mirror of
https://github.com/AsahiLinux/u-boot
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dacc0881ac
Add initial sun9i (A80) clock setup support, enough to get the uart + mmc going. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/*
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* sun9i specific clock code
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*
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* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
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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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/* open the clock for uart */
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setbits_le32(&ccm->apb1_gate,
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CLK_GATE_OPEN << (APB1_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->apb1_reset_cfg,
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1 << (APB1_RESET_UART_SHIFT +
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CONFIG_CONS_INDEX - 1));
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/* Dup with clock_init_safe(), drop once sun9i SPL support lands */
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writel(PLL4_CFG_DEFAULT, &ccm->pll4_periph0_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 > 4)
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return -1;
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/* set the apb reset and clock gate for twi */
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if (state) {
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setbits_le32(&ccm->apb1_gate,
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CLK_GATE_OPEN << (APB1_GATE_TWI_SHIFT + port));
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setbits_le32(&ccm->apb1_reset_cfg,
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1 << (APB1_RESET_UART_SHIFT + port));
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} else {
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clrbits_le32(&ccm->apb1_reset_cfg,
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1 << (APB1_RESET_UART_SHIFT + port));
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clrbits_le32(&ccm->apb1_gate,
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CLK_GATE_OPEN << (APB1_GATE_TWI_SHIFT + port));
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}
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return 0;
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}
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unsigned int clock_get_pll4_periph0(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->pll4_periph0_cfg);
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int n = ((rval & CCM_PLL4_CTRL_N_MASK) >> CCM_PLL4_CTRL_N_SHIFT);
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int p = ((rval & CCM_PLL4_CTRL_P_MASK) >> CCM_PLL4_CTRL_P_SHIFT);
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int m = ((rval & CCM_PLL4_CTRL_M_MASK) >> CCM_PLL4_CTRL_M_SHIFT) + 1;
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const int k = 1;
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return ((24000000 * n * k) >> p) / m;
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}
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