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From f88da9e21d8eff58eeb9280ae96bf9593121d8eb Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Wed, 12 Oct 2022 13:24:51 +0100
Subject: [PATCH] serial: pl011: rp1 uart support
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
drivers/tty/serial/amba-pl011.c | 96 +++++++++++++++++++++++++++++++++
1 file changed, 96 insertions(+)
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -152,6 +152,20 @@ static const struct vendor_data vendor_s
.fixed_options = true,
};
+static struct vendor_data vendor_arm_axi = {
+ .reg_offset = pl011_std_offsets,
+ .ifls = UART011_IFLS_RX4_8 | UART011_IFLS_TX4_8,
+ .fr_busy = UART01x_FR_BUSY,
+ .fr_dsr = UART01x_FR_DSR,
+ .fr_cts = UART01x_FR_CTS,
+ .fr_ri = UART011_FR_RI,
+ .oversampling = false,
+ .dma_threshold = false,
+ .cts_event_workaround = false,
+ .always_enabled = false,
+ .fixed_options = false,
+};
+
#ifdef CONFIG_ACPI_SPCR_TABLE
static const struct vendor_data vendor_qdt_qdf2400_e44 = {
.reg_offset = pl011_std_offsets,
@@ -2972,6 +2986,86 @@ static struct platform_driver arm_sbsa_u
},
};
+static int pl011_axi_probe(struct platform_device *pdev)
+{
+ struct uart_amba_port *uap;
+ struct vendor_data *vendor = &vendor_arm_axi;
+ struct resource *r;
+ unsigned int periphid;
+ int portnr, ret, irq;
+
+ portnr = pl011_find_free_port();
+ if (portnr < 0)
+ return portnr;
+
+ uap = devm_kzalloc(&pdev->dev, sizeof(struct uart_amba_port),
+ GFP_KERNEL);
+ if (!uap)
+ return -ENOMEM;
+
+ uap->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(uap->clk))
+ return PTR_ERR(uap->clk);
+
+ if (of_property_read_bool(pdev->dev.of_node, "cts-event-workaround")) {
+ vendor->cts_event_workaround = true;
+ dev_info(&pdev->dev, "cts_event_workaround enabled\n");
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ periphid = 0x00241011; /* A safe default */
+ of_property_read_u32(pdev->dev.of_node, "arm,primecell-periphid",
+ &periphid);
+
+ uap->reg_offset = vendor->reg_offset;
+ uap->vendor = vendor;
+ uap->fifosize = (AMBA_REV_BITS(periphid) < 3) ? 16 : 32;
+ uap->port.iotype = vendor->access_32b ? UPIO_MEM32 : UPIO_MEM;
+ uap->port.irq = irq;
+ uap->port.ops = &amba_pl011_pops;
+
+ snprintf(uap->type, sizeof(uap->type), "PL011 AXI");
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ ret = pl011_setup_port(&pdev->dev, uap, r, portnr);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, uap);
+
+ return pl011_register_port(uap);
+}
+
+static int pl011_axi_remove(struct platform_device *pdev)
+{
+ struct uart_amba_port *uap = platform_get_drvdata(pdev);
+
+ uart_remove_one_port(&amba_reg, &uap->port);
+ pl011_unregister_port(uap);
+ return 0;
+}
+
+static const struct of_device_id pl011_axi_of_match[] = {
+ { .compatible = "arm,pl011-axi" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pl011_axi_of_match);
+
+static struct platform_driver pl011_axi_platform_driver = {
+ .probe = pl011_axi_probe,
+ .remove = pl011_axi_remove,
+ .driver = {
+ .name = "pl011-axi",
+ .pm = &pl011_dev_pm_ops,
+ .of_match_table = of_match_ptr(pl011_axi_of_match),
+ .suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_AMBA_PL011),
+ },
+};
+
static const struct amba_id pl011_ids[] = {
{
.id = 0x00041011,
@@ -3005,6 +3099,8 @@ static int __init pl011_init(void)
if (platform_driver_register(&arm_sbsa_uart_platform_driver))
pr_warn("could not register SBSA UART platform driver\n");
+ if (platform_driver_register(&pl011_axi_platform_driver))
+ pr_warn("could not register PL011 AXI platform driver\n");
return amba_driver_register(&pl011_driver);
}
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