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drivers: uart: Add support for UART_NS16550 TI K3 variant

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TI K3 family of SoCs requires an extended set of registers to operate.
Extended functionality of the current driver to support the variant.

Signed-off-by: L Lakshmanan <l-lakshmanan@ti.com>
This commit is contained in:
L Lakshmanan 2023-07-13 14:17:11 +05:30 • committed by Carles Cufí
commit 24759511f4
2 changed files with 32 additions and 0 deletions
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25
drivers/serial/uart_ns16550.c
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@ -68,6 +68,7 @@ BUILD_ASSERT(IS_ENABLED(CONFIG_PCIE), "NS16550(s) in DT need CONFIG_PCIE");
#define REG_MSR 0x06 /* Modem status reg. */
#define REG_DLF 0xC0 /* Divisor Latch Fraction */
#define REG_PCP 0x200 /* PRV_CLOCK_PARAMS (Apollo Lake) */
#define REG_MDR1 0x08 /* Mode control reg. (TI_K3) */
/* equates for interrupt enable register */
@ -99,6 +100,22 @@ BUILD_ASSERT(IS_ENABLED(CONFIG_PCIE), "NS16550(s) in DT need CONFIG_PCIE");
#define PCP_UPDATE 0x80000000 /* update clock */
#define PCP_EN 0x00000001 /* enable clock output */
/* Fields for TI K3 UART module */
#define MDR1_MODE_SELECT_FIELD_MASK BIT_MASK(3)
#define MDR1_MODE_SELECT_FIELD_SHIFT BIT_MASK(0)
/* Modes available for TI K3 UART module */
#define MDR1_STD_MODE (0)
#define MDR1_SIR_MODE (1)
#define MDR1_UART_16X (2)
#define MDR1_UART_13X (3)
#define MDR1_MIR_MODE (4)
#define MDR1_FIR_MODE (5)
#define MDR1_CIR_MODE (6)
#define MDR1_DISABLE (7)
/*
* Per PC16550D (Literature Number: SNLS378B):
*
@ -199,6 +216,7 @@ BUILD_ASSERT(IS_ENABLED(CONFIG_PCIE), "NS16550(s) in DT need CONFIG_PCIE");
#define MDC(dev) (get_port(dev) + REG_MDC * reg_interval(dev))
#define LSR(dev) (get_port(dev) + REG_LSR * reg_interval(dev))
#define MSR(dev) (get_port(dev) + REG_MSR * reg_interval(dev))
#define MDR1(dev) (get_port(dev) + REG_MDR1 * reg_interval(dev))
#define DLF(dev) (get_port(dev) + REG_DLF)
#define PCP(dev) (get_port(dev) + REG_PCP)
@ -421,6 +439,13 @@ static int uart_ns16550_configure(const struct device *dev,
}
#endif
#ifdef CONFIG_UART_NS16550_TI_K3
uint32_t mdr = ns16550_inbyte(dev_cfg, MDR1(dev));
mdr = ((mdr & ~MDR1_MODE_SELECT_FIELD_MASK) | ((((MDR1_STD_MODE) <<
MDR1_MODE_SELECT_FIELD_SHIFT)) & MDR1_MODE_SELECT_FIELD_MASK));
ns16550_outbyte(dev_cfg, MDR1(dev), mdr);
#endif
/*
* set clock frequency from clock_frequency property if valid,
* otherwise, get clock frequency from clock manager