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mmc: pic32: Refresh PIC32 MMC driver

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The existing driver is not compatible with the Driver Model.

This patch makes the necessary changes while also removing obsolescent
calls/properties as follows:

- fdtdec_* calls replaced with dev_read_* equivalents;
- 'clock-freq-min-max' property replaced by querying the frequency of
  the source clock 'base_clk';
- The card detect erratum workaround is applied during probe rather than
  overriding get_cd.

The card detect workaround (Microchip ref. DS80000736E, erratum #15) is
not always needed and can be disabled using a vendor specific DT
property.

Signed-off-by: John Robertson <john.robertson@simiatec.com>
This commit is contained in:
John Robertson 2020-09-01 02:55:14 +00:00 • committed by Daniel Schwierzeck
parent 5949f36f08
commit 6978db36aa
1 changed files with 56 additions and 42 deletions
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98
drivers/mmc/pic32_sdhci.c
View file

@ -6,65 +6,76 @@
* Andrei Pistirica <andrei.pistirica@microchip.com>
*/
#include <common.h>
#include <dm.h>
#include <sdhci.h>
#include <linux/errno.h>
#include <mach/pic32.h>
#include <clk.h>
DECLARE_GLOBAL_DATA_PTR;
static int pic32_sdhci_get_cd(struct sdhci_host *host)
{
/* PIC32 SDHCI CD errata:
* - set CD_TEST and clear CD_TEST_INS bit
*/
sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL);
return 0;
}
static const struct sdhci_ops pic32_sdhci_ops = {
.get_cd = pic32_sdhci_get_cd,
struct pic32_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
};
static int pic32_sdhci_probe(struct udevice *dev)
{
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct pic32_sdhci_plat *plat = dev_get_platdata(dev);
struct sdhci_host *host = dev_get_priv(dev);
const void *fdt = gd->fdt_blob;
u32 f_min_max[2];
fdt_addr_t addr;
fdt_size_t size;
struct clk clk;
ulong clk_rate;
int ret;
addr = fdtdec_get_addr_size(fdt, dev_of_offset(dev), "reg", &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
host->ioaddr = ioremap(addr, size);
host->name = dev->name;
host->quirks = SDHCI_QUIRK_NO_HISPD_BIT;
host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"bus-width", 4);
host->ops = &pic32_sdhci_ops;
ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
"clock-freq-min-max", f_min_max, 2);
if (ret) {
printf("sdhci: clock-freq-min-max not found\n");
return ret;
}
host->max_clk = f_min_max[1];
ret = add_sdhci(host, 0, f_min_max[0]);
ret = clk_get_by_name(dev, "base_clk", &clk);
if (ret)
return ret;
clk_rate = clk_get_rate(&clk);
clk_free(&clk);
if (IS_ERR_VALUE(clk_rate))
return clk_rate;
host->ioaddr = dev_remap_addr(dev);
if (!host->ioaddr)
return -EINVAL;
host->name = dev->name;
host->quirks = SDHCI_QUIRK_NO_HISPD_BIT;
host->bus_width = dev_read_u32_default(dev, "bus-width", 4);
host->max_clk = clk_rate;
host->mmc = &plat->mmc;
host->mmc->dev = dev;
ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
if (ret)
return ret;
host->mmc->priv = host;
upriv->mmc = host->mmc;
ret = sdhci_probe(dev);
if (ret)
return ret;
if (!dev_read_bool(dev, "microchip,use-sdcd")) {
// Use workaround 1 for erratum #15 by default
u8 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
ctrl = (ctrl & ~SDHCI_CTRL_CD_TEST_INS) | SDHCI_CTRL_CD_TEST;
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
}
return 0;
}
static int pic32_sdhci_bind(struct udevice *dev)
{
struct pic32_sdhci_plat *plat = dev_get_platdata(dev);
return sdhci_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct udevice_id pic32_sdhci_ids[] = {
{ .compatible = "microchip,pic32mzda-sdhci" },
{ }
@ -74,6 +85,9 @@ U_BOOT_DRIVER(pic32_sdhci_drv) = {
.name = "pic32_sdhci",
.id = UCLASS_MMC,
.of_match = pic32_sdhci_ids,
.ops = &sdhci_ops,
.bind = pic32_sdhci_bind,
.probe = pic32_sdhci_probe,
.priv_auto_alloc_size = sizeof(struct sdhci_host),
.platdata_auto_alloc_size = sizeof(struct pic32_sdhci_plat)
};