mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-04 18:41:03 +00:00
9539738509
Now that we have a 'positive' Kconfig option, use this instead of the negative one, which is harder to understand. Signed-off-by: Simon Glass <sjg@chromium.org>
142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Special driver to handle of-platdata
|
|
*
|
|
* Copyright 2019 Google LLC
|
|
*
|
|
* Some code from coreboot lpss.c
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <dt-structs.h>
|
|
#include <malloc.h>
|
|
#include <ns16550.h>
|
|
#include <spl.h>
|
|
#include <asm/io.h>
|
|
#include <asm/pci.h>
|
|
#include <asm/lpss.h>
|
|
#include <dm/device-internal.h>
|
|
#include <asm/arch/uart.h>
|
|
|
|
/* Low-power Subsystem (LPSS) clock register */
|
|
enum {
|
|
LPSS_CLOCK_CTL_REG = 0x200,
|
|
LPSS_CNT_CLOCK_EN = 1,
|
|
LPSS_CNT_CLK_UPDATE = 1U << 31,
|
|
LPSS_CLOCK_DIV_N_SHIFT = 16,
|
|
LPSS_CLOCK_DIV_N_MASK = 0x7fff << LPSS_CLOCK_DIV_N_SHIFT,
|
|
LPSS_CLOCK_DIV_M_SHIFT = 1,
|
|
LPSS_CLOCK_DIV_M_MASK = 0x7fff << LPSS_CLOCK_DIV_M_SHIFT,
|
|
|
|
/* These set the UART input clock speed */
|
|
LPSS_UART_CLK_M_VAL = 0x25a,
|
|
LPSS_UART_CLK_N_VAL = 0x7fff,
|
|
};
|
|
|
|
static void lpss_clk_update(void *regs, u32 clk_m_val, u32 clk_n_val)
|
|
{
|
|
u32 clk_sel;
|
|
|
|
clk_sel = clk_n_val << LPSS_CLOCK_DIV_N_SHIFT |
|
|
clk_m_val << LPSS_CLOCK_DIV_M_SHIFT;
|
|
clk_sel |= LPSS_CNT_CLK_UPDATE | LPSS_CNT_CLOCK_EN;
|
|
|
|
writel(clk_sel, regs + LPSS_CLOCK_CTL_REG);
|
|
}
|
|
|
|
static void uart_lpss_init(void *regs)
|
|
{
|
|
/* Take UART out of reset */
|
|
lpss_reset_release(regs);
|
|
|
|
/* Set M and N divisor inputs and enable clock */
|
|
lpss_clk_update(regs, LPSS_UART_CLK_M_VAL, LPSS_UART_CLK_N_VAL);
|
|
}
|
|
|
|
void apl_uart_init(pci_dev_t bdf, ulong base)
|
|
{
|
|
/* Set UART base address */
|
|
pci_x86_write_config(bdf, PCI_BASE_ADDRESS_0, base, PCI_SIZE_32);
|
|
|
|
/* Enable memory access and bus master */
|
|
pci_x86_write_config(bdf, PCI_COMMAND, PCI_COMMAND_MEMORY |
|
|
PCI_COMMAND_MASTER, PCI_SIZE_32);
|
|
|
|
uart_lpss_init((void *)base);
|
|
}
|
|
|
|
/*
|
|
* This driver uses its own compatible string but almost everything else from
|
|
* the standard ns16550 driver. This allows us to provide an of-platdata
|
|
* implementation, since the platdata produced by of-platdata does not match
|
|
* struct apl_ns16550_plat.
|
|
*
|
|
* When running with of-platdata (generally TPL), the platdata is converted to
|
|
* something that ns16550 expects. When running withoutof-platdata (SPL, U-Boot
|
|
* proper), we use ns16550's of_to_plat routine.
|
|
*/
|
|
|
|
static int apl_ns16550_probe(struct udevice *dev)
|
|
{
|
|
struct apl_ns16550_plat *plat = dev_get_plat(dev);
|
|
|
|
if (!CONFIG_IS_ENABLED(PCI))
|
|
apl_uart_init(plat->ns16550.bdf, plat->ns16550.base);
|
|
|
|
return ns16550_serial_probe(dev);
|
|
}
|
|
|
|
static int apl_ns16550_of_to_plat(struct udevice *dev)
|
|
{
|
|
#if CONFIG_IS_ENABLED(OF_PLATDATA)
|
|
struct dtd_intel_apl_ns16550 *dtplat;
|
|
struct apl_ns16550_plat *plat = dev_get_plat(dev);
|
|
struct ns16550_plat ns;
|
|
|
|
/*
|
|
* The device's plat uses struct apl_ns16550_plat which starts with the
|
|
* dtd struct, but the ns16550 driver expects it to be struct ns16550.
|
|
* Set up what that driver expects. Note that this means that the values
|
|
* cannot be read in this driver when using of-platdata.
|
|
*
|
|
* TODO(sjg@chromium.org): Consider having a separate plat pointer for
|
|
* of-platdata so that it is not necessary to overwrite this.
|
|
*/
|
|
dtplat = &plat->dtplat;
|
|
ns.base = dtplat->early_regs[0];
|
|
ns.reg_width = 1;
|
|
ns.reg_shift = dtplat->reg_shift;
|
|
ns.reg_offset = 0;
|
|
ns.clock = dtplat->clock_frequency;
|
|
ns.fcr = UART_FCR_DEFVAL;
|
|
ns.bdf = pci_ofplat_get_devfn(dtplat->reg[0]);
|
|
memcpy(plat, &ns, sizeof(ns));
|
|
#else
|
|
int ret;
|
|
|
|
ret = ns16550_serial_of_to_plat(dev);
|
|
if (ret)
|
|
return ret;
|
|
#endif /* OF_PLATDATA */
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(OF_REAL)
|
|
static const struct udevice_id apl_ns16550_serial_ids[] = {
|
|
{ .compatible = "intel,apl-ns16550" },
|
|
{ },
|
|
};
|
|
#endif
|
|
|
|
U_BOOT_DRIVER(intel_apl_ns16550) = {
|
|
.name = "intel_apl_ns16550",
|
|
.id = UCLASS_SERIAL,
|
|
.of_match = of_match_ptr(apl_ns16550_serial_ids),
|
|
.plat_auto = sizeof(struct apl_ns16550_plat),
|
|
.priv_auto = sizeof(struct ns16550),
|
|
.ops = &ns16550_serial_ops,
|
|
.of_to_plat = apl_ns16550_of_to_plat,
|
|
.probe = apl_ns16550_probe,
|
|
};
|