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177 lines
4.5 KiB
177 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/io.h> |
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#include <linux/mcb.h> |
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#include <linux/serial.h> |
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#include <linux/serial_core.h> |
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#include <linux/serial_8250.h> |
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#include <uapi/linux/serial_core.h> |
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#define MEN_UART_ID_Z025 0x19 |
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#define MEN_UART_ID_Z057 0x39 |
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#define MEN_UART_ID_Z125 0x7d |
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#define MEN_UART_MEM_SIZE 0x10 |
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struct serial_8250_men_mcb_data { |
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struct uart_8250_port uart; |
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int line; |
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}; |
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/* |
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* The Z125 16550-compatible UART has no fixed base clock assigned |
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* So, depending on the board we're on, we need to adjust the |
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* parameter in order to really set the correct baudrate, and |
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* do so if possible without user interaction |
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*/ |
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static u32 men_lookup_uartclk(struct mcb_device *mdev) |
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{ |
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/* use default value if board is not available below */ |
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u32 clkval = 1041666; |
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dev_info(&mdev->dev, "%s on board %s\n", |
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dev_name(&mdev->dev), |
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mdev->bus->name); |
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if (strncmp(mdev->bus->name, "F075", 4) == 0) |
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clkval = 1041666; |
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else if (strncmp(mdev->bus->name, "F216", 4) == 0) |
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clkval = 1843200; |
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else if (strncmp(mdev->bus->name, "G215", 4) == 0) |
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clkval = 1843200; |
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else if (strncmp(mdev->bus->name, "F210", 4) == 0) |
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clkval = 115200; |
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else |
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dev_info(&mdev->dev, |
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"board not detected, using default uartclk\n"); |
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clkval = clkval << 4; |
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return clkval; |
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} |
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static int get_num_ports(struct mcb_device *mdev, |
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void __iomem *membase) |
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{ |
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switch (mdev->id) { |
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case MEN_UART_ID_Z125: |
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return 1U; |
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case MEN_UART_ID_Z025: |
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return readb(membase) >> 4; |
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case MEN_UART_ID_Z057: |
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return 4U; |
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default: |
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dev_err(&mdev->dev, "no supported device!\n"); |
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return -ENODEV; |
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} |
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} |
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static int serial_8250_men_mcb_probe(struct mcb_device *mdev, |
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const struct mcb_device_id *id) |
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{ |
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struct serial_8250_men_mcb_data *data; |
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struct resource *mem; |
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int num_ports; |
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int i; |
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void __iomem *membase; |
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mem = mcb_get_resource(mdev, IORESOURCE_MEM); |
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if (mem == NULL) |
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return -ENXIO; |
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membase = devm_ioremap_resource(&mdev->dev, mem); |
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if (IS_ERR(membase)) |
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return PTR_ERR_OR_ZERO(membase); |
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num_ports = get_num_ports(mdev, membase); |
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dev_dbg(&mdev->dev, "found a 16z%03u with %u ports\n", |
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mdev->id, num_ports); |
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if (num_ports <= 0 || num_ports > 4) { |
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dev_err(&mdev->dev, "unexpected number of ports: %u\n", |
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num_ports); |
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return -ENODEV; |
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} |
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data = devm_kcalloc(&mdev->dev, num_ports, |
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sizeof(struct serial_8250_men_mcb_data), |
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GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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mcb_set_drvdata(mdev, data); |
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for (i = 0; i < num_ports; i++) { |
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data[i].uart.port.dev = mdev->dma_dev; |
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spin_lock_init(&data[i].uart.port.lock); |
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data[i].uart.port.type = PORT_16550; |
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data[i].uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ |
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| UPF_FIXED_TYPE; |
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data[i].uart.port.iotype = UPIO_MEM; |
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data[i].uart.port.uartclk = men_lookup_uartclk(mdev); |
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data[i].uart.port.regshift = 0; |
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data[i].uart.port.irq = mcb_get_irq(mdev); |
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data[i].uart.port.membase = membase; |
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data[i].uart.port.fifosize = 60; |
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data[i].uart.port.mapbase = (unsigned long) mem->start |
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+ i * MEN_UART_MEM_SIZE; |
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data[i].uart.port.iobase = data[i].uart.port.mapbase; |
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/* ok, register the port */ |
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data[i].line = serial8250_register_8250_port(&data[i].uart); |
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if (data[i].line < 0) { |
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dev_err(&mdev->dev, "unable to register UART port\n"); |
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return data[i].line; |
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} |
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dev_info(&mdev->dev, "found MCB UART: ttyS%d\n", data[i].line); |
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} |
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return 0; |
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} |
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static void serial_8250_men_mcb_remove(struct mcb_device *mdev) |
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{ |
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int num_ports, i; |
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struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev); |
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if (!data) |
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return; |
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num_ports = get_num_ports(mdev, data[0].uart.port.membase); |
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if (num_ports <= 0 || num_ports > 4) { |
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dev_err(&mdev->dev, "error retrieving number of ports!\n"); |
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return; |
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} |
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for (i = 0; i < num_ports; i++) |
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serial8250_unregister_port(data[i].line); |
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} |
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static const struct mcb_device_id serial_8250_men_mcb_ids[] = { |
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{ .device = MEN_UART_ID_Z025 }, |
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{ .device = MEN_UART_ID_Z057 }, |
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{ .device = MEN_UART_ID_Z125 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(mcb, serial_8250_men_mcb_ids); |
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static struct mcb_driver mcb_driver = { |
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.driver = { |
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.name = "8250_men_mcb", |
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.owner = THIS_MODULE, |
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}, |
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.probe = serial_8250_men_mcb_probe, |
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.remove = serial_8250_men_mcb_remove, |
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.id_table = serial_8250_men_mcb_ids, |
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}; |
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module_mcb_driver(mcb_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("MEN 8250 UART driver"); |
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MODULE_AUTHOR("Michael Moese <[email protected]"); |
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MODULE_ALIAS("mcb:16z125"); |
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MODULE_ALIAS("mcb:16z025"); |
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MODULE_ALIAS("mcb:16z057"); |
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MODULE_IMPORT_NS(MCB);
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