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https://github.com/brain-hackers/u-boot-brain
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caa4daa2ae
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Special driver to handle of-platdata
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*
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* Copyright 2019 Google LLC
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*
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* Some code from coreboot lpss.c
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*/
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#include <common.h>
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#include <dm.h>
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#include <dt-structs.h>
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#include <malloc.h>
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#include <ns16550.h>
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#include <spl.h>
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#include <asm/io.h>
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#include <asm/pci.h>
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#include <asm/lpss.h>
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/* Low-power Subsystem (LPSS) clock register */
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enum {
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LPSS_CLOCK_CTL_REG = 0x200,
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LPSS_CNT_CLOCK_EN = 1,
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LPSS_CNT_CLK_UPDATE = 1U << 31,
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LPSS_CLOCK_DIV_N_SHIFT = 16,
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LPSS_CLOCK_DIV_N_MASK = 0x7fff << LPSS_CLOCK_DIV_N_SHIFT,
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LPSS_CLOCK_DIV_M_SHIFT = 1,
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LPSS_CLOCK_DIV_M_MASK = 0x7fff << LPSS_CLOCK_DIV_M_SHIFT,
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/* These set the UART input clock speed */
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LPSS_UART_CLK_M_VAL = 0x25a,
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LPSS_UART_CLK_N_VAL = 0x7fff,
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};
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static void lpss_clk_update(void *regs, u32 clk_m_val, u32 clk_n_val)
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{
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u32 clk_sel;
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clk_sel = clk_n_val << LPSS_CLOCK_DIV_N_SHIFT |
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clk_m_val << LPSS_CLOCK_DIV_M_SHIFT;
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clk_sel |= LPSS_CNT_CLK_UPDATE | LPSS_CNT_CLOCK_EN;
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writel(clk_sel, regs + LPSS_CLOCK_CTL_REG);
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}
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static void uart_lpss_init(void *regs)
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{
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/* Take UART out of reset */
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lpss_reset_release(regs);
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/* Set M and N divisor inputs and enable clock */
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lpss_clk_update(regs, LPSS_UART_CLK_M_VAL, LPSS_UART_CLK_N_VAL);
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}
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void apl_uart_init(pci_dev_t bdf, ulong base)
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{
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/* Set UART base address */
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pci_x86_write_config(bdf, PCI_BASE_ADDRESS_0, base, PCI_SIZE_32);
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/* Enable memory access and bus master */
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pci_x86_write_config(bdf, PCI_COMMAND, PCI_COMMAND_MEMORY |
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PCI_COMMAND_MASTER, PCI_SIZE_32);
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uart_lpss_init((void *)base);
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}
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/*
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* This driver uses its own compatible string but almost everything else from
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* the standard ns16550 driver. This allows us to provide an of-platdata
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* implementation, since the platdata produced by of-platdata does not match
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* struct ns16550_platdata.
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*
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* When running with of-platdata (generally TPL), the platdata is converted to
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* something that ns16550 expects. When running withoutof-platdata (SPL, U-Boot
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* proper), we use ns16550's ofdata_to_platdata routine.
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*/
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static int apl_ns16550_probe(struct udevice *dev)
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{
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struct ns16550_platdata *plat = dev_get_platdata(dev);
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if (!CONFIG_IS_ENABLED(PCI))
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apl_uart_init(plat->bdf, plat->base);
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return ns16550_serial_probe(dev);
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}
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static int apl_ns16550_ofdata_to_platdata(struct udevice *dev)
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{
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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struct dtd_intel_apl_ns16550 *dtplat = dev_get_platdata(dev);
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struct ns16550_platdata *plat;
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/*
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* Convert our plat to the ns16550's plat, so we can just use
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* that driver
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*/
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plat = malloc(sizeof(*plat));
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if (!plat)
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return -ENOMEM;
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plat->base = dtplat->early_regs[0];
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plat->reg_width = 1;
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plat->reg_shift = dtplat->reg_shift;
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plat->reg_offset = 0;
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plat->clock = dtplat->clock_frequency;
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plat->fcr = UART_FCR_DEFVAL;
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plat->bdf = pci_ofplat_get_devfn(dtplat->reg[0]);
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dev->plat = plat;
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#else
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int ret;
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ret = ns16550_serial_ofdata_to_platdata(dev);
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if (ret)
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return ret;
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#endif /* OF_PLATDATA */
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return 0;
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}
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static const struct udevice_id apl_ns16550_serial_ids[] = {
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{ .compatible = "intel,apl-ns16550" },
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{ },
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};
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U_BOOT_DRIVER(intel_apl_ns16550) = {
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.name = "intel_apl_ns16550",
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.id = UCLASS_SERIAL,
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.of_match = apl_ns16550_serial_ids,
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.plat_auto = sizeof(struct ns16550_platdata),
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.priv_auto = sizeof(struct NS16550),
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.ops = &ns16550_serial_ops,
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.ofdata_to_platdata = apl_ns16550_ofdata_to_platdata,
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.probe = apl_ns16550_probe,
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};
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