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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __MACH_IMX7_CCM_REGS_H__
#define __MACH_IMX7_CCM_REGS_H__
#include <io.h>
#include <linux/build_bug.h>
#define IMX7_CLOCK_ROOT_INDEX(x) (((x) - 0x8000) / 128)
/*
* Taken from "Table 5-11. Clock Root Table" from i.MX7 Dual Processor
* Reference Manual
*/
/* 1 <= n <= 6 */
#define IMX7_CCM_CCGR_UART(n) (148 + (n) - 1)
#define IMX7_UART_CLK_ROOT(n) IMX7_CLOCK_ROOT_INDEX(0xaf80 + (n - 1) * 0x80)
#define IMX7_UART_CLK_ROOT__OSC_24M IMX7_CCM_TARGET_ROOTn_MUX(0b000)
/* 0 <= n <= 190 */
#define IMX7_CCM_CCGRn_SET(n) (0x4004 + 16 * (n))
#define IMX7_CCM_CCGRn_CLR(n) (0x4008 + 16 * (n))
/* 0 <= n <= 120 */
#define IMX7_CCM_TARGET_ROOTn(n) (0x8000 + 128 * (n))
#define IMX7_CCM_TARGET_ROOTn_MUX(x) ((x) << 24)
#define IMX7_CCM_TARGET_ROOTn_ENABLE BIT(28)
#define IMX7_CCM_CCGR_SETTINGn(n, s) ((s) << ((n) * 4))
#define IMX7_CCM_CCGR_SETTINGn_NOT_NEEDED(n) IMX7_CCM_CCGR_SETTINGn(n, 0b00)
#define IMX7_CCM_CCGR_SETTINGn_NEEDED_RUN(n) IMX7_CCM_CCGR_SETTINGn(n, 0b01)
#define IMX7_CCM_CCGR_SETTINGn_NEEDED_RUN_WAIT(n) IMX7_CCM_CCGR_SETTINGn(n, 0b10)
#define IMX7_CCM_CCGR_SETTINGn_NEEDED(n) IMX7_CCM_CCGR_SETTINGn(n, 0b11)
/* UART counting starts for 1, like in the datasheet/dt-bindings */
static inline void __imx7_early_setup_uart_clock(int uart)
{
void __iomem *ccm = IOMEM(MX7_CCM_BASE_ADDR);
writel(IMX7_CCM_CCGR_SETTINGn_NEEDED(0),
ccm + IMX7_CCM_CCGRn_CLR(IMX7_CCM_CCGR_UART(uart)));
writel(IMX7_CCM_TARGET_ROOTn_ENABLE | IMX7_UART_CLK_ROOT__OSC_24M,
ccm + IMX7_CCM_TARGET_ROOTn(IMX7_UART_CLK_ROOT(uart)));
writel(IMX7_CCM_CCGR_SETTINGn_NEEDED(0),
ccm + IMX7_CCM_CCGRn_SET(IMX7_CCM_CCGR_UART(uart)));
}
#define imx7_early_setup_uart_clock(uart) do { \
static_assert(1 <= (uart) && (uart) <= 6, "ID out of UART1-6 range"); \
__imx7_early_setup_uart_clock(uart); \
} while (0)
#endif
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