| Message ID | 1378997801-21986-1-git-send-email-gdjakov@mm-sol.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
Hi Georgi, Several comments bellow. On Thu, 2013-09-12 at 17:56 +0300, Georgi Djakov wrote: > This platform driver adds the support of Secure Digital Host Controller > Interface compliant controller found in Qualcomm MSM chipsets. > > CC: Asutosh Das <asutoshd@codeaurora.org> > CC: Venkat Gopalakrishnan <venkatg@codeaurora.org> > CC: Sahitya Tummala <stummala@codeaurora.org> > CC: Subhash Jadavani <subhashj@codeaurora.org> > Signed-off-by: Georgi Djakov <gdjakov@mm-sol.com> > --- > Changes from v3: > - Allocate memory for all required structs at once > - Added termination entry in sdhci_msm_dt_match[] > - Fixed a missing sdhci_pltfm_free() in probe() > - Removed redundant of_match_ptr > - Removed the unneeded function sdhci_msm_vreg_reset() > > Changes from v2: > - Added DT bindings for clocks > - Moved voltage regulators data to platform data > - Removed unneeded includes > - Removed obsolete and wrapper functions > - Removed error checking where unnecessary > - Removed redundant _clk suffix from clock names > - Just return instead of goto where possible > - Minor fixes > > Changes from v1: > - GPIO references are replaced by pinctrl > - DT parsing is done mostly by mmc_of_parse() > - Use of_match_device() for DT matching > - A few minor changes > > .../devicetree/bindings/mmc/sdhci-msm.txt | 71 +++ > drivers/mmc/host/Kconfig | 13 + > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/sdhci-msm.c | 660 ++++++++++++++++++++ > 4 files changed, 745 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-msm.txt > create mode 100644 drivers/mmc/host/sdhci-msm.c > > diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > new file mode 100644 > index 0000000..ee112da > --- /dev/null > +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt > @@ -0,0 +1,71 @@ > +* Qualcomm SDHCI controller (sdhci-msm) > + > +This file documents differences between the core properties in mmc.txt > +and the properties used by the sdhci-msm driver. > + > +Required properties: > +- compatible: should be "qcom,sdhci-msm" > +- reg: should contain SDHC, SD Core register map > +- reg-names: indicates various resources passed to driver (via reg proptery) by name > + "reg-names" examples are "hc_mem" and "core_mem" > +- interrupts: should contain SDHC interrupts > +- interrupt-names: indicates interrupts passed to driver (via interrupts property) by name > + "interrupt-names" examples are "hc_irq" and "pwr_irq" > +- <supply-name>-supply: phandle to the regulator device tree node > + "supply-name" examples are "vdd" and "vdd-io" > +- pinctrl-names: Should contain only one value - "default". > +- pinctrl-0: Should specify pin control groups used for this controller. > +- clocks: phandles to clock instances of the device tree nodes > +- clock-names: > + iface: Main peripheral bus clock (PCLK/HCLK - AHB Bus clock) (required) > + core: SDC MMC clock (MCLK) (required) > + bus: SDCC bus voter clock (optional) > + > +Optional properties: > +- qcom,bus-speed-mode - specifies supported bus speed modes by host > + The supported bus speed modes are : > + "HS200_1p8v" - indicates that host can support HS200 at 1.8v > + "HS200_1p2v" - indicates that host can support HS200 at 1.2v > + "DDR_1p8v" - indicates that host can support DDR mode at 1.8v > + "DDR_1p2v" - indicates that host can support DDR mode at 1.2v > + > +In the following, <supply> can be vdd (flash core voltage) or vdd-io (I/O voltage). > +- qcom,<supply>-always-on - specifies whether supply should be kept "on" always. > +- qcom,<supply>-lpm-sup - specifies whether supply can be kept in low power mode (lpm). > +- qcom,<supply>-voltage-level - specifies voltage levels for supply. Should be > +specified in pairs (min, max), units uV. > +- qcom,<supply>-current-level - specifies load levels for supply in lpm or high power mode > + (hpm). Should be specified in pairs (lpm, hpm), units uA. > + > +Example: > + > + aliases { > + sdhc1 = &sdhc_1; > + }; > + > + sdhc_1: qcom,sdhc@f9824900 { > + compatible = "qcom,sdhci-msm"; > + reg = <0xf9824900 0x11c>, <0xf9824000 0x800>; > + reg-names = "hc_mem", "core_mem"; > + interrupts = <0 123 0>, <0 138 0>; > + interrupt-names = "hc_irq", "pwr_irq"; > + bus-width = <4>; > + non-removable; > + > + vdd-supply = <&pm8941_l21>; > + vdd-io-supply = <&pm8941_l13>; > + qcom,vdd-voltage-level = <2950000 2950000>; > + qcom,vdd-current-level = <9000 800000>; > + qcom,vdd-io-always-on; > + qcom,vdd-io-lpm-sup; > + qcom,vdd-io-voltage-level = <1800000 2950000>; > + qcom,vdd-io-current-level = <6 22000>; > + qcom,bus-speed-mode = "HS200_1p8v", "DDR_1p8v"; > + > + pinctrl-names = "default"; > + pinctrl-0 = <&sdc1_clk &sdc1_cmd &sdc1_data>; > + > + clocks = <&iface>, <&core>, <&bus>; > + clock-names = "iface", "core", "bus"; > + > + }; > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig > index b7fd5ab..b2a1fdb 100644 > --- a/drivers/mmc/host/Kconfig > +++ b/drivers/mmc/host/Kconfig > @@ -322,6 +322,19 @@ config MMC_ATMELMCI > > If unsure, say N. > > +config MMC_SDHCI_MSM > + tristate "Qualcomm SDHCI Controller Support" > + depends on ARCH_MSM > + depends on MMC_SDHCI_PLTFM > + help > + This selects the Secure Digital Host Controller Interface (SDHCI) > + support present in MSM SOCs from Qualcomm. The controller > + supports SD/MMC/SDIO devices. > + > + If you have a controller with this interface, say Y or M here. > + > + If unsure, say N. > + > config MMC_MSM > tristate "Qualcomm SDCC Controller Support" > depends on MMC && ARCH_MSM > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile > index c41d0c3..5faed14 100644 > --- a/drivers/mmc/host/Makefile > +++ b/drivers/mmc/host/Makefile > @@ -61,6 +61,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o > obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o > obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o > obj-$(CONFIG_MMC_SDHCI_BCM2835) += sdhci-bcm2835.o > +obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o > > ifeq ($(CONFIG_CB710_DEBUG),y) > CFLAGS-cb710-mmc += -DDEBUG > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > new file mode 100644 > index 0000000..904158d > --- /dev/null > +++ b/drivers/mmc/host/sdhci-msm.c > @@ -0,0 +1,660 @@ > +/* > + * drivers/mmc/host/sdhci-msm.c - Qualcomm MSM SDHCI Platform > + * driver source file > + * > + * Copyright (c) 2013, The Linux Foundation. All rights reserved. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 and > + * only version 2 as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/pinctrl/consumer.h> > +#include <linux/regulator/consumer.h> > + > +#include "sdhci-pltfm.h" > + > +#define CORE_HC_MODE 0x78 > +#define HC_MODE_EN 0x1 > + > +#define CORE_POWER 0x0 > +#define CORE_SW_RST (1 << 7) > + > +#define CORE_PWRCTL_STATUS 0xdc > +#define CORE_PWRCTL_MASK 0xe0 > +#define CORE_PWRCTL_CLEAR 0xe4 > +#define CORE_PWRCTL_CTL 0xe8 > + > +#define CORE_PWRCTL_BUS_OFF 0x01 > +#define CORE_PWRCTL_BUS_ON (1 << 1) > +#define CORE_PWRCTL_IO_LOW (1 << 2) > +#define CORE_PWRCTL_IO_HIGH (1 << 3) > + > +#define CORE_PWRCTL_BUS_SUCCESS 0x01 > +#define CORE_PWRCTL_BUS_FAIL (1 << 1) > +#define CORE_PWRCTL_IO_SUCCESS (1 << 2) > +#define CORE_PWRCTL_IO_FAIL (1 << 3) > + > +#define INT_MASK 0xf > + > +/* This structure keeps information per regulator */ > +struct sdhci_msm_reg_data { > + /* voltage regulator handle */ > + struct regulator *reg; > + /* regulator name */ > + const char *name; > + /* voltage level to be set */ > + u32 low_vol_level; > + u32 high_vol_level; > + /* Load values for low power and high power mode */ > + u32 lpm_uA; > + u32 hpm_uA; > + > + /* is this regulator needs to be always on? */ > + bool is_always_on; > + /* is low power mode setting required for this regulator? */ > + bool lpm_sup; > +}; > + > +struct sdhci_msm_pltfm_data { > + u32 caps; /* Supported UHS-I Modes */ > + u32 caps2; /* More capabilities */ > + struct sdhci_msm_reg_data vdd_data; /* VDD/VCC regulator info */ > + struct sdhci_msm_reg_data vdd_io_data; /* VDD IO regulator info */ > +}; > + > +struct sdhci_msm_host { > + struct platform_device *pdev; > + void __iomem *core_mem; /* MSM SDCC mapped address */ > + int pwr_irq; /* power irq */ > + struct clk *clk; /* main SD/MMC bus clock */ > + struct clk *pclk; /* SDHC peripheral bus clock */ > + struct clk *bus_clk; /* SDHC bus voter clock */ > + struct sdhci_msm_pltfm_data pdata; > + struct mmc_host *mmc; > + struct sdhci_pltfm_data sdhci_msm_pdata; > +}; > + > +enum vdd_io_level { > + /* set vdd_io_data->low_vol_level */ > + VDD_IO_LOW, > + /* set vdd_io_data->high_vol_level */ > + VDD_IO_HIGH, > + /* > + * set whatever there in voltage_level (third argument) of > + * sdhci_msm_set_vdd_io_vol() function. > + */ > + VDD_IO_SET_LEVEL, > +}; > + > +#define MAX_PROP_SIZE 32 > +static int sdhci_msm_dt_parse_vreg_info(struct device *dev, > + struct sdhci_msm_reg_data *vreg, > + const char *vreg_name) > +{ > + int len, ret = 0; > + const __be32 *prop; > + char prop_name[MAX_PROP_SIZE]; > + struct device_node *np = dev->of_node; > + > + snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", vreg_name); > + if (!of_parse_phandle(np, prop_name, 0)) { > + dev_info(dev, "No vreg data found for %s\n", vreg_name); > + ret = -EINVAL; > + return ret; Just return -EINVAL? > + } > + > + if (!vreg) { This could not happen, right? > + dev_err(dev, "invalid vreg: %s\n", vreg_name); > + ret = -EINVAL; > + return ret; > + } > + > + vreg->name = vreg_name; > + > + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-always-on", vreg_name); > + if (of_get_property(np, prop_name, NULL)) > + vreg->is_always_on = true; > + > + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-lpm-sup", vreg_name); > + if (of_get_property(np, prop_name, NULL)) > + vreg->lpm_sup = true; > + > + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-voltage-level", vreg_name); > + prop = of_get_property(np, prop_name, &len); > + if (!prop || (len != (2 * sizeof(__be32)))) { > + dev_warn(dev, "%s %s property\n", > + prop ? "invalid format" : "no", prop_name); > + } else { > + vreg->low_vol_level = be32_to_cpup(&prop[0]); > + vreg->high_vol_level = be32_to_cpup(&prop[1]); > + } > + > + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-current-level", vreg_name); > + prop = of_get_property(np, prop_name, &len); > + if (!prop || (len != (2 * sizeof(__be32)))) { > + dev_warn(dev, "%s %s property\n", > + prop ? "invalid format" : "no", prop_name); > + } else { > + vreg->lpm_uA = be32_to_cpup(&prop[0]); > + vreg->hpm_uA = be32_to_cpup(&prop[1]); > + } > + > + dev_dbg(dev, "%s: %s %s vol=[%d %d]uV, curr=[%d %d]uA\n", > + vreg->name, vreg->is_always_on ? "always_on," : "", > + vreg->lpm_sup ? "lpm_sup," : "", vreg->low_vol_level, > + vreg->high_vol_level, vreg->lpm_uA, vreg->hpm_uA); > + > + return ret; > +} > + > +/* Parse platform data */ > +static int sdhci_msm_populate_pdata(struct device *dev, > + struct sdhci_msm_pltfm_data *pdata) > +{ > + struct device_node *np = dev->of_node; > + int len, i; > + > + if (!pdata) { This could not be null > + dev_err(dev, "invalid platform data\n"); > + return -EINVAL; > + } > + > + if (sdhci_msm_dt_parse_vreg_info(dev, &pdata->vdd_data, "vdd")) { > + dev_err(dev, "failed parsing vdd data\n"); > + return -EINVAL; > + } > + if (sdhci_msm_dt_parse_vreg_info(dev, &pdata->vdd_io_data, "vdd-io")) { > + dev_err(dev, "failed parsing vdd-io data\n"); > + return -EINVAL; > + } > + > + len = of_property_count_strings(np, "qcom,bus-speed-mode"); > + > + for (i = 0; i < len; i++) { > + const char *name = NULL; > + > + of_property_read_string_index(np, > + "qcom,bus-speed-mode", i, &name); > + if (!name) > + continue; > + > + if (!strncmp(name, "HS200_1p8v", sizeof("HS200_1p8v"))) > + pdata->caps2 |= MMC_CAP2_HS200_1_8V_SDR; > + else if (!strncmp(name, "HS200_1p2v", sizeof("HS200_1p2v"))) > + pdata->caps2 |= MMC_CAP2_HS200_1_2V_SDR; > + else if (!strncmp(name, "DDR_1p8v", sizeof("DDR_1p8v"))) > + pdata->caps |= MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50; > + else if (!strncmp(name, "DDR_1p2v", sizeof("DDR_1p2v"))) > + pdata->caps |= MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50; > + } > + > + return 0; > +} > + > +/* Regulator utility functions */ > +static int sdhci_msm_vreg_init_reg(struct device *dev, > + struct sdhci_msm_reg_data *vreg) > +{ > + int ret = 0; > + > + /* check if regulator is already initialized? */ > + if (!IS_ERR(vreg->reg)) This couldn't happen, right? > + return ret; > + > + /* Get the regulator handle */ > + vreg->reg = devm_regulator_get(dev, vreg->name); > + if (IS_ERR(vreg->reg)) { > + ret = PTR_ERR(vreg->reg); > + dev_err(dev, "devm_regulator_get(%s) failed. ret=%d\n", > + vreg->name, ret); > + return ret; > + } > + > + /* sanity check */ > + if (!vreg->high_vol_level || !vreg->hpm_uA) { > + dev_err(dev, "%s invalid constraints specified\n", vreg->name); > + return -EINVAL; > + } > + > + return ret; > +} > + > +static int sdhci_msm_vreg_enable(struct sdhci_msm_reg_data *vreg) > +{ > + int ret = 0; > + > + /* Put regulator in HPM (high power mode) */ > + ret = regulator_set_optimum_mode(vreg->reg, vreg->hpm_uA); > + if (ret < 0) { > + pr_err > + ("%s: regulator_set_optimum_mode(%s,uA_load=%d) fail(%d)\n", > + __func__, vreg->name, vreg->hpm_uA, ret); > + return ret; > + } > + > + if (!regulator_is_enabled(vreg->reg)) { > + /* Set voltage level */ > + ret = regulator_set_voltage(vreg->reg, vreg->high_vol_level, > + vreg->high_vol_level); > + if (ret) > + return ret; > + } > + ret = regulator_enable(vreg->reg); > + if (ret) { > + pr_err("%s: regulator_enable(%s) failed. ret=%d\n", > + __func__, vreg->name, ret); > + return ret; > + } > + return ret; > +} > + > +static int sdhci_msm_vreg_disable(struct sdhci_msm_reg_data *vreg) > +{ > + int ret = 0; > + > + /* Never disable regulator marked as always_on */ > + if (regulator_is_enabled(vreg->reg) && !vreg->is_always_on) { > + ret = regulator_disable(vreg->reg); > + if (ret) { > + pr_err("%s: regulator_disable(%s) failed. ret=%d\n", > + __func__, vreg->name, ret); The __func__ did not bring any useful information. Please, just use meaningful error messages. > + return ret; > + } > + > + ret = regulator_set_optimum_mode(vreg->reg, 0); > + if (ret < 0) > + return ret; > + > + /* Set min. voltage level to 0 */ > + ret = regulator_set_voltage(vreg->reg, 0, vreg->high_vol_level); > + if (ret) > + return ret; > + } else if (regulator_is_enabled(vreg->reg) && vreg->is_always_on) { > + if (vreg->lpm_sup) { > + /* Put always_on regulator in LPM (low power mode) */ > + ret = regulator_set_optimum_mode(vreg->reg, > + vreg->lpm_uA); > + if (ret < 0) > + return ret; > + } > + } > + You could check for !regulator_is_enabled(vreg->reg) at the beginning of the function and exit immediately. > + return ret; > +} > + > +static int sdhci_msm_setup_vreg(struct sdhci_msm_pltfm_data *pdata, > + bool enable, bool is_init) > +{ > + int ret = 0, i; > + struct sdhci_msm_reg_data *vreg_table[2]; > + > + vreg_table[0] = &pdata->vdd_data; > + vreg_table[1] = &pdata->vdd_io_data; > + > + for (i = 0; i < ARRAY_SIZE(vreg_table); i++) { > + if (vreg_table[i]) { > + if (enable) > + ret = sdhci_msm_vreg_enable(vreg_table[i]); > + else > + ret = sdhci_msm_vreg_disable(vreg_table[i]); > + if (ret) > + return ret; > + } > + } > + return ret; > +} > + > +/* This init function should be called only once for each SDHC slot */ > +static int sdhci_msm_vreg_init(struct device *dev, > + struct sdhci_msm_pltfm_data *pdata, bool is_init) > +{ > + int ret = 0; > + struct sdhci_msm_reg_data *curr_vdd_reg, *curr_vdd_io_reg; > + > + curr_vdd_reg = &pdata->vdd_data; > + curr_vdd_io_reg = &pdata->vdd_io_data; > + > + if (!is_init) Redundant parameter? > + /* Deregister all regulators from regulator framework */ > + return ret; > + > + /* > + * Get the regulator handle from voltage regulator framework > + * and then try to set the voltage level for the regulator > + */ > + if (curr_vdd_reg) { This is always true > + ret = sdhci_msm_vreg_init_reg(dev, curr_vdd_reg); > + if (ret) > + return ret; > + } > + if (curr_vdd_io_reg) { Same here. > + ret = sdhci_msm_vreg_init_reg(dev, curr_vdd_io_reg); > + if (ret) > + return ret; > + } > + > + return ret; > +} > + > +static int sdhci_msm_set_vdd_io_vol(struct sdhci_msm_pltfm_data *pdata, > + enum vdd_io_level level, > + unsigned int voltage_level) > +{ > + int ret = 0; > + int set_level; > + struct sdhci_msm_reg_data *vdd_io_reg = &pdata->vdd_io_data; > + > + if (vdd_io_reg && regulator_is_enabled(vdd_io_reg->reg)) { > + switch (level) { > + case VDD_IO_LOW: > + set_level = vdd_io_reg->low_vol_level; > + break; > + case VDD_IO_HIGH: > + set_level = vdd_io_reg->high_vol_level; > + break; > + case VDD_IO_SET_LEVEL: > + set_level = voltage_level; > + break; > + default: > + pr_err("%s: invalid argument level = %d", > + __func__, level); > + return -EINVAL; > + } > + ret = regulator_set_voltage(vdd_io_reg->reg, > + set_level, set_level); > + } > + > + return ret; > +} > + > +static irqreturn_t sdhci_msm_pwr_irq(int irq, void *data) > +{ > + struct sdhci_msm_host *msm_host = (struct sdhci_msm_host *)data; > + u8 irq_status = 0; > + u8 irq_ack = 0; > + int ret = 0; > + > + irq_status = readb_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS); > + pr_debug("%s: Received IRQ(%d), status=0x%x\n", > + mmc_hostname(msm_host->mmc), irq, irq_status); > + > + /* Clear the interrupt */ > + writeb_relaxed(irq_status, (msm_host->core_mem + CORE_PWRCTL_CLEAR)); > + /* > + * SDHC has core_mem and hc_mem device memory and these memory > + * addresses do not fall within 1KB region. Hence, any update to > + * core_mem address space would require an mb() to ensure this gets > + * completed before its next update to registers within hc_mem. > + */ > + mb(); > + > + /* Handle BUS ON/OFF */ > + if (irq_status & (CORE_PWRCTL_BUS_ON | CORE_PWRCTL_BUS_OFF)) { > + bool flag = (irq_status & CORE_PWRCTL_BUS_ON) ? 1 : 0; > + ret = sdhci_msm_setup_vreg(&msm_host->pdata, flag, false); > + if (ret) > + irq_ack |= CORE_PWRCTL_BUS_FAIL; > + else > + irq_ack |= CORE_PWRCTL_BUS_SUCCESS; > + } > + /* Handle IO LOW/HIGH */ > + if (irq_status & (CORE_PWRCTL_IO_LOW | CORE_PWRCTL_IO_HIGH)) { > + /* Switch voltage */ > + int io_status = (irq_status & CORE_PWRCTL_IO_LOW) ? > + VDD_IO_LOW : VDD_IO_HIGH; > + ret = sdhci_msm_set_vdd_io_vol(&msm_host->pdata, io_status, 0); > + if (ret) > + irq_ack |= CORE_PWRCTL_IO_FAIL; > + else > + irq_ack |= CORE_PWRCTL_IO_SUCCESS; > + } > + > + /* ACK status to the core */ > + writeb_relaxed(irq_ack, (msm_host->core_mem + CORE_PWRCTL_CTL)); > + /* > + * SDHC has core_mem and hc_mem device memory and these memory > + * addresses do not fall within 1KB region. Hence, any update to > + * core_mem address space would require an mb() to ensure this gets > + * completed before its next update to registers within hc_mem. > + */ > + mb(); > + > + pr_debug("%s: Handled IRQ(%d), ret=%d, ack=0x%x\n", > + mmc_hostname(msm_host->mmc), irq, ret, irq_ack); > + return IRQ_HANDLED; > +} > + > +/* This function returns the max. current supported by VDD rail in mA */ > +static u32 sdhci_msm_get_vdd_max_current(struct sdhci_msm_host *host) > +{ > + struct sdhci_msm_pltfm_data pdata = host->pdata; Probably I want to use pointer here. > + return pdata.vdd_data.hpm_uA / 1000; > +} > + > +static const struct of_device_id sdhci_msm_dt_match[] = { > + {.compatible = "qcom,sdhci-msm"}, > + {}, > +}; > + > +MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match); > + > +static int sdhci_msm_probe(struct platform_device *pdev) > +{ > + struct sdhci_host *host; > + struct sdhci_pltfm_host *pltfm_host; > + struct sdhci_msm_host *msm_host; > + struct resource *core_memres = NULL; > + int ret = 0, dead = 0; > + struct pinctrl *pinctrl; > + > + msm_host = devm_kzalloc(&pdev->dev, sizeof(*msm_host), GFP_KERNEL); > + if (!msm_host) > + return -ENOMEM; > + > + host = sdhci_pltfm_init(pdev, &msm_host->sdhci_msm_pdata, 0); > + if (IS_ERR(host)) { > + dev_err(mmc_dev(host->mmc), "sdhci_pltfm_init error\n"); > + return PTR_ERR(host); > + } > + > + pltfm_host = sdhci_priv(host); > + pltfm_host->priv = msm_host; > + msm_host->mmc = host->mmc; > + msm_host->pdev = pdev; > + > + ret = mmc_of_parse(host->mmc); > + if (ret) { > + dev_err(&pdev->dev, "failed parsing mmc device tree\n"); > + goto pltfm_free; > + } > + > + /* Extract platform data */ > + if (pdev->dev.of_node) { > + ret = sdhci_msm_populate_pdata(&pdev->dev, &msm_host->pdata); > + if (ret) { > + dev_err(&pdev->dev, "DT parsing error\n"); > + goto pltfm_free; > + } > + } else { > + dev_err(&pdev->dev, "No device tree node\n"); > + goto pltfm_free; > + } > + > + /* Setup pins */ > + pinctrl = devm_pinctrl_get_select_default(&pdev->dev); > + if (IS_ERR(pinctrl)) > + dev_warn(&pdev->dev, "pins are not configured by the driver\n"); > + > + /* Setup Clocks */ > + > + /* Setup SDCC bus voter clock. */ > + msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus"); > + if (!IS_ERR_OR_NULL(msm_host->bus_clk)) { Use only IS_ERR. > + /* Vote for max. clk rate for max. performance */ > + ret = clk_set_rate(msm_host->bus_clk, INT_MAX); > + if (ret) > + goto pltfm_free; > + ret = clk_prepare_enable(msm_host->bus_clk); > + if (ret) > + goto pltfm_free; > + } > + > + /* Setup main peripheral bus clock */ > + msm_host->pclk = devm_clk_get(&pdev->dev, "iface"); > + if (!IS_ERR(msm_host->pclk)) { > + ret = clk_prepare_enable(msm_host->pclk); > + if (ret) { > + dev_err(&pdev->dev, > + "Main peripheral clock setup failed (%d)\n", > + ret); > + goto bus_clk_disable; > + } > + } > + > + /* Setup SDC MMC clock */ > + msm_host->clk = devm_clk_get(&pdev->dev, "core"); > + if (IS_ERR(msm_host->clk)) { > + ret = PTR_ERR(msm_host->clk); > + dev_err(&pdev->dev, "SDC MMC clock setup failed (%d)\n", ret); > + goto pclk_disable; > + } > + > + ret = clk_prepare_enable(msm_host->clk); > + if (ret) > + goto pclk_disable; > + > + /* Setup regulators */ > + ret = sdhci_msm_vreg_init(&pdev->dev, &msm_host->pdata, true); > + if (ret) { > + dev_err(&pdev->dev, "Regulator setup failed (%d)\n", ret); > + goto clk_disable; > + } > + > + /* Reset the core and Enable SDHC mode */ > + core_memres = platform_get_resource_byname(pdev, > + IORESOURCE_MEM, "core_mem"); > + msm_host->core_mem = devm_ioremap(&pdev->dev, core_memres->start, > + resource_size(core_memres)); You could use devm_ioremap_resource() > + > + if (!msm_host->core_mem) { > + dev_err(&pdev->dev, "Failed to remap registers\n"); > + ret = -ENOMEM; > + goto vreg_deinit; > + } > + > + /* Set SW_RST bit in POWER register (Offset 0x0) */ > + writel_relaxed(CORE_SW_RST, msm_host->core_mem + CORE_POWER); > + /* Set HC_MODE_EN bit in HC_MODE register */ > + writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE)); > + > + /* > + * Following are the deviations from SDHC spec v3.0 - > + * 1. Card detection is handled using separate GPIO. > + * 2. Bus power control is handled by interacting with PMIC. > + */ > + host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; > + > + /* Setup PWRCTL irq */ > + msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq"); > + if (msm_host->pwr_irq < 0) { > + dev_err(&pdev->dev, "Failed to get pwr_irq by name (%d)\n", > + msm_host->pwr_irq); > + goto vreg_deinit; > + } > + ret = devm_request_threaded_irq(&pdev->dev, msm_host->pwr_irq, NULL, > + sdhci_msm_pwr_irq, IRQF_ONESHOT, > + dev_name(&pdev->dev), host); > + if (ret) { > + dev_err(&pdev->dev, "Request threaded irq(%d) failed (%d)\n", > + msm_host->pwr_irq, ret); > + goto vreg_deinit; > + } > + > + /* Enable pwr irq interrupts */ > + writel_relaxed(INT_MASK, (msm_host->core_mem + CORE_PWRCTL_MASK)); > + > + /* Set host capabilities */ > + msm_host->mmc->caps |= msm_host->pdata.caps; > + msm_host->mmc->caps2 |= msm_host->pdata.caps2; > + > + ret = sdhci_add_host(host); > + if (ret) { > + dev_err(&pdev->dev, "Add host failed (%d)\n", ret); > + goto vreg_deinit; > + } > + > + /* Set core clk rate */ > + ret = clk_set_rate(msm_host->clk, host->max_clk); > + if (ret) { > + dev_err(&pdev->dev, "MClk rate set failed (%d)\n", ret); > + goto remove_host; > + } > + > + host->mmc->max_current_180 = host->mmc->max_current_300 = > + host->mmc->max_current_330 = sdhci_msm_get_vdd_max_current(msm_host); > + > + /* Successful initialization */ > + goto out; return 0? > + > +remove_host: > + dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); > + sdhci_remove_host(host, dead); > +vreg_deinit: > + sdhci_msm_vreg_init(&pdev->dev, &msm_host->pdata, false); > +clk_disable: > + if (!IS_ERR(msm_host->clk)) > + clk_disable_unprepare(msm_host->clk); > +pclk_disable: > + if (!IS_ERR(msm_host->pclk)) > + clk_disable_unprepare(msm_host->pclk); > +bus_clk_disable: > + if (!IS_ERR_OR_NULL(msm_host->bus_clk)) Just IS_ERR. > + clk_disable_unprepare(msm_host->bus_clk); > +pltfm_free: > + sdhci_pltfm_free(pdev); > +out: > + return ret; > +} > + > +static int sdhci_msm_remove(struct platform_device *pdev) > +{ > + struct sdhci_host *host = platform_get_drvdata(pdev); > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_msm_host *msm_host = pltfm_host->priv; > + int dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == > + 0xffffffff); > + > + pr_debug("%s: %s\n", dev_name(&pdev->dev), __func__); > + sdhci_remove_host(host, dead); > + sdhci_pltfm_free(pdev); > + sdhci_msm_vreg_init(&pdev->dev, &msm_host->pdata, false); This is no longer required, right? But still regulators have to be disabled. > + clk_disable_unprepare(msm_host->clk); > + clk_disable_unprepare(msm_host->pclk); > + if (!IS_ERR_OR_NULL(msm_host->bus_clk)) Just IS_ERR. Thanks, Ivan > + clk_disable_unprepare(msm_host->bus_clk); > + return 0; > +} > + > +static struct platform_driver sdhci_msm_driver = { > + .probe = sdhci_msm_probe, > + .remove = sdhci_msm_remove, > + .driver = { > + .name = "sdhci_msm", > + .owner = THIS_MODULE, > + .of_match_table = sdhci_msm_dt_match, > + }, > +}; > + > +module_platform_driver(sdhci_msm_driver); > + > +MODULE_DESCRIPTION("Qualcomm Secure Digital Host Controller Interface driver"); > +MODULE_LICENSE("GPL v2"); -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt new file mode 100644 index 0000000..ee112da --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt @@ -0,0 +1,71 @@ +* Qualcomm SDHCI controller (sdhci-msm) + +This file documents differences between the core properties in mmc.txt +and the properties used by the sdhci-msm driver. + +Required properties: +- compatible: should be "qcom,sdhci-msm" +- reg: should contain SDHC, SD Core register map +- reg-names: indicates various resources passed to driver (via reg proptery) by name + "reg-names" examples are "hc_mem" and "core_mem" +- interrupts: should contain SDHC interrupts +- interrupt-names: indicates interrupts passed to driver (via interrupts property) by name + "interrupt-names" examples are "hc_irq" and "pwr_irq" +- <supply-name>-supply: phandle to the regulator device tree node + "supply-name" examples are "vdd" and "vdd-io" +- pinctrl-names: Should contain only one value - "default". +- pinctrl-0: Should specify pin control groups used for this controller. +- clocks: phandles to clock instances of the device tree nodes +- clock-names: + iface: Main peripheral bus clock (PCLK/HCLK - AHB Bus clock) (required) + core: SDC MMC clock (MCLK) (required) + bus: SDCC bus voter clock (optional) + +Optional properties: +- qcom,bus-speed-mode - specifies supported bus speed modes by host + The supported bus speed modes are : + "HS200_1p8v" - indicates that host can support HS200 at 1.8v + "HS200_1p2v" - indicates that host can support HS200 at 1.2v + "DDR_1p8v" - indicates that host can support DDR mode at 1.8v + "DDR_1p2v" - indicates that host can support DDR mode at 1.2v + +In the following, <supply> can be vdd (flash core voltage) or vdd-io (I/O voltage). +- qcom,<supply>-always-on - specifies whether supply should be kept "on" always. +- qcom,<supply>-lpm-sup - specifies whether supply can be kept in low power mode (lpm). +- qcom,<supply>-voltage-level - specifies voltage levels for supply. Should be +specified in pairs (min, max), units uV. +- qcom,<supply>-current-level - specifies load levels for supply in lpm or high power mode + (hpm). Should be specified in pairs (lpm, hpm), units uA. + +Example: + + aliases { + sdhc1 = &sdhc_1; + }; + + sdhc_1: qcom,sdhc@f9824900 { + compatible = "qcom,sdhci-msm"; + reg = <0xf9824900 0x11c>, <0xf9824000 0x800>; + reg-names = "hc_mem", "core_mem"; + interrupts = <0 123 0>, <0 138 0>; + interrupt-names = "hc_irq", "pwr_irq"; + bus-width = <4>; + non-removable; + + vdd-supply = <&pm8941_l21>; + vdd-io-supply = <&pm8941_l13>; + qcom,vdd-voltage-level = <2950000 2950000>; + qcom,vdd-current-level = <9000 800000>; + qcom,vdd-io-always-on; + qcom,vdd-io-lpm-sup; + qcom,vdd-io-voltage-level = <1800000 2950000>; + qcom,vdd-io-current-level = <6 22000>; + qcom,bus-speed-mode = "HS200_1p8v", "DDR_1p8v"; + + pinctrl-names = "default"; + pinctrl-0 = <&sdc1_clk &sdc1_cmd &sdc1_data>; + + clocks = <&iface>, <&core>, <&bus>; + clock-names = "iface", "core", "bus"; + + }; diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index b7fd5ab..b2a1fdb 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -322,6 +322,19 @@ config MMC_ATMELMCI If unsure, say N. +config MMC_SDHCI_MSM + tristate "Qualcomm SDHCI Controller Support" + depends on ARCH_MSM + depends on MMC_SDHCI_PLTFM + help + This selects the Secure Digital Host Controller Interface (SDHCI) + support present in MSM SOCs from Qualcomm. The controller + supports SD/MMC/SDIO devices. + + If you have a controller with this interface, say Y or M here. + + If unsure, say N. + config MMC_MSM tristate "Qualcomm SDCC Controller Support" depends on MMC && ARCH_MSM diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index c41d0c3..5faed14 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o obj-$(CONFIG_MMC_SDHCI_BCM2835) += sdhci-bcm2835.o +obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o ifeq ($(CONFIG_CB710_DEBUG),y) CFLAGS-cb710-mmc += -DDEBUG diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c new file mode 100644 index 0000000..904158d --- /dev/null +++ b/drivers/mmc/host/sdhci-msm.c @@ -0,0 +1,660 @@ +/* + * drivers/mmc/host/sdhci-msm.c - Qualcomm MSM SDHCI Platform + * driver source file + * + * Copyright (c) 2013, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> +#include <linux/regulator/consumer.h> + +#include "sdhci-pltfm.h" + +#define CORE_HC_MODE 0x78 +#define HC_MODE_EN 0x1 + +#define CORE_POWER 0x0 +#define CORE_SW_RST (1 << 7) + +#define CORE_PWRCTL_STATUS 0xdc +#define CORE_PWRCTL_MASK 0xe0 +#define CORE_PWRCTL_CLEAR 0xe4 +#define CORE_PWRCTL_CTL 0xe8 + +#define CORE_PWRCTL_BUS_OFF 0x01 +#define CORE_PWRCTL_BUS_ON (1 << 1) +#define CORE_PWRCTL_IO_LOW (1 << 2) +#define CORE_PWRCTL_IO_HIGH (1 << 3) + +#define CORE_PWRCTL_BUS_SUCCESS 0x01 +#define CORE_PWRCTL_BUS_FAIL (1 << 1) +#define CORE_PWRCTL_IO_SUCCESS (1 << 2) +#define CORE_PWRCTL_IO_FAIL (1 << 3) + +#define INT_MASK 0xf + +/* This structure keeps information per regulator */ +struct sdhci_msm_reg_data { + /* voltage regulator handle */ + struct regulator *reg; + /* regulator name */ + const char *name; + /* voltage level to be set */ + u32 low_vol_level; + u32 high_vol_level; + /* Load values for low power and high power mode */ + u32 lpm_uA; + u32 hpm_uA; + + /* is this regulator needs to be always on? */ + bool is_always_on; + /* is low power mode setting required for this regulator? */ + bool lpm_sup; +}; + +struct sdhci_msm_pltfm_data { + u32 caps; /* Supported UHS-I Modes */ + u32 caps2; /* More capabilities */ + struct sdhci_msm_reg_data vdd_data; /* VDD/VCC regulator info */ + struct sdhci_msm_reg_data vdd_io_data; /* VDD IO regulator info */ +}; + +struct sdhci_msm_host { + struct platform_device *pdev; + void __iomem *core_mem; /* MSM SDCC mapped address */ + int pwr_irq; /* power irq */ + struct clk *clk; /* main SD/MMC bus clock */ + struct clk *pclk; /* SDHC peripheral bus clock */ + struct clk *bus_clk; /* SDHC bus voter clock */ + struct sdhci_msm_pltfm_data pdata; + struct mmc_host *mmc; + struct sdhci_pltfm_data sdhci_msm_pdata; +}; + +enum vdd_io_level { + /* set vdd_io_data->low_vol_level */ + VDD_IO_LOW, + /* set vdd_io_data->high_vol_level */ + VDD_IO_HIGH, + /* + * set whatever there in voltage_level (third argument) of + * sdhci_msm_set_vdd_io_vol() function. + */ + VDD_IO_SET_LEVEL, +}; + +#define MAX_PROP_SIZE 32 +static int sdhci_msm_dt_parse_vreg_info(struct device *dev, + struct sdhci_msm_reg_data *vreg, + const char *vreg_name) +{ + int len, ret = 0; + const __be32 *prop; + char prop_name[MAX_PROP_SIZE]; + struct device_node *np = dev->of_node; + + snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", vreg_name); + if (!of_parse_phandle(np, prop_name, 0)) { + dev_info(dev, "No vreg data found for %s\n", vreg_name); + ret = -EINVAL; + return ret; + } + + if (!vreg) { + dev_err(dev, "invalid vreg: %s\n", vreg_name); + ret = -EINVAL; + return ret; + } + + vreg->name = vreg_name; + + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-always-on", vreg_name); + if (of_get_property(np, prop_name, NULL)) + vreg->is_always_on = true; + + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-lpm-sup", vreg_name); + if (of_get_property(np, prop_name, NULL)) + vreg->lpm_sup = true; + + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-voltage-level", vreg_name); + prop = of_get_property(np, prop_name, &len); + if (!prop || (len != (2 * sizeof(__be32)))) { + dev_warn(dev, "%s %s property\n", + prop ? "invalid format" : "no", prop_name); + } else { + vreg->low_vol_level = be32_to_cpup(&prop[0]); + vreg->high_vol_level = be32_to_cpup(&prop[1]); + } + + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-current-level", vreg_name); + prop = of_get_property(np, prop_name, &len); + if (!prop || (len != (2 * sizeof(__be32)))) { + dev_warn(dev, "%s %s property\n", + prop ? "invalid format" : "no", prop_name); + } else { + vreg->lpm_uA = be32_to_cpup(&prop[0]); + vreg->hpm_uA = be32_to_cpup(&prop[1]); + } + + dev_dbg(dev, "%s: %s %s vol=[%d %d]uV, curr=[%d %d]uA\n", + vreg->name, vreg->is_always_on ? "always_on," : "", + vreg->lpm_sup ? "lpm_sup," : "", vreg->low_vol_level, + vreg->high_vol_level, vreg->lpm_uA, vreg->hpm_uA); + + return ret; +} + +/* Parse platform data */ +static int sdhci_msm_populate_pdata(struct device *dev, + struct sdhci_msm_pltfm_data *pdata) +{ + struct device_node *np = dev->of_node; + int len, i; + + if (!pdata) { + dev_err(dev, "invalid platform data\n"); + return -EINVAL; + } + + if (sdhci_msm_dt_parse_vreg_info(dev, &pdata->vdd_data, "vdd")) { + dev_err(dev, "failed parsing vdd data\n"); + return -EINVAL; + } + if (sdhci_msm_dt_parse_vreg_info(dev, &pdata->vdd_io_data, "vdd-io")) { + dev_err(dev, "failed parsing vdd-io data\n"); + return -EINVAL; + } + + len = of_property_count_strings(np, "qcom,bus-speed-mode"); + + for (i = 0; i < len; i++) { + const char *name = NULL; + + of_property_read_string_index(np, + "qcom,bus-speed-mode", i, &name); + if (!name) + continue; + + if (!strncmp(name, "HS200_1p8v", sizeof("HS200_1p8v"))) + pdata->caps2 |= MMC_CAP2_HS200_1_8V_SDR; + else if (!strncmp(name, "HS200_1p2v", sizeof("HS200_1p2v"))) + pdata->caps2 |= MMC_CAP2_HS200_1_2V_SDR; + else if (!strncmp(name, "DDR_1p8v", sizeof("DDR_1p8v"))) + pdata->caps |= MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50; + else if (!strncmp(name, "DDR_1p2v", sizeof("DDR_1p2v"))) + pdata->caps |= MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50; + } + + return 0; +} + +/* Regulator utility functions */ +static int sdhci_msm_vreg_init_reg(struct device *dev, + struct sdhci_msm_reg_data *vreg) +{ + int ret = 0; + + /* check if regulator is already initialized? */ + if (!IS_ERR(vreg->reg)) + return ret; + + /* Get the regulator handle */ + vreg->reg = devm_regulator_get(dev, vreg->name); + if (IS_ERR(vreg->reg)) { + ret = PTR_ERR(vreg->reg); + dev_err(dev, "devm_regulator_get(%s) failed. ret=%d\n", + vreg->name, ret); + return ret; + } + + /* sanity check */ + if (!vreg->high_vol_level || !vreg->hpm_uA) { + dev_err(dev, "%s invalid constraints specified\n", vreg->name); + return -EINVAL; + } + + return ret; +} + +static int sdhci_msm_vreg_enable(struct sdhci_msm_reg_data *vreg) +{ + int ret = 0; + + /* Put regulator in HPM (high power mode) */ + ret = regulator_set_optimum_mode(vreg->reg, vreg->hpm_uA); + if (ret < 0) { + pr_err + ("%s: regulator_set_optimum_mode(%s,uA_load=%d) fail(%d)\n", + __func__, vreg->name, vreg->hpm_uA, ret); + return ret; + } + + if (!regulator_is_enabled(vreg->reg)) { + /* Set voltage level */ + ret = regulator_set_voltage(vreg->reg, vreg->high_vol_level, + vreg->high_vol_level); + if (ret) + return ret; + } + ret = regulator_enable(vreg->reg); + if (ret) { + pr_err("%s: regulator_enable(%s) failed. ret=%d\n", + __func__, vreg->name, ret); + return ret; + } + return ret; +} + +static int sdhci_msm_vreg_disable(struct sdhci_msm_reg_data *vreg) +{ + int ret = 0; + + /* Never disable regulator marked as always_on */ + if (regulator_is_enabled(vreg->reg) && !vreg->is_always_on) { + ret = regulator_disable(vreg->reg); + if (ret) { + pr_err("%s: regulator_disable(%s) failed. ret=%d\n", + __func__, vreg->name, ret); + return ret; + } + + ret = regulator_set_optimum_mode(vreg->reg, 0); + if (ret < 0) + return ret; + + /* Set min. voltage level to 0 */ + ret = regulator_set_voltage(vreg->reg, 0, vreg->high_vol_level); + if (ret) + return ret; + } else if (regulator_is_enabled(vreg->reg) && vreg->is_always_on) { + if (vreg->lpm_sup) { + /* Put always_on regulator in LPM (low power mode) */ + ret = regulator_set_optimum_mode(vreg->reg, + vreg->lpm_uA); + if (ret < 0) + return ret; + } + } + + return ret; +} + +static int sdhci_msm_setup_vreg(struct sdhci_msm_pltfm_data *pdata, + bool enable, bool is_init) +{ + int ret = 0, i; + struct sdhci_msm_reg_data *vreg_table[2]; + + vreg_table[0] = &pdata->vdd_data; + vreg_table[1] = &pdata->vdd_io_data; + + for (i = 0; i < ARRAY_SIZE(vreg_table); i++) { + if (vreg_table[i]) { + if (enable) + ret = sdhci_msm_vreg_enable(vreg_table[i]); + else + ret = sdhci_msm_vreg_disable(vreg_table[i]); + if (ret) + return ret; + } + } + return ret; +} + +/* This init function should be called only once for each SDHC slot */ +static int sdhci_msm_vreg_init(struct device *dev, + struct sdhci_msm_pltfm_data *pdata, bool is_init) +{ + int ret = 0; + struct sdhci_msm_reg_data *curr_vdd_reg, *curr_vdd_io_reg; + + curr_vdd_reg = &pdata->vdd_data; + curr_vdd_io_reg = &pdata->vdd_io_data; + + if (!is_init) + /* Deregister all regulators from regulator framework */ + return ret; + + /* + * Get the regulator handle from voltage regulator framework + * and then try to set the voltage level for the regulator + */ + if (curr_vdd_reg) { + ret = sdhci_msm_vreg_init_reg(dev, curr_vdd_reg); + if (ret) + return ret; + } + if (curr_vdd_io_reg) { + ret = sdhci_msm_vreg_init_reg(dev, curr_vdd_io_reg); + if (ret) + return ret; + } + + return ret; +} + +static int sdhci_msm_set_vdd_io_vol(struct sdhci_msm_pltfm_data *pdata, + enum vdd_io_level level, + unsigned int voltage_level) +{ + int ret = 0; + int set_level; + struct sdhci_msm_reg_data *vdd_io_reg = &pdata->vdd_io_data; + + if (vdd_io_reg && regulator_is_enabled(vdd_io_reg->reg)) { + switch (level) { + case VDD_IO_LOW: + set_level = vdd_io_reg->low_vol_level; + break; + case VDD_IO_HIGH: + set_level = vdd_io_reg->high_vol_level; + break; + case VDD_IO_SET_LEVEL: + set_level = voltage_level; + break; + default: + pr_err("%s: invalid argument level = %d", + __func__, level); + return -EINVAL; + } + ret = regulator_set_voltage(vdd_io_reg->reg, + set_level, set_level); + } + + return ret; +} + +static irqreturn_t sdhci_msm_pwr_irq(int irq, void *data) +{ + struct sdhci_msm_host *msm_host = (struct sdhci_msm_host *)data; + u8 irq_status = 0; + u8 irq_ack = 0; + int ret = 0; + + irq_status = readb_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS); + pr_debug("%s: Received IRQ(%d), status=0x%x\n", + mmc_hostname(msm_host->mmc), irq, irq_status); + + /* Clear the interrupt */ + writeb_relaxed(irq_status, (msm_host->core_mem + CORE_PWRCTL_CLEAR)); + /* + * SDHC has core_mem and hc_mem device memory and these memory + * addresses do not fall within 1KB region. Hence, any update to + * core_mem address space would require an mb() to ensure this gets + * completed before its next update to registers within hc_mem. + */ + mb(); + + /* Handle BUS ON/OFF */ + if (irq_status & (CORE_PWRCTL_BUS_ON | CORE_PWRCTL_BUS_OFF)) { + bool flag = (irq_status & CORE_PWRCTL_BUS_ON) ? 1 : 0; + ret = sdhci_msm_setup_vreg(&msm_host->pdata, flag, false); + if (ret) + irq_ack |= CORE_PWRCTL_BUS_FAIL; + else + irq_ack |= CORE_PWRCTL_BUS_SUCCESS; + } + /* Handle IO LOW/HIGH */ + if (irq_status & (CORE_PWRCTL_IO_LOW | CORE_PWRCTL_IO_HIGH)) { + /* Switch voltage */ + int io_status = (irq_status & CORE_PWRCTL_IO_LOW) ? + VDD_IO_LOW : VDD_IO_HIGH; + ret = sdhci_msm_set_vdd_io_vol(&msm_host->pdata, io_status, 0); + if (ret) + irq_ack |= CORE_PWRCTL_IO_FAIL; + else + irq_ack |= CORE_PWRCTL_IO_SUCCESS; + } + + /* ACK status to the core */ + writeb_relaxed(irq_ack, (msm_host->core_mem + CORE_PWRCTL_CTL)); + /* + * SDHC has core_mem and hc_mem device memory and these memory + * addresses do not fall within 1KB region. Hence, any update to + * core_mem address space would require an mb() to ensure this gets + * completed before its next update to registers within hc_mem. + */ + mb(); + + pr_debug("%s: Handled IRQ(%d), ret=%d, ack=0x%x\n", + mmc_hostname(msm_host->mmc), irq, ret, irq_ack); + return IRQ_HANDLED; +} + +/* This function returns the max. current supported by VDD rail in mA */ +static u32 sdhci_msm_get_vdd_max_current(struct sdhci_msm_host *host) +{ + struct sdhci_msm_pltfm_data pdata = host->pdata; + return pdata.vdd_data.hpm_uA / 1000; +} + +static const struct of_device_id sdhci_msm_dt_match[] = { + {.compatible = "qcom,sdhci-msm"}, + {}, +}; + +MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match); + +static int sdhci_msm_probe(struct platform_device *pdev) +{ + struct sdhci_host *host; + struct sdhci_pltfm_host *pltfm_host; + struct sdhci_msm_host *msm_host; + struct resource *core_memres = NULL; + int ret = 0, dead = 0; + struct pinctrl *pinctrl; + + msm_host = devm_kzalloc(&pdev->dev, sizeof(*msm_host), GFP_KERNEL); + if (!msm_host) + return -ENOMEM; + + host = sdhci_pltfm_init(pdev, &msm_host->sdhci_msm_pdata, 0); + if (IS_ERR(host)) { + dev_err(mmc_dev(host->mmc), "sdhci_pltfm_init error\n"); + return PTR_ERR(host); + } + + pltfm_host = sdhci_priv(host); + pltfm_host->priv = msm_host; + msm_host->mmc = host->mmc; + msm_host->pdev = pdev; + + ret = mmc_of_parse(host->mmc); + if (ret) { + dev_err(&pdev->dev, "failed parsing mmc device tree\n"); + goto pltfm_free; + } + + /* Extract platform data */ + if (pdev->dev.of_node) { + ret = sdhci_msm_populate_pdata(&pdev->dev, &msm_host->pdata); + if (ret) { + dev_err(&pdev->dev, "DT parsing error\n"); + goto pltfm_free; + } + } else { + dev_err(&pdev->dev, "No device tree node\n"); + goto pltfm_free; + } + + /* Setup pins */ + pinctrl = devm_pinctrl_get_select_default(&pdev->dev); + if (IS_ERR(pinctrl)) + dev_warn(&pdev->dev, "pins are not configured by the driver\n"); + + /* Setup Clocks */ + + /* Setup SDCC bus voter clock. */ + msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus"); + if (!IS_ERR_OR_NULL(msm_host->bus_clk)) { + /* Vote for max. clk rate for max. performance */ + ret = clk_set_rate(msm_host->bus_clk, INT_MAX); + if (ret) + goto pltfm_free; + ret = clk_prepare_enable(msm_host->bus_clk); + if (ret) + goto pltfm_free; + } + + /* Setup main peripheral bus clock */ + msm_host->pclk = devm_clk_get(&pdev->dev, "iface"); + if (!IS_ERR(msm_host->pclk)) { + ret = clk_prepare_enable(msm_host->pclk); + if (ret) { + dev_err(&pdev->dev, + "Main peripheral clock setup failed (%d)\n", + ret); + goto bus_clk_disable; + } + } + + /* Setup SDC MMC clock */ + msm_host->clk = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(msm_host->clk)) { + ret = PTR_ERR(msm_host->clk); + dev_err(&pdev->dev, "SDC MMC clock setup failed (%d)\n", ret); + goto pclk_disable; + } + + ret = clk_prepare_enable(msm_host->clk); + if (ret) + goto pclk_disable; + + /* Setup regulators */ + ret = sdhci_msm_vreg_init(&pdev->dev, &msm_host->pdata, true); + if (ret) { + dev_err(&pdev->dev, "Regulator setup failed (%d)\n", ret); + goto clk_disable; + } + + /* Reset the core and Enable SDHC mode */ + core_memres = platform_get_resource_byname(pdev, + IORESOURCE_MEM, "core_mem"); + msm_host->core_mem = devm_ioremap(&pdev->dev, core_memres->start, + resource_size(core_memres)); + + if (!msm_host->core_mem) { + dev_err(&pdev->dev, "Failed to remap registers\n"); + ret = -ENOMEM; + goto vreg_deinit; + } + + /* Set SW_RST bit in POWER register (Offset 0x0) */ + writel_relaxed(CORE_SW_RST, msm_host->core_mem + CORE_POWER); + /* Set HC_MODE_EN bit in HC_MODE register */ + writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE)); + + /* + * Following are the deviations from SDHC spec v3.0 - + * 1. Card detection is handled using separate GPIO. + * 2. Bus power control is handled by interacting with PMIC. + */ + host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; + + /* Setup PWRCTL irq */ + msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq"); + if (msm_host->pwr_irq < 0) { + dev_err(&pdev->dev, "Failed to get pwr_irq by name (%d)\n", + msm_host->pwr_irq); + goto vreg_deinit; + } + ret = devm_request_threaded_irq(&pdev->dev, msm_host->pwr_irq, NULL, + sdhci_msm_pwr_irq, IRQF_ONESHOT, + dev_name(&pdev->dev), host); + if (ret) { + dev_err(&pdev->dev, "Request threaded irq(%d) failed (%d)\n", + msm_host->pwr_irq, ret); + goto vreg_deinit; + } + + /* Enable pwr irq interrupts */ + writel_relaxed(INT_MASK, (msm_host->core_mem + CORE_PWRCTL_MASK)); + + /* Set host capabilities */ + msm_host->mmc->caps |= msm_host->pdata.caps; + msm_host->mmc->caps2 |= msm_host->pdata.caps2; + + ret = sdhci_add_host(host); + if (ret) { + dev_err(&pdev->dev, "Add host failed (%d)\n", ret); + goto vreg_deinit; + } + + /* Set core clk rate */ + ret = clk_set_rate(msm_host->clk, host->max_clk); + if (ret) { + dev_err(&pdev->dev, "MClk rate set failed (%d)\n", ret); + goto remove_host; + } + + host->mmc->max_current_180 = host->mmc->max_current_300 = + host->mmc->max_current_330 = sdhci_msm_get_vdd_max_current(msm_host); + + /* Successful initialization */ + goto out; + +remove_host: + dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); + sdhci_remove_host(host, dead); +vreg_deinit: + sdhci_msm_vreg_init(&pdev->dev, &msm_host->pdata, false); +clk_disable: + if (!IS_ERR(msm_host->clk)) + clk_disable_unprepare(msm_host->clk); +pclk_disable: + if (!IS_ERR(msm_host->pclk)) + clk_disable_unprepare(msm_host->pclk); +bus_clk_disable: + if (!IS_ERR_OR_NULL(msm_host->bus_clk)) + clk_disable_unprepare(msm_host->bus_clk); +pltfm_free: + sdhci_pltfm_free(pdev); +out: + return ret; +} + +static int sdhci_msm_remove(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_msm_host *msm_host = pltfm_host->priv; + int dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == + 0xffffffff); + + pr_debug("%s: %s\n", dev_name(&pdev->dev), __func__); + sdhci_remove_host(host, dead); + sdhci_pltfm_free(pdev); + sdhci_msm_vreg_init(&pdev->dev, &msm_host->pdata, false); + clk_disable_unprepare(msm_host->clk); + clk_disable_unprepare(msm_host->pclk); + if (!IS_ERR_OR_NULL(msm_host->bus_clk)) + clk_disable_unprepare(msm_host->bus_clk); + return 0; +} + +static struct platform_driver sdhci_msm_driver = { + .probe = sdhci_msm_probe, + .remove = sdhci_msm_remove, + .driver = { + .name = "sdhci_msm", + .owner = THIS_MODULE, + .of_match_table = sdhci_msm_dt_match, + }, +}; + +module_platform_driver(sdhci_msm_driver); + +MODULE_DESCRIPTION("Qualcomm Secure Digital Host Controller Interface driver"); +MODULE_LICENSE("GPL v2");
This platform driver adds the support of Secure Digital Host Controller Interface compliant controller found in Qualcomm MSM chipsets. CC: Asutosh Das <asutoshd@codeaurora.org> CC: Venkat Gopalakrishnan <venkatg@codeaurora.org> CC: Sahitya Tummala <stummala@codeaurora.org> CC: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Georgi Djakov <gdjakov@mm-sol.com> --- Changes from v3: - Allocate memory for all required structs at once - Added termination entry in sdhci_msm_dt_match[] - Fixed a missing sdhci_pltfm_free() in probe() - Removed redundant of_match_ptr - Removed the unneeded function sdhci_msm_vreg_reset() Changes from v2: - Added DT bindings for clocks - Moved voltage regulators data to platform data - Removed unneeded includes - Removed obsolete and wrapper functions - Removed error checking where unnecessary - Removed redundant _clk suffix from clock names - Just return instead of goto where possible - Minor fixes Changes from v1: - GPIO references are replaced by pinctrl - DT parsing is done mostly by mmc_of_parse() - Use of_match_device() for DT matching - A few minor changes .../devicetree/bindings/mmc/sdhci-msm.txt | 71 +++ drivers/mmc/host/Kconfig | 13 + drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-msm.c | 660 ++++++++++++++++++++ 4 files changed, 745 insertions(+) create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-msm.txt create mode 100644 drivers/mmc/host/sdhci-msm.c