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60a996bacb
STM32F4 serial IP is similar to F7 and H7, but registers are not located at the same offset and some feature are only supported by F7 and H7 version. Registers offset must be added for each version and also some flags indicated the supported feature. Update registers name to match with datasheet (sr to isr, rx_dr to rdr and tx_dr to tdr) and remove unused regs (cr2, gtpr, rtor, and rqr). Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
162 lines
4.0 KiB
C
162 lines
4.0 KiB
C
/*
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* (C) Copyright 2016
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* Vikas Manocha, <vikas.manocha@st.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 <clk.h>
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#include <dm.h>
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#include <asm/io.h>
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#include <serial.h>
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#include <asm/arch/stm32.h>
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#include "serial_stm32x7.h"
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DECLARE_GLOBAL_DATA_PTR;
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static int stm32_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
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bool stm32f4 = plat->uart_info->stm32f4;
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fdt_addr_t base = plat->base;
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u32 int_div, mantissa, fraction, oversampling;
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int_div = DIV_ROUND_CLOSEST(plat->clock_rate, baudrate);
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if (int_div < 16) {
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oversampling = 8;
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setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_OVER8);
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} else {
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oversampling = 16;
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clrbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_OVER8);
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}
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mantissa = (int_div / oversampling) << USART_BRR_M_SHIFT;
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fraction = int_div % oversampling;
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writel(mantissa | fraction, base + BRR_OFFSET(stm32f4));
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return 0;
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}
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static int stm32_serial_getc(struct udevice *dev)
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{
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struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
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bool stm32f4 = plat->uart_info->stm32f4;
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fdt_addr_t base = plat->base;
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if ((readl(base + ISR_OFFSET(stm32f4)) & USART_SR_FLAG_RXNE) == 0)
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return -EAGAIN;
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return readl(base + RDR_OFFSET(stm32f4));
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}
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static int stm32_serial_putc(struct udevice *dev, const char c)
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{
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struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
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bool stm32f4 = plat->uart_info->stm32f4;
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fdt_addr_t base = plat->base;
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if ((readl(base + ISR_OFFSET(stm32f4)) & USART_SR_FLAG_TXE) == 0)
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return -EAGAIN;
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writel(c, base + TDR_OFFSET(stm32f4));
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return 0;
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}
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static int stm32_serial_pending(struct udevice *dev, bool input)
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{
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struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
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bool stm32f4 = plat->uart_info->stm32f4;
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fdt_addr_t base = plat->base;
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if (input)
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return readl(base + ISR_OFFSET(stm32f4)) &
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USART_SR_FLAG_RXNE ? 1 : 0;
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else
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return readl(base + ISR_OFFSET(stm32f4)) &
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USART_SR_FLAG_TXE ? 0 : 1;
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}
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static int stm32_serial_probe(struct udevice *dev)
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{
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struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
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fdt_addr_t base = plat->base;
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bool stm32f4;
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u8 uart_enable_bit;
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plat->uart_info = (struct stm32_uart_info *)dev_get_driver_data(dev);
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stm32f4 = plat->uart_info->stm32f4;
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uart_enable_bit = plat->uart_info->uart_enable_bit;
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#ifdef CONFIG_CLK
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int ret;
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struct clk clk;
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret < 0)
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return ret;
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ret = clk_enable(&clk);
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if (ret) {
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dev_err(dev, "failed to enable clock\n");
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return ret;
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}
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#endif
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plat->clock_rate = clk_get_rate(&clk);
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if (plat->clock_rate < 0) {
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clk_disable(&clk);
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return plat->clock_rate;
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};
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/* Disable uart-> disable overrun-> enable uart */
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clrbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_RE | USART_CR1_TE |
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BIT(uart_enable_bit));
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if (plat->uart_info->has_overrun_disable)
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setbits_le32(base + CR3_OFFSET(stm32f4), USART_CR3_OVRDIS);
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setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_RE | USART_CR1_TE |
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BIT(uart_enable_bit));
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return 0;
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}
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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static const struct udevice_id stm32_serial_id[] = {
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{ .compatible = "st,stm32f7-uart", .data = (ulong)&stm32x7_info},
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{ .compatible = "st,stm32h7-uart", .data = (ulong)&stm32x7_info},
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{}
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};
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static int stm32_serial_ofdata_to_platdata(struct udevice *dev)
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{
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struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
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plat->base = devfdt_get_addr(dev);
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if (plat->base == FDT_ADDR_T_NONE)
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return -EINVAL;
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return 0;
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}
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#endif
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static const struct dm_serial_ops stm32_serial_ops = {
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.putc = stm32_serial_putc,
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.pending = stm32_serial_pending,
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.getc = stm32_serial_getc,
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.setbrg = stm32_serial_setbrg,
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};
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U_BOOT_DRIVER(serial_stm32) = {
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.name = "serial_stm32x7",
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.id = UCLASS_SERIAL,
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.of_match = of_match_ptr(stm32_serial_id),
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.ofdata_to_platdata = of_match_ptr(stm32_serial_ofdata_to_platdata),
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.platdata_auto_alloc_size = sizeof(struct stm32x7_serial_platdata),
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.ops = &stm32_serial_ops,
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.probe = stm32_serial_probe,
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.flags = DM_FLAG_PRE_RELOC,
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};
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