ac97 = 3, rtc, timer, uarta, gpio = 8, sdmmc2, i2s1 = 11, i2c1, + ndflash, sdmmc1, sdmmc4, twc, pwm, i2s2, epp, gr2d = 21, usbd, isp, + gr3d, ide, disp2, disp1, host1x, vcp, cache2 = 31, mem, ahbdma, apbdma, + kbc = 36, stat_mon, pmc, fuse, kfuse, sbc1, nor, spi, sbc2, xio, sbc3, + dvc, dsi, mipi = 50, hdmi, csi, tvdac, i2c2, uartc, emc = 57, usb2, + usb3, mpe, vde, bsea, bsev, speedo, uartd, uarte, i2c3, sbc4, sdmmc3, + pex, owr, afi, csite, pcie_xclk, avpucq = 75, la, irama = 84, iramb, + iramc, iramd, cram2, audio_2x, clk_d, csus = 92, cdev1, cdev2, + uartb = 96, vfir, spdif_in, spdif_out, vi, vi_sensor, tvo, cve, + osc, clk_32k, clk_m, sclk, cclk, hclk, pclk, blink, pll_a, pll_a_out0, + pll_c, pll_c_out1, pll_d, pll_d_out0, pll_e, pll_m, pll_m_out1, + pll_p, pll_p_out1, pll_p_out2, pll_p_out3, pll_p_out4, pll_u, + pll_x, audio, pll_ref, twd, clk_max, +}; + +static struct clk *clks[clk_max]; + +static unsigned long get_osc_frequency(void) +{ + u32 osc_ctrl = readl(car_base + CRC_OSC_CTRL); + + switch ((osc_ctrl & CRC_OSC_CTRL_OSC_FREQ_MASK) >> + CRC_OSC_CTRL_OSC_FREQ_SHIFT) { + case 0: + return 13000000; + case 1: + return 19200000; + case 2: + return 12000000; + case 3: + return 26000000; + default: + return 0; + } +} + +static unsigned int get_pll_ref_div(void) +{ + u32 osc_ctrl = readl(car_base + CRC_OSC_CTRL); + + return 1U << ((osc_ctrl & CRC_OSC_CTRL_PLL_REF_DIV_MASK) >> + CRC_OSC_CTRL_PLL_REF_DIV_SHIFT); +} + +static int tegra20_car_probe(struct device_d *dev) +{ + car_base = dev_request_mem_region(dev, 0); + if (!car_base) + return -EBUSY; + + /* primary clocks */ + clks[clk_m] = clk_fixed("clk_m", get_osc_frequency()); + clks[clk_32k] = clk_fixed("clk_32k", 32768); + + clks[pll_ref] = clk_fixed_factor("pll_ref", "clk_m", 1, + get_pll_ref_div()); + + /* derived clocks */ + /* timer is a gate, but as it's enabled by BOOTROM we needn't worry */ + clks[timer] = clk_fixed_factor("timer", "clk_m", 1, 1); + + return 0; +} + +static __maybe_unused struct of_device_id tegra20_car_dt_ids[] = { + { + .compatible = "nvidia,tegra20-car", + }, { + /* sentinel */ + } +}; + +static struct driver_d tegra20_car_driver = { + .probe = tegra20_car_probe, + .name = "tegra20-car", + .of_compatible = DRV_OF_COMPAT(tegra20_car_dt_ids), +}; + +static int tegra20_car_init(void) +{ + return platform_driver_register(&tegra20_car_driver); +} +postcore_initcall(tegra20_car_init); -- cgit v1.2.3