diff options
Diffstat (limited to 'kernel/drivers/video/fbdev/broadsheetfb.c')
| -rw-r--r-- | kernel/drivers/video/fbdev/broadsheetfb.c | 1224 |
1 files changed, 1224 insertions, 0 deletions
diff --git a/kernel/drivers/video/fbdev/broadsheetfb.c b/kernel/drivers/video/fbdev/broadsheetfb.c new file mode 100644 index 000000000..0e5fde1d3 --- /dev/null +++ b/kernel/drivers/video/fbdev/broadsheetfb.c @@ -0,0 +1,1224 @@ +/* + * broadsheetfb.c -- FB driver for E-Ink Broadsheet controller + * + * Copyright (C) 2008, Jaya Kumar + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + * + * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. + * + * This driver is written to be used with the Broadsheet display controller. + * + * It is intended to be architecture independent. A board specific driver + * must be used to perform all the physical IO interactions. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/list.h> +#include <linux/firmware.h> +#include <linux/uaccess.h> + +#include <video/broadsheetfb.h> + +/* track panel specific parameters */ +struct panel_info { + int w; + int h; + u16 sdcfg; + u16 gdcfg; + u16 lutfmt; + u16 fsynclen; + u16 fendfbegin; + u16 lsynclen; + u16 lendlbegin; + u16 pixclk; +}; + +/* table of panel specific parameters to be indexed into by the board drivers */ +static struct panel_info panel_table[] = { + { /* standard 6" on TFT backplane */ + .w = 800, + .h = 600, + .sdcfg = (100 | (1 << 8) | (1 << 9)), + .gdcfg = 2, + .lutfmt = (4 | (1 << 7)), + .fsynclen = 4, + .fendfbegin = (10 << 8) | 4, + .lsynclen = 10, + .lendlbegin = (100 << 8) | 4, + .pixclk = 6, + }, + { /* custom 3.7" flexible on PET or steel */ + .w = 320, + .h = 240, + .sdcfg = (67 | (0 << 8) | (0 << 9) | (0 << 10) | (0 << 12)), + .gdcfg = 3, + .lutfmt = (4 | (1 << 7)), + .fsynclen = 0, + .fendfbegin = (80 << 8) | 4, + .lsynclen = 10, + .lendlbegin = (80 << 8) | 20, + .pixclk = 14, + }, + { /* standard 9.7" on TFT backplane */ + .w = 1200, + .h = 825, + .sdcfg = (100 | (1 << 8) | (1 << 9) | (0 << 10) | (0 << 12)), + .gdcfg = 2, + .lutfmt = (4 | (1 << 7)), + .fsynclen = 0, + .fendfbegin = (4 << 8) | 4, + .lsynclen = 4, + .lendlbegin = (60 << 8) | 10, + .pixclk = 3, + }, +}; + +#define DPY_W 800 +#define DPY_H 600 + +static struct fb_fix_screeninfo broadsheetfb_fix = { + .id = "broadsheetfb", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_STATIC_PSEUDOCOLOR, + .xpanstep = 0, + .ypanstep = 0, + .ywrapstep = 0, + .line_length = DPY_W, + .accel = FB_ACCEL_NONE, +}; + +static struct fb_var_screeninfo broadsheetfb_var = { + .xres = DPY_W, + .yres = DPY_H, + .xres_virtual = DPY_W, + .yres_virtual = DPY_H, + .bits_per_pixel = 8, + .grayscale = 1, + .red = { 0, 4, 0 }, + .green = { 0, 4, 0 }, + .blue = { 0, 4, 0 }, + .transp = { 0, 0, 0 }, +}; + +/* main broadsheetfb functions */ +static void broadsheet_gpio_issue_data(struct broadsheetfb_par *par, u16 data) +{ + par->board->set_ctl(par, BS_WR, 0); + par->board->set_hdb(par, data); + par->board->set_ctl(par, BS_WR, 1); +} + +static void broadsheet_gpio_issue_cmd(struct broadsheetfb_par *par, u16 data) +{ + par->board->set_ctl(par, BS_DC, 0); + broadsheet_gpio_issue_data(par, data); +} + +static void broadsheet_gpio_send_command(struct broadsheetfb_par *par, u16 data) +{ + par->board->wait_for_rdy(par); + + par->board->set_ctl(par, BS_CS, 0); + broadsheet_gpio_issue_cmd(par, data); + par->board->set_ctl(par, BS_DC, 1); + par->board->set_ctl(par, BS_CS, 1); +} + +static void broadsheet_gpio_send_cmdargs(struct broadsheetfb_par *par, u16 cmd, + int argc, u16 *argv) +{ + int i; + + par->board->wait_for_rdy(par); + + par->board->set_ctl(par, BS_CS, 0); + broadsheet_gpio_issue_cmd(par, cmd); + par->board->set_ctl(par, BS_DC, 1); + + for (i = 0; i < argc; i++) + broadsheet_gpio_issue_data(par, argv[i]); + par->board->set_ctl(par, BS_CS, 1); +} + +static void broadsheet_mmio_send_cmdargs(struct broadsheetfb_par *par, u16 cmd, + int argc, u16 *argv) +{ + int i; + + par->board->mmio_write(par, BS_MMIO_CMD, cmd); + + for (i = 0; i < argc; i++) + par->board->mmio_write(par, BS_MMIO_DATA, argv[i]); +} + +static void broadsheet_send_command(struct broadsheetfb_par *par, u16 data) +{ + if (par->board->mmio_write) + par->board->mmio_write(par, BS_MMIO_CMD, data); + else + broadsheet_gpio_send_command(par, data); +} + +static void broadsheet_send_cmdargs(struct broadsheetfb_par *par, u16 cmd, + int argc, u16 *argv) +{ + if (par->board->mmio_write) + broadsheet_mmio_send_cmdargs(par, cmd, argc, argv); + else + broadsheet_gpio_send_cmdargs(par, cmd, argc, argv); +} + +static void broadsheet_gpio_burst_write(struct broadsheetfb_par *par, int size, + u16 *data) +{ + int i; + u16 tmp; + + par->board->set_ctl(par, BS_CS, 0); + par->board->set_ctl(par, BS_DC, 1); + + for (i = 0; i < size; i++) { + par->board->set_ctl(par, BS_WR, 0); + tmp = (data[i] & 0x0F) << 4; + tmp |= (data[i] & 0x0F00) << 4; + par->board->set_hdb(par, tmp); + par->board->set_ctl(par, BS_WR, 1); + } + + par->board->set_ctl(par, BS_CS, 1); +} + +static void broadsheet_mmio_burst_write(struct broadsheetfb_par *par, int size, + u16 *data) +{ + int i; + u16 tmp; + + for (i = 0; i < size; i++) { + tmp = (data[i] & 0x0F) << 4; + tmp |= (data[i] & 0x0F00) << 4; + par->board->mmio_write(par, BS_MMIO_DATA, tmp); + } + +} + +static void broadsheet_burst_write(struct broadsheetfb_par *par, int size, + u16 *data) +{ + if (par->board->mmio_write) + broadsheet_mmio_burst_write(par, size, data); + else + broadsheet_gpio_burst_write(par, size, data); +} + +static u16 broadsheet_gpio_get_data(struct broadsheetfb_par *par) +{ + u16 res; + /* wait for ready to go hi. (lo is busy) */ + par->board->wait_for_rdy(par); + + /* cs lo, dc lo for cmd, we lo for each data, db as usual */ + par->board->set_ctl(par, BS_DC, 1); + par->board->set_ctl(par, BS_CS, 0); + par->board->set_ctl(par, BS_WR, 0); + + res = par->board->get_hdb(par); + + /* strobe wr */ + par->board->set_ctl(par, BS_WR, 1); + par->board->set_ctl(par, BS_CS, 1); + + return res; +} + + +static u16 broadsheet_get_data(struct broadsheetfb_par *par) +{ + if (par->board->mmio_read) + return par->board->mmio_read(par); + else + return broadsheet_gpio_get_data(par); +} + +static void broadsheet_gpio_write_reg(struct broadsheetfb_par *par, u16 reg, + u16 data) +{ + /* wait for ready to go hi. (lo is busy) */ + par->board->wait_for_rdy(par); + + /* cs lo, dc lo for cmd, we lo for each data, db as usual */ + par->board->set_ctl(par, BS_CS, 0); + + broadsheet_gpio_issue_cmd(par, BS_CMD_WR_REG); + + par->board->set_ctl(par, BS_DC, 1); + + broadsheet_gpio_issue_data(par, reg); + broadsheet_gpio_issue_data(par, data); + + par->board->set_ctl(par, BS_CS, 1); +} + +static void broadsheet_mmio_write_reg(struct broadsheetfb_par *par, u16 reg, + u16 data) +{ + par->board->mmio_write(par, BS_MMIO_CMD, BS_CMD_WR_REG); + par->board->mmio_write(par, BS_MMIO_DATA, reg); + par->board->mmio_write(par, BS_MMIO_DATA, data); + +} + +static void broadsheet_write_reg(struct broadsheetfb_par *par, u16 reg, + u16 data) +{ + if (par->board->mmio_write) + broadsheet_mmio_write_reg(par, reg, data); + else + broadsheet_gpio_write_reg(par, reg, data); +} + +static void broadsheet_write_reg32(struct broadsheetfb_par *par, u16 reg, + u32 data) +{ + broadsheet_write_reg(par, reg, cpu_to_le32(data) & 0xFFFF); + broadsheet_write_reg(par, reg + 2, (cpu_to_le32(data) >> 16) & 0xFFFF); +} + + +static u16 broadsheet_read_reg(struct broadsheetfb_par *par, u16 reg) +{ + broadsheet_send_cmdargs(par, BS_CMD_RD_REG, 1, ®); + par->board->wait_for_rdy(par); + return broadsheet_get_data(par); +} + +/* functions for waveform manipulation */ +static int is_broadsheet_pll_locked(struct broadsheetfb_par *par) +{ + return broadsheet_read_reg(par, 0x000A) & 0x0001; +} + +static int broadsheet_setup_plls(struct broadsheetfb_par *par) +{ + int retry_count = 0; + u16 tmp; + + /* disable arral saemipu mode */ + broadsheet_write_reg(par, 0x0006, 0x0000); + + broadsheet_write_reg(par, 0x0010, 0x0004); + broadsheet_write_reg(par, 0x0012, 0x5949); + broadsheet_write_reg(par, 0x0014, 0x0040); + broadsheet_write_reg(par, 0x0016, 0x0000); + + do { + if (retry_count++ > 100) + return -ETIMEDOUT; + mdelay(1); + } while (!is_broadsheet_pll_locked(par)); + + tmp = broadsheet_read_reg(par, 0x0006); + tmp &= ~0x1; + broadsheet_write_reg(par, 0x0006, tmp); + + return 0; +} + +static int broadsheet_setup_spi(struct broadsheetfb_par *par) +{ + + broadsheet_write_reg(par, 0x0204, ((3 << 3) | 1)); + broadsheet_write_reg(par, 0x0208, 0x0001); + + return 0; +} + +static int broadsheet_setup_spiflash(struct broadsheetfb_par *par, + u16 *orig_sfmcd) +{ + + *orig_sfmcd = broadsheet_read_reg(par, 0x0204); + broadsheet_write_reg(par, 0x0208, 0); + broadsheet_write_reg(par, 0x0204, 0); + broadsheet_write_reg(par, 0x0204, ((3 << 3) | 1)); + + return 0; +} + +static int broadsheet_spiflash_wait_for_bit(struct broadsheetfb_par *par, + u16 reg, int bitnum, int val, + int timeout) +{ + u16 tmp; + + do { + tmp = broadsheet_read_reg(par, reg); + if (((tmp >> bitnum) & 1) == val) + return 0; + mdelay(1); + } while (timeout--); + + return -ETIMEDOUT; +} + +static int broadsheet_spiflash_write_byte(struct broadsheetfb_par *par, u8 data) +{ + broadsheet_write_reg(par, 0x0202, (data | 0x100)); + + return broadsheet_spiflash_wait_for_bit(par, 0x0206, 3, 0, 100); +} + +static int broadsheet_spiflash_read_byte(struct broadsheetfb_par *par, u8 *data) +{ + int err; + u16 tmp; + + broadsheet_write_reg(par, 0x0202, 0); + + err = broadsheet_spiflash_wait_for_bit(par, 0x0206, 3, 0, 100); + if (err) + return err; + + tmp = broadsheet_read_reg(par, 0x200); + + *data = tmp & 0xFF; + + return 0; +} + +static int broadsheet_spiflash_wait_for_status(struct broadsheetfb_par *par, + int timeout) +{ + u8 tmp; + int err; + + do { + broadsheet_write_reg(par, 0x0208, 1); + + err = broadsheet_spiflash_write_byte(par, 0x05); + if (err) + goto failout; + + err = broadsheet_spiflash_read_byte(par, &tmp); + if (err) + goto failout; + + broadsheet_write_reg(par, 0x0208, 0); + + if (!(tmp & 0x1)) + return 0; + + mdelay(5); + } while (timeout--); + + dev_err(par->info->device, "Timed out waiting for spiflash status\n"); + return -ETIMEDOUT; + +failout: + broadsheet_write_reg(par, 0x0208, 0); + return err; +} + +static int broadsheet_spiflash_op_on_address(struct broadsheetfb_par *par, + u8 op, u32 addr) +{ + int i; + u8 tmp; + int err; + + broadsheet_write_reg(par, 0x0208, 1); + + err = broadsheet_spiflash_write_byte(par, op); + if (err) + return err; + + for (i = 2; i >= 0; i--) { + tmp = ((addr >> (i * 8)) & 0xFF); + err = broadsheet_spiflash_write_byte(par, tmp); + if (err) + return err; + } + + return err; +} + +static int broadsheet_verify_spiflash(struct broadsheetfb_par *par, + int *flash_type) +{ + int err = 0; + u8 sig; + + err = broadsheet_spiflash_op_on_address(par, 0xAB, 0x00000000); + if (err) + goto failout; + + err = broadsheet_spiflash_read_byte(par, &sig); + if (err) + goto failout; + + if ((sig != 0x10) && (sig != 0x11)) { + dev_err(par->info->device, "Unexpected flash type\n"); + err = -EINVAL; + goto failout; + } + + *flash_type = sig; + +failout: + broadsheet_write_reg(par, 0x0208, 0); + return err; +} + +static int broadsheet_setup_for_wfm_write(struct broadsheetfb_par *par, + u16 *initial_sfmcd, int *flash_type) + +{ + int err; + + err = broadsheet_setup_plls(par); + if (err) + return err; + + broadsheet_write_reg(par, 0x0106, 0x0203); + + err = broadsheet_setup_spi(par); + if (err) + return err; + + err = broadsheet_setup_spiflash(par, initial_sfmcd); + if (err) + return err; + + return broadsheet_verify_spiflash(par, flash_type); +} + +static int broadsheet_spiflash_write_control(struct broadsheetfb_par *par, + int mode) +{ + int err; + + broadsheet_write_reg(par, 0x0208, 1); + if (mode) + err = broadsheet_spiflash_write_byte(par, 0x06); + else + err = broadsheet_spiflash_write_byte(par, 0x04); + + broadsheet_write_reg(par, 0x0208, 0); + return err; +} + +static int broadsheet_spiflash_erase_sector(struct broadsheetfb_par *par, + int addr) +{ + int err; + + broadsheet_spiflash_write_control(par, 1); + + err = broadsheet_spiflash_op_on_address(par, 0xD8, addr); + + broadsheet_write_reg(par, 0x0208, 0); + + if (err) + return err; + + err = broadsheet_spiflash_wait_for_status(par, 1000); + + return err; +} + +static int broadsheet_spiflash_read_range(struct broadsheetfb_par *par, + int addr, int size, char *data) +{ + int err; + int i; + + err = broadsheet_spiflash_op_on_address(par, 0x03, addr); + if (err) + goto failout; + + for (i = 0; i < size; i++) { + err = broadsheet_spiflash_read_byte(par, &data[i]); + if (err) + goto failout; + } + +failout: + broadsheet_write_reg(par, 0x0208, 0); + return err; +} + +#define BS_SPIFLASH_PAGE_SIZE 256 +static int broadsheet_spiflash_write_page(struct broadsheetfb_par *par, + int addr, const char *data) +{ + int err; + int i; + + broadsheet_spiflash_write_control(par, 1); + + err = broadsheet_spiflash_op_on_address(par, 0x02, addr); + if (err) + goto failout; + + for (i = 0; i < BS_SPIFLASH_PAGE_SIZE; i++) { + err = broadsheet_spiflash_write_byte(par, data[i]); + if (err) + goto failout; + } + + broadsheet_write_reg(par, 0x0208, 0); + + err = broadsheet_spiflash_wait_for_status(par, 100); + +failout: + return err; +} + +static int broadsheet_spiflash_write_sector(struct broadsheetfb_par *par, + int addr, const char *data, int sector_size) +{ + int i; + int err; + + for (i = 0; i < sector_size; i += BS_SPIFLASH_PAGE_SIZE) { + err = broadsheet_spiflash_write_page(par, addr + i, &data[i]); + if (err) + return err; + } + return 0; +} + +/* + * The caller must guarantee that the data to be rewritten is entirely + * contained within this sector. That is, data_start_addr + data_len + * must be less than sector_start_addr + sector_size. + */ +static int broadsheet_spiflash_rewrite_sector(struct broadsheetfb_par *par, + int sector_size, int data_start_addr, + int data_len, const char *data) +{ + int err; + char *sector_buffer; + int tail_start_addr; + int start_sector_addr; + + sector_buffer = kzalloc(sizeof(char)*sector_size, GFP_KERNEL); + if (!sector_buffer) + return -ENOMEM; + + /* the start address of the sector is the 0th byte of that sector */ + start_sector_addr = (data_start_addr / sector_size) * sector_size; + + /* + * check if there is head data that we need to readback into our sector + * buffer first + */ + if (data_start_addr != start_sector_addr) { + /* + * we need to read every byte up till the start address of our + * data and we put it into our sector buffer. + */ + err = broadsheet_spiflash_read_range(par, start_sector_addr, + data_start_addr, sector_buffer); + if (err) + goto out; + } + + /* now we copy our data into the right place in the sector buffer */ + memcpy(sector_buffer + data_start_addr, data, data_len); + + /* + * now we check if there is a tail section of the sector that we need to + * readback. + */ + tail_start_addr = (data_start_addr + data_len) % sector_size; + + if (tail_start_addr) { + int tail_len; + + tail_len = sector_size - tail_start_addr; + + /* now we read this tail into our sector buffer */ + err = broadsheet_spiflash_read_range(par, tail_start_addr, + tail_len, sector_buffer + tail_start_addr); + if (err) + goto out; + } + + /* if we got here we have the full sector that we want to rewrite. */ + + /* first erase the sector */ + err = broadsheet_spiflash_erase_sector(par, start_sector_addr); + if (err) + goto out; + + /* now write it */ + err = broadsheet_spiflash_write_sector(par, start_sector_addr, + sector_buffer, sector_size); +out: + kfree(sector_buffer); + return err; +} + +static int broadsheet_write_spiflash(struct broadsheetfb_par *par, u32 wfm_addr, + const u8 *wfm, int bytecount, int flash_type) +{ + int sector_size; + int err; + int cur_addr; + int writecount; + int maxlen; + int offset = 0; + + switch (flash_type) { + case 0x10: + sector_size = 32*1024; + break; + case 0x11: + default: + sector_size = 64*1024; + break; + } + + while (bytecount) { + cur_addr = wfm_addr + offset; + maxlen = roundup(cur_addr, sector_size) - cur_addr; + writecount = min(bytecount, maxlen); + + err = broadsheet_spiflash_rewrite_sector(par, sector_size, + cur_addr, writecount, wfm + offset); + if (err) + return err; + + offset += writecount; + bytecount -= writecount; + } + + return 0; +} + +static int broadsheet_store_waveform_to_spiflash(struct broadsheetfb_par *par, + const u8 *wfm, size_t wfm_size) +{ + int err = 0; + u16 initial_sfmcd = 0; + int flash_type = 0; + + err = broadsheet_setup_for_wfm_write(par, &initial_sfmcd, &flash_type); + if (err) + goto failout; + + err = broadsheet_write_spiflash(par, 0x886, wfm, wfm_size, flash_type); + +failout: + broadsheet_write_reg(par, 0x0204, initial_sfmcd); + return err; +} + +static ssize_t broadsheet_loadstore_waveform(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + int err; + struct fb_info *info = dev_get_drvdata(dev); + struct broadsheetfb_par *par = info->par; + const struct firmware *fw_entry; + + if (len < 1) + return -EINVAL; + + err = request_firmware(&fw_entry, "broadsheet.wbf", dev); + if (err < 0) { + dev_err(dev, "Failed to get broadsheet waveform\n"); + goto err_failed; + } + + /* try to enforce reasonable min max on waveform */ + if ((fw_entry->size < 8*1024) || (fw_entry->size > 64*1024)) { + dev_err(dev, "Invalid waveform\n"); + err = -EINVAL; + goto err_failed; + } + + mutex_lock(&(par->io_lock)); + err = broadsheet_store_waveform_to_spiflash(par, fw_entry->data, + fw_entry->size); + + mutex_unlock(&(par->io_lock)); + if (err < 0) { + dev_err(dev, "Failed to store broadsheet waveform\n"); + goto err_failed; + } + + dev_info(dev, "Stored broadsheet waveform, size %zd\n", fw_entry->size); + + return len; + +err_failed: + return err; +} +static DEVICE_ATTR(loadstore_waveform, S_IWUSR, NULL, + broadsheet_loadstore_waveform); + +/* upper level functions that manipulate the display and other stuff */ +static void broadsheet_init_display(struct broadsheetfb_par *par) +{ + u16 args[5]; + int xres = par->info->var.xres; + int yres = par->info->var.yres; + + args[0] = panel_table[par->panel_index].w; + args[1] = panel_table[par->panel_index].h; + args[2] = panel_table[par->panel_index].sdcfg; + args[3] = panel_table[par->panel_index].gdcfg; + args[4] = panel_table[par->panel_index].lutfmt; + broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args); + + /* did the controller really set it? */ + broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args); + + args[0] = panel_table[par->panel_index].fsynclen; + args[1] = panel_table[par->panel_index].fendfbegin; + args[2] = panel_table[par->panel_index].lsynclen; + args[3] = panel_table[par->panel_index].lendlbegin; + args[4] = panel_table[par->panel_index].pixclk; + broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_TMG, 5, args); + + broadsheet_write_reg32(par, 0x310, xres*yres*2); + + /* setup waveform */ + args[0] = 0x886; + args[1] = 0; + broadsheet_send_cmdargs(par, BS_CMD_RD_WFM_INFO, 2, args); + + broadsheet_send_command(par, BS_CMD_UPD_GDRV_CLR); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_write_reg(par, 0x330, 0x84); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + args[0] = (0x3 << 4); + broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args); + + args[0] = 0x154; + broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args); + + broadsheet_burst_write(par, (panel_table[par->panel_index].w * + panel_table[par->panel_index].h)/2, + (u16 *) par->info->screen_base); + + broadsheet_send_command(par, BS_CMD_LD_IMG_END); + + args[0] = 0x4300; + broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND); + + par->board->wait_for_rdy(par); +} + +static void broadsheet_identify(struct broadsheetfb_par *par) +{ + u16 rev, prc; + struct device *dev = par->info->device; + + rev = broadsheet_read_reg(par, BS_REG_REV); + prc = broadsheet_read_reg(par, BS_REG_PRC); + dev_info(dev, "Broadsheet Rev 0x%x, Product Code 0x%x\n", rev, prc); + + if (prc != 0x0047) + dev_warn(dev, "Unrecognized Broadsheet Product Code\n"); + if (rev != 0x0100) + dev_warn(dev, "Unrecognized Broadsheet Revision\n"); +} + +static void broadsheet_init(struct broadsheetfb_par *par) +{ + broadsheet_send_command(par, BS_CMD_INIT_SYS_RUN); + /* the controller needs a second */ + msleep(1000); + broadsheet_init_display(par); +} + +static void broadsheetfb_dpy_update_pages(struct broadsheetfb_par *par, + u16 y1, u16 y2) +{ + u16 args[5]; + unsigned char *buf = (unsigned char *)par->info->screen_base; + + mutex_lock(&(par->io_lock)); + /* y1 must be a multiple of 4 so drop the lower bits */ + y1 &= 0xFFFC; + /* y2 must be a multiple of 4 , but - 1 so up the lower bits */ + y2 |= 0x0003; + + args[0] = 0x3 << 4; + args[1] = 0; + args[2] = y1; + args[3] = cpu_to_le16(par->info->var.xres); + args[4] = y2; + broadsheet_send_cmdargs(par, BS_CMD_LD_IMG_AREA, 5, args); + + args[0] = 0x154; + broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args); + + buf += y1 * par->info->var.xres; + broadsheet_burst_write(par, ((1 + y2 - y1) * par->info->var.xres)/2, + (u16 *) buf); + + broadsheet_send_command(par, BS_CMD_LD_IMG_END); + + args[0] = 0x4300; + broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND); + + par->board->wait_for_rdy(par); + mutex_unlock(&(par->io_lock)); + +} + +static void broadsheetfb_dpy_update(struct broadsheetfb_par *par) +{ + u16 args[5]; + + mutex_lock(&(par->io_lock)); + args[0] = 0x3 << 4; + broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args); + + args[0] = 0x154; + broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args); + broadsheet_burst_write(par, (panel_table[par->panel_index].w * + panel_table[par->panel_index].h)/2, + (u16 *) par->info->screen_base); + + broadsheet_send_command(par, BS_CMD_LD_IMG_END); + + args[0] = 0x4300; + broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG); + + broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND); + + par->board->wait_for_rdy(par); + mutex_unlock(&(par->io_lock)); +} + +/* this is called back from the deferred io workqueue */ +static void broadsheetfb_dpy_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ + u16 y1 = 0, h = 0; + int prev_index = -1; + struct page *cur; + struct fb_deferred_io *fbdefio = info->fbdefio; + int h_inc; + u16 yres = info->var.yres; + u16 xres = info->var.xres; + + /* height increment is fixed per page */ + h_inc = DIV_ROUND_UP(PAGE_SIZE , xres); + + /* walk the written page list and swizzle the data */ + list_for_each_entry(cur, &fbdefio->pagelist, lru) { + if (prev_index < 0) { + /* just starting so assign first page */ + y1 = (cur->index << PAGE_SHIFT) / xres; + h = h_inc; + } else if ((prev_index + 1) == cur->index) { + /* this page is consecutive so increase our height */ + h += h_inc; + } else { + /* page not consecutive, issue previous update first */ + broadsheetfb_dpy_update_pages(info->par, y1, y1 + h); + /* start over with our non consecutive page */ + y1 = (cur->index << PAGE_SHIFT) / xres; + h = h_inc; + } + prev_index = cur->index; + } + + /* if we still have any pages to update we do so now */ + if (h >= yres) { + /* its a full screen update, just do it */ + broadsheetfb_dpy_update(info->par); + } else { + broadsheetfb_dpy_update_pages(info->par, y1, + min((u16) (y1 + h), yres)); + } +} + +static void broadsheetfb_fillrect(struct fb_info *info, + const struct fb_fillrect *rect) +{ + struct broadsheetfb_par *par = info->par; + + sys_fillrect(info, rect); + + broadsheetfb_dpy_update(par); +} + +static void broadsheetfb_copyarea(struct fb_info *info, + const struct fb_copyarea *area) +{ + struct broadsheetfb_par *par = info->par; + + sys_copyarea(info, area); + + broadsheetfb_dpy_update(par); +} + +static void broadsheetfb_imageblit(struct fb_info *info, + const struct fb_image *image) +{ + struct broadsheetfb_par *par = info->par; + + sys_imageblit(info, image); + + broadsheetfb_dpy_update(par); +} + +/* + * this is the slow path from userspace. they can seek and write to + * the fb. it's inefficient to do anything less than a full screen draw + */ +static ssize_t broadsheetfb_write(struct fb_info *info, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct broadsheetfb_par *par = info->par; + unsigned long p = *ppos; + void *dst; + int err = 0; + unsigned long total_size; + + if (info->state != FBINFO_STATE_RUNNING) + return -EPERM; + + total_size = info->fix.smem_len; + + if (p > total_size) + return -EFBIG; + + if (count > total_size) { + err = -EFBIG; + count = total_size; + } + + if (count + p > total_size) { + if (!err) + err = -ENOSPC; + + count = total_size - p; + } + + dst = (void *)(info->screen_base + p); + + if (copy_from_user(dst, buf, count)) + err = -EFAULT; + + if (!err) + *ppos += count; + + broadsheetfb_dpy_update(par); + + return (err) ? err : count; +} + +static struct fb_ops broadsheetfb_ops = { + .owner = THIS_MODULE, + .fb_read = fb_sys_read, + .fb_write = broadsheetfb_write, + .fb_fillrect = broadsheetfb_fillrect, + .fb_copyarea = broadsheetfb_copyarea, + .fb_imageblit = broadsheetfb_imageblit, +}; + +static struct fb_deferred_io broadsheetfb_defio = { + .delay = HZ/4, + .deferred_io = broadsheetfb_dpy_deferred_io, +}; + +static int broadsheetfb_probe(struct platform_device *dev) +{ + struct fb_info *info; + struct broadsheet_board *board; + int retval = -ENOMEM; + int videomemorysize; + unsigned char *videomemory; + struct broadsheetfb_par *par; + int i; + int dpyw, dpyh; + int panel_index; + + /* pick up board specific routines */ + board = dev->dev.platform_data; + if (!board) + return -EINVAL; + + /* try to count device specific driver, if can't, platform recalls */ + if (!try_module_get(board->owner)) + return -ENODEV; + + info = framebuffer_alloc(sizeof(struct broadsheetfb_par), &dev->dev); + if (!info) + goto err; + + switch (board->get_panel_type()) { + case 37: + panel_index = 1; + break; + case 97: + panel_index = 2; + break; + case 6: + default: + panel_index = 0; + break; + } + + dpyw = panel_table[panel_index].w; + dpyh = panel_table[panel_index].h; + + videomemorysize = roundup((dpyw*dpyh), PAGE_SIZE); + + videomemory = vzalloc(videomemorysize); + if (!videomemory) + goto err_fb_rel; + + info->screen_base = (char *)videomemory; + info->fbops = &broadsheetfb_ops; + + broadsheetfb_var.xres = dpyw; + broadsheetfb_var.yres = dpyh; + broadsheetfb_var.xres_virtual = dpyw; + broadsheetfb_var.yres_virtual = dpyh; + info->var = broadsheetfb_var; + + broadsheetfb_fix.line_length = dpyw; + info->fix = broadsheetfb_fix; + info->fix.smem_len = videomemorysize; + par = info->par; + par->panel_index = panel_index; + par->info = info; + par->board = board; + par->write_reg = broadsheet_write_reg; + par->read_reg = broadsheet_read_reg; + init_waitqueue_head(&par->waitq); + + mutex_init(&par->io_lock); + + info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB; + + info->fbdefio = &broadsheetfb_defio; + fb_deferred_io_init(info); + + retval = fb_alloc_cmap(&info->cmap, 16, 0); + if (retval < 0) { + dev_err(&dev->dev, "Failed to allocate colormap\n"); + goto err_vfree; + } + + /* set cmap */ + for (i = 0; i < 16; i++) + info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/32; + memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*16); + memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*16); + + retval = par->board->setup_irq(info); + if (retval < 0) + goto err_cmap; + + /* this inits the dpy */ + retval = board->init(par); + if (retval < 0) + goto err_free_irq; + + broadsheet_identify(par); + + broadsheet_init(par); + + retval = register_framebuffer(info); + if (retval < 0) + goto err_free_irq; + + platform_set_drvdata(dev, info); + + retval = device_create_file(&dev->dev, &dev_attr_loadstore_waveform); + if (retval < 0) + goto err_unreg_fb; + + fb_info(info, "Broadsheet frame buffer, using %dK of video memory\n", + videomemorysize >> 10); + + + return 0; + +err_unreg_fb: + unregister_framebuffer(info); +err_free_irq: + board->cleanup(par); +err_cmap: + fb_dealloc_cmap(&info->cmap); +err_vfree: + vfree(videomemory); +err_fb_rel: + framebuffer_release(info); +err: + module_put(board->owner); + return retval; + +} + +static int broadsheetfb_remove(struct platform_device *dev) +{ + struct fb_info *info = platform_get_drvdata(dev); + + if (info) { + struct broadsheetfb_par *par = info->par; + + device_remove_file(info->dev, &dev_attr_loadstore_waveform); + unregister_framebuffer(info); + fb_deferred_io_cleanup(info); + par->board->cleanup(par); + fb_dealloc_cmap(&info->cmap); + vfree((void *)info->screen_base); + module_put(par->board->owner); + framebuffer_release(info); + } + return 0; +} + +static struct platform_driver broadsheetfb_driver = { + .probe = broadsheetfb_probe, + .remove = broadsheetfb_remove, + .driver = { + .name = "broadsheetfb", + }, +}; +module_platform_driver(broadsheetfb_driver); + +MODULE_DESCRIPTION("fbdev driver for Broadsheet controller"); +MODULE_AUTHOR("Jaya Kumar"); +MODULE_LICENSE("GPL"); |