diff options
Diffstat (limited to 'plat/sun50iw1p1/sunxi_clocks.c')
-rw-r--r-- | plat/sun50iw1p1/sunxi_clocks.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/plat/sun50iw1p1/sunxi_clocks.c b/plat/sun50iw1p1/sunxi_clocks.c new file mode 100644 index 0000000..9a0b174 --- /dev/null +++ b/plat/sun50iw1p1/sunxi_clocks.c @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <debug.h> +#include <mmio.h> +#include <ccmu.h> +#include "sunxi_private.h" + +int sunxi_setup_clocks(void) +{ + uint32_t reg; + + /* Avoid reprogramming PERIPH0 if not necessary */ + reg = mmio_read_32(CCMU_PLL_PERIPH0_CTRL_REG); + if ((reg & 0x0fffffff) != 0x41811) /* is not at 600 MHz? */ + mmio_write_32(CCMU_PLL_PERIPH0_CTRL_REG, 0x80041811); + + /* Check initial CPU frequency: */ + reg = mmio_read_32(CCMU_PLL_CPUX_CTRL_REG); + if ((reg & 0x0fffffff) != 0x1010) { /* if not at 816 MHz: */ + /* switch CPU to 24 MHz source for changing PLL1 */ + mmio_write_32(CCMU_CPUX_AXI_CFG_REG, 0x00010000); + udelay(1); + + /* Set to 816 MHz */ + mmio_write_32(CCMU_PLL_CPUX_CTRL_REG, 0x80001010); + udelay(1); + } + + /* switch CPU to PLL1 source, AXI = CPU/3, APB = CPU/4 */ + mmio_write_32(CCMU_CPUX_AXI_CFG_REG, 0x00020302); + udelay(1); + + /* AHB1 = PERIPH0 / (3 * 1) = 200MHz, APB1 = AHB1 / 2 */ + mmio_write_32(CCMU_AHB1_APB1_CFG_REG, 0x00003180); + mmio_write_32(CCMU_APB2_CFG_GREG, 0x01000000); /* APB2 => 24 MHz */ + mmio_write_32(CCMU_AHB2_CFG_GREG, 0x00000001); /* AHB2 => 300 MHz */ + + return 0; +} |