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@@ -2,7 +2,7 @@
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* (C) Copyright 2009 SAMSUNG Electronics
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* Minkyu Kang <mk7.kang@samsung.com>
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* Jaehoon Chung <jh80.chung@samsung.com>
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- * Portions Copyright 2011-2012 NVIDIA Corporation
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+ * Portions Copyright 2011-2013 NVIDIA Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@@ -21,6 +21,7 @@
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#include <bouncebuf.h>
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#include <common.h>
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+#include <fdtdec.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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@@ -28,44 +29,14 @@
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#include <asm/arch-tegra/tegra_mmc.h>
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#include <mmc.h>
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-/* support 4 mmc hosts */
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-struct mmc mmc_dev[4];
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-struct mmc_host mmc_host[4];
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+DECLARE_GLOBAL_DATA_PTR;
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+struct mmc mmc_dev[MAX_HOSTS];
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+struct mmc_host mmc_host[MAX_HOSTS];
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-/**
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- * Get the host address and peripheral ID for a device. Devices are numbered
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- * from 0 to 3.
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- *
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- * @param host Structure to fill in (base, reg, mmc_id)
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- * @param dev_index Device index (0-3)
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- */
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-static void tegra_get_setup(struct mmc_host *host, int dev_index)
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-{
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- debug("tegra_get_setup: dev_index = %d\n", dev_index);
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-
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- switch (dev_index) {
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- case 1:
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- host->base = TEGRA_SDMMC3_BASE;
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- host->mmc_id = PERIPH_ID_SDMMC3;
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- break;
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- case 2:
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- host->base = TEGRA_SDMMC2_BASE;
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- host->mmc_id = PERIPH_ID_SDMMC2;
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- break;
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- case 3:
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- host->base = TEGRA_SDMMC1_BASE;
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- host->mmc_id = PERIPH_ID_SDMMC1;
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- break;
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- case 0:
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- default:
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- host->base = TEGRA_SDMMC4_BASE;
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- host->mmc_id = PERIPH_ID_SDMMC4;
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- break;
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- }
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-
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- host->reg = (struct tegra_mmc *)host->base;
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-}
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+#ifndef CONFIG_OF_CONTROL
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+#error "Please enable device tree support to use this driver"
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+#endif
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static void mmc_prepare_data(struct mmc_host *host, struct mmc_data *data,
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struct bounce_buffer *bbstate)
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@@ -518,41 +489,43 @@ int tegra_mmc_getcd(struct mmc *mmc)
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debug("tegra_mmc_getcd called\n");
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- if (host->cd_gpio >= 0)
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- return !gpio_get_value(host->cd_gpio);
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+ if (fdt_gpio_isvalid(&host->cd_gpio))
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+ return fdtdec_get_gpio(&host->cd_gpio);
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return 1;
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}
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-int tegra_mmc_init(int dev_index, int bus_width, int pwr_gpio, int cd_gpio)
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+static int do_mmc_init(int dev_index)
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{
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struct mmc_host *host;
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char gpusage[12]; /* "SD/MMCn PWR" or "SD/MMCn CD" */
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struct mmc *mmc;
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- debug(" tegra_mmc_init: index %d, bus width %d "
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- "pwr_gpio %d cd_gpio %d\n",
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- dev_index, bus_width, pwr_gpio, cd_gpio);
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-
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+ /* DT should have been read & host config filled in */
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host = &mmc_host[dev_index];
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+ if (!host->enabled)
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+ return -1;
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- host->clock = 0;
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- host->pwr_gpio = pwr_gpio;
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- host->cd_gpio = cd_gpio;
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- tegra_get_setup(host, dev_index);
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+ debug(" do_mmc_init: index %d, bus width %d "
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+ "pwr_gpio %d cd_gpio %d\n",
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+ dev_index, host->width,
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+ host->pwr_gpio.gpio, host->cd_gpio.gpio);
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+ host->clock = 0;
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clock_start_periph_pll(host->mmc_id, CLOCK_ID_PERIPH, 20000000);
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- if (host->pwr_gpio >= 0) {
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+ if (fdt_gpio_isvalid(&host->pwr_gpio)) {
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sprintf(gpusage, "SD/MMC%d PWR", dev_index);
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- gpio_request(host->pwr_gpio, gpusage);
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- gpio_direction_output(host->pwr_gpio, 1);
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+ gpio_request(host->pwr_gpio.gpio, gpusage);
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+ gpio_direction_output(host->pwr_gpio.gpio, 1);
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+ debug(" Power GPIO name = %s\n", host->pwr_gpio.name);
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}
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- if (host->cd_gpio >= 0) {
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+ if (fdt_gpio_isvalid(&host->cd_gpio)) {
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sprintf(gpusage, "SD/MMC%d CD", dev_index);
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- gpio_request(host->cd_gpio, gpusage);
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- gpio_direction_input(host->cd_gpio);
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+ gpio_request(host->cd_gpio.gpio, gpusage);
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+ gpio_direction_input(host->cd_gpio.gpio);
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+ debug(" CD GPIO name = %s\n", host->cd_gpio.name);
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}
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mmc = &mmc_dev[dev_index];
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@@ -567,9 +540,9 @@ int tegra_mmc_init(int dev_index, int bus_width, int pwr_gpio, int cd_gpio)
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mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
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mmc->host_caps = 0;
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- if (bus_width == 8)
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+ if (host->width == 8)
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mmc->host_caps |= MMC_MODE_8BIT;
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- if (bus_width >= 4)
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+ if (host->width >= 4)
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mmc->host_caps |= MMC_MODE_4BIT;
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mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_HC;
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@@ -578,8 +551,6 @@ int tegra_mmc_init(int dev_index, int bus_width, int pwr_gpio, int cd_gpio)
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* low-speed SDIO card frequency (actually 400KHz)
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* max freq is highest HS eMMC clock as per the SD/MMC spec
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* (actually 52MHz)
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- * Both of these are the closest equivalents w/216MHz source
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- * clock and Tegra SDMMC divisors.
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*/
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mmc->f_min = 375000;
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mmc->f_max = 48000000;
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@@ -588,3 +559,95 @@ int tegra_mmc_init(int dev_index, int bus_width, int pwr_gpio, int cd_gpio)
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return 0;
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}
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+
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+/**
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+ * Get the host address and peripheral ID for a node.
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+ *
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+ * @param blob fdt blob
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+ * @param node Device index (0-3)
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+ * @param host Structure to fill in (reg, width, mmc_id)
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+ */
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+static int mmc_get_config(const void *blob, int node, struct mmc_host *host)
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+{
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+ debug("%s: node = %d\n", __func__, node);
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+
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+ host->enabled = fdtdec_get_is_enabled(blob, node);
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+
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+ host->reg = (struct tegra_mmc *)fdtdec_get_addr(blob, node, "reg");
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+ if ((fdt_addr_t)host->reg == FDT_ADDR_T_NONE) {
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+ debug("%s: no sdmmc base reg info found\n", __func__);
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+ return -FDT_ERR_NOTFOUND;
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+ }
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+
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+ host->mmc_id = clock_decode_periph_id(blob, node);
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+ if (host->mmc_id == PERIPH_ID_NONE) {
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+ debug("%s: could not decode periph id\n", __func__);
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+ return -FDT_ERR_NOTFOUND;
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+ }
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+
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+ /*
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+ * NOTE: mmc->bus_width is determined by mmc.c dynamically.
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+ * TBD: Override it with this value?
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+ */
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+ host->width = fdtdec_get_int(blob, node, "bus-width", 0);
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+ if (!host->width)
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+ debug("%s: no sdmmc width found\n", __func__);
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+
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+ /* These GPIOs are optional */
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+ fdtdec_decode_gpio(blob, node, "cd-gpios", &host->cd_gpio);
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+ fdtdec_decode_gpio(blob, node, "wp-gpios", &host->wp_gpio);
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+ fdtdec_decode_gpio(blob, node, "power-gpios", &host->pwr_gpio);
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+
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+ debug("%s: found controller at %p, width = %d, periph_id = %d\n",
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+ __func__, host->reg, host->width, host->mmc_id);
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+ return 0;
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+}
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+
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+/*
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+ * Process a list of nodes, adding them to our list of SDMMC ports.
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+ *
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+ * @param blob fdt blob
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+ * @param node_list list of nodes to process (any <=0 are ignored)
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+ * @param count number of nodes to process
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+ * @return 0 if ok, -1 on error
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+ */
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+static int process_nodes(const void *blob, int node_list[], int count)
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+{
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+ struct mmc_host *host;
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+ int i, node;
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+
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+ debug("%s: count = %d\n", __func__, count);
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+
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+ /* build mmc_host[] for each controller */
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+ for (i = 0; i < count; i++) {
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+ node = node_list[i];
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+ if (node <= 0)
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+ continue;
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+
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+ host = &mmc_host[i];
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+ host->id = i;
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+
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+ if (mmc_get_config(blob, node, host)) {
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+ printf("%s: failed to decode dev %d\n", __func__, i);
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+ return -1;
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+ }
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+ do_mmc_init(i);
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+ }
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+ return 0;
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+}
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+
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+void tegra_mmc_init(void)
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+{
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+ int node_list[MAX_HOSTS], count;
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+ const void *blob = gd->fdt_blob;
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+ debug("%s entry\n", __func__);
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+
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+ count = fdtdec_find_aliases_for_id(blob, "sdhci",
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+ COMPAT_NVIDIA_TEGRA20_SDMMC, node_list, MAX_HOSTS);
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+ debug("%s: count of sdhci nodes is %d\n", __func__, count);
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+
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+ if (process_nodes(blob, node_list, count)) {
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+ printf("%s: Error processing mmc node(s)!\n", __func__);
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+ return;
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+ }
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+}
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Tom Warren