676 lines
13 KiB
C
676 lines
13 KiB
C
#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/blkpg.h>
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#include <linux/hdreg.h>
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#include <linux/major.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#define DEVICE_NAME "mmc"
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#define DEVICE_NR(device) (MINOR(device))
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#define DEVICE_ON(device)
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#define DEVICE_OFF(device)
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#define MAJOR_NR 121
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#include <linux/blk.h>
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MODULE_AUTHOR("Madsuk/Rohde");
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MODULE_DESCRIPTION("Driver MMC/SD-Cards");
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MODULE_SUPPORTED_DEVICE("WRT54G");
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MODULE_LICENSE("GPL");
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#define SD_DI 0x20
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#define SD_DO 0x10
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#define SD_CLK 0x08
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#define SD_CS 0x80
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/* we have only one device */
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static int hd_sizes[1<<6];
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static int hd_blocksizes[1<<6];
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static int hd_hardsectsizes[1<<6];
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static int hd_maxsect[1<<6];
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static struct hd_struct hd[1<<6];
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static struct timer_list mmc_timer;
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static int mmc_media_detect = 0;
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static int mmc_media_changed = 1;
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typedef unsigned int uint32;
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static unsigned char port_state = 0x00;
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static volatile uint32 *gpioaddr_input = (uint32 *)0xb8000060;
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static volatile uint32 *gpioaddr_output = (uint32 *)0xb8000064;
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static volatile uint32 *gpioaddr_enable = (uint32 *)0xb8000068;
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static volatile uint32 *gpioaddr_control = (uint32 *)0xb800006c;
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static void mmc_spi_cs_low(void)
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{
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port_state &= ~(SD_CS);
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*gpioaddr_output = port_state;
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}
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static void mmc_spi_cs_high(void)
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{
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port_state |= SD_CS;
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*gpioaddr_output = port_state;
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}
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static unsigned char mmc_spi_io(unsigned char data_out)
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{
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int i;
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unsigned char result = 0, tmp_data = 0;
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for(i=0; i<8; i++) {
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if(data_out & (0x01 << (7-i)))
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port_state |= SD_DI;
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else
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port_state &= ~SD_DI;
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*gpioaddr_output = port_state;
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port_state |= SD_CLK;
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*gpioaddr_output = port_state;
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tmp_data = *gpioaddr_input;
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port_state &= ~SD_CLK;
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*gpioaddr_output = port_state;
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result <<= 1;
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if(tmp_data & SD_DO)
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result |= 1;
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}
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return(result);
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}
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static int mmc_write_block(unsigned int dest_addr, unsigned char *data)
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{
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unsigned int address;
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unsigned char r = 0;
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unsigned char ab0, ab1, ab2, ab3;
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int i;
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address = dest_addr;
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ab3 = 0xff & (address >> 24);
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ab2 = 0xff & (address >> 16);
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ab1 = 0xff & (address >> 8);
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ab0 = 0xff & address;
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mmc_spi_cs_low();
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for (i = 0; i < 4; i++) mmc_spi_io(0xff);
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mmc_spi_io(0x58);
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mmc_spi_io(ab3); /* msb */
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mmc_spi_io(ab2);
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mmc_spi_io(ab1);
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mmc_spi_io(ab0); /* lsb */
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mmc_spi_io(0xff);
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for (i = 0; i < 8; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0x00) break;
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}
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if (r != 0x00)
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{
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(1);
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}
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mmc_spi_io(0xfe);
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for (i = 0; i < 512; i++) mmc_spi_io(data[i]);
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for (i = 0; i < 2; i++) mmc_spi_io(0xff);
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for (i = 0; i < 1000000; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0xff) break;
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}
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if (r != 0xff)
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{
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(3);
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}
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(0);
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}
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static int mmc_read_block(unsigned char *data, unsigned int src_addr)
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{
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unsigned int address;
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unsigned char r = 0;
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unsigned char ab0, ab1, ab2, ab3;
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int i;
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address = src_addr;
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ab3 = 0xff & (address >> 24);
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ab2 = 0xff & (address >> 16);
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ab1 = 0xff & (address >> 8);
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ab0 = 0xff & address;
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mmc_spi_cs_low();
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for (i = 0; i < 4; i++) mmc_spi_io(0xff);
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mmc_spi_io(0x51);
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mmc_spi_io(ab3); /* msb */
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mmc_spi_io(ab2);
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mmc_spi_io(ab1);
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mmc_spi_io(ab0); /* lsb */
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mmc_spi_io(0xff);
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for (i = 0; i < 8; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0x00) break;
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}
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if (r != 0x00)
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{
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(1);
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}
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for (i = 0; i < 100000; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0xfe) break;
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}
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if (r != 0xfe)
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{
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(2);
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}
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for (i = 0; i < 512; i++)
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{
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r = mmc_spi_io(0xff);
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data[i] = r;
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}
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for (i = 0; i < 2; i++)
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{
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r = mmc_spi_io(0xff);
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}
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(0);
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}
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static void mmc_request(request_queue_t *q)
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{
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unsigned int mmc_address;
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unsigned char *buffer_address;
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int nr_sectors;
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int i;
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int cmd;
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int rc, code;
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(void)q;
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while (1)
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{
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code = 1; // Default is success
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INIT_REQUEST;
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mmc_address = (CURRENT->sector + hd[MINOR(CURRENT->rq_dev)].start_sect) * hd_hardsectsizes[0];
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buffer_address = CURRENT->buffer;
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nr_sectors = CURRENT->current_nr_sectors;
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cmd = CURRENT->cmd;
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if (((CURRENT->sector + CURRENT->current_nr_sectors + hd[MINOR(CURRENT->rq_dev)].start_sect) > hd[0].nr_sects) || (mmc_media_detect == 0))
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{
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code = 0;
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}
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else if (cmd == READ)
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{
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spin_unlock_irq(&io_request_lock);
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for (i = 0; i < nr_sectors; i++)
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{
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rc = mmc_read_block(buffer_address, mmc_address);
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if (rc != 0)
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{
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printk("mmc: error in mmc_read_block (%d)\n", rc);
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code = 0;
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break;
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}
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else
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{
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mmc_address += hd_hardsectsizes[0];
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buffer_address += hd_hardsectsizes[0];
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}
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}
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spin_lock_irq(&io_request_lock);
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}
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else if (cmd == WRITE)
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{
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spin_unlock_irq(&io_request_lock);
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for (i = 0; i < nr_sectors; i++)
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{
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rc = mmc_write_block(mmc_address, buffer_address);
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if (rc != 0)
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{
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printk("mmc: error in mmc_write_block (%d)\n", rc);
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code = 0;
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break;
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}
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else
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{
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mmc_address += hd_hardsectsizes[0];
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buffer_address += hd_hardsectsizes[0];
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}
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}
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spin_lock_irq(&io_request_lock);
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}
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else
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{
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code = 0;
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}
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end_request(code);
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}
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}
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static int mmc_open(struct inode *inode, struct file *filp)
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{
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int device;
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(void)filp;
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if (mmc_media_detect == 0) return -ENODEV;
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#if defined(MODULE)
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MOD_INC_USE_COUNT;
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#endif
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return 0;
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}
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static int mmc_release(struct inode *inode, struct file *filp)
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{
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(void)filp;
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fsync_dev(inode->i_rdev);
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invalidate_buffers(inode->i_rdev);
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#if defined(MODULE)
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MOD_DEC_USE_COUNT;
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#endif
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return 0;
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}
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extern struct gendisk hd_gendisk;
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static int mmc_revalidate(kdev_t dev)
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{
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int target, max_p, start, i;
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if (mmc_media_detect == 0) return -ENODEV;
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target = DEVICE_NR(dev);
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max_p = hd_gendisk.max_p;
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start = target << 6;
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for (i = max_p - 1; i >= 0; i--) {
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int minor = start + i;
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invalidate_device(MKDEV(MAJOR_NR, minor), 1);
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hd_gendisk.part[minor].start_sect = 0;
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hd_gendisk.part[minor].nr_sects = 0;
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}
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grok_partitions(&hd_gendisk, target, 1 << 6,
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hd_sizes[0] * 2);
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return 0;
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}
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static int mmc_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
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{
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if (!inode || !inode->i_rdev)
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return -EINVAL;
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switch(cmd) {
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case BLKGETSIZE:
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return put_user(hd[MINOR(inode->i_rdev)].nr_sects, (unsigned long *)arg);
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case BLKGETSIZE64:
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return put_user((u64)hd[MINOR(inode->i_rdev)].
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nr_sects, (u64 *) arg);
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case BLKRRPART:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return mmc_revalidate(inode->i_rdev);
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case HDIO_GETGEO:
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{
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struct hd_geometry *loc, g;
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loc = (struct hd_geometry *) arg;
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if (!loc)
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return -EINVAL;
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g.heads = 4;
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g.sectors = 16;
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g.cylinders = hd[0].nr_sects / (4 * 16);
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g.start = hd[MINOR(inode->i_rdev)].start_sect;
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return copy_to_user(loc, &g, sizeof(g)) ? -EFAULT : 0;
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}
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default:
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return blk_ioctl(inode->i_rdev, cmd, arg);
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}
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}
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static int mmc_card_init(void)
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{
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unsigned char r = 0;
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short i, j;
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unsigned long flags;
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save_flags(flags);
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cli();
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printk("mmc Card init\n");
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mmc_spi_cs_high();
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for (i = 0; i < 20; i++) mmc_spi_io(0xff);
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mmc_spi_cs_low();
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mmc_spi_io(0x40);
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for (i = 0; i < 4; i++) mmc_spi_io(0x00);
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mmc_spi_io(0x95);
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for (i = 0; i < 8; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0x01) break;
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}
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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if (r != 0x01)
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{
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restore_flags(flags);
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return(1);
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}
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printk("mmc Card init *1*\n");
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for (j = 0; j < 10000; j++)
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{
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mmc_spi_cs_low();
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mmc_spi_io(0x41);
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for (i = 0; i < 4; i++) mmc_spi_io(0x00);
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mmc_spi_io(0xff);
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for (i = 0; i < 8; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0x00) break;
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}
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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if (r == 0x00)
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{
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restore_flags(flags);
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printk("mmc Card init *2*\n");
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return(0);
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}
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}
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restore_flags(flags);
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return(2);
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}
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static int mmc_card_config(void)
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{
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unsigned char r = 0;
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short i;
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unsigned char csd[32];
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unsigned int c_size;
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unsigned int c_size_mult;
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unsigned int mult;
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unsigned int read_bl_len;
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unsigned int blocknr = 0;
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unsigned int block_len = 0;
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unsigned int size = 0;
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mmc_spi_cs_low();
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for (i = 0; i < 4; i++) mmc_spi_io(0xff);
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mmc_spi_io(0x49);
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for (i = 0; i < 4; i++) mmc_spi_io(0x00);
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mmc_spi_io(0xff);
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for (i = 0; i < 8; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0x00) break;
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}
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if (r != 0x00)
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{
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(1);
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}
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for (i = 0; i < 8; i++)
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{
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r = mmc_spi_io(0xff);
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if (r == 0xfe) break;
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}
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if (r != 0xfe)
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{
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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return(2);
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}
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for (i = 0; i < 16; i++)
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{
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r = mmc_spi_io(0xff);
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csd[i] = r;
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}
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for (i = 0; i < 2; i++)
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{
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r = mmc_spi_io(0xff);
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}
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mmc_spi_cs_high();
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mmc_spi_io(0xff);
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if (r == 0x00) return(3);
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c_size = csd[8] + csd[7] * 256 + (csd[6] & 0x03) * 256 * 256;
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c_size >>= 6;
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c_size_mult = csd[10] + (csd[9] & 0x03) * 256;
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c_size_mult >>= 7;
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read_bl_len = csd[5] & 0x0f;
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mult = 1;
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mult <<= c_size_mult + 2;
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blocknr = (c_size + 1) * mult;
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block_len = 1;
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block_len <<= read_bl_len;
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size = block_len * blocknr;
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size >>= 10;
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for(i=0; i<(1<<6); i++) {
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hd_blocksizes[i] = 1024;
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hd_hardsectsizes[i] = block_len;
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hd_maxsect[i] = 256;
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}
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hd_sizes[0] = size;
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hd[0].nr_sects = blocknr;
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printk("Size = %d, hardsectsize = %d, sectors = %d\n",
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size, block_len, blocknr);
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return 0;
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}
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static int mmc_hardware_init(void)
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{
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unsigned char gpio_outen;
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// Set inputs/outputs here
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printk("mmc Hardware init\n");
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gpio_outen = *gpioaddr_enable;
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gpio_outen = (gpio_outen | SD_DI | SD_CLK | SD_CS) & ~SD_DO;
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*gpioaddr_enable = gpio_outen;
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port_state = *gpioaddr_input;
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// Clock low
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port_state &= ~(SD_CLK | SD_DI | SD_CS);
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*gpioaddr_output = port_state;
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return 0;
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}
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static int mmc_check_media_change(kdev_t dev)
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{
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(void)dev;
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if (mmc_media_changed == 1)
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{
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mmc_media_changed = 0;
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return 1;
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}
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else return 0;
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}
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static struct block_device_operations mmc_bdops =
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{
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open: mmc_open,
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release: mmc_release,
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ioctl: mmc_ioctl,
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#if 0
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check_media_change: mmc_check_media_change,
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revalidate: mmc_revalidate,
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#endif
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};
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static struct gendisk hd_gendisk = {
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major: MAJOR_NR,
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major_name: DEVICE_NAME,
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minor_shift: 6,
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max_p: 1 << 6,
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part: hd,
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sizes: hd_sizes,
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fops: &mmc_bdops,
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};
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static int mmc_init(void)
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{
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int rc;
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rc = mmc_hardware_init();
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if ( rc != 0)
|
|
{
|
|
printk("mmc: error in mmc_hardware_init (%d)\n", rc);
|
|
return -1;
|
|
}
|
|
|
|
rc = mmc_card_init();
|
|
if ( rc != 0)
|
|
{
|
|
// Give it an extra shot
|
|
rc = mmc_card_init();
|
|
if ( rc != 0)
|
|
{
|
|
printk("mmc: error in mmc_card_init (%d)\n", rc);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
memset(hd_sizes, 0, sizeof(hd_sizes));
|
|
rc = mmc_card_config();
|
|
if ( rc != 0)
|
|
{
|
|
printk("mmc: error in mmc_card_config (%d)\n", rc);
|
|
return -1;
|
|
}
|
|
|
|
|
|
blk_size[MAJOR_NR] = hd_sizes;
|
|
|
|
memset(hd, 0, sizeof(hd));
|
|
hd[0].nr_sects = hd_sizes[0]*2;
|
|
|
|
blksize_size[MAJOR_NR] = hd_blocksizes;
|
|
hardsect_size[MAJOR_NR] = hd_hardsectsizes;
|
|
max_sectors[MAJOR_NR] = hd_maxsect;
|
|
|
|
hd_gendisk.nr_real = 1;
|
|
|
|
register_disk(&hd_gendisk, MKDEV(MAJOR_NR,0), 1<<6,
|
|
&mmc_bdops, hd_sizes[0]*2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mmc_exit(void)
|
|
{
|
|
blk_size[MAJOR_NR] = NULL;
|
|
blksize_size[MAJOR_NR] = NULL;
|
|
hardsect_size[MAJOR_NR] = NULL;
|
|
max_sectors[MAJOR_NR] = NULL;
|
|
hd[0].nr_sects = 0;
|
|
}
|
|
|
|
static void mmc_check_media(void)
|
|
{
|
|
int old_state;
|
|
int rc;
|
|
|
|
old_state = mmc_media_detect;
|
|
|
|
// TODO: Add card detection here
|
|
mmc_media_detect = 1;
|
|
if (old_state != mmc_media_detect)
|
|
{
|
|
mmc_media_changed = 1;
|
|
if (mmc_media_detect == 1)
|
|
{
|
|
rc = mmc_init();
|
|
if (rc != 0) printk("mmc: error in mmc_init (%d)\n", rc);
|
|
}
|
|
else
|
|
{
|
|
mmc_exit();
|
|
}
|
|
}
|
|
|
|
/* del_timer(&mmc_timer);
|
|
mmc_timer.expires = jiffies + 10*HZ;
|
|
add_timer(&mmc_timer); */
|
|
}
|
|
|
|
static int __init mmc_driver_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = devfs_register_blkdev(MAJOR_NR, DEVICE_NAME, &mmc_bdops);
|
|
if (rc < 0)
|
|
{
|
|
printk(KERN_WARNING "mmc: can't get major %d\n", MAJOR_NR);
|
|
return rc;
|
|
}
|
|
|
|
blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), mmc_request);
|
|
|
|
read_ahead[MAJOR_NR] = 8;
|
|
add_gendisk(&hd_gendisk);
|
|
|
|
mmc_check_media();
|
|
|
|
/*init_timer(&mmc_timer);
|
|
mmc_timer.expires = jiffies + HZ;
|
|
mmc_timer.function = (void *)mmc_check_media;
|
|
add_timer(&mmc_timer);*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit mmc_driver_exit(void)
|
|
{
|
|
int i;
|
|
del_timer(&mmc_timer);
|
|
|
|
for (i = 0; i < (1 << 6); i++)
|
|
fsync_dev(MKDEV(MAJOR_NR, i));
|
|
|
|
blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
|
|
del_gendisk(&hd_gendisk);
|
|
devfs_unregister_blkdev(MAJOR_NR, DEVICE_NAME);
|
|
mmc_exit();
|
|
}
|
|
|
|
module_init(mmc_driver_init);
|
|
module_exit(mmc_driver_exit);
|