atmel-mci: Platform code for supporting multiple mmc slots
Add the necessary platform infrastructure to support multiple mmc/sdcard slots all at once through a single controller. Currently, the driver will use the first valid slot it finds and stick with that, but later patches will add support for switching between several slots on the fly. Extend the platform data structure with per-slot information: MMC/SDcard bus width and card detect/write protect pins. This will affect the pin muxing as well as the capabilities announced to the mmc core. Note that board code is now required to supply a mci_platform_data struct to at32_add_device_mci(). Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
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945533b538
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6b918657b7
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@ -53,8 +53,11 @@ static struct spi_board_info spi0_board_info[] __initdata = {
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};
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static struct mci_platform_data __initdata mci0_data = {
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.detect_pin = GPIO_PIN_PC(25),
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.wp_pin = GPIO_PIN_PE(0),
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.slot[0] = {
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.bus_width = 4,
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.detect_pin = GPIO_PIN_PC(25),
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.wp_pin = GPIO_PIN_PE(0),
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},
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};
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/*
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@ -264,16 +264,20 @@ void __init setup_board(void)
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#ifndef CONFIG_BOARD_ATSTK100X_SW2_CUSTOM
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static struct mci_platform_data __initdata mci0_data = {
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.slot[0] = {
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.bus_width = 4,
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/* MMC card detect requires MACB0 *NOT* be used */
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#ifdef CONFIG_BOARD_ATSTK1002_SW6_CUSTOM
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static struct mci_platform_data __initdata mci0_data = {
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.detect_pin = GPIO_PIN_PC(14), /* gpio30/sdcd */
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.wp_pin = GPIO_PIN_PC(15), /* gpio31/sdwp */
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};
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#define MCI_PDATA &mci0_data
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.detect_pin = GPIO_PIN_PC(14), /* gpio30/sdcd */
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.wp_pin = GPIO_PIN_PC(15), /* gpio31/sdwp */
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#else
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#define MCI_PDATA NULL
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.detect_pin = -ENODEV,
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.wp_pin = -ENODEV,
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#endif /* SW6 for sd{cd,wp} routing */
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},
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};
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#endif /* SW2 for MMC signal routing */
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@ -326,7 +330,7 @@ static int __init atstk1002_init(void)
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at32_add_device_spi(1, spi1_board_info, ARRAY_SIZE(spi1_board_info));
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#endif
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#ifndef CONFIG_BOARD_ATSTK100X_SW2_CUSTOM
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at32_add_device_mci(0, MCI_PDATA);
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at32_add_device_mci(0, &mci0_pdata);
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#endif
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#ifdef CONFIG_BOARD_ATSTK1002_SW5_CUSTOM
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set_hw_addr(at32_add_device_eth(1, ð_data[1]));
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@ -66,6 +66,16 @@ static struct spi_board_info spi1_board_info[] __initdata = { {
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} };
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#endif
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#ifndef CONFIG_BOARD_ATSTK100X_SW2_CUSTOM
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static struct mci_platform_data __initdata mci0_data = {
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.slot[0] = {
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.bus_width = 4,
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.detect_pin = -ENODEV,
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.wp_pin = -ENODEV,
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},
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};
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#endif
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#ifdef CONFIG_BOARD_ATSTK1000_EXTDAC
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static void __init atstk1003_setup_extdac(void)
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{
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@ -154,7 +164,7 @@ static int __init atstk1003_init(void)
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at32_add_device_spi(1, spi1_board_info, ARRAY_SIZE(spi1_board_info));
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#endif
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#ifndef CONFIG_BOARD_ATSTK100X_SW2_CUSTOM
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at32_add_device_mci(0, NULL);
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at32_add_device_mci(0, &mci0_data);
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#endif
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at32_add_device_usba(0, NULL);
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#ifndef CONFIG_BOARD_ATSTK100X_SW3_CUSTOM
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@ -71,6 +71,16 @@ static struct spi_board_info spi1_board_info[] __initdata = { {
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} };
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#endif
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#ifndef CONFIG_BOARD_ATSTK100X_SW2_CUSTOM
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static struct mci_platform_data __initdata mci0_data = {
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.slot[0] = {
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.bus_width = 4,
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.detect_pin = -ENODEV,
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.wp_pin = -ENODEV,
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},
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};
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#endif
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#ifdef CONFIG_BOARD_ATSTK1000_EXTDAC
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static void __init atstk1004_setup_extdac(void)
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{
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@ -137,7 +147,7 @@ static int __init atstk1004_init(void)
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at32_add_device_spi(1, spi1_board_info, ARRAY_SIZE(spi1_board_info));
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#endif
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#ifndef CONFIG_BOARD_ATSTK100X_SW2_CUSTOM
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at32_add_device_mci(0, NULL);
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at32_add_device_mci(0, &mci0_data);
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#endif
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at32_add_device_lcdc(0, &atstk1000_lcdc_data,
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fbmem_start, fbmem_size, 0);
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@ -1,9 +1,29 @@
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#ifndef __ASM_AVR32_ATMEL_MCI_H
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#define __ASM_AVR32_ATMEL_MCI_H
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struct mci_platform_data {
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/**
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* struct mci_slot_pdata - board-specific per-slot configuration
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* @bus_width: Number of data lines wired up the slot
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* @detect_pin: GPIO pin wired to the card detect switch
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* @wp_pin: GPIO pin wired to the write protect sensor
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*
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* If a given slot is not present on the board, @bus_width should be
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* set to 0. The other fields are ignored in this case.
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*
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* Any pins that aren't available should be set to a negative value.
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*/
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struct mci_slot_pdata {
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unsigned int bus_width;
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int detect_pin;
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int wp_pin;
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};
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/**
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* struct mci_platform_data - board-specific MMC/SDcard configuration
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* @slot: Per-slot configuration data.
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*/
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struct mci_platform_data {
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struct mci_slot_pdata slot[2];
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};
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#endif /* __ASM_AVR32_ATMEL_MCI_H */
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@ -1272,10 +1272,13 @@ static struct clk atmel_mci0_pclk = {
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struct platform_device *__init
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at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
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{
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struct mci_platform_data _data;
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struct platform_device *pdev;
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if (id != 0)
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if (id != 0 || !data)
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return NULL;
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/* Must have at least one usable slot */
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if (!data->slot[0].bus_width && !data->slot[1].bus_width)
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return NULL;
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pdev = platform_device_alloc("atmel_mci", id);
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@ -1286,28 +1289,61 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
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ARRAY_SIZE(atmel_mci0_resource)))
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goto fail;
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if (!data) {
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data = &_data;
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memset(data, -1, sizeof(struct mci_platform_data));
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data->detect_pin = GPIO_PIN_NONE;
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data->wp_pin = GPIO_PIN_NONE;
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}
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if (platform_device_add_data(pdev, data,
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sizeof(struct mci_platform_data)))
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goto fail;
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select_peripheral(PA(10), PERIPH_A, 0); /* CLK */
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select_peripheral(PA(11), PERIPH_A, 0); /* CMD */
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select_peripheral(PA(12), PERIPH_A, 0); /* DATA0 */
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select_peripheral(PA(13), PERIPH_A, 0); /* DATA1 */
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select_peripheral(PA(14), PERIPH_A, 0); /* DATA2 */
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select_peripheral(PA(15), PERIPH_A, 0); /* DATA3 */
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/* CLK line is common to both slots */
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select_peripheral(PA(10), PERIPH_A, 0);
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if (gpio_is_valid(data->detect_pin))
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at32_select_gpio(data->detect_pin, 0);
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if (gpio_is_valid(data->wp_pin))
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at32_select_gpio(data->wp_pin, 0);
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switch (data->slot[0].bus_width) {
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case 4:
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select_peripheral(PA(13), PERIPH_A, 0); /* DATA1 */
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select_peripheral(PA(14), PERIPH_A, 0); /* DATA2 */
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select_peripheral(PA(15), PERIPH_A, 0); /* DATA3 */
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/* fall through */
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case 1:
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select_peripheral(PA(11), PERIPH_A, 0); /* CMD */
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select_peripheral(PA(12), PERIPH_A, 0); /* DATA0 */
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if (gpio_is_valid(data->slot[0].detect_pin))
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at32_select_gpio(data->slot[0].detect_pin, 0);
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if (gpio_is_valid(data->slot[0].wp_pin))
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at32_select_gpio(data->slot[0].wp_pin, 0);
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break;
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case 0:
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/* Slot is unused */
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break;
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default:
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goto fail;
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}
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switch (data->slot[1].bus_width) {
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case 4:
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select_peripheral(PB(8), PERIPH_B, 0); /* DATA1 */
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select_peripheral(PB(9), PERIPH_B, 0); /* DATA2 */
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select_peripheral(PB(10), PERIPH_B, 0); /* DATA3 */
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/* fall through */
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case 1:
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select_peripheral(PB(6), PERIPH_B, 0); /* CMD */
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select_peripheral(PB(7), PERIPH_B, 0); /* DATA0 */
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if (gpio_is_valid(data->slot[1].detect_pin))
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at32_select_gpio(data->slot[1].detect_pin, 0);
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if (gpio_is_valid(data->slot[1].wp_pin))
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at32_select_gpio(data->slot[1].wp_pin, 0);
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break;
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case 0:
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/* Slot is unused */
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break;
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default:
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if (!data->slot[0].bus_width)
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goto fail;
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data->slot[1].bus_width = 0;
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break;
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}
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atmel_mci0_pclk.dev = &pdev->dev;
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@ -25,8 +25,10 @@
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#define MCI_SDCR 0x000c /* SD Card / SDIO */
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# define MCI_SDCSEL_SLOT_A ( 0 << 0) /* Select SD slot A */
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# define MCI_SDCSEL_SLOT_B ( 1 << 0) /* Select SD slot A */
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# define MCI_SDCBUS_1BIT ( 0 << 7) /* 1-bit data bus */
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# define MCI_SDCBUS_4BIT ( 1 << 7) /* 4-bit data bus */
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# define MCI_SDCSEL_MASK ( 3 << 0)
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# define MCI_SDCBUS_1BIT ( 0 << 6) /* 1-bit data bus */
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# define MCI_SDCBUS_4BIT ( 2 << 6) /* 4-bit data bus */
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# define MCI_SDCBUS_MASK ( 3 << 6)
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#define MCI_ARGR 0x0010 /* Command Argument */
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#define MCI_CMDR 0x0014 /* Command */
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# define MCI_CMDR_CMDNB(x) ((x) << 0) /* Command Opcode */
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@ -508,9 +508,10 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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struct atmel_mci *host = mmc_priv(mmc);
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host->sdc_reg &= ~MCI_SDCBUS_MASK;
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switch (ios->bus_width) {
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case MMC_BUS_WIDTH_1:
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host->sdc_reg = 0;
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host->sdc_reg |= MCI_SDCBUS_1BIT;
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break;
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case MMC_BUS_WIDTH_4:
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host->sdc_reg = MCI_SDCBUS_4BIT;
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@ -1014,9 +1015,11 @@ static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
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static int __init atmci_probe(struct platform_device *pdev)
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{
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struct mci_platform_data *pdata;
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struct mci_slot_pdata *slot;
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struct atmel_mci *host;
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struct mmc_host *mmc;
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struct resource *regs;
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u32 sdc_reg;
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int irq;
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int ret;
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@ -1030,6 +1033,17 @@ static int __init atmci_probe(struct platform_device *pdev)
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if (irq < 0)
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return irq;
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/* TODO: Allow using several slots at once */
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if (pdata->slot[0].bus_width) {
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sdc_reg = MCI_SDCSEL_SLOT_A;
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slot = &pdata->slot[0];
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} else if (pdata->slot[1].bus_width) {
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sdc_reg = MCI_SDCSEL_SLOT_B;
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slot = &pdata->slot[1];
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} else {
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return -EINVAL;
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}
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mmc = mmc_alloc_host(sizeof(struct atmel_mci), &pdev->dev);
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if (!mmc)
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return -ENOMEM;
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@ -1037,8 +1051,9 @@ static int __init atmci_probe(struct platform_device *pdev)
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host = mmc_priv(mmc);
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host->pdev = pdev;
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host->mmc = mmc;
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host->detect_pin = pdata->detect_pin;
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host->wp_pin = pdata->wp_pin;
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host->detect_pin = slot->detect_pin;
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host->wp_pin = slot->wp_pin;
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host->sdc_reg = sdc_reg;
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host->mck = clk_get(&pdev->dev, "mci_clk");
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if (IS_ERR(host->mck)) {
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mmc->f_min = (host->bus_hz + 511) / 512;
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mmc->f_max = host->bus_hz / 2;
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mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
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mmc->caps |= MMC_CAP_4_BIT_DATA;
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if (slot->bus_width >= 4)
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mmc->caps |= MMC_CAP_4_BIT_DATA;
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mmc->max_hw_segs = 64;
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mmc->max_phys_segs = 64;
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