1*83d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+ 2cc35fdbcSVladimir Zapolskiy /* 3f21069edSVladimir Zapolskiy * Copyright (C) 2011-2015 Vladimir Zapolskiy <vz@mleia.com> 4cc35fdbcSVladimir Zapolskiy */ 5cc35fdbcSVladimir Zapolskiy 6cc35fdbcSVladimir Zapolskiy #include <common.h> 7f21069edSVladimir Zapolskiy #include <dm.h> 8e503f90aSMarek Vasut #include <serial.h> 9f21069edSVladimir Zapolskiy #include <dm/platform_data/lpc32xx_hsuart.h> 10f21069edSVladimir Zapolskiy 11f21069edSVladimir Zapolskiy #include <asm/arch/uart.h> 12e503f90aSMarek Vasut #include <linux/compiler.h> 13cc35fdbcSVladimir Zapolskiy 14f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv { 15f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart; 16f21069edSVladimir Zapolskiy }; 17cc35fdbcSVladimir Zapolskiy 18f21069edSVladimir Zapolskiy static int lpc32xx_serial_setbrg(struct udevice *dev, int baudrate) 19cc35fdbcSVladimir Zapolskiy { 20f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev); 21f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart; 22cc35fdbcSVladimir Zapolskiy u32 div; 23cc35fdbcSVladimir Zapolskiy 24cc35fdbcSVladimir Zapolskiy /* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */ 25f21069edSVladimir Zapolskiy div = (get_serial_clock() / 14 + baudrate / 2) / baudrate - 1; 26cc35fdbcSVladimir Zapolskiy if (div > 255) 27cc35fdbcSVladimir Zapolskiy div = 255; 28cc35fdbcSVladimir Zapolskiy 29cc35fdbcSVladimir Zapolskiy writel(div, &hsuart->rate); 30f21069edSVladimir Zapolskiy 31f21069edSVladimir Zapolskiy return 0; 32cc35fdbcSVladimir Zapolskiy } 33cc35fdbcSVladimir Zapolskiy 34f21069edSVladimir Zapolskiy static int lpc32xx_serial_getc(struct udevice *dev) 35cc35fdbcSVladimir Zapolskiy { 36f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev); 37f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart; 38f21069edSVladimir Zapolskiy 39f21069edSVladimir Zapolskiy if (!(readl(&hsuart->level) & HSUART_LEVEL_RX)) 40f21069edSVladimir Zapolskiy return -EAGAIN; 41cc35fdbcSVladimir Zapolskiy 42cc35fdbcSVladimir Zapolskiy return readl(&hsuart->rx) & HSUART_RX_DATA; 43cc35fdbcSVladimir Zapolskiy } 44cc35fdbcSVladimir Zapolskiy 45f21069edSVladimir Zapolskiy static int lpc32xx_serial_putc(struct udevice *dev, const char c) 46cc35fdbcSVladimir Zapolskiy { 47f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev); 48f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart; 49f21069edSVladimir Zapolskiy 50f21069edSVladimir Zapolskiy /* Wait for empty FIFO */ 51f21069edSVladimir Zapolskiy if (readl(&hsuart->level) & HSUART_LEVEL_TX) 52f21069edSVladimir Zapolskiy return -EAGAIN; 535deccafaSVladimir Zapolskiy 54cc35fdbcSVladimir Zapolskiy writel(c, &hsuart->tx); 55cc35fdbcSVladimir Zapolskiy 56cc35fdbcSVladimir Zapolskiy return 0; 57cc35fdbcSVladimir Zapolskiy } 58cc35fdbcSVladimir Zapolskiy 59f21069edSVladimir Zapolskiy static int lpc32xx_serial_pending(struct udevice *dev, bool input) 60cc35fdbcSVladimir Zapolskiy { 61f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev); 62f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart; 63cc35fdbcSVladimir Zapolskiy 64f21069edSVladimir Zapolskiy if (input) { 65f21069edSVladimir Zapolskiy if (readl(&hsuart->level) & HSUART_LEVEL_RX) 66f21069edSVladimir Zapolskiy return 1; 67f21069edSVladimir Zapolskiy } else { 68f21069edSVladimir Zapolskiy if (readl(&hsuart->level) & HSUART_LEVEL_TX) 69f21069edSVladimir Zapolskiy return 1; 70f21069edSVladimir Zapolskiy } 71f21069edSVladimir Zapolskiy 72f21069edSVladimir Zapolskiy return 0; 73f21069edSVladimir Zapolskiy } 74f21069edSVladimir Zapolskiy 75f21069edSVladimir Zapolskiy static int lpc32xx_serial_init(struct hsuart_regs *hsuart) 76f21069edSVladimir Zapolskiy { 77cc35fdbcSVladimir Zapolskiy /* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */ 78cc35fdbcSVladimir Zapolskiy writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) | 79cc35fdbcSVladimir Zapolskiy HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0, 80cc35fdbcSVladimir Zapolskiy &hsuart->ctrl); 81f21069edSVladimir Zapolskiy 82e503f90aSMarek Vasut return 0; 83cc35fdbcSVladimir Zapolskiy } 84cc35fdbcSVladimir Zapolskiy 85f21069edSVladimir Zapolskiy static int lpc32xx_hsuart_probe(struct udevice *dev) 86f21069edSVladimir Zapolskiy { 87f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_platdata *platdata = dev_get_platdata(dev); 88f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev); 89f21069edSVladimir Zapolskiy 90f21069edSVladimir Zapolskiy priv->hsuart = (struct hsuart_regs *)platdata->base; 91f21069edSVladimir Zapolskiy 92f21069edSVladimir Zapolskiy lpc32xx_serial_init(priv->hsuart); 93f21069edSVladimir Zapolskiy 94f21069edSVladimir Zapolskiy return 0; 95f21069edSVladimir Zapolskiy } 96f21069edSVladimir Zapolskiy 97f21069edSVladimir Zapolskiy static const struct dm_serial_ops lpc32xx_hsuart_ops = { 98e503f90aSMarek Vasut .setbrg = lpc32xx_serial_setbrg, 99e503f90aSMarek Vasut .getc = lpc32xx_serial_getc, 100f21069edSVladimir Zapolskiy .putc = lpc32xx_serial_putc, 101f21069edSVladimir Zapolskiy .pending = lpc32xx_serial_pending, 102e503f90aSMarek Vasut }; 103e503f90aSMarek Vasut 104f21069edSVladimir Zapolskiy U_BOOT_DRIVER(lpc32xx_hsuart) = { 105f21069edSVladimir Zapolskiy .name = "lpc32xx_hsuart", 106f21069edSVladimir Zapolskiy .id = UCLASS_SERIAL, 107f21069edSVladimir Zapolskiy .probe = lpc32xx_hsuart_probe, 108f21069edSVladimir Zapolskiy .ops = &lpc32xx_hsuart_ops, 109f21069edSVladimir Zapolskiy .priv_auto_alloc_size = sizeof(struct lpc32xx_hsuart_priv), 110f21069edSVladimir Zapolskiy .flags = DM_FLAG_PRE_RELOC, 111f21069edSVladimir Zapolskiy }; 112