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https://github.com/brain-hackers/u-boot-brain
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c757a50bd1
The A23 only has UART0 muxed with MMC0. Some of the boards we encountered expose R_UART as a set of pads. Add support for R_UART so we can have a console while using mmc. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Ian Campbell <ijc@hellion.org.uk>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/*
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* sun6i specific clock code
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*
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* (C) Copyright 2007-2012
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*
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* (C) Copyright 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/prcm.h>
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#include <asm/arch/sys_proto.h>
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void clock_init_uart(void)
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{
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struct sunxi_ccm_reg *const ccm =
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(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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#if CONFIG_CONS_INDEX < 5
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/* uart clock source is apb2 */
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writel(APB2_CLK_SRC_OSC24M|
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APB2_CLK_RATE_N_1|
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APB2_CLK_RATE_M(1),
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&ccm->apb2_div);
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/* open the clock for uart */
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setbits_le32(&ccm->apb2_gate,
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CLK_GATE_OPEN << (APB2_GATE_UART_SHIFT +
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CONFIG_CONS_INDEX - 1));
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/* deassert uart reset */
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setbits_le32(&ccm->apb2_reset_cfg,
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1 << (APB2_RESET_UART_SHIFT +
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CONFIG_CONS_INDEX - 1));
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#else
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/* enable R_PIO and R_UART clocks, and de-assert resets */
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prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_UART);
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#endif
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/* Dup with clock_init_safe(), drop once sun6i SPL support lands */
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writel(PLL6_CFG_DEFAULT, &ccm->pll6_cfg);
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}
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int clock_twi_onoff(int port, int state)
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{
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struct sunxi_ccm_reg *const ccm =
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(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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if (port > 3)
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return -1;
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/* set the apb clock gate for twi */
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if (state)
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setbits_le32(&ccm->apb2_gate,
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CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
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else
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clrbits_le32(&ccm->apb2_gate,
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CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
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return 0;
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}
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unsigned int clock_get_pll6(void)
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{
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struct sunxi_ccm_reg *const ccm =
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(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
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uint32_t rval = readl(&ccm->pll6_cfg);
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int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT) + 1;
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int k = ((rval & CCM_PLL6_CTRL_K_MASK) >> CCM_PLL6_CTRL_K_SHIFT) + 1;
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return 24000000 * n * k / 2;
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}
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